Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Ink / InkCanvasSelection.cs / 1 / InkCanvasSelection.cs
//----------------------------------------------------------------------------
//
// File: InkCanvasSelection.cs
//
// Description:
// Element that represents InkCanvas selection
//
// History:
// 9/01/2004 [....]: Created
//
// Copyright (C) 2003 by Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using MS.Utility;
using MS.Internal;
using MS.Internal.Controls;
using MS.Internal.Ink;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows;
using System.Windows.Media;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Controls;
using System.Windows.Markup;
using System.Windows.Threading;
namespace MS.Internal.Ink
{
///
/// InkCanvasSelection
///
internal sealed class InkCanvasSelection
{
//-------------------------------------------------------------------------------
//
// Constructors
//
//-------------------------------------------------------------------------------
#region Constructors
///
/// InkCanvasSelection has an internal constructor to prevent direct instantiation
///
/// inkCanvas
internal InkCanvasSelection(InkCanvas inkCanvas)
{
//validate
if (inkCanvas == null)
{
throw new ArgumentNullException("inkCanvas");
}
_inkCanvas = inkCanvas;
_inkCanvas.FeedbackAdorner.UpdateBounds(Rect.Empty);
}
#endregion Constructors
//--------------------------------------------------------------------------------
//
// Internal Properties
//
//-------------------------------------------------------------------------------
#region Internal Properties
///
/// Returns the collection of selected strokes
///
internal StrokeCollection SelectedStrokes
{
get
{
if ( _selectedStrokes == null )
{
_selectedStrokes = new StrokeCollection();
_areStrokesChanged = true;
}
return _selectedStrokes;
}
}
///
/// Returns the collection of selected elements
///
internal ReadOnlyCollection SelectedElements
{
get
{
if ( _selectedElements == null )
{
_selectedElements = new List();
}
return new ReadOnlyCollection(_selectedElements);
}
}
///
/// Indicates whether there is a selection in the current InkCanvas.
///
internal bool HasSelection
{
get
{
return SelectedStrokes.Count != 0 || SelectedElements.Count != 0;
}
}
///
/// Returns the selection bounds
///
internal Rect SelectionBounds
{
get
{
return Rect.Union(GetStrokesBounds(), GetElementsUnionBounds());
}
}
#endregion Internal Properties
//--------------------------------------------------------------------------------
//
// Internal Methods
//
//--------------------------------------------------------------------------------
#region Internal Methods
///
/// Start a feedback rubberband.
/// This method is called from SelectionEditingBehavior.OnActivated
///
///
///
internal void StartFeedbackAdorner(Rect feedbackRect, InkCanvasSelectionHitResult activeSelectionHitResult)
{
Debug.Assert( _inkCanvas.EditingCoordinator.UserIsEditing == true );
Debug.Assert(activeSelectionHitResult != InkCanvasSelectionHitResult.None, "activeSelectionHitResult cannot be InkCanvasSelectionHitResult.None.");
_activeSelectionHitResult = activeSelectionHitResult;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(_inkCanvas.InnerCanvas);
// Until the next start, we are going to use this adorner regardless user will change feedback adorner or not during the editing.
InkCanvasFeedbackAdorner feedbackAdorner = _inkCanvas.FeedbackAdorner;
// The feedback adorner shouldn't have been connected to the adorner layer yet.
Debug.Assert(VisualTreeHelper.GetParent(feedbackAdorner) == null,
"feedbackAdorner shouldn't be added to tree.");
// Now, attach the feedback adorner to the adorner layer. Then update its bounds
adornerLayer.Add(feedbackAdorner);
feedbackAdorner.UpdateBounds(feedbackRect);
}
///
/// This method updates the feedback rubberband.
/// This method is called from SelectionEditingBehavior.OnMouseMove.
