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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// Description: FlowDocumentPageViewer provides a simple user experience for viewing
// one page of content at a time. The experience is optimized for
// FlowDocument scenarios, however any IDocumentPaginatorSource
// can be viewed using this control.
//
using System.Collections.Generic; // Stack<T>
using System.Collections.ObjectModel; // ReadOnlyCollection<T>
using System.Windows.Automation.Peers; // AutomationPeer
using System.Windows.Documents; // IDocumentPaginatorSouce, ...
using System.Windows.Documents.Serialization; // WritingCompletedEventArgs
using System.Windows.Input; // UICommand
using System.Windows.Media; // VisualTreeHelper
using System.Windows.Controls.Primitives; // DocumentViewerBase, DocumentPageView
using System.Windows.Threading;
using MS.Internal; // Invariant, DoubleUtil
using MS.Internal.Commands; // CommandHelpers
using MS.Internal.Documents; // FindToolBar
using MS.Internal.KnownBoxes; // BooleanBoxes
using MS.Internal.PresentationFramework; // SecurityHelper
using MS.Internal.AppModel; // IJournalState
using System.Security; // SecurityCritical, SecurityTreatAsSafe
namespace System.Windows.Controls
{
/// <summary>
/// FlowDocumentPageViewer provides a simple user experience for viewing one page
/// of content at a time. The experience is optimized for FlowDocument scenarios,
/// however any IDocumentPaginatorSource can be viewed using this control.
/// </summary>
[TemplatePart(Name = "PART_FindToolBarHost", Type = typeof(Decorator))]
public class FlowDocumentPageViewer : DocumentViewerBase, IJournalState
{
//-------------------------------------------------------------------
//
// Constructors
//
//-------------------------------------------------------------------
#region Constructors
/// <summary>
/// Initializes class-wide settings.
/// </summary>
static FlowDocumentPageViewer()
{
DefaultStyleKeyProperty.OverrideMetadata(
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(new ComponentResourceKey(typeof(PresentationUIStyleResources), "PUIFlowDocumentPageViewer")));
_dType = DependencyObjectType.FromSystemTypeInternal(typeof(FlowDocumentPageViewer));
TextBoxBase.SelectionBrushProperty.OverrideMetadata(typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
TextBoxBase.SelectionOpacityProperty.OverrideMetadata(typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(TextBoxBase.AdornerSelectionOpacityDefaultValue, new PropertyChangedCallback(UpdateCaretElement)));
// Create our CommandBindings
CreateCommandBindings();
EventManager.RegisterClassHandler(typeof(FlowDocumentPageViewer), Keyboard.KeyDownEvent, new KeyEventHandler(KeyDownHandler), true);
}
/// <summary>
/// Instantiates a new instance of a FlowDocumentPageViewer.
/// </summary>
public FlowDocumentPageViewer()
: base()
{
this.LayoutUpdated += new EventHandler(HandleLayoutUpdated);
}
#endregion Constructors
//-------------------------------------------------------------------
//
// Public Methods
//
//-------------------------------------------------------------------
#region Public Methods
/// <summary>
/// Called when the Template's tree has been generated
/// </summary>
/// <returns>Whether Visuals were added to the tree.</returns>
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
// Initialize FindTooBar host.
// If old FindToolBar is enabled, disable it first to ensure appropriate cleanup.
if (FindToolBar != null)
{
ToggleFindToolBar(false);
}
_findToolBarHost = GetTemplateChild(_findToolBarHostTemplateName) as Decorator;
}
/// <summary>
/// Increases the current zoom.
/// </summary>
public void IncreaseZoom()
{
OnIncreaseZoomCommand();
}
/// <summary>
/// Decreases the current zoom.
/// </summary>
public void DecreaseZoom()
{
OnDecreaseZoomCommand();
}
/// <summary>
/// Invokes the Find Toolbar. This is analogous to the ApplicationCommands.Find.
/// </summary>
public void Find()
{
OnFindCommand();
}
#endregion Public Methods
//-------------------------------------------------------------------
//
// Public Properties
//
//-------------------------------------------------------------------
#region Public Properties
/// <summary>
/// Text Selection (readonly)
/// </summary>
public TextSelection Selection
{
get
{
ITextSelection textSelection = null;
FlowDocument flowDocument = Document as FlowDocument;
if (flowDocument != null)
{
textSelection = flowDocument.StructuralCache.TextContainer.TextSelection;
}
return textSelection as TextSelection;
}
}
/// <summary>
/// The Zoom applied to all pages; this value is 100-based.
/// </summary>
public double Zoom
{
get { return (double) GetValue(ZoomProperty); }
set { SetValue(ZoomProperty, value); }
}
/// <summary>
/// The maximum allowed value of the Zoom property.
/// </summary>
public double MaxZoom
{
get { return (double) GetValue(MaxZoomProperty); }
set { SetValue(MaxZoomProperty, value); }
}
/// <summary>
/// The minimum allowed value of the Zoom property.
/// </summary>
public double MinZoom
{
get { return (double) GetValue(MinZoomProperty); }
set { SetValue(MinZoomProperty, value); }
}
/// <summary>
/// The amount the Zoom property is incremented or decremented when
/// the IncreaseZoom or DecreaseZoom command is executed.
/// </summary>
public double ZoomIncrement
{
get { return (double) GetValue(ZoomIncrementProperty); }
set { SetValue(ZoomIncrementProperty, value); }
}
/// <summary>
/// Whether the viewer can increase the current zoom.
/// </summary>
public virtual bool CanIncreaseZoom
{
get { return (bool) GetValue(CanIncreaseZoomProperty); }
}
/// <summary>
/// Whether the viewer can decrease the current zoom.
