Index: bower_components/paper-ripple/paper-ripple.html |
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-<!-- |
-Copyright (c) 2014 The Polymer Project Authors. All rights reserved. |
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt |
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt |
-Code distributed by Google as part of the polymer project is also |
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt |
---> |
- |
-<!-- |
-`paper-ripple` provides a visual effect that other paper elements can |
-use to simulate a rippling effect emanating from the point of contact. The |
-effect can be visualized as a concentric circle with motion. |
- |
-Example: |
- |
- <paper-ripple></paper-ripple> |
- |
-`paper-ripple` listens to "down" and "up" events so it would display ripple |
-effect when touches on it. You can also defeat the default behavior and |
-manually route the down and up actions to the ripple element. Note that it is |
-important if you call downAction() you will have to make sure to call upAction() |
-so that `paper-ripple` would end the animation loop. |
- |
-Example: |
- |
- <paper-ripple id="ripple" style="pointer-events: none;"></paper-ripple> |
- ... |
- downAction: function(e) { |
- this.$.ripple.downAction({x: e.x, y: e.y}); |
- }, |
- upAction: function(e) { |
- this.$.ripple.upAction(); |
- } |
- |
-Styling ripple effect: |
- |
- Use CSS color property to style the ripple: |
- |
- paper-ripple { |
- color: #4285f4; |
- } |
- |
- Note that CSS color property is inherited so it is not required to set it on |
- the `paper-ripple` element directly. |
- |
-Apply `recenteringTouch` class to make the recentering rippling effect. |
- |
- <paper-ripple class="recenteringTouch"></paper-ripple> |
- |
-Apply `circle` class to make the rippling effect within a circle. |
- |
- <paper-ripple class="circle"></paper-ripple> |
- |
-@group Paper Elements |
-@element paper-ripple |
-@homepage github.io |
---> |
- |
-<link rel="import" href="../polymer/polymer.html" > |
- |
-<polymer-element name="paper-ripple" attributes="initialOpacity opacityDecayVelocity"> |
-<template> |
- |
- <style> |
- |
- :host { |
- display: block; |
- position: relative; |
- border-radius: inherit; |
- overflow: hidden; |
- } |
- |
- :host-context([noink]) { |
- pointer-events: none; |
- } |
- |
- #bg, #waves, .wave-container, .wave { |
- pointer-events: none; |
- position: absolute; |
- top: 0; |
- left: 0; |
- width: 100%; |
- height: 100%; |
- } |
- |
- #bg, .wave { |
- opacity: 0; |
- } |
- |
- #waves, .wave { |
- overflow: hidden; |
- } |
- |
- .wave-container, .wave { |
- border-radius: 50%; |
- } |
- |
- :host(.circle) #bg, |
- :host(.circle) #waves { |
- border-radius: 50%; |
- } |
- |
- :host(.circle) .wave-container { |
- overflow: hidden; |
- } |
- |
- </style> |
- |
- <div id="bg"></div> |
- <div id="waves"> |
- </div> |
- |
-</template> |
-<script> |
- |
- (function() { |
- |
- var waveMaxRadius = 150; |
- // |
- // INK EQUATIONS |
- // |
- function waveRadiusFn(touchDownMs, touchUpMs, anim) { |
- // Convert from ms to s. |
- var touchDown = touchDownMs / 1000; |
- var touchUp = touchUpMs / 1000; |
- var totalElapsed = touchDown + touchUp; |
- var ww = anim.width, hh = anim.height; |
- // use diagonal size of container to avoid floating point math sadness |
