├── .gitignore
├── CarouselLayoutManager
├── .gitignore
├── build.gradle
├── carousellayoutmanager
│ ├── .gitignore
│ ├── build.gradle
│ ├── proguard-rules.pro
│ ├── publish-module.gradle
│ ├── publish-root.gradle
│ └── src
│ │ └── main
│ │ ├── AndroidManifest.xml
│ │ └── java
│ │ └── com
│ │ └── mig35
│ │ └── carousellayoutmanager
│ │ ├── CarouselChildSelectionListener.java
│ │ ├── CarouselLayoutManager.java
│ │ ├── CarouselSmoothScroller.java
│ │ ├── CarouselZoomPostLayoutListener.java
│ │ ├── CenterScrollListener.java
│ │ ├── DefaultChildSelectionListener.java
│ │ └── ItemTransformation.java
├── gradle.properties
├── gradle
│ └── wrapper
│ │ ├── gradle-wrapper.jar
│ │ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── sample
│ ├── .gitignore
│ ├── build.gradle
│ ├── proguard-rules.pro
│ └── src
│ │ └── main
│ │ ├── AndroidManifest.xml
│ │ ├── java
│ │ └── com
│ │ │ └── mig35
│ │ │ └── carousellayoutmanager
│ │ │ └── sample
│ │ │ └── CarouselPreviewActivity.java
│ │ └── res
│ │ ├── layout
│ │ ├── activity_carousel_preview.xml
│ │ └── item_view.xml
│ │ ├── mipmap-hdpi
│ │ └── ic_launcher.png
│ │ ├── mipmap-mdpi
│ │ └── ic_launcher.png
│ │ ├── mipmap-xhdpi
│ │ └── ic_launcher.png
│ │ ├── mipmap-xxhdpi
│ │ └── ic_launcher.png
│ │ ├── mipmap-xxxhdpi
│ │ └── ic_launcher.png
│ │ └── values
│ │ ├── colors.xml
│ │ ├── dimens.xml
│ │ ├── strings.xml
│ │ └── styles.xml
└── settings.gradle
├── LICENSE
├── README.md
└── resources
├── carousel_double_work_small.gif
├── carousel_work.gif
├── carousel_work_small.gif
└── issues14.gif
/.gitignore:
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1 | # Built application files
2 | *.apk
3 | *.ap_
4 |
5 | # Files for the Dalvik VM
6 | *.dex
7 |
8 | # Java class files
9 | *.class
10 |
11 | # Generated files
12 | bin/
13 | gen/
14 |
15 | # Gradle files
16 | .gradle/
17 | build/
18 |
19 | # Local configuration file (sdk path, etc)
20 | local.properties
21 |
22 | # Proguard folder generated by Eclipse
23 | proguard/
24 |
25 | # Log Files
26 | *.log
27 |
28 | # Android Studio Navigation editor temp files
29 | .navigation/
30 |
31 | # Android Studio captures folder
32 | captures/
33 | /CarouselLayoutManager/.idea
34 |
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/CarouselLayoutManager/.gitignore:
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1 | *.iml
2 | .gradle
3 | /local.properties
4 | /.idea/workspace.xml
5 | /.idea/libraries
6 | .DS_Store
7 | /build
8 | /captures
9 |
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/CarouselLayoutManager/build.gradle:
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1 | buildscript {
2 | repositories {
3 | google()
4 | mavenCentral()
5 | maven {
6 | url "https://plugins.gradle.org/m2/"
7 | }
8 | }
9 | dependencies {
10 | classpath 'com.android.tools.build:gradle:4.2.1'
11 | classpath 'io.github.gradle-nexus:publish-plugin:1.1.0'
12 | }
13 | }
14 |
15 | allprojects {
16 | repositories {
17 | google()
18 | mavenCentral()
19 | }
20 | }
21 |
22 | task clean(type: Delete) {
23 | delete rootProject.buildDir
24 | }
25 |
26 | apply plugin: 'io.github.gradle-nexus.publish-plugin'
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/CarouselLayoutManager/carousellayoutmanager/.gitignore:
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1 | /build
2 |
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/CarouselLayoutManager/carousellayoutmanager/build.gradle:
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1 | buildscript {
2 | repositories {
3 | google()
4 | mavenCentral()
5 | }
6 |
7 | dependencies {
8 | classpath 'com.android.tools.build:gradle:4.2.1'
9 | classpath "com.github.dcendents:android-maven-gradle-plugin:2.1"
10 | classpath "com.github.dcendents:android-maven-plugin:1.2"
11 | classpath "org.jetbrains.dokka:dokka-android-gradle-plugin:0.9.18"
12 | }
13 | }
14 |
15 | apply plugin: "com.android.library"
16 | apply plugin: 'com.github.dcendents.android-maven'
17 |
18 | final Properties properties = new Properties()
19 | properties.load(project.rootProject.file('local.properties').newDataInputStream())
20 |
21 | android {
22 | compileSdkVersion 30
23 | resourcePrefix "carousellayoutmanager__"
24 |
25 | defaultConfig {
26 | minSdkVersion 11
27 | targetSdkVersion 30
28 | versionCode 1
29 | versionName version
30 | }
31 | buildTypes {
32 | release {
33 | minifyEnabled false
34 | proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
35 | }
36 | }
37 | }
38 |
39 | dependencies {
40 | implementation fileTree(include: ['*.jar'], dir: 'libs')
41 |
42 | implementation 'androidx.recyclerview:recyclerview:1.2.0'
43 | }
44 |
45 | ext {
46 | PUBLISH_GROUP_ID = 'com.mig35'
47 | PUBLISH_VERSION = '1.4.6'
48 | PUBLISH_ARTIFACT_ID = 'carousellayoutmanager'
49 | }
50 |
51 | apply from: "publish-root.gradle"
52 | apply from: "publish-module.gradle"
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/CarouselLayoutManager/carousellayoutmanager/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # By default, the flags in this file are appended to flags specified
3 | # in C:\Users\Mikhail\Documents\tools\android_sdk/tools/proguard/proguard-android.txt
4 | # You can edit the include path and order by changing the proguardFiles
5 | # directive in build.gradle.
6 | #
7 | # For more details, see
8 | # http://developer.android.com/guide/developing/tools/proguard.html
9 |
10 | # Add any project specific keep options here:
11 |
12 | # If your project uses WebView with JS, uncomment the following
13 | # and specify the fully qualified class name to the JavaScript interface
14 | # class:
15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
16 | # public *;
17 | #}
18 |
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/CarouselLayoutManager/carousellayoutmanager/publish-module.gradle:
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1 | apply plugin: 'maven-publish'
2 | apply plugin: 'signing'
3 | apply plugin: 'org.jetbrains.dokka'
4 |
5 | task androidSourcesJar(type: Jar) {
6 | archiveClassifier.set('sources')
7 | if (project.plugins.findPlugin("com.android.library")) {
8 | from android.sourceSets.main.java.srcDirs
9 | } else {
10 | from sourceSets.main.java.srcDirs
11 | }
12 | }
13 |
14 | //tasks.withType(dokkaHtmlPartial.getClass()).configureEach {
15 | // pluginsMapConfiguration.set(
16 | // ["org.jetbrains.dokka.base.DokkaBase": """{ "separateInheritedMembers": true}"""]
17 | // )
18 | //}
19 |
20 | task javadocJar(type: Jar) {
21 | archiveClassifier.set('javadoc')
22 | }
23 |
24 | artifacts {
25 | archives androidSourcesJar
26 | archives javadocJar
27 | }
28 |
29 | group = PUBLISH_GROUP_ID
30 | version = PUBLISH_VERSION
31 |
32 | afterEvaluate {
33 | publishing {
34 | publications {
35 | release(MavenPublication) {
36 | groupId PUBLISH_GROUP_ID
37 | artifactId PUBLISH_ARTIFACT_ID
38 | version PUBLISH_VERSION
39 | if (project.plugins.findPlugin("com.android.library")) {
40 | artifact bundleReleaseAar
41 | } else {
42 | artifact("$buildDir/libs/${project.getName()}-${version}.jar")
43 | }
44 |
45 | artifact androidSourcesJar
46 | artifact javadocJar
47 |
48 | pom {
49 | name = PUBLISH_ARTIFACT_ID
50 | description = 'Carousel Layout Manager for RecyclerView'
51 | url = 'https://github.com/Azoft/CarouselLayoutManager'
52 | licenses {
53 | license {
54 | name = 'License'
55 | url = 'https://github.com/Azoft/CarouselLayoutManager/blob/master/LICENSE'
56 | }
57 | }
58 | developers {
59 | developer {
60 | id = 'mig35'
61 | name = 'Mikhail Gurevich'
62 | email = 'mig35@mig35.com'
63 | }
64 | }
65 | scm {
66 | connection = 'scm:git:github.com/Azoft/CarouselLayoutManager.git'
67 | developerConnection = 'scm:git:ssh://github.com/Azoft/CarouselLayoutManager.git'
68 | url = 'https://github.com/Azoft/CarouselLayoutManager/tree/main'
69 | }
70 | }
71 | }
72 | }
73 | }
74 | }
75 |
76 | signing {
77 | sign publishing.publications
78 | }
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/CarouselLayoutManager/carousellayoutmanager/publish-root.gradle:
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1 | ext["signing.keyId"] = ''
2 | ext["signing.password"] = ''
3 | ext["signing.secretKeyRingFile"] = ''
4 | ext["ossrhUsername"] = ''
5 | ext["ossrhPassword"] = ''
6 | ext["sonatypeStagingProfileId"] = ''
7 |
8 | File secretPropsFile = project.rootProject.file('local.properties')
9 | if (secretPropsFile.exists()) {
10 | // Read local.properties file first if it exists
11 | Properties p = new Properties()
12 | new FileInputStream(secretPropsFile).withCloseable { is -> p.load(is) }
13 | p.each { name, value -> ext[name] = value }
