22 | * Call this whenever the background of a translucent Activity has changed
23 | * to become opaque. Doing so will allow the {@link android.view.Surface} of
24 | * the Activity behind to be released.
25 | *
26 | * This call has no effect on non-translucent activities or on activities
27 | * with the {@link android.R.attr#windowIsFloating} attribute.
28 | */
29 | public static void convertActivityFromTranslucent(Activity activity) {
30 | try {
31 | Method method = Activity.class.getDeclaredMethod("convertFromTranslucent");
32 | method.setAccessible(true);
33 | method.invoke(activity);
34 | } catch (Throwable t) {
35 | }
36 | }
37 |
38 | /**
39 | * Convert a translucent themed Activity
40 | * {@link android.R.attr#windowIsTranslucent} back from opaque to
41 | * translucent following a call to
42 | * {@link #convertActivityFromTranslucent(android.app.Activity)} .
43 | *
44 | * Calling this allows the Activity behind this one to be seen again. Once
45 | * all such Activities have been redrawn
46 | *
47 | * This call has no effect on non-translucent activities or on activities
48 | * with the {@link android.R.attr#windowIsFloating} attribute.
49 | */
50 | public static void convertActivityToTranslucent(Activity activity) {
51 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
52 | convertActivityToTranslucentAfterL(activity);
53 | } else {
54 | convertActivityToTranslucentBeforeL(activity);
55 | }
56 | }
57 |
58 | /**
59 | * Calling the convertToTranslucent method on platforms before Android 5.0
60 | */
61 | public static void convertActivityToTranslucentBeforeL(Activity activity) {
62 | try {
63 | Class[] classes = Activity.class.getDeclaredClasses();
64 | Class translucentConversionListenerClazz = null;
65 | for (Class clazz : classes) {
66 | if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
67 | translucentConversionListenerClazz = clazz;
68 | }
69 | }
70 | Method method = Activity.class.getDeclaredMethod("convertToTranslucent",
71 | translucentConversionListenerClazz);
72 | method.setAccessible(true);
73 | method.invoke(activity, new Object[] {
74 | null
75 | });
76 | } catch (Throwable t) {
77 | }
78 | }
79 |
80 | /**
81 | * Calling the convertToTranslucent method on platforms after Android 5.0
82 | */
83 | private static void convertActivityToTranslucentAfterL(Activity activity) {
84 | try {
85 | Method getActivityOptions = Activity.class.getDeclaredMethod("getActivityOptions");
86 | getActivityOptions.setAccessible(true);
87 | Object options = getActivityOptions.invoke(activity);
88 |
89 | Class[] classes = Activity.class.getDeclaredClasses();
90 | Class translucentConversionListenerClazz = null;
91 | for (Class clazz : classes) {
92 | if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
93 | translucentConversionListenerClazz = clazz;
94 | }
95 | }
96 | Method convertToTranslucent = Activity.class.getDeclaredMethod("convertToTranslucent",
97 | translucentConversionListenerClazz, ActivityOptions.class);
98 | convertToTranslucent.setAccessible(true);
99 | convertToTranslucent.invoke(activity, null, options);
100 | } catch (Throwable t) {
101 | }
102 | }
103 | }
104 |
--------------------------------------------------------------------------------
/gradlew:
--------------------------------------------------------------------------------
1 | #!/usr/bin/env bash
2 |
3 | ##############################################################################
4 | ##
5 | ## Gradle start up script for UN*X
6 | ##
7 | ##############################################################################
8 |
9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
10 | DEFAULT_JVM_OPTS=""
11 |
12 | APP_NAME="Gradle"
13 | APP_BASE_NAME=`basename "$0"`
14 |
15 | # Use the maximum available, or set MAX_FD != -1 to use that value.
16 | MAX_FD="maximum"
17 |
18 | warn ( ) {
19 | echo "$*"
20 | }
21 |
22 | die ( ) {
23 | echo
24 | echo "$*"
25 | echo
26 | exit 1
27 | }
28 |
29 | # OS specific support (must be 'true' or 'false').
30 | cygwin=false
31 | msys=false
32 | darwin=false
33 | case "`uname`" in
34 | CYGWIN* )
35 | cygwin=true
36 | ;;
37 | Darwin* )
38 | darwin=true
39 | ;;
40 | MINGW* )
41 | msys=true
42 | ;;
43 | esac
44 |
45 | # For Cygwin, ensure paths are in UNIX format before anything is touched.
46 | if $cygwin ; then
47 | [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
48 | fi
49 |
50 | # Attempt to set APP_HOME
51 | # Resolve links: $0 may be a link
52 | PRG="$0"
53 | # Need this for relative symlinks.
54 | while [ -h "$PRG" ] ; do
55 | ls=`ls -ld "$PRG"`
56 | link=`expr "$ls" : '.*-> \(.*\)$'`
57 | if expr "$link" : '/.*' > /dev/null; then
58 | PRG="$link"
59 | else
60 | PRG=`dirname "$PRG"`"/$link"
61 | fi
62 | done
63 | SAVED="`pwd`"
64 | cd "`dirname \"$PRG\"`/" >&-
65 | APP_HOME="`pwd -P`"
66 | cd "$SAVED" >&-
67 |
68 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
69 |
70 | # Determine the Java command to use to start the JVM.
71 | if [ -n "$JAVA_HOME" ] ; then
72 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
73 | # IBM's JDK on AIX uses strange locations for the executables
74 | JAVACMD="$JAVA_HOME/jre/sh/java"
75 | else
76 | JAVACMD="$JAVA_HOME/bin/java"
77 | fi
78 | if [ ! -x "$JAVACMD" ] ; then
79 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
80 |
81 | Please set the JAVA_HOME variable in your environment to match the
82 | location of your Java installation."
83 | fi
84 | else
85 | JAVACMD="java"
86 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
87 |
88 | Please set the JAVA_HOME variable in your environment to match the
89 | location of your Java installation."
90 | fi
91 |
92 | # Increase the maximum file descriptors if we can.
93 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
94 | MAX_FD_LIMIT=`ulimit -H -n`
95 | if [ $? -eq 0 ] ; then
96 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
97 | MAX_FD="$MAX_FD_LIMIT"
98 | fi
99 | ulimit -n $MAX_FD
100 | if [ $? -ne 0 ] ; then
101 | warn "Could not set maximum file descriptor limit: $MAX_FD"
102 | fi
103 | else
104 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
105 | fi
106 | fi
107 |
108 | # For Darwin, add options to specify how the application appears in the dock
109 | if $darwin; then
110 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
111 | fi
112 |
113 | # For Cygwin, switch paths to Windows format before running java
114 | if $cygwin ; then
115 | APP_HOME=`cygpath --path --mixed "$APP_HOME"`
116 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
117 |
118 | # We build the pattern for arguments to be converted via cygpath
119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
120 | SEP=""
121 | for dir in $ROOTDIRSRAW ; do
122 | ROOTDIRS="$ROOTDIRS$SEP$dir"
123 | SEP="|"
124 | done
125 | OURCYGPATTERN="(^($ROOTDIRS))"
126 | # Add a user-defined pattern to the cygpath arguments
127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then
128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
129 | fi
130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh
131 | i=0
132 | for arg in "$@" ; do
133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
135 |
136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
138 | else
139 | eval `echo args$i`="\"$arg\""
140 | fi
141 | i=$((i+1))
142 | done
143 | case $i in
144 | (0) set -- ;;
145 | (1) set -- "$args0" ;;
146 | (2) set -- "$args0" "$args1" ;;
147 | (3) set -- "$args0" "$args1" "$args2" ;;
148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
154 | esac
155 | fi
156 |
157 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
158 | function splitJvmOpts() {
159 | JVM_OPTS=("$@")
160 | }
161 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
162 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
163 |
164 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
165 |
--------------------------------------------------------------------------------
/samples/src/main/java/me/imid/swipebacklayout/demo/DemoActivity.java:
--------------------------------------------------------------------------------
1 |
2 | package me.imid.swipebacklayout.demo;
3 |
4 | import android.content.Context;
5 | import android.content.Intent;
6 | import android.content.res.Resources;
7 | import android.graphics.drawable.ColorDrawable;
8 | import android.net.Uri;
9 | import android.os.Bundle;
10 | import android.os.Vibrator;
11 | import android.support.v7.widget.Toolbar;
12 | import android.view.Menu;
13 | import android.view.MenuItem;
14 | import android.view.View;
15 | import android.widget.RadioGroup;
16 |
17 | import me.imid.swipebacklayout.lib.SwipeBackLayout;
18 | import me.imid.swipebacklayout.lib.app.SwipeBackActivity;
19 |
20 | /**
21 | * Created by Issac on 8/11/13.
22 | */
23 | public class DemoActivity extends SwipeBackActivity implements View.OnClickListener {
24 | private static final int VIBRATE_DURATION = 20;
25 |
26 | private int[] mBgColors;
27 |
28 | private static int mBgIndex = 0;
29 |
30 | private String mKeyTrackingMode;
31 |
32 | private RadioGroup mTrackingModeGroup;
33 |
34 | private SwipeBackLayout mSwipeBackLayout;
35 |
36 | private Toolbar mToolbar;
37 |
38 | @Override
39 | protected void onCreate(Bundle savedInstanceState) {
40 | super.onCreate(savedInstanceState);
41 | setContentView(R.layout.activity_demo);
42 | findViews();
43 | changeActionBarColor();
44 | mKeyTrackingMode = getString(R.string.key_tracking_mode);
45 | mSwipeBackLayout = getSwipeBackLayout();
46 |
47 | mTrackingModeGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
48 | @Override
49 | public void onCheckedChanged(RadioGroup group, int checkedId) {
50 | int edgeFlag;
51 | switch (checkedId) {
52 | case R.id.mode_left:
53 | edgeFlag = SwipeBackLayout.EDGE_LEFT;
54 | break;
55 | case R.id.mode_right:
56 | edgeFlag = SwipeBackLayout.EDGE_RIGHT;
57 | break;
58 | case R.id.mode_bottom:
59 | edgeFlag = SwipeBackLayout.EDGE_BOTTOM;
60 | break;
61 | default:
62 | edgeFlag = SwipeBackLayout.EDGE_ALL;
63 | }
64 | mSwipeBackLayout.setEdgeTrackingEnabled(edgeFlag);
65 | saveTrackingMode(edgeFlag);
66 | }
67 | });
68 | mSwipeBackLayout.addSwipeListener(new SwipeBackLayout.SwipeListener() {
69 | @Override
70 | public void onScrollStateChange(int state, float scrollPercent) {
71 |
72 | }
73 |
74 | @Override
75 | public void onEdgeTouch(int edgeFlag) {
76 | vibrate(VIBRATE_DURATION);
77 | }
78 |
79 | @Override
80 | public void onScrollOverThreshold() {
81 | vibrate(VIBRATE_DURATION);
82 | }
83 | });
84 | }
85 |
86 | @Override
87 | protected void onResume() {
88 | super.onResume();
89 | restoreTrackingMode();
90 | }
91 |
92 | private void saveTrackingMode(int flag) {
93 | PreferenceUtils.setPrefInt(getApplicationContext(), mKeyTrackingMode, flag);
94 | }
95 |
96 | private void restoreTrackingMode() {
97 | int flag = PreferenceUtils.getPrefInt(getApplicationContext(), mKeyTrackingMode,
98 | SwipeBackLayout.EDGE_LEFT);
99 | mSwipeBackLayout.setEdgeTrackingEnabled(flag);
100 | switch (flag) {
101 | case SwipeBackLayout.EDGE_LEFT:
102 | mTrackingModeGroup.check(R.id.mode_left);
103 | break;
104 | case SwipeBackLayout.EDGE_RIGHT:
105 | mTrackingModeGroup.check(R.id.mode_right);
106 | break;
107 | case SwipeBackLayout.EDGE_BOTTOM:
108 | mTrackingModeGroup.check(R.id.mode_bottom);
109 | break;
110 | case SwipeBackLayout.EDGE_ALL:
111 | mTrackingModeGroup.check(R.id.mode_all);
112 | break;
113 | }
114 | }
115 |
116 | private void changeActionBarColor() {
117 | getSupportActionBar().setBackgroundDrawable(new ColorDrawable(getColors()[mBgIndex]));
118 | mBgIndex++;
119 | if (mBgIndex >= getColors().length) {
120 | mBgIndex = 0;
121 | }
122 | }
123 |
124 | private void findViews() {
125 | setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
126 | findViewById(R.id.btn_start).setOnClickListener(this);
127 | findViewById(R.id.btn_finish).setOnClickListener(this);
128 | mTrackingModeGroup = (RadioGroup) findViewById(R.id.tracking_mode);
129 | }
130 |
131 | private int[] getColors() {
132 | if (mBgColors == null) {
133 | Resources resource = getResources();
134 | mBgColors = new int[] {
135 | resource.getColor(R.color.androidColorA),
136 | resource.getColor(R.color.androidColorB),
137 | resource.getColor(R.color.androidColorC),
138 | resource.getColor(R.color.androidColorD),
139 | resource.getColor(R.color.androidColorE),
140 | };
141 | }
142 | return mBgColors;
143 | }
144 |
145 | private void vibrate(long duration) {
146 | Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
147 | long[] pattern = {
148 | 0, duration
149 | };
150 | vibrator.vibrate(pattern, -1);
151 | }
152 |
153 | @Override
154 | public void onClick(View v) {
155 | switch (v.getId()) {
156 | case R.id.btn_start:
157 | startActivity(new Intent(DemoActivity.this, DemoActivity.class));
158 | break;
159 | case R.id.btn_finish:
160 | scrollToFinishActivity();
161 | break;
162 | }
163 | }
164 |
165 | @Override
166 | public boolean onCreateOptionsMenu(Menu menu) {
167 | getMenuInflater().inflate(R.menu.main, menu);
168 | return true;
169 | }
170 |
171 | @Override
172 | public boolean onOptionsItemSelected(MenuItem item) {
173 | switch (item.getItemId()) {
174 | case R.id.action_github:
175 | Intent intent = new Intent(Intent.ACTION_VIEW);
176 | intent.setData(Uri.parse("https://github.com/Issacw0ng/SwipeBackLayout"));
177 | startActivity(intent);
178 | return true;
179 | default:
180 | return super.onOptionsItemSelected(item);
181 | }
182 | }
183 |
184 | }
185 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | Apache License
2 | Version 2.0, January 2004
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--------------------------------------------------------------------------------
/library/src/main/java/me/imid/swipebacklayout/lib/SwipeBackLayout.java:
--------------------------------------------------------------------------------
1 | package me.imid.swipebacklayout.lib;
2 |
3 | import android.app.Activity;
4 | import android.content.Context;
5 | import android.content.res.TypedArray;
6 | import android.graphics.Canvas;
7 | import android.graphics.Rect;
8 | import android.graphics.drawable.Drawable;
9 | import android.support.v4.view.ViewCompat;
10 | import android.util.AttributeSet;
11 | import android.view.MotionEvent;
12 | import android.view.View;
13 | import android.view.ViewGroup;
14 | import android.widget.FrameLayout;
15 |
16 | import java.util.ArrayList;
17 | import java.util.List;
18 |
19 | public class SwipeBackLayout extends FrameLayout {
20 | /**
21 | * Minimum velocity that will be detected as a fling
22 | */
23 | private static final int MIN_FLING_VELOCITY = 400; // dips per second
24 |
25 | private static final int DEFAULT_SCRIM_COLOR = 0x99000000;
26 |
27 | private static final int FULL_ALPHA = 255;
28 |
29 | /**
30 | * Edge flag indicating that the left edge should be affected.
