gecko-dev/toolkit/modules/PageMenu.jsm

140 строки
3.5 KiB
JavaScript

/* 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/. */
this.EXPORTED_SYMBOLS = ["PageMenu"];
this.PageMenu = function PageMenu() {
}
PageMenu.prototype = {
PAGEMENU_ATTR: "pagemenu",
GENERATEDITEMID_ATTR: "generateditemid",
popup: null,
builder: null,
maybeBuildAndAttachMenu: function(aTarget, aPopup) {
var pageMenu = null;
var target = aTarget;
while (target) {
var contextMenu = target.contextMenu;
if (contextMenu) {
pageMenu = contextMenu;
break;
}
target = target.parentNode;
}
if (!pageMenu) {
return false;
}
var insertionPoint = this.getInsertionPoint(aPopup);
if (!insertionPoint) {
return false;
}
pageMenu.QueryInterface(Components.interfaces.nsIHTMLMenu);
pageMenu.sendShowEvent();
// the show event is not cancelable, so no need to check a result here
var fragment = aPopup.ownerDocument.createDocumentFragment();
var builder = pageMenu.createBuilder();
if (!builder) {
return false;
}
builder.QueryInterface(Components.interfaces.nsIXULContextMenuBuilder);
builder.init(fragment, this.GENERATEDITEMID_ATTR);
pageMenu.build(builder);
var pos = insertionPoint.getAttribute(this.PAGEMENU_ATTR);
if (pos == "start") {
insertionPoint.insertBefore(fragment,
insertionPoint.firstChild);
} else {
insertionPoint.appendChild(fragment);
}
this.builder = builder;
this.popup = aPopup;
this.popup.addEventListener("command", this);
this.popup.addEventListener("popuphidden", this);
return true;
},
handleEvent: function(event) {
var type = event.type;
var target = event.target;
if (type == "command" && target.hasAttribute(this.GENERATEDITEMID_ATTR)) {
this.builder.click(target.getAttribute(this.GENERATEDITEMID_ATTR));
} else if (type == "popuphidden" && this.popup == target) {
this.removeGeneratedContent(this.popup);
this.popup.removeEventListener("popuphidden", this);
this.popup.removeEventListener("command", this);
this.popup = null;
this.builder = null;
}
},
getImmediateChild: function(element, tag) {
var child = element.firstChild;
while (child) {
if (child.localName == tag) {
return child;
}
child = child.nextSibling;
}
return null;
},
getInsertionPoint: function(aPopup) {
if (aPopup.hasAttribute(this.PAGEMENU_ATTR))
return aPopup;
var element = aPopup.firstChild;
while (element) {
if (element.localName == "menu") {
var popup = this.getImmediateChild(element, "menupopup");
if (popup) {
var result = this.getInsertionPoint(popup);
if (result) {
return result;
}
}
}
element = element.nextSibling;
}
return null;
},
removeGeneratedContent: function(aPopup) {
var ungenerated = [];
ungenerated.push(aPopup);
var count;
while (0 != (count = ungenerated.length)) {
var last = count - 1;
var element = ungenerated[last];
ungenerated.splice(last, 1);
var i = element.childNodes.length;
while (i-- > 0) {
var child = element.childNodes[i];
if (!child.hasAttribute(this.GENERATEDITEMID_ATTR)) {
ungenerated.push(child);
continue;
}
element.removeChild(child);
}
}
}
}