Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / MS / Internal / documents / IFlowDocumentViewer.cs / 1 / IFlowDocumentViewer.cs
//----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System; // Object, IServiceProvider
using System.Windows; // Rect, Point
using System.Windows.Documents; // ITextSelection
using System.Windows.Controls; // FlowDocumentScrollViewer
using System.Windows.Controls.Primitives; // IScrollInfo
using System.Windows.Input; // UICommand
using System.Windows.Threading; // Dispatcher
using MS.Internal.KnownBoxes; // BooleanBoxes
namespace MS.Internal.Documents
{
///
/// An IFlowDocumentViewer is used for FlowDocumentReader in order to simplify its
/// view switching logic.
///
internal interface IFlowDocumentViewer
{
///
/// Navigate to the previous page.
///
void PreviousPage();
///
/// Navigate to the next page.
///
void NextPage();
///
/// Navigate to the first page.
///
void FirstPage();
///
/// Navigate to the last page.
///
void LastPage();
///
/// Print the document.
///
void Print();
///
/// Cancel printing of the document.
///
void CancelPrint();
///
/// Show find result.
///
void ShowFindResult(ITextRange findResult);
///
/// Whether can navigate to specific page number.
///
/// Requested page number.
/// Whether navigation is possible or not.
bool CanGoToPage(int pageNumber);
///
/// Navigate to requested page number.
///
/// Requested page number.
void GoToPage(int pageNumber);
///
/// Associate the viewer with new document.
///
/// New document.
void SetDocument(FlowDocument document);
///
/// The content position of the document showed in the control.
///
ContentPosition ContentPosition { get; set; }
///
/// The Selection of TextEditor
///
ITextSelection TextSelection { get; set; }
///
/// Whether can navigate to the previous page.
///
bool CanGoToPreviousPage { get; }
///
/// Whether can navigate to the next page.
///
bool CanGoToNextPage { get; }
///
/// The one-based page number of the page being displayed.
/// If there is no content, this value will be 0.
///
int PageNumber { get; }
///
/// The number of pages currently available for viewing.
///
int PageCount { get; }
///
/// Fired when the current page number has been changed.
///
event EventHandler PageNumberChanged;
///
/// Fired when the page count has been changed.
///
event EventHandler PageCountChanged;
///
/// Fired when the print has been started.
///
event EventHandler PrintStarted;
///
/// Fired when the print has been completed.
///
event EventHandler PrintCompleted;
}
///
/// This class is an internal subclass of the FlowDocumentScrollViewer that provides
/// IFlowDocumentViewer interface used by FlowDocumentReader.
///
internal class ReaderScrollViewer : FlowDocumentScrollViewer, IFlowDocumentViewer
{
//-------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
///
/// Called when print has been completed.
///
protected override void OnPrintCompleted()
{
base.OnPrintCompleted();
if (_printCompleted != null)
{
_printCompleted(this, EventArgs.Empty);
}
}
///
/// Handler for the Print command.
///
protected override void OnPrintCommand()
{
base.OnPrintCommand();
if (_printStarted != null && IsPrinting)
{
_printStarted(this, EventArgs.Empty);
}
}
///
/// Notification that a specified property has been changed.
///
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
// PageCount and PageNumber are dependent on Document property value.
// Hence need to raise changed events when Document property is changing.
if (e.Property == DocumentProperty)
{
if (_pageNumberChanged != null)
{
_pageNumberChanged(this, EventArgs.Empty);
}
if (_pageCountChanged != null)
{
_pageCountChanged(this, EventArgs.Empty);
}
}
}
#endregion Protected Methods
//--------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
///
/// Returns whether TextSelection is valid for document - As this is flow document, we require the text containers to be equal
/// to allow it as a valid selection.
///
private bool IsValidTextSelectionForDocument(ITextSelection textSelection, FlowDocument flowDocument)
{
if(textSelection.Start != null && textSelection.Start.TextContainer == flowDocument.StructuralCache.TextContainer)
{
return true;
}
return false;
}
///
/// Set TextSelection.
