1 files changed, 287 insertions, 0 deletions
diff --git a/browser/components/extensions/ext-pageAction.js b/browser/components/extensions/ext-pageAction.js
new file mode 100644
index 000000000..153f05d7a
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+++ b/browser/components/extensions/ext-pageAction.js
@@ -0,0 +1,287 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+Cu.import("resource://gre/modules/Task.jsm");
+Cu.import("resource://gre/modules/ExtensionUtils.jsm");
+var {
+  EventManager,
+  IconDetails,
+} = ExtensionUtils;
+
+// WeakMap[Extension -> PageAction]
+var pageActionMap = new WeakMap();
+
+// Handles URL bar icons, including the |page_action| manifest entry
+// and associated API.
+function PageAction(options, extension) {
+  this.extension = extension;
+  this.id = makeWidgetId(extension.id) + "-page-action";
+
+  this.tabManager = TabManager.for(extension);
+
+  this.defaults = {
+    show: false,
+    title: options.default_title || extension.name,
+    icon: IconDetails.normalize({path: options.default_icon}, extension),
+    popup: options.default_popup || "",
+  };
+
+  this.browserStyle = options.browser_style || false;
+  if (options.browser_style === null) {
+    this.extension.logger.warn("Please specify whether you want browser_style " +
+                               "or not in your page_action options.");
+  }
+
+  this.tabContext = new TabContext(tab => Object.create(this.defaults),
+                                   extension);
+
+  this.tabContext.on("location-change", this.handleLocationChange.bind(this)); // eslint-disable-line mozilla/balanced-listeners
+
+  // WeakMap[ChromeWindow -> <xul:image>]
+  this.buttons = new WeakMap();
+
+  EventEmitter.decorate(this);
+}
+
+PageAction.prototype = {
+  // Returns the value of the property |prop| for the given tab, where
+  // |prop| is one of "show", "title", "icon", "popup".
+  getProperty(tab, prop) {
+    return this.tabContext.get(tab)[prop];
+  },
+
+  // Sets the value of the property |prop| for the given tab to the
+  // given value, symmetrically to |getProperty|.
+  //
+  // If |tab| is currently selected, updates the page action button to
+  // reflect the new value.
+  setProperty(tab, prop, value) {
+    if (value != null) {
+      this.tabContext.get(tab)[prop] = value;
+    } else {
+      delete this.tabContext.get(tab)[prop];
+    }
+
+    if (tab.selected) {
+      this.updateButton(tab.ownerGlobal);
+    }
+  },
+
+  // Updates the page action button in the given window to reflect the
+  // properties of the currently selected tab:
+  //
+  // Updates "tooltiptext" and "aria-label" to match "title" property.
+  // Updates "image" to match the "icon" property.
+  // Shows or hides the icon, based on the "show" property.
+  updateButton(window) {
+    let tabData = this.tabContext.get(window.gBrowser.selectedTab);
+
+    if (!(tabData.show || this.buttons.has(window))) {
+      // Don't bother creating a button for a window until it actually
+      // needs to be shown.
+      return;
+    }
+
+    let button = this.getButton(window);
+
+    if (tabData.show) {
+      // Update the title and icon only if the button is visible.
+
+      let title = tabData.title || this.extension.name;
+      button.setAttribute("tooltiptext", title);
+      button.setAttribute("aria-label", title);
+
+      // These URLs should already be properly escaped, but make doubly sure CSS
+      // string escape characters are escaped here, since they could lead to a
+      // sandbox break.
+      let escape = str => str.replace(/[\\\s"]/g, encodeURIComponent);
+
+      let getIcon = size => escape(IconDetails.getPreferredIcon(tabData.icon, this.extension, size).icon);
+
+      button.setAttribute("style", `
+        --webextension-urlbar-image: url("${getIcon(16)}");
+        --webextension-urlbar-image-2x: url("${getIcon(32)}");
+      `);
+
+      button.classList.add("webextension-page-action");
+    }
+
+    button.hidden = !tabData.show;
+  },
+
+  // Create an |image| node and add it to the |urlbar-icons|
+  // container in the given window.
+  addButton(window) {
+    let document = window.document;
+
+    let button = document.createElement("image");
+    button.id = this.id;
+    button.setAttribute("class", "urlbar-icon");
+
+    button.addEventListener("click", event => { // eslint-disable-line mozilla/balanced-listeners
+      if (event.button == 0) {
+        this.handleClick(window);
+      }
+    });
+
+    document.getElementById("urlbar-icons").appendChild(button);
+
+    return button;
+  },
+
+  // Returns the page action button for the given window, creating it if
+  // it doesn't already exist.
