Devtools Animations: Add buffer and effect selection to animation timeline

Source/devtools/front_end/animation/AnimationTimeline.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.AnimationTimeline = function()
@@ skipping 13 matching lines @@
 
     this._emptyTimelineMessage = this._animationsContainer.createChild("div", "animation-timeline-empty-message");
     var message = this._emptyTimelineMessage.createChild("div");
     message.textContent = WebInspector.UIString("Trigger animations on the page to view and tweak them on the animation timeline.");
 
     this._duration = this._defaultDuration();
     this._scrubberRadius = 30;
     this._timelineControlsWidth = 230;
     /** @type {!Map.<!DOMAgent.BackendNodeId, !WebInspector.AnimationTimeline.NodeUI>} */
     this._nodesMap = new Map();
+    this._groupBuffer = [];
+    this._groupBufferSize = 8;
+    /** @type {!Map.<!WebInspector.AnimationModel.AnimationGroup, !WebInspector.AnimationGroupPreviewUI>} */
+    this._previewMap = new Map();
     this._symbol = Symbol("animationTimeline");
     /** @type {!Map.<string, !WebInspector.AnimationModel.Animation>} */
     this._animationsMap = new Map();
     WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
     WebInspector.targetManager.addModelListener(WebInspector.DOMModel, WebInspector.DOMModel.Events.NodeRemoved, this._nodeRemoved, this);
 
     WebInspector.targetManager.observeTargets(this, WebInspector.Target.Type.Page);
 }
 
 WebInspector.AnimationTimeline.GlobalPlaybackRates = [0.1, 0.25, 0.5, 1.0];
@@ skipping 30 matching lines @@
         this._removeEventListeners(target);
     },
 
     /**
      * @param {!WebInspector.Target} target
      */
     _addEventListeners: function(target)
     {
         var animationModel = WebInspector.AnimationModel.fromTarget(target);
         animationModel.ensureEnabled();
-        animationModel.addEventListener(WebInspector.AnimationModel.Events.AnimationCreated, this._animationCreated, this);
+        animationModel.addEventListener(WebInspector.AnimationModel.Events.AnimationGroupStarted, this._animationGroupStarted, this);
         animationModel.addEventListener(WebInspector.AnimationModel.Events.AnimationCanceled, this._animationCanceled, this);
     },
 
     /**
      * @param {!WebInspector.Target} target
      */
     _removeEventListeners: function(target)
     {
         var animationModel = WebInspector.AnimationModel.fromTarget(target);
-        animationModel.removeEventListener(WebInspector.AnimationModel.Events.AnimationCreated, this._animationCreated, this);
+        animationModel.removeEventListener(WebInspector.AnimationModel.Events.AnimationGroupStarted, this._animationGroupStarted, this);
         animationModel.removeEventListener(WebInspector.AnimationModel.Events.AnimationCanceled, this._animationCanceled, this);
     },
 
     /**
      * @param {?WebInspector.DOMNode} node
      */
     setNode: function(node)
     {
         for (var nodeUI of this._nodesMap.values())
             nodeUI.setNode(node);
@@ skipping 24 matching lines @@
          * @this {WebInspector.AnimationTimeline}
          */
         function playbackSliderInputHandler(event)
         {
             this._underlyingPlaybackRate = WebInspector.AnimationTimeline.GlobalPlaybackRates[event.target.value];
             this._updatePlaybackControls();
         }
 
         var container = createElementWithClass("div", "animation-timeline-header");
         var controls = container.createChild("div", "animation-controls");
-        container.createChild("div", "animation-timeline-markers");
+        this._previewContainer = container.createChild("div", "animation-timeline-buffer");
 
         var toolbar = new WebInspector.Toolbar(controls);
         toolbar.element.classList.add("animation-controls-toolbar");
         this._controlButton = new WebInspector.ToolbarButton(WebInspector.UIString("Replay timeline"), "replay-outline-toolbar-item");
         this._controlButton.addEventListener("click", this._controlButtonToggle.bind(this));
         toolbar.appendToolbarItem(this._controlButton);
 
