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171 lines
4.9 KiB
JavaScript
171 lines
4.9 KiB
JavaScript
# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is Mozilla code.
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#
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# The Initial Developer of the Original Code is Mozilla Foundation
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# Portions created by the Initial Developer are Copyright (C) 2011
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the LGPL or the GPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK ***** -->
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let EXPORTED_SYMBOLS = ["PageMenu"];
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function PageMenu() {
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}
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PageMenu.prototype = {
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PAGEMENU_ATTR: "pagemenu",
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GENERATEDITEMID_ATTR: "generateditemid",
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popup: null,
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builder: null,
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maybeBuildAndAttachMenu: function(aTarget, aPopup) {
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var pageMenu = null;
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var target = aTarget;
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while (target) {
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var contextMenu = target.contextMenu;
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if (contextMenu) {
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pageMenu = contextMenu;
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break;
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}
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target = target.parentNode;
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}
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if (!pageMenu) {
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return false;
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}
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var insertionPoint = this.getInsertionPoint(aPopup);
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if (!insertionPoint) {
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return false;
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}
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pageMenu.QueryInterface(Components.interfaces.nsIHTMLMenu);
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pageMenu.sendShowEvent();
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// the show event is not cancelable, so no need to check a result here
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var fragment = aPopup.ownerDocument.createDocumentFragment();
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var builder = pageMenu.createBuilder();
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if (!builder) {
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return false;
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}
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builder.QueryInterface(Components.interfaces.nsIXULContextMenuBuilder);
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builder.init(fragment, this.GENERATEDITEMID_ATTR);
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pageMenu.build(builder);
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var pos = insertionPoint.getAttribute(this.PAGEMENU_ATTR);
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if (pos == "start") {
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insertionPoint.insertBefore(fragment,
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insertionPoint.firstChild);
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} else {
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insertionPoint.appendChild(fragment);
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}
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this.builder = builder;
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this.popup = aPopup;
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this.popup.addEventListener("command", this);
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this.popup.addEventListener("popuphidden", this);
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return true;
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},
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handleEvent: function(event) {
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var type = event.type;
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var target = event.target;
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if (type == "command" && target.hasAttribute(this.GENERATEDITEMID_ATTR)) {
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this.builder.click(target.getAttribute(this.GENERATEDITEMID_ATTR));
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} else if (type == "popuphidden" && this.popup == target) {
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this.removeGeneratedContent(this.popup);
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this.popup.removeEventListener("popuphidden", this);
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this.popup.removeEventListener("command", this);
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this.popup = null;
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this.builder = null;
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}
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},
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getImmediateChild: function(element, tag) {
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var child = element.firstChild;
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while (child) {
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if (child.localName == tag) {
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return child;
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}
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child = child.nextSibling;
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}
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return null;
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},
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getInsertionPoint: function(aPopup) {
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if (aPopup.hasAttribute(this.PAGEMENU_ATTR))
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return aPopup;
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var element = aPopup.firstChild;
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while (element) {
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if (element.localName == "menu") {
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var popup = this.getImmediateChild(element, "menupopup");
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if (popup) {
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var result = this.getInsertionPoint(popup);
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if (result) {
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return result;
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}
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}
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}
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element = element.nextSibling;
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}
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return null;
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},
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removeGeneratedContent: function(aPopup) {
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var ungenerated = [];
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ungenerated.push(aPopup);
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var count;
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while (0 != (count = ungenerated.length)) {
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var last = count - 1;
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var element = ungenerated[last];
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ungenerated.splice(last, 1);
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var i = element.childNodes.length;
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while (i-- > 0) {
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var child = element.childNodes[i];
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if (!child.hasAttribute(this.GENERATEDITEMID_ATTR)) {
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ungenerated.push(child);
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continue;
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}
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element.removeChild(child);
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}
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}
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}
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}
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