///
private object SetTextSelection(object arg)
{
ITextSelection newTextSelection = arg as ITextSelection;
if (newTextSelection != null && Document != null && IsValidTextSelectionForDocument(newTextSelection, Document))
{
ITextSelection textSelection = Document.StructuralCache.TextContainer.TextSelection;
if (textSelection != null)
{
textSelection.SetCaretToPosition(newTextSelection.AnchorPosition, newTextSelection.MovingPosition.LogicalDirection, true, true);
textSelection.ExtendToPosition(newTextSelection.MovingPosition);
}
}
return null;
}
#endregion Private Methods
//--------------------------------------------------------------------
//
// Private Fields
//
//--------------------------------------------------------------------
#region Private Fields
private EventHandler _pageNumberChanged;
private EventHandler _pageCountChanged;
private EventHandler _printCompleted;
private EventHandler _printStarted;
#endregion Private Fields
//-------------------------------------------------------------------
//
// IFlowDocumentViewer Members
//
//--------------------------------------------------------------------
#region IFlowDocumentViewer Members
///
///
void IFlowDocumentViewer.PreviousPage()
{
if (ScrollViewer != null)
{
ScrollViewer.PageUp();
}
}
///
///
void IFlowDocumentViewer.NextPage()
{
if (ScrollViewer != null)
{
ScrollViewer.PageDown();
}
}
///
///
void IFlowDocumentViewer.FirstPage()
{
if (ScrollViewer != null)
{
ScrollViewer.ScrollToHome();
}
}
///
///
void IFlowDocumentViewer.LastPage()
{
if (ScrollViewer != null)
{
ScrollViewer.ScrollToEnd();
}
}
///
///
void IFlowDocumentViewer.Print()
{
OnPrintCommand();
}
///
///
void IFlowDocumentViewer.CancelPrint()
{
OnCancelPrintCommand();
}
///
///
void IFlowDocumentViewer.ShowFindResult(ITextRange findResult)
{
// If we found something, TextEditor will bring the selection into view.
// It is possible, because RenderScope is inside ScrollViewer.
}
///
///
bool IFlowDocumentViewer.CanGoToPage(int pageNumber)
{
// FlowDocumentScrollViewer is always a 1 page document, so its page number will always be 1
return (pageNumber == 1);
}
///
///
void IFlowDocumentViewer.GoToPage(int pageNumber)
{
if (pageNumber == 1 && ScrollViewer != null)
{
ScrollViewer.ScrollToHome();
}
}
///
///
void IFlowDocumentViewer.SetDocument(FlowDocument document)
{
Document = document;
}
///
///
ContentPosition IFlowDocumentViewer.ContentPosition
{
get
{
return this.ContentPosition;
}
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(BringContentPositionIntoView), value);
}
}
}
///
///
ITextSelection IFlowDocumentViewer.TextSelection
{
get
{
return this.Selection;
}
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(SetTextSelection), value);
}
}
}
///
///
bool IFlowDocumentViewer.CanGoToPreviousPage
{
get { return false; }
}
///
///
bool IFlowDocumentViewer.CanGoToNextPage
{
get { return false; }
}
///
///
int IFlowDocumentViewer.PageNumber
{
get { return (Document != null) ? 1 : 0; }
}
///
///
int IFlowDocumentViewer.PageCount
{
get { return (Document != null) ? 1 : 0; }
}
///
///
event EventHandler IFlowDocumentViewer.PageNumberChanged
{
add { _pageNumberChanged += value; }
remove { _pageNumberChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PageCountChanged
{
add { _pageCountChanged += value; }
remove { _pageCountChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintStarted
{
add { _printStarted += value; }
remove { _printStarted -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintCompleted
{
add { _printCompleted += value; }
remove { _printCompleted -= value; }
}
#endregion IFlowDocumentViewer Members
}
///
/// This class is an internal subclass of the FlowDocumentPageViewer that provides
/// IFlowDocumentViewer interface used by FlowDocumentReader.
///
internal class ReaderPageViewer : FlowDocumentPageViewer, IFlowDocumentViewer
{
//-------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
///
/// Called when print has been completed.
