Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / Controls / UIElementCollection.cs / 1 / UIElementCollection.cs
//----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// File: UIElementCollection.cs
//
// Description: Contains the UIElementCollection base class.
//
// History:
// 07/18/2003 : greglett - Added to WCP branch
//
//---------------------------------------------------------------------------
using MS.Internal;
using System;
using System.Collections;
using System.Windows.Media;
using System.Windows.Threading;
using System.Windows.Markup;
namespace System.Windows.Controls
{
///
/// A UIElementCollection is a ordered collection of UIElements.
///
///
/// A UIElementCollection has implied context affinity. It is a violation to access
/// the collection from a different context than that of the owning Panel.
///
///
/// The colleciton is the children collection of the visualParent. The logicalParent
/// is used to do logical parenting. The flags is used to invalidate
/// the resource properties in the child tree, if an Application object exists.
///
/// The element of whom this is a children collection
/// The logicalParent of the elements of this collection.
/// if overriding Panel.CreateUIElementCollection, pass the logicalParent parameter of that method here.
///
public UIElementCollection(UIElement visualParent, FrameworkElement logicalParent)
{
if (visualParent == null)
{
throw new ArgumentNullException(SR.Get(SRID.Panel_NoNullVisualParent, "visualParent", this.GetType()));
}
_visualChildren = new VisualCollection(visualParent);
_visualParent = visualParent;
_logicalParent = logicalParent;
}
///
/// Gets the number of elements in the collection.
///
public virtual int Count
{
get { return _visualChildren.Count; }
}
///
/// Gets a value indicating whether access to the ICollection is synchronized (thread-safe).
/// For more details, see
public virtual bool IsSynchronized
{
get { return _visualChildren.IsSynchronized; }
}
///
/// For more details, see
public virtual object SyncRoot
{
get { return _visualChildren.SyncRoot; }
}
///
/// Copies the collection into the Array.
/// For more details, see
public virtual void CopyTo(Array array, int index)
{
_visualChildren.CopyTo(array, index);
}
///
/// Strongly typed version of CopyTo
/// Copies the collection into the Array.
/// For more details, see
public virtual void CopyTo(UIElement[] array, int index)
{
_visualChildren.CopyTo(array, index);
}
///
/// For more details, see
public virtual int Capacity
{
get { return _visualChildren.Capacity; }
set
{
VerifyWriteAccess();
_visualChildren.Capacity = value;
}
}
///
/// For more details, see
public virtual UIElement this[int index]
{
get { return _visualChildren[index] as UIElement; }
set
{
VerifyWriteAccess();
ValidateElement(value);
VisualCollection vc = _visualChildren;
//if setting new element into slot or assigning null,
//remove previously hooked element from the logical tree
if (vc[index] != value)
{
UIElement e = vc[index] as UIElement;
if (e != null)
ClearLogicalParent(e);
vc[index] = value;
SetLogicalParent(value);
_visualParent.InvalidateMeasure();
}
}
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void SetInternal(int index, UIElement item)
{
ValidateElement(item);
VisualCollection vc = _visualChildren;
if(vc[index] != item)
{
vc[index] = null; // explicitly disconnect the existing visual;
vc[index] = item;
_visualParent.InvalidateMeasure();
}
}
///
/// Adds the element to the UIElementCollection
/// For more details, see
public virtual int Add(UIElement element)
{
VerifyWriteAccess();
return AddInternal(element);
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal int AddInternal(UIElement element)
{
ValidateElement(element);
SetLogicalParent(element);
int retVal = _visualChildren.Add(element);
// invalidate measure on visual parent
_visualParent.InvalidateMeasure();
return retVal;
}
///
/// Returns the index of the element in the UIElementCollection
/// For more details, see
public virtual int IndexOf(UIElement element)
{
return _visualChildren.IndexOf(element);
}
///
/// Removes the specified element from the UIElementCollection.
/// For more details, see
public virtual void Remove(UIElement element)
{
VerifyWriteAccess();
_visualChildren.Remove(element);
ClearLogicalParent(element);
_visualParent.InvalidateMeasure();
}
///
/// Removes the specified element from the UIElementCollection.
