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windowDraggingUtils.js (4488B)

      1 /* ***** BEGIN LICENSE BLOCK *****
      2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
      3  *
      4  * The contents of this file are subject to the Mozilla Public License Version
      5  * 1.1 (the "License"); you may not use this file except in compliance with
      6  * the License. You may obtain a copy of the License at
      7  * http://www.mozilla.org/MPL/
      8  *
      9  * Software distributed under the License is distributed on an "AS IS" basis,
     10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     11  * for the specific language governing rights and limitations under the
     12  * License.
     13  *
     14  * The Original Code is mozilla.org Code.
     15  *
     16  * The Initial Developer of the Original Code is
     17  * Markus Stange <mstange@themasta.com>.
     18  * Portions created by the Initial Developer are Copyright (C) 2008
     19  * the Initial Developer. All Rights Reserved.
     20  *
     21  * Contributor(s):
     22  *
     23  * Alternatively, the contents of this file may be used under the terms of
     24  * either the GNU General Public License Version 2 or later (the "GPL"), or
     25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
     26  * in which case the provisions of the GPL or the LGPL are applicable instead
     27  * of those above. If you wish to allow use of your version of this file only
     28  * under the terms of either the GPL or the LGPL, and not to allow others to
     29  * use your version of this file under the terms of the MPL, indicate your
     30  * decision by deleting the provisions above and replace them with the notice
     31  * and other provisions required by the GPL or the LGPL. If you do not delete
     32  * the provisions above, a recipient may use your version of this file under
     33  * the terms of any one of the MPL, the GPL or the LGPL.
     34  *
     35  * ***** END LICENSE BLOCK ***** */
     36 
     37 let EXPORTED_SYMBOLS = [ "WindowDraggingElement" ];
     38 
     39 function WindowDraggingElement(elem, window) {
     40   this._elem = elem;
     41   this._window = window;
     42   this._elem.addEventListener("mousedown", this, false);
     43 }
     44 
     45 WindowDraggingElement.prototype = {
     46   mouseDownCheck: function(e) { return true; },
     47   dragTags: ["box", "hbox", "vbox", "spacer", "label", "statusbarpanel", "stack",
     48              "toolbaritem", "toolbarseparator", "toolbarspring", "toolbarspacer",
     49              "radiogroup", "deck", "scrollbox", "arrowscrollbox", "tabs"],
     50   shouldDrag: function(aEvent) {
     51     if (aEvent.button != 0 ||
     52         this._window.fullScreen ||
     53         !this.mouseDownCheck.call(this._elem, aEvent) ||
     54         aEvent.defaultPrevented)
     55       return false;
     56 
     57     let target = aEvent.originalTarget, parent = aEvent.originalTarget;
     58 
     59     // The target may be inside an embedded iframe or browser. (bug 615152)
     60     if (target.ownerDocument.defaultView != this._window)
     61       return false;
     62 
     63     while (parent != this._elem) {
     64       let mousethrough = parent.getAttribute("mousethrough");
     65       if (mousethrough == "always")
     66         target = parent.parentNode;
     67       else if (mousethrough == "never")
     68         break;
     69       parent = parent.parentNode;
     70     }
     71     while (target != this._elem) {
     72       if (this.dragTags.indexOf(target.localName) == -1)
     73         return false;
     74       target = target.parentNode;
     75     }
     76     return true;
     77   },
     78   isPanel : function() {
     79     return this._elem instanceof Components.interfaces.nsIDOMXULElement &&
     80            this._elem.localName == "panel";
     81   },
     82   handleEvent: function(aEvent) {
     83     let isPanel = this.isPanel();
     84 
     85     switch (aEvent.type) {
     86       case "mousedown":
     87         if (!this.shouldDrag(aEvent))
     88           return;
     89 
     90         if (isPanel) {
     91           let screenRect = this._elem.getOuterScreenRect();
     92           this._deltaX = aEvent.screenX - screenRect.left;
     93           this._deltaY = aEvent.screenY - screenRect.top;
     94         }
     95         else {
     96           this._deltaX = aEvent.screenX - this._window.screenX;
     97           this._deltaY = aEvent.screenY - this._window.screenY;
     98         }
     99         this._draggingWindow = true;
    100         this._window.addEventListener("mousemove", this, false);
    101         this._window.addEventListener("mouseup", this, false);
    102         break;
    103       case "mousemove":
    104         if (this._draggingWindow) {
    105           let toDrag = this.isPanel() ? this._elem : this._window;
    106           toDrag.moveTo(aEvent.screenX - this._deltaX, aEvent.screenY - this._deltaY);
    107         }
    108         break;
    109       case "mouseup":
    110         if (this._draggingWindow) {
    111           this._draggingWindow = false;
    112           this._window.removeEventListener("mousemove", this, false);
    113           this._window.removeEventListener("mouseup", this, false);
    114         }
    115         break;
    116     }
    117   }
    118 }