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