зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
3.5 KiB
JavaScript
120 строки
3.5 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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"use strict";
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
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"resource://gre/modules/BrowserUtils.jsm");
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this.EXPORTED_SYMBOLS = [
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"SelectContentHelper"
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];
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this.SelectContentHelper = function (aElement, aGlobal) {
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this.element = aElement;
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this.global = aGlobal;
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this.init();
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this.showDropDown();
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}
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this.SelectContentHelper.prototype = {
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init: function() {
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this.global.addMessageListener("Forms:SelectDropDownItem", this);
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this.global.addMessageListener("Forms:DismissedDropDown", this);
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this.global.addEventListener("pagehide", this);
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},
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uninit: function() {
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this.global.removeMessageListener("Forms:SelectDropDownItem", this);
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this.global.removeMessageListener("Forms:DismissedDropDown", this);
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this.global.removeEventListener("pagehide", this);
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this.element = null;
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this.global = null;
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},
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showDropDown: function() {
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let rect = this._getBoundingContentRect();
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this.global.sendAsyncMessage("Forms:ShowDropDown", {
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rect: rect,
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options: this._buildOptionList(),
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selectedIndex: this.element.selectedIndex,
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});
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},
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_getBoundingContentRect: function() {
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return BrowserUtils.getElementBoundingScreenRect(this.element);
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},
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_buildOptionList: function() {
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return buildOptionListForChildren(this.element);
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},
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receiveMessage: function(message) {
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switch (message.name) {
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case "Forms:SelectDropDownItem":
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if (this.element.selectedIndex != message.data.value) {
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this.element.selectedIndex = message.data.value;
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let event = this.element.ownerDocument.createEvent("Events");
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event.initEvent("change", true, true);
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this.element.dispatchEvent(event);
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}
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//intentional fall-through
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case "Forms:DismissedDropDown":
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this.uninit();
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break;
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}
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},
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handleEvent: function(event) {
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switch (event.type) {
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case "pagehide":
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this.global.sendAsyncMessage("Forms:HideDropDown", {});
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this.uninit();
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break;
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}
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}
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}
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function buildOptionListForChildren(node) {
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let result = [];
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for (let child = node.firstChild; child; child = child.nextSibling) {
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if (child.tagName == 'OPTION' || child.tagName == 'OPTGROUP') {
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let textContent =
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child.tagName == 'OPTGROUP' ? child.getAttribute("label")
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: child.textContent;
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if (textContent != null) {
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textContent = textContent.trim();
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} else {
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textContent = ""
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}
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let info = {
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tagName: child.tagName,
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textContent: textContent,
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// XXX this uses a highlight color when this is the selected element.
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// We need to suppress such highlighting in the content process to get
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// the option's correct unhighlighted color here.
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// We also need to detect default color vs. custom so that a standard
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// color does not override color: menutext in the parent.
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// backgroundColor: computedStyle.backgroundColor,
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// color: computedStyle.color,
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children: child.tagName == 'OPTGROUP' ? buildOptionListForChildren(child) : []
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};
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result.push(info);
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}
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}
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return result;
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}
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