зеркало из https://github.com/mozilla/gecko-dev.git
122 строки
4.0 KiB
JavaScript
122 строки
4.0 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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this.EXPORTED_SYMBOLS = [
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"SelectParentHelper"
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];
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let currentBrowser = null;
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this.SelectParentHelper = {
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populate: function(menulist, items, selectedIndex, zoom) {
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// Clear the current contents of the popup
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menulist.menupopup.textContent = "";
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populateChildren(menulist, items, selectedIndex, zoom);
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},
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open: function(browser, menulist, rect) {
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menulist.hidden = false;
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currentBrowser = browser;
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this._registerListeners(menulist.menupopup);
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menulist.menupopup.openPopupAtScreenRect("after_start", rect.left, rect.top, rect.width, rect.height, false, false);
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menulist.selectedItem.scrollIntoView();
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},
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hide: function(menulist) {
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menulist.menupopup.hidePopup();
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},
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handleEvent: function(event) {
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switch (event.type) {
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case "command":
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if (event.target.hasAttribute("value")) {
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currentBrowser.messageManager.sendAsyncMessage("Forms:SelectDropDownItem", {
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value: event.target.value
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});
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}
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break;
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case "popuphidden":
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currentBrowser.messageManager.sendAsyncMessage("Forms:DismissedDropDown", {});
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currentBrowser = null;
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let popup = event.target;
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this._unregisterListeners(popup);
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popup.parentNode.hidden = true;
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break;
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}
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},
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_registerListeners: function(popup) {
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popup.addEventListener("command", this);
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popup.addEventListener("popuphidden", this);
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},
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_unregisterListeners: function(popup) {
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popup.removeEventListener("command", this);
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popup.removeEventListener("popuphidden", this);
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},
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};
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function populateChildren(menulist, options, selectedIndex, zoom, startIndex = 0,
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isInGroup = false, isGroupDisabled = false, adjustedTextSize = -1) {
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let index = startIndex;
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let element = menulist.menupopup;
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// -1 just means we haven't calculated it yet. When we recurse through this function
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// we will pass in adjustedTextSize to save on recalculations.
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if (adjustedTextSize == -1) {
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let win = element.ownerDocument.defaultView;
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// Grab the computed text size and multiply it by the remote browser's fullZoom to ensure
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// the popup's text size is matched with the content's. We can't just apply a CSS transform
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// here as the popup's preferred size is calculated pre-transform.
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let textSize = win.getComputedStyle(element).getPropertyValue("font-size");
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adjustedTextSize = (zoom * parseFloat(textSize, 10)) + "px";
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}
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for (let option of options) {
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let isOptGroup = (option.tagName == 'OPTGROUP');
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let item = element.ownerDocument.createElement(isOptGroup ? "menucaption" : "menuitem");
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item.setAttribute("label", option.textContent);
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item.style.direction = option.textDirection;
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item.style.fontSize = adjustedTextSize;
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item.setAttribute("tooltiptext", option.tooltip);
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element.appendChild(item);
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// A disabled optgroup disables all of its child options.
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let isDisabled = isGroupDisabled || option.disabled;
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if (isDisabled) {
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item.setAttribute("disabled", "true");
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}
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if (isOptGroup) {
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index = populateChildren(menulist, option.children, selectedIndex, zoom,
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index, true, isDisabled, adjustedTextSize);
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} else {
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if (index == selectedIndex) {
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// We expect the parent element of the popup to be a <xul:menulist> that
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// has the popuponly attribute set to "true". This is necessary in order
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// for a <xul:menupopup> to act like a proper <html:select> dropdown, as
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// the <xul:menulist> does things like remember state and set the
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// _moz-menuactive attribute on the selected <xul:menuitem>.
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menulist.selectedItem = item;
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}
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item.setAttribute("value", index++);
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if (isInGroup) {
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item.classList.add("contentSelectDropdown-ingroup")
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}
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}
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}
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return index;
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}
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