Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / RangeContentEnumerator.cs / 1305600 / RangeContentEnumerator.cs
#pragma warning disable 1634, 1691 // To enable presharp warning disables (#pragma suppress) below.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: IEnumerator for TextRange and TextElement content.
//
//
// History:
// 05/27/2003 : [....] - Created
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using MS.Internal;
using System.Text;
using MS.Utility;
using System.Windows.Controls;
#pragma warning disable 1634, 1691 // suppressing PreSharp warnings
namespace System.Windows.Documents
{
internal class RangeContentEnumerator : IEnumerator
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Creates an enumerator instance.
// Null start/end creates an empty enumerator.
internal RangeContentEnumerator(TextPointer start, TextPointer end)
{
Invariant.Assert(start != null && end != null || start == null && end == null, "If start is null end should be null!");
_start = start;
_end = end;
// Remember what generation the backing store was in when we started,
// so we can throw if this enumerator is accessed after content has
// changed.
if (_start != null)
{
_generation = _start.TextContainer.Generation;
}
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
#region Public Methods
///
/// Return the current object this enumerator is pointing to. This is
/// generally a FrameworkElement, TextElement, an embedded
/// object, or Text content.
///
public object Current
{
get
{
int runLength;
int offset;
if (_navigator == null)
{
// Disable presharp 6503: Property get methods should not throw exceptions.
// We must throw here -- it's part of the IEnumerator contract.
#pragma warning suppress 6503
throw new InvalidOperationException(SR.Get(SRID.EnumeratorNotStarted));
}
// Check _currentCache before looking at _navigator. For the
// last item in the enumeration, _navigator == _end, but
// that's ok, the previous get_Current call (which sets _currentCache
// non-null) put it there.
if (_currentCache != null)
{
return _currentCache;
}
if (_navigator.CompareTo(_end) >= 0)
{
#pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception
throw new InvalidOperationException(SR.Get(SRID.EnumeratorReachedEnd));
}
// Throw if the tree has been modified since this enumerator was created unless a tree walk
// by the property system is in progress. For example, changing DataContext on FlowDocument
// can invalidate a binding on Run.Text during the inherited property change tree walk,
// which in turn can modify the TextContainer.
if (_generation != _start.TextContainer.Generation && !IsLogicalChildrenIterationInProgress)
{
#pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception
throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged));
}
switch (_navigator.GetPointerContext(LogicalDirection.Forward))
{
case TextPointerContext.Text:
offset = 0;
// Merge all successive text runs into a single value.
do
{
runLength = _navigator.GetTextRunLength(LogicalDirection.Forward);
EnsureBufferCapacity(offset + runLength);
_navigator.GetTextInRun(LogicalDirection.Forward, _buffer, offset, runLength);
offset += runLength;
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
while (_navigator.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text);
_currentCache = new string(_buffer, 0, offset);
// _navigator is at next content.
break;
case TextPointerContext.EmbeddedElement:
_currentCache = _navigator.GetAdjacentElement(LogicalDirection.Forward);
// Position _navigator at next content.
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
break;
case TextPointerContext.ElementStart:
// Return the element, and advance past its entire content.
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
_currentCache = _navigator.Parent;
// Position _navigator at next content.
_navigator.MoveToElementEdge(ElementEdge.AfterEnd);
break;
default:
Invariant.Assert(false, "Unexpected run type!");
_currentCache = null; // We should never get here.
break;
}
return _currentCache;
}
}
///
/// Advance the enumerator to the next object in the range. Return true if content
/// was found.
///
public bool MoveNext()
{
// Throw if the tree has been modified since this enumerator was created unless a tree walk
// by the property system is in progress. For example, changing DataContext on FlowDocument
// can invalidate a binding on Run.Text during the inherited property change tree walk,
// which in turn can modify the TextContainer.
if (_start != null && _generation != _start.TextContainer.Generation && !IsLogicalChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged));
}
if (_start == null || _start.CompareTo(_end) == 0)
return false;
if (_navigator != null && _navigator.CompareTo(_end) >= 0)
{
return false;
}
if (_navigator == null)
{
_navigator = new TextPointer(_start);
}
else if (_currentCache == null) // If we have a cache, _navigator is already positioned at the next item.
{
switch (_navigator.GetPointerContext(LogicalDirection.Forward))
{
case TextPointerContext.Text:
// Skip all successive text runs as a single value.
do
{
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
while (_navigator.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text && _navigator.CompareTo(_end) < 0);
break;
case TextPointerContext.EmbeddedElement:
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
break;
case TextPointerContext.ElementStart:
// Return the element, and advance past its entire content.
