Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / System / Windows / Controls / Primitives / DocumentPageView.cs / 1 / DocumentPageView.cs
//----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// File: DocumentPageView.cs
//
// Description: Provides a view port for a page of content for a DocumentPage.
//
//---------------------------------------------------------------------------
using System.Windows.Automation; // AutomationPattern
using System.Windows.Automation.Peers; // AutomationPeer
using System.Windows.Controls; // StretchDirection
using System.Windows.Controls.Primitives; // DocumentViewerBase
using System.Windows.Documents; // DocumentPaginator
using System.Windows.Media; // Visual
using System.Windows.Media.Imaging; // RenderTargetBitmap
using System.Windows.Threading; // Dispatcher
using MS.Internal; // Invariant
using MS.Internal.Documents; // DocumentPageHost, DocumentPageTextView
using MS.Internal.Automation; // TextAdaptor
using MS.Internal.KnownBoxes; // BooleanBoxes
namespace System.Windows.Controls.Primitives
{
///
/// Provides a view port for a page of content for a DocumentPage.
///
public class DocumentPageView : FrameworkElement, IServiceProvider, IDisposable
{
//-------------------------------------------------------------------
//
// Constructors
//
//-------------------------------------------------------------------
#region Constructors
///
/// Create an instance of a DocumentPageView.
///
///
/// This does basic initialization of the DocumentPageView. All subclasses
/// must call the base constructor to perform this initialization.
///
public DocumentPageView() : base()
{
_pageZoom = 1.0;
}
///
/// Static ctor. Initializes property metadata.
///
static DocumentPageView()
{
ClipToBoundsProperty.OverrideMetadata(typeof(DocumentPageView), new PropertyMetadata(BooleanBoxes.TrueBox));
}
#endregion
//--------------------------------------------------------------------
//
// Public Properties
//
//-------------------------------------------------------------------
#region Public Properties
///
/// The Paginator from which this DocumentPageView retrieves pages.
///
public DocumentPaginator DocumentPaginator
{
get { return _documentPaginator; }
set
{
CheckDisposed();
if (_documentPaginator != value)
{
// Cleanup all state associated with old Paginator.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted -= new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged -= new PagesChangedEventHandler(HandlePagesChanged);
DisposeCurrentPage();
DisposeAsyncPage();
}
Invariant.Assert(_documentPage == null);
Invariant.Assert(_documentPageAsync == null);
_documentPaginator = value;
_textView = null;
// Register for events on new Paginator and invalidate
// measure to force content update.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted += new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged += new PagesChangedEventHandler(HandlePagesChanged);
}
InvalidateMeasure();
}
}
}
///
/// The DocumentPage for the displayed page.
///
public DocumentPage DocumentPage
{
get { return (_documentPage == null) ? DocumentPage.Missing : _documentPage; }
}
///
/// The page number displayed; no content is displayed if this number is negative.
/// PageNumber is zero-based.
///
public int PageNumber
{
get { return (int) GetValue(PageNumberProperty); }
set { SetValue(PageNumberProperty, value); }
}
///
/// Controls the stretching behavior for the page.
///
public Stretch Stretch
{
get { return (Stretch)GetValue(StretchProperty); }
set { SetValue(StretchProperty, value); }
}
///
/// Specifies the directions in which page may be stretched.
///
public StretchDirection StretchDirection
{
get { return (StretchDirection)GetValue(StretchDirectionProperty); }
set { SetValue(StretchDirectionProperty, value); }
}
#region Public Dynamic Properties
///
///
public static readonly DependencyProperty PageNumberProperty =
DependencyProperty.Register(
"PageNumber",
typeof(int),
typeof(DocumentPageView),
new FrameworkPropertyMetadata(
0,
FrameworkPropertyMetadataOptions.AffectsMeasure,
new PropertyChangedCallback(OnPageNumberChanged)));
///
///
public static readonly DependencyProperty StretchProperty =
Viewbox.StretchProperty.AddOwner(
typeof(DocumentPageView),
new FrameworkPropertyMetadata(
Stretch.Uniform,
FrameworkPropertyMetadataOptions.AffectsMeasure));
///
///
public static readonly DependencyProperty StretchDirectionProperty =
Viewbox.StretchDirectionProperty.AddOwner(
typeof(DocumentPageView),
new FrameworkPropertyMetadata(
StretchDirection.DownOnly,
FrameworkPropertyMetadataOptions.AffectsMeasure));
#endregion Public Dynamic Properties
#endregion Public Properties
//--------------------------------------------------------------------
//
// Public Events
//
//--------------------------------------------------------------------
#region Public Events
///
/// Fired after a DocumentPage.Visual is connected.
///
public event EventHandler PageConnected;
///
/// Fired after a DocumentPage.Visual is disconnected.
///
public event EventHandler PageDisconnected;
#endregion Public Events
//-------------------------------------------------------------------
//
// Protected Methods
//
//--------------------------------------------------------------------
#region Protected Methods
///
/// Content measurement.
///
/// Available size that parent can give to the child. This is soft constraint.
/// The DocumentPageView's desired size.
protected override sealed Size MeasureOverride(Size availableSize)
{
Size newPageSize, pageZoom;
Size pageSize;
Size desiredSize = new Size(); // If no page is available, return (0,0) as size.
CheckDisposed();
if (_suspendLayout)
{
desiredSize = this.DesiredSize;
}
else if (_documentPaginator != null)
{
// Reflow content if needed.
if (ShouldReflowContent())
{
// Reflow is disabled when dealing with infinite size in both directions.
// If only one dimention is infinte, calculate value based on PageSize of the
// document and Stretching properties.
if (!Double.IsInfinity(availableSize.Width) || !Double.IsInfinity(availableSize.Height))
{
pageSize = _documentPaginator.PageSize;
if (Double.IsInfinity(availableSize.Width))
{
newPageSize = new Size();
newPageSize.Height = availableSize.Height / _pageZoom;
newPageSize.Width = newPageSize.Height * (pageSize.Width / pageSize.Height); // Keep aspect ratio.
}
else if (Double.IsInfinity(availableSize.Height))
{
newPageSize = new Size();
newPageSize.Width = availableSize.Width / _pageZoom;
newPageSize.Height = newPageSize.Width * (pageSize.Height / pageSize.Width); // Keep aspect ratio.
