| /* |
| * Copyright (C) 2014, 2015 Apple Inc. All rights reserved. |
| * Copyright (C) 2013, 2014 University of Washington. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| // This class supports adding and removing many listeners at once. |
| // Add DOM or Inspector event listeners to the set using `register()`. |
| // Use `install()` and `uninstall()` to enable or disable all listeners |
| // in the set at once. |
| |
| WI.EventListenerSet = class EventListenerSet |
| { |
| constructor(defaultThisObject, name) |
| { |
| this.name = name; |
| this._defaultThisObject = defaultThisObject; |
| |
| this._listeners = []; |
| this._installed = false; |
| } |
| |
| // Public |
| |
| register(emitter, type, callback, thisObject, usesCapture) |
| { |
| console.assert(emitter, `Missing event emitter for event: ${type}.`); |
| console.assert(type, "Missing event type."); |
| console.assert(callback, `Missing callback for event: ${type}.`); |
| var emitterIsValid = emitter && (emitter instanceof WI.Object || emitter instanceof Node || (typeof emitter.addEventListener === "function")); |
| console.assert(emitterIsValid, "Event emitter ", emitter, ` (type: ${type}) is null or does not implement Node or WI.Object.`); |
| |
| if (!emitterIsValid || !type || !callback) |
| return; |
| |
| this._listeners.push({listener: new WI.EventListener(thisObject || this._defaultThisObject), emitter, type, callback, usesCapture}); |
| } |
| |
| unregister() |
| { |
| if (this._installed) |
| this.uninstall(); |
| this._listeners = []; |
| } |
| |
| install() |
| { |
| console.assert(!this._installed, "Already installed listener group: " + this.name); |
| if (this._installed) |
| return; |
| |
| this._installed = true; |
| |
| for (var data of this._listeners) |
| data.listener.connect(data.emitter, data.type, data.callback, data.usesCapture); |
| } |
| |
| uninstall(unregisterListeners) |
| { |
| console.assert(this._installed, "Trying to uninstall listener group " + this.name + ", but it isn't installed."); |
| if (!this._installed) |
| return; |
| |
| this._installed = false; |
| |
| for (var data of this._listeners) |
| data.listener.disconnect(); |
| |
| if (unregisterListeners) |
| this._listeners = []; |
| } |
| }; |