├── .gitignore ├── index.html ├── index.js ├── lib └── index.js ├── package-lock.json ├── package.json ├── pointer-stream.min.js └── readme.md /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | 3 | node_modules 4 | 5 | 6 | -------------------------------------------------------------------------------- /index.html: -------------------------------------------------------------------------------- 1 | 28 | 29 | 30 |

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35 | 36 | 37 | 58 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | module.exports = require('./lib') 2 | -------------------------------------------------------------------------------- /lib/index.js: -------------------------------------------------------------------------------- 1 | /* global window */ 2 | var mergeWith = function(t){ 3 | return function(a, b){ 4 | return [].concat( 5 | Object.keys(a), 6 | Object.keys(b) 7 | ) 8 | .reduce(function(p,k){ 9 | p[k] = p[k] || t(a[k], b[k]) 10 | return p 11 | }, {}) 12 | } 13 | } 14 | 15 | var merge = mergeWith(function(a,b){ 16 | return b || a 17 | }) 18 | 19 | var add = function(a,b){ return a + b } 20 | var subtract = function(a,b){ return a - b } 21 | 22 | var always = function(v){ 23 | return function(){ 24 | return v 25 | } 26 | } 27 | 28 | var mapObj = function(t,o){ 29 | return Object.keys(o) 30 | .reduce(function(p,k){ 31 | p[k] = t(o[k]) 32 | return p 33 | }, {}) 34 | } 35 | 36 | var clamp = function(min, max, value){ 37 | return Math.max(Math.min(value, max), min) 38 | } 39 | 40 | var f = require('flyd') 41 | var stream = f.stream 42 | var scan = f.scan 43 | var on = f.on 44 | var endsOn = f.endsOn 45 | 46 | var endsOn_ = f.curryN(2, endsOn) 47 | var initialCoords = { x:0 , y:0 } 48 | 49 | /** 50 | * Sets up the zoompoint as the centre of a radius 51 | * created by 2 pointers. 52 | * 53 | * Just like onscale_mousewheel, sets up some state 54 | * and then passes it down to onscale() in a uniform format. 55 | */ 56 | function onscale_fingers(state, a, b){ 57 | 58 | var x = [a.pageX, b.pageX] 59 | .sort(subtract).map(function(v){ return v - state.settings.offset().x }) 60 | var y = [a.pageY, b.pageY] 61 | .sort(subtract).map(function(v){ return v - state.settings.offset().y }) 62 | 63 | 64 | var dx = x[1] - x[0] 65 | var dy = y[1] - y[0] 66 | var d = Math.hypot(dx,dy) 67 | 68 | if(state.pinching() == 1){ 69 | state.touchRadius(d) 70 | } else { 71 | var zoompoint = 72 | { x: x[1] - dx / 2 73 | , y: y[1] - dy / 2 74 | } 75 | 76 | var newScale = state.initialPinchScale() * d / state.touchRadius() 77 | 78 | onscale(state, zoompoint, newScale) 79 | } 80 | } 81 | 82 | /** 83 | * A lot like, onscale_fingers(). 84 | * It sets up some state, and then passes it on scale. 85 | * 86 | * Mousewheel just {inc,dec}rements 87 | * a number, unlike fingers, which uses the ratio of changes 88 | * in the radius caused by the fingers. 89 | * 90 | * This function sets toggles state.wheeling while it updates 91 | * the other userfacing streams, so a user could make decisions 92 | * about how they want to react to a scale event. 