31 | */
32 | public static final int EDGE_LEFT = ViewDragHelper.EDGE_LEFT;
33 |
34 | /**
35 | * Edge flag indicating that the right edge should be affected.
36 | */
37 | public static final int EDGE_RIGHT = ViewDragHelper.EDGE_RIGHT;
38 |
39 | /**
40 | * Edge flag indicating that the bottom edge should be affected.
41 | */
42 | public static final int EDGE_BOTTOM = ViewDragHelper.EDGE_BOTTOM;
43 |
44 | /**
45 | * Edge flag set indicating all edges should be affected.
46 | */
47 | public static final int EDGE_ALL = EDGE_LEFT | EDGE_RIGHT | EDGE_BOTTOM;
48 |
49 | /**
50 | * A view is not currently being dragged or animating as a result of a
51 | * fling/snap.
52 | */
53 | public static final int STATE_IDLE = ViewDragHelper.STATE_IDLE;
54 |
55 | /**
56 | * A view is currently being dragged. The position is currently changing as
57 | * a result of user input or simulated user input.
58 | */
59 | public static final int STATE_DRAGGING = ViewDragHelper.STATE_DRAGGING;
60 |
61 | /**
62 | * A view is currently settling into place as a result of a fling or
63 | * predefined non-interactive motion.
64 | */
65 | public static final int STATE_SETTLING = ViewDragHelper.STATE_SETTLING;
66 |
67 | /**
68 | * Default threshold of scroll
69 | */
70 | private static final float DEFAULT_SCROLL_THRESHOLD = 0.3f;
71 |
72 | private static final int OVERSCROLL_DISTANCE = 10;
73 |
74 | private static final int[] EDGE_FLAGS = {
75 | EDGE_LEFT, EDGE_RIGHT, EDGE_BOTTOM, EDGE_ALL
76 | };
77 |
78 | private int mEdgeFlag;
79 |
80 | /**
81 | * Threshold of scroll, we will close the activity, when scrollPercent over
82 | * this value;
83 | */
84 | private float mScrollThreshold = DEFAULT_SCROLL_THRESHOLD;
85 |
86 | private Activity mActivity;
87 |
88 | private boolean mEnable = true;
89 |
90 | private View mContentView;
91 |
92 | private ViewDragHelper mDragHelper;
93 |
94 | private float mScrollPercent;
95 |
96 | private int mContentLeft;
97 |
98 | private int mContentTop;
99 |
100 | /**
101 | * The set of listeners to be sent events through.
102 | */
103 | private List mListeners;
104 |
105 | private Drawable mShadowLeft;
106 |
107 | private Drawable mShadowRight;
108 |
109 | private Drawable mShadowBottom;
110 |
111 | private float mScrimOpacity;
112 |
113 | private int mScrimColor = DEFAULT_SCRIM_COLOR;
114 |
115 | private boolean mInLayout;
116 |
117 | private Rect mTmpRect = new Rect();
118 |
119 | /**
120 | * Edge being dragged
121 | */
122 | private int mTrackingEdge;
123 |
124 | public SwipeBackLayout(Context context) {
125 | this(context, null);
126 | }
127 |
128 | public SwipeBackLayout(Context context, AttributeSet attrs) {
129 | this(context, attrs, R.attr.SwipeBackLayoutStyle);
130 | }
131 |
132 | public SwipeBackLayout(Context context, AttributeSet attrs, int defStyle) {
133 | super(context, attrs);
134 | mDragHelper = ViewDragHelper.create(this, new ViewDragCallback());
135 |
136 | TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SwipeBackLayout, defStyle,
137 | R.style.SwipeBackLayout);
138 |
139 | int edgeSize = a.getDimensionPixelSize(R.styleable.SwipeBackLayout_edge_size, -1);
140 | if (edgeSize > 0)
141 | setEdgeSize(edgeSize);
142 | int mode = EDGE_FLAGS[a.getInt(R.styleable.SwipeBackLayout_edge_flag, 0)];
143 | setEdgeTrackingEnabled(mode);
144 |
145 | int shadowLeft = a.getResourceId(R.styleable.SwipeBackLayout_shadow_left,
146 | R.drawable.shadow_left);
147 | int shadowRight = a.getResourceId(R.styleable.SwipeBackLayout_shadow_right,
148 | R.drawable.shadow_right);
149 | int shadowBottom = a.getResourceId(R.styleable.SwipeBackLayout_shadow_bottom,
150 | R.drawable.shadow_bottom);
151 | setShadow(shadowLeft, EDGE_LEFT);
152 | setShadow(shadowRight, EDGE_RIGHT);
153 | setShadow(shadowBottom, EDGE_BOTTOM);
154 | a.recycle();
155 | final float density = getResources().getDisplayMetrics().density;
156 | final float minVel = MIN_FLING_VELOCITY * density;
157 | mDragHelper.setMinVelocity(minVel);
158 | mDragHelper.setMaxVelocity(minVel * 2f);
159 | }
160 |
161 | /**
162 | * Sets the sensitivity of the NavigationLayout.
163 | *
164 | * @param context The application context.
165 | * @param sensitivity value between 0 and 1, the final value for touchSlop =
166 | * ViewConfiguration.getScaledTouchSlop * (1 / s);
167 | */
168 | public void setSensitivity(Context context, float sensitivity) {
169 | mDragHelper.setSensitivity(context, sensitivity);
170 | }
171 |
172 | /**
173 | * Set up contentView which will be moved by user gesture
174 | *
175 | * @param view
176 | */
177 | private void setContentView(View view) {
178 | mContentView = view;
179 | }
180 |
181 | public void setEnableGesture(boolean enable) {
182 | mEnable = enable;
183 | }
184 |
185 | /**
186 | * Enable edge tracking for the selected edges of the parent view. The
187 | * callback's
188 | * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#onEdgeTouched(int, int)}
189 | * and
190 | * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#onEdgeDragStarted(int, int)}
191 | * methods will only be invoked for edges for which edge tracking has been
192 | * enabled.
193 | *
194 | * @param edgeFlags Combination of edge flags describing the edges to watch
195 | * @see #EDGE_LEFT
196 | * @see #EDGE_RIGHT
197 | * @see #EDGE_BOTTOM
198 | */
199 | public void setEdgeTrackingEnabled(int edgeFlags) {
200 | mEdgeFlag = edgeFlags;
201 | mDragHelper.setEdgeTrackingEnabled(mEdgeFlag);
202 | }
203 |
204 | /**
205 | * Set a color to use for the scrim that obscures primary content while a
206 | * drawer is open.
207 | *
208 | * @param color Color to use in 0xAARRGGBB format.
209 | */
210 | public void setScrimColor(int color) {
211 | mScrimColor = color;
212 | invalidate();
213 | }
214 |
215 | /**
216 | * Set the size of an edge. This is the range in pixels along the edges of
217 | * this view that will actively detect edge touches or drags if edge
218 | * tracking is enabled.
219 | *
220 | * @param size The size of an edge in pixels
221 | */
222 | public void setEdgeSize(int size) {
223 | mDragHelper.setEdgeSize(size);
224 | }
225 |
226 | /**
227 | * Register a callback to be invoked when a swipe event is sent to this
228 | * view.
229 | *
230 | * @param listener the swipe listener to attach to this view
231 | * @deprecated use {@link #addSwipeListener} instead
232 | */
233 | @Deprecated
234 | public void setSwipeListener(SwipeListener listener) {
235 | addSwipeListener(listener);
236 | }
237 |
238 | /**
239 | * Add a callback to be invoked when a swipe event is sent to this view.
240 | *
241 | * @param listener the swipe listener to attach to this view
242 | */
243 | public void addSwipeListener(SwipeListener listener) {
244 | if (mListeners == null) {
245 | mListeners = new ArrayList();
246 | }
247 | mListeners.add(listener);
248 | }
249 |
250 | /**
251 | * Removes a listener from the set of listeners
252 | *
253 | * @param listener
254 | */
255 | public void removeSwipeListener(SwipeListener listener) {
256 | if (mListeners == null) {
257 | return;
258 | }
259 | mListeners.remove(listener);
260 | }
261 |
262 | public static interface SwipeListener {
263 | /**
264 | * Invoke when state change
265 | *
266 | * @param state flag to describe scroll state
267 | * @param scrollPercent scroll percent of this view
268 | * @see #STATE_IDLE
269 | * @see #STATE_DRAGGING
270 | * @see #STATE_SETTLING
271 | */
272 | public void onScrollStateChange(int state, float scrollPercent);
273 |
274 | /**
275 | * Invoke when edge touched
276 | *
277 | * @param edgeFlag edge flag describing the edge being touched
278 | * @see #EDGE_LEFT
279 | * @see #EDGE_RIGHT
280 | * @see #EDGE_BOTTOM
281 | */
282 | public void onEdgeTouch(int edgeFlag);
283 |
284 | /**
285 | * Invoke when scroll percent over the threshold for the first time
286 | */
287 | public void onScrollOverThreshold();
288 | }
289 |
290 | /**
291 | * Set scroll threshold, we will close the activity, when scrollPercent over
292 | * this value
293 | *
294 | * @param threshold
295 | */
296 | public void setScrollThresHold(float threshold) {
297 | if (threshold >= 1.0f || threshold <= 0) {
298 | throw new IllegalArgumentException("Threshold value should be between 0 and 1.0");
299 | }
300 | mScrollThreshold = threshold;
301 | }
302 |
303 | /**
304 | * Set a drawable used for edge shadow.