/// Used only by ItemsControl and by VirtualizingStackPanel
/// For more details, see
internal virtual void RemoveNoVerify(UIElement element)
{
_visualChildren.Remove(element);
}
///
/// Determines whether a element is in the UIElementCollection.
/// For more details, see
public virtual bool Contains(UIElement element)
{
return _visualChildren.Contains(element);
}
///
/// Removes all elements from the UIElementCollection.
/// For more details, see
public virtual void Clear()
{
VerifyWriteAccess();
ClearInternal();
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void ClearInternal()
{
VisualCollection vc = _visualChildren;
int cnt = vc.Count;
if (cnt > 0)
{
// copy children in VisualCollection so that we can clear the visual link first,
// followed by the logical link
Visual[] visuals = new Visual[cnt];
for (int i = 0; i < cnt; i++)
{
visuals[i] = vc[i];
}
vc.Clear();
//disconnect from logical tree
for (int i = 0; i < cnt; i++)
{
UIElement e = visuals[i] as UIElement;
if (e != null)
{
ClearLogicalParent(e);
}
}
_visualParent.InvalidateMeasure();
}
}
///
/// Inserts an element into the UIElementCollection at the specified index.
/// For more details, see
public virtual void Insert(int index, UIElement element)
{
VerifyWriteAccess();
InsertInternal(index, element);
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void InsertInternal(int index, UIElement element)
{
ValidateElement(element);
SetLogicalParent(element);
_visualChildren.Insert(index, element);
_visualParent.InvalidateMeasure();
}
///
/// Removes the UIElement at the specified index.
/// For more details, see
public virtual void RemoveAt(int index)
{
VerifyWriteAccess();
VisualCollection vc = _visualChildren;
//disconnect from logical tree
UIElement e = vc[index] as UIElement;
vc.RemoveAt(index);
if (e != null)
ClearLogicalParent(e);
_visualParent.InvalidateMeasure();
}
///
/// Removes a range of Visuals from the VisualCollection.
/// For more details, see
public virtual void RemoveRange(int index, int count)
{
VerifyWriteAccess();
RemoveRangeInternal(index, count);
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void RemoveRangeInternal(int index, int count)
{
VisualCollection vc = _visualChildren;
int cnt = vc.Count;
if (count > (cnt - index))
{
count = cnt - index;
}
if (count > 0)
{
// copy children in VisualCollection so that we can clear the visual link first,
// followed by the logical link
Visual[] visuals = new Visual[count];
int i = index;
for (int loop = 0; loop < count; i++, loop++)
{
visuals[loop] = vc[i];
}
vc.RemoveRange(index, count);
//disconnect from logical tree
for (i = 0; i < count; i++)
{
UIElement e = visuals[i] as UIElement;
if (e != null)
{
ClearLogicalParent(e);
}
}
_visualParent.InvalidateMeasure();
}
}
///
/// Method that forwards to VisualCollection.Move
///
///
///
internal void MoveVisualChild(Visual visual, Visual destination)
{
_visualChildren.Move(visual, destination);
}
private UIElement Cast(object value)
{
if (value == null)
throw new System.ArgumentException(SR.Get(SRID.Collection_NoNull, "UIElementCollection"));
UIElement element = value as UIElement;
if (element == null)
throw new System.ArgumentException(SR.Get(SRID.Collection_BadType, "UIElementCollection", value.GetType().Name, "UIElement"));
return element;
}
#region IList Members
///
/// Adds an element to the UIElementCollection
///
int IList.Add(object value)
{
return Add(Cast(value));
}
///
/// Determines whether an element is in the UIElementCollection.