93 | */ 94 | function onscale_mousewheel(state, e){ 95 | if(Math.abs(e.deltaX) < 1e-1){ 96 | // now we tell everyone we are scrolling the mouse wheel 97 | // so our coords stream doesn't ignore these movements 98 | state.wheeling(true) 99 | 100 | var zoompoint = 101 | { x: e.pageX - state.settings.offset().x 102 | , y: e.pageY - state.settings.offset().y 103 | } 104 | 105 | // scale more quickly the higher the scale gets 106 | var next = 0.01 + state.scale() * 1e-1 107 | var nextScale = state.scale() 108 | + ( 109 | e.deltaY > 0 110 | ? - next 111 | : + next 112 | ) 113 | 114 | onscale(state, zoompoint, nextScale) 115 | 116 | // sync the pinch scale with the mousewheel scaling 117 | // otherwise, switching from 1 to the other can cause jumps in scale 118 | state.initialPinchScale(state.scale()) 119 | 120 | state.wheeling(false) 121 | } 122 | } 123 | 124 | /** 125 | * Calculates how much to move the viewport in order to keep 126 | * the zoompoint in the same position (as a ratio) between zooms 127 | * 128 | * The scale itself, is calculated upstream - 129 | * this tells the user how much they need to shift 130 | * their container to retain the screen position across scales. 131 | */ 132 | function onscale(state, zoompoint, nextScale){ 133 | var scale = 134 | { current: state.scale() 135 | , next: clamp( 136 | state.settings.scale.min, state.settings.scale.max, nextScale 137 | ) 138 | } 139 | 140 | // 1. how far into the *current* viewport, the zoompoint is, as a ratio 141 | // 2. how far into the *new* viewport, the zoompoint is as a ratio 142 | // 3. the correct translation to the new viewport, so those ratios are equal 143 | // 144 | // In order to get 1. and 2. 145 | // We need to know the zoompoint coordinates from the perspective 146 | // of each viewport, the translation coords are always in world. 147 | 148 | var bounds = { 149 | w: window.innerWidth - state.settings.offset().x 150 | ,h: window.innerHeight - state.settings.offset().y 151 | } 152 | 153 | var viewports = { 154 | current: { 155 | // origin of current viewport (0,0) 156 | // in world coordinates (x,y) 157 | x: state.coords().x , y: state.coords().y 158 | 159 | // the dimensions of the viewport, in world coordinates 160 | ,w: bounds.w / scale.current 161 | ,h: bounds.h / scale.current 162 | } 163 | ,next: { 164 | x: state.coords().x, y: state.coords().y 165 | ,w: bounds.w / scale.next 166 | ,h: bounds.h / scale.next 167 | } 168 | } 169 | 170 | var ratios = 171 | // the ratio the zoom point is into the viewport 172 | // 0.5 would be the mouse half way through 173 | // the viewport (but not the window!) 174 | { current: 175 | { x: (zoompoint.x - viewports.current.x) / viewports.current.w 176 | , y: (zoompoint.y - viewports.current.y) / viewports.current.h 177 | } 178 | 179 | // the next viewport will be slightly bigger or slightly smaller 180 | // so its ratio will be slightly bigger or smaller 181 | // we can use the ratio to translate the viewport so our zoompoint 182 | // doesn't drift as we scale 183 | , next: 184 | { x: (zoompoint.x - viewports.next.x) / viewports.next.w 185 | , y: (zoompoint.y - viewports.next.y) / viewports.next.h 186 | } 187 | } 188 | 189 | // we now have the ratios that allow us to compare 190 | // how much the zoompoint would drift 191 | // but our code above, assumes both viewports have the same origin 192 | // this means the container that is being scaled 193 | // must have transform-origin set to "top left" 194 | // 195 | // with that out of the way, lets figure out how to 196 | // compensate for the scale drift 197 | // we find the difference between the two ratios, 198 | // and we multiply that difference 199 | // by the dimensions of the new viewport 200 | var zoomDrift = 201 | { x: (ratios.next.x - ratios.current.x) * viewports.current.w * -1 202 | , y: (ratios.next.y - ratios.current.y) * viewports.current.h * -1 203 | } 204 | 205 | 206 | 207 | // apply the zoom drift to the container 208 | // so our zoom point is always in the same "spot" 209 | // at whatever zoom level 210 | state.movement(zoomDrift) 211 | state.move(zoompoint) 212 | 213 | // apply our new scale so the container can update 214 | state.scale(scale.next) 215 | } 216 | 217 | /** 218 | * By incrementing, it would be quite trivial 219 | * to create a custom longtap/click stream 220 | * in userland 221 | */ 222 | function onmousedown(state,e ){ 223 | if(state.container().contains(e.target)){ 224 | state.mousedown(state.mousedown()+1) 225 | } 226 | } 227 | 228 | /** 229 | * Reset mousedown, dragging and pinching. 