///
///
internal void UpdateFeedbackAdorner(Rect feedbackRect)
{
Debug.Assert(VisualTreeHelper.GetParent(_inkCanvas.FeedbackAdorner)
== AdornerLayer.GetAdornerLayer(_inkCanvas.InnerCanvas),
"feedbackAdorner should have been added to tree.");
// Update the feedback bounds
_inkCanvas.FeedbackAdorner.UpdateBounds(feedbackRect);
}
///
/// Ends a feedback rubberband
/// This method is called from SelectionEditingBehavior.OnMoveUp
///
///
internal void EndFeedbackAdorner(Rect finalRectangle)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(_inkCanvas.InnerCanvas);
InkCanvasFeedbackAdorner feedbackAdorner = _inkCanvas.FeedbackAdorner;
Debug.Assert(VisualTreeHelper.GetParent(feedbackAdorner) == adornerLayer,
"feedbackAdorner should have been added to tree.");
// Reset the feedback bounds and detach it from the adorner layer.
feedbackAdorner.UpdateBounds(Rect.Empty);
adornerLayer.Remove(feedbackAdorner);
// Commit the new rectange of the selection.
CommitChanges(finalRectangle, true);
_activeSelectionHitResult = null;
}
///
/// Set the new selection to this helper class.
///
///
///
///
internal void Select(StrokeCollection strokes, IList elements, bool raiseSelectionChanged)
{
// Can't be null.
Debug.Assert(strokes != null && elements != null);
//
// check to see if we're different. If not, there is no need to raise the changed event
//
bool strokesAreDifferent;
bool elementsAreDifferent;
int count = 0;
SelectionIsDifferentThanCurrent(strokes, out strokesAreDifferent, elements, out elementsAreDifferent);
// Besides the differences of both the stroks and the elements, there is a chance that the selected strokes and elements
// have been removed from the InkCanvas. Meanwhile, we may still hold the reference of _inkCanvasSelection which is empty.
// So, we should make sure to remove _inkCanvasSelection in this case.
if ( strokesAreDifferent || elementsAreDifferent )
{
if ( strokesAreDifferent && SelectedStrokes.Count != 0 )
{
// PERF-2006/05/02-[....],
// Unsubscribe the event fisrt so that reseting IsSelected won't call into our handler.
//
// quit listening to changes
//
QuitListeningToStrokeChanges();
count = SelectedStrokes.Count;
for ( int i = 0; i < count; i++ )
{
SelectedStrokes[i].IsSelected = false;
}
}
_selectedStrokes = strokes;
_areStrokesChanged = true;
_selectedElements = new List(elements);
// PERF-2006/05/02-[....],
// Update IsSelected property before adding the event handlers.
//
if ( _inkCanvas.ActiveEditingMode == InkCanvasEditingMode.Select )
{
//
count = strokes.Count;
for ( int i = 0; i < count; i++ )
{
strokes[i].IsSelected = true;
}
}
// Add a LayoutUpdated handler if it's necessary.
UpdateCanvasLayoutUpdatedHandler();
// Update our selection adorner manually
UpdateSelectionAdorner();
ListenToStrokeChanges();
//
// And finally... raise the SelectionChanged event
//
if ( raiseSelectionChanged )
{
_inkCanvas.RaiseSelectionChanged(EventArgs.Empty);
}
}
}
///
/// Our internal method to commit the current editing.
/// Called by EndFeedbackAdorner or InkCanvas.PasteFromDataObject
///
internal void CommitChanges(Rect finalRectangle, bool raiseEvent)
{
// The follow moving or resizing raises SelectionMove or SelectionResize event
// The out-side code could throw exception in the their handlers. We use try/finally block to protect our status.
Rect selectionBounds = SelectionBounds;
//
if ( selectionBounds.IsEmpty )
{
return;
}
try
{
QuitListeningToStrokeChanges( );
if ( raiseEvent )
{
//
// see if we resized
//
if ( !DoubleUtil.AreClose(finalRectangle.Height, selectionBounds.Height)
|| !DoubleUtil.AreClose(finalRectangle.Width, selectionBounds.Width) )
{
//
// we resized
//
CommitResizeChange(finalRectangle);
}
else if ( !DoubleUtil.AreClose(finalRectangle.Top, selectionBounds.Top)
|| !DoubleUtil.AreClose(finalRectangle.Left, selectionBounds.Left) )
{
//
// we moved
//
CommitMoveChange(finalRectangle);
}
}
else
{
//
// Just perform the move without raising any events.