14 | } else {
15 | // Use system environment variables
16 | ext["ossrhUsername"] = System.getenv('OSSRH_USERNAME')
17 | ext["ossrhPassword"] = System.getenv('OSSRH_PASSWORD')
18 | ext["sonatypeStagingProfileId"] = System.getenv('SONATYPE_STAGING_PROFILE_ID')
19 | ext["signing.keyId"] = System.getenv('SIGNING_KEY_ID')
20 | ext["signing.password"] = System.getenv('SIGNING_PASSWORD')
21 | ext["signing.secretKeyRingFile"] = System.getenv('SIGNING_SECRET_KEY_RING_FILE')
22 | }
23 |
24 | // Set up Sonatype repository
25 | nexusPublishing {
26 | repositories {
27 | sonatype {
28 | stagingProfileId = sonatypeStagingProfileId
29 | username = ossrhUsername
30 | password = ossrhPassword
31 |
32 | /* Existing params here... */
33 | nexusUrl.set(uri("https://s01.oss.sonatype.org/service/local/"))
34 | snapshotRepositoryUrl.set(uri("https://s01.oss.sonatype.org/content/repositories/snapshots/"))
35 | }
36 | }
37 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/AndroidManifest.xml:
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1 |
2 |
3 |
4 |
5 |
6 |
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/CarouselChildSelectionListener.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | import androidx.annotation.NonNull;
4 | import androidx.recyclerview.widget.RecyclerView;
5 | import android.view.View;
6 |
7 | public abstract class CarouselChildSelectionListener {
8 |
9 | @NonNull
10 | private final RecyclerView mRecyclerView;
11 | @NonNull
12 | private final CarouselLayoutManager mCarouselLayoutManager;
13 |
14 | private final View.OnClickListener mOnClickListener = new View.OnClickListener() {
15 | @Override
16 | public void onClick(final View v) {
17 | final RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
18 | final int position = holder.getAdapterPosition();
19 |
20 | if (position == mCarouselLayoutManager.getCenterItemPosition()) {
21 | onCenterItemClicked(mRecyclerView, mCarouselLayoutManager, v);
22 | } else {
23 | onBackItemClicked(mRecyclerView, mCarouselLayoutManager, v);
24 | }
25 | }
26 | };
27 |
28 | protected CarouselChildSelectionListener(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager) {
29 | mRecyclerView = recyclerView;
30 | mCarouselLayoutManager = carouselLayoutManager;
31 |
32 | mRecyclerView.addOnChildAttachStateChangeListener(new RecyclerView.OnChildAttachStateChangeListener() {
33 | @Override
34 | public void onChildViewAttachedToWindow(@NonNull final View view) {
35 | view.setOnClickListener(mOnClickListener);
36 | }
37 |
38 | @Override
39 | public void onChildViewDetachedFromWindow(@NonNull final View view) {
40 | view.setOnClickListener(null);
41 | }
42 | });
43 | }
44 |
45 | protected abstract void onCenterItemClicked(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager, @NonNull final View v);
46 |
47 | protected abstract void onBackItemClicked(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager, @NonNull final View v);
48 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/CarouselLayoutManager.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | import android.graphics.PointF;
4 | import android.os.Handler;
5 | import android.os.Looper;
6 | import android.os.Parcel;
7 | import android.os.Parcelable;
8 | import android.view.View;
9 | import android.view.ViewGroup;
10 |
11 | import java.lang.ref.WeakReference;
12 | import java.util.ArrayList;
13 | import java.util.Iterator;
14 | import java.util.List;
15 |
16 | import androidx.annotation.CallSuper;
17 | import androidx.annotation.NonNull;
18 | import androidx.annotation.Nullable;
19 | import androidx.core.view.ViewCompat;
20 | import androidx.recyclerview.widget.LinearSmoothScroller;
21 | import androidx.recyclerview.widget.OrientationHelper;
22 | import androidx.recyclerview.widget.RecyclerView;
23 |
24 | /**
25 | * An implementation of {@link RecyclerView.LayoutManager} that layout items like carousel.
26 | * Generally there is one center item and bellow this item there are maximum {@link CarouselLayoutManager#getMaxVisibleItems()} items on each side of the center
27 | * item. By default {@link CarouselLayoutManager#getMaxVisibleItems()} is {@link CarouselLayoutManager#MAX_VISIBLE_ITEMS}.
28 | *
29 | * This LayoutManager supports only fixedSized adapter items.
30 | *
31 | * This LayoutManager supports {@link CarouselLayoutManager#HORIZONTAL} and {@link CarouselLayoutManager#VERTICAL} orientations.
32 | *
33 | * This LayoutManager supports circle layout. By default it if disabled. We don't recommend to use circle layout with adapter items count less then 3.
34 | *
35 | * Please be sure that layout_width of adapter item is a constant value and not {@link ViewGroup.LayoutParams#MATCH_PARENT}
36 | * for {@link #HORIZONTAL} orientation.
37 | * So like layout_height is not {@link ViewGroup.LayoutParams#MATCH_PARENT} for {@link CarouselLayoutManager#VERTICAL}
38 | *
39 | */
40 | public class CarouselLayoutManager extends RecyclerView.LayoutManager implements RecyclerView.SmoothScroller.ScrollVectorProvider {
41 |
42 | public static final int HORIZONTAL = OrientationHelper.HORIZONTAL;
43 | public static final int VERTICAL = OrientationHelper.VERTICAL;
44 |
45 | public static final int INVALID_POSITION = -1;
46 | public static final int MAX_VISIBLE_ITEMS = 3;
47 |
48 | private static final boolean CIRCLE_LAYOUT = false;
49 |
50 | private boolean mDecoratedChildSizeInvalid;
51 | private Integer mDecoratedChildWidth;
52 | private Integer mDecoratedChildHeight;
53 |
54 | private final int mOrientation;
55 | private boolean mCircleLayout;
56 |
57 | private int mPendingScrollPosition;
58 |
59 | private final LayoutHelper mLayoutHelper = new LayoutHelper(MAX_VISIBLE_ITEMS);
60 |
61 | private PostLayoutListener mViewPostLayout;
62 |
63 | private final List mOnCenterItemSelectionListeners = new ArrayList<>();
64 | private int mCenterItemPosition = INVALID_POSITION;
65 | private int mItemsCount;
66 |
67 | @Nullable
68 | private CarouselSavedState mPendingCarouselSavedState;
69 |
70 | /**
71 | * @param orientation should be {@link #VERTICAL} or {@link #HORIZONTAL}
72 | */
73 | @SuppressWarnings("unused")
74 | public CarouselLayoutManager(final int orientation) {
75 | this(orientation, CIRCLE_LAYOUT);
76 | }
77 |
78 | /**
79 | * If circleLayout is true then all items will be in cycle. Scroll will be infinite on both sides.
80 | *
81 | * @param orientation should be {@link #VERTICAL} or {@link #HORIZONTAL}
82 | * @param circleLayout true for enabling circleLayout
83 | */
84 | @SuppressWarnings("unused")
85 | public CarouselLayoutManager(final int orientation, final boolean circleLayout) {
86 | if (HORIZONTAL != orientation && VERTICAL != orientation) {
87 | throw new IllegalArgumentException("orientation should be HORIZONTAL or VERTICAL");
88 | }
89 | mOrientation = orientation;
90 | mCircleLayout = circleLayout;
91 | mPendingScrollPosition = INVALID_POSITION;
92 | }
93 |
94 | /**
95 | * Change circle layout type
96 | */
97 | @SuppressWarnings("unused")
98 | public void setCircleLayout(final boolean circleLayout) {
99 | if (mCircleLayout != circleLayout) {
100 | mCircleLayout = circleLayout;
101 | requestLayout();
102 | }
103 | }
104 |
105 | /**
106 | * Setup {@link CarouselLayoutManager.PostLayoutListener} for this LayoutManager.
107 | * Its methods will be called for each visible view item after general LayoutManager layout finishes.
108 | *
109 | * Generally this method should be used for scaling and translating view item for better (different) view presentation of layouting.
110 | *
111 | * @param postLayoutListener listener for item layout changes. Can be null.
112 | */
113 | @SuppressWarnings("unused")
114 | public void setPostLayoutListener(@Nullable final PostLayoutListener postLayoutListener) {
115 | mViewPostLayout = postLayoutListener;
116 | requestLayout();
117 | }
118 |
119 | /**
120 | * Setup maximum visible (layout) items on each side of the center item.
121 | * Basically during scrolling there can be more visible items (+1 item on each side), but in idle state this is the only reached maximum.
122 | *
123 | * @param maxVisibleItems should be great then 0, if bot an {@link IllegalAccessException} will be thrown
124 | */
125 | @CallSuper
126 | @SuppressWarnings("unused")
127 | public void setMaxVisibleItems(final int maxVisibleItems) {
128 | if (0 > maxVisibleItems) {
129 | throw new IllegalArgumentException("maxVisibleItems can't be less then 0");
130 | }
131 | mLayoutHelper.mMaxVisibleItems = maxVisibleItems;
132 | requestLayout();
133 | }
134 |
135 | /**
136 | * @return current setup for maximum visible items.