}
else
{
newPageSize = new Size(availableSize.Width / _pageZoom, availableSize.Height / _pageZoom);
}
if (!DoubleUtil.AreClose(pageSize, newPageSize))
{
_documentPaginator.PageSize = newPageSize;
}
}
}
// If the main page or pending async page are not available yet,
// asynchronously request new page from Paginator.
if (_documentPage == null && _documentPageAsync == null)
{
if (PageNumber >= 0)
{
if (_useAsynchronous)
{
_documentPaginator.GetPageAsync(PageNumber, this);
}
else
{
_documentPageAsync = _documentPaginator.GetPage(PageNumber);
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
}
}
else
{
_documentPage = DocumentPage.Missing;
}
}
// If pending async page is available, discard the main page and
// set _documentPage to _documentPageAsync.
if (_documentPageAsync != null)
{
// Do cleanup for currently used page, because it gets replaced.
DisposeCurrentPage();
// DisposeCurrentPage raises PageDisposed and DocumentPage.PageDestroyed events.
// Handlers for those events may dispose _documentPageAsync. Treat this situation
// as missing page.
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
if (_pageVisualClone != null)
{
RemoveDuplicateVisual();
}
// Replace the main page with cached async page.
_documentPage = _documentPageAsync;
if (_documentPage != DocumentPage.Missing)
{
_documentPage.PageDestroyed += new EventHandler(HandlePageDestroyed);
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
_documentPageAsync = null;
// Set a flag that will indicate that a PageConnected must be fired in
// ArrangeOverride
_newPageConnected = true;
}
// If page is available, return its size as desired size.
if (_documentPage != null && _documentPage != DocumentPage.Missing)
{
pageSize = new Size(_documentPage.Size.Width * _pageZoom, _documentPage.Size.Height * _pageZoom);
pageZoom = Viewbox.ComputeScaleFactor(availableSize, pageSize, this.Stretch, this.StretchDirection);
desiredSize = new Size(pageSize.Width * pageZoom.Width, pageSize.Height * pageZoom.Height);
}
if (_pageVisualClone != null)
{
desiredSize = _visualCloneSize;
}
}
return desiredSize;
}
///
/// Content arrangement.
///
/// The final size that element should use to arrange itself and its children.
protected override sealed Size ArrangeOverride(Size finalSize)
{
Transform pageTransform;
ScaleTransform pageScaleTransform;
Visual pageVisual;
Size pageSize, pageZoom;
CheckDisposed();
if (_pageVisualClone == null)
{
if (_pageHost == null)
{
_pageHost = new DocumentPageHost();
this.AddVisualChild(_pageHost);
}
Invariant.Assert(_pageHost != null);
pageVisual = (_documentPage == null) ? null : _documentPage.Visual;
if (pageVisual == null)
{
// Remove existing visiual children.
_pageHost.PageVisual = null;
// Reset offset and transform on the page host before Arrange
_pageHost.CachedOffset = new Point();
_pageHost.RenderTransform = null;
// Size for the page host needs to be set to finalSize
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, finalSize));
}
else
{
// Add visual representing the page contents. For performance reasons
// first check if it is already insered there.
if (_pageHost.PageVisual != pageVisual)
{
// There might be a case where a visual associated with a page was
// inserted to a visual tree before. It got removed later, but GC did not
// destroy its parent yet. To workaround this case always check for the parent
// of page visual and disconnect it, when necessary.
DocumentPageHost.DisconnectPageVisual(pageVisual);
_pageHost.PageVisual = pageVisual;
}
// Compute transform to be applied to the page visual. First take into account
// mirroring transform, if necessary. Apply also scaling transform.
pageSize = _documentPage.Size;
pageTransform = Transform.Identity;
// DocumentPage.Visual is always LeftToRight, so if the current
// FlowDirection is RightToLeft, need to unmirror the child visual.
if (FlowDirection == FlowDirection.RightToLeft)
{
pageTransform = new MatrixTransform(-1.0, 0.0, 0.0, 1.0, pageSize.Width, 0.0);
}
// Apply zooming
if (!DoubleUtil.IsOne(_pageZoom))
{
pageScaleTransform = new ScaleTransform(_pageZoom, _pageZoom);
if (pageTransform == Transform.Identity)
{
pageTransform = pageScaleTransform;
}
else
{
pageTransform = new MatrixTransform(pageTransform.Value * pageScaleTransform.Value);
}
pageSize = new Size(pageSize.Width * _pageZoom, pageSize.Height * _pageZoom);
}
// Apply stretch properties
pageZoom = Viewbox.ComputeScaleFactor(finalSize, pageSize, this.Stretch, this.StretchDirection);
if (!DoubleUtil.IsOne(pageZoom.Width) || !DoubleUtil.IsOne(pageZoom.Height))
{
pageScaleTransform = new ScaleTransform(pageZoom.Width, pageZoom.Height);
if (pageTransform == Transform.Identity)
{
pageTransform = pageScaleTransform;
}
else
{
pageTransform = new MatrixTransform(pageTransform.Value * pageScaleTransform.Value);
}
pageSize = new Size(pageSize.Width * pageZoom.Width, pageSize.Height * pageZoom.Height);
}
// Set offset and transform on the page host before Arrange
_pageHost.CachedOffset = new Point((finalSize.Width - pageSize.Width) / 2, (finalSize.Height - pageSize.Height) / 2);
_pageHost.RenderTransform = pageTransform;
// Arrange pagehost to original size of the page.
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, _documentPage.Size));
}
// Fire [....] notification if new page was connected.
if (_newPageConnected)
{
OnPageConnected();
}
// Transform for the page has been changed, need to notify TextView about the changes.
OnTransformChangedAsync();
}
else
{
if (_pageHost.PageVisual != _pageVisualClone)
{
// Remove existing visiual children.
_pageHost.PageVisual = _pageVisualClone;
// Size for the page host needs to be set to finalSize
// Use previous offset and transform
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, finalSize));
}
}
return base.ArrangeOverride(finalSize);
}
///
/// Derived class must implement to support Visual children. The method must return
/// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1.
///
protected override Visual GetVisualChild(int index)
{
if (index != 0 || _pageHost == null)
{
throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
}
return _pageHost;
}
///
/// Dispose the object.