//
MoveSelection(selectionBounds, finalRectangle);
}
}
finally
{
ListenToStrokeChanges( );
}
}
///
/// Try to remove an element from the selected elements list.
/// Called by:
/// OnCanvasLayoutUpdated
///
///
internal void RemoveElement(UIElement removedElement)
{
// No selected element. Bail out
if ( _selectedElements == null || _selectedElements.Count == 0 )
{
return;
}
if ( _selectedElements.Remove(removedElement) )
{
// The element existed and was removed successfully.
// Now if there is no selected element, we should remove our LayoutUpdated handler.
if ( _selectedElements.Count == 0 )
{
UpdateCanvasLayoutUpdatedHandler();
UpdateSelectionAdorner();
}
}
}
///
/// UpdateElementBounds:
/// Called by InkCanvasSelection.MoveSelection
///
///
///
internal void UpdateElementBounds(UIElement element, Matrix transform)
{
UpdateElementBounds(element, element, transform);
}
///
/// UpdateElementBounds:
/// Called by InkCanvasSelection.UpdateElementBounds
/// ClipboardProcessor.CopySelectionInXAML
///
///
///
///
internal void UpdateElementBounds(UIElement originalElement, UIElement updatedElement, Matrix transform)
{
if ( originalElement.DependencyObjectType.Id == updatedElement.DependencyObjectType.Id )
{
// Get the transform from element to Canvas
GeneralTransform elementToCanvas = originalElement.TransformToAncestor(_inkCanvas.InnerCanvas);
//cast to a FrameworkElement, nothing inherits from UIElement besides it right now
FrameworkElement frameworkElement = originalElement as FrameworkElement;
Size size;
Thickness thickness = new Thickness();
if ( frameworkElement == null )
{
// Get the element's render size.
size = originalElement.RenderSize;
}
else
{
size = new Size(frameworkElement.ActualWidth, frameworkElement.ActualHeight);
thickness = frameworkElement.Margin;
}
Rect elementBounds = new Rect(0, 0, size.Width, size.Height); // Rect in element space
elementBounds = elementToCanvas.TransformBounds(elementBounds); // Rect in Canvas space
// Now apply the matrix to the element bounds
Rect newBounds = Rect.Transform(elementBounds, transform);
if ( !DoubleUtil.AreClose(elementBounds.Width, newBounds.Width) )
{
if ( frameworkElement == null )
{
Size newSize = originalElement.RenderSize;
newSize.Width = newBounds.Width;
updatedElement.RenderSize = newSize;
}
else
{
((FrameworkElement)updatedElement).Width = newBounds.Width;
}
}
if ( !DoubleUtil.AreClose(elementBounds.Height, newBounds.Height) )
{
if ( frameworkElement == null )
{
Size newSize = originalElement.RenderSize;
newSize.Height = newBounds.Height;
updatedElement.RenderSize = newSize;
}
else
{
( (FrameworkElement)updatedElement ).Height = newBounds.Height;
}
}
double left = InkCanvas.GetLeft(originalElement);
double top = InkCanvas.GetTop(originalElement);
double right = InkCanvas.GetRight(originalElement);
double bottom = InkCanvas.GetBottom(originalElement);
Point originalPosition = new Point(); // Default as (0, 0)
if ( !double.IsNaN(left) )
{
originalPosition.X = left;
}
else if ( !double.IsNaN(right) )
{
originalPosition.X = right;
}
if ( !double.IsNaN(top) )
{
originalPosition.Y = top;
}
else if ( !double.IsNaN(bottom) )
{
originalPosition.Y = bottom;
}
Point newPosition = originalPosition * transform;
if ( !double.IsNaN(left) )
{
InkCanvas.SetLeft(updatedElement, newPosition.X - thickness.Left); // Left wasn't auto
}
else if ( !double.IsNaN(right) )
{
// NOTICE-2005/05/05-[....]
// Canvas.RightProperty means the distance between element right side and its parent Canvas
// right side. The same definition is applied to Canvas.BottomProperty
InkCanvas.SetRight(updatedElement, ( right - ( newPosition.X - originalPosition.X ) )); // Right wasn't not auto
}
else
{
InkCanvas.SetLeft(updatedElement, newPosition.X - thickness.Left); // Both Left and Right were aut. Modify Left by default.
