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// 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.
//
// Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
//
// Authors:
// Chris Toshok (toshok@ximian.com)
// Loïc Rebmeister (fox2code@gmail.com)
//
namespace System.Windows {
public abstract class Freezable : DependencyObject {
bool frozen = false;
protected Freezable () {
}
internal delegate Freezable cloneDelegate (Freezable freezable);
internal void cloneImpl (Freezable source, cloneDelegate cloneFreezable,bool freeze)
{
var e = source.GetLocalValueEnumerator ();
while (e.MoveNext ()) {
var value = e.Current.Value;
if (e.Current.Property.ReadOnly || value == DependencyProperty.UnsetValue || value == null)
continue;
if (value is Freezable && !(freeze && (value as Freezable).frozen))
value = cloneFreezable (value as Freezable);
SetValue (e.Current.Property, value);
}
if (freeze)
Freeze ();
}
public Freezable Clone ()
{
var freezable = this.CreateInstance ();
freezable.CloneCore (this);
return freezable;
}
protected virtual void CloneCore (Freezable sourceFreezable)
{
cloneImpl (sourceFreezable, freezable => freezable.Clone (), false);
}
public Freezable CloneCurrentValue ()
{
var freezable = this.CreateInstance ();
freezable.CloneCurrentValueCore (this);
return freezable;
}
protected virtual void CloneCurrentValueCore (Freezable sourceFreezable)
{
cloneImpl (sourceFreezable, freezable => freezable.CloneCurrentValue (), false);
}
protected Freezable CreateInstance ()
{
return CreateInstanceCore ();
}
protected abstract Freezable CreateInstanceCore ();
public void Freeze ()
{
if (!FreezeCore (false))
throw new InvalidOperationException ("The Freezable cannot be made unmodifiable.");
}
protected static bool Freeze (Freezable freezable,
bool isChecking)
{
if (freezable.frozen)
return true;
LocalValueEnumerator e = freezable.GetLocalValueEnumerator ();
while (e.MoveNext ()) {
var value = e.Current.Value;
if (value is Freezable) {
if(!(value as Freezable).FreezeCore (isChecking))
return false;
}
}
if (!isChecking)
freezable.frozen = true;
return true;
}
protected virtual bool FreezeCore (bool isChecking)
{
return Freeze (this, isChecking);
}
public Freezable GetAsFrozen ()
{
var freezable = this.CreateInstance ();
freezable.GetAsFrozenCore (this);
return freezable;
}
protected virtual void GetAsFrozenCore (Freezable sourceFreezable)
{
cloneImpl (sourceFreezable, freezable => freezable.GetAsFrozen (), true);
}
public Freezable GetCurrentValueAsFrozen ()
{
var freezable = this.CreateInstance ();
freezable.GetCurrentValueAsFrozenCore (this);
return freezable;
}
protected virtual void GetCurrentValueAsFrozenCore (Freezable sourceFreezable)
{
cloneImpl (sourceFreezable, freezable => freezable.GetCurrentValueAsFrozen (), true);
}
protected virtual void OnChanged ()
{
}
[MonoTODO]
protected void OnFreezablePropertyChanged (DependencyObject oldValue,
DependencyObject newValue)
{
}
[MonoTODO]
protected void OnFreezablePropertyChanged (DependencyObject oldValue,
DependencyObject newValue,
DependencyProperty property)
{
}
protected override void OnPropertyChanged (DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged (e);
// Note: Handler need to be called on all DependencyObject properties
if (typeof (DependencyObject).IsAssignableFrom (e.Property.PropertyType)) {
var oldValue = e.OldValue as DependencyObject;
var newValue = e.NewValue as DependencyObject;
OnFreezablePropertyChanged (oldValue, newValue, e.Property);
OnFreezablePropertyChanged (oldValue, newValue);
}
Changed?.Invoke (this, EventArgs.Empty);
}
protected void ReadPreamble ()
{
VerifyAccess ();
}
protected void WritePostscript ()
{
Changed?.Invoke (this, EventArgs.Empty);
OnChanged ();
}
protected void WritePreamble ()
{
VerifyAccess ();
if (frozen)
throw new InvalidOperationException ("The Freezable instance is frozen and cannot have its members written to.");
}
public bool CanFreeze {
get { return FreezeCore (true); }
}
public bool IsFrozen {
get { return frozen; }
}
public event EventHandler Changed;
}
}
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