///
protected void Dispose()
{
if (!_disposed)
{
_disposed = true;
// Cleanup all state associated with Paginator.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted -= new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged -= new PagesChangedEventHandler(HandlePagesChanged);
_documentPaginator.CancelAsync(this);
DisposeCurrentPage();
DisposeAsyncPage();
}
Invariant.Assert(_documentPage == null);
Invariant.Assert(_documentPageAsync == null);
_documentPaginator = null;
_textView = null;
}
}
///
/// Returns service objects associated with this control.
/// This method should be called by IServiceProvider.GetService implementation
/// for DocumentPageView or subclasses.
///
/// Specifies the type of service object to get.
protected object GetService(Type serviceType)
{
object service = null;
if (serviceType == null)
{
throw new ArgumentNullException("serviceType");
}
CheckDisposed();
// No service is available if the Content does not provide
// any services.
if (_documentPaginator != null && _documentPaginator is IServiceProvider)
{
// Following services are available:
// (1) TextView - wrapper for TextView exposed by the current page.
// (2) TextContainer - the service object is retrieved from DocumentPaginator.
if (serviceType == typeof(ITextView))
{
if (_textView == null)
{
ITextContainer tc = ((IServiceProvider)_documentPaginator).GetService(typeof(ITextContainer)) as ITextContainer;
if (tc != null)
{
_textView = new DocumentPageTextView(this, tc);
}
}
service = _textView;
}
else if (serviceType == typeof(TextContainer) || serviceType == typeof(ITextContainer))
{
service = ((IServiceProvider)_documentPaginator).GetService(serviceType);
}
}
return service;
}
///
/// Creates AutomationPeer (
protected override AutomationPeer OnCreateAutomationPeer()
{
return new DocumentPageViewAutomationPeer(this);
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Protected Properties
//
//-------------------------------------------------------------------
#region Protected Properties
///
/// Whether this DocumentPageView has been disposed.
///
protected bool IsDisposed
{
get { return _disposed; }
}
///
/// Derived classes override this property to enable the Visual code to enumerate
/// the Visual children. Derived classes need to return the number of children
/// from this method.
///
protected override int VisualChildrenCount
{
get { return _pageHost != null ? 1 : 0; }
}
#endregion Protected Properties
//-------------------------------------------------------------------
//
// Internal Methods
//
//--------------------------------------------------------------------
#region Internal Methods
///
/// Sets the zoom applied to the page being displayed.
///
/// Page zooom value.
internal void SetPageZoom(double pageZoom)
{
Invariant.Assert(!DoubleUtil.LessThanOrClose(pageZoom, 0d) && !Double.IsInfinity(pageZoom));
Invariant.Assert(!_disposed);
if (!DoubleUtil.AreClose(_pageZoom, pageZoom))
{
_pageZoom = pageZoom;
InvalidateMeasure();
}
}
///
/// Suspends page layout.
///
internal void SuspendLayout()
{
_suspendLayout = true;
_pageVisualClone = DuplicatePageVisual();
_visualCloneSize = this.DesiredSize;
}
///
/// Resumes page layout.
///
internal void ResumeLayout()
{
_suspendLayout = false;
_pageVisualClone = null;
InvalidateMeasure();
}
///
/// Duplicates the current page visual, if possible
///
internal void DuplicateVisual()
{
if (_documentPage != null && _pageVisualClone == null)
{
_pageVisualClone = DuplicatePageVisual();
_visualCloneSize = this.DesiredSize;
InvalidateArrange();
}
}
///
/// Clears the duplicated page visual, if one exists.
///
internal void RemoveDuplicateVisual()
{
if (_pageVisualClone != null)
{
_pageVisualClone = null;
InvalidateArrange();
}
}
#endregion Internal Methods
//-------------------------------------------------------------------
//
// Internal Properties
//
//--------------------------------------------------------------------
#region Internal Properties
///
/// Default is true. Controls whether we use asynchronous mode to
/// request the DocumentPage. In some cases, such as synchronous
/// printing, we don't want to wait for the asynchronous events.
///
internal bool UseAsynchronousGetPage
{
get { return _useAsynchronous; }
set { _useAsynchronous = value; }
}
///
/// The DocumentPage for the displayed page.
///
internal DocumentPage DocumentPageInternal
{
get { return _documentPage; }
}
#endregion Internal Properties
//--------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
///
/// Handles PageDestroyed event raised for the current DocumentPage.
///
/// Source of the event.
/// Not used.
private void HandlePageDestroyed(object sender, EventArgs e)
{
if (!_disposed)
{
InvalidateMeasure();
DisposeCurrentPage();
}
}
///
/// Handles PageDestroyed event raised for the cached async DocumentPage.
///
/// Source of the event.
/// Not used.
private void HandleAsyncPageDestroyed(object sender, EventArgs e)
{
if (!_disposed)
{
DisposeAsyncPage();
}
}
///
/// Handles GetPageCompleted event raised by the DocumentPaginator.
///
/// Source of the event.
/// Details about this event.
private void HandleGetPageCompleted(object sender, GetPageCompletedEventArgs e)
{
if (!_disposed && (e != null) && !e.Cancelled && e.Error == null)
{
if (e.PageNumber == this.PageNumber && e.UserState == this)
{
if (_documentPageAsync != null && _documentPageAsync != DocumentPage.Missing)
{
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
_documentPageAsync = e.DocumentPage;
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
if (_documentPageAsync != DocumentPage.Missing)
{
_documentPageAsync.PageDestroyed += new EventHandler(HandleAsyncPageDestroyed);
}
InvalidateMeasure();
}
// else; the page is not ours
}
}
///
/// Handles PagesChanged event raised by the DocumentPaginator.
///
/// Source of the event.
/// Details about this event.
private void HandlePagesChanged(object sender, PagesChangedEventArgs e)
{
if (!_disposed && (e != null))
{
if (this.PageNumber >= e.Start &&
(e.Count == int.MaxValue || this.PageNumber <= e.Start + e.Count))
{
OnPageContentChanged();
}
}
}
///
/// Async notification about transform changes for embedded page.
///
private void OnTransformChangedAsync()
{
Dispatcher.BeginInvoke(DispatcherPriority.Normal,
new DispatcherOperationCallback(OnTransformChanged), null);
}
///
/// Notification about transform changes for embedded page.
///
/// Not used.
/// Not used.
private object OnTransformChanged(object arg)
{
if (_textView != null && _documentPage != null)
{
_textView.OnTransformChanged();
}
return null;
}
///
/// Raises PageConnected event.