         this._playbackLabel = controls.createChild("span", "animation-playback-label");
         this._playbackLabel.createTextChild("1x");
         this._playbackLabel.addEventListener("keydown", this._playbackLabelInput.bind(this));
@@ skipping 177 matching lines @@
      */
     _mainFrameNavigated: function(event)
     {
         this._reset();
         this._updateAnimationsPlaybackRate();
         if (this._scrubberPlayer)
             this._scrubberPlayer.cancel();
         delete this._scrubberPlayer;
         this._timelineScrubberHead.textContent = WebInspector.UIString(Number.millisToString(0));
         this._updateControlButton();
+        this._groupBuffer = [];
+        this._previewMap.clear();
+        this._previewContainer.removeChildren();
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
-    _animationCreated: function(event)
+    _animationGroupStarted: function(event)
     {
-        this._addAnimation(/** @type {!WebInspector.AnimationModel.Animation} */ (event.data.player), event.data.resetTimeline)
+        this._addAnimationGroup(/** @type {!WebInspector.AnimationModel.AnimationGroup} */(event.data));
+    },
+
+    /**
+     * @param {!WebInspector.AnimationModel.AnimationGroup} group
+     */
+    _addAnimationGroup: function(group)
+    {
+        /**
+         * @param {!WebInspector.AnimationModel.AnimationGroup} left
+         * @param {!WebInspector.AnimationModel.AnimationGroup} right
+         */
+        function startTimeComparator(left, right)
+        {
+            return left.startTime() > right.startTime();
+        }
+
+        this._groupBuffer.push(group);
+        this._groupBuffer.sort(startTimeComparator);
+        // Discard oldest groups from buffer if necessary
+        var groupsToDiscard = [];
+        while (this._groupBuffer.length > this._groupBufferSize) {
+            var toDiscard = this._groupBuffer.splice(this._groupBuffer[0] === this._selectedGroup ? 1 : 0, 1);
+            groupsToDiscard.push(toDiscard[0]);
+        }
+        for (var g of groupsToDiscard) {
+            this._previewMap.get(g).element.remove();
+            this._previewMap.delete(g);
+            // TODO(samli): needs to discard model too
+        }
+        // Generate preview
+        var preview = new WebInspector.AnimationGroupPreviewUI(group);
+        this._previewMap.set(group, preview);
+        this._previewContainer.appendChild(preview.element);
+        preview.element.addEventListener("click", this._selectAnimationGroup.bind(this, group));
+    },
+
+    /**
+     * @param {!WebInspector.AnimationModel.AnimationGroup} group
+     */
+    _selectAnimationGroup: function(group)
+    {
+        /**
+         * @param {!WebInspector.AnimationGroupPreviewUI} ui
+         * @param {!WebInspector.AnimationModel.AnimationGroup} group
+         * @this {!WebInspector.AnimationTimeline}
+         */
+        function applySelectionClass(ui, group)
+        {
+            ui.element.classList.toggle("selected", this._selectedGroup === group);
+        }
+
+        if (this._selectedGroup === group)
+            return;
+        this._selectedGroup = group;
+        this._previewMap.forEach(applySelectionClass, this);
+        this._reset();
+        for (var anim of group.animations())
+            this._addAnimation(anim);
+        this.scheduleRedraw();
     },
 
     /**
      * @param {!WebInspector.AnimationModel.Animation} animation
-     * @param {boolean} resetTimeline
      */
-    _addAnimation: function(animation, resetTimeline)
+    _addAnimation: function(animation)
     {
         /**
          * @param {?WebInspector.DOMNode} node
          * @this {WebInspector.AnimationTimeline}
          */
         function nodeResolved(node)
         {
             if (!node)
                 return;
             uiAnimation.setNode(node);
             node[this._symbol] = nodeUI;
         }
 
         if (this._emptyTimelineMessage) {
             this._emptyTimelineMessage.remove();
             delete this._emptyTimelineMessage;
         }
 
