gecko-dev/toolkit/modules/SelectContentHelper.jsm

129 строки
3.8 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/. */
"use strict";
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
"resource://gre/modules/BrowserUtils.jsm");
this.EXPORTED_SYMBOLS = [
"SelectContentHelper"
];
this.SelectContentHelper = function (aElement, aGlobal) {
this.element = aElement;
this.initialSelection = aElement[aElement.selectedIndex] || null;
this.global = aGlobal;
this.init();
this.showDropDown();
}
this.SelectContentHelper.prototype = {
init: function() {
this.global.addMessageListener("Forms:SelectDropDownItem", this);
this.global.addMessageListener("Forms:DismissedDropDown", this);
this.global.addEventListener("pagehide", this);
},
uninit: function() {
this.global.removeMessageListener("Forms:SelectDropDownItem", this);
this.global.removeMessageListener("Forms:DismissedDropDown", this);
this.global.removeEventListener("pagehide", this);
this.element = null;
this.global = null;
},
showDropDown: function() {
let rect = this._getBoundingContentRect();
this.global.sendAsyncMessage("Forms:ShowDropDown", {
rect: rect,
options: this._buildOptionList(),
selectedIndex: this.element.selectedIndex
});
},
_getBoundingContentRect: function() {
return BrowserUtils.getElementBoundingScreenRect(this.element);
},
_buildOptionList: function() {
return buildOptionListForChildren(this.element);
},
receiveMessage: function(message) {
switch (message.name) {
case "Forms:SelectDropDownItem":
this.element.selectedIndex = message.data.value;
break;
case "Forms:DismissedDropDown":
if (this.initialSelection != this.element.item[this.element.selectedIndex]) {
let event = this.element.ownerDocument.createEvent("Events");
event.initEvent("change", true, true);
this.element.dispatchEvent(event);
}
this.uninit();
break;
}
},
handleEvent: function(event) {
switch (event.type) {
case "pagehide":
this.global.sendAsyncMessage("Forms:HideDropDown", {});
this.uninit();
break;
}
}
}
function buildOptionListForChildren(node) {
let result = [];
let win = node.ownerDocument.defaultView;
for (let child of node.children) {
let tagName = child.tagName.toUpperCase();
if (tagName == 'OPTION' || tagName == 'OPTGROUP') {
let textContent =
tagName == 'OPTGROUP' ? child.getAttribute("label")
: child.textContent;
if (textContent != null) {
textContent = textContent.trim();
} else {
textContent = ""
}
let info = {
tagName: child.tagName,
textContent: textContent,
disabled: child.disabled,
// We need to do this for every option element as each one can have
// an individual style set for direction
textDirection: win.getComputedStyle(child).getPropertyValue("direction"),
// XXX this uses a highlight color when this is the selected element.
// We need to suppress such highlighting in the content process to get
// the option's correct unhighlighted color here.
// We also need to detect default color vs. custom so that a standard
// color does not override color: menutext in the parent.
// backgroundColor: computedStyle.backgroundColor,
// color: computedStyle.color,
children: tagName == 'OPTGROUP' ? buildOptionListForChildren(child) : []
};
result.push(info);
}
}
return result;
}