+  getButton(window) {
+    if (!this.buttons.has(window)) {
+      let button = this.addButton(window);
+      this.buttons.set(window, button);
+    }
+
+    return this.buttons.get(window);
+  },
+
+  /**
+   * Triggers this page action for the given window, with the same effects as
+   * if it were clicked by a user.
+   *
+   * This has no effect if the page action is hidden for the selected tab.
+   *
+   * @param {Window} window
+   */
+  triggerAction(window) {
+    let pageAction = pageActionMap.get(this.extension);
+    if (pageAction.getProperty(window.gBrowser.selectedTab, "show")) {
+      pageAction.handleClick(window);
+    }
+  },
+
+  // Handles a click event on the page action button for the given
+  // window.
+  // If the page action has a |popup| property, a panel is opened to
+  // that URL. Otherwise, a "click" event is emitted, and dispatched to
+  // the any click listeners in the add-on.
+  handleClick(window) {
+    let tab = window.gBrowser.selectedTab;
+    let popupURL = this.tabContext.get(tab).popup;
+
+    this.tabManager.addActiveTabPermission(tab);
+
+    // If the widget has a popup URL defined, we open a popup, but do not
+    // dispatch a click event to the extension.
+    // If it has no popup URL defined, we dispatch a click event, but do not
+    // open a popup.
+    if (popupURL) {
+      new PanelPopup(this.extension, this.getButton(window), popupURL,
+                     this.browserStyle);
+    } else {
+      this.emit("click", tab);
+    }
+  },
+
+  handleLocationChange(eventType, tab, fromBrowse) {
+    if (fromBrowse) {
+      this.tabContext.clear(tab);
+    }
+    this.updateButton(tab.ownerGlobal);
+  },
+
+  shutdown() {
+    this.tabContext.shutdown();
+
+    for (let window of WindowListManager.browserWindows()) {
+      if (this.buttons.has(window)) {
+        this.buttons.get(window).remove();
+      }
+    }
+  },
+};
+
+/* eslint-disable mozilla/balanced-listeners */
+extensions.on("manifest_page_action", (type, directive, extension, manifest) => {
+  let pageAction = new PageAction(manifest.page_action, extension);
+  pageActionMap.set(extension, pageAction);
+});
+
+extensions.on("shutdown", (type, extension) => {
+  if (pageActionMap.has(extension)) {
+    pageActionMap.get(extension).shutdown();
+    pageActionMap.delete(extension);
+  }
+});
+/* eslint-enable mozilla/balanced-listeners */
+
+PageAction.for = extension => {
+  return pageActionMap.get(extension);
+};
+
+global.pageActionFor = PageAction.for;
+
+extensions.registerSchemaAPI("pageAction", "addon_parent", context => {
+  let {extension} = context;
+  return {
+    pageAction: {
+      onClicked: new EventManager(context, "pageAction.onClicked", fire => {
+        let listener = (evt, tab) => {
+          fire(TabManager.convert(extension, tab));
+        };
+        let pageAction = PageAction.for(extension);
+
+        pageAction.on("click", listener);
+        return () => {
+          pageAction.off("click", listener);
+        };
+      }).api(),
+
+      show(tabId) {
+        let tab = TabManager.getTab(tabId, context);
+        PageAction.for(extension).setProperty(tab, "show", true);
+      },
+
+      hide(tabId) {
+        let tab = TabManager.getTab(tabId, context);
+        PageAction.for(extension).setProperty(tab, "show", false);
+      },
+
+      setTitle(details) {
+        let tab = TabManager.getTab(details.tabId, context);
+
+        // Clear the tab-specific title when given a null string.
+        PageAction.for(extension).setProperty(tab, "title", details.title || null);
+      },
+
+      getTitle(details) {
+        let tab = TabManager.getTab(details.tabId, context);
+
+        let title = PageAction.for(extension).getProperty(tab, "title");
+        return Promise.resolve(title);
+      },
+
+      setIcon(details) {
+        let tab = TabManager.getTab(details.tabId, context);
+
+        let icon = IconDetails.normalize(details, extension, context);
+        PageAction.for(extension).setProperty(tab, "icon", icon);
+      },
+
+      setPopup(details) {
+        let tab = TabManager.getTab(details.tabId, context);
+
+        // Note: Chrome resolves arguments to setIcon relative to the calling
+        // context, but resolves arguments to setPopup relative to the extension
+        // root.
+        // For internal consistency, we currently resolve both relative to the
+        // calling context.
+        let url = details.popup && context.uri.resolve(details.popup);
+        PageAction.for(extension).setProperty(tab, "popup", url);
+      },
+
+      getPopup(details) {
+        let tab = TabManager.getTab(details.tabId, context);
+
+        let popup = PageAction.for(extension).getProperty(tab, "popup");
+        return Promise.resolve(popup);
+      },
+    },
+  };
+});