-        if (resetTimeline)
-            this._reset();
-
         // Ignore Web Animations custom effects & groups
         if (animation.type() === "WebAnimation" && animation.source().keyframesRule().keyframes().length === 0)
             return;
 
-        if (this._resizeWindow(animation))
-            this.scheduleRedraw();
+        this._resizeWindow(animation);
 
         var nodeUI = this._nodesMap.get(animation.source().backendNodeId());
         if (!nodeUI) {
             nodeUI = new WebInspector.AnimationTimeline.NodeUI(animation.source());
             this._animationsContainer.appendChild(nodeUI.element);
             this._nodesMap.set(animation.source().backendNodeId(), nodeUI);
         }
         var nodeRow = nodeUI.findRow(animation);
         var uiAnimation = new WebInspector.AnimationUI(animation, this, nodeRow.element);
         animation.source().deferredNode().resolve(nodeResolved.bind(this));
@@ skipping 45 matching lines @@
             line.setAttribute("y", 0);
             line.setAttribute("height", "100%");
             line.setAttribute("width", 1);
         }
         for (var time = 0; time < this.duration(); time += gridSize) {
             var gridWidth = time * this.pixelMsRatio();
             if (!lastDraw || gridWidth - lastDraw > 50) {
                 lastDraw = gridWidth;
                 var label = this._grid.createSVGChild("text", "animation-timeline-grid-label");
                 label.setAttribute("x", gridWidth + 5);
-                label.setAttribute("y", 35);
+                label.setAttribute("y", 15);
                 label.textContent = WebInspector.UIString(Number.millisToString(time));
             }
         }
     },
 
     scheduleRedraw: function() {
         if (this._redrawing)
             return;
         this._redrawing = true;
         this._animationsContainer.window().requestAnimationFrame(this._redraw.bind(this));
@@ skipping 143 matching lines @@
         this._timelineScrubberHead.window().requestAnimationFrame(this._updateScrubber.bind(this));
     },
 
     __proto__: WebInspector.VBox.prototype
 }
 
 /**
  * @constructor
  * @param {!WebInspector.AnimationModel.AnimationEffect} animationEffect
  */
-WebInspector.AnimationTimeline.NodeUI = function(animationEffect) {
+WebInspector.AnimationTimeline.NodeUI = function(animationEffect)
+{
     /**
      * @param {?WebInspector.DOMNode} node
      * @this {WebInspector.AnimationTimeline.NodeUI}
      */
     function nodeResolved(node)
     {
         if (!node)
             return;
         this._node = node;
         WebInspector.DOMPresentationUtils.decorateNodeLabel(node, this._description);
@@ skipping 114 matching lines @@
     this._svg = parentElement.createSVGChild("svg", "animation-ui");
     this._svg.setAttribute("height", WebInspector.AnimationUI.Options.AnimationSVGHeight);
     this._svg.style.marginLeft = "-" + WebInspector.AnimationUI.Options.AnimationMargin + "px";
     this._svg.addEventListener("mousedown", this._mouseDown.bind(this, WebInspector.AnimationUI.MouseEvents.AnimationDrag, null));
     this._activeIntervalGroup = this._svg.createSVGChild("g");
 
     /** @type {!Array.<{group: ?Element, animationLine: ?Element, keyframePoints: !Object.<number, !Element>, keyframeRender: !Object.<number, !Element>}>} */
     this._cachedElements = [];
 
     this._movementInMs = 0;
-    this.redraw();
+    this._color = WebInspector.AnimationUI.Color(this._animation);
 }
 