305 | *
306 | * @param shadow Drawable to use
307 | * @param edgeFlags Combination of edge flags describing the edge to set
308 | * @see #EDGE_LEFT
309 | * @see #EDGE_RIGHT
310 | * @see #EDGE_BOTTOM
311 | */
312 | public void setShadow(Drawable shadow, int edgeFlag) {
313 | if ((edgeFlag & EDGE_LEFT) != 0) {
314 | mShadowLeft = shadow;
315 | } else if ((edgeFlag & EDGE_RIGHT) != 0) {
316 | mShadowRight = shadow;
317 | } else if ((edgeFlag & EDGE_BOTTOM) != 0) {
318 | mShadowBottom = shadow;
319 | }
320 | invalidate();
321 | }
322 |
323 | /**
324 | * Set a drawable used for edge shadow.
325 | *
326 | * @param resId Resource of drawable to use
327 | * @param edgeFlags Combination of edge flags describing the edge to set
328 | * @see #EDGE_LEFT
329 | * @see #EDGE_RIGHT
330 | * @see #EDGE_BOTTOM
331 | */
332 | public void setShadow(int resId, int edgeFlag) {
333 | setShadow(getResources().getDrawable(resId), edgeFlag);
334 | }
335 |
336 | /**
337 | * Scroll out contentView and finish the activity
338 | */
339 | public void scrollToFinishActivity() {
340 | final int childWidth = mContentView.getWidth();
341 | final int childHeight = mContentView.getHeight();
342 |
343 | int left = 0, top = 0;
344 | if ((mEdgeFlag & EDGE_LEFT) != 0) {
345 | left = childWidth + mShadowLeft.getIntrinsicWidth() + OVERSCROLL_DISTANCE;
346 | mTrackingEdge = EDGE_LEFT;
347 | } else if ((mEdgeFlag & EDGE_RIGHT) != 0) {
348 | left = -childWidth - mShadowRight.getIntrinsicWidth() - OVERSCROLL_DISTANCE;
349 | mTrackingEdge = EDGE_RIGHT;
350 | } else if ((mEdgeFlag & EDGE_BOTTOM) != 0) {
351 | top = -childHeight - mShadowBottom.getIntrinsicHeight() - OVERSCROLL_DISTANCE;
352 | mTrackingEdge = EDGE_BOTTOM;
353 | }
354 |
355 | mDragHelper.smoothSlideViewTo(mContentView, left, top);
356 | invalidate();
357 | }
358 |
359 | @Override
360 | public boolean onInterceptTouchEvent(MotionEvent event) {
361 | if (!mEnable) {
362 | return false;
363 | }
364 | try {
365 | return mDragHelper.shouldInterceptTouchEvent(event);
366 | } catch (ArrayIndexOutOfBoundsException e) {
367 | // FIXME: handle exception
368 | // issues #9
369 | return false;
370 | }
371 | }
372 |
373 | @Override
374 | public boolean onTouchEvent(MotionEvent event) {
375 | if (!mEnable) {
376 | return false;
377 | }
378 | mDragHelper.processTouchEvent(event);
379 | return true;
380 | }
381 |
382 | @Override
383 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
384 | mInLayout = true;
385 | if (mContentView != null)
386 | mContentView.layout(mContentLeft, mContentTop,
387 | mContentLeft + mContentView.getMeasuredWidth(),
388 | mContentTop + mContentView.getMeasuredHeight());
389 | mInLayout = false;
390 | }
391 |
392 | @Override
393 | public void requestLayout() {
394 | if (!mInLayout) {
395 | super.requestLayout();
396 | }
397 | }
398 |
399 | @Override
400 | protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
401 | final boolean drawContent = child == mContentView;
402 |
403 | boolean ret = super.drawChild(canvas, child, drawingTime);
404 | if (mScrimOpacity > 0 && drawContent
405 | && mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE) {
406 | drawShadow(canvas, child);
407 | drawScrim(canvas, child);
408 | }
409 | return ret;
410 | }
411 |
412 | private void drawScrim(Canvas canvas, View child) {
413 | final int baseAlpha = (mScrimColor & 0xff000000) >>> 24;
414 | final int alpha = (int) (baseAlpha * mScrimOpacity);
415 | final int color = alpha << 24 | (mScrimColor & 0xffffff);
416 |
417 | if ((mTrackingEdge & EDGE_LEFT) != 0) {
418 | canvas.clipRect(0, 0, child.getLeft(), getHeight());
419 | } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
420 | canvas.clipRect(child.getRight(), 0, getRight(), getHeight());
421 | } else if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
422 | canvas.clipRect(child.getLeft(), child.getBottom(), getRight(), getHeight());
423 | }
424 | canvas.drawColor(color);
425 | }
426 |
427 | private void drawShadow(Canvas canvas, View child) {
428 | final Rect childRect = mTmpRect;
429 | child.getHitRect(childRect);
430 |
431 | if ((mEdgeFlag & EDGE_LEFT) != 0) {
432 | mShadowLeft.setBounds(childRect.left - mShadowLeft.getIntrinsicWidth(), childRect.top,
433 | childRect.left, childRect.bottom);
434 | mShadowLeft.setAlpha((int) (mScrimOpacity * FULL_ALPHA));
435 | mShadowLeft.draw(canvas);
436 | }
437 |
438 | if ((mEdgeFlag & EDGE_RIGHT) != 0) {
439 | mShadowRight.setBounds(childRect.right, childRect.top,
440 | childRect.right + mShadowRight.getIntrinsicWidth(), childRect.bottom);
441 | mShadowRight.setAlpha((int) (mScrimOpacity * FULL_ALPHA));
442 | mShadowRight.draw(canvas);
443 | }
444 |
445 | if ((mEdgeFlag & EDGE_BOTTOM) != 0) {
446 | mShadowBottom.setBounds(childRect.left, childRect.bottom, childRect.right,
447 | childRect.bottom + mShadowBottom.getIntrinsicHeight());
448 | mShadowBottom.setAlpha((int) (mScrimOpacity * FULL_ALPHA));
449 | mShadowBottom.draw(canvas);
450 | }
451 | }
452 |
453 | public void attachToActivity(Activity activity) {
454 | mActivity = activity;
455 | TypedArray a = activity.getTheme().obtainStyledAttributes(new int[]{
456 | android.R.attr.windowBackground
457 | });
458 | int background = a.getResourceId(0, 0);
459 | a.recycle();
460 |
461 | ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
462 | ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
463 | decorChild.setBackgroundResource(background);
464 | decor.removeView(decorChild);
465 | addView(decorChild);
466 | setContentView(decorChild);
467 | decor.addView(this);
468 | }
469 |
470 | @Override
471 | public void computeScroll() {
472 | mScrimOpacity = 1 - mScrollPercent;
473 | if (mDragHelper.continueSettling(true)) {
474 | ViewCompat.postInvalidateOnAnimation(this);
475 | }
476 | }
477 |
478 | private class ViewDragCallback extends ViewDragHelper.Callback {
479 | private boolean mIsScrollOverValid;
480 |
481 | @Override
482 | public boolean tryCaptureView(View view, int i) {
483 | boolean ret = mDragHelper.isEdgeTouched(mEdgeFlag, i);
484 | if (ret) {
485 | if (mDragHelper.isEdgeTouched(EDGE_LEFT, i)) {
486 | mTrackingEdge = EDGE_LEFT;
487 | } else if (mDragHelper.isEdgeTouched(EDGE_RIGHT, i)) {
488 | mTrackingEdge = EDGE_RIGHT;
489 | } else if (mDragHelper.isEdgeTouched(EDGE_BOTTOM, i)) {
490 | mTrackingEdge = EDGE_BOTTOM;
491 | }
492 | if (mListeners != null && !mListeners.isEmpty()) {
493 | for (SwipeListener listener : mListeners) {
494 | listener.onEdgeTouch(mTrackingEdge);
495 | }
496 | }
497 | mIsScrollOverValid = true;
498 | }
499 | boolean directionCheck = false;
500 | if (mEdgeFlag == EDGE_LEFT || mEdgeFlag == EDGE_RIGHT) {
501 | directionCheck = !mDragHelper.checkTouchSlop(ViewDragHelper.DIRECTION_VERTICAL, i);
502 | } else if (mEdgeFlag == EDGE_BOTTOM) {
503 | directionCheck = !mDragHelper
504 | .checkTouchSlop(ViewDragHelper.DIRECTION_HORIZONTAL, i);
505 | } else if (mEdgeFlag == EDGE_ALL) {
506 | directionCheck = true;
507 | }
508 | return ret & directionCheck;
509 | }
510 |
511 | @Override
512 | public int getViewHorizontalDragRange(View child) {
513 | return mEdgeFlag & (EDGE_LEFT | EDGE_RIGHT);
514 | }
515 |
516 | @Override
517 | public int getViewVerticalDragRange(View child) {
518 | return mEdgeFlag & EDGE_BOTTOM;
519 | }
520 |
521 | @Override
522 | public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
523 | super.onViewPositionChanged(changedView, left, top, dx, dy);
524 | if ((mTrackingEdge & EDGE_LEFT) != 0) {
525 | mScrollPercent = Math.abs((float) left
526 | / (mContentView.getWidth() + mShadowLeft.getIntrinsicWidth()));
527 | } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
528 | mScrollPercent = Math.abs((float) left
529 | / (mContentView.getWidth() + mShadowRight.getIntrinsicWidth()));
530 | } else if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
531 | mScrollPercent = Math.abs((float) top
532 | / (mContentView.getHeight() + mShadowBottom.getIntrinsicHeight()));
533 | }
534 | mContentLeft = left;
535 | mContentTop = top;
536 | invalidate();
537 | if (mScrollPercent < mScrollThreshold && !mIsScrollOverValid) {
538 | mIsScrollOverValid = true;
539 | }
540 | if (mListeners != null && !mListeners.isEmpty()
541 | && mDragHelper.getViewDragState() == STATE_DRAGGING
542 | && mScrollPercent >= mScrollThreshold && mIsScrollOverValid) {
543 | mIsScrollOverValid = false;
544 | for (SwipeListener listener : mListeners) {
545 | listener.onScrollOverThreshold();
546 | }
547 | }
548 |
549 | if (mScrollPercent >= 1) {
550 | if (!mActivity.isFinishing()) {
551 | mActivity.finish();
552 | mActivity.overridePendingTransition(0, 0);
553 | }
554 | }
555 | }
556 |
557 | @Override
558 | public void onViewReleased(View releasedChild, float xvel, float yvel) {
559 | final int childWidth = releasedChild.getWidth();
560 | final int childHeight = releasedChild.getHeight();
561 |
562 | int left = 0, top = 0;
563 | if ((mTrackingEdge & EDGE_LEFT) != 0) {
564 | left = xvel > 0 || xvel == 0 && mScrollPercent > mScrollThreshold ? childWidth
565 | + mShadowLeft.getIntrinsicWidth() + OVERSCROLL_DISTANCE : 0;
566 | } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
567 | left = xvel < 0 || xvel == 0 && mScrollPercent > mScrollThreshold ? -(childWidth
568 | + mShadowLeft.getIntrinsicWidth() + OVERSCROLL_DISTANCE) : 0;
569 | } else if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
570 | top = yvel < 0 || yvel == 0 && mScrollPercent > mScrollThreshold ? -(childHeight
571 | + mShadowBottom.getIntrinsicHeight() + OVERSCROLL_DISTANCE) : 0;
572 | }
573 |
574 | mDragHelper.settleCapturedViewAt(left, top);
575 | invalidate();
576 | }
577 |
578 | @Override
579 | public int clampViewPositionHorizontal(View child, int left, int dx) {
580 | int ret = 0;
581 | if ((mTrackingEdge & EDGE_LEFT) != 0) {
582 | ret = Math.min(child.getWidth(), Math.max(left, 0));
583 | } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
584 | ret = Math.min(0, Math.max(left, -child.getWidth()));
585 | }
586 | return ret;
587 | }
588 |
589 | @Override
590 | public int clampViewPositionVertical(View child, int top, int dy) {
591 | int ret = 0;
592 | if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
593 | ret = Math.min(0, Math.max(top, -child.getHeight()));
594 | }
595 | return ret;
596 | }
597 |
598 | @Override
599 | public void onViewDragStateChanged(int state) {
600 | super.onViewDragStateChanged(state);
601 | if (mListeners != null && !mListeners.isEmpty()) {
602 | for (SwipeListener listener : mListeners) {
603 | listener.onScrollStateChange(state, mScrollPercent);
604 | }
605 | }
606 | }
607 | }
608 | }
609 |
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/library/src/main/java/me/imid/swipebacklayout/lib/ViewDragHelper.java:
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1 | /*
2 | * Copyright (C) 2013 The Android Open Source Project
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | */
16 |
17 | package me.imid.swipebacklayout.lib;
18 |
19 | import android.content.Context;
20 | import android.support.v4.view.MotionEventCompat;
21 | import android.support.v4.view.VelocityTrackerCompat;
22 | import android.support.v4.view.ViewCompat;
23 | import android.support.v4.widget.ScrollerCompat;
24 | import android.view.MotionEvent;
25 | import android.view.VelocityTracker;
26 | import android.view.View;
27 | import android.view.ViewConfiguration;
28 | import android.view.ViewGroup;
29 | import android.view.animation.Interpolator;
30 |
31 | import java.util.Arrays;
32 |
33 | /**
34 | * ViewDragHelper is a utility class for writing custom ViewGroups. It offers a
35 | * number of useful operations and state tracking for allowing a user to drag
36 | * and reposition views within their parent ViewGroup.