- var waveRadius = Math.min(Math.sqrt(ww * ww + hh * hh), waveMaxRadius) * 1.1 + 5; |
- var duration = 1.1 - .2 * (waveRadius / waveMaxRadius); |
- var tt = (totalElapsed / duration); |
- |
- var size = waveRadius * (1 - Math.pow(80, -tt)); |
- return Math.abs(size); |
- } |
- |
- function waveOpacityFn(td, tu, anim) { |
- // Convert from ms to s. |
- var touchDown = td / 1000; |
- var touchUp = tu / 1000; |
- var totalElapsed = touchDown + touchUp; |
- |
- if (tu <= 0) { // before touch up |
- return anim.initialOpacity; |
- } |
- return Math.max(0, anim.initialOpacity - touchUp * anim.opacityDecayVelocity); |
- } |
- |
- function waveOuterOpacityFn(td, tu, anim) { |
- // Convert from ms to s. |
- var touchDown = td / 1000; |
- var touchUp = tu / 1000; |
- |
- // Linear increase in background opacity, capped at the opacity |
- // of the wavefront (waveOpacity). |
- var outerOpacity = touchDown * 0.3; |
- var waveOpacity = waveOpacityFn(td, tu, anim); |
- return Math.max(0, Math.min(outerOpacity, waveOpacity)); |
- } |
- |
- // Determines whether the wave should be completely removed. |
- function waveDidFinish(wave, radius, anim) { |
- var waveOpacity = waveOpacityFn(wave.tDown, wave.tUp, anim); |
- |
- // If the wave opacity is 0 and the radius exceeds the bounds |
- // of the element, then this is finished. |
- return waveOpacity < 0.01 && radius >= Math.min(wave.maxRadius, waveMaxRadius); |
- }; |
- |
- function waveAtMaximum(wave, radius, anim) { |
- var waveOpacity = waveOpacityFn(wave.tDown, wave.tUp, anim); |
- |
- return waveOpacity >= anim.initialOpacity && radius >= Math.min(wave.maxRadius, waveMaxRadius); |
- } |
- |
- // |
- // DRAWING |
- // |
- function drawRipple(ctx, x, y, radius, innerAlpha, outerAlpha) { |
- // Only animate opacity and transform |
- if (outerAlpha !== undefined) { |
- ctx.bg.style.opacity = outerAlpha; |
- } |
- ctx.wave.style.opacity = innerAlpha; |
- |
- var s = radius / (ctx.containerSize / 2); |
- var dx = x - (ctx.containerWidth / 2); |
- var dy = y - (ctx.containerHeight / 2); |
- |
- ctx.wc.style.webkitTransform = 'translate3d(' + dx + 'px,' + dy + 'px,0)'; |
- ctx.wc.style.transform = 'translate3d(' + dx + 'px,' + dy + 'px,0)'; |
- |
- // 2d transform for safari because of border-radius and overflow:hidden clipping bug. |
- // https://bugs.webkit.org/show_bug.cgi?id=98538 |
- ctx.wave.style.webkitTransform = 'scale(' + s + ',' + s + ')'; |
- ctx.wave.style.transform = 'scale3d(' + s + ',' + s + ',1)'; |
- } |
- |
- // |
- // SETUP |
- // |
- function createWave(elem) { |
- var elementStyle = window.getComputedStyle(elem); |
- var fgColor = elementStyle.color; |
- |
- var inner = document.createElement('div'); |
- inner.style.backgroundColor = fgColor; |
- inner.classList.add('wave'); |
- |
- var outer = document.createElement('div'); |
- outer.classList.add('wave-container'); |
- outer.appendChild(inner); |
- |
- var container = elem.$.waves; |
- container.appendChild(outer); |
- |
- elem.$.bg.style.backgroundColor = fgColor; |
- |
- var wave = { |
- bg: elem.$.bg, |
- wc: outer, |
- wave: inner, |
- waveColor: fgColor, |
- maxRadius: 0, |
- isMouseDown: false, |
- mouseDownStart: 0.0, |
- mouseUpStart: 0.0, |
- tDown: 0, |
- tUp: 0 |
- }; |
- return wave; |
- } |
- |
- function removeWaveFromScope(scope, wave) { |
- if (scope.waves) { |
- var pos = scope.waves.indexOf(wave); |