///
protected override void OnPrintCompleted()
{
base.OnPrintCompleted();
if (_printCompleted != null)
{
_printCompleted(this, EventArgs.Empty);
}
}
///
/// Handler for the Print command.
///
protected override void OnPrintCommand()
{
base.OnPrintCommand();
if (_printStarted != null && IsPrinting)
{
_printStarted(this, EventArgs.Empty);
}
}
///
/// Notification that a specified property has been changed.
///
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
// Reader control depends on the actual value of PageCount, PageNumber
// CanGoToPreviousPage and CanGoToNextPage. So when values of those
// properties are changing, schedule async update of the viewer.
if (e.Property == PageCountProperty || e.Property == MasterPageNumberProperty ||
e.Property == CanGoToPreviousPageProperty || e.Property == CanGoToNextPageProperty)
{
// If there is already pending update request, do nothng. Otherwise schedule a dispatcher task.
if (!_raisePageNumberChanged && !_raisePageCountChanged)
{
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(RaisePropertyChangedAsync), null);
}
// Treat CanGoToPage properties as PageNumber. Becasuse PageNumber change affects
// those properties, the reader control will update them.
if (e.Property == PageCountProperty)
{
_raisePageCountChanged = true;
CoerceValue(CanGoToNextPageProperty);
}
else if (e.Property == MasterPageNumberProperty)
{
_raisePageNumberChanged = true;
CoerceValue(CanGoToNextPageProperty);
}
else
{
_raisePageNumberChanged = true;
}
}
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Private Methods
//
//--------------------------------------------------------------------
#region Private Methods
///
/// Set TextSelection.
///
private object SetTextSelection(object arg)
{
ITextSelection newTextSelection = arg as ITextSelection;
FlowDocument flowDocument = Document as FlowDocument;
if (newTextSelection != null && flowDocument != null &&
newTextSelection.AnchorPosition != null &&
newTextSelection.AnchorPosition.TextContainer == flowDocument.StructuralCache.TextContainer)
{
ITextSelection textSelection = flowDocument.StructuralCache.TextContainer.TextSelection;
if (textSelection != null)
{
textSelection.SetCaretToPosition(newTextSelection.AnchorPosition, newTextSelection.MovingPosition.LogicalDirection, true, true);
textSelection.ExtendToPosition(newTextSelection.MovingPosition);
}
}
return null;
}
///
/// Asynchronously notify about property changes.
///
private object RaisePropertyChangedAsync(object arg)
{
// PageCount and PageNumber are dependent on associated DP values.
// Hence need to raise changed events when those DPs are changing.
if (_raisePageCountChanged)
{
if (_pageCountChanged != null)
{
_pageCountChanged(this, EventArgs.Empty);
}
_raisePageCountChanged = false;
}
if (_raisePageNumberChanged)
{
if (_pageNumberChanged != null)
{
_pageNumberChanged(this, EventArgs.Empty);
}
_raisePageNumberChanged = false;
}
return null;
}
#endregion Private Methods
//-------------------------------------------------------------------
//
// Private Fields
//
//--------------------------------------------------------------------
#region Private Fields
private EventHandler _pageNumberChanged;
private EventHandler _pageCountChanged;
private EventHandler _printCompleted;
private EventHandler _printStarted;
private bool _raisePageNumberChanged;
private bool _raisePageCountChanged;
#endregion Private Fields
//--------------------------------------------------------------------
//
// IFlowDocumentViewer Members
//
//-------------------------------------------------------------------
#region IFlowDocumentViewer Members
///
///
void IFlowDocumentViewer.PreviousPage()
{
OnPreviousPageCommand();
}
///
///
void IFlowDocumentViewer.NextPage()
{
OnNextPageCommand();
}
///
///
void IFlowDocumentViewer.FirstPage()
{
OnFirstPageCommand();
}
///
///
void IFlowDocumentViewer.LastPage()
{