///
private void OnPageConnected()
{
_newPageConnected = false;
if (_textView != null)
{
_textView.OnPageConnected();
}
if (this.PageConnected != null && _documentPage != null)
{
this.PageConnected(this, EventArgs.Empty);
}
}
///
/// Raises PageDisconnected event.
///
private void OnPageDisconnected()
{
if (_textView != null)
{
_textView.OnPageDisconnected();
}
if (this.PageDisconnected != null)
{
this.PageDisconnected(this, EventArgs.Empty);
}
}
///
/// Responds to page content change.
///
private void OnPageContentChanged()
{
// Force remeasure which will cause to reget DocumentPage
InvalidateMeasure();
// Do cleanup for currently used page, because it gets replaced.
DisposeCurrentPage();
DisposeAsyncPage();
}
///
/// Disposes the current DocumentPage.
///
private void DisposeCurrentPage()
{
// Do cleanup for currently used page, because it gets replaced.
if (_documentPage != null)
{
// Remove visual for currently used page.
if (_pageHost != null)
{
_pageHost.PageVisual = null;
}
// Clear TextView & DocumentPage
if (_documentPage != DocumentPage.Missing)
{
_documentPage.PageDestroyed -= new EventHandler(HandlePageDestroyed);
}
if (_documentPage is IDisposable)
{
((IDisposable)_documentPage).Dispose();
}
_documentPage = null;
OnPageDisconnected();
}
}
///
/// Disposes pending async DocumentPage.
///
private void DisposeAsyncPage()
{
// Do cleanup for cached async page.
if (_documentPageAsync != null)
{
if (_documentPageAsync != DocumentPage.Missing)
{
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
if (_documentPageAsync is IDisposable)
{
((IDisposable)_documentPageAsync).Dispose();
}
_documentPageAsync = null;
}
}
///
/// Checks if the instance is already disposed.
///
private void CheckDisposed()
{
if (_disposed)
{
throw new ObjectDisposedException(typeof(DocumentPageView).ToString());
}
}
///
/// Check whether content needs to be reflowed.
///
/// True, if content needs to be reflowed.
private bool ShouldReflowContent()
{
bool shouldReflow = false;
DocumentViewerBase hostViewer;
if (DocumentViewerBase.GetIsMasterPage(this))
{
hostViewer = GetHostViewer();
if (hostViewer != null)
{
shouldReflow = hostViewer.IsMasterPageView(this);
}
}
return shouldReflow;
}
///
/// Retrieves DocumentViewerBase that hosts this view.
///
/// DocumentViewerBase that hosts this view.
private DocumentViewerBase GetHostViewer()
{
DocumentViewerBase hostViewer = null;
Visual visualParent;
// First do quick check for TemplatedParent. It will cover good
// amount of cases, because static viewers will have their
// DocumentPageViews defined in the style.
// If quick check does not work, do a visual tree walk.
if (this.TemplatedParent is DocumentViewerBase)
{
hostViewer = (DocumentViewerBase)this.TemplatedParent;
}
else
{
// Check if hosted by DocumentViewerBase.
visualParent = VisualTreeHelper.GetParent(this) as Visual;
while (visualParent != null)
{
if (visualParent is DocumentViewerBase)
{
hostViewer = (DocumentViewerBase)visualParent;
break;
}
visualParent = VisualTreeHelper.GetParent(visualParent) as Visual;
}
}
return hostViewer;
}
///
/// The PageNumber has changed and needs to be updated.
///
private static void OnPageNumberChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Invariant.Assert(d != null && d is DocumentPageView);
((DocumentPageView)d).OnPageContentChanged();
}
///
/// Duplicates content of the PageVisual.
///
private DrawingVisual DuplicatePageVisual()
{
DrawingVisual drawingVisual = null;
if (_pageHost != null && _pageHost.PageVisual != null && _documentPage.Size != Size.Empty)
{
const double maxWidth = 4096.0;
const double maxHeight = maxWidth;
Rect pageVisualRect = new Rect(_documentPage.Size);
pageVisualRect.Width = Math.Min(pageVisualRect.Width, maxWidth);
pageVisualRect.Height = Math.Min(pageVisualRect.Height, maxHeight);
drawingVisual = new DrawingVisual();
try
{
if(pageVisualRect.Width > 1.0 && pageVisualRect.Height > 1.0)
{
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap((int)pageVisualRect.Width, (int)pageVisualRect.Height, 96.0, 96.0, PixelFormats.Pbgra32);
renderTargetBitmap.Render(_pageHost.PageVisual);
ImageBrush imageBrush = new ImageBrush(renderTargetBitmap);
drawingVisual.Opacity = 0.50;
using (DrawingContext dc = drawingVisual.RenderOpen())
{
dc.DrawRectangle(imageBrush, null, pageVisualRect);
}
}
}
catch(System.OverflowException)
{
// Ignore overflow exception - caused by render target creation not possible under current memory conditions.
}
}
return drawingVisual;
}
#endregion Private Methods
//--------------------------------------------------------------------
//
// Private Fields
//
//-------------------------------------------------------------------
#region Private Fields
private DocumentPaginator _documentPaginator;
private double _pageZoom;
private DocumentPage _documentPage;
private DocumentPage _documentPageAsync;
private DocumentPageTextView _textView;
private DocumentPageHost _pageHost;
private Visual _pageVisualClone;
private Size _visualCloneSize;
private bool _useAsynchronous = true;
private bool _suspendLayout;
private bool _disposed;
private bool _newPageConnected;
#endregion Private Fields
//-------------------------------------------------------------------
//
// IServiceProvider Members
//
//-------------------------------------------------------------------
#region IServiceProvider Members
///
/// Returns service objects associated with this control.
///
/// Specifies the type of service object to get.
object IServiceProvider.GetService(Type serviceType)
{
return this.GetService(serviceType);
}
#endregion IServiceProvider Members
//--------------------------------------------------------------------
//
// IDisposable Members
//
//-------------------------------------------------------------------
#region IDisposable Members
///
/// Dispose the object.
///
void IDisposable.Dispose()
{
this.Dispose();
}
#endregion IDisposable Members
}
}
// 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: DocumentPageView.cs
//
// Description: Provides a view port for a page of content for a DocumentPage.