/// </summary>
public virtual bool CanDecreaseZoom
{
get { return (bool) GetValue(CanDecreaseZoomProperty); }
}
/// <summary>
/// <see cref="TextBoxBase.SelectionBrushProperty" />
/// </summary>
public Brush SelectionBrush
{
get { return (Brush)GetValue(SelectionBrushProperty); }
set { SetValue(SelectionBrushProperty, value); }
}
/// <summary>
/// <see cref="TextBoxBase.SelectionOpacityProperty"/>
/// </summary>
public double SelectionOpacity
{
get { return (double)GetValue(SelectionOpacityProperty); }
set { SetValue(SelectionOpacityProperty, value); }
}
/// <summary>
/// <see cref="TextBoxBase.IsSelectionActive"/>
/// </summary>
public bool IsSelectionActive
{
get { return (bool)GetValue(IsSelectionActiveProperty); }
}
/// <summary>
/// <see cref="TextBoxBase.IsInactiveSelectionHighlightEnabled"/>
/// </summary>
public bool IsInactiveSelectionHighlightEnabled
{
get { return (bool)GetValue(IsInactiveSelectionHighlightEnabledProperty); }
set { SetValue(IsInactiveSelectionHighlightEnabledProperty, value); }
}
#region Public Dynamic Properties
/// <summary>
/// <see cref="Zoom"/>
/// </summary>
public static readonly DependencyProperty ZoomProperty =
DependencyProperty.Register(
"Zoom",
typeof(double),
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(
100d,
new PropertyChangedCallback(ZoomChanged),
new CoerceValueCallback(CoerceZoom)),
new ValidateValueCallback(ZoomValidateValue));
/// <summary>
/// <see cref="MaxZoom"/>
/// </summary>
public static readonly DependencyProperty MaxZoomProperty =
DependencyProperty.Register(
"MaxZoom",
typeof(double),
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(
200d,
new PropertyChangedCallback(MaxZoomChanged),
new CoerceValueCallback(CoerceMaxZoom)),
new ValidateValueCallback(ZoomValidateValue));
/// <summary>
/// <see cref="MinZoom"/>
/// </summary>
public static readonly DependencyProperty MinZoomProperty =
DependencyProperty.Register(
"MinZoom",
typeof(double),
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(
80d,
new PropertyChangedCallback(MinZoomChanged)),
new ValidateValueCallback(ZoomValidateValue));
/// <summary>
/// <see cref="ZoomIncrement"/>
/// </summary>
public static readonly DependencyProperty ZoomIncrementProperty =
DependencyProperty.Register(
"ZoomIncrement",
typeof(double),
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(10d),
new ValidateValueCallback(ZoomValidateValue));
/// <summary>
/// <see cref="CanIncreaseZoom"/>
/// </summary>
protected static readonly DependencyPropertyKey CanIncreaseZoomPropertyKey =
DependencyProperty.RegisterReadOnly(
"CanIncreaseZoom",
typeof(bool),
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(true));
/// <summary>
/// <see cref="CanIncreaseZoom"/>
/// </summary>
public static readonly DependencyProperty CanIncreaseZoomProperty = CanIncreaseZoomPropertyKey.DependencyProperty;
/// <summary>
/// <see cref="CanDecreaseZoom"/>
/// </summary>
protected static readonly DependencyPropertyKey CanDecreaseZoomPropertyKey =
DependencyProperty.RegisterReadOnly(
"CanDecreaseZoom",
typeof(bool),
typeof(FlowDocumentPageViewer),
new FrameworkPropertyMetadata(true));
/// <summary>
/// <see cref="CanDecreaseZoom"/>
/// </summary>
public static readonly DependencyProperty CanDecreaseZoomProperty =
CanDecreaseZoomPropertyKey.DependencyProperty;
/// <summary>
/// <see cref="TextBoxBase.SelectionBrushProperty"/>
/// </summary>
public static readonly DependencyProperty SelectionBrushProperty =
TextBoxBase.SelectionBrushProperty.AddOwner(typeof(FlowDocumentPageViewer));
/// <summary>
/// <see cref="TextBoxBase.SelectionOpacityProperty"/>
/// </summary>
public static readonly DependencyProperty SelectionOpacityProperty =
TextBoxBase.SelectionOpacityProperty.AddOwner(typeof(FlowDocumentPageViewer));
/// <summary>
/// <see cref="TextBoxBase.IsSelectionActiveProperty"/>
/// </summary>
public static readonly DependencyProperty IsSelectionActiveProperty =
TextBoxBase.IsSelectionActiveProperty.AddOwner(typeof(FlowDocumentPageViewer));
/// <summary>
/// <see cref="TextBoxBase.IsInactiveSelectionHighlightEnabledProperty"/>
/// </summary>
public static readonly DependencyProperty IsInactiveSelectionHighlightEnabledProperty =
TextBoxBase.IsInactiveSelectionHighlightEnabledProperty.AddOwner(typeof(FlowDocumentPageViewer));
#endregion Public Dynamic Properties
#endregion Public Properties
//-------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------
#region Protected Methods
/// <summary>
/// Creates AutomationPeer (<see cref="UIElement.OnCreateAutomationPeer"/>)
/// </summary>
protected override AutomationPeer OnCreateAutomationPeer()
{
return new FlowDocumentPageViewerAutomationPeer(this);
}
/// <summary>
/// This is the method that responds to the KeyDown event.
/// </summary>
/// <param name="e">Event arguments</param>
protected override void OnKeyDown(KeyEventArgs e)
{
// Esc -- Close FindToolBar
if (e.Key == Key.Escape)
{
if (FindToolBar != null)
{
ToggleFindToolBar(false);
e.Handled = true;
}
}
// F3 -- Invoke Find
if (e.Key == Key.F3)
{
if (CanShowFindToolBar)
{
if (FindToolBar != null)
{
// If the Shift key is also pressed, then search up.
FindToolBar.SearchUp = ((e.KeyboardDevice.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift);
OnFindInvoked(this, EventArgs.Empty);
}
else
{
// Make the FindToolbar visible
ToggleFindToolBar(true);
}
e.Handled = true;
}
}
// If not handled, do default handling.
if (!e.Handled)
{
base.OnKeyDown(e);
}
}
/// <summary>
/// An event reporting a mouse wheel rotation.