OnLastPageCommand();
}
///
///
void IFlowDocumentViewer.Print()
{
OnPrintCommand();
}
///
///
void IFlowDocumentViewer.CancelPrint()
{
OnCancelPrintCommand();
}
///
///
void IFlowDocumentViewer.ShowFindResult(ITextRange findResult)
{
if (findResult.Start is ContentPosition)
{
BringContentPositionIntoView((ContentPosition)findResult.Start);
}
}
///
///
bool IFlowDocumentViewer.CanGoToPage(int pageNumber)
{
return CanGoToPage(pageNumber);
}
///
///
void IFlowDocumentViewer.GoToPage(int pageNumber)
{
OnGoToPageCommand(pageNumber);
}
///
///
void IFlowDocumentViewer.SetDocument(FlowDocument document)
{
Document = document;
}
///
///
ContentPosition IFlowDocumentViewer.ContentPosition
{
get { return ContentPosition; }
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(BringContentPositionIntoView), value);
}
}
}
///
///
ITextSelection IFlowDocumentViewer.TextSelection
{
get
{
return this.Selection;
}
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(SetTextSelection), value);
}
}
}
///
///
bool IFlowDocumentViewer.CanGoToPreviousPage
{
get { return CanGoToPreviousPage; }
}
///
///
bool IFlowDocumentViewer.CanGoToNextPage
{
get { return CanGoToNextPage; }
}
///
///
int IFlowDocumentViewer.PageNumber
{
get { return MasterPageNumber; }
}
///
///
int IFlowDocumentViewer.PageCount
{
get { return PageCount; }
}
///
///
event EventHandler IFlowDocumentViewer.PageNumberChanged
{
add { _pageNumberChanged += value; }
remove { _pageNumberChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PageCountChanged
{
add { _pageCountChanged += value; }
remove { _pageCountChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintStarted
{
add { _printStarted += value; }
remove { _printStarted -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintCompleted
{
add { _printCompleted += value; }
remove { _printCompleted -= value; }
}
#endregion IFlowDocumentViewer Members
}
///
/// This class is an internal subclass of the FlowDocumentPageViewer that provides
/// IFlowDocumentViewer interface used by FlowDocumentReader.
/// In addition to that it also provides support for TwoPage view.
///
internal class ReaderTwoPageViewer : ReaderPageViewer
{
//--------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
///
/// Handler for the PreviousPage command.
///
protected override void OnPreviousPageCommand()
{
GoToPage(Math.Max(1, MasterPageNumber - 2));
}
///
/// Handler for the NextPage command.
///
protected override void OnNextPageCommand()
{
GoToPage(Math.Min(PageCount, MasterPageNumber + 2));
}
///
/// Handler for the LastPage command.
///
protected override void OnLastPageCommand()
{
// Always navigate to odd PageNumber
GoToPage(PageCount);
}
///
/// Handler for the GoToPage command.
///
///
protected override void OnGoToPageCommand(int pageNumber)
{
// Go to only odd page numbers.
base.OnGoToPageCommand((((pageNumber - 1) / 2) * 2) + 1);
}
///
/// Notification that a specified property has been changed.
///
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == MasterPageNumberProperty)
{
// Only odd page numbers are allowed.
int pageNumber = (int)e.NewValue;
pageNumber = (((pageNumber - 1) / 2) * 2) + 1;
if (pageNumber != (int)e.NewValue)
{
GoToPage(pageNumber);
}
}
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
static ReaderTwoPageViewer()
{
CanGoToNextPagePropertyKey.OverrideMetadata(typeof(ReaderTwoPageViewer), new FrameworkPropertyMetadata(BooleanBoxes.FalseBox, null, new CoerceValueCallback(CoerceCanGoToNextPage)));
}
///
/// Coerce the value for CanGoToNextPage property.
///
private static object CoerceCanGoToNextPage(DependencyObject d, object value)
{
Invariant.Assert(d != null && d is ReaderTwoPageViewer);
ReaderTwoPageViewer viewer = (ReaderTwoPageViewer)d;
return (viewer.MasterPageNumber < viewer.PageCount - 1);
}
#endregion Private Methods
}
}
// 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.