230 | * Save the pinchScale so we have a base scale 231 | * to work with next time 232 | */ 233 | function onmouseup(state, e){ 234 | state.mousedown(0) 235 | state.dragging(false) 236 | state.selectingText(false) 237 | 238 | if(e.touches && e.touches.length){ 239 | state.pinching(0) 240 | state.initialPinchScale( state.scale() ) 241 | } 242 | } 243 | 244 | /** 245 | * Manages a few states. Dragging, mouse position. 246 | * Triggers pinch zoom, if there are many touches. 247 | * 248 | * Otherwise it treats a dragging finger, just like 249 | * a click and drag gesture with a mouse 250 | */ 251 | function onmousemove(state, e){ 252 | 253 | if( state.selectingText() ){ 254 | } else { 255 | /** 256 | * Fig 1. 257 | * This may seem unnecessary to check if the state is pinching. 258 | * Seeing as we are the onces that set it. 259 | * 260 | * But its important to remember that this handler will accept 261 | * events from both the mouse and fingers. And if the mouse happens to be 262 | * on screen when someone decides to pinch, it will conflict and jump 263 | * to the mouse's coordinates; if the condtion in Fig 1. is not present 264 | */ 265 | 266 | var touches = e.touches || [] 267 | var event = touches[0] || e 268 | 269 | if(touches.length > 1){ 270 | // +1 how long have we been pinching for? 271 | state.pinching(state.pinching()+1) 272 | onscale_fingers(state, e.touches[0], e.touches[1]) 273 | 274 | } else if( !state.pinching() ) { // Fig 1. 275 | 276 | 277 | var x = event.pageX - state.settings.offset().x 278 | var y = event.pageY - state.settings.offset().y 279 | 280 | if(state.mousedown() > 2){ 281 | if( state.settings.ignoreTextSelect && !state.selectingText() ){ 282 | state.selectingText( 283 | (getSelection()+"").length > 0 284 | ) 285 | } 286 | } 287 | 288 | if(!state.selectingText() && state.mousedown() > 3){ 289 | 290 | state.dragging(state.mousedown()) 291 | var movement = 292 | { x: (x - state.move().x) * state.polarity().x 293 | , y: (y - state.move().y) * state.polarity().y 294 | } 295 | state.movement(movement) 296 | } 297 | 298 | state.move({ x:x, y:y }) 299 | } 300 | 301 | // It is possible to move the mouse without having the mouse down 302 | // We only want to increment, if we are already incrementing. 303 | state.mousedown( 304 | state.mousedown() 305 | + ( 306 | state.mousedown() > 0 307 | ? 1 308 | : 0 309 | ) 310 | ) 311 | } 312 | } 313 | 314 | function streamFromEvent(container, event, endStream){ 315 | var s = stream() 316 | var processed = true 317 | container.addEventListener(event, function(e){ 318 | if( processed ){ 319 | processed = false 320 | requestAnimationFrame(function(){ 321 | s(e) 322 | processed=true 323 | }) 324 | } 325 | }) 326 | on(function(){ 327 | container.removeEventListener(event,s) 328 | }, s.end ) 329 | return endsOn(endStream, s) 330 | } 331 | 332 | var defaultOptions = { 333 | offset: { x:0 , y:0 } 334 | ,scale: { min:0.5, max:40 } 335 | ,coords: { min: { x: -Infinity, y: -Infinity}, max: { x: Infinity, y: Infinity } } 336 | } 337 | function Pointer(options){ 338 | options = options || defaultOptions 339 | options.offset = options.offset || defaultOptions.offset 340 | options.scale = options.scale || defaultOptions.scale 341 | options.manualActivation = options.manualActivation || false 342 | options.container = options.container || always(document.body) 343 | 344 | options.coords = options.coords || defaultOptions.coords 345 | options.polarity = options.polarity || { x: 1, y: 1 } 346 | options.ignoreTextSelect = options.ignoreTextSelect || false 347 | 348 | const selectingText = stream(false) 349 | 350 | var x = options.offset.x 351 | var y = options.offset.y 352 | var min = options.scale.min 353 | var max = options.scale.max 354 | /** 355 | * Pass `true` into this stream and it will 356 | * destroy all event lsiteners and internal streams 357 | */ 358 | var end = stream() 359 | 360 | var offset = stream({ 361 | x:x 362 | ,y:y 363 | }) 364 | 365 | /** 366 | * Flip polarity for x/y axis to change behavour of event handlers 367 | */ 368 | var polarity = stream(options.polarity) 369 | /* 370 | * A stream of numbers that increments for every 371 | * mousemove event. 372 | * Resets to 0 on mouseup/touchend 373 | */ 374 | var mousedown = stream(0) 375 | 376 | /** 377 | * A stream of increment translations. 378 | * Useful if you want to apply incremental translations 379 | * in sync with coords updating. 380 | */ 381 | var movement = stream(initialCoords) 382 | 383 | /** 384 | * The last known coordinates of the pointer as a stream 385 | */ 386 | var move = stream(initialCoords) 387 | 388 | /** 389 | * A stream of booleans indicating whether we are currently dragging 390 | */ 391 | 392 | var dragging = stream(false) 393 | /** 394 | * A stream of booleans indicating whether we are currently pinching 395 | */ 396 | var pinching = stream(0) 397 | 398 | /** 399 | * A stream of booleans indicating whether we are currently wheeling 400 | */ 401 | var wheeling = stream(0) 402 | 403 | /** 404 | * A stream of the current scale of the viewport. 405 | * Responds to mouse wheel and pinchzoom 406 | */ 407 | var scale = stream(1) 408 | 409 | /** 410 | * The viewport scale at the end of the last pinch gesture. 411 | * Used internally, but exposed because why not? 412 | */ 413 | var initialPinchScale = stream(1) 414 | 415 | /** 416 | * The radius of the circle created by the first two touches in 417 | * in the event.touches array. 418 | * 419 | * Used internally to calculate the scale. 420 | */ 421 | var touchRadius = stream(1) 422 | 423 | 424 | /** 425 | * A predicate true if we are either dragging or zooming 426 | */ 427 | var notHover = function() { 428 | 429 | return [dragging,pinching,wheeling] 430 | .some(function(s){ 431 | return s() 432 | }) 433 | } 434 | 435 | /** 436 | * The coords you should translate your canvas or container 437 | * Adds all movements to a vector when either dragging or zooming 438 | * These coords are global, so you should apply them _before_ scaling 439 | */ 440 | var coords = scan( 441 | function(p, n) { 442 | if( notHover() ){ 443 | return { 444 | x: clamp(options.coords.min.x, options.coords.max.x, p.x + n.x) 445 | ,y: clamp(options.coords.min.y, options.coords.max.y, p.y + n.y) 446 | } 447 | } else { 448 | return p 449 | } 450 | 451 | } 452 | ,initialCoords 453 | ,movement 454 | ) 455 | 456 | /** 457 | * All the state streams that get passed to the event handlers. 458 | * This is also the public API of the pointer instance. 459 | */ 460 | 461 | var state = 462 | merge( 463 | { 464 | settings: { 465 | scale: { min:min, max:max }, offset:offset 466 | ,coords: options.coords 467 | ,ignoreTextSelect: options.ignoreTextSelect 468 | } 469 | ,container: options.container 470 | 471 | /** 472 | * Create a stream for event. 