/// </summary>
protected override void OnMouseWheel(MouseWheelEventArgs e)
{
// [Mouse Wheel + Control] - zooming
// [Mouse Wheel] - page navigation
if (e.Delta != 0)
{
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
if (e.Delta > 0)
{
IncreaseZoom();
}
else
{
DecreaseZoom();
}
}
else
{
if (e.Delta > 0)
{
PreviousPage();
}
else
{
NextPage();
}
}
e.Handled = false;
}
// If not handled, do default handling.
if (!e.Handled)
{
base.OnMouseWheel(e);
}
}
/// <summary>
/// Called when ContextMenuOpening is raised on this element.
/// </summary>
/// <param name="e">Event arguments</param>
protected override void OnContextMenuOpening(ContextMenuEventArgs e)
{
base.OnContextMenuOpening(e);
DocumentViewerHelper.OnContextMenuOpening(Document as FlowDocument, this, e);
}
/// <summary>
/// Called when the PageViews collection is modified; this occurs when GetPageViewsCollection
/// returns True or if the control's template is modified.
/// </summary>
protected override void OnPageViewsChanged()
{
// Change of DocumentPageView collection resets current ContentPosition.
// This position is updated when layout process is done.
_contentPosition = null;
// Apply zoom value to new DocumentPageViews
ApplyZoom();
base.OnPageViewsChanged();
}
/// <summary>
/// Called when the Document property is changed.
/// </summary>
protected override void OnDocumentChanged()
{
// Document change resets current ContentPosition.
_contentPosition = null;
// _oldDocument is cached from previous document changed notification.
if (_oldDocument != null)
{
DynamicDocumentPaginator dynamicDocumentPaginator = _oldDocument.DocumentPaginator as DynamicDocumentPaginator;
if (dynamicDocumentPaginator != null)
{
dynamicDocumentPaginator.GetPageNumberCompleted -= new GetPageNumberCompletedEventHandler(HandleGetPageNumberCompleted);
}
FlowDocumentPaginator flowDocumentPaginator = _oldDocument.DocumentPaginator as FlowDocumentPaginator;
if (flowDocumentPaginator != null)
{
flowDocumentPaginator.BreakRecordTableInvalidated -= new BreakRecordTableInvalidatedEventHandler(HandleAllBreakRecordsInvalidated);
}
}
base.OnDocumentChanged();
_oldDocument = Document;
// Validate the new document type
if (Document != null && !(Document is FlowDocument))
{
// Undo new document assignment.
Document = null;
// Throw exception.
throw new NotSupportedException(SR.FlowDocumentPageViewerOnlySupportsFlowDocument);
}
if(Document != null)
{
DynamicDocumentPaginator dynamicDocumentPaginator = Document.DocumentPaginator as DynamicDocumentPaginator;
if (dynamicDocumentPaginator != null)
{
dynamicDocumentPaginator.GetPageNumberCompleted += new GetPageNumberCompletedEventHandler(HandleGetPageNumberCompleted);
}
FlowDocumentPaginator flowDocumentPaginator = Document.DocumentPaginator as FlowDocumentPaginator;
if (flowDocumentPaginator != null)
{
flowDocumentPaginator.BreakRecordTableInvalidated += new BreakRecordTableInvalidatedEventHandler(HandleAllBreakRecordsInvalidated);
}
}
// Update the toolbar with our current document state.
if (!CanShowFindToolBar)
{
// Disable FindToolBar, if the content does not support it.
if (FindToolBar != null)
{
ToggleFindToolBar(false);
}
}
// Go to the first page of new content.
OnGoToPageCommand(1);
}
/// <summary>
/// Called when print has been completed.
/// </summary>
protected virtual void OnPrintCompleted()
{
ClearPrintingState();
}
/// <summary>
/// Handler for the PreviousPage command.
/// </summary>
protected override void OnPreviousPageCommand()
{
if (this.CanGoToPreviousPage)
{
// Page navigation resets current ContentPosition.
// This position is updated when layout process is done.
_contentPosition = null;
base.OnPreviousPageCommand();
}
}
/// <summary>
/// Handler for the NextPage command.
/// </summary>
protected override void OnNextPageCommand()
{
if (this.CanGoToNextPage)
{
// Page navigation resets current ContentPosition.
// This position is updated when layout process is done.
_contentPosition = null;
base.OnNextPageCommand();
}
}
/// <summary>
/// Handler for the FirstPage command.
/// </summary>
protected override void OnFirstPageCommand()
{
if (this.CanGoToPreviousPage)
{
// Page navigation resets current ContentPosition.
// This position is updated when layout process is done.
_contentPosition = null;
base.OnFirstPageCommand();
}
}
/// <summary>
/// Handler for the LastPage command.
/// </summary>
protected override void OnLastPageCommand()
{
if (this.CanGoToNextPage)
{
// Page navigation resets current ContentPosition.
// This position is updated when layout process is done.
_contentPosition = null;
base.OnLastPageCommand();
}
}
/// <summary>
/// Handler for the GoToPage command.
/// </summary>
protected override void OnGoToPageCommand(int pageNumber)
{
if (CanGoToPage(pageNumber) && this.MasterPageNumber != pageNumber)
{
// Page navigation resets current ContentPosition.
// This position is updated when layout process is done.
_contentPosition = null;
base.OnGoToPageCommand(pageNumber);
}
}
/// <summary>
/// Handler for the Find command.
/// </summary>
protected virtual void OnFindCommand()
{
if (CanShowFindToolBar)
{
// Toggle on the FindToolBar between visible and hidden state.
ToggleFindToolBar(FindToolBar == null);
}
}
/// <summary>
/// Handler for the Print command.
