michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifdef XP_WIN
michael@0: #define USE_HITTEST
michael@0: #elifdef MOZ_WIDGET_COCOA
michael@0: #define USE_HITTEST
michael@0: #endif
michael@0: 
michael@0: this.EXPORTED_SYMBOLS = [ "WindowDraggingElement" ];
michael@0: 
michael@0: this.WindowDraggingElement = function WindowDraggingElement(elem) {
michael@0:   this._elem = elem;
michael@0:   this._window = elem.ownerDocument.defaultView;
michael@0: #ifdef USE_HITTEST
michael@0:   if (!this.isPanel())
michael@0:     this._elem.addEventListener("MozMouseHittest", this, false);
michael@0:   else
michael@0: #endif
michael@0:   this._elem.addEventListener("mousedown", this, false);
michael@0: };
michael@0: 
michael@0: WindowDraggingElement.prototype = {
michael@0:   mouseDownCheck: function(e) { return true; },
michael@0:   dragTags: ["box", "hbox", "vbox", "spacer", "label", "statusbarpanel", "stack",
michael@0:              "toolbaritem", "toolbarseparator", "toolbarspring", "toolbarspacer",
michael@0:              "radiogroup", "deck", "scrollbox", "arrowscrollbox", "tabs"],
michael@0:   shouldDrag: function(aEvent) {
michael@0:     if (aEvent.button != 0 ||
michael@0:         this._window.fullScreen ||
michael@0:         !this.mouseDownCheck.call(this._elem, aEvent) ||
michael@0:         aEvent.defaultPrevented)
michael@0:       return false;
michael@0: 
michael@0:     let target = aEvent.originalTarget, parent = aEvent.originalTarget;
michael@0: 
michael@0:     // The target may be inside an embedded iframe or browser. (bug 615152)
michael@0:     if (target.ownerDocument.defaultView != this._window)
michael@0:       return false;
michael@0: 
michael@0:     while (parent != this._elem) {
michael@0:       let mousethrough = parent.getAttribute("mousethrough");
michael@0:       if (mousethrough == "always")
michael@0:         target = parent.parentNode;
michael@0:       else if (mousethrough == "never")
michael@0:         break;
michael@0:       parent = parent.parentNode;
michael@0:     }
michael@0:     while (target != this._elem) {
michael@0:       if (this.dragTags.indexOf(target.localName) == -1)
michael@0:         return false;
michael@0:       target = target.parentNode;
michael@0:     }
michael@0:     return true;
michael@0:   },
michael@0:   isPanel : function() {
michael@0:     return this._elem instanceof Components.interfaces.nsIDOMXULElement &&
michael@0:            this._elem.localName == "panel";
michael@0:   },
michael@0:   handleEvent: function(aEvent) {
michael@0:     let isPanel = this.isPanel();
michael@0: #ifdef USE_HITTEST
michael@0:     if (!isPanel) {
michael@0:       if (this.shouldDrag(aEvent))
michael@0:         aEvent.preventDefault();
michael@0:       return;
michael@0:     }
michael@0: #endif
michael@0: 
michael@0:     switch (aEvent.type) {
michael@0:       case "mousedown":
michael@0:         if (!this.shouldDrag(aEvent))
michael@0:           return;
michael@0: 
michael@0: #ifdef MOZ_WIDGET_GTK
michael@0:         // On GTK, there is a toolkit-level function which handles
michael@0:         // window dragging, which must be used.
michael@0:         this._window.beginWindowMove(aEvent, isPanel ? this._elem : null);
michael@0: #else
michael@0:         if (isPanel) {
michael@0:           let screenRect = this._elem.getOuterScreenRect();
michael@0:           this._deltaX = aEvent.screenX - screenRect.left;
michael@0:           this._deltaY = aEvent.screenY - screenRect.top;
michael@0:         }
michael@0:         else {
michael@0:           this._deltaX = aEvent.screenX - this._window.screenX;
michael@0:           this._deltaY = aEvent.screenY - this._window.screenY;
michael@0:         }
michael@0:         this._draggingWindow = true;
michael@0:         this._window.addEventListener("mousemove", this, false);
michael@0:         this._window.addEventListener("mouseup", this, false);
michael@0: #endif
michael@0:         break;
michael@0:       case "mousemove":
michael@0:         if (this._draggingWindow) {
michael@0:           let toDrag = this.isPanel() ? this._elem : this._window;
michael@0:           toDrag.moveTo(aEvent.screenX - this._deltaX, aEvent.screenY - this._deltaY);
michael@0:         }
michael@0:         break;
michael@0:       case "mouseup":
michael@0:         if (this._draggingWindow) {
michael@0:           this._draggingWindow = false;
michael@0:           this._window.removeEventListener("mousemove", this, false);
michael@0:           this._window.removeEventListener("mouseup", this, false);
michael@0:         }
michael@0:         break;
michael@0:     }
michael@0:   }
michael@0: }