473 | * The event stream will be destroyed when the end stream 474 | * receives `true` as a value. 475 | * 476 | * Also passes in the state to each handler. 477 | */ 478 | ,activateListeners: function(){ 479 | ;[ 480 | ,[onmousedown, 'mousedown'] 481 | ,[onmouseup, 'mouseup'] 482 | ,[onmousemove, 'mousemove'] 483 | ,[onmouseup, 'touchend'] 484 | ,[onmousedown, 'touchstart'] 485 | ,[onmousemove, 'touchmove'] 486 | ] 487 | .concat( 488 | options.disable_mousewheel 489 | ? [] 490 | : [[onscale_mousewheel, 'wheel']] 491 | ) 492 | .map(function(pair){ 493 | var handler = pair[0] 494 | var eventName = pair[1] 495 | var container = options.container() 496 | return streamFromEvent(window, eventName, end).map( 497 | function(e){ 498 | return handler(state, e) 499 | } 500 | ) 501 | }) 502 | } 503 | } 504 | ,mapObj(endsOn_(end), { 505 | mousedown:mousedown 506 | ,movement:movement 507 | ,move:move 508 | ,dragging:dragging 509 | ,pinching:pinching 510 | ,wheeling:wheeling 511 | ,scale:scale 512 | ,initialPinchScale:initialPinchScale 513 | ,touchRadius:touchRadius 514 | ,coords:coords 515 | ,selectingText: selectingText 516 | ,polarity: polarity 517 | ,end:end 518 | 519 | }) 520 | ) 521 | 522 | if( !options.manualActivation ){ 523 | state.activateListeners() 524 | } 525 | 526 | /** 527 | * Give the user access to coords, scale and other streams. 528 | */ 529 | return state 530 | 531 | } 532 | 533 | global.PointerStream = Pointer 534 | module.exports = Pointer 535 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c<=0?i.apply(this,u):r(c,n(e,u,i))}}},{"./_arity":4,"./_isPlaceholder":8}],8:[function(n,e,t){e.exports=function(n){return null!=n&&"object"==typeof n&&!0===n["@@functional/placeholder"]}},{}]},{},[1]); 2 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | pointer-stream 2 | ============== 3 | 4 | Convenient, concise, streaming interface for scale, drag & movement. 5 | A single API for mouse and touch events in 3.3k gzipped (9k minified) 6 | 7 | [Live Example](http://james-forbes.com/pointer-stream) 8 | 9 | 10 | Quick Start 11 | ----------- 12 | 13 | 14 | #### Installation 15 | 16 | `npm install pointer-stream` 17 | 18 | 19 | Drop `pointer-stream.min.js` in your html file. 20 | 21 | ```html 22 | 23 | ``` 24 | 25 | Or using browserify: 26 | 27 | ```js 28 | var PointerStream = require('pointer-stream') 29 | ``` 30 | 31 | #### Usage 32 | 33 | ```js 34 | const pointer = PointerStream({ 35 | offset: { x: 0, y: 0 } 36 | ,scale: { min: 1, max: 40 } 37 | }) 38 | 39 | // subscribe to changes in scale 40 | pointer.scale.map(function(scale){ 41 | container.style.transform = 'scale('+scale+')' 42 | }) 43 | 44 | // translate your container 45 | pointer.coords.map(function({x,y}){ 46 | container.style.transform = 'translate('+x+'px,'+y+'px)' 47 | }) 48 | 49 | // clean up the pointer events, so they can be gc'd 50 | pointer.end(true) 51 | 52 | ``` 53 | 54 | Advanced Use 55 | ------------ 56 | 57 | All the streams used are [flyd](https://github.com/paldepind/flyd) streams. 58 | You can use any of the operators flyd supports, *and* you can use 59 | Fantasy land compatible libraries like [Ramda](https://github.com/ramda/ramda) 60 | to transform the streams in advanced ways. 61 | 62 | ```js 63 | 64 | // If any of these streams return True 65 | // `hovering` will return false 66 | 67 | const hovering = R.pipe( 68 | R.always([ 69 | pointer.dragging 70 | ,pointer.pinching 71 | ,pointer.wheeling 72 | ]) 73 | ,R.anyPass 74 | ,R.complement 75 | ) 76 | ``` 77 | 78 | There are many low level streams exposed that can be composed to 79 | create more advanced, specific streams. 