/// </summary>
protected override void OnPrintCommand()
{
#if !DONOTREFPRINTINGASMMETA
System.Windows.Xps.XpsDocumentWriter docWriter;
System.Printing.PrintDocumentImageableArea ia = null;
FlowDocumentPaginator paginator;
FlowDocument document = Document as FlowDocument;
Thickness pagePadding;
// Only one printing job is allowed.
if (_printingState != null)
{
return;
}
// If the document is FlowDocument, do custom printing. Otherwise go through default path.
if (document != null)
{
// Show print dialog.
docWriter = System.Printing.PrintQueue.CreateXpsDocumentWriter(ref ia);
if (docWriter != null && ia != null)
{
// Store the current state of the document in the PrintingState
paginator = ((IDocumentPaginatorSource)document).DocumentPaginator as FlowDocumentPaginator;
_printingState = new FlowDocumentPrintingState();
_printingState.XpsDocumentWriter = docWriter;
_printingState.PageSize = paginator.PageSize;
_printingState.PagePadding = document.PagePadding;
_printingState.IsSelectionEnabled = IsSelectionEnabled;
// Since _printingState value is used to determine CanExecute state, we must invalidate that state.
CommandManager.InvalidateRequerySuggested();
// Register for XpsDocumentWriter events.
docWriter.WritingCompleted += new WritingCompletedEventHandler(HandlePrintCompleted);
docWriter.WritingCancelled += new WritingCancelledEventHandler(HandlePrintCancelled);
// Add PreviewCanExecute handler to have a chance to disable UI Commands during printing.
CommandManager.AddPreviewCanExecuteHandler(this, new CanExecuteRoutedEventHandler(PreviewCanExecuteRoutedEventHandler));
// Suspend layout on DocumentPageViews.
ReadOnlyCollection<DocumentPageView> pageViews = PageViews;
for (int index = 0; index < pageViews.Count; index++)
{
pageViews[index].SuspendLayout();
}
// Disable TextSelection, if currently enabled.
if (IsSelectionEnabled)
{
IsSelectionEnabled = false;
}
// Change the PageSize and PagePadding for the document to match the CanvasSize for the printer device.
paginator.PageSize = new Size(ia.MediaSizeWidth, ia.MediaSizeHeight);
pagePadding = document.ComputePageMargin();
document.PagePadding = new Thickness(
Math.Max(ia.OriginWidth, pagePadding.Left),
Math.Max(ia.OriginHeight, pagePadding.Top),
Math.Max(ia.MediaSizeWidth - (ia.OriginWidth + ia.ExtentWidth), pagePadding.Right),
Math.Max(ia.MediaSizeHeight - (ia.OriginHeight + ia.ExtentHeight), pagePadding.Bottom));
// Send DocumentPaginator to the printer.
docWriter.WriteAsync(paginator);
}
}
else
{
base.OnPrintCommand();
}
#endif // DONOTREFPRINTINGASMMETA
}
/// <summary>
/// Handler for the CancelPrint command.
/// </summary>
protected override void OnCancelPrintCommand()
{
#if !DONOTREFPRINTINGASMMETA
if (_printingState != null)
{
_printingState.XpsDocumentWriter.CancelAsync();
}
else
{
base.OnCancelPrintCommand();
}
#endif // DONOTREFPRINTINGASMMETA
}
/// <summary>
/// Handler for the IncreaseZoom command.
/// </summary>
protected virtual void OnIncreaseZoomCommand()
{
// If can zoom in, increase zoom by the zoom increment value.
if (this.CanIncreaseZoom)
{
SetCurrentValueInternal(ZoomProperty, Math.Min(Zoom + ZoomIncrement, MaxZoom));
}
}
/// <summary>
/// Handler for the DecreaseZoom command.
/// </summary>
protected virtual void OnDecreaseZoomCommand()
{
// If can zoom out, decrease zoom by the zoom increment value.
if (this.CanDecreaseZoom)
{
SetCurrentValueInternal(ZoomProperty, Math.Max(Zoom - ZoomIncrement, MinZoom));
}
}
#endregion Protected Methods
//-------------------------------------------------------------------
//
// Internal Methods
//
//-------------------------------------------------------------------
#region Internal Methods
/// <summary>
/// Allows FrameworkElement to augment the EventRoute.
/// </summary>
internal override bool BuildRouteCore(EventRoute route, RoutedEventArgs args)
{
// If FlowDocumentPageViewer is used as embedded viewer (in FlowDocumentReader),
// it is not part of logical tree, so default logic in FE to re-add logical
// tree from branched node does not work here.
// But before FlowDocumentPageViewer is added to the event route, logical
// ancestors up to Document need to be added to the route. Otherwise
// content will not have a chance to react to events first.
// This breaks navigation cursor management logic, because TextEditor attached
// to FlowDocumentPageViewer handles those events first.
DependencyObject document = this.Document as DependencyObject;
if (document != null && LogicalTreeHelper.GetParent(document) != this)
{
DependencyObject branchNode = route.PeekBranchNode() as DependencyObject;
if (branchNode != null && DocumentViewerHelper.IsLogicalDescendent(branchNode, document))
{
// Add intermediate ContentElements to the route.
FrameworkElement.AddIntermediateElementsToRoute(
LogicalTreeHelper.GetParent(document), route, args, LogicalTreeHelper.GetParent(branchNode));
}
}
return base.BuildRouteCore(route, args);
}
internal override bool InvalidateAutomationAncestorsCore(Stack<DependencyObject> branchNodeStack, out bool continuePastCoreTree)
{
bool continueInvalidation = true;
DependencyObject document = this.Document as DependencyObject;
if (document != null && LogicalTreeHelper.GetParent(document) != this)
{
DependencyObject branchNode = (branchNodeStack.Count > 0) ? branchNodeStack.Peek() : null;
if (branchNode != null && DocumentViewerHelper.IsLogicalDescendent(branchNode, document))
{
continueInvalidation = FrameworkElement.InvalidateAutomationIntermediateElements(LogicalTreeHelper.GetParent(document), LogicalTreeHelper.GetParent(branchNode));
}
}
continueInvalidation &= base.InvalidateAutomationAncestorsCore(branchNodeStack, out continuePastCoreTree);
return continueInvalidation;
}
/// <summary>
/// Brings specified point into view.
