1 files changed, 131 insertions, 0 deletions
diff --git a/devtools/client/inspector/animation/components/CurrentTimeScrubber.js b/devtools/client/inspector/animation/components/CurrentTimeScrubber.js
new file mode 100644
index 0000000000..8b87e32eff
--- /dev/null
+++ b/devtools/client/inspector/animation/components/CurrentTimeScrubber.js
@@ -0,0 +1,131 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const DevToolsUtils = require("resource://devtools/shared/DevToolsUtils.js");
+const {
+  createRef,
+  PureComponent,
+} = require("resource://devtools/client/shared/vendor/react.js");
+const dom = require("resource://devtools/client/shared/vendor/react-dom-factories.js");
+const PropTypes = require("resource://devtools/client/shared/vendor/react-prop-types.js");
+
+class CurrentTimeScrubber extends PureComponent {
+  static get propTypes() {
+    return {
+      addAnimationsCurrentTimeListener: PropTypes.func.isRequired,
+      direction: PropTypes.string.isRequired,
+      removeAnimationsCurrentTimeListener: PropTypes.func.isRequired,
+      setAnimationsCurrentTime: PropTypes.func.isRequired,
+      timeScale: PropTypes.object.isRequired,
+    };
+  }
+
+  constructor(props) {
+    super(props);
+
+    this._ref = createRef();
+
+    const { addAnimationsCurrentTimeListener } = props;
+    this.onCurrentTimeUpdated = this.onCurrentTimeUpdated.bind(this);
+    this.onMouseDown = this.onMouseDown.bind(this);
+    this.onMouseMove = this.onMouseMove.bind(this);
+    this.onMouseUp = this.onMouseUp.bind(this);
+
+    addAnimationsCurrentTimeListener(this.onCurrentTimeUpdated);
+  }
+
+  componentDidMount() {
+    const current = this._ref.current;
+    current.addEventListener("mousedown", this.onMouseDown);
+    this._scrubber = current.querySelector(".current-time-scrubber");
+  }
+
+  componentWillUnmount() {
+    const { removeAnimationsCurrentTimeListener } = this.props;
+    removeAnimationsCurrentTimeListener(this.onCurrentTimeUpdated);
+  }
+
+  onCurrentTimeUpdated(currentTime) {
+    const { timeScale } = this.props;
+
+    const position = currentTime / timeScale.getDuration();
+    // onCurrentTimeUpdated is bound to requestAnimationFrame.
+    // As to update the component too frequently has performance issue if React controlled,
+    // update raw component directly. See Bug 1699039.
+    this._scrubber.style.marginInlineStart = `${position * 100}%`;
+  }
+
+  onMouseDown(event) {
+    event.stopPropagation();
+    const current = this._ref.current;
+    this.controllerArea = current.getBoundingClientRect();
+    this.listenerTarget = DevToolsUtils.getTopWindow(current.ownerGlobal);
+    this.listenerTarget.addEventListener("mousemove", this.onMouseMove);
+    this.listenerTarget.addEventListener("mouseup", this.onMouseUp);
+    this.decorationTarget = current.closest(".animation-list-container");
+    this.decorationTarget.classList.add("active-scrubber");
+
+    this.updateAnimationsCurrentTime(event.pageX, true);
+  }
+
+  onMouseMove(event) {
+    event.stopPropagation();
+    this.isMouseMoved = true;
+    this.updateAnimationsCurrentTime(event.pageX);
+  }
+
+  onMouseUp(event) {
+    event.stopPropagation();
+
+    if (this.isMouseMoved) {
+      this.updateAnimationsCurrentTime(event.pageX, true);
+      this.isMouseMoved = null;
+    }
+
+    this.uninstallListeners();
+  }
+
+  uninstallListeners() {
+    this.listenerTarget.removeEventListener("mousemove", this.onMouseMove);
+    this.listenerTarget.removeEventListener("mouseup", this.onMouseUp);
+    this.listenerTarget = null;
+    this.decorationTarget.classList.remove("active-scrubber");
+    this.decorationTarget = null;
+    this.controllerArea = null;
+  }
+
+  updateAnimationsCurrentTime(pageX, needRefresh) {
+    const { direction, setAnimationsCurrentTime, timeScale } = this.props;
+
+    let progressRate =
+      (pageX - this.controllerArea.x) / this.controllerArea.width;
+
+    if (progressRate < 0.0) {
+      progressRate = 0.0;
+    } else if (progressRate > 1.0) {
+      progressRate = 1.0;
+    }
+
+    const time =
+      direction === "ltr"
+        ? progressRate * timeScale.getDuration()
+        : (1 - progressRate) * timeScale.getDuration();
+
+    setAnimationsCurrentTime(time, needRefresh);
+  }
+
+  render() {
+    return dom.div(
+      {
+        className: "current-time-scrubber-area",
+        ref: this._ref,
+      },
+      dom.div({ className: "indication-bar current-time-scrubber" })
+    );
+  }
+}
+
+module.exports = CurrentTimeScrubber;