80 | 81 | 82 | Transform Origin and Offset 83 | --------------------------- 84 | 85 | `coords` is a convenience stream for translating a container. 86 | 87 | It updates whenever a drag or scale event occurs. If you find the 88 | container translation behaviour is a little off, you can try 89 | adding a transform origin rule to your element: 90 | 91 | 92 | ```css 93 | #container { 94 | transform-origin: 'top left' 95 | } 96 | ``` 97 | 98 | If your container is offset at all, you can pass a value to 99 | `pointer.settings.offset({ x,y })`. 100 | 101 | Subsequent events will be translated based on coords updating. 102 | 103 | --- 104 | 105 | 106 | Interface 107 | --------- 108 | 109 | Type signature of the `PointerStream` 110 | constructor. 111 | 112 | ```js 113 | { {offset:{x,y}, scale:{min,max} }} => 114 | 115 | { mousedown: stream Number 116 | , movement: stream { x: Number, y: Number } 117 | , move: stream { x: Number, y: Number } 118 | , dragging: stream Boolean 119 | , pinching: stream Number 120 | , wheeling: stream Number 121 | , scale: stream Number 122 | , coords: stream { x: Number, y: Number } 123 | , end: stream Boolean? 124 | , settings: 125 | { scale: { min: Number, max: Number } 126 | , offset: { x: stream Number, y: stream Number} 127 | } 128 | } 129 | 130 | ``` 131 | 132 | API 133 | --- 134 | 135 | Note: Unless otherwise stated, all streams respond to touch and mouse. Even streams like `mousemove`. 136 | The idea is, you can abstract away whether an event came from the mouse or 137 | a finger, without having to learn non standard event names. 138 | 139 | #### mousedown 140 | 141 | `stream Number` 142 | 143 | An integer that increments on every mouse move event. Used internally 144 | to determine whether a drag is occuring. 145 | 146 | Could potentially be used to create a `long-press` stream 147 | 148 | #### movement 149 | 150 | `stream {x,y}` 151 | 152 | The amount we have moved since the previous event. Used internally 153 | to create the `coords` stream. 154 | 155 | #### move 156 | 157 | `stream {x,y}` 158 | 159 | The current position of either the finger or the mouse. 160 | In the case of multiple pointers, `move` will be the center 161 | of the first two fingers in the `touches` array. 162 | 163 | 164 | #### dragging 165 | 166 | `stream Boolean` 167 | 168 | True if the mouse is click+dragging or if a finger is panning. 169 | 170 | #### pinching 171 | 172 | `stream Boolean` 173 | 174 | This stream is specific to touch. 175 | 176 | True if two fingers are pinch/zooming. 177 | 178 | #### wheeling 179 | 180 | `stream Boolean` 181 | 182 | This stream is specific to the mouse. 183 | 184 | True if the mouse wheel is moving. Used internally to dispatch to a 185 | specific scale handler. 186 | 187 | 188 | #### scale 189 | 190 | `stream Number` 191 | 192 | The current scale of the container. Increments when zooming in 193 | and decrements when zooming out. 194 | 195 | #### end 196 | 197 | `stream Boolean?` 198 | 199 | Pass `true` into this stream to clean up the pointer instance. 200 | 201 | ```js 202 | pointer.end(true) 203 | ``` 204 | 205 | All streams will cease to emit new values and will be garbage collected. 206 | 207 | #### settings.scale {min,max} 208 | 209 | Specify the minimum and maximum scale. This will clamp the scale 210 | on subsequent events. 211 | 212 | #### settings.offset {x,y} 213 | 214 | The current offset of your container. Allows you to inform 215 | a `pointer` instance if your container has moved. 216 | This allows the library to calibrate `coords` `move` and `movement` 217 | --------------------------------------------------------------------------------