//
//---------------------------------------------------------------------------
using System.Windows.Automation; // AutomationPattern
using System.Windows.Automation.Peers; // AutomationPeer
using System.Windows.Controls; // StretchDirection
using System.Windows.Controls.Primitives; // DocumentViewerBase
using System.Windows.Documents; // DocumentPaginator
using System.Windows.Media; // Visual
using System.Windows.Media.Imaging; // RenderTargetBitmap
using System.Windows.Threading; // Dispatcher
using MS.Internal; // Invariant
using MS.Internal.Documents; // DocumentPageHost, DocumentPageTextView
using MS.Internal.Automation; // TextAdaptor
using MS.Internal.KnownBoxes; // BooleanBoxes
namespace System.Windows.Controls.Primitives
{
///
/// Provides a view port for a page of content for a DocumentPage.
///
public class DocumentPageView : FrameworkElement, IServiceProvider, IDisposable
{
//-------------------------------------------------------------------
//
// Constructors
//
//-------------------------------------------------------------------
#region Constructors
///
/// Create an instance of a DocumentPageView.
///
///
/// This does basic initialization of the DocumentPageView. All subclasses
/// must call the base constructor to perform this initialization.
///
public DocumentPageView() : base()
{
_pageZoom = 1.0;
}
///
/// Static ctor. Initializes property metadata.
///
static DocumentPageView()
{
ClipToBoundsProperty.OverrideMetadata(typeof(DocumentPageView), new PropertyMetadata(BooleanBoxes.TrueBox));
}
#endregion
//--------------------------------------------------------------------
//
// Public Properties
//
//-------------------------------------------------------------------
#region Public Properties
///
/// The Paginator from which this DocumentPageView retrieves pages.
///
public DocumentPaginator DocumentPaginator
{
get { return _documentPaginator; }
set
{
CheckDisposed();
if (_documentPaginator != value)
{
// Cleanup all state associated with old Paginator.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted -= new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged -= new PagesChangedEventHandler(HandlePagesChanged);
DisposeCurrentPage();
DisposeAsyncPage();
}
Invariant.Assert(_documentPage == null);
Invariant.Assert(_documentPageAsync == null);
_documentPaginator = value;
_textView = null;
// Register for events on new Paginator and invalidate
// measure to force content update.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted += new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged += new PagesChangedEventHandler(HandlePagesChanged);
}
InvalidateMeasure();
}
}
}
///
/// The DocumentPage for the displayed page.
///
public DocumentPage DocumentPage
{
get { return (_documentPage == null) ? DocumentPage.Missing : _documentPage; }
}
///
/// The page number displayed; no content is displayed if this number is negative.
/// PageNumber is zero-based.
///
public int PageNumber
{
get { return (int) GetValue(PageNumberProperty); }
set { SetValue(PageNumberProperty, value); }
}
///
/// Controls the stretching behavior for the page.
///
public Stretch Stretch
{
get { return (Stretch)GetValue(StretchProperty); }
set { SetValue(StretchProperty, value); }
}
///
/// Specifies the directions in which page may be stretched.
///
public StretchDirection StretchDirection
{
get { return (StretchDirection)GetValue(StretchDirectionProperty); }
set { SetValue(StretchDirectionProperty, value); }
}
#region Public Dynamic Properties
///
///
public static readonly DependencyProperty PageNumberProperty =
DependencyProperty.Register(
"PageNumber",
typeof(int),
typeof(DocumentPageView),
new FrameworkPropertyMetadata(
0,
FrameworkPropertyMetadataOptions.AffectsMeasure,
new PropertyChangedCallback(OnPageNumberChanged)));
///
///
public static readonly DependencyProperty StretchProperty =
Viewbox.StretchProperty.AddOwner(
typeof(DocumentPageView),
new FrameworkPropertyMetadata(
Stretch.Uniform,
FrameworkPropertyMetadataOptions.AffectsMeasure));
///
///
public static readonly DependencyProperty StretchDirectionProperty =
Viewbox.StretchDirectionProperty.AddOwner(
typeof(DocumentPageView),
new FrameworkPropertyMetadata(
StretchDirection.DownOnly,
FrameworkPropertyMetadataOptions.AffectsMeasure));
#endregion Public Dynamic Properties
#endregion Public Properties
//--------------------------------------------------------------------
//
// Public Events
//
//--------------------------------------------------------------------
#region Public Events
///
/// Fired after a DocumentPage.Visual is connected.
///
public event EventHandler PageConnected;
///
/// Fired after a DocumentPage.Visual is disconnected.
///
public event EventHandler PageDisconnected;
#endregion Public Events
//-------------------------------------------------------------------
//
// Protected Methods
//
//--------------------------------------------------------------------
#region Protected Methods
///
/// Content measurement.
///
/// Available size that parent can give to the child. This is soft constraint.
/// The DocumentPageView's desired size.
protected override sealed Size MeasureOverride(Size availableSize)
{
Size newPageSize, pageZoom;
Size pageSize;
Size desiredSize = new Size(); // If no page is available, return (0,0) as size.
CheckDisposed();
if (_suspendLayout)
{
desiredSize = this.DesiredSize;
}
else if (_documentPaginator != null)
{
// Reflow content if needed.
if (ShouldReflowContent())
{
// Reflow is disabled when dealing with infinite size in both directions.
// If only one dimention is infinte, calculate value based on PageSize of the
// document and Stretching properties.
if (!Double.IsInfinity(availableSize.Width) || !Double.IsInfinity(availableSize.Height))
{
pageSize = _documentPaginator.PageSize;
if (Double.IsInfinity(availableSize.Width))
{
newPageSize = new Size();
newPageSize.Height = availableSize.Height / _pageZoom;
newPageSize.Width = newPageSize.Height * (pageSize.Width / pageSize.Height); // Keep aspect ratio.
}
else if (Double.IsInfinity(availableSize.Height))
{
newPageSize = new Size();
newPageSize.Width = availableSize.Width / _pageZoom;
newPageSize.Height = newPageSize.Width * (pageSize.Height / pageSize.Width); // Keep aspect ratio.
}
else
{
newPageSize = new Size(availableSize.Width / _pageZoom, availableSize.Height / _pageZoom);
}
if (!DoubleUtil.AreClose(pageSize, newPageSize))
{
_documentPaginator.PageSize = newPageSize;
}
}
}
// If the main page or pending async page are not available yet,
// asynchronously request new page from Paginator.
if (_documentPage == null && _documentPageAsync == null)
{
if (PageNumber >= 0)
{
if (_useAsynchronous)
{
_documentPaginator.GetPageAsync(PageNumber, this);
}
else
{
_documentPageAsync = _documentPaginator.GetPage(PageNumber);
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
}
}
else
{
_documentPage = DocumentPage.Missing;
}
}
// If pending async page is available, discard the main page and
// set _documentPage to _documentPageAsync.
if (_documentPageAsync != null)
{
// Do cleanup for currently used page, because it gets replaced.