137 | * @see #setMaxVisibleItems(int)
138 | */
139 | @SuppressWarnings("unused")
140 | public int getMaxVisibleItems() {
141 | return mLayoutHelper.mMaxVisibleItems;
142 | }
143 |
144 | @Override
145 | public RecyclerView.LayoutParams generateDefaultLayoutParams() {
146 | return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
147 | }
148 |
149 | /**
150 | * @return current layout orientation
151 | * @see #VERTICAL
152 | * @see #HORIZONTAL
153 | */
154 | public int getOrientation() {
155 | return mOrientation;
156 | }
157 |
158 | @Override
159 | public boolean canScrollHorizontally() {
160 | return 0 != getChildCount() && HORIZONTAL == mOrientation;
161 | }
162 |
163 | @Override
164 | public boolean canScrollVertically() {
165 | return 0 != getChildCount() && VERTICAL == mOrientation;
166 | }
167 |
168 | /**
169 | * @return current layout center item
170 | */
171 | public int getCenterItemPosition() {
172 | return mCenterItemPosition;
173 | }
174 |
175 | /**
176 | * @param onCenterItemSelectionListener listener that will trigger when ItemSelectionChanges. can't be null
177 | */
178 | public void addOnItemSelectionListener(@NonNull final OnCenterItemSelectionListener onCenterItemSelectionListener) {
179 | mOnCenterItemSelectionListeners.add(onCenterItemSelectionListener);
180 | }
181 |
182 | /**
183 | * @param onCenterItemSelectionListener listener that was previously added by {@link #addOnItemSelectionListener(OnCenterItemSelectionListener)}
184 | */
185 | public void removeOnItemSelectionListener(@NonNull final OnCenterItemSelectionListener onCenterItemSelectionListener) {
186 | mOnCenterItemSelectionListeners.remove(onCenterItemSelectionListener);
187 | }
188 |
189 | @SuppressWarnings("RefusedBequest")
190 | @Override
191 | public void scrollToPosition(final int position) {
192 | if (0 > position) {
193 | throw new IllegalArgumentException("position can't be less then 0. position is : " + position);
194 | }
195 | mPendingScrollPosition = position;
196 | requestLayout();
197 | }
198 |
199 | @SuppressWarnings("RefusedBequest")
200 | @Override
201 | public void smoothScrollToPosition(@NonNull final RecyclerView recyclerView, @NonNull final RecyclerView.State state, final int position) {
202 | final LinearSmoothScroller linearSmoothScroller = new LinearSmoothScroller(recyclerView.getContext()) {
203 | @Override
204 | public int calculateDyToMakeVisible(final View view, final int snapPreference) {
205 | if (!canScrollVertically()) {
206 | return 0;
207 | }
208 |
209 | return getOffsetForCurrentView(view);
210 | }
211 |
212 | @Override
213 | public int calculateDxToMakeVisible(final View view, final int snapPreference) {
214 | if (!canScrollHorizontally()) {
215 | return 0;
216 | }
217 | return getOffsetForCurrentView(view);
218 | }
219 | };
220 | linearSmoothScroller.setTargetPosition(position);
221 | startSmoothScroll(linearSmoothScroller);
222 | }
223 |
224 | @Override
225 | @Nullable
226 | public PointF computeScrollVectorForPosition(final int targetPosition) {
227 | if (0 == getChildCount()) {
228 | return null;
229 | }
230 | final float directionDistance = getScrollDirection(targetPosition);
231 | //noinspection NumericCastThatLosesPrecision
232 | final int direction = (int) -Math.signum(directionDistance);
233 |
234 | if (HORIZONTAL == mOrientation) {
235 | return new PointF(direction, 0);
236 | } else {
237 | return new PointF(0, direction);
238 | }
239 | }
240 |
241 | private float getScrollDirection(final int targetPosition) {
242 | final float currentScrollPosition = makeScrollPositionInRange0ToCount(getCurrentScrollPosition(), mItemsCount);
243 |
244 | if (mCircleLayout) {
245 | final float t1 = currentScrollPosition - targetPosition;
246 | final float t2 = Math.abs(t1) - mItemsCount;
247 | if (Math.abs(t1) > Math.abs(t2)) {
248 | return Math.signum(t1) * t2;
249 | } else {
250 | return t1;
251 | }
252 | } else {
253 | return currentScrollPosition - targetPosition;
254 | }
255 | }
256 |
257 | @Override
258 | public int scrollVerticallyBy(final int dy, @NonNull final RecyclerView.Recycler recycler, @NonNull final RecyclerView.State state) {
259 | if (HORIZONTAL == mOrientation) {
260 | return 0;
261 | }
262 | return scrollBy(dy, recycler, state);
263 | }
264 |
265 | @Override
266 | public int scrollHorizontallyBy(final int dx, final RecyclerView.Recycler recycler, final RecyclerView.State state) {
267 | if (VERTICAL == mOrientation) {
268 | return 0;
269 | }
270 | return scrollBy(dx, recycler, state);
271 | }
272 |
273 | /**
274 | * This method is called from {@link #scrollHorizontallyBy(int, RecyclerView.Recycler, RecyclerView.State)} and
275 | * {@link #scrollVerticallyBy(int, RecyclerView.Recycler, RecyclerView.State)} to calculate needed scroll that is allowed.
276 | *
277 | * This method may do relayout work.
278 | *
279 | * @param diff distance that we want to scroll by
280 | * @param recycler Recycler to use for fetching potentially cached views for a position
281 | * @param state Transient state of RecyclerView
282 | * @return distance that we actually scrolled by
283 | */
284 | @CallSuper
285 | protected int scrollBy(final int diff, @NonNull final RecyclerView.Recycler recycler, @NonNull final RecyclerView.State state) {
286 | if (null == mDecoratedChildWidth || null == mDecoratedChildHeight) {
287 | return 0;
288 | }
289 | if (0 == getChildCount() || 0 == diff) {
290 | return 0;
291 | }
292 | final int resultScroll;
293 | if (mCircleLayout) {
294 | resultScroll = diff;
295 |
296 | mLayoutHelper.mScrollOffset += resultScroll;
297 |
298 | final int maxOffset = getScrollItemSize() * mItemsCount;
299 | while (0 > mLayoutHelper.mScrollOffset) {
300 | mLayoutHelper.mScrollOffset += maxOffset;
301 | }
302 | while (mLayoutHelper.mScrollOffset > maxOffset) {
303 | mLayoutHelper.mScrollOffset -= maxOffset;
304 | }
305 |
306 | mLayoutHelper.mScrollOffset -= resultScroll;
307 | } else {
308 | final int maxOffset = getMaxScrollOffset();
309 |
310 | if (0 > mLayoutHelper.mScrollOffset + diff) {
311 | resultScroll = -mLayoutHelper.mScrollOffset; //to make it 0
312 | } else if (mLayoutHelper.mScrollOffset + diff > maxOffset) {
313 | resultScroll = maxOffset - mLayoutHelper.mScrollOffset; //to make it maxOffset
314 | } else {
315 | resultScroll = diff;
316 | }
317 | }
318 | if (0 != resultScroll) {
319 | mLayoutHelper.mScrollOffset += resultScroll;
320 | fillData(recycler, state);
321 | }
322 | return resultScroll;
323 | }
324 |
325 | @Override
326 | public void onMeasure(@NonNull final RecyclerView.Recycler recycler, @NonNull final RecyclerView.State state, final int widthSpec, final int heightSpec) {
327 | mDecoratedChildSizeInvalid = true;
328 |
329 | super.onMeasure(recycler, state, widthSpec, heightSpec);
330 | }
331 |
332 | @SuppressWarnings("rawtypes")
333 | @Override
334 | public void onAdapterChanged(final RecyclerView.Adapter oldAdapter, final RecyclerView.Adapter newAdapter) {
335 | super.onAdapterChanged(oldAdapter, newAdapter);
336 |
337 | removeAllViews();
338 | }
339 |
340 | @SuppressWarnings("RefusedBequest")
341 | @Override
342 | @CallSuper
343 | public void onLayoutChildren(@NonNull final RecyclerView.Recycler recycler, @NonNull final RecyclerView.State state) {
344 | if (0 == state.getItemCount()) {
345 | removeAndRecycleAllViews(recycler);
346 | selectItemCenterPosition(INVALID_POSITION);
347 | return;
348 | }
349 |
350 | detachAndScrapAttachedViews(recycler);
351 |
352 | if (null == mDecoratedChildWidth || mDecoratedChildSizeInvalid) {
353 | final List scrapList = recycler.getScrapList();
354 |
355 | final boolean shouldRecycle;
356 | final View view;
357 | if (scrapList.isEmpty()) {
358 | shouldRecycle = true;
359 | final int itemsCount = state.getItemCount();
360 | view = recycler.getViewForPosition(
361 | mPendingScrollPosition == INVALID_POSITION ?
