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/*************************************************************************************
Extended WPF Toolkit
Copyright (C) 2007-2013 Xceed Software Inc.
This program is provided to you under the terms of the Microsoft Public
License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license
For more features, controls, and fast professional support,
pick up the Plus Edition at http://xceed.com/wpf_toolkit
Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
***********************************************************************************/
using System;
using System.Windows;
using System.ComponentModel;
using System.Xml.Serialization;
namespace Xceed.Wpf.AvalonDock.Layout
{
[Serializable]
public abstract class LayoutElement : DependencyObject, ILayoutElement
{
#region Members
[NonSerialized]
private ILayoutContainer _parent = null;
[NonSerialized]
private ILayoutRoot _root = null;
#endregion
#region Constructors
internal LayoutElement()
{
}
#endregion
#region Properties
#region Parent
[XmlIgnore]
public ILayoutContainer Parent
{
get
{
return _parent;
}
set
{
if( _parent != value )
{
ILayoutContainer oldValue = _parent;
ILayoutRoot oldRoot = _root;
RaisePropertyChanging( "Parent" );
OnParentChanging( oldValue, value );
_parent = value;
OnParentChanged( oldValue, value );
_root = Root;
if( oldRoot != _root )
OnRootChanged( oldRoot, _root );
RaisePropertyChanged( "Parent" );
var root = Root as LayoutRoot;
if( root != null )
root.FireLayoutUpdated();
}
}
}
#endregion
#region Root
public ILayoutRoot Root
{
get
{
var parent = Parent;
while( parent != null && ( !( parent is ILayoutRoot ) ) )
{
parent = parent.Parent;
}
return parent as ILayoutRoot;
}
}
#endregion
#endregion
#region Public Methods
#if TRACE
public virtual void ConsoleDump(int tab)
{
System.Diagnostics.Trace.Write( new String( ' ', tab * 4 ) );
System.Diagnostics.Trace.WriteLine( this.ToString() );
}
#endif
#endregion
#region Internal Methods
/// <summary>
/// Provides derived classes an opportunity to handle execute code before to the Parent property changes.
/// </summary>
protected virtual void OnParentChanging( ILayoutContainer oldValue, ILayoutContainer newValue )
{
}
/// <summary>
/// Provides derived classes an opportunity to handle changes to the Parent property.
/// </summary>
protected virtual void OnParentChanged( ILayoutContainer oldValue, ILayoutContainer newValue )
{
}
protected virtual void OnRootChanged( ILayoutRoot oldRoot, ILayoutRoot newRoot )
{
if( oldRoot != null )
( ( LayoutRoot )oldRoot ).OnLayoutElementRemoved( this );
if( newRoot != null )
( ( LayoutRoot )newRoot ).OnLayoutElementAdded( this );
}
protected virtual void RaisePropertyChanged( string propertyName )
{
if( PropertyChanged != null )
PropertyChanged( this, new System.ComponentModel.PropertyChangedEventArgs( propertyName ) );
}
protected virtual void RaisePropertyChanging( string propertyName )
{
if( PropertyChanging != null )
PropertyChanging( this, new System.ComponentModel.PropertyChangingEventArgs( propertyName ) );
}
#endregion
#region Events
[field: NonSerialized]
[field: XmlIgnore]
public event PropertyChangedEventHandler PropertyChanged;
[field: NonSerialized]
[field: XmlIgnore]
public event PropertyChangingEventHandler PropertyChanging;
#endregion
}
}
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