DisposeCurrentPage();
// DisposeCurrentPage raises PageDisposed and DocumentPage.PageDestroyed events.
// Handlers for those events may dispose _documentPageAsync. Treat this situation
// as missing page.
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
if (_pageVisualClone != null)
{
RemoveDuplicateVisual();
}
// Replace the main page with cached async page.
_documentPage = _documentPageAsync;
if (_documentPage != DocumentPage.Missing)
{
_documentPage.PageDestroyed += new EventHandler(HandlePageDestroyed);
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
_documentPageAsync = null;
// Set a flag that will indicate that a PageConnected must be fired in
// ArrangeOverride
_newPageConnected = true;
}
// If page is available, return its size as desired size.
if (_documentPage != null && _documentPage != DocumentPage.Missing)
{
pageSize = new Size(_documentPage.Size.Width * _pageZoom, _documentPage.Size.Height * _pageZoom);
pageZoom = Viewbox.ComputeScaleFactor(availableSize, pageSize, this.Stretch, this.StretchDirection);
desiredSize = new Size(pageSize.Width * pageZoom.Width, pageSize.Height * pageZoom.Height);
}
if (_pageVisualClone != null)
{
desiredSize = _visualCloneSize;
}
}
return desiredSize;
}
///
/// Content arrangement.
///
/// The final size that element should use to arrange itself and its children.
protected override sealed Size ArrangeOverride(Size finalSize)
{
Transform pageTransform;
ScaleTransform pageScaleTransform;
Visual pageVisual;
Size pageSize, pageZoom;
CheckDisposed();
if (_pageVisualClone == null)
{
if (_pageHost == null)
{
_pageHost = new DocumentPageHost();
this.AddVisualChild(_pageHost);
}
Invariant.Assert(_pageHost != null);
pageVisual = (_documentPage == null) ? null : _documentPage.Visual;
if (pageVisual == null)
{
// Remove existing visiual children.
_pageHost.PageVisual = null;
// Reset offset and transform on the page host before Arrange
_pageHost.CachedOffset = new Point();
_pageHost.RenderTransform = null;
// Size for the page host needs to be set to finalSize
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, finalSize));
}
else
{
// Add visual representing the page contents. For performance reasons
// first check if it is already insered there.
if (_pageHost.PageVisual != pageVisual)
{
// There might be a case where a visual associated with a page was
// inserted to a visual tree before. It got removed later, but GC did not
// destroy its parent yet. To workaround this case always check for the parent
// of page visual and disconnect it, when necessary.
DocumentPageHost.DisconnectPageVisual(pageVisual);
_pageHost.PageVisual = pageVisual;
}
// Compute transform to be applied to the page visual. First take into account
// mirroring transform, if necessary. Apply also scaling transform.
pageSize = _documentPage.Size;
pageTransform = Transform.Identity;
// DocumentPage.Visual is always LeftToRight, so if the current
// FlowDirection is RightToLeft, need to unmirror the child visual.
if (FlowDirection == FlowDirection.RightToLeft)
{
pageTransform = new MatrixTransform(-1.0, 0.0, 0.0, 1.0, pageSize.Width, 0.0);
}
// Apply zooming
if (!DoubleUtil.IsOne(_pageZoom))
{
pageScaleTransform = new ScaleTransform(_pageZoom, _pageZoom);
if (pageTransform == Transform.Identity)
{
pageTransform = pageScaleTransform;
}
else
{
pageTransform = new MatrixTransform(pageTransform.Value * pageScaleTransform.Value);
}
pageSize = new Size(pageSize.Width * _pageZoom, pageSize.Height * _pageZoom);
}
// Apply stretch properties
pageZoom = Viewbox.ComputeScaleFactor(finalSize, pageSize, this.Stretch, this.StretchDirection);
if (!DoubleUtil.IsOne(pageZoom.Width) || !DoubleUtil.IsOne(pageZoom.Height))
{
pageScaleTransform = new ScaleTransform(pageZoom.Width, pageZoom.Height);
if (pageTransform == Transform.Identity)
{
pageTransform = pageScaleTransform;
}
else
{
pageTransform = new MatrixTransform(pageTransform.Value * pageScaleTransform.Value);
}
pageSize = new Size(pageSize.Width * pageZoom.Width, pageSize.Height * pageZoom.Height);
}
// Set offset and transform on the page host before Arrange
_pageHost.CachedOffset = new Point((finalSize.Width - pageSize.Width) / 2, (finalSize.Height - pageSize.Height) / 2);
_pageHost.RenderTransform = pageTransform;
// Arrange pagehost to original size of the page.
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, _documentPage.Size));
}
// Fire [....] notification if new page was connected.
if (_newPageConnected)
{
OnPageConnected();
}
// Transform for the page has been changed, need to notify TextView about the changes.
OnTransformChangedAsync();
}
else
{
if (_pageHost.PageVisual != _pageVisualClone)
{
// Remove existing visiual children.
_pageHost.PageVisual = _pageVisualClone;
// Size for the page host needs to be set to finalSize
// Use previous offset and transform
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, finalSize));
}
}
return base.ArrangeOverride(finalSize);
}
///
/// Derived class must implement to support Visual children. The method must return
/// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1.
///
protected override Visual GetVisualChild(int index)
{
if (index != 0 || _pageHost == null)
{
throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
}
return _pageHost;
}
///
/// Dispose the object.
///
protected void Dispose()
{
if (!_disposed)
{
_disposed = true;
// Cleanup all state associated with Paginator.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted -= new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged -= new PagesChangedEventHandler(HandlePagesChanged);
_documentPaginator.CancelAsync(this);
DisposeCurrentPage();
DisposeAsyncPage();
}
Invariant.Assert(_documentPage == null);
Invariant.Assert(_documentPageAsync == null);
_documentPaginator = null;
_textView = null;
}
}
///
/// Returns service objects associated with this control.
/// This method should be called by IServiceProvider.GetService implementation
/// for DocumentPageView or subclasses.