}
if ( !double.IsNaN(top) )
{
InkCanvas.SetTop(updatedElement, newPosition.Y - thickness.Top); // Top wasn't auto
}
else if ( !double.IsNaN(bottom) )
{
InkCanvas.SetBottom(updatedElement, ( bottom - ( newPosition.Y - originalPosition.Y ) )); // Bottom wasn't not auto
}
else
{
InkCanvas.SetTop(updatedElement, newPosition.Y - thickness.Top); // Both Top and Bottom were aut. Modify Left by default.
}
}
else
{
Debug.Assert(false, "The updatedElement has to be the same type as the originalElement.");
}
}
internal void TransformStrokes(StrokeCollection strokes, Matrix matrix)
{
strokes.Transform(matrix, false /*Don't apply the transform to StylusTip*/);
}
internal InkCanvasSelectionHitResult HitTestSelection(Point pointOnInkCanvas)
{
// If Selection is moving or resizing now, we should returns the active hit result.
if ( _activeSelectionHitResult.HasValue )
{
return _activeSelectionHitResult.Value;
}
// No selection at all. Just return None.
if ( !HasSelection )
{
return InkCanvasSelectionHitResult.None;
}
// Get the transform from InkCanvas to SelectionAdorner
GeneralTransform inkCanvasToSelectionAdorner = _inkCanvas.TransformToDescendant(_inkCanvas.SelectionAdorner);
Point pointOnSelectionAdorner = inkCanvasToSelectionAdorner.Transform(pointOnInkCanvas);
InkCanvasSelectionHitResult hitResult = _inkCanvas.SelectionAdorner.SelectionHandleHitTest(pointOnSelectionAdorner);
// If the hit test returns Selection and there is one and only one element is selected.
// We have to check whether we hit on inside the element.
if ( hitResult == InkCanvasSelectionHitResult.Selection
&& SelectedElements.Count == 1
&& SelectedStrokes.Count == 0 )
{
GeneralTransform transformToInnerCanvas = _inkCanvas.TransformToDescendant(_inkCanvas.InnerCanvas);
Point pointOnInnerCanvas = transformToInnerCanvas.Transform(pointOnInkCanvas);
// Try to find out whether we hit the single selement. If so, just return None.
if ( HasHitSingleSelectedElement(pointOnInnerCanvas) )
{
hitResult = InkCanvasSelectionHitResult.None;
}
}
return hitResult;
}
///
/// Private helper to used to determine if the current selection
/// is different than the selection passed
///
/// strokes
/// strokesAreDifferent
/// elements
/// elementsAreDifferent
internal void SelectionIsDifferentThanCurrent(StrokeCollection strokes,
out bool strokesAreDifferent,
IList elements,
out bool elementsAreDifferent)
{
strokesAreDifferent = false;
elementsAreDifferent = false;
if ( SelectedStrokes.Count == 0 )
{
if ( strokes.Count > 0 )
{
strokesAreDifferent = true;
}
}
else if ( !InkCanvasSelection.StrokesAreEqual(SelectedStrokes, strokes) )
{
strokesAreDifferent = true;
}
if ( SelectedElements.Count == 0 )
{
if ( elements.Count > 0 )
{
elementsAreDifferent = true;
}
}
else if ( !InkCanvasSelection.FrameworkElementArraysAreEqual(elements, SelectedElements) )
{
elementsAreDifferent = true;
}
}
#endregion Internal Methods
//-------------------------------------------------------------------------------
//
// Private Methods
//
//--------------------------------------------------------------------------------
#region Private Methods
///
/// HasHitSingleSelectedElement
/// This method hits test against the current selection. If the point is inside the single selected element,
/// it will return true. Otherwise, return false.