/// </summary>
/// <param name="point">Point in the viewer's coordinate system.</param>
/// <returns>Whether operation is pending or not.</returns>
/// <remarks>
/// It is guaranteed that Point is not over any existing pages.
/// </remarks>
internal bool BringPointIntoView(Point point)
{
int index;
Rect[] pageRects;
Rect pageRect;
ReadOnlyCollection<DocumentPageView> pageViews = this.PageViews;
bool bringIntoViewPending = false;
if (pageViews.Count > 0)
{
// Calculate rectangles for all pages.
pageRects = new Rect[pageViews.Count];
for (index = 0; index < pageViews.Count; index++)
{
pageRect = new Rect(pageViews[index].RenderSize);
pageRect = pageViews[index].TransformToAncestor(this).TransformBounds(pageRect);
pageRects[index] = pageRect;
}
// Try to find exact hit
for (index = 0; index < pageRects.Length; index++)
{
if (pageRects[index].Contains(point))
{
break;
}
}
if (index >= pageRects.Length)
{
// Union all rects.
pageRect = pageRects[0];
for (index = 1; index < pageRects.Length; index++)
{
pageRect.Union(pageRects[index]);
}
//
if (DoubleUtil.LessThan(point.X, pageRect.Left))
{
if (this.CanGoToPreviousPage)
{
OnPreviousPageCommand();
bringIntoViewPending = true;
}
}
else if (DoubleUtil.GreaterThan(point.X, pageRect.Right))
{
if (this.CanGoToNextPage)
{
OnNextPageCommand();
bringIntoViewPending = true;
}
}
else if (DoubleUtil.LessThan(point.Y, pageRect.Top))
{
if (this.CanGoToPreviousPage)
{
OnPreviousPageCommand();
bringIntoViewPending = true;
}
}
else if (DoubleUtil.GreaterThan(point.Y, pageRect.Bottom))
{
if (this.CanGoToNextPage)
{
OnNextPageCommand();
bringIntoViewPending = true;
}
}
}
}
return bringIntoViewPending;
}
/// <summary>
/// Bring specified content position into view.
/// </summary>
internal object BringContentPositionIntoView(object arg)
{
PrivateBringContentPositionIntoView(arg, false);
return null;
}
#endregion Internal Methods
//-------------------------------------------------------------------
//
// Internal Properties
//
//-------------------------------------------------------------------
#region Internal Properties
/// <summary>
/// ContentPosition representing currently viewed content.
/// </summary>
internal ContentPosition ContentPosition
{
get { return _contentPosition; }
}
/// <summary>
/// Whether FindToolBar can be enabled.
/// </summary>
internal bool CanShowFindToolBar
{
get { return (_findToolBarHost != null && this.Document != null && this.TextEditor != null); }
}
/// <summary>
/// Whether currently printing the content.
/// </summary>
internal bool IsPrinting
{
get { return (_printingState != null); }
}
#endregion Internal Properties
//-------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
/// <summary>
/// Handler for LayoutUpdated event raised by the LayoutSystem.
/// </summary>
private void HandleLayoutUpdated(object sender, EventArgs e)
{
DocumentPageView masterPageView;
DynamicDocumentPaginator documentPaginator;
// Ignore LayoutUpdated during printing.
if (this.Document != null && _printingState == null)
{
documentPaginator = this.Document.DocumentPaginator as DynamicDocumentPaginator;
if (documentPaginator != null)
{
// Update ContentPosition, if not cached.
if (_contentPosition == null)
{
masterPageView = GetMasterPageView();
if (masterPageView != null && masterPageView.DocumentPage != null)
{
_contentPosition = documentPaginator.GetPagePosition(masterPageView.DocumentPage);
}
if (_contentPosition == ContentPosition.Missing)
{
_contentPosition = null;
}
}
// Otherwise bring this position into view.
else
{
PrivateBringContentPositionIntoView(_contentPosition, true);
}
}
}
}
/// <summary>
/// Handler for GetPageNumberCompleted event raised by the Document.
/// </summary>
private void HandleGetPageNumberCompleted(object sender, GetPageNumberCompletedEventArgs e)
{
if (Document != null && sender == Document.DocumentPaginator && e != null)
{
if (!e.Cancelled && e.Error == null && e.UserState == _bringContentPositionIntoViewToken)
{
int newMasterPageNumber = e.PageNumber + 1;
OnGoToPageCommand(newMasterPageNumber);
}
}
}
/// <summary>
/// Handler for BreakRecordTableInvalidated event raised by the Paginator.
/// </summary>
private void HandleAllBreakRecordsInvalidated(object sender, EventArgs e)
{
ReadOnlyCollection<DocumentPageView> pageViews = PageViews;
for (int index = 0; index < pageViews.Count; index++)
{
pageViews[index].DuplicateVisual();
}
}
/// <summary>
/// Handle the case when the position is no longer valid for the current document, conservatively returns true if
/// is uknown.
/// </summary>
private bool IsValidContentPositionForDocument(IDocumentPaginatorSource document, ContentPosition contentPosition)
{
FlowDocument flowDocument = document as FlowDocument;
TextPointer textPointer = contentPosition as TextPointer;
if(flowDocument != null && textPointer != null)
{
return flowDocument.ContentStart.TextContainer == textPointer.TextContainer;
}
return true;
}
/// <summary>
/// Bring specified content position into view. (If async, cancel any previous async request to bring into view.)
/// </summary>
private void PrivateBringContentPositionIntoView(object arg, bool isAsyncRequest)
{
ContentPosition contentPosition = arg as ContentPosition;
if (contentPosition != null && Document != null)
{
DynamicDocumentPaginator documentPaginator = this.Document.DocumentPaginator as DynamicDocumentPaginator;
if (documentPaginator != null && IsValidContentPositionForDocument(Document, contentPosition))
{
documentPaginator.CancelAsync(_bringContentPositionIntoViewToken);
if(isAsyncRequest)
{
documentPaginator.GetPageNumberAsync(contentPosition, _bringContentPositionIntoViewToken);
}
else
{
int newMasterPageNumber = documentPaginator.GetPageNumber(contentPosition) + 1;
OnGoToPageCommand(newMasterPageNumber);
}
_contentPosition = contentPosition;
}
}
}
/// <summary>
/// Called when WritingCompleted event raised by a DocumentWriter (during printing).