362 | 0 :
363 | Math.max(0, Math.min(itemsCount - 1, mPendingScrollPosition))
364 | );
365 | addView(view);
366 | } else {
367 | shouldRecycle = false;
368 | view = scrapList.get(0).itemView;
369 | }
370 | measureChildWithMargins(view, 0, 0);
371 |
372 | final int decoratedChildWidth = getDecoratedMeasuredWidth(view);
373 | final int decoratedChildHeight = getDecoratedMeasuredHeight(view);
374 | if (shouldRecycle) {
375 | detachAndScrapView(view, recycler);
376 | }
377 |
378 | if (null != mDecoratedChildWidth && (mDecoratedChildWidth != decoratedChildWidth || mDecoratedChildHeight != decoratedChildHeight)) {
379 | if (INVALID_POSITION == mPendingScrollPosition && null == mPendingCarouselSavedState) {
380 | mPendingScrollPosition = mCenterItemPosition;
381 | }
382 | }
383 |
384 | mDecoratedChildWidth = decoratedChildWidth;
385 | mDecoratedChildHeight = decoratedChildHeight;
386 | mDecoratedChildSizeInvalid = false;
387 | }
388 |
389 | if (INVALID_POSITION != mPendingScrollPosition) {
390 | final int itemsCount = state.getItemCount();
391 | mPendingScrollPosition = 0 == itemsCount ? INVALID_POSITION : Math.max(0, Math.min(itemsCount - 1, mPendingScrollPosition));
392 | }
393 | if (INVALID_POSITION != mPendingScrollPosition) {
394 | mLayoutHelper.mScrollOffset = calculateScrollForSelectingPosition(mPendingScrollPosition, state);
395 | mPendingScrollPosition = INVALID_POSITION;
396 | mPendingCarouselSavedState = null;
397 | } else if (null != mPendingCarouselSavedState) {
398 | mLayoutHelper.mScrollOffset = calculateScrollForSelectingPosition(mPendingCarouselSavedState.mCenterItemPosition, state);
399 | mPendingCarouselSavedState = null;
400 | } else if (state.didStructureChange() && INVALID_POSITION != mCenterItemPosition) {
401 | mLayoutHelper.mScrollOffset = calculateScrollForSelectingPosition(mCenterItemPosition, state);
402 | }
403 |
404 | fillData(recycler, state);
405 | }
406 |
407 | private int calculateScrollForSelectingPosition(final int itemPosition, final RecyclerView.State state) {
408 | if (itemPosition == INVALID_POSITION) {
409 | return 0;
410 | }
411 |
412 | final int fixedItemPosition = itemPosition < state.getItemCount() ? itemPosition : state.getItemCount() - 1;
413 | return fixedItemPosition * (VERTICAL == mOrientation ? mDecoratedChildHeight : mDecoratedChildWidth);
414 | }
415 |
416 | private void fillData(@NonNull final RecyclerView.Recycler recycler, @NonNull final RecyclerView.State state) {
417 | final float currentScrollPosition = getCurrentScrollPosition();
418 |
419 | generateLayoutOrder(currentScrollPosition, state);
420 | detachAndScrapAttachedViews(recycler);
421 | recyclerOldViews(recycler);
422 |
423 | final int width = getWidthNoPadding();
424 | final int height = getHeightNoPadding();
425 | if (VERTICAL == mOrientation) {
426 | fillDataVertical(recycler, width, height);
427 | } else {
428 | fillDataHorizontal(recycler, width, height);
429 | }
430 |
431 | recycler.clear();
432 |
433 | detectOnItemSelectionChanged(currentScrollPosition, state);
434 | }
435 |
436 | private void detectOnItemSelectionChanged(final float currentScrollPosition, final RecyclerView.State state) {
437 | final float absCurrentScrollPosition = makeScrollPositionInRange0ToCount(currentScrollPosition, state.getItemCount());
438 | final int centerItem = Math.round(absCurrentScrollPosition);
439 |
440 | if (mCenterItemPosition != centerItem) {
441 | mCenterItemPosition = centerItem;
442 | new Handler(Looper.getMainLooper()).post(new Runnable() {
443 | @Override
444 | public void run() {
445 | selectItemCenterPosition(centerItem);
446 | }
447 | });
448 | }
449 | }
450 |
451 | private void selectItemCenterPosition(final int centerItem) {
452 | for (final OnCenterItemSelectionListener onCenterItemSelectionListener : mOnCenterItemSelectionListeners) {
453 | onCenterItemSelectionListener.onCenterItemChanged(centerItem);
454 | }
455 | }
456 |
457 | private void fillDataVertical(final RecyclerView.Recycler recycler, final int width, final int height) {
458 | final int start = (width - mDecoratedChildWidth) / 2;
459 | final int end = start + mDecoratedChildWidth;
460 |
461 | final int centerViewTop = (height - mDecoratedChildHeight) / 2;
462 |
463 | for (int i = 0, count = mLayoutHelper.mLayoutOrder.length; i < count; ++i) {
464 | final LayoutOrder layoutOrder = mLayoutHelper.mLayoutOrder[i];
465 | final int offset = getCardOffsetByPositionDiff(layoutOrder.mItemPositionDiff);
466 | final int top = centerViewTop + offset;
467 | final int bottom = top + mDecoratedChildHeight;
468 | fillChildItem(start, top, end, bottom, layoutOrder, recycler, i);
469 | }
470 | }
471 |
472 | private void fillDataHorizontal(final RecyclerView.Recycler recycler, final int width, final int height) {
473 | final int top = (height - mDecoratedChildHeight) / 2;
474 | final int bottom = top + mDecoratedChildHeight;
475 |
476 | final int centerViewStart = (width - mDecoratedChildWidth) / 2;
477 |
478 | for (int i = 0, count = mLayoutHelper.mLayoutOrder.length; i < count; ++i) {
479 | final LayoutOrder layoutOrder = mLayoutHelper.mLayoutOrder[i];
480 | final int offset = getCardOffsetByPositionDiff(layoutOrder.mItemPositionDiff);
481 | final int start = centerViewStart + offset;
482 | final int end = start + mDecoratedChildWidth;
483 | fillChildItem(start, top, end, bottom, layoutOrder, recycler, i);
484 | }
485 | }
486 |
487 |
488 | @SuppressWarnings("MethodWithTooManyParameters")
489 | private void fillChildItem(final int start, final int top, final int end, final int bottom, @NonNull final LayoutOrder layoutOrder, @NonNull final RecyclerView.Recycler recycler, final int i) {
490 | final View view = bindChild(layoutOrder.mItemAdapterPosition, recycler);
491 | ViewCompat.setElevation(view, i);
492 | ItemTransformation transformation = null;
493 | if (null != mViewPostLayout) {
494 | transformation = mViewPostLayout.transformChild(view, layoutOrder.mItemPositionDiff, mOrientation, layoutOrder.mItemAdapterPosition);
495 | }
496 | if (null == transformation) {
497 | view.layout(start, top, end, bottom);
498 | } else {
499 | view.layout(Math.round(start + transformation.mTranslationX), Math.round(top + transformation.mTranslationY),
500 | Math.round(end + transformation.mTranslationX), Math.round(bottom + transformation.mTranslationY));
501 |
502 | view.setScaleX(transformation.mScaleX);
503 | view.setScaleY(transformation.mScaleY);
504 | }
505 | }
506 |
507 | /**
508 | * @return current scroll position of center item. this value can be in any range if it is cycle layout.
509 | * if this is not, that then it is in [0, {@link #mItemsCount - 1}]
510 | */
511 | private float getCurrentScrollPosition() {
512 | final int fullScrollSize = getMaxScrollOffset();
513 | if (0 == fullScrollSize) {
514 | return 0;
515 | }
516 | return 1.0f * mLayoutHelper.mScrollOffset / getScrollItemSize();
517 | }
518 |
519 | /**
520 | * @return maximum scroll value to fill up all items in layout. Generally this is only needed for non cycle layouts.
521 | */
522 | private int getMaxScrollOffset() {
523 | return getScrollItemSize() * (mItemsCount - 1);
524 | }
525 |
526 | /**
527 | * Because we can support old Android versions, we should layout our children in specific order to make our center view in the top of layout
528 | * (this item should layout last). So this method will calculate layout order and fill up {@link #mLayoutHelper} object.
529 | * This object will be filled by only needed to layout items. Non visible items will not be there.
530 | *
531 | * @param currentScrollPosition current scroll position this is a value that indicates position of center item
532 | * (if this value is int, then center item is really in the center of the layout, else it is near state).
533 | * Be aware that this value can be in any range is it is cycle layout
534 | * @param state Transient state of RecyclerView
535 | * @see #getCurrentScrollPosition()
536 | */
537 | private void generateLayoutOrder(final float currentScrollPosition, @NonNull final RecyclerView.State state) {
538 | mItemsCount = state.getItemCount();
539 | final float absCurrentScrollPosition = makeScrollPositionInRange0ToCount(currentScrollPosition, mItemsCount);
540 | final int centerItem = Math.round(absCurrentScrollPosition);
541 |
542 | if (mCircleLayout && 1 < mItemsCount) {
543 | final int layoutCount = Math.min(mLayoutHelper.mMaxVisibleItems * 2 + 1, mItemsCount);
544 |
545 | mLayoutHelper.initLayoutOrder(layoutCount);
546 |
547 | final int countLayoutHalf = layoutCount / 2;
548 | // before center item
549 | for (int i = 1; i <= countLayoutHalf; ++i) {
550 | final int position = Math.round(absCurrentScrollPosition - i + mItemsCount) % mItemsCount;
551 | mLayoutHelper.setLayoutOrder(countLayoutHalf - i, position, centerItem - absCurrentScrollPosition - i);
552 | }
553 | // after center item
554 | for (int i = layoutCount - 1; i >= countLayoutHalf + 1; --i) {
555 | final int position = Math.round(absCurrentScrollPosition - i + layoutCount) % mItemsCount;
556 | mLayoutHelper.setLayoutOrder(i - 1, position, centerItem - absCurrentScrollPosition + layoutCount - i);
557 | }
558 | mLayoutHelper.setLayoutOrder(layoutCount - 1, centerItem, centerItem - absCurrentScrollPosition);
559 |
560 | } else {
561 | final int firstVisible = Math.max(centerItem - mLayoutHelper.mMaxVisibleItems, 0);
562 | final int lastVisible = Math.min(centerItem + mLayoutHelper.mMaxVisibleItems, mItemsCount - 1);
563 | final int layoutCount = lastVisible - firstVisible + 1;
564 |
565 | mLayoutHelper.initLayoutOrder(layoutCount);
566 |
567 | for (int i = firstVisible; i <= lastVisible; ++i) {
568 | if (i == centerItem) {
569 | mLayoutHelper.setLayoutOrder(layoutCount - 1, i, i - absCurrentScrollPosition);
570 | } else if (i < centerItem) {
571 | mLayoutHelper.setLayoutOrder(i - firstVisible, i, i - absCurrentScrollPosition);
572 | } else {
573 | mLayoutHelper.setLayoutOrder(layoutCount - (i - centerItem) - 1, i, i - absCurrentScrollPosition);
574 | }
575 | }
576 | }
577 | }
578 |
579 | public int getWidthNoPadding() {
580 | return getWidth() - getPaddingStart() - getPaddingEnd();
581 | }
582 |
583 | public int getHeightNoPadding() {
584 | return getHeight() - getPaddingEnd() - getPaddingStart();
585 | }
586 |
587 | private View bindChild(final int position, @NonNull final RecyclerView.Recycler recycler) {
588 | final View view = recycler.getViewForPosition(position);
589 |
590 | addView(view);
591 | measureChildWithMargins(view, 0, 0);
592 |
593 | return view;
594 | }
595 |
596 | private void recyclerOldViews(final RecyclerView.Recycler recycler) {
597 | for (RecyclerView.ViewHolder viewHolder : new ArrayList<>(recycler.getScrapList())) {
598 | int adapterPosition = viewHolder.getAdapterPosition();
599 | boolean found = false;
600 | for (LayoutOrder layoutOrder : mLayoutHelper.mLayoutOrder) {
601 | if (layoutOrder.mItemAdapterPosition == adapterPosition) {
602 | found = true;
603 | break;
604 | }
605 | }
606 | if (!found) {
607 | recycler.recycleView(viewHolder.itemView);
608 | }
609 | }
610 | }
611 |
612 | /**
613 | * Called during {@link #fillData(RecyclerView.Recycler, RecyclerView.State)} to calculate item offset from layout center line.
614 | *
615 | * Returns {@link #convertItemPositionDiffToSmoothPositionDiff(float)} * (size off area above center item when it is on the center).