///
///
/// enumerator = SelectedElementsBoundsEnumerator.GetEnumerator();
if ( enumerator.MoveNext() )
{
Rect elementRect = enumerator.Current;
hasHit = elementRect.Contains(pointOnInnerCanvas);
}
else
{
Debug.Assert(false, "An unexpected single selected Element");
}
}
return hasHit;
}
///
/// Private helper to stop listening to stroke changes
///
private void QuitListeningToStrokeChanges()
{
if ( _inkCanvas.Strokes != null )
{
_inkCanvas.Strokes.StrokesChanged -= new StrokeCollectionChangedEventHandler(this.OnStrokeCollectionChanged);
}
foreach ( Stroke s in SelectedStrokes )
{
s.Invalidated -= new EventHandler(this.OnStrokeInvalidated);
}
}
///
/// Private helper to listen to stroke changes
///
private void ListenToStrokeChanges()
{
if ( _inkCanvas.Strokes != null )
{
_inkCanvas.Strokes.StrokesChanged += new StrokeCollectionChangedEventHandler(this.OnStrokeCollectionChanged);
}
foreach ( Stroke s in SelectedStrokes )
{
s.Invalidated += new EventHandler(this.OnStrokeInvalidated);
}
}
///
/// Helper method that take a finalRectangle and raised the appropriate
/// events on the InkCanvas. Handles cancellation
///
private void CommitMoveChange(Rect finalRectangle)
{
Rect selectionBounds = SelectionBounds;
//
//*** MOVED ***
//
InkCanvasSelectionEditingEventArgs args =
new InkCanvasSelectionEditingEventArgs(selectionBounds, finalRectangle);
_inkCanvas.RaiseSelectionMoving(args);
if ( !args.Cancel )
{
if ( finalRectangle != args.NewRectangle )
{
finalRectangle = args.NewRectangle;
}
//
// perform the move
//
MoveSelection(selectionBounds, finalRectangle);
//
// raise the 'changed' event
//
_inkCanvas.RaiseSelectionMoved(EventArgs.Empty);
}
}
///
/// Helper method that take a finalRectangle and raised the appropriate
/// events on the InkCanvas. Handles cancellation
///
private void CommitResizeChange(Rect finalRectangle)
{
Rect selectionBounds = SelectionBounds;
//
// *** RESIZED ***
//
InkCanvasSelectionEditingEventArgs args =
new InkCanvasSelectionEditingEventArgs(selectionBounds, finalRectangle);
_inkCanvas.RaiseSelectionResizing(args);
if ( !args.Cancel )
{
if ( finalRectangle != args.NewRectangle )
{
finalRectangle = args.NewRectangle;
}
//
// perform the move
//
MoveSelection(selectionBounds, finalRectangle);
//
// raise the 'changed' event
//
_inkCanvas.RaiseSelectionResized(EventArgs.Empty);
}
}
///
/// Private helper that moves all selected elements from the previous location
/// to the new one
///
///
///
private void MoveSelection(Rect previousRect, Rect newRect)
{
//
// compute our transform, but first remove our artificial border
//
Matrix matrix = InkCanvasSelection.MapRectToRect(newRect, previousRect);
//
// transform the elements
//
int count = SelectedElements.Count;
IList elements = SelectedElements;
for ( int i = 0; i < count ; i++ )
{
UpdateElementBounds(elements[i], matrix);
}
//
// transform the strokes
//
if ( SelectedStrokes.Count > 0 )
{
TransformStrokes(SelectedStrokes, matrix);
// Flag the change
_areStrokesChanged = true;
}
if ( SelectedElements.Count == 0 )
{
// If there is no element in the current selection, the inner canvas won't have layout changes.
// So there is no LayoutUpdated event. We have to manually update the selection bounds.
UpdateSelectionAdorner();
}
//
_inkCanvas.BringIntoView(newRect);
}
///
/// A handler which receives LayoutUpdated from the layout manager. Since the selected elements can be animated,
/// moved, resized or even removed programmatically from the InkCanvas, we have to monitor
/// the any layout changes caused by those actions.
///
///
///
private void OnCanvasLayoutUpdated(object sender, EventArgs e)
{
Debug.Assert( SelectedElements.Count != 0,
"The handler only can be hooked up when there are elements being selected" );
// Update the selection adorner when receive the layout changed
UpdateSelectionAdorner();
}
///
/// Our own internal listener for packet changes
///
private void OnStrokeInvalidated(object sender, EventArgs e)
{
OnStrokeCollectionChanged(sender,
new StrokeCollectionChangedEventArgs(new StrokeCollection(), new StrokeCollection()));
}
///
/// Our own internal listener for strokes changed.