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
_navigator.MoveToPosition(((TextElement)_navigator.Parent).ElementEnd);
break;
default:
Invariant.Assert(false, "Unexpected run type!");
break;
}
}
_currentCache = null;
return (_navigator.CompareTo(_end) < 0);
}
///
/// Reset the enumerator to the start of the range.
///
public void Reset()
{
// Throw if the tree has been modified since this enumerator was created.
if (_start != null && _generation != _start.TextContainer.Generation)
{
throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged));
}
_navigator = null;
}
#endregion Public Methods
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
#endregion Public Properties
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
#region Public Events
#endregion Public Events
//-----------------------------------------------------
//
// Protected Methods
//
//-----------------------------------------------------
#region Protected Methods
#endregion Protected Events
//-----------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
#endregion Internal methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
#endregion Internal Properties
//------------------------------------------------------
//
// Internal Events
//
//-----------------------------------------------------
#region Internal Events
#endregion Internal Events
//------------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
private void EnsureBufferCapacity(int size)
{
char [] newBuffer;
if (_buffer == null)
{
_buffer = new char[size];
}
else if (_buffer.Length < size)
{
newBuffer = new char[Math.Max(2*_buffer.Length, size)];
_buffer.CopyTo(newBuffer, 0);
_buffer = newBuffer;
}
}
#endregion Private methods
//-----------------------------------------------------
//
// Private Properties
//
//-----------------------------------------------------
#region Private Properties
private bool IsLogicalChildrenIterationInProgress
{
get
{
DependencyObject node = _start.Parent;
while (node != null)
{
FrameworkElement fe = node as FrameworkElement;
if (fe != null)
{
if (fe.IsLogicalChildrenIterationInProgress)
{
return true;
}
}
else
{
FrameworkContentElement fce = node as FrameworkContentElement;
if (fce != null && fce.IsLogicalChildrenIterationInProgress)
{
return true;
}
}
node = LogicalTreeHelper.GetParent(node);
}
return false;
}
}
#endregion Private Properties
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
// Edges of the span to enumerator over.
private readonly TextPointer _start;
private readonly TextPointer _end;
// Backing store generation when this enumerator was created.
private readonly uint _generation;
// Current position in the enumeration.
private TextPointer _navigator;
// Calculated content at the current position.
private object _currentCache;
// Buffer to text content retrieval.
private char [] _buffer;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
#pragma warning disable 1634, 1691 // To enable presharp warning disables (#pragma suppress) below.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: IEnumerator for TextRange and TextElement content.
//
//
// History:
// 05/27/2003 : [....] - Created
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using MS.Internal;
using System.Text;
using MS.Utility;
using System.Windows.Controls;
#pragma warning disable 1634, 1691 // suppressing PreSharp warnings
namespace System.Windows.Documents
{
internal class RangeContentEnumerator : IEnumerator
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Creates an enumerator instance.
// Null start/end creates an empty enumerator.
internal RangeContentEnumerator(TextPointer start, TextPointer end)
{
Invariant.Assert(start != null && end != null || start == null && end == null, "If start is null end should be null!");
_start = start;
_end = end;
// Remember what generation the backing store was in when we started,
// so we can throw if this enumerator is accessed after content has
// changed.
if (_start != null)
{
_generation = _start.TextContainer.Generation;
}
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
#region Public Methods
///
/// Return the current object this enumerator is pointing to. This is
/// generally a FrameworkElement, TextElement, an embedded
/// object, or Text content.
///
public object Current
{
get
{
int runLength;
int offset;
if (_navigator == null)
{
// Disable presharp 6503: Property get methods should not throw exceptions.
// We must throw here -- it's part of the IEnumerator contract.
#pragma warning suppress 6503
throw new InvalidOperationException(SR.Get(SRID.EnumeratorNotStarted));
}
// Check _currentCache before looking at _navigator. For the
// last item in the enumeration, _navigator == _end, but
// that's ok, the previous get_Current call (which sets _currentCache
// non-null) put it there.
if (_currentCache != null)
{
return _currentCache;
}
if (_navigator.CompareTo(_end) >= 0)
{
#pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception
throw new InvalidOperationException(SR.Get(SRID.EnumeratorReachedEnd));
}
// Throw if the tree has been modified since this enumerator was created unless a tree walk
// by the property system is in progress. For example, changing DataContext on FlowDocument
// can invalidate a binding on Run.Text during the inherited property change tree walk,
// which in turn can modify the TextContainer.
if (_generation != _start.TextContainer.Generation && !IsLogicalChildrenIterationInProgress)
{
#pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception
throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged));
}
switch (_navigator.GetPointerContext(LogicalDirection.Forward))
{
case TextPointerContext.Text:
offset = 0;
// Merge all successive text runs into a single value.
do
{
runLength = _navigator.GetTextRunLength(LogicalDirection.Forward);
EnsureBufferCapacity(offset + runLength);
_navigator.GetTextInRun(LogicalDirection.Forward, _buffer, offset, runLength);
offset += runLength;
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
while (_navigator.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text);
_currentCache = new string(_buffer, 0, offset);
// _navigator is at next content.
break;
case TextPointerContext.EmbeddedElement:
_currentCache = _navigator.GetAdjacentElement(LogicalDirection.Forward);
// Position _navigator at next content.
