EventBindingService.cs :  » 2.6.4-mono-.net-core » System.ComponentModel » System » ComponentModel » Design » C# / CSharp Open Source

//
// System.ComponentModel.Design.EventBindingService
// 
// Authors:   
//    Ivan N. Zlatev (contact i-nZ.net)
//
// (C) 2007 Ivan N. Zlatev

//
// 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.
//

#if NET_2_0

using System;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;

namespace System.ComponentModel.Design{
  public abstract class EventBindingService : IEventBindingService
  {

    private IServiceProvider _provider;

    protected EventBindingService (IServiceProvider provider)
    {
      if (provider == null)
        throw new ArgumentNullException ("provider");
      _provider = provider;
    }
          
    protected abstract bool ShowCode (IComponent component, EventDescriptor e, string methodName);
    protected abstract bool ShowCode (int lineNumber);
    protected abstract bool ShowCode ();
    protected abstract string CreateUniqueMethodName (IComponent component, EventDescriptor eventDescriptor);
    protected abstract ICollection GetCompatibleMethods (EventDescriptor eventDescriptor);

    protected virtual void FreeMethod (IComponent component, EventDescriptor e, string methodName)
    {
    }

    protected virtual void UseMethod (IComponent component, EventDescriptor e, string methodName)
    {
    }


    protected virtual void ValidateMethodName (string methodName)
    {
    }
 

    protected object GetService (Type service)
    {
      if (_provider != null)
        return _provider.GetService (service);
      return null;
    }

#region IEventBindingService implementation

    string IEventBindingService.CreateUniqueMethodName (IComponent component, EventDescriptor eventDescriptor)
    {
      if (eventDescriptor == null)
        throw new ArgumentNullException ("eventDescriptor");
      if (component == null)
        throw new ArgumentNullException ("component");

      return this.CreateUniqueMethodName (component, eventDescriptor);
    }

    ICollection IEventBindingService.GetCompatibleMethods (EventDescriptor eventDescriptor)
    {
      if (eventDescriptor == null)
        throw new ArgumentNullException ("eventDescriptor");

      return this.GetCompatibleMethods (eventDescriptor);
    }

    EventDescriptor IEventBindingService.GetEvent (PropertyDescriptor property)
    {
      if (property == null)
        throw new ArgumentNullException ("property");

      EventPropertyDescriptor eventPropDescriptor = property as EventPropertyDescriptor;
      if (eventPropDescriptor == null)
        return null;
      
      return eventPropDescriptor.InternalEventDescriptor;
    }

    PropertyDescriptorCollection IEventBindingService.GetEventProperties (EventDescriptorCollection events)
    {
      if (events == null)
        throw new ArgumentNullException ("events");

      List<PropertyDescriptor> properties = new List <PropertyDescriptor>();
      foreach (EventDescriptor eventDescriptor in events)
        properties.Add (((IEventBindingService)this).GetEventProperty (eventDescriptor));
        
      return new PropertyDescriptorCollection (properties.ToArray ());
    }

    PropertyDescriptor IEventBindingService.GetEventProperty (EventDescriptor eventDescriptor)
    {
      if (eventDescriptor == null) 
        throw new ArgumentNullException ("eventDescriptor");

      return new EventPropertyDescriptor (eventDescriptor);
    }

    bool IEventBindingService.ShowCode (IComponent component, EventDescriptor eventDescriptor)
    {
      if (component == null)
        throw new ArgumentNullException ("component");
      if (eventDescriptor == null)
        throw new ArgumentNullException ("eventDescriptor");

      return this.ShowCode (component, eventDescriptor, (string) ((IEventBindingService)this).GetEventProperty (eventDescriptor).GetValue (component));
    }

    bool IEventBindingService.ShowCode (int lineNumber)
    {
      return this.ShowCode (lineNumber);
    }

    bool IEventBindingService.ShowCode ()
    {
      return this.ShowCode ();
    }
#endregion

  }

  internal class EventPropertyDescriptor : PropertyDescriptor
  {
    private EventDescriptor _eventDescriptor;
  
    public EventPropertyDescriptor (EventDescriptor eventDescriptor)
      : base (eventDescriptor)
    {
      if (eventDescriptor == null)
        throw new ArgumentNullException ("eventDescriptor");
      _eventDescriptor = eventDescriptor;
    }
    
    public override bool CanResetValue (object component)
    {
      return true;
    }

    public override Type ComponentType {
      get { return _eventDescriptor.ComponentType; }
    }

    public override bool IsReadOnly {
      get { return false; }
    }

    public override Type PropertyType {
      get { return _eventDescriptor.EventType; }
    }

    public override void ResetValue (object component)
    {
      this.SetValue (component, null);
    }

    public override object GetValue (object component)
    {
      if (component is IComponent && ((IComponent)component).Site != null) {
        IDictionaryService dictionary = ((IComponent)component).Site.GetService (typeof (IDictionaryService)) as IDictionaryService;
        if (dictionary != null)
          return dictionary.GetValue (base.Name);
      }
      return null;
    }

    public override void SetValue (object component, object value)
    {
      if (component is IComponent && ((IComponent)component).Site != null) {
        IDictionaryService dictionary = ((IComponent)component).Site.GetService (typeof (IDictionaryService)) as IDictionaryService;
        if (dictionary != null)
          dictionary.SetValue (base.Name, value);
      }
    }

    public override bool ShouldSerializeValue (object component)
    {
      if (this.GetValue (component) != null)
        return true;
      return false;
    }
    
    public override TypeConverter Converter {
      get { return TypeDescriptor.GetConverter (String.Empty); }
    }
    
    internal EventDescriptor InternalEventDescriptor {
      get { return _eventDescriptor; }
    }
  }
}
#endif