///
bool IList.Contains(object value)
{
return Contains(value as UIElement);
}
///
/// Returns the index of the element in the UIElementCollection
///
int IList.IndexOf(object value)
{
return IndexOf(value as UIElement);
}
///
/// Inserts an element into the UIElementCollection
///
void IList.Insert(int index, object value)
{
Insert(index, Cast(value));
}
///
///
bool IList.IsFixedSize
{
get { return false; }
}
///
///
bool IList.IsReadOnly
{
get { return false; }
}
///
/// Removes an element from the UIElementCollection
///
void IList.Remove(object value)
{
Remove(value as UIElement);
}
///
/// For more details, see
object IList.this[int index]
{
get
{
return this[index];
}
set
{
this[index] = Cast(value);
}
}
#endregion
// ---------------------------------------------------------------
// IEnumerable Interface
// ---------------------------------------------------------------
///
/// Returns an enumerator that can iterate through the collection.
///
/// Enumerator that enumerates the collection in order.
public virtual IEnumerator GetEnumerator()
{
return _visualChildren.GetEnumerator();
}
///
/// This method does logical parenting of the given element.
///
///
protected void SetLogicalParent(UIElement element)
{
if (_logicalParent != null)
{
_logicalParent.AddLogicalChild(element);
}
}
///
/// This method removes logical parenting when element goes away from the collection.
///
///
protected void ClearLogicalParent(UIElement element)
{
if (_logicalParent != null)
{
_logicalParent.RemoveLogicalChild(element);
}
}
///
/// Provides access to visual parent.
///
internal UIElement VisualParent
{
get { return (_visualParent); }
}
// Helper function to validate element; will throw exceptions if problems are detected.
private void ValidateElement(UIElement element)
{
if (element == null)
{
throw new ArgumentNullException(SR.Get(SRID.Panel_NoNullChildren, this.GetType()));
}
}
private void VerifyWriteAccess()
{
Panel p = _visualParent as Panel;
if (p != null && p.IsDataBound)
{
throw new InvalidOperationException(SR.Get(SRID.Panel_BoundPanel_NoChildren));
}
}
private readonly VisualCollection _visualChildren;
private readonly UIElement _visualParent;
private readonly FrameworkElement _logicalParent;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// File: UIElementCollection.cs
//
// Description: Contains the UIElementCollection base class.
//
// History:
// 07/18/2003 : greglett - Added to WCP branch
//
//---------------------------------------------------------------------------
using MS.Internal;
using System;
using System.Collections;
using System.Windows.Media;
using System.Windows.Threading;
using System.Windows.Markup;
namespace System.Windows.Controls
{
///
/// A UIElementCollection is a ordered collection of UIElements.
///
///
/// A UIElementCollection has implied context affinity. It is a violation to access
/// the collection from a different context than that of the owning Panel.
///
///
/// The colleciton is the children collection of the visualParent. The logicalParent
/// is used to do logical parenting. The flags is used to invalidate
/// the resource properties in the child tree, if an Application object exists.
///
/// The element of whom this is a children collection
/// The logicalParent of the elements of this collection.
/// if overriding Panel.CreateUIElementCollection, pass the logicalParent parameter of that method here.
///
public UIElementCollection(UIElement visualParent, FrameworkElement logicalParent)
{
if (visualParent == null)
{
throw new ArgumentNullException(SR.Get(SRID.Panel_NoNullVisualParent, "visualParent", this.GetType()));
}
_visualChildren = new VisualCollection(visualParent);
_visualParent = visualParent;
_logicalParent = logicalParent;
}
///
/// Gets the number of elements in the collection.
///
public virtual int Count
{
get { return _visualChildren.Count; }
}
///
/// Gets a value indicating whether access to the ICollection is synchronized (thread-safe).
/// For more details, see
public virtual bool IsSynchronized
{
get { return _visualChildren.IsSynchronized; }
}
///
/// For more details, see
public virtual object SyncRoot
{
get { return _visualChildren.SyncRoot; }
}
///
/// Copies the collection into the Array.
/// For more details, see
public virtual void CopyTo(Array array, int index)
{
_visualChildren.CopyTo(array, index);
}
///
/// Strongly typed version of CopyTo
/// Copies the collection into the Array.
