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/* 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/. */
Components.utils.import("resource://gre/modules/AppConstants.jsm");
const HAVE_CSS_WINDOW_DRAG_SUPPORT = ["win", "macosx"].includes(AppConstants.platform);
this.EXPORTED_SYMBOLS = [ "WindowDraggingElement" ];
this.WindowDraggingElement = function WindowDraggingElement(elem) {
this._elem = elem;
this._window = elem.ownerDocument.defaultView;
if (HAVE_CSS_WINDOW_DRAG_SUPPORT && !this.isPanel()) {
return;
}
this._elem.addEventListener("mousedown", this, false);
};
WindowDraggingElement.prototype = {
mouseDownCheck: function(e) { return true; },
dragTags: ["box", "hbox", "vbox", "spacer", "label", "statusbarpanel", "stack",
"toolbaritem", "toolbarseparator", "toolbarspring", "toolbarspacer",
"radiogroup", "deck", "scrollbox", "arrowscrollbox", "tabs"],
shouldDrag: function(aEvent) {
if (aEvent.button != 0 ||
this._window.fullScreen ||
!this.mouseDownCheck.call(this._elem, aEvent) ||
aEvent.defaultPrevented)
return false;
let target = aEvent.originalTarget, parent = aEvent.originalTarget;
// The target may be inside an embedded iframe or browser. (bug 615152)
if (target.ownerDocument.defaultView != this._window)
return false;
while (parent != this._elem) {
let mousethrough = parent.getAttribute("mousethrough");
if (mousethrough == "always")
target = parent.parentNode;
else if (mousethrough == "never")
break;
parent = parent.parentNode;
}
while (target != this._elem) {
if (this.dragTags.indexOf(target.localName) == -1)
return false;
target = target.parentNode;
}
return true;
},
isPanel : function() {
return this._elem instanceof Components.interfaces.nsIDOMXULElement &&
this._elem.localName == "panel";
},
handleEvent: function(aEvent) {
let isPanel = this.isPanel();
switch (aEvent.type) {
case "mousedown":
if (!this.shouldDrag(aEvent))
return;
if (/^gtk/i.test(AppConstants.MOZ_WIDGET_TOOLKIT)) {
// On GTK, there is a toolkit-level function which handles
// window dragging, which must be used.
this._window.beginWindowMove(aEvent, isPanel ? this._elem : null);
break;
}
if (isPanel) {
let screenRect = this._elem.getOuterScreenRect();
this._deltaX = aEvent.screenX - screenRect.left;
this._deltaY = aEvent.screenY - screenRect.top;
}
else {
this._deltaX = aEvent.screenX - this._window.screenX;
this._deltaY = aEvent.screenY - this._window.screenY;
}
this._draggingWindow = true;
this._window.addEventListener("mousemove", this, false);
this._window.addEventListener("mouseup", this, false);
break;
case "mousemove":
if (this._draggingWindow) {
let toDrag = this.isPanel() ? this._elem : this._window;
toDrag.moveTo(aEvent.screenX - this._deltaX, aEvent.screenY - this._deltaY);
}
break;
case "mouseup":
if (this._draggingWindow) {
this._draggingWindow = false;
this._window.removeEventListener("mousemove", this, false);
this._window.removeEventListener("mouseup", this, false);
}
break;
}
}
}
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