1 files changed, 81 insertions, 0 deletions
diff --git a/devtools/client/animationinspector/components/keyframes.js b/devtools/client/animationinspector/components/keyframes.js
new file mode 100644
index 000000000..a017935a3
--- /dev/null
+++ b/devtools/client/animationinspector/components/keyframes.js
@@ -0,0 +1,81 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* 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 EventEmitter = require("devtools/shared/event-emitter");
+const {createNode} = require("devtools/client/animationinspector/utils");
+
+/**
+ * UI component responsible for displaying a list of keyframes.
+ */
+function Keyframes() {
+  EventEmitter.decorate(this);
+  this.onClick = this.onClick.bind(this);
+}
+
+exports.Keyframes = Keyframes;
+
+Keyframes.prototype = {
+  init: function (containerEl) {
+    this.containerEl = containerEl;
+
+    this.keyframesEl = createNode({
+      parent: this.containerEl,
+      attributes: {"class": "keyframes"}
+    });
+
+    this.containerEl.addEventListener("click", this.onClick);
+  },
+
+  destroy: function () {
+    this.containerEl.removeEventListener("click", this.onClick);
+    this.keyframesEl.remove();
+    this.containerEl = this.keyframesEl = this.animation = null;
+  },
+
+  render: function ({keyframes, propertyName, animation}) {
+    this.keyframes = keyframes;
+    this.propertyName = propertyName;
+    this.animation = animation;
+
+    let iterationStartOffset =
+      animation.state.iterationStart % 1 == 0
+      ? 0
+      : 1 - animation.state.iterationStart % 1;
+
+    this.keyframesEl.classList.add(animation.state.type);
+    for (let frame of this.keyframes) {
+      let offset = frame.offset + iterationStartOffset;
+      createNode({
+        parent: this.keyframesEl,
+        attributes: {
+          "class": "frame",
+          "style": `left:${offset * 100}%;`,
+          "data-offset": frame.offset,
+          "data-property": propertyName,
+          "title": frame.value
+        }
+      });
+    }
+  },
+
+  onClick: function (e) {
+    // If the click happened on a frame, tell our parent about it.
+    if (!e.target.classList.contains("frame")) {
+      return;
+    }
+
+    e.stopPropagation();
+    this.emit("frame-selected", {
+      animation: this.animation,
+      propertyName: this.propertyName,
+      offset: parseFloat(e.target.dataset.offset),
+      value: e.target.getAttribute("title"),
+      x: e.target.offsetLeft + e.target.closest(".frames").offsetLeft
+    });
+  }
+};