/// For more details, see
public virtual void CopyTo(UIElement[] array, int index)
{
_visualChildren.CopyTo(array, index);
}
///
/// For more details, see
public virtual int Capacity
{
get { return _visualChildren.Capacity; }
set
{
VerifyWriteAccess();
_visualChildren.Capacity = value;
}
}
///
/// For more details, see
public virtual UIElement this[int index]
{
get { return _visualChildren[index] as UIElement; }
set
{
VerifyWriteAccess();
ValidateElement(value);
VisualCollection vc = _visualChildren;
//if setting new element into slot or assigning null,
//remove previously hooked element from the logical tree
if (vc[index] != value)
{
UIElement e = vc[index] as UIElement;
if (e != null)
ClearLogicalParent(e);
vc[index] = value;
SetLogicalParent(value);
_visualParent.InvalidateMeasure();
}
}
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void SetInternal(int index, UIElement item)
{
ValidateElement(item);
VisualCollection vc = _visualChildren;
if(vc[index] != item)
{
vc[index] = null; // explicitly disconnect the existing visual;
vc[index] = item;
_visualParent.InvalidateMeasure();
}
}
///
/// Adds the element to the UIElementCollection
/// For more details, see
public virtual int Add(UIElement element)
{
VerifyWriteAccess();
return AddInternal(element);
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal int AddInternal(UIElement element)
{
ValidateElement(element);
SetLogicalParent(element);
int retVal = _visualChildren.Add(element);
// invalidate measure on visual parent
_visualParent.InvalidateMeasure();
return retVal;
}
///
/// Returns the index of the element in the UIElementCollection
/// For more details, see
public virtual int IndexOf(UIElement element)
{
return _visualChildren.IndexOf(element);
}
///
/// Removes the specified element from the UIElementCollection.
/// For more details, see
public virtual void Remove(UIElement element)
{
VerifyWriteAccess();
_visualChildren.Remove(element);
ClearLogicalParent(element);
_visualParent.InvalidateMeasure();
}
///
/// Removes the specified element from the UIElementCollection.
/// Used only by ItemsControl and by VirtualizingStackPanel
/// For more details, see
internal virtual void RemoveNoVerify(UIElement element)
{
_visualChildren.Remove(element);
}
///
/// Determines whether a element is in the UIElementCollection.
/// For more details, see
public virtual bool Contains(UIElement element)
{
return _visualChildren.Contains(element);
}
///
/// Removes all elements from the UIElementCollection.
/// For more details, see
public virtual void Clear()
{
VerifyWriteAccess();
ClearInternal();
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void ClearInternal()
{
VisualCollection vc = _visualChildren;
int cnt = vc.Count;
if (cnt > 0)
{
// copy children in VisualCollection so that we can clear the visual link first,
// followed by the logical link
Visual[] visuals = new Visual[cnt];
for (int i = 0; i < cnt; i++)
{
visuals[i] = vc[i];
}
vc.Clear();
//disconnect from logical tree
for (int i = 0; i < cnt; i++)
{
UIElement e = visuals[i] as UIElement;
if (e != null)
{
ClearLogicalParent(e);
}
}
_visualParent.InvalidateMeasure();
}
}
///
/// Inserts an element into the UIElementCollection at the specified index.
/// For more details, see
public virtual void Insert(int index, UIElement element)
{
VerifyWriteAccess();
InsertInternal(index, element);
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void InsertInternal(int index, UIElement element)
{
ValidateElement(element);
SetLogicalParent(element);
_visualChildren.Insert(index, element);
_visualParent.InvalidateMeasure();
}
///
/// Removes the UIElement at the specified index.
/// For more details, see
public virtual void RemoveAt(int index)
{
VerifyWriteAccess();
VisualCollection vc = _visualChildren;
//disconnect from logical tree
UIElement e = vc[index] as UIElement;
vc.RemoveAt(index);
if (e != null)
ClearLogicalParent(e);
_visualParent.InvalidateMeasure();
}
///
/// Removes a range of Visuals from the VisualCollection.