37 | */
38 | public class ViewDragHelper {
39 | private static final String TAG = "ViewDragHelper";
40 |
41 | /**
42 | * A null/invalid pointer ID.
43 | */
44 | public static final int INVALID_POINTER = -1;
45 |
46 | /**
47 | * A view is not currently being dragged or animating as a result of a
48 | * fling/snap.
49 | */
50 | public static final int STATE_IDLE = 0;
51 |
52 | /**
53 | * A view is currently being dragged. The position is currently changing as
54 | * a result of user input or simulated user input.
55 | */
56 | public static final int STATE_DRAGGING = 1;
57 |
58 | /**
59 | * A view is currently settling into place as a result of a fling or
60 | * predefined non-interactive motion.
61 | */
62 | public static final int STATE_SETTLING = 2;
63 |
64 | /**
65 | * Edge flag indicating that the left edge should be affected.
66 | */
67 | public static final int EDGE_LEFT = 1 << 0;
68 |
69 | /**
70 | * Edge flag indicating that the right edge should be affected.
71 | */
72 | public static final int EDGE_RIGHT = 1 << 1;
73 |
74 | /**
75 | * Edge flag indicating that the top edge should be affected.
76 | */
77 | public static final int EDGE_TOP = 1 << 2;
78 |
79 | /**
80 | * Edge flag indicating that the bottom edge should be affected.
81 | */
82 | public static final int EDGE_BOTTOM = 1 << 3;
83 |
84 | /**
85 | * Edge flag set indicating all edges should be affected.
86 | */
87 | public static final int EDGE_ALL = EDGE_LEFT | EDGE_TOP | EDGE_RIGHT | EDGE_BOTTOM;
88 |
89 | /**
90 | * Indicates that a check should occur along the horizontal axis
91 | */
92 | public static final int DIRECTION_HORIZONTAL = 1 << 0;
93 |
94 | /**
95 | * Indicates that a check should occur along the vertical axis
96 | */
97 | public static final int DIRECTION_VERTICAL = 1 << 1;
98 |
99 | /**
100 | * Indicates that a check should occur along all axes
101 | */
102 | public static final int DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL;
103 |
104 | public static final int EDGE_SIZE = 20; // dp
105 |
106 | private static final int BASE_SETTLE_DURATION = 256; // ms
107 |
108 | private static final int MAX_SETTLE_DURATION = 600; // ms
109 |
110 | // Current drag state; idle, dragging or settling
111 | private int mDragState;
112 |
113 | // Distance to travel before a drag may begin
114 | private int mTouchSlop;
115 |
116 | // Last known position/pointer tracking
117 | private int mActivePointerId = INVALID_POINTER;
118 |
119 | private float[] mInitialMotionX;
120 |
121 | private float[] mInitialMotionY;
122 |
123 | private float[] mLastMotionX;
124 |
125 | private float[] mLastMotionY;
126 |
127 | private int[] mInitialEdgeTouched;
128 |
129 | private int[] mEdgeDragsInProgress;
130 |
131 | private int[] mEdgeDragsLocked;
132 |
133 | private int mPointersDown;
134 |
135 | private VelocityTracker mVelocityTracker;
136 |
137 | private float mMaxVelocity;
138 |
139 | private float mMinVelocity;
140 |
141 | private int mEdgeSize;
142 |
143 | private int mTrackingEdges;
144 |
145 | private ScrollerCompat mScroller;
146 |
147 | private final Callback mCallback;
148 |
149 | private View mCapturedView;
150 |
151 | private boolean mReleaseInProgress;
152 |
153 | private final ViewGroup mParentView;
154 |
155 | /**
156 | * A Callback is used as a communication channel with the ViewDragHelper
157 | * back to the parent view using it. on*methods are invoked on
158 | * siginficant events and several accessor methods are expected to provide
159 | * the ViewDragHelper with more information about the state of the parent
160 | * view upon request. The callback also makes decisions governing the range
161 | * and draggability of child views.
162 | */
163 | public static abstract class Callback {
164 | /**
165 | * Called when the drag state changes. See the STATE_*
166 | * constants for more information.
167 | *
168 | * @param state The new drag state
169 | * @see #STATE_IDLE
170 | * @see #STATE_DRAGGING
171 | * @see #STATE_SETTLING
172 | */
173 | public void onViewDragStateChanged(int state) {
174 | }
175 |
176 | /**
177 | * Called when the captured view's position changes as the result of a
178 | * drag or settle.
179 | *
180 | * @param changedView View whose position changed
181 | * @param left New X coordinate of the left edge of the view
182 | * @param top New Y coordinate of the top edge of the view
183 | * @param dx Change in X position from the last call
184 | * @param dy Change in Y position from the last call
185 | */
186 | public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
187 | }
188 |
189 | /**
190 | * Called when a child view is captured for dragging or settling. The ID
191 | * of the pointer currently dragging the captured view is supplied. If
192 | * activePointerId is identified as {@link #INVALID_POINTER} the capture
193 | * is programmatic instead of pointer-initiated.
194 | *
195 | * @param capturedChild Child view that was captured
196 | * @param activePointerId Pointer id tracking the child capture
197 | */
198 | public void onViewCaptured(View capturedChild, int activePointerId) {
199 | }
200 |
201 | /**
202 | * Called when the child view is no longer being actively dragged. The
203 | * fling velocity is also supplied, if relevant. The velocity values may
204 | * be clamped to system minimums or maximums.
205 | *
206 | * Calling code may decide to fling or otherwise release the view to let
207 | * it settle into place. It should do so using
208 | * {@link #settleCapturedViewAt(int, int)} or
209 | * {@link #flingCapturedView(int, int, int, int)}. If the Callback
210 | * invokes one of these methods, the ViewDragHelper will enter
211 | * {@link #STATE_SETTLING} and the view capture will not fully end until
212 | * it comes to a complete stop. If neither of these methods is invoked
213 | * before onViewReleased returns, the view will stop in
214 | * place and the ViewDragHelper will return to {@link #STATE_IDLE}.
215 | *
216 | *
217 | * @param releasedChild The captured child view now being released
218 | * @param xvel X velocity of the pointer as it left the screen in pixels
219 | * per second.
220 | * @param yvel Y velocity of the pointer as it left the screen in pixels
221 | * per second.
222 | */
223 | public void onViewReleased(View releasedChild, float xvel, float yvel) {
224 | }
225 |
226 | /**
227 | * Called when one of the subscribed edges in the parent view has been
228 | * touched by the user while no child view is currently captured.
229 | *
230 | * @param edgeFlags A combination of edge flags describing the edge(s)
231 | * currently touched
232 | * @param pointerId ID of the pointer touching the described edge(s)
233 | * @see #EDGE_LEFT
234 | * @see #EDGE_TOP
235 | * @see #EDGE_RIGHT
236 | * @see #EDGE_BOTTOM
237 | */
238 | public void onEdgeTouched(int edgeFlags, int pointerId) {
239 | }
240 |
241 | /**
242 | * Called when the given edge may become locked. This can happen if an
243 | * edge drag was preliminarily rejected before beginning, but after
244 | * {@link #onEdgeTouched(int, int)} was called. This method should
245 | * return true to lock this edge or false to leave it unlocked. The
246 | * default behavior is to leave edges unlocked.
247 | *
248 | * @param edgeFlags A combination of edge flags describing the edge(s)
249 | * locked
250 | * @return true to lock the edge, false to leave it unlocked
251 | */
252 | public boolean onEdgeLock(int edgeFlags) {
253 | return false;
254 | }
255 |
256 | /**
257 | * Called when the user has started a deliberate drag away from one of
258 | * the subscribed edges in the parent view while no child view is
259 | * currently captured.
260 | *
261 | * @param edgeFlags A combination of edge flags describing the edge(s)
262 | * dragged
263 | * @param pointerId ID of the pointer touching the described edge(s)
264 | * @see #EDGE_LEFT
265 | * @see #EDGE_TOP
266 | * @see #EDGE_RIGHT
267 | * @see #EDGE_BOTTOM
268 | */
269 | public void onEdgeDragStarted(int edgeFlags, int pointerId) {
270 | }
271 |
272 | /**
273 | * Called to determine the Z-order of child views.
274 | *
275 | * @param index the ordered position to query for
276 | * @return index of the view that should be ordered at position
277 | * index
278 | */
279 | public int getOrderedChildIndex(int index) {
280 | return index;
281 | }
282 |
283 | /**
284 | * Return the magnitude of a draggable child view's horizontal range of
285 | * motion in pixels. This method should return 0 for views that cannot
286 | * move horizontally.
287 | *
288 | * @param child Child view to check
289 | * @return range of horizontal motion in pixels
290 | */
291 | public int getViewHorizontalDragRange(View child) {
292 | return 0;
293 | }
294 |
295 | /**
296 | * Return the magnitude of a draggable child view's vertical range of
297 | * motion in pixels. This method should return 0 for views that cannot
298 | * move vertically.
299 | *
300 | * @param child Child view to check
301 | * @return range of vertical motion in pixels
302 | */
303 | public int getViewVerticalDragRange(View child) {
304 | return 0;
305 | }
306 |
307 | /**
308 | * Called when the user's input indicates that they want to capture the
309 | * given child view with the pointer indicated by pointerId. The
310 | * callback should return true if the user is permitted to drag the
311 | * given view with the indicated pointer.
312 | *
313 | * ViewDragHelper may call this method multiple times for the same view
314 | * even if the view is already captured; this indicates that a new
315 | * pointer is trying to take control of the view.
316 | *
317 | *
318 | * If this method returns true, a call to
319 | * {@link #onViewCaptured(android.view.View, int)} will follow if the
320 | * capture is successful.
321 | *
322 | *
323 | * @param child Child the user is attempting to capture
324 | * @param pointerId ID of the pointer attempting the capture
325 | * @return true if capture should be allowed, false otherwise
326 | */
327 | public abstract boolean tryCaptureView(View child, int pointerId);
328 |
329 | /**
330 | * Restrict the motion of the dragged child view along the horizontal
331 | * axis. The default implementation does not allow horizontal motion;
332 | * the extending class must override this method and provide the desired
333 | * clamping.
334 | *
335 | * @param child Child view being dragged
336 | * @param left Attempted motion along the X axis
337 | * @param dx Proposed change in position for left
338 | * @return The new clamped position for left
339 | */
340 | public int clampViewPositionHorizontal(View child, int left, int dx) {
341 | return 0;
342 | }
343 |
344 | /**
345 | * Restrict the motion of the dragged child view along the vertical
346 | * axis. The default implementation does not allow vertical motion; the
347 | * extending class must override this method and provide the desired
348 | * clamping.
