2 files changed, 124 insertions, 0 deletions
diff --git a/devtools/client/inspector/animation/reducers/animations.js b/devtools/client/inspector/animation/reducers/animations.js
new file mode 100644
index 0000000000..ead3e84147
--- /dev/null
+++ b/devtools/client/inspector/animation/reducers/animations.js
@@ -0,0 +1,117 @@
+/* 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 {
+  UPDATE_ANIMATIONS,
+  UPDATE_DETAIL_VISIBILITY,
+  UPDATE_ELEMENT_PICKER_ENABLED,
+  UPDATE_HIGHLIGHTED_NODE,
+  UPDATE_PLAYBACK_RATES,
+  UPDATE_SELECTED_ANIMATION,
+  UPDATE_SIDEBAR_SIZE,
+} = require("resource://devtools/client/inspector/animation/actions/index.js");
+
+loader.lazyRequireGetter(
+  this,
+  "TimeScale",
+  "resource://devtools/client/inspector/animation/utils/timescale.js"
+);
+
+const INITIAL_STATE = {
+  animations: [],
+  detailVisibility: false,
+  elementPickerEnabled: false,
+  highlightedNode: null,
+  playbackRates: [],
+  selectedAnimation: null,
+  sidebarSize: {
+    height: 0,
+    width: 0,
+  },
+  timeScale: null,
+};
+
+const reducers = {
+  [UPDATE_ANIMATIONS](state, { animations }) {
+    let detailVisibility = state.detailVisibility;
+    let selectedAnimation = state.selectedAnimation;
+
+    if (
+      !state.selectedAnimation ||
+      !animations.find(
+        animation => animation.actorID === selectedAnimation.actorID
+      )
+    ) {
+      selectedAnimation = animations.length === 1 ? animations[0] : null;
+      detailVisibility = !!selectedAnimation;
+    }
+
+    const playbackRates = getPlaybackRates(state.playbackRates, animations);
+
+    return Object.assign({}, state, {
+      animations,
+      detailVisibility,
+      playbackRates,
+      selectedAnimation,
+      timeScale: new TimeScale(animations),
+    });
+  },
+
+  [UPDATE_DETAIL_VISIBILITY](state, { detailVisibility }) {
+    const selectedAnimation = detailVisibility ? state.selectedAnimation : null;
+
+    return Object.assign({}, state, {
+      detailVisibility,
+      selectedAnimation,
+    });
+  },
+
+  [UPDATE_ELEMENT_PICKER_ENABLED](state, { elementPickerEnabled }) {
+    return Object.assign({}, state, {
+      elementPickerEnabled,
+    });
+  },
+
+  [UPDATE_HIGHLIGHTED_NODE](state, { highlightedNode }) {
+    return Object.assign({}, state, {
+      highlightedNode,
+    });
+  },
+
+  [UPDATE_PLAYBACK_RATES](state) {
+    return Object.assign({}, state, {
+      playbackRates: getPlaybackRates([], state.animations),
+    });
+  },
+
+  [UPDATE_SELECTED_ANIMATION](state, { selectedAnimation }) {
+    const detailVisibility = !!selectedAnimation;
+
+    return Object.assign({}, state, {
+      detailVisibility,
+      selectedAnimation,
+    });
+  },
+
+  [UPDATE_SIDEBAR_SIZE](state, { sidebarSize }) {
+    return Object.assign({}, state, {
+      sidebarSize,
+    });
+  },
+};
+
+function getPlaybackRates(basePlaybackRate, animations) {
+  return [
+    ...new Set(
+      animations.map(a => a.state.playbackRate).concat(basePlaybackRate)
+    ),
+  ];
+}
+
+module.exports = function (state = INITIAL_STATE, action) {
+  const reducer = reducers[action.type];
+  return reducer ? reducer(state, action) : state;
+};
diff --git a/devtools/client/inspector/animation/reducers/moz.build b/devtools/client/inspector/animation/reducers/moz.build
new file mode 100644
index 0000000000..8b20a9f6cd
--- /dev/null
+++ b/devtools/client/inspector/animation/reducers/moz.build
@@ -0,0 +1,7 @@
+# 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/.
+
+DevToolsModules(
+    "animations.js",
+)