/// </summary>
/// <param name="sender">Sender of the event.</param>
/// <param name="e">Event arguments.</param>
private void HandlePrintCompleted(object sender, WritingCompletedEventArgs e)
{
OnPrintCompleted();
}
/// <summary>
/// Called when WritingCancelled event raised by a DocumentWriter (during printing).
/// </summary>
/// <param name="sender">Sender of the event.</param>
/// <param name="e">Event arguments.</param>
private void HandlePrintCancelled(object sender, WritingCancelledEventArgs e)
{
ClearPrintingState();
}
/// <summary>
/// Clears printing state.
/// </summary>
private void ClearPrintingState()
{
#if !DONOTREFPRINTINGASMMETA
if (_printingState != null)
{
// Resume layout on DocumentPageViews.
ReadOnlyCollection<DocumentPageView> pageViews = PageViews;
for (int index = 0; index < pageViews.Count; index++)
{
pageViews[index].ResumeLayout();
}
// Enable TextSelection, if it was previously enabled.
if (_printingState.IsSelectionEnabled)
{
IsSelectionEnabled = true;
}
// Remove PreviewCanExecute handler (added when Print command was executed).
CommandManager.RemovePreviewCanExecuteHandler(this, new CanExecuteRoutedEventHandler(PreviewCanExecuteRoutedEventHandler));
// Unregister for XpsDocumentWriter events.
_printingState.XpsDocumentWriter.WritingCompleted -= new WritingCompletedEventHandler(HandlePrintCompleted);
_printingState.XpsDocumentWriter.WritingCancelled -= new WritingCancelledEventHandler(HandlePrintCancelled);
// Restore old page metrics on FlowDocument.
((FlowDocument)Document).PagePadding = _printingState.PagePadding;
Document.DocumentPaginator.PageSize = _printingState.PageSize;
_printingState = null;
// Since _documentWriter value is used to determine CanExecute state, we must invalidate that state.
CommandManager.InvalidateRequerySuggested();
}
#endif // DONOTREFPRINTINGASMMETA
}
/// <summary>
/// Apply zoom value to all existing DocumentPageViews.
/// </summary>
private void ApplyZoom()
{
int index;
ReadOnlyCollection<DocumentPageView> pageViews;
// Apply zoom value to all DocumentPageViews.
pageViews = this.PageViews;
for (index = 0; index < pageViews.Count; index++)
{
pageViews[index].SetPageZoom(Zoom / 100.0);
}
}
/// <summary>
/// Enables/disables the FindToolbar.
/// </summary>
/// <param name="enable">Whether to enable/disable FindToolBar.</param>
private void ToggleFindToolBar(bool enable)
{
Invariant.Assert(enable == (FindToolBar == null));
DocumentViewerHelper.ToggleFindToolBar(_findToolBarHost, new EventHandler(OnFindInvoked), enable);
}
/// <summary>
/// Invoked when the "Find" button in the Find Toolbar is clicked.
/// This method invokes the actual Find process.
/// </summary>
/// <param name="sender">The object that sent this event</param>
/// <param name="e">The Click Events associated with this event</param>
private void OnFindInvoked(object sender, EventArgs e)
{
ITextRange findResult;
int newMasterPageNumber;
FindToolBar findToolBar = FindToolBar;
if (findToolBar != null && this.TextEditor != null)
{
// In order to show current text selection TextEditor requires Focus to be set on the UIScope.
// If there embedded controls, it may happen that embedded control currently has focus and find
// was invoked through hotkeys. To support this case we manually move focus to the appropriate element.
Focus();
findResult = Find(findToolBar);
// If we found something, bring it into the view. Otherwise alert the user.
if ((findResult != null) && (!findResult.IsEmpty))
{
if (findResult.Start is ContentPosition)
{
// Bring find result into view. Set also _contentPosition to the beginning of the
// result, so it is visible during resizing.
_contentPosition = (ContentPosition)findResult.Start;
newMasterPageNumber = ((DynamicDocumentPaginator)this.Document.DocumentPaginator).GetPageNumber(_contentPosition) + 1;
OnBringIntoView(this, Rect.Empty, newMasterPageNumber);
}
}
else
{
DocumentViewerHelper.ShowFindUnsuccessfulMessage(findToolBar);
}
}
}
/// <summary>
/// The Zoom has changed and needs to be updated.
/// </summary>
private void ZoomChanged(double oldValue, double newValue)
{
if (!DoubleUtil.AreClose(oldValue, newValue))
{
UpdateCanIncreaseZoom();
UpdateCanDecreaseZoom();
// Changes to Zoom may potentially cause content reflowing.
// In such case Paginator will notify DocumentViewerBase
// about content changes through PagesChanged event and viewer
// will invalidate appropriate properties.
// Hence there is no need to invalidate any properties on
// DocumentViewerBase right now.
ApplyZoom();
}
}
/// <summary>
/// Update CanIncreaseZoom property.
/// </summary>
private void UpdateCanIncreaseZoom()
{
SetValue(CanIncreaseZoomPropertyKey, BooleanBoxes.Box(DoubleUtil.GreaterThan(MaxZoom, Zoom)));
}
/// <summary>
/// Update CanDecreaseZoom property.
/// </summary>
private void UpdateCanDecreaseZoom()
{
SetValue(CanDecreaseZoomPropertyKey, BooleanBoxes.Box(DoubleUtil.LessThan(MinZoom, Zoom)));
}
/// <summary>
/// The MaxZoom has changed and needs to be updated.
/// </summary>
private void MaxZoomChanged(double oldValue, double newValue)
{
CoerceValue(ZoomProperty);
UpdateCanIncreaseZoom();
}
/// <summary>
/// The MinZoom has changed and needs to be updated.