///
/// Specifies the type of service object to get.
protected object GetService(Type serviceType)
{
object service = null;
if (serviceType == null)
{
throw new ArgumentNullException("serviceType");
}
CheckDisposed();
// No service is available if the Content does not provide
// any services.
if (_documentPaginator != null && _documentPaginator is IServiceProvider)
{
// Following services are available:
// (1) TextView - wrapper for TextView exposed by the current page.
// (2) TextContainer - the service object is retrieved from DocumentPaginator.
if (serviceType == typeof(ITextView))
{
if (_textView == null)
{
ITextContainer tc = ((IServiceProvider)_documentPaginator).GetService(typeof(ITextContainer)) as ITextContainer;
if (tc != null)
{
_textView = new DocumentPageTextView(this, tc);
}
}
service = _textView;
}
else if (serviceType == typeof(TextContainer) || serviceType == typeof(ITextContainer))
{
service = ((IServiceProvider)_documentPaginator).GetService(serviceType);
}
}
return service;
}
///
/// Creates AutomationPeer (
protected override AutomationPeer OnCreateAutomationPeer()
{
return new DocumentPageViewAutomationPeer(this);
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Protected Properties
//
//-------------------------------------------------------------------
#region Protected Properties
///
/// Whether this DocumentPageView has been disposed.
///
protected bool IsDisposed
{
get { return _disposed; }
}
///
/// Derived classes override this property to enable the Visual code to enumerate
/// the Visual children. Derived classes need to return the number of children
/// from this method.
///
protected override int VisualChildrenCount
{
get { return _pageHost != null ? 1 : 0; }
}
#endregion Protected Properties
//-------------------------------------------------------------------
//
// Internal Methods
//
//--------------------------------------------------------------------
#region Internal Methods
///
/// Sets the zoom applied to the page being displayed.
///
/// Page zooom value.
internal void SetPageZoom(double pageZoom)
{
Invariant.Assert(!DoubleUtil.LessThanOrClose(pageZoom, 0d) && !Double.IsInfinity(pageZoom));
Invariant.Assert(!_disposed);
if (!DoubleUtil.AreClose(_pageZoom, pageZoom))
{
_pageZoom = pageZoom;
InvalidateMeasure();
}
}
///
/// Suspends page layout.
///
internal void SuspendLayout()
{
_suspendLayout = true;
_pageVisualClone = DuplicatePageVisual();
_visualCloneSize = this.DesiredSize;
}
///
/// Resumes page layout.
///
internal void ResumeLayout()
{
_suspendLayout = false;
_pageVisualClone = null;
InvalidateMeasure();
}
///
/// Duplicates the current page visual, if possible
///
internal void DuplicateVisual()
{
if (_documentPage != null && _pageVisualClone == null)
{
_pageVisualClone = DuplicatePageVisual();
_visualCloneSize = this.DesiredSize;
InvalidateArrange();
}
}
///
/// Clears the duplicated page visual, if one exists.
///
internal void RemoveDuplicateVisual()
{
if (_pageVisualClone != null)
{
_pageVisualClone = null;
InvalidateArrange();
}
}
#endregion Internal Methods
//-------------------------------------------------------------------
//
// Internal Properties
//
//--------------------------------------------------------------------
#region Internal Properties
///
/// Default is true. Controls whether we use asynchronous mode to
/// request the DocumentPage. In some cases, such as synchronous
/// printing, we don't want to wait for the asynchronous events.
///
internal bool UseAsynchronousGetPage
{
get { return _useAsynchronous; }
set { _useAsynchronous = value; }
}
///
/// The DocumentPage for the displayed page.
///
internal DocumentPage DocumentPageInternal
{
get { return _documentPage; }
}
#endregion Internal Properties
//--------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
///
/// Handles PageDestroyed event raised for the current DocumentPage.
///
/// Source of the event.
/// Not used.
private void HandlePageDestroyed(object sender, EventArgs e)
{
if (!_disposed)
{
InvalidateMeasure();
DisposeCurrentPage();
}
}
///
/// Handles PageDestroyed event raised for the cached async DocumentPage.
///
/// Source of the event.
/// Not used.
private void HandleAsyncPageDestroyed(object sender, EventArgs e)
{
if (!_disposed)
{
DisposeAsyncPage();
}
}
///
/// Handles GetPageCompleted event raised by the DocumentPaginator.
///
/// Source of the event.
/// Details about this event.
private void HandleGetPageCompleted(object sender, GetPageCompletedEventArgs e)
{
if (!_disposed && (e != null) && !e.Cancelled && e.Error == null)
{
if (e.PageNumber == this.PageNumber && e.UserState == this)
{
if (_documentPageAsync != null && _documentPageAsync != DocumentPage.Missing)
{
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
_documentPageAsync = e.DocumentPage;
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
if (_documentPageAsync != DocumentPage.Missing)
{
_documentPageAsync.PageDestroyed += new EventHandler(HandleAsyncPageDestroyed);
}
InvalidateMeasure();
}
// else; the page is not ours
}
}
///
/// Handles PagesChanged event raised by the DocumentPaginator.
///
/// Source of the event.
/// Details about this event.
private void HandlePagesChanged(object sender, PagesChangedEventArgs e)
{
if (!_disposed && (e != null))
{
if (this.PageNumber >= e.Start &&
(e.Count == int.MaxValue || this.PageNumber <= e.Start + e.Count))
{
OnPageContentChanged();
}
}
}
///
/// Async notification about transform changes for embedded page.
///
private void OnTransformChangedAsync()
{
Dispatcher.BeginInvoke(DispatcherPriority.Normal,
new DispatcherOperationCallback(OnTransformChanged), null);
}
///
/// Notification about transform changes for embedded page.
///
/// Not used.
/// Not used.
private object OnTransformChanged(object arg)
{
if (_textView != null && _documentPage != null)
{
_textView.OnTransformChanged();
}
return null;
}
///
/// Raises PageConnected event.
///
private void OnPageConnected()
{
_newPageConnected = false;
if (_textView != null)
{
_textView.OnPageConnected();
}
if (this.PageConnected != null && _documentPage != null)
{
this.PageConnected(this, EventArgs.Empty);
}
}
///
/// Raises PageDisconnected event.
///
private void OnPageDisconnected()
{
if (_textView != null)
{
_textView.OnPageDisconnected();
}
if (this.PageDisconnected != null)
{
this.PageDisconnected(this, EventArgs.Empty);
}
}
///
/// Responds to page content change.