/// This is used so that if someone deletes or modifies a stroke
/// we are currently displaying for selection, we can update our size
///
private void OnStrokeCollectionChanged(object target, StrokeCollectionChangedEventArgs e)
{
// If the strokes only get added to the InkCanvas, we don't have to update our internal selected strokes.
if ( e.Added.Count != 0 && e.Removed.Count == 0 )
{
return;
}
foreach (Stroke s in e.Removed)
{
if ( SelectedStrokes.Contains(s) )
{
s.Invalidated -= new EventHandler(this.OnStrokeInvalidated);
s.IsSelected = false;
// Now remove the stroke from our private collection.
SelectedStrokes.Remove(s);
}
}
// Mark the strokes change
_areStrokesChanged = true;
UpdateSelectionAdorner();
}
///
/// Get the cached bounding boxes to be updated.
///
private Rect GetStrokesBounds()
{
// Update the strokes bounds if they are changed.
if ( _areStrokesChanged )
{
_cachedStrokesBounds = SelectedStrokes.Count != 0 ?
SelectedStrokes.GetBounds( ) : Rect.Empty;
_areStrokesChanged = false;
}
return _cachedStrokesBounds;
}
///
/// Get the bounding boxes of the selected elements.
///
/// GetElementsBounds()
{
List rects = new List();
if ( SelectedElements.Count != 0 )
{
// The private SelectedElementsBounds property will ensure the size is got after rendering's done.
foreach ( Rect elementRect in SelectedElementsBoundsEnumerator )
{
rects.Add(elementRect);
}
}
return rects;
}
///
/// Get the union box of the selected elements.
///
///
/// Update the selection adorners state.
/// The method is called by:
/// MoveSelection
/// OnCanvasLayoutUpdated
/// OnStrokeCollectionChanged
/// RemoveElement
/// Select
///
private void UpdateSelectionAdorner()
{
// The Selection Adorner will be visible all the time unless the ActiveEditingMode is None.
if ( _inkCanvas.ActiveEditingMode != InkCanvasEditingMode.None )
{
Debug.Assert(_inkCanvas.SelectionAdorner.Visibility == Visibility.Visible,
"SelectionAdorner should be always visible except under the None ActiveEditingMode");
_inkCanvas.SelectionAdorner.UpdateSelectionWireFrame(GetStrokesBounds(), GetElementsBounds());
}
else
{
Debug.Assert(_inkCanvas.SelectionAdorner.Visibility == Visibility.Collapsed,
"SelectionAdorner should be collapsed except if the ActiveEditingMode is None");
}
}
///
/// Ensure the rendering is valid.
/// Called by:
/// SelectedElementsBounds
///
private void EnusreElementsBounds()
{
InkCanvasInnerCanvas innerCanvas = _inkCanvas.InnerCanvas;
// Make sure the arrange is valid. If not, we invoke UpdateLayout now.
if ( !innerCanvas.IsMeasureValid || !innerCanvas.IsArrangeValid )
{
innerCanvas.UpdateLayout();
}
}
///
/// Utility for computing a transformation that maps one rect to another
///
/// Destination Rectangle
/// Source Rectangle
/// Transform that maps source rectangle to destination rectangle
private static Matrix MapRectToRect(Rect target, Rect source)
{
if(source.IsEmpty)
throw new ArgumentOutOfRangeException("source", SR.Get(SRID.InvalidDiameter));
/*
In the horizontal direction:
M11*source.left + Dx = target.left
M11*source.right + Dx = target.right
Subtracting the equations yields:
M11*(source.right - source.left) = target.right - target.left
hence:
M11 = (target.right - target.left) / (source.right - source.left)
Having computed M11, solve the first equation for Dx:
Dx = target.left - M11*source.left
*/
double m11 = target.Width / source.Width;
double dx = target.Left - m11 * source.Left;
// Now do the same thing in the vertical direction
double m22 = target.Height / source.Height;
double dy = target.Top - m22 * source.Top;
/*
We are looking for the transformation that takes one upright rectangle to
another. This involves neither rotation nor shear, so:
*/
return new Matrix(m11, 0, 0, m22, dx, dy);
}
///
/// Adds/Removes the LayoutUpdated handler according to whether there is selected elements or not.
