gecko-dev/toolkit/modules/SelectParentHelper.jsm

122 строки
4.0 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, zoom) {
// Clear the current contents of the popup
menulist.menupopup.textContent = "";
populateChildren(menulist, items, selectedIndex, zoom);
},
open: function(browser, menulist, rect) {
menulist.hidden = false;
currentBrowser = browser;
this._registerListeners(menulist.menupopup);
menulist.menupopup.openPopupAtScreenRect("after_start", rect.left, rect.top, rect.width, rect.height, false, false);
menulist.selectedItem.scrollIntoView();
},
hide: function(menulist) {
menulist.menupopup.hidePopup();
},
handleEvent: function(event) {
switch (event.type) {
case "command":
if (event.target.hasAttribute("value")) {
currentBrowser.messageManager.sendAsyncMessage("Forms:SelectDropDownItem", {
value: event.target.value
});
}
break;
case "popuphidden":
currentBrowser.messageManager.sendAsyncMessage("Forms:DismissedDropDown", {});
currentBrowser = null;
let popup = event.target;
this._unregisterListeners(popup);
popup.parentNode.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(menulist, options, selectedIndex, zoom, startIndex = 0,
isInGroup = false, isGroupDisabled = false, adjustedTextSize = -1) {
let index = startIndex;
let element = menulist.menupopup;
// -1 just means we haven't calculated it yet. When we recurse through this function
// we will pass in adjustedTextSize to save on recalculations.
if (adjustedTextSize == -1) {
let win = element.ownerDocument.defaultView;
// Grab the computed text size and multiply it by the remote browser's fullZoom to ensure
// the popup's text size is matched with the content's. We can't just apply a CSS transform
// here as the popup's preferred size is calculated pre-transform.
let textSize = win.getComputedStyle(element).getPropertyValue("font-size");
adjustedTextSize = (zoom * parseFloat(textSize, 10)) + "px";
}
for (let option of options) {
let isOptGroup = (option.tagName == 'OPTGROUP');
let item = element.ownerDocument.createElement(isOptGroup ? "menucaption" : "menuitem");
item.setAttribute("label", option.textContent);
item.style.direction = option.textDirection;
item.style.fontSize = adjustedTextSize;
item.setAttribute("tooltiptext", option.tooltip);
element.appendChild(item);
// A disabled optgroup disables all of its child options.
let isDisabled = isGroupDisabled || option.disabled;
if (isDisabled) {
item.setAttribute("disabled", "true");
}
if (isOptGroup) {
index = populateChildren(menulist, option.children, selectedIndex, zoom,
index, true, isDisabled, adjustedTextSize);
} else {
if (index == 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.selectedItem = item;
}
item.setAttribute("value", index++);
if (isInGroup) {
item.classList.add("contentSelectDropdown-ingroup")
}
}
}
return index;
}