///
private void OnPageContentChanged()
{
// Force remeasure which will cause to reget DocumentPage
InvalidateMeasure();
// Do cleanup for currently used page, because it gets replaced.
DisposeCurrentPage();
DisposeAsyncPage();
}
///
/// Disposes the current DocumentPage.
///
private void DisposeCurrentPage()
{
// Do cleanup for currently used page, because it gets replaced.
if (_documentPage != null)
{
// Remove visual for currently used page.
if (_pageHost != null)
{
_pageHost.PageVisual = null;
}
// Clear TextView & DocumentPage
if (_documentPage != DocumentPage.Missing)
{
_documentPage.PageDestroyed -= new EventHandler(HandlePageDestroyed);
}
if (_documentPage is IDisposable)
{
((IDisposable)_documentPage).Dispose();
}
_documentPage = null;
OnPageDisconnected();
}
}
///
/// Disposes pending async DocumentPage.
///
private void DisposeAsyncPage()
{
// Do cleanup for cached async page.
if (_documentPageAsync != null)
{
if (_documentPageAsync != DocumentPage.Missing)
{
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
if (_documentPageAsync is IDisposable)
{
((IDisposable)_documentPageAsync).Dispose();
}
_documentPageAsync = null;
}
}
///
/// Checks if the instance is already disposed.
///
private void CheckDisposed()
{
if (_disposed)
{
throw new ObjectDisposedException(typeof(DocumentPageView).ToString());
}
}
///
/// Check whether content needs to be reflowed.
///
/// True, if content needs to be reflowed.
private bool ShouldReflowContent()
{
bool shouldReflow = false;
DocumentViewerBase hostViewer;
if (DocumentViewerBase.GetIsMasterPage(this))
{
hostViewer = GetHostViewer();
if (hostViewer != null)
{
shouldReflow = hostViewer.IsMasterPageView(this);
}
}
return shouldReflow;
}
///
/// Retrieves DocumentViewerBase that hosts this view.
///
/// DocumentViewerBase that hosts this view.
private DocumentViewerBase GetHostViewer()
{
DocumentViewerBase hostViewer = null;
Visual visualParent;
// First do quick check for TemplatedParent. It will cover good
// amount of cases, because static viewers will have their
// DocumentPageViews defined in the style.
// If quick check does not work, do a visual tree walk.
if (this.TemplatedParent is DocumentViewerBase)
{
hostViewer = (DocumentViewerBase)this.TemplatedParent;
}
else
{
// Check if hosted by DocumentViewerBase.
visualParent = VisualTreeHelper.GetParent(this) as Visual;
while (visualParent != null)
{
if (visualParent is DocumentViewerBase)
{
hostViewer = (DocumentViewerBase)visualParent;
break;
}
visualParent = VisualTreeHelper.GetParent(visualParent) as Visual;
}
}
return hostViewer;
}
///
/// The PageNumber has changed and needs to be updated.
///
private static void OnPageNumberChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Invariant.Assert(d != null && d is DocumentPageView);
((DocumentPageView)d).OnPageContentChanged();
}
///
/// Duplicates content of the PageVisual.
///
private DrawingVisual DuplicatePageVisual()
{
DrawingVisual drawingVisual = null;
if (_pageHost != null && _pageHost.PageVisual != null && _documentPage.Size != Size.Empty)
{
const double maxWidth = 4096.0;
const double maxHeight = maxWidth;
Rect pageVisualRect = new Rect(_documentPage.Size);
pageVisualRect.Width = Math.Min(pageVisualRect.Width, maxWidth);
pageVisualRect.Height = Math.Min(pageVisualRect.Height, maxHeight);
drawingVisual = new DrawingVisual();
try
{
if(pageVisualRect.Width > 1.0 && pageVisualRect.Height > 1.0)
{
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap((int)pageVisualRect.Width, (int)pageVisualRect.Height, 96.0, 96.0, PixelFormats.Pbgra32);
renderTargetBitmap.Render(_pageHost.PageVisual);
ImageBrush imageBrush = new ImageBrush(renderTargetBitmap);
drawingVisual.Opacity = 0.50;
using (DrawingContext dc = drawingVisual.RenderOpen())
{
dc.DrawRectangle(imageBrush, null, pageVisualRect);
}
}
}
catch(System.OverflowException)
{
// Ignore overflow exception - caused by render target creation not possible under current memory conditions.
}
}
return drawingVisual;
}
#endregion Private Methods
//--------------------------------------------------------------------
//
// Private Fields
//
//-------------------------------------------------------------------
#region Private Fields
private DocumentPaginator _documentPaginator;
private double _pageZoom;
private DocumentPage _documentPage;
private DocumentPage _documentPageAsync;
private DocumentPageTextView _textView;
private DocumentPageHost _pageHost;
private Visual _pageVisualClone;
private Size _visualCloneSize;
private bool _useAsynchronous = true;
private bool _suspendLayout;
private bool _disposed;
private bool _newPageConnected;
#endregion Private Fields
//-------------------------------------------------------------------
//
// IServiceProvider Members
//
//-------------------------------------------------------------------
#region IServiceProvider Members
///
/// Returns service objects associated with this control.
///
/// Specifies the type of service object to get.
object IServiceProvider.GetService(Type serviceType)
{
return this.GetService(serviceType);
}
#endregion IServiceProvider Members
//--------------------------------------------------------------------
//
// IDisposable Members
//
//-------------------------------------------------------------------
#region IDisposable Members
///
/// Dispose the object.
///
void IDisposable.Dispose()
{
this.Dispose();
}
#endregion IDisposable Members
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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- ToolStripItemImageRenderEventArgs.cs
- XmlSchemaValidationException.cs
- UserInitiatedNavigationPermission.cs
- PersistenceTypeAttribute.cs
- DataBoundControlAdapter.cs
- SqlMetaData.cs
- ObfuscateAssemblyAttribute.cs
- ValidationHelper.cs
- CacheMode.cs
- SqlProfileProvider.cs
- FileVersionInfo.cs
- mediaclock.cs
- DBSchemaTable.cs
- CheckBoxPopupAdapter.cs
- FormView.cs
- KeyInstance.cs
- RawUIStateInputReport.cs
- AttributeUsageAttribute.cs
- HttpServerChannel.cs
- UdpDuplexChannel.cs
- Registry.cs
- SafeLocalMemHandle.cs
- SelectionListComponentEditor.cs