//
// System.Windows.Browser.HtmlObject class
//
// Contact:
// Moonlight List (moonlight-list@lists.ximian.com)
//
// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using Mono;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Windows.Interop;
namespace System.Windows.Browser{
public abstract class HtmlObject : ScriptObject {
private Dictionary<string, Dictionary<object,DOMEventListener>> events;
protected HtmlObject ()
{
}
internal HtmlObject (IntPtr handle, bool handleIsScriptableNPObject)
: base (handle, handleIsScriptableNPObject)
{
}
internal static void CheckEvent (string eventName, EventHandler handler, EventHandler<HtmlEventArgs> handler_args)
{
if (eventName == null)
throw new ArgumentNullException ("eventName");
if ((eventName.Length == 0) || (eventName.IndexOf ('\0') != -1))
throw new ArgumentException ("eventName");
if ((handler == null) && (handler_args == null))
throw new ArgumentNullException ("handler");
}
public bool AttachEvent (string eventName, EventHandler handler)
{
CheckEvent (eventName, handler, null);
DOMEventListener listener = new DOMEventListener (this, eventName, handler);
listener.AttachEvent();
return AddListener (handler, listener);
}
public bool AttachEvent (string eventName, EventHandler<HtmlEventArgs> handler)
{
CheckEvent (eventName, null, handler);
DOMEventListener listener = new DOMEventListener (this, eventName, handler);
listener.AttachEvent();
return AddListener (handler, listener);
}
private bool AddListener (object handler, DOMEventListener listener)
{
Dictionary<object,DOMEventListener> listeners;
if (listener == null)
return false;
if (events == null)
events = new Dictionary<string, Dictionary<object,DOMEventListener>> ();
if (!events.TryGetValue (listener.EventName, out listeners)) {
listeners = new Dictionary<object,DOMEventListener> ();
events.Add (listener.EventName, listeners);
}
listeners[handler] = listener;
return true;
}
public void DetachEvent (string eventName, EventHandler handler)
{
CheckEvent (eventName, handler, null);
DetachListener (eventName, handler);
}
public void DetachEvent (string eventName, EventHandler<HtmlEventArgs> handler)
{
CheckEvent (eventName, null, handler);
DetachListener (eventName, handler);
}
private void DetachListener (string eventName, object handler)
{
Dictionary<object,DOMEventListener> listeners;
if (events == null)
return;
if (!events.TryGetValue (eventName, out listeners))
return;
DOMEventListener listener;
if (!listeners.TryGetValue (handler, out listener))
return;
listener.DetachEvent();
listeners.Remove (handler);
}
protected override object ConvertTo (Type targetType, bool allowSerialization)
{
// documented as "not supported" in SL2 and to throw a ArgumentException "in all cases"
// not quite true since a null targetType throws a NRE but otherwise seems correct
throw new ArgumentException (targetType.ToString ());
}
private class DOMEventListener {
public DOMEventListener (HtmlObject obj, string name, EventHandler<HtmlEventArgs> handler_args) : this (obj, name)
{
this.handler_args = handler_args;
}
public DOMEventListener (HtmlObject obj, string name, EventHandler handler) : this (obj, name)
{
this.handler = handler;
}
public DOMEventListener (HtmlObject obj, string name)
{
this.obj = obj;
this.name = name;
}
[ScriptableMember (ScriptAlias = "handleEvent")]
public void HandleEvent (ScriptObject eventObject)
{
try {
if (handler != null) {
handler (obj, EventArgs.Empty);
} else if (handler_args != null) {
handler_args (obj, eventObject == null ? null : new HtmlEventArgs (obj, eventObject));
}
} catch (Exception ex) {
Console.WriteLine ("Unhandled exception in DOMEventListener.HandleEvent: {0}", ex.Message);
//Console.WriteLine (ex);
}
}
public string EventName {
get { return name; }
}
private string EventNameMozilla {
get {
if (name.StartsWith ("on"))
return name.Substring (2);
return name;
}
}
public void AttachEvent ()
{
obj.Invoke ("addEventListener", new object[] { EventNameMozilla, this, false });
}
public void DetachEvent ()
{
obj.Invoke ("removeEventListener", new object[] { EventNameMozilla, this, false });
}
private HtmlObject obj;
private string name;
private EventHandler handler;
private EventHandler<HtmlEventArgs> handler_args;
}
}
}
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