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//
// System.ComponentModel.Component.cs
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (C) Ximian, Inc. http://www.ximian.com
// (C) 2003 Andreas Nahr
//
//
// 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 System;
using System.ComponentModel;
using System.Runtime.InteropServices;
namespace System.ComponentModel {
[DesignerCategory ("Component")]
[ComVisible (true)]
[ClassInterface (ClassInterfaceType.AutoDispatch)]
public class Component : MarshalByRefObject, IComponent, IDisposable
{
private EventHandlerList event_handlers;
private ISite mySite;
static readonly object disposedEvent = new object ();
public Component ()
{
event_handlers = null;
}
protected virtual bool CanRaiseEvents {
get { return false; }
}
[Browsable (false), DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
public virtual ISite Site
{
get { return mySite; }
set { mySite = value; }
}
[Browsable (false), DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
public IContainer Container {
get {
if (mySite == null)
return null;
return mySite.Container;
}
}
[Browsable (false), DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
protected bool DesignMode {
get {
if (mySite == null)
return false;
return mySite.DesignMode;
}
}
protected EventHandlerList Events {
get {
// Note: space vs. time tradeoff
// We create the object here if it's never be accessed before. This potentially
// saves space. However, we must check each time the propery is accessed to
// determine whether we need to create the object, which increases overhead.
// We could put the creation in the contructor, but that would waste space
// if it were never used. However, accessing this property would be faster.
if (null == event_handlers)
event_handlers = new EventHandlerList();
return event_handlers;
}
}
~Component()
{
Dispose (false);
}
#if TARGET_JVM
public virtual void Dispose ()
{
Dispose (true);
}
#else
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
#endif
// <summary>
// Controls disposal of resources used by this.
// </summary>
//
// <param name="release_all"> Controls which resources are released</param>
//
// <remarks>
// if release_all is set to true, both managed and unmanaged
// resources should be released. If release_all is set to false,
// only unmanaged resources should be disposed
// </remarks>
protected virtual void Dispose (bool release_all)
{
if (release_all) {
if (mySite != null && mySite.Container != null)
mySite.Container.Remove (this);
EventHandler eh = (EventHandler) Events [disposedEvent];
if (eh != null)
eh (this, EventArgs.Empty);
}
}
protected virtual object GetService (Type service)
{
if (mySite != null) {
return mySite.GetService(service);
}
return null;
}
public override string ToString ()
{
if (mySite == null)
return GetType ().ToString ();
return String.Format ("{0} [{1}]", mySite.Name, GetType ().ToString ());
}
[Browsable (false), EditorBrowsable (EditorBrowsableState.Advanced)]
public event EventHandler Disposed {
add { Events.AddHandler (disposedEvent, value); }
remove { Events.RemoveHandler (disposedEvent, value); }
}
}
}
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