349 | *
350 | * @param child Child view being dragged
351 | * @param top Attempted motion along the Y axis
352 | * @param dy Proposed change in position for top
353 | * @return The new clamped position for top
354 | */
355 | public int clampViewPositionVertical(View child, int top, int dy) {
356 | return 0;
357 | }
358 | }
359 |
360 | /**
361 | * Interpolator defining the animation curve for mScroller
362 | */
363 | private static final Interpolator sInterpolator = new Interpolator() {
364 | public float getInterpolation(float t) {
365 | t -= 1.0f;
366 | return t * t * t * t * t + 1.0f;
367 | }
368 | };
369 |
370 | private final Runnable mSetIdleRunnable = new Runnable() {
371 | public void run() {
372 | setDragState(STATE_IDLE);
373 | }
374 | };
375 |
376 | /**
377 | * Factory method to create a new ViewDragHelper.
378 | *
379 | * @param forParent Parent view to monitor
380 | * @param cb Callback to provide information and receive events
381 | * @return a new ViewDragHelper instance
382 | */
383 | public static ViewDragHelper create(ViewGroup forParent, Callback cb) {
384 | return new ViewDragHelper(forParent.getContext(), forParent, cb);
385 | }
386 |
387 | /**
388 | * Factory method to create a new ViewDragHelper.
389 | *
390 | * @param forParent Parent view to monitor
391 | * @param sensitivity Multiplier for how sensitive the helper should be
392 | * about detecting the start of a drag. Larger values are more
393 | * sensitive. 1.0f is normal.
394 | * @param cb Callback to provide information and receive events
395 | * @return a new ViewDragHelper instance
396 | */
397 | public static ViewDragHelper create(ViewGroup forParent, float sensitivity, Callback cb) {
398 | final ViewDragHelper helper = create(forParent, cb);
399 | helper.mTouchSlop = (int) (helper.mTouchSlop * (1 / sensitivity));
400 | return helper;
401 | }
402 |
403 | /**
404 | * Apps should use ViewDragHelper.create() to get a new instance. This will
405 | * allow VDH to use internal compatibility implementations for different
406 | * platform versions.
407 | *
408 | * @param context Context to initialize config-dependent params from
409 | * @param forParent Parent view to monitor
410 | */
411 | private ViewDragHelper(Context context, ViewGroup forParent, Callback cb) {
412 | if (forParent == null) {
413 | throw new IllegalArgumentException("Parent view may not be null");
414 | }
415 | if (cb == null) {
416 | throw new IllegalArgumentException("Callback may not be null");
417 | }
418 |
419 | mParentView = forParent;
420 | mCallback = cb;
421 |
422 | final ViewConfiguration vc = ViewConfiguration.get(context);
423 | final float density = context.getResources().getDisplayMetrics().density;
424 | mEdgeSize = (int) (EDGE_SIZE * density + 0.5f);
425 |
426 | mTouchSlop = vc.getScaledTouchSlop();
427 | mMaxVelocity = vc.getScaledMaximumFlingVelocity();
428 | mMinVelocity = vc.getScaledMinimumFlingVelocity();
429 | mScroller = ScrollerCompat.create(context, sInterpolator);
430 | }
431 |
432 | /**
433 | * Sets the sensitivity of the dragger.
434 | *
435 | * @param context The application context.
436 | * @param sensitivity value between 0 and 1, the final value for touchSlop =
437 | * ViewConfiguration.getScaledTouchSlop * (1 / s);
438 | */
439 | public void setSensitivity(Context context, float sensitivity) {
440 | float s = Math.max(0f, Math.min(1.0f, sensitivity));
441 | ViewConfiguration viewConfiguration = ViewConfiguration.get(context);
442 | mTouchSlop = (int) (viewConfiguration.getScaledTouchSlop() * (1 / s));
443 | }
444 |
445 | /**
446 | * Set the minimum velocity that will be detected as having a magnitude
447 | * greater than zero in pixels per second. Callback methods accepting a
448 | * velocity will be clamped appropriately.
449 | *
450 | * @param minVel minimum velocity to detect
451 | */
452 | public void setMinVelocity(float minVel) {
453 | mMinVelocity = minVel;
454 | }
455 |
456 | /**
457 | * Set the max velocity that will be detected as having a magnitude
458 | * greater than zero in pixels per second. Callback methods accepting a
459 | * velocity will be clamped appropriately.
460 | *
461 | * @param maxVel max velocity to detect
462 | */
463 | public void setMaxVelocity(float maxVel) {
464 | mMaxVelocity = maxVel;
465 | }
466 |
467 | /**
468 | * Return the currently configured minimum velocity. Any flings with a
469 | * magnitude less than this value in pixels per second. Callback methods
470 | * accepting a velocity will receive zero as a velocity value if the real
471 | * detected velocity was below this threshold.
472 | *
473 | * @return the minimum velocity that will be detected
474 | */
475 | public float getMinVelocity() {
476 | return mMinVelocity;
477 | }
478 |
479 | /**
480 | * Retrieve the current drag state of this helper. This will return one of
481 | * {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
482 | *
483 | * @return The current drag state
484 | */
485 | public int getViewDragState() {
486 | return mDragState;
487 | }
488 |
489 | /**
490 | * Enable edge tracking for the selected edges of the parent view. The
491 | * callback's
492 | * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#onEdgeTouched(int, int)}
493 | * and
494 | * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#onEdgeDragStarted(int, int)}
495 | * methods will only be invoked for edges for which edge tracking has been
496 | * enabled.
497 | *
498 | * @param edgeFlags Combination of edge flags describing the edges to watch
499 | * @see #EDGE_LEFT
500 | * @see #EDGE_TOP
501 | * @see #EDGE_RIGHT
502 | * @see #EDGE_BOTTOM
503 | */
504 | public void setEdgeTrackingEnabled(int edgeFlags) {
505 | mTrackingEdges = edgeFlags;
506 | }
507 |
508 | /**
509 | * Return the size of an edge. This is the range in pixels along the edges
510 | * of this view that will actively detect edge touches or drags if edge
511 | * tracking is enabled.
512 | *
513 | * @return The size of an edge in pixels
514 | * @see #setEdgeTrackingEnabled(int)
515 | */
516 | public int getEdgeSize() {
517 | return mEdgeSize;
518 | }
519 |
520 | /**
521 | * Set the size of an edge. This is the range in pixels along the edges of
522 | * this view that will actively detect edge touches or drags if edge
523 | * tracking is enabled.
524 | *
525 | * @param size The size of an edge in pixels
526 | */
527 | public void setEdgeSize(int size) {
528 | mEdgeSize = size;
529 | }
530 |
531 | /**
532 | * Capture a specific child view for dragging within the parent. The
533 | * callback will be notified but
534 | * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#tryCaptureView(android.view.View, int)}
535 | * will not be asked permission to capture this view.
536 | *
537 | * @param childView Child view to capture
538 | * @param activePointerId ID of the pointer that is dragging the captured
539 | * child view
540 | */
541 | public void captureChildView(View childView, int activePointerId) {
542 | if (childView.getParent() != mParentView) {
543 | throw new IllegalArgumentException("captureChildView: parameter must be a descendant "
544 | + "of the ViewDragHelper's tracked parent view (" + mParentView + ")");
545 | }
546 |
547 | mCapturedView = childView;
548 | mActivePointerId = activePointerId;
549 | mCallback.onViewCaptured(childView, activePointerId);
550 | setDragState(STATE_DRAGGING);
551 | }
552 |
553 | /**
554 | * @return The currently captured view, or null if no view has been
555 | * captured.
556 | */
557 | public View getCapturedView() {
558 | return mCapturedView;
559 | }
560 |
561 | /**
562 | * @return The ID of the pointer currently dragging the captured view, or
563 | * {@link #INVALID_POINTER}.
564 | */
565 | public int getActivePointerId() {
566 | return mActivePointerId;
567 | }
568 |
569 | /**
570 | * @return The minimum distance in pixels that the user must travel to
571 | * initiate a drag
572 | */
573 | public int getTouchSlop() {
574 | return mTouchSlop;
575 | }
576 |
577 | /**
578 | * The result of a call to this method is equivalent to
579 | * {@link #processTouchEvent(android.view.MotionEvent)} receiving an
580 | * ACTION_CANCEL event.
581 | */
582 | public void cancel() {
583 | mActivePointerId = INVALID_POINTER;
584 | clearMotionHistory();
585 |
586 | if (mVelocityTracker != null) {
587 | mVelocityTracker.recycle();
588 | mVelocityTracker = null;
589 | }
590 | }
591 |
592 | /**
593 | * {@link #cancel()}, but also abort all motion in progress and snap to the
594 | * end of any animation.
595 | */
596 | public void abort() {
597 | cancel();
598 | if (mDragState == STATE_SETTLING) {
599 | final int oldX = mScroller.getCurrX();
600 | final int oldY = mScroller.getCurrY();
601 | mScroller.abortAnimation();
602 | final int newX = mScroller.getCurrX();
603 | final int newY = mScroller.getCurrY();
604 | mCallback.onViewPositionChanged(mCapturedView, newX, newY, newX - oldX, newY - oldY);
605 | }
606 | setDragState(STATE_IDLE);
607 | }
608 |
609 | /**
610 | * Animate the view child to the given (left, top) position. If
611 | * this method returns true, the caller should invoke
612 | * {@link #continueSettling(boolean)} on each subsequent frame to continue
613 | * the motion until it returns false. If this method returns false there is
614 | * no further work to do to complete the movement.
615 | *
616 | * This operation does not count as a capture event, though
617 | * {@link #getCapturedView()} will still report the sliding view while the
618 | * slide is in progress.
619 | *
620 | *
621 | * @param child Child view to capture and animate
622 | * @param finalLeft Final left position of child
623 | * @param finalTop Final top position of child
624 | * @return true if animation should continue through
625 | * {@link #continueSettling(boolean)} calls
626 | */
627 | public boolean smoothSlideViewTo(View child, int finalLeft, int finalTop) {
628 | mCapturedView = child;
629 | mActivePointerId = INVALID_POINTER;
630 |
631 | return forceSettleCapturedViewAt(finalLeft, finalTop, 0, 0);
632 | }
633 |
634 | /**
635 | * Settle the captured view at the given (left, top) position. The
636 | * appropriate velocity from prior motion will be taken into account. If
637 | * this method returns true, the caller should invoke
638 | * {@link #continueSettling(boolean)} on each subsequent frame to continue
639 | * the motion until it returns false. If this method returns false there is
640 | * no further work to do to complete the movement.
641 | *
642 | * @param finalLeft Settled left edge position for the captured view
643 | * @param finalTop Settled top edge position for the captured view
644 | * @return true if animation should continue through
645 | * {@link #continueSettling(boolean)} calls
646 | */
647 | public boolean settleCapturedViewAt(int finalLeft, int finalTop) {
648 | if (!mReleaseInProgress) {
649 | throw new IllegalStateException("Cannot settleCapturedViewAt outside of a call to "
650 | + "Callback#onViewReleased");
651 | }
652 |
653 | return forceSettleCapturedViewAt(finalLeft, finalTop,
654 | (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),
655 | (int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId));
656 | }
657 |
658 | /**
659 | * Settle the captured view at the given (left, top) position.
660 | *
661 | * @param finalLeft Target left position for the captured view
662 | * @param finalTop Target top position for the captured view
663 | * @param xvel Horizontal velocity
664 | * @param yvel Vertical velocity
665 | * @return true if animation should continue through
666 | * {@link #continueSettling(boolean)} calls
667 | */
668 | private boolean forceSettleCapturedViewAt(int finalLeft, int finalTop, int xvel, int yvel) {
669 | final int startLeft = mCapturedView.getLeft();
670 | final int startTop = mCapturedView.getTop();
671 | final int dx = finalLeft - startLeft;
672 | final int dy = finalTop - startTop;
673 |
674 | if (dx == 0 && dy == 0) {
675 | // Nothing to do. Send callbacks, be done.