616 | * Sign is: plus if this item is bellow center line, minus if not
617 | *
618 | * ----- - area above it
619 | * ||||| - center item
620 | * ----- - area bellow it (it has the same size as are above center item)
621 | *
622 | * @param itemPositionDiff current item difference with layout center line. if this is 0, then this item center is in layout center line.
623 | * if this is 1 then this item is bellow the layout center line in the full item size distance.
624 | * @return offset in scroll px coordinates.
625 | */
626 | protected int getCardOffsetByPositionDiff(final float itemPositionDiff) {
627 | final double smoothPosition = convertItemPositionDiffToSmoothPositionDiff(itemPositionDiff);
628 |
629 | final int dimenDiff;
630 | if (VERTICAL == mOrientation) {
631 | dimenDiff = (getHeightNoPadding() - mDecoratedChildHeight) / 2;
632 | } else {
633 | dimenDiff = (getWidthNoPadding() - mDecoratedChildWidth) / 2;
634 | }
635 | //noinspection NumericCastThatLosesPrecision
636 | return (int) Math.round(Math.signum(itemPositionDiff) * dimenDiff * smoothPosition);
637 | }
638 |
639 | /**
640 | * Called during {@link #getCardOffsetByPositionDiff(float)} for better item movement.
641 | * Current implementation speed up items that are far from layout center line and slow down items that are close to this line.
642 | * This code is full of maths. If you want to make items move in a different way, probably you should override this method.
643 | * Please see code comments for better explanations.
644 | *
645 | * @param itemPositionDiff current item difference with layout center line. if this is 0, then this item center is in layout center line.
646 | * if this is 1 then this item is bellow the layout center line in the full item size distance.
647 | * @return smooth position offset. needed for scroll calculation and better user experience.
648 | * @see #getCardOffsetByPositionDiff(float)
649 | */
650 | @SuppressWarnings({"MagicNumber", "InstanceMethodNamingConvention"})
651 | protected double convertItemPositionDiffToSmoothPositionDiff(final float itemPositionDiff) {
652 | // generally item moves the same way above center and bellow it. So we don't care about diff sign.
653 | final float absIemPositionDiff = Math.abs(itemPositionDiff);
654 |
655 | // we detect if this item is close for center or not. We use (1 / maxVisibleItem) ^ (1/3) as close definer.
656 | if (absIemPositionDiff > StrictMath.pow(1.0f / mLayoutHelper.mMaxVisibleItems, 1.0f / 3)) {
657 | // this item is far from center line, so we should make it move like square root function
658 | return StrictMath.pow(absIemPositionDiff / mLayoutHelper.mMaxVisibleItems, 1 / 2.0f);
659 | } else {
660 | // this item is close from center line. we should slow it down and don't make it speed up very quick.
661 | // so square function in range of [0, (1/maxVisible)^(1/3)] is quite good in it;
662 | return StrictMath.pow(absIemPositionDiff, 2.0f);
663 | }
664 | }
665 |
666 | /**
667 | * @return full item size
668 | */
669 | protected int getScrollItemSize() {
670 | if (VERTICAL == mOrientation) {
671 | return mDecoratedChildHeight;
672 | } else {
673 | return mDecoratedChildWidth;
674 | }
675 | }
676 |
677 | @Override
678 | public Parcelable onSaveInstanceState() {
679 | if (null != mPendingCarouselSavedState) {
680 | return new CarouselSavedState(mPendingCarouselSavedState);
681 | }
682 | final CarouselSavedState savedState = new CarouselSavedState(super.onSaveInstanceState());
683 | savedState.mCenterItemPosition = mCenterItemPosition;
684 | return savedState;
685 | }
686 |
687 | @Override
688 | public void onRestoreInstanceState(final Parcelable state) {
689 | if (state instanceof CarouselSavedState) {
690 | mPendingCarouselSavedState = (CarouselSavedState) state;
691 |
692 | super.onRestoreInstanceState(mPendingCarouselSavedState.mSuperState);
693 | } else {
694 | super.onRestoreInstanceState(state);
695 | }
696 | }
697 |
698 | /**
699 | * @return Scroll offset from nearest item from center
700 | */
701 | protected int getOffsetCenterView() {
702 | return Math.round(getCurrentScrollPosition()) * getScrollItemSize() - mLayoutHelper.mScrollOffset;
703 | }
704 |
705 | protected int getOffsetForCurrentView(@NonNull final View view) {
706 | final int targetPosition = getPosition(view);
707 | final float directionDistance = getScrollDirection(targetPosition);
708 |
709 | return Math.round(directionDistance * getScrollItemSize());
710 | }
711 |
712 | /**
713 | * Helper method that make scroll in range of [0, count). Generally this method is needed only for cycle layout.
714 | *
715 | * @param currentScrollPosition any scroll position range.
716 | * @param count adapter items count
717 | * @return good scroll position in range of [0, count)
718 | */
719 | private static float makeScrollPositionInRange0ToCount(final float currentScrollPosition, final int count) {
720 | float absCurrentScrollPosition = currentScrollPosition;
721 | while (0 > absCurrentScrollPosition) {
722 | absCurrentScrollPosition += count;
723 | }
724 | while (Math.round(absCurrentScrollPosition) >= count) {
725 | absCurrentScrollPosition -= count;
726 | }
727 | return absCurrentScrollPosition;
728 | }
729 |
730 | /**
731 | * This interface methods will be called for each visible view item after general LayoutManager layout finishes.
732 | *
733 | * Generally this method should be used for scaling and translating view item for better (different) view presentation of layouting.
734 | */
735 | @SuppressWarnings("InterfaceNeverImplemented")
736 | public abstract static class PostLayoutListener {
737 |
738 | /**
739 | * Called after child layout finished. Generally you can do any translation and scaling work here.
740 | *
741 | * @param child view that was layout
742 | * @param itemPositionToCenterDiff view center line difference to layout center. if > 0 then this item is bellow layout center line, else if not
743 | * @param orientation layoutManager orientation {@link #getLayoutDirection()}
744 | * @param itemPositionInAdapter item position inside adapter for this layout pass
745 | */
746 | public ItemTransformation transformChild(
747 | @NonNull final View child,
748 | final float itemPositionToCenterDiff,
749 | final int orientation,
750 | final int itemPositionInAdapter
751 | ) {
752 | return transformChild(child, itemPositionToCenterDiff, orientation);
753 | }
754 |
755 | /**
756 | * Called after child layout finished. Generally you can do any translation and scaling work here.
757 | *
758 | * @param child view that was layout
759 | * @param itemPositionToCenterDiff view center line difference to layout center. if > 0 then this item is bellow layout center line, else if not
760 | * @param orientation layoutManager orientation {@link #getLayoutDirection()}
761 | */
762 | public ItemTransformation transformChild(
763 | @NonNull final View child,
764 | final float itemPositionToCenterDiff,
765 | final int orientation
766 | ) {
767 | throw new IllegalStateException("at least one transformChild should be implemented");
768 | }
769 | }
770 |
771 | public interface OnCenterItemSelectionListener {
772 |
773 | /**
774 | * Listener that will be called on every change of center item.
775 | * This listener will be triggered on every layout operation if item was changed.
776 | * Do not do any expensive operations in this method since this will effect scroll experience.
777 | *
778 | * @param adapterPosition current layout center item
779 | */
780 | void onCenterItemChanged(final int adapterPosition);
781 | }
782 |
783 | /**
784 | * Helper class that holds currently visible items.
785 | * Generally this class fills this list.
786 | *
787 | * This class holds all scroll and maxVisible items state.
788 | *
789 | * @see #getMaxVisibleItems()
790 | */
791 | private static class LayoutHelper {
792 |
793 | private int mMaxVisibleItems;
794 |
795 | private int mScrollOffset;
796 |
797 | private LayoutOrder[] mLayoutOrder;
798 |
799 | private final List> mReusedItems = new ArrayList<>();
800 |
801 | LayoutHelper(final int maxVisibleItems) {
802 | mMaxVisibleItems = maxVisibleItems;
803 | }
804 |
805 | /**
806 | * Called before any fill calls. Needed to recycle old items and init new array list. Generally this list is an array an it is reused.
807 | *
808 | * @param layoutCount items count that will be layout
809 | */
810 | void initLayoutOrder(final int layoutCount) {
811 | if (null == mLayoutOrder || mLayoutOrder.length != layoutCount) {
812 | if (null != mLayoutOrder) {
813 | recycleItems(mLayoutOrder);
814 | }
815 | mLayoutOrder = new LayoutOrder[layoutCount];
816 | fillLayoutOrder();
817 | }
818 | }
819 |
820 | /**
821 | * Called during layout generation process of filling this list. Should be called only after {@link #initLayoutOrder(int)} method call.
822 | *
823 | * @param arrayPosition position in layout order
824 | * @param itemAdapterPosition adapter position of item for future data filling logic
825 | * @param itemPositionDiff difference of current item scroll position and center item position.
826 | * if this is a center item and it is in real center of layout, then this will be 0.
827 | * if current layout is not in the center, then this value will never be int.
828 | * if this item center is bellow layout center line then this value is greater then 0,
829 | * else less then 0.