- scope.waves.splice(pos, 1); |
- // FIXME cache nodes |
- wave.wc.remove(); |
- } |
- }; |
- |
- // Shortcuts. |
- var pow = Math.pow; |
- var now = Date.now; |
- if (window.performance && performance.now) { |
- now = performance.now.bind(performance); |
- } |
- |
- function cssColorWithAlpha(cssColor, alpha) { |
- var parts = cssColor.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/); |
- if (typeof alpha == 'undefined') { |
- alpha = 1; |
- } |
- if (!parts) { |
- return 'rgba(255, 255, 255, ' + alpha + ')'; |
- } |
- return 'rgba(' + parts[1] + ', ' + parts[2] + ', ' + parts[3] + ', ' + alpha + ')'; |
- } |
- |
- function dist(p1, p2) { |
- return Math.sqrt(pow(p1.x - p2.x, 2) + pow(p1.y - p2.y, 2)); |
- } |
- |
- function distanceFromPointToFurthestCorner(point, size) { |
- var tl_d = dist(point, {x: 0, y: 0}); |
- var tr_d = dist(point, {x: size.w, y: 0}); |
- var bl_d = dist(point, {x: 0, y: size.h}); |
- var br_d = dist(point, {x: size.w, y: size.h}); |
- return Math.max(tl_d, tr_d, bl_d, br_d); |
- } |
- |
- Polymer('paper-ripple', { |
- |
- /** |
- * The initial opacity set on the wave. |
- * |
- * @attribute initialOpacity |
- * @type number |
- * @default 0.25 |
- */ |
- initialOpacity: 0.25, |
- |
- /** |
- * How fast (opacity per second) the wave fades out. |
- * |
- * @attribute opacityDecayVelocity |
- * @type number |
- * @default 0.8 |
- */ |
- opacityDecayVelocity: 0.8, |
- |
- backgroundFill: true, |
- pixelDensity: 2, |
- |
- eventDelegates: { |
- down: 'downAction', |
- up: 'upAction' |
- }, |
- |
- ready: function() { |
- this.waves = []; |
- }, |
- |
- downAction: function(e) { |
- var wave = createWave(this); |
- |
- this.cancelled = false; |
- wave.isMouseDown = true; |
- wave.tDown = 0.0; |
- wave.tUp = 0.0; |
- wave.mouseUpStart = 0.0; |
- wave.mouseDownStart = now(); |
- |
- var rect = this.getBoundingClientRect(); |
- var width = rect.width; |
- var height = rect.height; |
- var touchX = e.x - rect.left; |
- var touchY = e.y - rect.top; |
- |
- wave.startPosition = {x:touchX, y:touchY}; |
- |
- if (this.classList.contains("recenteringTouch")) { |
- wave.endPosition = {x: width / 2, y: height / 2}; |
- wave.slideDistance = dist(wave.startPosition, wave.endPosition); |
- } |
- wave.containerSize = Math.max(width, height); |
- wave.containerWidth = width; |
- wave.containerHeight = height; |
- wave.maxRadius = distanceFromPointToFurthestCorner(wave.startPosition, {w: width, h: height}); |
- |
- // The wave is circular so constrain its container to 1:1 |
- wave.wc.style.top = (wave.containerHeight - wave.containerSize) / 2 + 'px'; |
- wave.wc.style.left = (wave.containerWidth - wave.containerSize) / 2 + 'px'; |
- wave.wc.style.width = wave.containerSize + 'px'; |
- wave.wc.style.height = wave.containerSize + 'px'; |
- |
- this.waves.push(wave); |
- |
- if (!this._loop) { |
- this._loop = this.animate.bind(this, { |
- width: width, |
- height: height |
- }); |
- requestAnimationFrame(this._loop); |
- } |
- // else there is already a rAF |
- }, |
- |
- upAction: function() { |
- for (var i = 0; i < this.waves.length; i++) { |
- // Declare the next wave that has mouse down to be mouse'ed up. |
- var wave = this.waves[i]; |
- if (wave.isMouseDown) { |
- wave.isMouseDown = false |
- wave.mouseUpStart = now(); |
- wave.mouseDownStart = 0; |
- wave.tUp = 0.0; |
- break; |