676 | mScroller.abortAnimation();
677 | setDragState(STATE_IDLE);
678 | return false;
679 | }
680 |
681 | final int duration = computeSettleDuration(mCapturedView, dx, dy, xvel, yvel);
682 | mScroller.startScroll(startLeft, startTop, dx, dy, duration);
683 |
684 | setDragState(STATE_SETTLING);
685 | return true;
686 | }
687 |
688 | private int computeSettleDuration(View child, int dx, int dy, int xvel, int yvel) {
689 | xvel = clampMag(xvel, (int) mMinVelocity, (int) mMaxVelocity);
690 | yvel = clampMag(yvel, (int) mMinVelocity, (int) mMaxVelocity);
691 | final int absDx = Math.abs(dx);
692 | final int absDy = Math.abs(dy);
693 | final int absXVel = Math.abs(xvel);
694 | final int absYVel = Math.abs(yvel);
695 | final int addedVel = absXVel + absYVel;
696 | final int addedDistance = absDx + absDy;
697 |
698 | final float xweight = xvel != 0 ? (float) absXVel / addedVel : (float) absDx
699 | / addedDistance;
700 | final float yweight = yvel != 0 ? (float) absYVel / addedVel : (float) absDy
701 | / addedDistance;
702 |
703 | int xduration = computeAxisDuration(dx, xvel, mCallback.getViewHorizontalDragRange(child));
704 | int yduration = computeAxisDuration(dy, yvel, mCallback.getViewVerticalDragRange(child));
705 |
706 | return (int) (xduration * xweight + yduration * yweight);
707 | }
708 |
709 | private int computeAxisDuration(int delta, int velocity, int motionRange) {
710 | if (delta == 0) {
711 | return 0;
712 | }
713 |
714 | final int width = mParentView.getWidth();
715 | final int halfWidth = width / 2;
716 | final float distanceRatio = Math.min(1f, (float) Math.abs(delta) / width);
717 | final float distance = halfWidth + halfWidth
718 | * distanceInfluenceForSnapDuration(distanceRatio);
719 |
720 | int duration;
721 | velocity = Math.abs(velocity);
722 | if (velocity > 0) {
723 | duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
724 | } else {
725 | final float range = (float) Math.abs(delta) / motionRange;
726 | duration = (int) ((range + 1) * BASE_SETTLE_DURATION);
727 | }
728 | return Math.min(duration, MAX_SETTLE_DURATION);
729 | }
730 |
731 | /**
732 | * Clamp the magnitude of value for absMin and absMax. If the value is below
733 | * the minimum, it will be clamped to zero. If the value is above the
734 | * maximum, it will be clamped to the maximum.
735 | *
736 | * @param value Value to clamp
737 | * @param absMin Absolute value of the minimum significant value to return
738 | * @param absMax Absolute value of the maximum value to return
739 | * @return The clamped value with the same sign as value
740 | */
741 | private int clampMag(int value, int absMin, int absMax) {
742 | final int absValue = Math.abs(value);
743 | if (absValue < absMin)
744 | return 0;
745 | if (absValue > absMax)
746 | return value > 0 ? absMax : -absMax;
747 | return value;
748 | }
749 |
750 | /**
751 | * Clamp the magnitude of value for absMin and absMax. If the value is below
752 | * the minimum, it will be clamped to zero. If the value is above the
753 | * maximum, it will be clamped to the maximum.
754 | *
755 | * @param value Value to clamp
756 | * @param absMin Absolute value of the minimum significant value to return
757 | * @param absMax Absolute value of the maximum value to return
758 | * @return The clamped value with the same sign as value
759 | */
760 | private float clampMag(float value, float absMin, float absMax) {
761 | final float absValue = Math.abs(value);
762 | if (absValue < absMin)
763 | return 0;
764 | if (absValue > absMax)
765 | return value > 0 ? absMax : -absMax;
766 | return value;
767 | }
768 |
769 | private float distanceInfluenceForSnapDuration(float f) {
770 | f -= 0.5f; // center the values about 0.
771 | f *= 0.3f * Math.PI / 2.0f;
772 | return (float) Math.sin(f);
773 | }
774 |
775 | /**
776 | * Settle the captured view based on standard free-moving fling behavior.
777 | * The caller should invoke {@link #continueSettling(boolean)} on each
778 | * subsequent frame to continue the motion until it returns false.
779 | *
780 | * @param minLeft Minimum X position for the view's left edge
781 | * @param minTop Minimum Y position for the view's top edge
782 | * @param maxLeft Maximum X position for the view's left edge
783 | * @param maxTop Maximum Y position for the view's top edge
784 | */
785 | public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop) {
786 | if (!mReleaseInProgress) {
787 | throw new IllegalStateException("Cannot flingCapturedView outside of a call to "
788 | + "Callback#onViewReleased");
789 | }
790 |
791 | mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(),
792 | (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),
793 | (int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId),
794 | minLeft, maxLeft, minTop, maxTop);
795 |
796 | setDragState(STATE_SETTLING);
797 | }
798 |
799 | /**
800 | * Move the captured settling view by the appropriate amount for the current
801 | * time. If continueSettling returns true, the caller should
802 | * call it again on the next frame to continue.
803 | *
804 | * @param deferCallbacks true if state callbacks should be deferred via
805 | * posted message. Set this to true if you are calling this
806 | * method from {@link android.view.View#computeScroll()} or
807 | * similar methods invoked as part of layout or drawing.
808 | * @return true if settle is still in progress
809 | */
810 | public boolean continueSettling(boolean deferCallbacks) {
811 | if (mDragState == STATE_SETTLING) {
812 | boolean keepGoing = mScroller.computeScrollOffset();
813 | final int x = mScroller.getCurrX();
814 | final int y = mScroller.getCurrY();
815 | final int dx = x - mCapturedView.getLeft();
816 | final int dy = y - mCapturedView.getTop();
817 |
818 | if (dx != 0) {
819 | mCapturedView.offsetLeftAndRight(dx);
820 | }
821 | if (dy != 0) {
822 | mCapturedView.offsetTopAndBottom(dy);
823 | }
824 |
825 | if (dx != 0 || dy != 0) {
826 | mCallback.onViewPositionChanged(mCapturedView, x, y, dx, dy);
827 | }
828 |
829 | if (keepGoing && x == mScroller.getFinalX() && y == mScroller.getFinalY()) {
830 | // Close enough. The interpolator/scroller might think we're
831 | // still moving
832 | // but the user sure doesn't.
833 | mScroller.abortAnimation();
834 | keepGoing = mScroller.isFinished();
835 | }
836 |
837 | if (!keepGoing) {
838 | if (deferCallbacks) {
839 | mParentView.post(mSetIdleRunnable);
840 | } else {
841 | setDragState(STATE_IDLE);
842 | }
843 | }
844 | }
845 |
846 | return mDragState == STATE_SETTLING;
847 | }
848 |
849 | /**
850 | * Like all callback events this must happen on the UI thread, but release
851 | * involves some extra semantics. During a release (mReleaseInProgress) is
852 | * the only time it is valid to call {@link #settleCapturedViewAt(int, int)}
853 | * or {@link #flingCapturedView(int, int, int, int)}.
854 | */
855 | private void dispatchViewReleased(float xvel, float yvel) {
856 | mReleaseInProgress = true;
857 | mCallback.onViewReleased(mCapturedView, xvel, yvel);
858 | mReleaseInProgress = false;
859 |
860 | if (mDragState == STATE_DRAGGING) {
861 | // onViewReleased didn't call a method that would have changed this.
862 | // Go idle.
863 | setDragState(STATE_IDLE);
864 | }
865 | }
866 |
867 | private void clearMotionHistory() {
868 | if (mInitialMotionX == null) {
869 | return;
870 | }
871 | Arrays.fill(mInitialMotionX, 0);
872 | Arrays.fill(mInitialMotionY, 0);
873 | Arrays.fill(mLastMotionX, 0);
874 | Arrays.fill(mLastMotionY, 0);
875 | Arrays.fill(mInitialEdgeTouched, 0);
876 | Arrays.fill(mEdgeDragsInProgress, 0);
877 | Arrays.fill(mEdgeDragsLocked, 0);
878 | mPointersDown = 0;
879 | }
880 |
881 | private void clearMotionHistory(int pointerId) {
882 | if (mInitialMotionX == null) {
883 | return;
884 | }
885 | mInitialMotionX[pointerId] = 0;
886 | mInitialMotionY[pointerId] = 0;
887 | mLastMotionX[pointerId] = 0;
888 | mLastMotionY[pointerId] = 0;
889 | mInitialEdgeTouched[pointerId] = 0;
890 | mEdgeDragsInProgress[pointerId] = 0;
891 | mEdgeDragsLocked[pointerId] = 0;
892 | mPointersDown &= ~(1 << pointerId);
893 | }
894 |
895 | private void ensureMotionHistorySizeForId(int pointerId) {
896 | if (mInitialMotionX == null || mInitialMotionX.length <= pointerId) {
897 | float[] imx = new float[pointerId + 1];
898 | float[] imy = new float[pointerId + 1];
899 | float[] lmx = new float[pointerId + 1];
900 | float[] lmy = new float[pointerId + 1];
901 | int[] iit = new int[pointerId + 1];
902 | int[] edip = new int[pointerId + 1];
903 | int[] edl = new int[pointerId + 1];
904 |
905 | if (mInitialMotionX != null) {
906 | System.arraycopy(mInitialMotionX, 0, imx, 0, mInitialMotionX.length);
907 | System.arraycopy(mInitialMotionY, 0, imy, 0, mInitialMotionY.length);
908 | System.arraycopy(mLastMotionX, 0, lmx, 0, mLastMotionX.length);
909 | System.arraycopy(mLastMotionY, 0, lmy, 0, mLastMotionY.length);
910 | System.arraycopy(mInitialEdgeTouched, 0, iit, 0, mInitialEdgeTouched.length);
911 | System.arraycopy(mEdgeDragsInProgress, 0, edip, 0, mEdgeDragsInProgress.length);
912 | System.arraycopy(mEdgeDragsLocked, 0, edl, 0, mEdgeDragsLocked.length);
913 | }
914 |
915 | mInitialMotionX = imx;
916 | mInitialMotionY = imy;
917 | mLastMotionX = lmx;
918 | mLastMotionY = lmy;
919 | mInitialEdgeTouched = iit;
920 | mEdgeDragsInProgress = edip;
921 | mEdgeDragsLocked = edl;
922 | }
923 | }
924 |
925 | private void saveInitialMotion(float x, float y, int pointerId) {
926 | ensureMotionHistorySizeForId(pointerId);
927 | mInitialMotionX[pointerId] = mLastMotionX[pointerId] = x;
928 | mInitialMotionY[pointerId] = mLastMotionY[pointerId] = y;
929 | mInitialEdgeTouched[pointerId] = getEdgeTouched((int) x, (int) y);
930 | mPointersDown |= 1 << pointerId;
931 | }
932 |
933 | private void saveLastMotion(MotionEvent ev) {
934 | final int pointerCount = MotionEventCompat.getPointerCount(ev);
935 | for (int i = 0; i < pointerCount; i++) {
936 | final int pointerId = MotionEventCompat.getPointerId(ev, i);
937 | final float x = MotionEventCompat.getX(ev, i);
938 | final float y = MotionEventCompat.getY(ev, i);
939 | mLastMotionX[pointerId] = x;
940 | mLastMotionY[pointerId] = y;
941 | }
942 | }
943 |
944 | /**
945 | * Check if the given pointer ID represents a pointer that is currently down
946 | * (to the best of the ViewDragHelper's knowledge).
947 | *
948 | * The state used to report this information is populated by the methods
949 | * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or
950 | * {@link #processTouchEvent(android.view.MotionEvent)}. If one of these
951 | * methods has not been called for all relevant MotionEvents to track, the
952 | * information reported by this method may be stale or incorrect.
953 | *
954 | *
955 | * @param pointerId pointer ID to check; corresponds to IDs provided by
956 | * MotionEvent
957 | * @return true if the pointer with the given ID is still down
958 | */
959 | public boolean isPointerDown(int pointerId) {
960 | return (mPointersDown & 1 << pointerId) != 0;
961 | }
962 |
963 | void setDragState(int state) {
964 | if (mDragState != state) {
965 | mDragState = state;
966 | mCallback.onViewDragStateChanged(state);
967 | if (state == STATE_IDLE) {
968 | mCapturedView = null;
969 | }
970 | }
971 | }
972 |
973 | /**
974 | * Attempt to capture the view with the given pointer ID. The callback will
975 | * be involved. This will put us into the "dragging" state. If we've already
976 | * captured this view with this pointer this method will immediately return
977 | * true without consulting the callback.
978 | *
979 | * @param toCapture View to capture
980 | * @param pointerId Pointer to capture with
981 | * @return true if capture was successful
982 | */
983 | boolean tryCaptureViewForDrag(View toCapture, int pointerId) {
984 | if (toCapture == mCapturedView && mActivePointerId == pointerId) {
985 | // Already done!