830 | */
831 | void setLayoutOrder(final int arrayPosition, final int itemAdapterPosition, final float itemPositionDiff) {
832 | final LayoutOrder item = mLayoutOrder[arrayPosition];
833 | item.mItemAdapterPosition = itemAdapterPosition;
834 | item.mItemPositionDiff = itemPositionDiff;
835 | }
836 |
837 | /**
838 | * Checks is this screen Layout has this adapterPosition view in layout
839 | *
840 | * @param adapterPosition adapter position of item for future data filling logic
841 | * @return true is adapterItem is in layout
842 | */
843 | boolean hasAdapterPosition(final int adapterPosition) {
844 | if (null != mLayoutOrder) {
845 | for (final LayoutOrder layoutOrder : mLayoutOrder) {
846 | if (layoutOrder.mItemAdapterPosition == adapterPosition) {
847 | return true;
848 | }
849 | }
850 | }
851 | return false;
852 | }
853 |
854 | @SuppressWarnings("VariableArgumentMethod")
855 | private void recycleItems(@NonNull final LayoutOrder... layoutOrders) {
856 | for (final LayoutOrder layoutOrder : layoutOrders) {
857 | //noinspection ObjectAllocationInLoop
858 | mReusedItems.add(new WeakReference<>(layoutOrder));
859 | }
860 | }
861 |
862 | private void fillLayoutOrder() {
863 | for (int i = 0, length = mLayoutOrder.length; i < length; ++i) {
864 | if (null == mLayoutOrder[i]) {
865 | mLayoutOrder[i] = createLayoutOrder();
866 | }
867 | }
868 | }
869 |
870 | private LayoutOrder createLayoutOrder() {
871 | final Iterator> iterator = mReusedItems.iterator();
872 | while (iterator.hasNext()) {
873 | final WeakReference layoutOrderWeakReference = iterator.next();
874 | final LayoutOrder layoutOrder = layoutOrderWeakReference.get();
875 | iterator.remove();
876 | if (null != layoutOrder) {
877 | return layoutOrder;
878 | }
879 | }
880 | return new LayoutOrder();
881 | }
882 | }
883 |
884 | /**
885 | * Class that holds item data.
886 | * This class is filled during {@link #generateLayoutOrder(float, RecyclerView.State)} and used during {@link #fillData(RecyclerView.Recycler, RecyclerView.State)}
887 | */
888 | private static class LayoutOrder {
889 |
890 | /**
891 | * Item adapter position
892 | */
893 | private int mItemAdapterPosition;
894 | /**
895 | * Item center difference to layout center. If center of item is bellow layout center, then this value is greater then 0, else it is less.
896 | */
897 | private float mItemPositionDiff;
898 | }
899 |
900 | protected static class CarouselSavedState implements Parcelable {
901 |
902 | private final Parcelable mSuperState;
903 | private int mCenterItemPosition;
904 |
905 | protected CarouselSavedState(@Nullable final Parcelable superState) {
906 | mSuperState = superState;
907 | }
908 |
909 | private CarouselSavedState(@NonNull final Parcel in) {
910 | mSuperState = in.readParcelable(Parcelable.class.getClassLoader());
911 | mCenterItemPosition = in.readInt();
912 | }
913 |
914 | protected CarouselSavedState(@NonNull final CarouselSavedState other) {
915 | mSuperState = other.mSuperState;
916 | mCenterItemPosition = other.mCenterItemPosition;
917 | }
918 |
919 | @Override
920 | public int describeContents() {
921 | return 0;
922 | }
923 |
924 | @Override
925 | public void writeToParcel(final Parcel parcel, final int i) {
926 | parcel.writeParcelable(mSuperState, i);
927 | parcel.writeInt(mCenterItemPosition);
928 | }
929 |
930 | public static final Parcelable.Creator CREATOR
931 | = new Parcelable.Creator() {
932 | @Override
933 | public CarouselSavedState createFromParcel(final Parcel parcel) {
934 | return new CarouselSavedState(parcel);
935 | }
936 |
937 | @Override
938 | public CarouselSavedState[] newArray(final int i) {
939 | return new CarouselSavedState[i];
940 | }
941 | };
942 | }
943 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/CarouselSmoothScroller.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | import android.graphics.PointF;
4 | import androidx.annotation.NonNull;
5 | import androidx.recyclerview.widget.RecyclerView;
6 | import android.view.View;
7 |
8 | /**
9 | * Custom implementation of {@link RecyclerView.SmoothScroller} that can work only with {@link CarouselLayoutManager}.
10 | *
11 | * @see CarouselLayoutManager
12 | */
13 | public class CarouselSmoothScroller {
14 |
15 | public CarouselSmoothScroller(@NonNull final RecyclerView.State state, final int position) {
16 | if (0 > position) {
17 | throw new IllegalArgumentException("position can't be less then 0. position is : " + position);
18 | }
19 | if (position >= state.getItemCount()) {
20 | throw new IllegalArgumentException("position can't be great then adapter items count. position is : " + position);
21 | }
22 | }
23 |
24 | @SuppressWarnings("unused")
25 | public PointF computeScrollVectorForPosition(final int targetPosition, @NonNull final CarouselLayoutManager carouselLayoutManager) {
26 | return carouselLayoutManager.computeScrollVectorForPosition(targetPosition);
27 | }
28 |
29 | @SuppressWarnings("unused")
30 | public int calculateDyToMakeVisible(final View view, @NonNull final CarouselLayoutManager carouselLayoutManager) {
31 | if (!carouselLayoutManager.canScrollVertically()) {
32 | return 0;
33 | }
34 |
35 | return carouselLayoutManager.getOffsetForCurrentView(view);
36 | }
37 |
38 | @SuppressWarnings("unused")
39 | public int calculateDxToMakeVisible(final View view, @NonNull final CarouselLayoutManager carouselLayoutManager) {
40 | if (!carouselLayoutManager.canScrollHorizontally()) {
41 | return 0;
42 | }
43 | return carouselLayoutManager.getOffsetForCurrentView(view);
44 | }
45 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/CarouselZoomPostLayoutListener.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | import androidx.annotation.NonNull;
4 | import android.view.View;
5 |
6 | /**
7 | * Implementation of {@link CarouselLayoutManager.PostLayoutListener} that makes interesting scaling of items.
8 | * We are trying to make items scaling quicker for closer items for center and slower for when they are far away.
9 | * Tis implementation uses atan function for this purpose.
10 | */
11 | public class CarouselZoomPostLayoutListener extends CarouselLayoutManager.PostLayoutListener {
12 |
13 | private final float mScaleMultiplier;
14 |
15 | public CarouselZoomPostLayoutListener() {
16 | this(0.17f);
17 | }
18 |
19 | public CarouselZoomPostLayoutListener(final float scaleMultiplier) {
20 | mScaleMultiplier = scaleMultiplier;
21 | }
22 |
23 | @Override
24 | public ItemTransformation transformChild(@NonNull final View child, final float itemPositionToCenterDiff, final int orientation) {
25 | final float scale = 1.0f - mScaleMultiplier * Math.abs(itemPositionToCenterDiff);
26 |
27 | // because scaling will make view smaller in its center, then we should move this item to the top or bottom to make it visible
28 | final float translateY;
29 | final float translateX;
30 | if (CarouselLayoutManager.VERTICAL == orientation) {
31 | final float translateYGeneral = child.getMeasuredHeight() * (1 - scale) / 2f;
32 | translateY = Math.signum(itemPositionToCenterDiff) * translateYGeneral;
33 | translateX = 0;
34 | } else {
35 | final float translateXGeneral = child.getMeasuredWidth() * (1 - scale) / 2f;
36 | translateX = Math.signum(itemPositionToCenterDiff) * translateXGeneral;
37 | translateY = 0;
38 | }
39 |
40 | return new ItemTransformation(scale, scale, translateX, translateY);
41 | }
42 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/CenterScrollListener.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | import androidx.annotation.NonNull;
4 | import androidx.recyclerview.widget.RecyclerView;
5 |
6 | /**
7 | * Class for centering items after scroll event.
8 | * This class will listen to current scroll state and if item is not centered after scroll it will automatically scroll it to center.
9 | */
10 | public class CenterScrollListener extends RecyclerView.OnScrollListener {
11 |
12 | private boolean mAutoSet = true;
13 |
14 | @Override
15 | public void onScrollStateChanged(@NonNull final RecyclerView recyclerView, final int newState) {
16 | super.onScrollStateChanged(recyclerView, newState);
17 | final RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
18 | if (!(layoutManager instanceof CarouselLayoutManager)) {
19 | mAutoSet = true;
20 | return;
21 | }
22 |
23 | final CarouselLayoutManager lm = (CarouselLayoutManager) layoutManager;
24 | if (!mAutoSet) {
25 | if (RecyclerView.SCROLL_STATE_IDLE == newState) {
26 | final int scrollNeeded = lm.getOffsetCenterView();
27 | if (CarouselLayoutManager.HORIZONTAL == lm.getOrientation()) {
28 | recyclerView.smoothScrollBy(scrollNeeded, 0);
29 | } else {
30 | recyclerView.smoothScrollBy(0, scrollNeeded);
31 | }
32 | mAutoSet = true;
33 | }
34 | }
35 | if (RecyclerView.SCROLL_STATE_DRAGGING == newState || RecyclerView.SCROLL_STATE_SETTLING == newState) {
36 | mAutoSet = false;
37 | }
38 | }
39 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/DefaultChildSelectionListener.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | import androidx.annotation.NonNull;
4 | import androidx.recyclerview.widget.RecyclerView;
5 | import android.view.View;
6 |
7 | public class DefaultChildSelectionListener extends CarouselChildSelectionListener {
8 |
9 | @NonNull
10 | private final OnCenterItemClickListener mOnCenterItemClickListener;
11 |
12 | protected DefaultChildSelectionListener(@NonNull final OnCenterItemClickListener onCenterItemClickListener, @NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager) {
13 | super(recyclerView, carouselLayoutManager);
14 |
15 | mOnCenterItemClickListener = onCenterItemClickListener;
16 | }
17 |
18 | @Override
19 | protected void onCenterItemClicked(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager, @NonNull final View v) {
20 | mOnCenterItemClickListener.onCenterItemClicked(recyclerView, carouselLayoutManager, v);
21 | }
22 |
23 | @Override
24 | protected void onBackItemClicked(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager, @NonNull final View v) {
25 | recyclerView.smoothScrollToPosition(carouselLayoutManager.getPosition(v));
26 | }
27 |
28 | public static DefaultChildSelectionListener initCenterItemListener(@NonNull final OnCenterItemClickListener onCenterItemClickListener, @NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager) {
29 | return new DefaultChildSelectionListener(onCenterItemClickListener, recyclerView, carouselLayoutManager);
30 | }
31 |
32 | public interface OnCenterItemClickListener {
33 |
34 | void onCenterItemClicked(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager, @NonNull final View v);
35 | }
36 | }
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/CarouselLayoutManager/carousellayoutmanager/src/main/java/com/mig35/carousellayoutmanager/ItemTransformation.java:
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1 | package com.mig35.carousellayoutmanager;
2 |
3 | public class ItemTransformation {
4 |
5 | final float mScaleX;
6 | final float mScaleY;
7 | final float mTranslationX;
8 | final float mTranslationY;
9 |
10 | public ItemTransformation(final float scaleX, final float scaleY, final float translationX, final float translationY) {
11 | mScaleX = scaleX;
12 | mScaleY = scaleY;
13 | mTranslationX = translationX;
14 | mTranslationY = translationY;
15 | }
16 | }
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/CarouselLayoutManager/gradle.properties:
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1 | # Project-wide Gradle settings.
