gecko-dev/toolkit/modules/SelectParentHelper.jsm

99 строки
2.9 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";
this.EXPORTED_SYMBOLS = [
"SelectParentHelper"
];
let currentBrowser = null;
this.SelectParentHelper = {
populate: function(menulist, items, selectedIndex) {
// Clear the current contents of the popup
menulist.menupopup.textContent = "";
populateChildren(menulist.menupopup, items, selectedIndex);
// We expect the parent element of the popup to be a <xul:menulist> that
// has the popuponly attribute set to "true". This is necessary in order
// for a <xul:menupopup> to act like a proper <html:select> dropdown, as
// the <xul:menulist> does things like remember state and set the
// _moz-menuactive attribute on the selected <xul:menuitem>.
menulist.selectedIndex = selectedIndex;
},
open: function(browser, menulist, rect) {
menulist.hidden = false;
currentBrowser = browser;
this._registerListeners(menulist.menupopup);
let {x, y} = browser.mapScreenCoordinatesFromContent(rect.left, rect.top + rect.height);
menulist.menupopup.openPopupAtScreen(x, y);
menulist.selectedItem.scrollIntoView();
},
hide: function(menulist) {
menulist.menupopup.hidePopup();
},
handleEvent: function(event) {
let popup = event.currentTarget;
let menulist = popup.parentNode;
switch (event.type) {
case "command":
if (event.target.hasAttribute("value")) {
currentBrowser.messageManager.sendAsyncMessage("Forms:SelectDropDownItem", {
value: event.target.value
});
}
popup.hidePopup();
break;
case "popuphidden":
currentBrowser.messageManager.sendAsyncMessage("Forms:DismissedDropDown", {});
currentBrowser = null;
this._unregisterListeners(popup);
menulist.hidden = true;
break;
}
},
_registerListeners: function(popup) {
popup.addEventListener("command", this);
popup.addEventListener("popuphidden", this);
},
_unregisterListeners: function(popup) {
popup.removeEventListener("command", this);
popup.removeEventListener("popuphidden", this);
},
};
function populateChildren(element, options, selectedIndex, startIndex = 0, isGroup = false) {
let index = startIndex;
for (let option of options) {
let item = element.ownerDocument.createElement("menuitem");
item.setAttribute("label", option.textContent);
element.appendChild(item);
if (option.children.length > 0) {
item.classList.add("contentSelectDropdown-optgroup");
item.setAttribute("disabled", "true");
index = populateChildren(element, option.children, selectedIndex, index, true);
} else {
item.setAttribute("value", index++);
if (isGroup) {
item.classList.add("contentSelectDropdown-ingroup")
}
}
}
return index;
}