986 | return true;
987 | }
988 | if (toCapture != null && mCallback.tryCaptureView(toCapture, pointerId)) {
989 | mActivePointerId = pointerId;
990 | captureChildView(toCapture, pointerId);
991 | return true;
992 | }
993 | return false;
994 | }
995 |
996 | /**
997 | * Tests scrollability within child views of v given a delta of dx.
998 | *
999 | * @param v View to test for horizontal scrollability
1000 | * @param checkV Whether the view v passed should itself be checked for
1001 | * scrollability (true), or just its children (false).
1002 | * @param dx Delta scrolled in pixels along the X axis
1003 | * @param dy Delta scrolled in pixels along the Y axis
1004 | * @param x X coordinate of the active touch point
1005 | * @param y Y coordinate of the active touch point
1006 | * @return true if child views of v can be scrolled by delta of dx.
1007 | */
1008 | protected boolean canScroll(View v, boolean checkV, int dx, int dy, int x, int y) {
1009 | if (v instanceof ViewGroup) {
1010 | final ViewGroup group = (ViewGroup) v;
1011 | final int scrollX = v.getScrollX();
1012 | final int scrollY = v.getScrollY();
1013 | final int count = group.getChildCount();
1014 | // Count backwards - let topmost views consume scroll distance
1015 | // first.
1016 | for (int i = count - 1; i >= 0; i--) {
1017 | // TODO: Add versioned support here for transformed views.
1018 | // This will not work for transformed views in Honeycomb+
1019 | final View child = group.getChildAt(i);
1020 | if (x + scrollX >= child.getLeft()
1021 | && x + scrollX < child.getRight()
1022 | && y + scrollY >= child.getTop()
1023 | && y + scrollY < child.getBottom()
1024 | && canScroll(child, true, dx, dy, x + scrollX - child.getLeft(), y
1025 | + scrollY - child.getTop())) {
1026 | return true;
1027 | }
1028 | }
1029 | }
1030 |
1031 | return checkV
1032 | && (ViewCompat.canScrollHorizontally(v, -dx) || ViewCompat.canScrollVertically(v,
1033 | -dy));
1034 | }
1035 |
1036 | /**
1037 | * Check if this event as provided to the parent view's
1038 | * onInterceptTouchEvent should cause the parent to intercept the touch
1039 | * event stream.
1040 | *
1041 | * @param ev MotionEvent provided to onInterceptTouchEvent
1042 | * @return true if the parent view should return true from
1043 | * onInterceptTouchEvent
1044 | */
1045 | public boolean shouldInterceptTouchEvent(MotionEvent ev) {
1046 | final int action = MotionEventCompat.getActionMasked(ev);
1047 | final int actionIndex = MotionEventCompat.getActionIndex(ev);
1048 |
1049 | if (action == MotionEvent.ACTION_DOWN) {
1050 | // Reset things for a new event stream, just in case we didn't get
1051 | // the whole previous stream.
1052 | cancel();
1053 | }
1054 |
1055 | if (mVelocityTracker == null) {
1056 | mVelocityTracker = VelocityTracker.obtain();
1057 | }
1058 | mVelocityTracker.addMovement(ev);
1059 |
1060 | switch (action) {
1061 | case MotionEvent.ACTION_DOWN: {
1062 | final float x = ev.getX();
1063 | final float y = ev.getY();
1064 | final int pointerId = MotionEventCompat.getPointerId(ev, 0);
1065 | saveInitialMotion(x, y, pointerId);
1066 |
1067 | final View toCapture = findTopChildUnder((int) x, (int) y);
1068 |
1069 | // Catch a settling view if possible.
1070 | if (toCapture == mCapturedView && mDragState == STATE_SETTLING) {
1071 | tryCaptureViewForDrag(toCapture, pointerId);
1072 | }
1073 |
1074 | final int edgesTouched = mInitialEdgeTouched[pointerId];
1075 | if ((edgesTouched & mTrackingEdges) != 0) {
1076 | mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
1077 | }
1078 | break;
1079 | }
1080 |
1081 | case MotionEventCompat.ACTION_POINTER_DOWN: {
1082 | final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
1083 | final float x = MotionEventCompat.getX(ev, actionIndex);
1084 | final float y = MotionEventCompat.getY(ev, actionIndex);
1085 |
1086 | saveInitialMotion(x, y, pointerId);
1087 |
1088 | // A ViewDragHelper can only manipulate one view at a time.
1089 | if (mDragState == STATE_IDLE) {
1090 | final int edgesTouched = mInitialEdgeTouched[pointerId];
1091 | if ((edgesTouched & mTrackingEdges) != 0) {
1092 | mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
1093 | }
1094 | } else if (mDragState == STATE_SETTLING) {
1095 | // Catch a settling view if possible.
1096 | final View toCapture = findTopChildUnder((int) x, (int) y);
1097 | if (toCapture == mCapturedView) {
1098 | tryCaptureViewForDrag(toCapture, pointerId);
1099 | }
1100 | }
1101 | break;
1102 | }
1103 |
1104 | case MotionEvent.ACTION_MOVE: {
1105 | // First to cross a touch slop over a draggable view wins. Also
1106 | // report edge drags.
1107 | final int pointerCount = MotionEventCompat.getPointerCount(ev);
1108 | for (int i = 0; i < pointerCount; i++) {
1109 | final int pointerId = MotionEventCompat.getPointerId(ev, i);
1110 | final float x = MotionEventCompat.getX(ev, i);
1111 | final float y = MotionEventCompat.getY(ev, i);
1112 | final float dx = x - mInitialMotionX[pointerId];
1113 | final float dy = y - mInitialMotionY[pointerId];
1114 |
1115 | reportNewEdgeDrags(dx, dy, pointerId);
1116 | if (mDragState == STATE_DRAGGING) {
1117 | // Callback might have started an edge drag
1118 | break;
1119 | }
1120 |
1121 | final View toCapture = findTopChildUnder((int) x, (int) y);
1122 | if (toCapture != null && checkTouchSlop(toCapture, dx, dy)
1123 | && tryCaptureViewForDrag(toCapture, pointerId)) {
1124 | break;
1125 | }
1126 | }
1127 | saveLastMotion(ev);
1128 | break;
1129 | }
1130 |
1131 | case MotionEventCompat.ACTION_POINTER_UP: {
1132 | final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
1133 | clearMotionHistory(pointerId);
1134 | break;
1135 | }
1136 |
1137 | case MotionEvent.ACTION_UP:
1138 | case MotionEvent.ACTION_CANCEL: {
1139 | cancel();
1140 | break;
1141 | }
1142 | }
1143 |
1144 | return mDragState == STATE_DRAGGING;
1145 | }
1146 |
1147 | /**
1148 | * Process a touch event received by the parent view. This method will
1149 | * dispatch callback events as needed before returning. The parent view's
1150 | * onTouchEvent implementation should call this.
1151 | *
1152 | * @param ev The touch event received by the parent view
1153 | */
1154 | public void processTouchEvent(MotionEvent ev) {
1155 | final int action = MotionEventCompat.getActionMasked(ev);
1156 | final int actionIndex = MotionEventCompat.getActionIndex(ev);
1157 |
1158 | if (action == MotionEvent.ACTION_DOWN) {
1159 | // Reset things for a new event stream, just in case we didn't get
1160 | // the whole previous stream.
1161 | cancel();
1162 | }
1163 |
1164 | if (mVelocityTracker == null) {
1165 | mVelocityTracker = VelocityTracker.obtain();
1166 | }
1167 | mVelocityTracker.addMovement(ev);
1168 |
1169 | switch (action) {
1170 | case MotionEvent.ACTION_DOWN: {
1171 | final float x = ev.getX();
1172 | final float y = ev.getY();
1173 | final int pointerId = MotionEventCompat.getPointerId(ev, 0);
1174 | final View toCapture = findTopChildUnder((int) x, (int) y);
1175 |
1176 | saveInitialMotion(x, y, pointerId);
1177 |
1178 | // Since the parent is already directly processing this touch
1179 | // event,
1180 | // there is no reason to delay for a slop before dragging.
1181 | // Start immediately if possible.
1182 | tryCaptureViewForDrag(toCapture, pointerId);
1183 |
1184 | final int edgesTouched = mInitialEdgeTouched[pointerId];
1185 | if ((edgesTouched & mTrackingEdges) != 0) {
1186 | mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
1187 | }
1188 | break;
1189 | }
1190 |
1191 | case MotionEventCompat.ACTION_POINTER_DOWN: {
1192 | final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
1193 | final float x = MotionEventCompat.getX(ev, actionIndex);
1194 | final float y = MotionEventCompat.getY(ev, actionIndex);
1195 |
1196 | saveInitialMotion(x, y, pointerId);
1197 |
1198 | // A ViewDragHelper can only manipulate one view at a time.
1199 | if (mDragState == STATE_IDLE) {
1200 | // If we're idle we can do anything! Treat it like a normal
1201 | // down event.
1202 |
1203 | final View toCapture = findTopChildUnder((int) x, (int) y);
1204 | tryCaptureViewForDrag(toCapture, pointerId);
1205 |
1206 | final int edgesTouched = mInitialEdgeTouched[pointerId];
1207 | if ((edgesTouched & mTrackingEdges) != 0) {
1208 | mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
1209 | }
1210 | } else if (isCapturedViewUnder((int) x, (int) y)) {
1211 | // We're still tracking a captured view. If the same view is
1212 | // under this
1213 | // point, we'll swap to controlling it with this pointer
1214 | // instead.
1215 | // (This will still work if we're "catching" a settling
1216 | // view.)
1217 |
1218 | tryCaptureViewForDrag(mCapturedView, pointerId);
1219 | }
1220 | break;
1221 | }
1222 |
1223 | case MotionEvent.ACTION_MOVE: {
1224 | if (mDragState == STATE_DRAGGING) {
1225 | final int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
1226 | final float x = MotionEventCompat.getX(ev, index);
1227 | final float y = MotionEventCompat.getY(ev, index);
1228 | final int idx = (int) (x - mLastMotionX[mActivePointerId]);
1229 | final int idy = (int) (y - mLastMotionY[mActivePointerId]);
1230 |
1231 | dragTo(mCapturedView.getLeft() + idx, mCapturedView.getTop() + idy, idx, idy);
1232 |
1233 | saveLastMotion(ev);
1234 | } else {
1235 | // Check to see if any pointer is now over a draggable view.
1236 | final int pointerCount = MotionEventCompat.getPointerCount(ev);
1237 | for (int i = 0; i < pointerCount; i++) {
1238 | final int pointerId = MotionEventCompat.getPointerId(ev, i);
1239 | final float x = MotionEventCompat.getX(ev, i);
1240 | final float y = MotionEventCompat.getY(ev, i);
1241 | final float dx = x - mInitialMotionX[pointerId];
1242 | final float dy = y - mInitialMotionY[pointerId];
1243 |
1244 | reportNewEdgeDrags(dx, dy, pointerId);
1245 | if (mDragState == STATE_DRAGGING) {
1246 | // Callback might have started an edge drag.
1247 | break;
1248 | }
1249 |
1250 | final View toCapture = findTopChildUnder((int) x, (int) y);
1251 | if (checkTouchSlop(toCapture, dx, dy)
1252 | && tryCaptureViewForDrag(toCapture, pointerId)) {
1253 | break;
1254 | }
1255 | }
1256 | saveLastMotion(ev);
1257 | }
1258 | break;
1259 | }
1260 |
1261 | case MotionEventCompat.ACTION_POINTER_UP: {
1262 | final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
1263 | if (mDragState == STATE_DRAGGING && pointerId == mActivePointerId) {
1264 | // Try to find another pointer that's still holding on to
1265 | // the captured view.
1266 | int newActivePointer = INVALID_POINTER;
1267 | final int pointerCount = MotionEventCompat.getPointerCount(ev);
1268 | for (int i = 0; i < pointerCount; i++) {
1269 | final int id = MotionEventCompat.getPointerId(ev, i);
1270 | if (id == mActivePointerId) {
1271 | // This one's going away, skip.
1272 | continue;
1273 | }
1274 |
1275 | final float x = MotionEventCompat.getX(ev, i);
1276 | final float y = MotionEventCompat.getY(ev, i);
1277 | if (findTopChildUnder((int) x, (int) y) == mCapturedView
1278 | && tryCaptureViewForDrag(mCapturedView, id)) {
1279 | newActivePointer = mActivePointerId;
1280 | break;
1281 | }
1282 | }
1283 |
1284 | if (newActivePointer == INVALID_POINTER) {
1285 | // We didn't find another pointer still touching the
1286 | // view, release it.