//
//---------------------------------------------------------------------------
using System; // Object, IServiceProvider
using System.Windows; // Rect, Point
using System.Windows.Documents; // ITextSelection
using System.Windows.Controls; // FlowDocumentScrollViewer
using System.Windows.Controls.Primitives; // IScrollInfo
using System.Windows.Input; // UICommand
using System.Windows.Threading; // Dispatcher
using MS.Internal.KnownBoxes; // BooleanBoxes
namespace MS.Internal.Documents
{
///
/// An IFlowDocumentViewer is used for FlowDocumentReader in order to simplify its
/// view switching logic.
///
internal interface IFlowDocumentViewer
{
///
/// Navigate to the previous page.
///
void PreviousPage();
///
/// Navigate to the next page.
///
void NextPage();
///
/// Navigate to the first page.
///
void FirstPage();
///
/// Navigate to the last page.
///
void LastPage();
///
/// Print the document.
///
void Print();
///
/// Cancel printing of the document.
///
void CancelPrint();
///
/// Show find result.
///
void ShowFindResult(ITextRange findResult);
///
/// Whether can navigate to specific page number.
///
/// Requested page number.
/// Whether navigation is possible or not.
bool CanGoToPage(int pageNumber);
///
/// Navigate to requested page number.
///
/// Requested page number.
void GoToPage(int pageNumber);
///
/// Associate the viewer with new document.
///
/// New document.
void SetDocument(FlowDocument document);
///
/// The content position of the document showed in the control.
///
ContentPosition ContentPosition { get; set; }
///
/// The Selection of TextEditor
///
ITextSelection TextSelection { get; set; }
///
/// Whether can navigate to the previous page.
///
bool CanGoToPreviousPage { get; }
///
/// Whether can navigate to the next page.
///
bool CanGoToNextPage { get; }
///
/// The one-based page number of the page being displayed.
/// If there is no content, this value will be 0.
///
int PageNumber { get; }
///
/// The number of pages currently available for viewing.
///
int PageCount { get; }
///
/// Fired when the current page number has been changed.
///
event EventHandler PageNumberChanged;
///
/// Fired when the page count has been changed.
///
event EventHandler PageCountChanged;
///
/// Fired when the print has been started.
///
event EventHandler PrintStarted;
///
/// Fired when the print has been completed.
///
event EventHandler PrintCompleted;
}
///
/// This class is an internal subclass of the FlowDocumentScrollViewer that provides
/// IFlowDocumentViewer interface used by FlowDocumentReader.
///
internal class ReaderScrollViewer : FlowDocumentScrollViewer, IFlowDocumentViewer
{
//-------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
///
/// Called when print has been completed.
///
protected override void OnPrintCompleted()
{
base.OnPrintCompleted();
if (_printCompleted != null)
{
_printCompleted(this, EventArgs.Empty);
}
}
///
/// Handler for the Print command.
///
protected override void OnPrintCommand()
{
base.OnPrintCommand();
if (_printStarted != null && IsPrinting)
{
_printStarted(this, EventArgs.Empty);
}
}
///
/// Notification that a specified property has been changed.
///
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
// PageCount and PageNumber are dependent on Document property value.
// Hence need to raise changed events when Document property is changing.
if (e.Property == DocumentProperty)
{
if (_pageNumberChanged != null)
{
_pageNumberChanged(this, EventArgs.Empty);
}
if (_pageCountChanged != null)
{
_pageCountChanged(this, EventArgs.Empty);
}
}
}
#endregion Protected Methods
//--------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
///
/// Returns whether TextSelection is valid for document - As this is flow document, we require the text containers to be equal
/// to allow it as a valid selection.
///
private bool IsValidTextSelectionForDocument(ITextSelection textSelection, FlowDocument flowDocument)
{
if(textSelection.Start != null && textSelection.Start.TextContainer == flowDocument.StructuralCache.TextContainer)
{
return true;
}
return false;
}
///
/// Set TextSelection.