/// </summary>
private void MinZoomChanged(double oldValue, double newValue)
{
CoerceValue(MaxZoomProperty);
CoerceValue(ZoomProperty);
UpdateCanIncreaseZoom();
UpdateCanDecreaseZoom();
}
#region Commands
/// <summary>
/// Set up Command and RoutedCommand bindings.
/// </summary>
private static void CreateCommandBindings()
{
ExecutedRoutedEventHandler executedHandler;
CanExecuteRoutedEventHandler canExecuteHandler;
// Create our generic ExecutedRoutedEventHandler.
executedHandler = new ExecutedRoutedEventHandler(ExecutedRoutedEventHandler);
// Create our generic CanExecuteRoutedEventHandler
canExecuteHandler = new CanExecuteRoutedEventHandler(CanExecuteRoutedEventHandler);
// Command: ApplicationCommands.Find
CommandHelpers.RegisterCommandHandler(typeof(FlowDocumentPageViewer), ApplicationCommands.Find,
executedHandler, canExecuteHandler);
// Command: NavigationCommands.IncreaseZoom
CommandHelpers.RegisterCommandHandler(typeof(FlowDocumentPageViewer), NavigationCommands.IncreaseZoom,
executedHandler, canExecuteHandler, new KeyGesture(Key.OemPlus, ModifierKeys.Control));
// Command: NavigationCommands.DecreaseZoom
CommandHelpers.RegisterCommandHandler(typeof(FlowDocumentPageViewer), NavigationCommands.DecreaseZoom,
executedHandler, canExecuteHandler, new KeyGesture(Key.OemMinus, ModifierKeys.Control));
// Register input bindings
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.PreviousPage, new KeyGesture(Key.Left)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.PreviousPage, new KeyGesture(Key.Up)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.PreviousPage, new KeyGesture(Key.PageUp)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.NextPage, new KeyGesture(Key.Right)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.NextPage, new KeyGesture(Key.Down)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.NextPage, new KeyGesture(Key.PageDown)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.FirstPage, new KeyGesture(Key.Home)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.FirstPage, new KeyGesture(Key.Home, ModifierKeys.Control)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.LastPage, new KeyGesture(Key.End)));
CommandManager.RegisterClassInputBinding(typeof(FlowDocumentPageViewer), new InputBinding(NavigationCommands.LastPage, new KeyGesture(Key.End, ModifierKeys.Control)));
}
/// <summary>
/// Central handler for CanExecuteRouted events fired by Commands directed at FlowDocumentPageViewer.
/// </summary>
/// <param name="target">The target of this Command, expected to be FlowDocumentPageViewer</param>
/// <param name="args">The event arguments for this event.</param>
private static void CanExecuteRoutedEventHandler(object target, CanExecuteRoutedEventArgs args)
{
FlowDocumentPageViewer fdpv = target as FlowDocumentPageViewer;
Invariant.Assert(fdpv != null, "Target of QueryEnabledEvent must be FlowDocumentPageViewer.");
Invariant.Assert(args != null, "args cannot be null.");
// DocumentViewerBase is capable of execution of the majority of its commands.
// Special rules:
// a) Find command is enabled when Document is attached and printing is not in progress.
if (args.Command == ApplicationCommands.Find)
{
args.CanExecute = fdpv.CanShowFindToolBar;
}
else
{
args.CanExecute = true;
}
}
/// <summary>
/// Central handler for all ExecutedRouted events fired by Commands directed at FlowDocumentPageViewer.
/// </summary>
/// <param name="target">The target of this Command, expected to be FlowDocumentPageViewer.</param>
/// <param name="args">The event arguments associated with this event.</param>
private static void ExecutedRoutedEventHandler(object target, ExecutedRoutedEventArgs args)
{
FlowDocumentPageViewer fdpv = target as FlowDocumentPageViewer;
Invariant.Assert(fdpv != null, "Target of ExecuteEvent must be FlowDocumentPageViewer.");
Invariant.Assert(args != null, "args cannot be null.");
// Now we execute the method corresponding to the Command that fired this event;
// each Command has its own protected virtual method that performs the operation
// corresponding to the Command.
if (args.Command == NavigationCommands.IncreaseZoom)
{
fdpv.OnIncreaseZoomCommand();
}
else if (args.Command == NavigationCommands.DecreaseZoom)
{
fdpv.OnDecreaseZoomCommand();
}
else if (args.Command == ApplicationCommands.Find)
{
fdpv.OnFindCommand();
}
else
{
Invariant.Assert(false, "Command not handled in ExecutedRoutedEventHandler.");
}
}
/// <summary>
/// Disable commands on DocumentViewerBase when this printing is in progress.
/// </summary>
private void PreviewCanExecuteRoutedEventHandler(object target, CanExecuteRoutedEventArgs args)
{
FlowDocumentPageViewer fdpv = target as FlowDocumentPageViewer;
Invariant.Assert(fdpv != null, "Target of PreviewCanExecuteRoutedEventHandler must be FlowDocumentPageViewer.");
Invariant.Assert(args != null, "args cannot be null.");
// Disable UI commands, if printing is in progress.
if (fdpv._printingState != null)
{
if (args.Command != ApplicationCommands.CancelPrint)
{
args.CanExecute = false;
args.Handled = true;
}
}
}
/// <summary>
/// Called when a key event occurs.
/// </summary>
private static void KeyDownHandler(object sender, KeyEventArgs e)
{
DocumentViewerHelper.KeyDownHelper(e, ((FlowDocumentPageViewer)sender)._findToolBarHost);
}
#endregion Commands
#region Static Methods
/// <summary>
/// Coerce the value for Zoom property.