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
break;
case TextPointerContext.ElementStart:
// Return the element, and advance past its entire content.
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
_currentCache = _navigator.Parent;
// Position _navigator at next content.
_navigator.MoveToElementEdge(ElementEdge.AfterEnd);
break;
default:
Invariant.Assert(false, "Unexpected run type!");
_currentCache = null; // We should never get here.
break;
}
return _currentCache;
}
}
///
/// Advance the enumerator to the next object in the range. Return true if content
/// was found.
///
public bool MoveNext()
{
// Throw if the tree has been modified since this enumerator was created unless a tree walk
// by the property system is in progress. For example, changing DataContext on FlowDocument
// can invalidate a binding on Run.Text during the inherited property change tree walk,
// which in turn can modify the TextContainer.
if (_start != null && _generation != _start.TextContainer.Generation && !IsLogicalChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged));
}
if (_start == null || _start.CompareTo(_end) == 0)
return false;
if (_navigator != null && _navigator.CompareTo(_end) >= 0)
{
return false;
}
if (_navigator == null)
{
_navigator = new TextPointer(_start);
}
else if (_currentCache == null) // If we have a cache, _navigator is already positioned at the next item.
{
switch (_navigator.GetPointerContext(LogicalDirection.Forward))
{
case TextPointerContext.Text:
// Skip all successive text runs as a single value.
do
{
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
while (_navigator.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text && _navigator.CompareTo(_end) < 0);
break;
case TextPointerContext.EmbeddedElement:
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
break;
case TextPointerContext.ElementStart:
// Return the element, and advance past its entire content.
_navigator.MoveToNextContextPosition(LogicalDirection.Forward);
_navigator.MoveToPosition(((TextElement)_navigator.Parent).ElementEnd);
break;
default:
Invariant.Assert(false, "Unexpected run type!");
break;
}
}
_currentCache = null;
return (_navigator.CompareTo(_end) < 0);
}
///
/// Reset the enumerator to the start of the range.
///
public void Reset()
{
// Throw if the tree has been modified since this enumerator was created.
if (_start != null && _generation != _start.TextContainer.Generation)
{
throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged));
}
_navigator = null;
}
#endregion Public Methods
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
#endregion Public Properties
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
#region Public Events
#endregion Public Events
//-----------------------------------------------------
//
// Protected Methods
//
//-----------------------------------------------------
#region Protected Methods
#endregion Protected Events
//-----------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
#endregion Internal methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
#endregion Internal Properties
//------------------------------------------------------
//
// Internal Events
//
//-----------------------------------------------------
#region Internal Events
#endregion Internal Events
//------------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
private void EnsureBufferCapacity(int size)
{
char [] newBuffer;
if (_buffer == null)
{
_buffer = new char[size];
}
else if (_buffer.Length < size)
{
newBuffer = new char[Math.Max(2*_buffer.Length, size)];
_buffer.CopyTo(newBuffer, 0);
_buffer = newBuffer;
}
}
#endregion Private methods
//-----------------------------------------------------
//
// Private Properties
//
//-----------------------------------------------------
#region Private Properties
private bool IsLogicalChildrenIterationInProgress
{
get
{
DependencyObject node = _start.Parent;
while (node != null)
{
FrameworkElement fe = node as FrameworkElement;
if (fe != null)
{
if (fe.IsLogicalChildrenIterationInProgress)
{
return true;
}
}
else
{
FrameworkContentElement fce = node as FrameworkContentElement;
if (fce != null && fce.IsLogicalChildrenIterationInProgress)
{
return true;
}
}
node = LogicalTreeHelper.GetParent(node);
}
return false;
}
}
#endregion Private Properties
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
// Edges of the span to enumerator over.
private readonly TextPointer _start;
private readonly TextPointer _end;
// Backing store generation when this enumerator was created.
private readonly uint _generation;
// Current position in the enumeration.
private TextPointer _navigator;
// Calculated content at the current position.
private object _currentCache;
// Buffer to text content retrieval.
private char [] _buffer;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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