 /**
  * @enum {string}
  */
 WebInspector.AnimationUI.MouseEvents = {
     AnimationDrag: "AnimationDrag",
     KeyframeMove: "KeyframeMove",
     StartEndpointMove: "StartEndpointMove",
     FinishEndpointMove: "FinishEndpointMove"
@@ skipping 19 matching lines @@
     /**
      * @param {!Element} parentElement
      * @param {string} className
      */
     _createLine: function(parentElement, className)
     {
         var line = parentElement.createSVGChild("line", className);
         line.setAttribute("x1", WebInspector.AnimationUI.Options.AnimationMargin);
         line.setAttribute("y1", WebInspector.AnimationUI.Options.AnimationHeight);
         line.setAttribute("y2", WebInspector.AnimationUI.Options.AnimationHeight);
-        line.style.stroke = this._color();
+        line.style.stroke = this._color;
         return line;
     },
 
     /**
      * @param {number} iteration
      * @param {!Element} parentElement
      */
     _drawAnimationLine: function(iteration, parentElement)
     {
         var cache = this._cachedElements[iteration];
@@ skipping 29 matching lines @@
     _drawPoint: function(iteration, parentElement, x, keyframeIndex, attachEvents)
     {
         if (this._cachedElements[iteration].keyframePoints[keyframeIndex]) {
             this._cachedElements[iteration].keyframePoints[keyframeIndex].setAttribute("cx", x.toFixed(2));
             return;
         }
 
         var circle = parentElement.createSVGChild("circle", keyframeIndex <= 0 ? "animation-endpoint" : "animation-keyframe-point");
         circle.setAttribute("cx", x.toFixed(2));
         circle.setAttribute("cy", WebInspector.AnimationUI.Options.AnimationHeight);
-        circle.style.stroke = this._color();
+        circle.style.stroke = this._color;
         circle.setAttribute("r", WebInspector.AnimationUI.Options.AnimationMargin / 2);
 
         if (keyframeIndex <= 0)
-            circle.style.fill = this._color();
+            circle.style.fill = this._color;
 
         this._cachedElements[iteration].keyframePoints[keyframeIndex] = circle;
 
         if (!attachEvents)
             return;
 
         if (keyframeIndex === 0) {
             circle.addEventListener("mousedown", this._mouseDown.bind(this, WebInspector.AnimationUI.MouseEvents.StartEndpointMove, keyframeIndex));
         } else if (keyframeIndex === -1) {
             circle.addEventListener("mousedown", this._mouseDown.bind(this, WebInspector.AnimationUI.MouseEvents.FinishEndpointMove, keyframeIndex));
@@ skipping 28 matching lines @@
         }
 
         var bezier = WebInspector.Geometry.CubicBezier.parse(easing);
         var cache = this._cachedElements[iteration].keyframeRender;
         if (!cache[keyframeIndex])
             cache[keyframeIndex] = bezier ? parentElement.createSVGChild("path", "animation-keyframe") : parentElement.createSVGChild("g", "animation-keyframe-step");
         var group = cache[keyframeIndex];
         group.style.transform = "translateX(" + leftDistance.toFixed(2) + "px)";
 
         if (bezier) {
-            group.style.fill = this._color();
+            group.style.fill = this._color;
             WebInspector.BezierUI.drawVelocityChart(bezier, group, width);
         } else {
             var stepFunction = WebInspector.AnimationTimeline.StepTimingFunction.parse(easing);
             group.removeChildren();
             const offsetMap = {"start": 0, "middle": 0.5, "end": 1};
             const offsetWeight = offsetMap[stepFunction.stepAtPosition];
             for (var i = 0; i < stepFunction.steps; i++)
-                createStepLine(group, (i + offsetWeight) * width / stepFunction.steps, this._color());
+                createStepLine(group, (i + offsetWeight) * width / stepFunction.steps, this._color);
         }
     },
 
     redraw: function()
     {
         var durationWithDelay = this._delay() + this._duration() * this._animation.source().iterations() + this._animation.source().endDelay();
         var leftMargin = ((this._animation.startTime() - this._timeline.startTime()) * this._timeline.pixelMsRatio());
         var maxWidth = this._timeline.width() - WebInspector.AnimationUI.Options.AnimationMargin - leftMargin;
         var svgWidth = Math.min(maxWidth, durationWithDelay * this._timeline.pixelMsRatio());
 
