gecko/browser/metro/base/content/contenthandlers/FindHandler.js

/* 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/. */

dump("### FindHandler.js loaded\n");

var FindHandler = {
  get _fastFind() {
    delete this._fastFind;
    this._fastFind = Cc["@mozilla.org/typeaheadfind;1"].createInstance(Ci.nsITypeAheadFind);
    this._fastFind.init(docShell);
    return this._fastFind;
  },

  init: function findHandlerInit() {
    addMessageListener("FindAssist:Find", this);
    addMessageListener("FindAssist:Next", this);
    addMessageListener("FindAssist:Previous", this);
  },

  receiveMessage: function findHandlerReceiveMessage(aMessage) {
    let findResult = Ci.nsITypeAheadFind.FIND_NOTFOUND;
    let json = aMessage.json;
    switch (aMessage.name) {
      case "FindAssist:Find":
        findResult = this._fastFind.find(json.searchString, false);
        break;

      case "FindAssist:Previous":
        findResult = this._fastFind.findAgain(true, false);
        break;

      case "FindAssist:Next":
        findResult = this._fastFind.findAgain(false, false);
        break;
    }

    if (findResult == Ci.nsITypeAheadFind.FIND_NOTFOUND) {
      sendAsyncMessage("FindAssist:Show", { rect: null , result: findResult });
      return;
    }

    if (!this._fastFind.currentWindow)
      return;

    let selection = this._fastFind.currentWindow.getSelection();
    if (!selection.rangeCount || selection.isCollapsed) {
      // The selection can be into an input or a textarea element
      let nodes = content.document.querySelectorAll("input[type='text'], textarea");
      for (let i = 0; i < nodes.length; i++) {
        let node = nodes[i];
        if (node instanceof Ci.nsIDOMNSEditableElement && node.editor) {
          selection = node.editor.selectionController.getSelection(Ci.nsISelectionController.SELECTION_NORMAL);
          if (selection.rangeCount && !selection.isCollapsed)
            break;
        }
      }
    }

    let scroll = ContentScroll.getScrollOffset(content);
    for (let frame = this._fastFind.currentWindow; frame != content; frame = frame.parent) {
      let rect = frame.frameElement.getBoundingClientRect();
      let left = frame.getComputedStyle(frame.frameElement, "").borderLeftWidth;
      let top = frame.getComputedStyle(frame.frameElement, "").borderTopWidth;
      scroll.add(rect.left + parseInt(left), rect.top + parseInt(top));
    }

    let rangeRect = selection.getRangeAt(0).getBoundingClientRect();
    let rect = new Rect(scroll.x + rangeRect.left, scroll.y + rangeRect.top, rangeRect.width, rangeRect.height);

    // Ensure the potential "scroll" event fired during a search as already fired
    let timer = new Util.Timeout(function() {
      sendAsyncMessage("FindAssist:Show", { rect: rect.isEmpty() ? null: rect , result: findResult });
    });
    timer.once(0);
  }
};

FindHandler.init();