///
private object SetTextSelection(object arg)
{
ITextSelection newTextSelection = arg as ITextSelection;
if (newTextSelection != null && Document != null && IsValidTextSelectionForDocument(newTextSelection, Document))
{
ITextSelection textSelection = Document.StructuralCache.TextContainer.TextSelection;
if (textSelection != null)
{
textSelection.SetCaretToPosition(newTextSelection.AnchorPosition, newTextSelection.MovingPosition.LogicalDirection, true, true);
textSelection.ExtendToPosition(newTextSelection.MovingPosition);
}
}
return null;
}
#endregion Private Methods
//--------------------------------------------------------------------
//
// Private Fields
//
//--------------------------------------------------------------------
#region Private Fields
private EventHandler _pageNumberChanged;
private EventHandler _pageCountChanged;
private EventHandler _printCompleted;
private EventHandler _printStarted;
#endregion Private Fields
//-------------------------------------------------------------------
//
// IFlowDocumentViewer Members
//
//--------------------------------------------------------------------
#region IFlowDocumentViewer Members
///
///
void IFlowDocumentViewer.PreviousPage()
{
if (ScrollViewer != null)
{
ScrollViewer.PageUp();
}
}
///
///
void IFlowDocumentViewer.NextPage()
{
if (ScrollViewer != null)
{
ScrollViewer.PageDown();
}
}
///
///
void IFlowDocumentViewer.FirstPage()
{
if (ScrollViewer != null)
{
ScrollViewer.ScrollToHome();
}
}
///
///
void IFlowDocumentViewer.LastPage()
{
if (ScrollViewer != null)
{
ScrollViewer.ScrollToEnd();
}
}
///
///
void IFlowDocumentViewer.Print()
{
OnPrintCommand();
}
///
///
void IFlowDocumentViewer.CancelPrint()
{
OnCancelPrintCommand();
}
///
///
void IFlowDocumentViewer.ShowFindResult(ITextRange findResult)
{
// If we found something, TextEditor will bring the selection into view.
// It is possible, because RenderScope is inside ScrollViewer.
}
///
///
bool IFlowDocumentViewer.CanGoToPage(int pageNumber)
{
// FlowDocumentScrollViewer is always a 1 page document, so its page number will always be 1
return (pageNumber == 1);
}
///
///
void IFlowDocumentViewer.GoToPage(int pageNumber)
{
if (pageNumber == 1 && ScrollViewer != null)
{
ScrollViewer.ScrollToHome();
}
}
///
///
void IFlowDocumentViewer.SetDocument(FlowDocument document)
{
Document = document;
}
///
///
ContentPosition IFlowDocumentViewer.ContentPosition
{
get
{
return this.ContentPosition;
}
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(BringContentPositionIntoView), value);
}
}
}
///
///
ITextSelection IFlowDocumentViewer.TextSelection
{
get
{
return this.Selection;
}
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(SetTextSelection), value);
}
}
}
///
///
bool IFlowDocumentViewer.CanGoToPreviousPage
{
get { return false; }
}
///
///
bool IFlowDocumentViewer.CanGoToNextPage
{
get { return false; }
}
///
///
int IFlowDocumentViewer.PageNumber
{
get { return (Document != null) ? 1 : 0; }
}
///
///
int IFlowDocumentViewer.PageCount
{
get { return (Document != null) ? 1 : 0; }
}
///
///
event EventHandler IFlowDocumentViewer.PageNumberChanged
{
add { _pageNumberChanged += value; }
remove { _pageNumberChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PageCountChanged
{
add { _pageCountChanged += value; }
remove { _pageCountChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintStarted
{
add { _printStarted += value; }
remove { _printStarted -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintCompleted
{
add { _printCompleted += value; }
remove { _printCompleted -= value; }
}
#endregion IFlowDocumentViewer Members
}
///
/// This class is an internal subclass of the FlowDocumentPageViewer that provides
/// IFlowDocumentViewer interface used by FlowDocumentReader.
///
internal class ReaderPageViewer : FlowDocumentPageViewer, IFlowDocumentViewer
{
//-------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
///
/// Called when print has been completed.
