116 lines
2.8 KiB
JavaScript
116 lines
2.8 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var {utils: Cu} = Components;
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Cu.import("resource://gre/modules/Services.jsm");
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this.EXPORTED_SYMBOLS = ["modal"];
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var isFirefox = () => Services.appinfo.name == "Firefox";
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this.modal = {};
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modal = {
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COMMON_DIALOG_LOADED: "common-dialog-loaded",
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TABMODAL_DIALOG_LOADED: "tabmodal-dialog-loaded",
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handlers: {
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"common-dialog-loaded": new Set(),
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"tabmodal-dialog-loaded": new Set()
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}
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};
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/**
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* Add handler that will be called when a global- or tab modal dialogue
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* appears.
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*
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* This is achieved by installing observers for common-
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* and tab modal loaded events.
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*
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* This function is a no-op if called on any other product than Firefox.
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*
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* @param {function(Object, string)} handler
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* The handler to be called, which is passed the
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* subject (e.g. ChromeWindow) and the topic (one of
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* {@code modal.COMMON_DIALOG_LOADED} or
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* {@code modal.TABMODAL_DIALOG_LOADED}.
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*/
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modal.addHandler = function(handler) {
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if (!isFirefox()) {
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return;
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}
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Object.keys(this.handlers).map(topic => {
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this.handlers[topic].add(handler);
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Services.obs.addObserver(handler, topic, false);
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});
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};
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/**
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* Remove modal dialogue handler by function reference.
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*
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* This function is a no-op if called on any other product than Firefox.
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*
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* @param {function} toRemove
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* The handler previously passed to modal.addHandler which will now
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* be removed.
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*/
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modal.removeHandler = function(toRemove) {
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if (!isFirefox()) {
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return;
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}
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for (let topic of Object.keys(this.handlers)) {
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let handlers = this.handlers[topic];
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for (let handler of handlers) {
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if (handler == toRemove) {
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Services.obs.removeObserver(handler, topic);
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handlers.delete(handler);
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}
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}
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}
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};
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/**
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* Represents the current modal dialogue.
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*
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* @param {function(): BrowserObj} curBrowserFn
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* Function that returns the current BrowserObj.
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* @param {?nsIWeakReference} winRef
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* A weak reference to the current ChromeWindow.
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*/
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modal.Dialog = function(curBrowserFn, winRef=null) {
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Object.defineProperty(this, "curBrowser", {
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get() { return curBrowserFn(); }
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});
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this.win_ = winRef;
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};
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/**
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* Returns the ChromeWindow associated with an open dialog window if it
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* is currently attached to the DOM.
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*/
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Object.defineProperty(modal.Dialog.prototype, "window", {
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get() {
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if (this.win_ !== null) {
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let win = this.win_.get();
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if (win && win.parent) {
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return win;
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}
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}
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return null;
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}
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});
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Object.defineProperty(modal.Dialog.prototype, "ui", {
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get() {
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let win = this.window;
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if (win) {
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return win.Dialog.ui;
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}
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return this.curBrowser.getTabModalUI();
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}
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});
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