- } |
- } |
- this._loop && requestAnimationFrame(this._loop); |
- }, |
- |
- cancel: function() { |
- this.cancelled = true; |
- }, |
- |
- animate: function(ctx) { |
- var shouldRenderNextFrame = false; |
- |
- var deleteTheseWaves = []; |
- // The oldest wave's touch down duration |
- var longestTouchDownDuration = 0; |
- var longestTouchUpDuration = 0; |
- // Save the last known wave color |
- var lastWaveColor = null; |
- // wave animation values |
- var anim = { |
- initialOpacity: this.initialOpacity, |
- opacityDecayVelocity: this.opacityDecayVelocity, |
- height: ctx.height, |
- width: ctx.width |
- } |
- |
- for (var i = 0; i < this.waves.length; i++) { |
- var wave = this.waves[i]; |
- |
- if (wave.mouseDownStart > 0) { |
- wave.tDown = now() - wave.mouseDownStart; |
- } |
- if (wave.mouseUpStart > 0) { |
- wave.tUp = now() - wave.mouseUpStart; |
- } |
- |
- // Determine how long the touch has been up or down. |
- var tUp = wave.tUp; |
- var tDown = wave.tDown; |
- longestTouchDownDuration = Math.max(longestTouchDownDuration, tDown); |
- longestTouchUpDuration = Math.max(longestTouchUpDuration, tUp); |
- |
- // Obtain the instantenous size and alpha of the ripple. |
- var radius = waveRadiusFn(tDown, tUp, anim); |
- var waveAlpha = waveOpacityFn(tDown, tUp, anim); |
- var waveColor = cssColorWithAlpha(wave.waveColor, waveAlpha); |
- lastWaveColor = wave.waveColor; |
- |
- // Position of the ripple. |
- var x = wave.startPosition.x; |
- var y = wave.startPosition.y; |
- |
- // Ripple gravitational pull to the center of the canvas. |
- if (wave.endPosition) { |
- |
- // This translates from the origin to the center of the view based on the max dimension of |
- var translateFraction = Math.min(1, radius / wave.containerSize * 2 / Math.sqrt(2) ); |
- |
- x += translateFraction * (wave.endPosition.x - wave.startPosition.x); |
- y += translateFraction * (wave.endPosition.y - wave.startPosition.y); |
- } |
- |
- // If we do a background fill fade too, work out the correct color. |
- var bgFillColor = null; |
- if (this.backgroundFill) { |
- var bgFillAlpha = waveOuterOpacityFn(tDown, tUp, anim); |
- bgFillColor = cssColorWithAlpha(wave.waveColor, bgFillAlpha); |
- } |
- |
- // Draw the ripple. |
- drawRipple(wave, x, y, radius, waveAlpha, bgFillAlpha); |
- |
- // Determine whether there is any more rendering to be done. |
- var maximumWave = waveAtMaximum(wave, radius, anim); |
- var waveDissipated = waveDidFinish(wave, radius, anim); |
- var shouldKeepWave = !waveDissipated || maximumWave; |
- // keep rendering dissipating wave when at maximum radius on upAction |
- var shouldRenderWaveAgain = wave.mouseUpStart ? !waveDissipated : !maximumWave; |
- shouldRenderNextFrame = shouldRenderNextFrame || shouldRenderWaveAgain; |
- if (!shouldKeepWave || this.cancelled) { |
- deleteTheseWaves.push(wave); |
- } |
- } |
- |
- if (shouldRenderNextFrame) { |
- requestAnimationFrame(this._loop); |
- } |
- |
- for (var i = 0; i < deleteTheseWaves.length; ++i) { |
- var wave = deleteTheseWaves[i]; |
- removeWaveFromScope(this, wave); |
- } |
- |
- if (!this.waves.length && this._loop) { |
- // clear the background color |
- this.$.bg.style.backgroundColor = null; |
- this._loop = null; |
- this.fire('core-transitionend'); |
- } |
- } |
- |
- }); |
- |
- })(); |
- |
-</script> |
-</polymer-element> |