1 files changed, 103 insertions, 0 deletions
diff --git a/devtools/client/webaudioeditor/views/utils.js b/devtools/client/webaudioeditor/views/utils.js
new file mode 100644
index 000000000..6d6a96946
--- /dev/null
+++ b/devtools/client/webaudioeditor/views/utils.js
@@ -0,0 +1,103 @@
+/* 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";
+
+/**
+ * Takes an element in an SVG graph and iterates over
+ * ancestors until it finds the graph node container. If not found,
+ * returns null.
+ */
+
+function findGraphNodeParent(el) {
+  // Some targets may not contain `classList` property
+  if (!el.classList)
+    return null;
+
+  while (!el.classList.contains("nodes")) {
+    if (el.classList.contains("audionode"))
+      return el;
+    else
+      el = el.parentNode;
+  }
+  return null;
+}
+
+/**
+ * Object for use with `mix` into a view.
+ * Must have the following properties defined on the view:
+ * - `el`
+ * - `button`
+ * - `_collapseString`
+ * - `_expandString`
+ * - `_toggleEvent`
+ *
+ * Optional properties on the view can be defined to specify default
+ * visibility options.
+ * - `_animated`
+ * - `_delayed`
+ */
+var ToggleMixin = {
+
+  bindToggle: function () {
+    this._onToggle = this._onToggle.bind(this);
+    this.button.addEventListener("mousedown", this._onToggle, false);
+  },
+
+  unbindToggle: function () {
+    this.button.removeEventListener("mousedown", this._onToggle);
+  },
+
+  show: function () {
+    this._viewController({ visible: true });
+  },
+
+  hide: function () {
+    this._viewController({ visible: false });
+  },
+
+  hideImmediately: function () {
+    this._viewController({ visible: false, delayed: false, animated: false });
+  },
+
+  /**
+   * Returns a boolean indicating whether or not the view.
+   * is currently being shown.
+   */
+  isVisible: function () {
+    return !this.el.classList.contains("pane-collapsed");
+  },
+
+  /**
+   * Toggles the visibility of the view.
+   *
+   * @param object visible
+   *        - visible: boolean indicating whether the panel should be shown or not
+   *        - animated: boolean indiciating whether the pane should be animated
+   *        - delayed: boolean indicating whether the pane's opening should wait
+   *                   a few cycles or not
+   */
+  _viewController: function ({ visible, animated, delayed }) {
+    let flags = {
+      visible: visible,
+      animated: animated != null ? animated : !!this._animated,
+      delayed: delayed != null ? delayed : !!this._delayed,
+      callback: () => window.emit(this._toggleEvent, visible)
+    };
+
+    ViewHelpers.togglePane(flags, this.el);
+
+    if (flags.visible) {
+      this.button.classList.remove("pane-collapsed");
+      this.button.setAttribute("tooltiptext", this._collapseString);
+    }
+    else {
+      this.button.classList.add("pane-collapsed");
+      this.button.setAttribute("tooltiptext", this._expandString);
+    }
+  },
+
+  _onToggle: function () {
+    this._viewController({ visible: !this.isVisible() });
+  }
+};