1287 | releaseViewForPointerUp();
1288 | }
1289 | }
1290 | clearMotionHistory(pointerId);
1291 | break;
1292 | }
1293 |
1294 | case MotionEvent.ACTION_UP: {
1295 | if (mDragState == STATE_DRAGGING) {
1296 | releaseViewForPointerUp();
1297 | }
1298 | cancel();
1299 | break;
1300 | }
1301 |
1302 | case MotionEvent.ACTION_CANCEL: {
1303 | if (mDragState == STATE_DRAGGING) {
1304 | dispatchViewReleased(0, 0);
1305 | }
1306 | cancel();
1307 | break;
1308 | }
1309 | }
1310 | }
1311 |
1312 | private void reportNewEdgeDrags(float dx, float dy, int pointerId) {
1313 | int dragsStarted = 0;
1314 | if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_LEFT)) {
1315 | dragsStarted |= EDGE_LEFT;
1316 | }
1317 | if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_TOP)) {
1318 | dragsStarted |= EDGE_TOP;
1319 | }
1320 | if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_RIGHT)) {
1321 | dragsStarted |= EDGE_RIGHT;
1322 | }
1323 | if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_BOTTOM)) {
1324 | dragsStarted |= EDGE_BOTTOM;
1325 | }
1326 |
1327 | if (dragsStarted != 0) {
1328 | mEdgeDragsInProgress[pointerId] |= dragsStarted;
1329 | mCallback.onEdgeDragStarted(dragsStarted, pointerId);
1330 | }
1331 | }
1332 |
1333 | private boolean checkNewEdgeDrag(float delta, float odelta, int pointerId, int edge) {
1334 | final float absDelta = Math.abs(delta);
1335 | final float absODelta = Math.abs(odelta);
1336 |
1337 | if ((mInitialEdgeTouched[pointerId] & edge) != edge || (mTrackingEdges & edge) == 0
1338 | || (mEdgeDragsLocked[pointerId] & edge) == edge
1339 | || (mEdgeDragsInProgress[pointerId] & edge) == edge
1340 | || (absDelta <= mTouchSlop && absODelta <= mTouchSlop)) {
1341 | return false;
1342 | }
1343 | if (absDelta < absODelta * 0.5f && mCallback.onEdgeLock(edge)) {
1344 | mEdgeDragsLocked[pointerId] |= edge;
1345 | return false;
1346 | }
1347 | return (mEdgeDragsInProgress[pointerId] & edge) == 0 && absDelta > mTouchSlop;
1348 | }
1349 |
1350 | /**
1351 | * Check if we've crossed a reasonable touch slop for the given child view.
1352 | * If the child cannot be dragged along the horizontal or vertical axis,
1353 | * motion along that axis will not count toward the slop check.
1354 | *
1355 | * @param child Child to check
1356 | * @param dx Motion since initial position along X axis
1357 | * @param dy Motion since initial position along Y axis
1358 | * @return true if the touch slop has been crossed
1359 | */
1360 | private boolean checkTouchSlop(View child, float dx, float dy) {
1361 | if (child == null) {
1362 | return false;
1363 | }
1364 | final boolean checkHorizontal = mCallback.getViewHorizontalDragRange(child) > 0;
1365 | final boolean checkVertical = mCallback.getViewVerticalDragRange(child) > 0;
1366 |
1367 | if (checkHorizontal && checkVertical) {
1368 | return dx * dx + dy * dy > mTouchSlop * mTouchSlop;
1369 | } else if (checkHorizontal) {
1370 | return Math.abs(dx) > mTouchSlop;
1371 | } else if (checkVertical) {
1372 | return Math.abs(dy) > mTouchSlop;
1373 | }
1374 | return false;
1375 | }
1376 |
1377 | /**
1378 | * Check if any pointer tracked in the current gesture has crossed the
1379 | * required slop threshold.
1380 | *
1381 | * This depends on internal state populated by
1382 | * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or
1383 | * {@link #processTouchEvent(android.view.MotionEvent)}. You should only
1384 | * rely on the results of this method after all currently available touch
1385 | * data has been provided to one of these two methods.
1386 | *
1387 | *
1388 | * @param directions Combination of direction flags, see
1389 | * {@link #DIRECTION_HORIZONTAL}, {@link #DIRECTION_VERTICAL},
1390 | * {@link #DIRECTION_ALL}
1391 | * @return true if the slop threshold has been crossed, false otherwise
1392 | */
1393 | public boolean checkTouchSlop(int directions) {
1394 | final int count = mInitialMotionX.length;
1395 | for (int i = 0; i < count; i++) {
1396 | if (checkTouchSlop(directions, i)) {
1397 | return true;
1398 | }
1399 | }
1400 | return false;
1401 | }
1402 |
1403 | /**
1404 | * Check if the specified pointer tracked in the current gesture has crossed
1405 | * the required slop threshold.
1406 | *
1407 | * This depends on internal state populated by
1408 | * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or
1409 | * {@link #processTouchEvent(android.view.MotionEvent)}. You should only
1410 | * rely on the results of this method after all currently available touch
1411 | * data has been provided to one of these two methods.
1412 | *
1413 | *
1414 | * @param directions Combination of direction flags, see
1415 | * {@link #DIRECTION_HORIZONTAL}, {@link #DIRECTION_VERTICAL},
1416 | * {@link #DIRECTION_ALL}
1417 | * @param pointerId ID of the pointer to slop check as specified by
1418 | * MotionEvent
1419 | * @return true if the slop threshold has been crossed, false otherwise
1420 | */
1421 | public boolean checkTouchSlop(int directions, int pointerId) {
1422 | if (!isPointerDown(pointerId)) {
1423 | return false;
1424 | }
1425 |
1426 | final boolean checkHorizontal = (directions & DIRECTION_HORIZONTAL) == DIRECTION_HORIZONTAL;
1427 | final boolean checkVertical = (directions & DIRECTION_VERTICAL) == DIRECTION_VERTICAL;
1428 |
1429 | final float dx = mLastMotionX[pointerId] - mInitialMotionX[pointerId];
1430 | final float dy = mLastMotionY[pointerId] - mInitialMotionY[pointerId];
1431 |
1432 | if (checkHorizontal && checkVertical) {
1433 | return dx * dx + dy * dy > mTouchSlop * mTouchSlop;
1434 | } else if (checkHorizontal) {
1435 | return Math.abs(dx) > mTouchSlop;
1436 | } else if (checkVertical) {
1437 | return Math.abs(dy) > mTouchSlop;
1438 | }
1439 | return false;
1440 | }
1441 |
1442 | /**
1443 | * Check if any of the edges specified were initially touched in the
1444 | * currently active gesture. If there is no currently active gesture this
1445 | * method will return false.
1446 | *
1447 | * @param edges Edges to check for an initial edge touch. See
1448 | * {@link #EDGE_LEFT}, {@link #EDGE_TOP}, {@link #EDGE_RIGHT},
1449 | * {@link #EDGE_BOTTOM} and {@link #EDGE_ALL}
1450 | * @return true if any of the edges specified were initially touched in the
1451 | * current gesture
1452 | */
1453 | public boolean isEdgeTouched(int edges) {
1454 | final int count = mInitialEdgeTouched.length;
1455 | for (int i = 0; i < count; i++) {
1456 | if (isEdgeTouched(edges, i)) {
1457 | return true;
1458 | }
1459 | }
1460 | return false;
1461 | }
1462 |
1463 | /**
1464 | * Check if any of the edges specified were initially touched by the pointer
1465 | * with the specified ID. If there is no currently active gesture or if
1466 | * there is no pointer with the given ID currently down this method will
1467 | * return false.
1468 | *
1469 | * @param edges Edges to check for an initial edge touch. See
1470 | * {@link #EDGE_LEFT}, {@link #EDGE_TOP}, {@link #EDGE_RIGHT},
1471 | * {@link #EDGE_BOTTOM} and {@link #EDGE_ALL}
1472 | * @return true if any of the edges specified were initially touched in the
1473 | * current gesture
1474 | */
1475 | public boolean isEdgeTouched(int edges, int pointerId) {
1476 | return isPointerDown(pointerId) && (mInitialEdgeTouched[pointerId] & edges) != 0;
1477 | }
1478 |
1479 | private void releaseViewForPointerUp() {
1480 | mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity);
1481 | final float xvel = clampMag(
1482 | VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),
1483 | mMinVelocity, mMaxVelocity);
1484 | final float yvel = clampMag(
1485 | VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId),
1486 | mMinVelocity, mMaxVelocity);
1487 | dispatchViewReleased(xvel, yvel);
1488 | }
1489 |
1490 | private void dragTo(int left, int top, int dx, int dy) {
1491 | int clampedX = left;
1492 | int clampedY = top;
1493 | final int oldLeft = mCapturedView.getLeft();
1494 | final int oldTop = mCapturedView.getTop();
1495 | if (dx != 0) {
1496 | clampedX = mCallback.clampViewPositionHorizontal(mCapturedView, left, dx);
1497 | mCapturedView.offsetLeftAndRight(clampedX - oldLeft);
1498 | }
1499 | if (dy != 0) {
1500 | clampedY = mCallback.clampViewPositionVertical(mCapturedView, top, dy);
1501 | mCapturedView.offsetTopAndBottom(clampedY - oldTop);
1502 | }
1503 |
1504 | if (dx != 0 || dy != 0) {
1505 | final int clampedDx = clampedX - oldLeft;
1506 | final int clampedDy = clampedY - oldTop;
1507 | mCallback
1508 | .onViewPositionChanged(mCapturedView, clampedX, clampedY, clampedDx, clampedDy);
1509 | }
1510 | }
1511 |
1512 | /**
1513 | * Determine if the currently captured view is under the given point in the
1514 | * parent view's coordinate system. If there is no captured view this method
1515 | * will return false.
1516 | *
1517 | * @param x X position to test in the parent's coordinate system
1518 | * @param y Y position to test in the parent's coordinate system
1519 | * @return true if the captured view is under the given point, false
1520 | * otherwise
1521 | */
1522 | public boolean isCapturedViewUnder(int x, int y) {
1523 | return isViewUnder(mCapturedView, x, y);
1524 | }
1525 |
1526 | /**
1527 | * Determine if the supplied view is under the given point in the parent
1528 | * view's coordinate system.
1529 | *
1530 | * @param view Child view of the parent to hit test
1531 | * @param x X position to test in the parent's coordinate system
1532 | * @param y Y position to test in the parent's coordinate system
1533 | * @return true if the supplied view is under the given point, false
1534 | * otherwise
1535 | */
1536 | public boolean isViewUnder(View view, int x, int y) {
1537 | if (view == null) {
1538 | return false;
1539 | }
1540 | return x >= view.getLeft() && x < view.getRight() && y >= view.getTop()
1541 | && y < view.getBottom();
1542 | }
1543 |
1544 | /**
1545 | * Find the topmost child under the given point within the parent view's
1546 | * coordinate system. The child order is determined using
1547 | * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#getOrderedChildIndex(int)}
1548 | * .
1549 | *
1550 | * @param x X position to test in the parent's coordinate system
1551 | * @param y Y position to test in the parent's coordinate system
1552 | * @return The topmost child view under (x, y) or null if none found.
1553 | */
1554 | public View findTopChildUnder(int x, int y) {
1555 | final int childCount = mParentView.getChildCount();
1556 | for (int i = childCount - 1; i >= 0; i--) {
1557 | final View child = mParentView.getChildAt(mCallback.getOrderedChildIndex(i));
1558 | if (x >= child.getLeft() && x < child.getRight() && y >= child.getTop()
1559 | && y < child.getBottom()) {
1560 | return child;
1561 | }
1562 | }
1563 | return null;
1564 | }
1565 |
1566 | private int getEdgeTouched(int x, int y) {
1567 | int result = 0;
1568 |
1569 | if (x < mParentView.getLeft() + mEdgeSize)
1570 | result = EDGE_LEFT;
1571 | if (y < mParentView.getTop() + mEdgeSize)
1572 | result = EDGE_TOP;
1573 | if (x > mParentView.getRight() - mEdgeSize)
1574 | result = EDGE_RIGHT;
1575 | if (y > mParentView.getBottom() - mEdgeSize)
1576 | result = EDGE_BOTTOM;
1577 |
1578 | return result;
1579 | }
1580 | }
1581 |
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