2 |
3 | # IDE (e.g. Android Studio) users:
4 | # Gradle settings configured through the IDE *will override*
5 | # any settings specified in this file.
6 |
7 | # For more details on how to configure your build environment visit
8 | # http://www.gradle.org/docs/current/userguide/build_environment.html
9 |
10 | # Specifies the JVM arguments used for the daemon process.
11 | # The setting is particularly useful for tweaking memory settings.
12 | # Default value: -Xmx10248m -XX:MaxPermSize=256m
13 | android.enableJetifier=true
14 | android.useAndroidX=true
15 | org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
16 |
17 | # When configured, Gradle will run in incubating parallel mode.
18 | # This option should only be used with decoupled projects. More details, visit
19 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
20 | # org.gradle.parallel=true
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/CarouselLayoutManager/gradle/wrapper/gradle-wrapper.jar:
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https://raw.githubusercontent.com/Azoft/CarouselLayoutManager/979b5d3c17f44c5b5c1fa57472a8163efb2e9075/CarouselLayoutManager/gradle/wrapper/gradle-wrapper.jar
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/CarouselLayoutManager/gradle/wrapper/gradle-wrapper.properties:
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1 | #Mon Jan 18 09:06:02 NOVT 2021
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | zipStoreBase=GRADLE_USER_HOME
5 | zipStorePath=wrapper/dists
6 | distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
7 |
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/CarouselLayoutManager/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 | # Attempt to set APP_HOME
46 | # Resolve links: $0 may be a link
47 | PRG="$0"
48 | # Need this for relative symlinks.
49 | while [ -h "$PRG" ] ; do
50 | ls=`ls -ld "$PRG"`
51 | link=`expr "$ls" : '.*-> \(.*\)$'`
52 | if expr "$link" : '/.*' > /dev/null; then
53 | PRG="$link"
54 | else
55 | PRG=`dirname "$PRG"`"/$link"
56 | fi
57 | done
58 | SAVED="`pwd`"
59 | cd "`dirname \"$PRG\"`/" >/dev/null
60 | APP_HOME="`pwd -P`"
61 | cd "$SAVED" >/dev/null
62 |
63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
64 |
65 | # Determine the Java command to use to start the JVM.
66 | if [ -n "$JAVA_HOME" ] ; then
67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
68 | # IBM's JDK on AIX uses strange locations for the executables
69 | JAVACMD="$JAVA_HOME/jre/sh/java"
70 | else
71 | JAVACMD="$JAVA_HOME/bin/java"
72 | fi
73 | if [ ! -x "$JAVACMD" ] ; then
74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
75 |
76 | Please set the JAVA_HOME variable in your environment to match the
77 | location of your Java installation."
78 | fi
79 | else
80 | JAVACMD="java"
81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
82 |
83 | Please set the JAVA_HOME variable in your environment to match the
84 | location of your Java installation."
85 | fi
86 |
87 | # Increase the maximum file descriptors if we can.
88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
89 | MAX_FD_LIMIT=`ulimit -H -n`
90 | if [ $? -eq 0 ] ; then
91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
92 | MAX_FD="$MAX_FD_LIMIT"
93 | fi
94 | ulimit -n $MAX_FD
95 | if [ $? -ne 0 ] ; then
96 | warn "Could not set maximum file descriptor limit: $MAX_FD"
97 | fi
98 | else
99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
100 | fi
101 | fi
102 |
103 | # For Darwin, add options to specify how the application appears in the dock
104 | if $darwin; then
105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
106 | fi
107 |
108 | # For Cygwin, switch paths to Windows format before running java
109 | if $cygwin ; then
110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"`
111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
112 | JAVACMD=`cygpath --unix "$JAVACMD"`
113 |
114 | # We build the pattern for arguments to be converted via cygpath
115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
116 | SEP=""
117 | for dir in $ROOTDIRSRAW ; do
118 | ROOTDIRS="$ROOTDIRS$SEP$dir"
119 | SEP="|"
120 | done
121 | OURCYGPATTERN="(^($ROOTDIRS))"
122 | # Add a user-defined pattern to the cygpath arguments
123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then
124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
125 | fi
126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh
127 | i=0
128 | for arg in "$@" ; do
129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
131 |
132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
134 | else
135 | eval `echo args$i`="\"$arg\""
136 | fi
137 | i=$((i+1))
138 | done
139 | case $i in
140 | (0) set -- ;;
141 | (1) set -- "$args0" ;;
142 | (2) set -- "$args0" "$args1" ;;
143 | (3) set -- "$args0" "$args1" "$args2" ;;
144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
150 | esac
151 | fi
152 |
153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
154 | function splitJvmOpts() {
155 | JVM_OPTS=("$@")
156 | }
157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
159 |
160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
161 |
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/CarouselLayoutManager/gradlew.bat:
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1 | @if "%DEBUG%" == "" @echo off
2 | @rem ##########################################################################
3 | @rem
4 | @rem Gradle startup script for Windows
5 | @rem
6 | @rem ##########################################################################
7 |
8 | @rem Set local scope for the variables with windows NT shell
9 | if "%OS%"=="Windows_NT" setlocal
10 |
11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
12 | set DEFAULT_JVM_OPTS=
13 |
14 | set DIRNAME=%~dp0
15 | if "%DIRNAME%" == "" set DIRNAME=.
16 | set APP_BASE_NAME=%~n0
17 | set APP_HOME=%DIRNAME%
18 |
19 | @rem Find java.exe
20 | if defined JAVA_HOME goto findJavaFromJavaHome
21 |
22 | set JAVA_EXE=java.exe
23 | %JAVA_EXE% -version >NUL 2>&1
24 | if "%ERRORLEVEL%" == "0" goto init
25 |
26 | echo.
27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
28 | echo.
29 | echo Please set the JAVA_HOME variable in your environment to match the
30 | echo location of your Java installation.
31 |
32 | goto fail
33 |
34 | :findJavaFromJavaHome
35 | set JAVA_HOME=%JAVA_HOME:"=%
36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
37 |
38 | if exist "%JAVA_EXE%" goto init
39 |
40 | echo.
41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
42 | echo.
43 | echo Please set the JAVA_HOME variable in your environment to match the
44 | echo location of your Java installation.
45 |
46 | goto fail
47 |
48 | :init
49 | @rem Get command-line arguments, handling Windowz variants
50 |
51 | if not "%OS%" == "Windows_NT" goto win9xME_args
52 | if "%@eval[2+2]" == "4" goto 4NT_args
53 |
54 | :win9xME_args
55 | @rem Slurp the command line arguments.
56 | set CMD_LINE_ARGS=
57 | set _SKIP=2
58 |
59 | :win9xME_args_slurp
60 | if "x%~1" == "x" goto execute
61 |
62 | set CMD_LINE_ARGS=%*
63 | goto execute
64 |
65 | :4NT_args
66 | @rem Get arguments from the 4NT Shell from JP Software
67 | set CMD_LINE_ARGS=%$
68 |
69 | :execute
70 | @rem Setup the command line
71 |
72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
73 |
74 | @rem Execute Gradle
75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
76 |
77 | :end
78 | @rem End local scope for the variables with windows NT shell
79 | if "%ERRORLEVEL%"=="0" goto mainEnd
80 |
81 | :fail
82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
83 | rem the _cmd.exe /c_ return code!
84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
85 | exit /b 1
86 |
87 | :mainEnd
88 | if "%OS%"=="Windows_NT" endlocal
89 |
90 | :omega
91 |
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/CarouselLayoutManager/sample/.gitignore:
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1 | /build
2 |
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/CarouselLayoutManager/sample/build.gradle:
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1 | plugins {
2 | id 'com.android.application'
3 | }
4 |
5 | android {
6 | compileSdkVersion 30
7 |
8 | defaultConfig {
9 | applicationId "com.mig35.carousellayoutmanager.sample"
10 | minSdkVersion 14
11 | targetSdkVersion 30
12 | versionCode 1
13 | versionName "1.0"
14 | }
15 | buildTypes {
16 | release {
17 | minifyEnabled false
18 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
19 | }
20 | }
21 | buildFeatures {
22 | viewBinding true
23 | }
24 | }
25 |
26 | dependencies {
27 | implementation fileTree(include: ['*.jar'], dir: 'libs')
28 |
29 | implementation 'androidx.appcompat:appcompat:1.2.0'
30 | implementation 'com.google.android.material:material:1.3.0'
31 | implementation 'androidx.recyclerview:recyclerview:1.2.0'
32 | implementation 'com.mig35:carousellayoutmanager:+'
33 | // implementation project(':carousellayoutmanager')
34 | }
35 |
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/CarouselLayoutManager/sample/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # By default, the flags in this file are appended to flags specified
3 | # in C:\Users\Mikhail\Documents\tools\android_sdk/tools/proguard/proguard-android.txt
4 | # You can edit the include path and order by changing the proguardFiles
5 | # directive in build.gradle.