///
private void UpdateCanvasLayoutUpdatedHandler()
{
// If there are selected elements, we should create a LayoutUpdated handler in order to monitor their arrange changes.
// Otherwise, we don't have to listen the LayoutUpdated if there is no selected element at all.
if ( SelectedElements.Count != 0 )
{
// Make sure we hook up the event handler.
if ( _layoutUpdatedHandler == null )
{
_layoutUpdatedHandler = new EventHandler(OnCanvasLayoutUpdated);
_inkCanvas.InnerCanvas.LayoutUpdated += _layoutUpdatedHandler;
}
}
else
{
// Remove the handler if there is one.
if ( _layoutUpdatedHandler != null )
{
_inkCanvas.InnerCanvas.LayoutUpdated -= _layoutUpdatedHandler;
_layoutUpdatedHandler = null;
}
}
}
///
/// Private helper method used to determine if two stroke collection either
/// 1) are both null
/// or
/// 2) both refer to the identical set of strokes
///
private static bool StrokesAreEqual(StrokeCollection strokes1, StrokeCollection strokes2)
{
if ( strokes1 == null && strokes2 == null )
{
return true;
}
//
// we know that one of the stroke collections is
// not null. If the other one is, they're not
// equal
//
if ( strokes1 == null || strokes2 == null )
{
return false;
}
if ( strokes1.Count != strokes2.Count )
{
return false;
}
foreach ( Stroke s in strokes1 )
{
if ( !strokes2.Contains(s) )
{
return false;
}
}
return true;
}
///
/// Private helper method used to determine if two collection either
/// 1) are both null
/// or
/// 2) both refer to the identical set of elements
///
private static bool FrameworkElementArraysAreEqual(IList elements1, IList elements2)
{
if ( elements1 == null && elements2 == null )
{
return true;
}
//
// we know that one of the stroke collections is
// not null. If the other one is, they're not
// equal
//
if ( elements1 == null || elements2 == null )
{
return false;
}
if ( elements1.Count != elements2.Count )
{
return false;
}
foreach ( UIElement e in elements1 )
{
if ( !elements2.Contains(e) )
{
return false;
}
}
return true;
}
#endregion Private Methods
//-------------------------------------------------------------------------------
//
// Private Properties
//
//-------------------------------------------------------------------------------
#region Private Properties
///
/// Iterates the bounding boxes of the selected elements relevent to their parent (InnerCanvas)
///
private IEnumerable SelectedElementsBoundsEnumerator
{
get
{
// Ensure the elements have been rendered completely.
EnusreElementsBounds();
InkCanvasInnerCanvas innerCanvas = _inkCanvas.InnerCanvas;
foreach ( UIElement element in SelectedElements )
{
// Get the transform from element to Canvas
GeneralTransform elementToCanvas = element.TransformToAncestor(innerCanvas);
// Get the element's render size.
Size size = element.RenderSize;
Rect rect = new Rect(0, 0, size.Width, size.Height); // Rect in element space
rect = elementToCanvas.TransformBounds(rect); // Rect in Canvas space
yield return rect;
}
}
}
#endregion Private Properties
//-------------------------------------------------------------------------------
//
// Private Fields
//
//--------------------------------------------------------------------------------
#region Private Fields
///
/// Our logical parent.
///
private InkCanvas _inkCanvas;
///
/// The collection of strokes this selectedinkelement represents
///
private StrokeCollection _selectedStrokes;
///
/// The last known rectangle before the current edit. used to revert
/// when events are cancelled and expose the value to the InkCanvas.GetSelectionBounds
///
private Rect _cachedStrokesBounds;
private bool _areStrokesChanged;
///
/// The collection of elements this selectedinkelement represents
///
private List _selectedElements;
private EventHandler _layoutUpdatedHandler;
private Nullable _activeSelectionHitResult;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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