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DependencyProperty.cs
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DependencyProperty.cs
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using System;
using System.Collections.Generic;
using System.Text;
namespace WindowlessControls
{
public class PropertyListener
{
internal static List<PropertyListener> myListeners = new List<PropertyListener>();
List<DependencyPropertyEventArgs> myChangeList = new List<DependencyPropertyEventArgs>();
internal void Add(DependencyPropertyEventArgs e)
{
myChangeList.Add(e);
}
public void StartListen()
{
myListeners.Add(this);
}
public void StopListen()
{
myListeners.Remove(this);
}
public void Undo()
{
foreach (DependencyPropertyEventArgs e in myChangeList)
{
if (e.Storage.Value == null)
{
if (e.NewValue == null)
e.Storage.Value = e.OldValue;
return;
}
if (e.Storage.Value.Equals(e.NewValue))
e.Storage.Value = e.OldValue;
}
}
}
public class DependencyPropertyEventArgs
{
object myOldValue;
public object OldValue
{
get { return myOldValue; }
}
object myNewValue;
public object NewValue
{
get { return myNewValue; }
}
DependencyPropertyStorage myStorage;
public DependencyPropertyStorage Storage
{
get { return myStorage; }
}
public DependencyPropertyEventArgs(DependencyPropertyStorage storage, object oldValue, object newValue)
{
myStorage = storage;
myOldValue = oldValue;
myNewValue = newValue;
}
}
public delegate void DependencyPropertyChangedEvent(object sender, DependencyPropertyEventArgs e);
public class DependencyPropertyStorage
{
object myOwner;
public DependencyPropertyStorage(object owner, object initialValue, DependencyPropertyChangedEvent changed)
{
myChanged = changed;
myOwner = owner;
myValue = initialValue;
}
object myValue;
public object Value
{
get
{
return myValue;
}
set
{
DependencyPropertyEventArgs e = new DependencyPropertyEventArgs(this, myValue, value);
myValue = value;
if ((e.OldValue == null && e.NewValue != null) || (e.OldValue != null && !e.OldValue.Equals(e.NewValue)))
{
foreach (PropertyListener pl in PropertyListener.myListeners)
{
pl.Add(e);
}
if (myChanged != null)
myChanged(this, e);
}
}
}
DependencyPropertyChangedEvent myChanged;
}
public class DependencyPropertyStorage<T> : DependencyPropertyStorage
{
public DependencyPropertyStorage(object owner, object initialValue, DependencyPropertyChangedEvent changed)
: base(owner, initialValue, changed)
{
}
public new T Value
{
get
{
return (T)base.Value;
}
set
{
base.Value = value;
}
}
public static implicit operator T(DependencyPropertyStorage<T> o)
{
return o.Value;
}
}
}