6 | #
7 | # For more details, see
8 | # http://developer.android.com/guide/developing/tools/proguard.html
9 |
10 | # Add any project specific keep options here:
11 |
12 | # If your project uses WebView with JS, uncomment the following
13 | # and specify the fully qualified class name to the JavaScript interface
14 | # class:
15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
16 | # public *;
17 | #}
18 |
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/CarouselLayoutManager/sample/src/main/AndroidManifest.xml:
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1 |
2 |
5 |
6 |
13 |
14 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
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/CarouselLayoutManager/sample/src/main/java/com/mig35/carousellayoutmanager/sample/CarouselPreviewActivity.java:
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1 | package com.mig35.carousellayoutmanager.sample;
2 |
3 | import android.graphics.Color;
4 | import android.os.Bundle;
5 | import android.util.Log;
6 | import android.view.LayoutInflater;
7 | import android.view.View;
8 | import android.view.ViewGroup;
9 | import android.widget.Toast;
10 |
11 | import com.mig35.carousellayoutmanager.CarouselLayoutManager;
12 | import com.mig35.carousellayoutmanager.CarouselZoomPostLayoutListener;
13 | import com.mig35.carousellayoutmanager.CenterScrollListener;
14 | import com.mig35.carousellayoutmanager.DefaultChildSelectionListener;
15 | import com.mig35.carousellayoutmanager.sample.databinding.ActivityCarouselPreviewBinding;
16 | import com.mig35.carousellayoutmanager.sample.databinding.ItemViewBinding;
17 |
18 | import java.util.Locale;
19 | import java.util.Random;
20 |
21 | import androidx.annotation.NonNull;
22 | import androidx.appcompat.app.AppCompatActivity;
23 | import androidx.recyclerview.widget.RecyclerView;
24 |
25 | public class CarouselPreviewActivity extends AppCompatActivity {
26 |
27 | @Override
28 | protected void onCreate(final Bundle savedInstanceState) {
29 | super.onCreate(savedInstanceState);
30 |
31 | final ActivityCarouselPreviewBinding binding = ActivityCarouselPreviewBinding.inflate(getLayoutInflater());
32 | setContentView(binding.getRoot());
33 |
34 | setSupportActionBar(binding.toolbar);
35 |
36 | final TestAdapter adapter = new TestAdapter();
37 |
38 | // create layout manager with needed params: vertical, cycle
39 | initRecyclerView(binding.listHorizontal, new CarouselLayoutManager(CarouselLayoutManager.HORIZONTAL, false), adapter);
40 | initRecyclerView(binding.listVertical, new CarouselLayoutManager(CarouselLayoutManager.VERTICAL, true), adapter);
41 |
42 | // fab button will add element to the end of the list
43 | binding.fabScroll.setOnClickListener(new View.OnClickListener() {
44 | @Override
45 | public void onClick(final View v) {
46 | /*
47 | final int itemToRemove = adapter.mItemsCount;
48 | if (10 != itemToRemove) {
49 | adapter.mItemsCount++;
50 | adapter.notifyItemInserted(itemToRemove);
51 | }
52 | */
53 | binding.listHorizontal.smoothScrollToPosition(adapter.getItemCount() - 2);
54 | binding.listVertical.smoothScrollToPosition(adapter.getItemCount() - 2);
55 | }
56 | });
57 |
58 | // fab button will remove element from the end of the list
59 | binding.fabChangeData.setOnClickListener(new View.OnClickListener() {
60 | @Override
61 | public void onClick(final View v) {
62 | /*
63 | final int itemToRemove = adapter.mItemsCount - 1;
64 | if (0 <= itemToRemove) {
65 | adapter.mItemsCount--;
66 | adapter.notifyItemRemoved(itemToRemove);
67 | }
68 | */
69 | binding.listHorizontal.smoothScrollToPosition(1);
70 | binding.listVertical.smoothScrollToPosition(1);
71 | }
72 | });
73 | }
74 |
75 | private void initRecyclerView(final RecyclerView recyclerView, final CarouselLayoutManager layoutManager, final TestAdapter adapter) {
76 | // enable zoom effect. this line can be customized
77 | layoutManager.setPostLayoutListener(new CarouselZoomPostLayoutListener());
78 | layoutManager.setMaxVisibleItems(3);
79 |
80 | recyclerView.setLayoutManager(layoutManager);
81 | // we expect only fixed sized item for now
82 | recyclerView.setHasFixedSize(true);
83 | // sample adapter with random data
84 | recyclerView.setAdapter(adapter);
85 | // enable center post scrolling
86 | recyclerView.addOnScrollListener(new CenterScrollListener());
87 | // enable center post touching on item and item click listener
88 | DefaultChildSelectionListener.initCenterItemListener(new DefaultChildSelectionListener.OnCenterItemClickListener() {
89 | @Override
90 | public void onCenterItemClicked(@NonNull final RecyclerView recyclerView, @NonNull final CarouselLayoutManager carouselLayoutManager, @NonNull final View v) {
91 | final int position = recyclerView.getChildLayoutPosition(v);
92 | final String msg = String.format(Locale.US, "Item %1$d was clicked", position);
93 | Toast.makeText(CarouselPreviewActivity.this, msg, Toast.LENGTH_SHORT).show();
94 | }
95 | }, recyclerView, layoutManager);
96 |
97 | layoutManager.addOnItemSelectionListener(new CarouselLayoutManager.OnCenterItemSelectionListener() {
98 |
99 | @Override
100 | public void onCenterItemChanged(final int adapterPosition) {
101 | if (CarouselLayoutManager.INVALID_POSITION != adapterPosition) {
102 | final int value = adapter.mPosition[adapterPosition];
103 | /*
104 | adapter.mPosition[adapterPosition] = (value % 10) + (value / 10 + 1) * 10;
105 | adapter.notifyItemChanged(adapterPosition);
106 | */
107 | }
108 | }
109 | });
110 | }
111 |
112 | private static final class TestAdapter extends RecyclerView.Adapter {
113 |
114 | private final int[] mColors;
115 | private final int[] mPosition;
116 | private final int mItemsCount = 100;
117 |
118 | TestAdapter() {
119 | mColors = new int[mItemsCount];
120 | mPosition = new int[mItemsCount];
121 | for (int i = 0; mItemsCount > i; ++i) {
122 | //noinspection MagicNumber
123 | final Random random = new Random();
124 | mColors[i] = Color.argb(255, random.nextInt(256), random.nextInt(256), random.nextInt(256));
125 | mPosition[i] = i;
126 | }
127 | }
128 |
129 | @Override
130 | public TestViewHolder onCreateViewHolder(@NonNull final ViewGroup parent, final int viewType) {
131 | Log.e("!!!!!!!!!", "onCreateViewHolder");
132 | return new TestViewHolder(ItemViewBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
133 | }
134 |
135 | @Override
136 | public void onBindViewHolder(final TestViewHolder holder, final int position) {
137 | Log.e("!!!!!!!!!", "onBindViewHolder: " + position);
138 | holder.mItemViewBinding.cItem1.setText(String.valueOf(mPosition[position]));
139 | holder.mItemViewBinding.cItem2.setText(String.valueOf(mPosition[position]));
140 | holder.itemView.setBackgroundColor(mColors[position]);
141 | }
142 |
143 | @Override
144 | public int getItemCount() {
145 | return mItemsCount;
146 | }
147 |
148 | @Override
149 | public long getItemId(final int position) {
150 | return position;
151 | }
152 | }
153 |
154 | private static class TestViewHolder extends RecyclerView.ViewHolder {
155 |
156 | private final ItemViewBinding mItemViewBinding;
157 |
158 | TestViewHolder(final ItemViewBinding itemViewBinding) {
159 | super(itemViewBinding.getRoot());
160 |
161 | mItemViewBinding = itemViewBinding;
162 | }
163 | }
164 | }
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/LICENSE:
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/README.md:
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1 | Android LayoutManager for RecyclerView to support Carousel view style
2 | ======================
3 |
4 | ## Examples
5 |
6 | 
7 |
8 | 
9 |
10 | ## Integration with Gradle
11 |
12 | ```
13 | implementation 'com.mig35:carousellayoutmanager:version'
14 | ```
15 |
16 | Please replace `version` with the latest version: 
17 |
18 | ## Description
19 |
20 | This LayoutManager works only with fixedSized items in adapter.
21 | To use this LayoutManager add gradle (maven) dependence and use this code (you can use CarouselLayoutManager.HORIZONTAL as well):
22 |
23 | final CarouselLayoutManager layoutManager = new CarouselLayoutManager(CarouselLayoutManager.VERTICAL);
24 |
25 | final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
26 | recyclerView.setLayoutManager(layoutManager);
27 | recyclerView.setHasFixedSize(true);
28 |
29 | To enable items center scrolling add this CenterScrollListener:
30 |
31 | recyclerView.addOnScrollListener(new CenterScrollListener());
32 |
33 | To enable zoom effects that is enabled in gif add this line:
34 |
35 | layoutManager.setPostLayoutListener(new CarouselZoomPostLayoutListener());
36 |
37 | Full code from this sample:
38 |
39 | // vertical and cycle layout
40 | final CarouselLayoutManager layoutManager = new CarouselLayoutManager(CarouselLayoutManager.VERTICAL, true);
41 | layoutManager.setPostLayoutListener(new CarouselZoomPostLayoutListener());
42 |
43 | final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
44 | recyclerView.setLayoutManager(layoutManager);
45 | recyclerView.setHasFixedSize(true);
46 | recyclerView.setAdapter(new TestAdapter(this));
47 | recyclerView.addOnScrollListener(new CenterScrollListener());
48 |
49 | ## Customizations
50 |
51 | You can enable and disable circular loop using two arguments constructor. Pass true to enable loop and false to disable.
52 |
53 | You can make carousel Vertically and Horizontally by changing first argument.
54 |
55 | You can change zoom level of bottom cards by changing `scaleMultiplier` argument in `CarouselZoomPostLayoutListener`. Big thanks to [JeneaVranceanu](https://github.com/JeneaVranceanu)!
56 |
57 | #### Contact ####
58 |
59 | Feel free to get in touch.
60 |
61 | Email: mig35@mig35.com
62 | Website: http://www.azoft.com
63 | Twitter: @azoft
64 | LinkedIn: https://www.linkedin.com/company/azoft
65 | Facebook: https://www.facebook.com/azoft.company
66 |
67 | #### License ####
68 |
69 | Licensed under the Apache License, Version 2.0 (the "License");
70 | you may not use this file except in compliance with the License.
71 | You may obtain a copy of the License at
72 |
73 | http://www.apache.org/licenses/LICENSE-2.0
74 |
75 | Unless required by applicable law or agreed to in writing, software
76 | distributed under the License is distributed on an "AS IS" BASIS,
77 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
78 | See the License for the specific language governing permissions and
79 | limitations under the License.
80 |
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