///
protected override void OnPrintCompleted()
{
base.OnPrintCompleted();
if (_printCompleted != null)
{
_printCompleted(this, EventArgs.Empty);
}
}
///
/// Handler for the Print command.
///
protected override void OnPrintCommand()
{
base.OnPrintCommand();
if (_printStarted != null && IsPrinting)
{
_printStarted(this, EventArgs.Empty);
}
}
///
/// Notification that a specified property has been changed.
///
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
// Reader control depends on the actual value of PageCount, PageNumber
// CanGoToPreviousPage and CanGoToNextPage. So when values of those
// properties are changing, schedule async update of the viewer.
if (e.Property == PageCountProperty || e.Property == MasterPageNumberProperty ||
e.Property == CanGoToPreviousPageProperty || e.Property == CanGoToNextPageProperty)
{
// If there is already pending update request, do nothng. Otherwise schedule a dispatcher task.
if (!_raisePageNumberChanged && !_raisePageCountChanged)
{
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(RaisePropertyChangedAsync), null);
}
// Treat CanGoToPage properties as PageNumber. Becasuse PageNumber change affects
// those properties, the reader control will update them.
if (e.Property == PageCountProperty)
{
_raisePageCountChanged = true;
CoerceValue(CanGoToNextPageProperty);
}
else if (e.Property == MasterPageNumberProperty)
{
_raisePageNumberChanged = true;
CoerceValue(CanGoToNextPageProperty);
}
else
{
_raisePageNumberChanged = true;
}
}
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Private Methods
//
//--------------------------------------------------------------------
#region Private Methods
///
/// Set TextSelection.
///
private object SetTextSelection(object arg)
{
ITextSelection newTextSelection = arg as ITextSelection;
FlowDocument flowDocument = Document as FlowDocument;
if (newTextSelection != null && flowDocument != null &&
newTextSelection.AnchorPosition != null &&
newTextSelection.AnchorPosition.TextContainer == flowDocument.StructuralCache.TextContainer)
{
ITextSelection textSelection = flowDocument.StructuralCache.TextContainer.TextSelection;
if (textSelection != null)
{
textSelection.SetCaretToPosition(newTextSelection.AnchorPosition, newTextSelection.MovingPosition.LogicalDirection, true, true);
textSelection.ExtendToPosition(newTextSelection.MovingPosition);
}
}
return null;
}
///
/// Asynchronously notify about property changes.
///
private object RaisePropertyChangedAsync(object arg)
{
// PageCount and PageNumber are dependent on associated DP values.
// Hence need to raise changed events when those DPs are changing.
if (_raisePageCountChanged)
{
if (_pageCountChanged != null)
{
_pageCountChanged(this, EventArgs.Empty);
}
_raisePageCountChanged = false;
}
if (_raisePageNumberChanged)
{
if (_pageNumberChanged != null)
{
_pageNumberChanged(this, EventArgs.Empty);
}
_raisePageNumberChanged = false;
}
return null;
}
#endregion Private Methods
//-------------------------------------------------------------------
//
// Private Fields
//
//--------------------------------------------------------------------
#region Private Fields
private EventHandler _pageNumberChanged;
private EventHandler _pageCountChanged;
private EventHandler _printCompleted;
private EventHandler _printStarted;
private bool _raisePageNumberChanged;
private bool _raisePageCountChanged;
#endregion Private Fields
//--------------------------------------------------------------------
//
// IFlowDocumentViewer Members
//
//-------------------------------------------------------------------
#region IFlowDocumentViewer Members
///
///
void IFlowDocumentViewer.PreviousPage()
{
OnPreviousPageCommand();
}
///
///
void IFlowDocumentViewer.NextPage()
{
OnNextPageCommand();
}
///
///
void IFlowDocumentViewer.FirstPage()
{
OnFirstPageCommand();
}
///
///
void IFlowDocumentViewer.LastPage()
{
OnLastPageCommand();
}
///
///
void IFlowDocumentViewer.Print()