@@ skipping 138 matching lines @@
 
         // Commit changes
         if (this._mouseEventType === WebInspector.AnimationUI.MouseEvents.KeyframeMove) {
             this._keyframes[this._keyframeMoved].setOffset(this._offset(this._keyframeMoved));
         } else {
             var delay = this._delay();
             var duration = this._duration();
             this._setDelay(delay);
             this._setDuration(duration);
             if (this._animation.type() !== "CSSAnimation") {
-                for (var target of WebInspector.targetManager.targets(WebInspector.Target.Type.Page))
+                var target = WebInspector.targetManager.mainTarget();
+                if (target)
                     target.animationAgent().setTiming(this._animation.id(), duration, delay);
             }
         }
 
         this._movementInMs = 0;
         this.redraw();
 
         this._parentElement.ownerDocument.removeEventListener("mousemove", this._mouseMoveHandler);
         this._parentElement.ownerDocument.removeEventListener("mouseup", this._mouseUpHandler);
         delete this._mouseMoveHandler;
@@ skipping 45 matching lines @@
      * @param {string} name
      * @param {string} value
      */
     _setNodeStyle: function(name, value)
     {
         var style = this._node.getAttribute("style") || "";
         if (style)
             style = style.replace(new RegExp("\\s*(-webkit-)?" + name + ":[^;]*;?\\s*", "g"), "");
         var valueString = name + ": " + value;
         this._node.setAttributeValue("style", style + " " + valueString + "; -webkit-" + valueString + ";");
-    },
-
-    /**
-     * @return {string}
-     */
-    _color: function()
-    {
-        /**
-         * @param {string} string
-         * @return {number}
-         */
-        function hash(string)
-        {
-            var hash = 0;
-            for (var i = 0; i < string.length; i++)
-                hash = (hash << 5) + hash + string.charCodeAt(i);
-            return Math.abs(hash);
-        }
-
-        if (!this._selectedColor) {
-            var names = Object.keys(WebInspector.AnimationUI.Colors);
-            var color = WebInspector.AnimationUI.Colors[names[hash(this._animation.name() || this._animation.id()) % names.length]];
-            this._selectedColor = color.asString(WebInspector.Color.Format.RGB);
-        }
-        return this._selectedColor;
     }
 }
 
 WebInspector.AnimationUI.Options = {
     AnimationHeight: 32,
     AnimationSVGHeight: 80,
     AnimationMargin: 7,
     EndpointsClickRegionSize: 10,
     GridCanvasHeight: 40
 }
 
 WebInspector.AnimationUI.Colors = {
     "Purple": WebInspector.Color.parse("#9C27B0"),
     "Light Blue": WebInspector.Color.parse("#03A9F4"),
     "Deep Orange": WebInspector.Color.parse("#FF5722"),
     "Blue": WebInspector.Color.parse("#5677FC"),
     "Lime": WebInspector.Color.parse("#CDDC39"),
+    "Blue Grey": WebInspector.Color.parse("#607D8B"),
     "Pink": WebInspector.Color.parse("#E91E63"),
     "Green": WebInspector.Color.parse("#0F9D58"),
     "Brown": WebInspector.Color.parse("#795548"),
     "Cyan": WebInspector.Color.parse("#00BCD4")
 }
+
+
+/**
+ * @param {!WebInspector.AnimationModel.Animation} animation
+ * @return {string}
+ */
+WebInspector.AnimationUI.Color = function(animation)
+{
+    /**
+     * @param {string} string
+     * @return {number}
+     */
+    function hash(string)
+    {
+        var hash = 0;
+        for (var i = 0; i < string.length; i++)
+            hash = (hash << 5) + hash + string.charCodeAt(i);
+        return Math.abs(hash);
+    }
+
+    var names = Object.keys(WebInspector.AnimationUI.Colors);
+    var color = WebInspector.AnimationUI.Colors[names[hash(animation.name() || animation.id()) % names.length]];
+    return color.asString(WebInspector.Color.Format.RGB);
+}