/// </summary>
private static object CoerceZoom(DependencyObject d, object value)
{
Invariant.Assert(d != null && d is FlowDocumentPageViewer);
double maxZoom, minZoom;
FlowDocumentPageViewer v = (FlowDocumentPageViewer) d;
double zoom = (double)value;
maxZoom = v.MaxZoom;
if (DoubleUtil.LessThan(maxZoom, zoom))
{
return maxZoom;
}
minZoom = v.MinZoom;
if (DoubleUtil.GreaterThan(minZoom, zoom))
{
return minZoom;
}
return value;
}
/// <summary>
/// Coerce the value for MaxZoom property.
/// </summary>
private static object CoerceMaxZoom(DependencyObject d, object value)
{
Invariant.Assert(d != null && d is FlowDocumentPageViewer);
FlowDocumentPageViewer v = (FlowDocumentPageViewer) d;
double minZoom = v.MinZoom;
if (DoubleUtil.LessThan((double)value, minZoom))
{
return minZoom;
}
return value;
}
/// <summary>
/// The Zoom has changed and needs to be updated.
/// </summary>
private static void ZoomChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Invariant.Assert(d != null && d is FlowDocumentPageViewer);
((FlowDocumentPageViewer)d).ZoomChanged((double) e.OldValue, (double) e.NewValue);
}
/// <summary>
/// The MaxZoom has changed and needs to be updated.
/// </summary>
private static void MaxZoomChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Invariant.Assert(d != null && d is FlowDocumentPageViewer);
((FlowDocumentPageViewer)d).MaxZoomChanged((double) e.OldValue, (double) e.NewValue);
}
/// <summary>
/// The MinZoom has changed and needs to be updated.
/// </summary>
private static void MinZoomChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Invariant.Assert(d != null && d is FlowDocumentPageViewer);
((FlowDocumentPageViewer)d).MinZoomChanged((double) e.OldValue, (double) e.NewValue);
}
/// <summary>
/// Validate Zoom, MaxZoom, MinZoom and ZoomIncrement value.
/// </summary>
/// <param name="o">Value to validate.</param>
/// <returns>True if the value is valid, false otherwise.</returns>
private static bool ZoomValidateValue(object o)
{
double value = (double)o;
return (!Double.IsNaN(value) && !Double.IsInfinity(value) && DoubleUtil.GreaterThanZero(value));
}
/// <summary>
/// PropertyChanged callback for a property that affects the selection or caret rendering.
/// </summary>
private static void UpdateCaretElement(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FlowDocumentPageViewer viewer = (FlowDocumentPageViewer)d;
if (viewer.Selection != null)
{
CaretElement caretElement = viewer.Selection.CaretElement;
if (caretElement != null)
{
caretElement.InvalidateVisual();
}
}
}
#endregion Static Methods
#endregion Private Methods
//-------------------------------------------------------------------
//
// Private Properties
//
//-------------------------------------------------------------------
#region Private Properties
/// <summary>
/// Returns FindToolBar, if enabled.
/// </summary>
private FindToolBar FindToolBar
{
get { return (_findToolBarHost != null) ? _findToolBarHost.Child as FindToolBar : null; }
}
#endregion Private Properties
//-------------------------------------------------------------------
//
// Private Fields
//
//-------------------------------------------------------------------
#region Private Fields
private Decorator _findToolBarHost; // Host for FindToolbar
private ContentPosition _contentPosition; // Current position to be maintained during zooming and resizing.
private FlowDocumentPrintingState _printingState; // Printing state
private IDocumentPaginatorSource _oldDocument; // IDocumentPaginatorSource representing Document. Cached separately from DocumentViewerBase
// due to lifetime issues.
private object _bringContentPositionIntoViewToken = new object(); // Bring content position into view user state
private const string _findToolBarHostTemplateName = "PART_FindToolBarHost"; //Name for the Find Toolbar host.
#endregion Private Fields
//-------------------------------------------------------------------
//
// IJournalState Members
//
//-------------------------------------------------------------------
#region IJournalState Members
[Serializable]
private class JournalState : CustomJournalStateInternal
{
public JournalState(int contentPosition, LogicalDirection contentPositionDirection, double zoom)
{
ContentPosition = contentPosition;
ContentPositionDirection = contentPositionDirection;
Zoom = zoom;
}
public int ContentPosition;
public LogicalDirection ContentPositionDirection;
public double Zoom;
}
/// <summary>
/// <see cref="IJournalState.GetJournalState"/>
/// </summary>
CustomJournalStateInternal IJournalState.GetJournalState(JournalReason journalReason)
{
int cp = -1;
LogicalDirection cpDirection = LogicalDirection.Forward;
TextPointer contentPosition = ContentPosition as TextPointer;
if (contentPosition != null)
{
cp = contentPosition.Offset;
cpDirection = contentPosition.LogicalDirection;
}
return new JournalState(cp, cpDirection, Zoom);
}
/// <summary>
/// <see cref="IJournalState.RestoreJournalState"/>
/// </summary>
void IJournalState.RestoreJournalState(CustomJournalStateInternal state)
{
JournalState viewerState = state as JournalState;
if (state != null)
{
SetCurrentValueInternal(ZoomProperty, viewerState.Zoom);
if (viewerState.ContentPosition != -1)
{
FlowDocument document = Document as FlowDocument;
if (document != null)
{
TextContainer textContainer = document.StructuralCache.TextContainer;
if (viewerState.ContentPosition <= textContainer.SymbolCount)
{
TextPointer contentPosition = textContainer.CreatePointerAtOffset(viewerState.ContentPosition, viewerState.ContentPositionDirection);
// This need be called because the UI may not be ready when Contentposition is set.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(BringContentPositionIntoView), contentPosition);
}
}
}
}
}
#endregion IJournalState Members
//-------------------------------------------------------------------
//
// DTypeThemeStyleKey
//
//-------------------------------------------------------------------
#region DTypeThemeStyleKey
/// <summary>
/// Returns the DependencyObjectType for the registered ThemeStyleKey's default
/// value. Controls will override this method to return approriate types
/// </summary>
internal override DependencyObjectType DTypeThemeStyleKey
{
get { return _dType; }
}
private static DependencyObjectType _dType;
#endregion DTypeThemeStyleKey
}
}
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