/// For more details, see
public virtual void RemoveRange(int index, int count)
{
VerifyWriteAccess();
RemoveRangeInternal(index, count);
}
// Warning: this method is very dangerous because it does not prevent adding children
// into collection populated by generator. This may cause crashes if used incorrectly.
// Don't call this unless you are deriving a panel that is populating the collection
// in cooperation with the generator
internal void RemoveRangeInternal(int index, int count)
{
VisualCollection vc = _visualChildren;
int cnt = vc.Count;
if (count > (cnt - index))
{
count = cnt - index;
}
if (count > 0)
{
// copy children in VisualCollection so that we can clear the visual link first,
// followed by the logical link
Visual[] visuals = new Visual[count];
int i = index;
for (int loop = 0; loop < count; i++, loop++)
{
visuals[loop] = vc[i];
}
vc.RemoveRange(index, count);
//disconnect from logical tree
for (i = 0; i < count; i++)
{
UIElement e = visuals[i] as UIElement;
if (e != null)
{
ClearLogicalParent(e);
}
}
_visualParent.InvalidateMeasure();
}
}
///
/// Method that forwards to VisualCollection.Move
///
///
///
internal void MoveVisualChild(Visual visual, Visual destination)
{
_visualChildren.Move(visual, destination);
}
private UIElement Cast(object value)
{
if (value == null)
throw new System.ArgumentException(SR.Get(SRID.Collection_NoNull, "UIElementCollection"));
UIElement element = value as UIElement;
if (element == null)
throw new System.ArgumentException(SR.Get(SRID.Collection_BadType, "UIElementCollection", value.GetType().Name, "UIElement"));
return element;
}
#region IList Members
///
/// Adds an element to the UIElementCollection
///
int IList.Add(object value)
{
return Add(Cast(value));
}
///
/// Determines whether an element is in the UIElementCollection.
///
bool IList.Contains(object value)
{
return Contains(value as UIElement);
}
///
/// Returns the index of the element in the UIElementCollection
///
int IList.IndexOf(object value)
{
return IndexOf(value as UIElement);
}
///
/// Inserts an element into the UIElementCollection
///
void IList.Insert(int index, object value)
{
Insert(index, Cast(value));
}
///
///
bool IList.IsFixedSize
{
get { return false; }
}
///
///
bool IList.IsReadOnly
{
get { return false; }
}
///
/// Removes an element from the UIElementCollection
///
void IList.Remove(object value)
{
Remove(value as UIElement);
}
///
/// For more details, see
object IList.this[int index]
{
get
{
return this[index];
}
set
{
this[index] = Cast(value);
}
}
#endregion
// ---------------------------------------------------------------
// IEnumerable Interface
// ---------------------------------------------------------------
///
/// Returns an enumerator that can iterate through the collection.
///
/// Enumerator that enumerates the collection in order.
public virtual IEnumerator GetEnumerator()
{
return _visualChildren.GetEnumerator();
}
///
/// This method does logical parenting of the given element.
///
///
protected void SetLogicalParent(UIElement element)
{
if (_logicalParent != null)
{
_logicalParent.AddLogicalChild(element);
}
}
///
/// This method removes logical parenting when element goes away from the collection.
///
///
protected void ClearLogicalParent(UIElement element)
{
if (_logicalParent != null)
{
_logicalParent.RemoveLogicalChild(element);
}
}
///
/// Provides access to visual parent.
///
internal UIElement VisualParent
{
get { return (_visualParent); }
}
// Helper function to validate element; will throw exceptions if problems are detected.
private void ValidateElement(UIElement element)
{
if (element == null)
{
throw new ArgumentNullException(SR.Get(SRID.Panel_NoNullChildren, this.GetType()));
}
}
private void VerifyWriteAccess()
{
Panel p = _visualParent as Panel;
if (p != null && p.IsDataBound)
{
throw new InvalidOperationException(SR.Get(SRID.Panel_BoundPanel_NoChildren));
}
}
private readonly VisualCollection _visualChildren;
private readonly UIElement _visualParent;
private readonly FrameworkElement _logicalParent;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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