{
OnPrintCommand();
}
///
///
void IFlowDocumentViewer.CancelPrint()
{
OnCancelPrintCommand();
}
///
///
void IFlowDocumentViewer.ShowFindResult(ITextRange findResult)
{
if (findResult.Start is ContentPosition)
{
BringContentPositionIntoView((ContentPosition)findResult.Start);
}
}
///
///
bool IFlowDocumentViewer.CanGoToPage(int pageNumber)
{
return CanGoToPage(pageNumber);
}
///
///
void IFlowDocumentViewer.GoToPage(int pageNumber)
{
OnGoToPageCommand(pageNumber);
}
///
///
void IFlowDocumentViewer.SetDocument(FlowDocument document)
{
Document = document;
}
///
///
ContentPosition IFlowDocumentViewer.ContentPosition
{
get { return ContentPosition; }
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(BringContentPositionIntoView), value);
}
}
}
///
///
ITextSelection IFlowDocumentViewer.TextSelection
{
get
{
return this.Selection;
}
set
{
if (value != null && Document != null)
{
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(SetTextSelection), value);
}
}
}
///
///
bool IFlowDocumentViewer.CanGoToPreviousPage
{
get { return CanGoToPreviousPage; }
}
///
///
bool IFlowDocumentViewer.CanGoToNextPage
{
get { return CanGoToNextPage; }
}
///
///
int IFlowDocumentViewer.PageNumber
{
get { return MasterPageNumber; }
}
///
///
int IFlowDocumentViewer.PageCount
{
get { return PageCount; }
}
///
///
event EventHandler IFlowDocumentViewer.PageNumberChanged
{
add { _pageNumberChanged += value; }
remove { _pageNumberChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PageCountChanged
{
add { _pageCountChanged += value; }
remove { _pageCountChanged -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintStarted
{
add { _printStarted += value; }
remove { _printStarted -= value; }
}
///
///
event EventHandler IFlowDocumentViewer.PrintCompleted
{
add { _printCompleted += value; }
remove { _printCompleted -= value; }
}
#endregion IFlowDocumentViewer Members
}
///
/// This class is an internal subclass of the FlowDocumentPageViewer that provides
/// IFlowDocumentViewer interface used by FlowDocumentReader.
/// In addition to that it also provides support for TwoPage view.
///
internal class ReaderTwoPageViewer : ReaderPageViewer
{
//--------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
///
/// Handler for the PreviousPage command.
///
protected override void OnPreviousPageCommand()
{
GoToPage(Math.Max(1, MasterPageNumber - 2));
}
///
/// Handler for the NextPage command.
///
protected override void OnNextPageCommand()
{
GoToPage(Math.Min(PageCount, MasterPageNumber + 2));
}
///
/// Handler for the LastPage command.
///
protected override void OnLastPageCommand()
{
// Always navigate to odd PageNumber
GoToPage(PageCount);
}
///
/// Handler for the GoToPage command.
///
///
protected override void OnGoToPageCommand(int pageNumber)
{
// Go to only odd page numbers.
base.OnGoToPageCommand((((pageNumber - 1) / 2) * 2) + 1);
}
///
/// Notification that a specified property has been changed.
///
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == MasterPageNumberProperty)
{
// Only odd page numbers are allowed.
int pageNumber = (int)e.NewValue;
pageNumber = (((pageNumber - 1) / 2) * 2) + 1;
if (pageNumber != (int)e.NewValue)
{
GoToPage(pageNumber);
}
}
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
static ReaderTwoPageViewer()
{
CanGoToNextPagePropertyKey.OverrideMetadata(typeof(ReaderTwoPageViewer), new FrameworkPropertyMetadata(BooleanBoxes.FalseBox, null, new CoerceValueCallback(CoerceCanGoToNextPage)));
}
///
/// Coerce the value for CanGoToNextPage property.
///
private static object CoerceCanGoToNextPage(DependencyObject d, object value)
{
Invariant.Assert(d != null && d is ReaderTwoPageViewer);
ReaderTwoPageViewer viewer = (ReaderTwoPageViewer)d;
return (viewer.MasterPageNumber < viewer.PageCount - 1);
}
#endregion Private Methods
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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