Add m-esr52 at 52.6.0

1 files changed, 197 insertions, 0 deletions

diff --git a/mobile/android/chrome/content/FindHelper.js b/mobile/android/chrome/content/FindHelper.js
new file mode 100644
index 000000000..037b182d6
--- /dev/null
+++ b/mobile/android/chrome/content/FindHelper.js
@@ -0,0 +1,197 @@
+/* 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";
+
+var FindHelper = {
+  _finder: null,
+  _targetTab: null,
+  _initialViewport: null,
+  _viewportChanged: false,
+  _result: null,
+
+  // Start of nsIObserver implementation.
+
+  observe: function(aMessage, aTopic, aData) {
+    switch(aTopic) {
+      case "FindInPage:Opened": {
+        this._findOpened();
+        break;
+      }
+
+      case "Tab:Selected": {
+        // Allow for page switching.
+        this._uninit();
+        break;
+      }
+
+      case "FindInPage:Closed":
+        this._uninit();
+        this._findClosed();
+        break;
+    }
+  },
+
+  /**
+   * When the FindInPageBar opens/ becomes visible, it's time to:
+   * 1. Add listeners for other message types sent from the FindInPageBar
+   * 2. initialize the Finder instance, if necessary.
+   */
+  _findOpened: function() {
+    Messaging.addListener(data => this.doFind(data), "FindInPage:Find");
+    Messaging.addListener(data => this.findAgain(data, false), "FindInPage:Next");
+    Messaging.addListener(data => this.findAgain(data, true), "FindInPage:Prev");
+
+    // Initialize the finder component for the current page by performing a fake find.
+    this._init();
+    this._finder.requestMatchesCount("");
+  },
+
+  /**
+   * Fetch the Finder instance from the active tabs' browser and start tracking
+   * the active viewport.
+   */
+  _init: function() {
+    // If there's no find in progress, start one.
+    if (this._finder) {
+      return;
+    }
+
+    this._targetTab = BrowserApp.selectedTab;
+    try {
+      this._finder = this._targetTab.browser.finder;
+    } catch (e) {
+      throw new Error("FindHelper: " + e + "\n" +
+        "JS stack: \n" + (e.stack || Components.stack.formattedStack));
+    }
+
+    this._finder.addResultListener(this);
+    this._initialViewport = JSON.stringify(this._targetTab.getViewport());
+    this._viewportChanged = false;
+  },
+
+  /**
+   * Detach from the Finder instance (so stop listening for messages) and stop
+   * tracking the active viewport.
+   */
+  _uninit: function() {
+    // If there's no find in progress, there's nothing to clean up.
+    if (!this._finder) {
+      return;
+    }
+
+    this._finder.removeSelection();
+    this._finder.removeResultListener(this);
+    this._finder = null;
+    this._targetTab = null;
+    this._initialViewport = null;
+    this._viewportChanged = false;
+  },
+
+  /**
+   * When the FindInPageBar closes, it's time to stop listening for its messages.
+   */
+  _findClosed: function() {
+    Messaging.removeListener("FindInPage:Find");
+    Messaging.removeListener("FindInPage:Next");
+    Messaging.removeListener("FindInPage:Prev");
+  },
+
+  /**
+   * Start an asynchronous find-in-page operation, using the current Finder
+   * instance and request to count the amount of matches.
+   * If no Finder instance is currently active, we'll lazily initialize it here.
+   *
+   * @param  {String} searchString Word to search for in the current document
+   * @return {Object}              Echo of the current find action
+   */
+  doFind: function(searchString) {
+    if (!this._finder) {
+      this._init();
+    }
+
+    this._finder.fastFind(searchString, false);
+    return { searchString, findBackwards: false };
+  },
+
+  /**
+   * Restart the same find-in-page operation as before via `doFind()`. If we
+   * haven't called `doFind()`, we simply kick off a regular find.
+   *
+   * @param  {String}  searchString  Word to search for in the current document
+   * @param  {Boolean} findBackwards Direction to search in
+   * @return {Object}                Echo of the current find action
+   */
+  findAgain: function(searchString, findBackwards) {
+    // This always happens if the user taps next/previous after re-opening the
+    // search bar, and not only forces _init() but also an initial fastFind(STRING)
+    // before any findAgain(DIRECTION).
+    if (!this._finder) {
+      return this.doFind(searchString);
+    }
+
+    this._finder.findAgain(findBackwards, false, false);
+    return { searchString, findBackwards };
+  },
+
+  // Start of Finder.jsm listener implementation.
+
+  /**
+   * Pass along the count results to FindInPageBar for display. The result that
+   * is sent to the FindInPageBar is augmented with the current find-in-page count
+   * limit.
+   *
+   * @param {Object} result Result coming from the Finder instance that contains
+   *                        the following properties:
+   *                        - {Number} total   The total amount of matches found
+   *                        - {Number} current The index of current found range
+   *                                           in the document
+   */
+  onMatchesCountResult: function(result) {
+    this._result = result;
+
+    Messaging.sendRequest(Object.assign({
+      type: "FindInPage:MatchesCountResult"
+    }, this._result));
+  },
+
+  /**
+   * When a find-in-page action finishes, this method is invoked. This is mainly
+   * used at the moment to detect if the current viewport has changed, which might
+   * be indicated by not finding a string in the current page.
+   *
+   * @param {Object} aData A dictionary, representing the find result, which
+   *                       contains the following properties:
+   *                       - {String}  searchString  Word that was searched for
+   *                                                 in the current document
+   *                       - {Number}  result        One of the following
+   *                                                 Ci.nsITypeAheadFind.* result
+   *                                                 indicators: FIND_FOUND,
+   *                                                 FIND_NOTFOUND, FIND_WRAPPED,
+   *                                                 FIND_PENDING
+   *                       - {Boolean} findBackwards Whether the search direction
+   *                                                 was backwards
+   *                       - {Boolean} findAgain     Whether the previous search
+   *                                                 was repeated
+   *                       - {Boolean} drawOutline   Whether we may (re-)draw the
+   *                                                 outline of a hyperlink
+   *                       - {Boolean} linksOnly     Whether links-only mode was
+   *                                                 active
+   */
+  onFindResult: function(aData) {
+    if (aData.result == Ci.nsITypeAheadFind.FIND_NOTFOUND) {
+      if (this._viewportChanged) {
+        if (this._targetTab != BrowserApp.selectedTab) {
+          // this should never happen
+          Cu.reportError("Warning: selected tab changed during find!");
+          // fall through and restore viewport on the initial tab anyway
+        }
+        this._targetTab.sendViewportUpdate();
+      }
+    } else {
+      // Disabled until bug 1014113 is fixed
+      // ZoomHelper.zoomToRect(aData.rect);
+      this._viewportChanged = true;
+    }
+  }
+};