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//---------------------------------------------------------------------------
//
// File: ResizeEditingBehavior .cs
//
// Description:
// ResizeEditingBehavior
//
// Authors: samgeo
//
// Copyright (C) 2003 by Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Collections.Generic;
using System.Windows.Input;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Interop;
using System.Windows.Navigation;
using System.Windows.Media;
using System.Windows.Ink;
namespace MS.Internal.Ink
{
/// <summary>
/// SelectionEditingBehavior
/// </summary>
internal sealed class SelectionEditingBehavior : EditingBehavior
{
//-------------------------------------------------------------------------------
//
// Constructors
//
//-------------------------------------------------------------------------------
#region Constructors
/// <summary>
/// SelectionEditingBehavior constructor
/// </summary>
internal SelectionEditingBehavior(EditingCoordinator editingCoordinator, InkCanvas inkCanvas)
: base(editingCoordinator, inkCanvas)
{
}
#endregion Constructors
//-------------------------------------------------------------------------------
//
// Protected Methods
//
//-------------------------------------------------------------------------------
#region Protected Methods
/// <summary>
/// Attaching to the element, we get attached in StylusDown
/// </summary>
protected override void OnActivate()
{
_actionStarted = false;
// Capture the mouse.
InitializeCapture();
// Hittest for the grab handle
MouseDevice mouse = Mouse.PrimaryDevice;
_hitResult = InkCanvas.SelectionAdorner.SelectionHandleHitTest(
mouse.GetPosition((IInputElement)(InkCanvas.SelectionAdorner)));
Debug.Assert(_hitResult != InkCanvasSelectionHitResult.None);
EditingCoordinator.InvalidateBehaviorCursor(this);
// Get the current selection bounds.
_selectionRect = InkCanvas.GetSelectionBounds( );
// Set the initial tracking position and rectangle
_previousLocation = mouse.GetPosition(InkCanvas.SelectionAdorner);
_previousRect = _selectionRect;
// Start the feedback rubber band.
InkCanvas.InkCanvasSelection.StartFeedbackAdorner(_selectionRect, _hitResult);
// Add handlers to the mouse events.
InkCanvas.SelectionAdorner.AddHandler(Mouse.MouseUpEvent, new MouseButtonEventHandler(OnMouseUp));
InkCanvas.SelectionAdorner.AddHandler(Mouse.MouseMoveEvent, new MouseEventHandler(OnMouseMove));
InkCanvas.SelectionAdorner.AddHandler(UIElement.LostMouseCaptureEvent,
new MouseEventHandler(OnLostMouseCapture));
}
/// <summary>
/// Called when the ResizeEditingBehavior is detached
/// </summary>
protected override void OnDeactivate()
{
// Remove the mouse event handlers.
InkCanvas.SelectionAdorner.RemoveHandler(Mouse.MouseUpEvent, new MouseButtonEventHandler(OnMouseUp));
InkCanvas.SelectionAdorner.RemoveHandler(Mouse.MouseMoveEvent, new MouseEventHandler(OnMouseMove));
InkCanvas.SelectionAdorner.RemoveHandler(UIElement.LostMouseCaptureEvent,
new MouseEventHandler(OnLostMouseCapture));
}
protected override void OnCommit(bool commit)
{
// Release the inputs.
ReleaseCapture(true, commit);
}
protected override Cursor GetCurrentCursor()
{
return PenCursorManager.GetSelectionCursor(_hitResult,
(this.InkCanvas.FlowDirection == FlowDirection.RightToLeft));
}
#endregion Protected Methods
//-------------------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------------------
#region Private Methods
/// <summary>
/// The handler of the MouseMove event
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void OnMouseMove(object sender, MouseEventArgs args)
{
// Get the current mouse location.
Point curPoint = args.GetPosition(InkCanvas.SelectionAdorner);
// Check if we have a mouse movement at all.
if ( !DoubleUtil.AreClose(curPoint.X, _previousLocation.X)
|| !DoubleUtil.AreClose(curPoint.Y, _previousLocation.Y) )
{
// We won't start the move until we really see a movement.
if ( !_actionStarted )
{
_actionStarted = true;
}
// Get the new rectangle
Rect newRect = ChangeFeedbackRectangle(curPoint);
// Update the feedback rubber band and record the current tracking rectangle.
InkCanvas.InkCanvasSelection.UpdateFeedbackAdorner(newRect);
_previousRect = newRect;
}
}
/// <summary>
/// The handler of the MouseUp event
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void OnMouseUp(object sender, MouseButtonEventArgs args)
{
// We won't start the move until we really see a movement.
if ( _actionStarted )
{
_previousRect = ChangeFeedbackRectangle(args.GetPosition(InkCanvas.SelectionAdorner));
}
Commit(true);
}
/// <summary>
/// InkCanvas.LostStylusCapture handler
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void OnLostMouseCapture(object sender, MouseEventArgs args)
{
// If user is editing, we have to commit the current operation and reset our state.
if ( EditingCoordinator.UserIsEditing )
{
ReleaseCapture(false, true);
}
}
/// <summary>
/// Get the new feedback rectangle based on the location
/// </summary>
/// <param name="newPoint"></param>
private Rect ChangeFeedbackRectangle(Point newPoint)
{
// First check to make sure that we are not going past the zero point on
// the original element in which we hit the resize handle.
// If moving the left side -- don't go past the right side.
if ( _hitResult == InkCanvasSelectionHitResult.TopLeft ||
_hitResult == InkCanvasSelectionHitResult.BottomLeft ||
_hitResult == InkCanvasSelectionHitResult.Left )
{
if ( newPoint.X > _selectionRect.Right - MinimumHeightWidthSize )
{
newPoint.X = _selectionRect.Right - MinimumHeightWidthSize;
}
}
// If moving the right side -- don't go past the left side.
if ( _hitResult == InkCanvasSelectionHitResult.TopRight ||
_hitResult == InkCanvasSelectionHitResult.BottomRight ||
_hitResult == InkCanvasSelectionHitResult.Right )
{
if ( newPoint.X < _selectionRect.Left + MinimumHeightWidthSize )
{
newPoint.X = _selectionRect.Left + MinimumHeightWidthSize;
}
}
// If moving the top side -- don't go past the bottom side.
if ( _hitResult == InkCanvasSelectionHitResult.TopLeft ||
_hitResult == InkCanvasSelectionHitResult.TopRight ||
_hitResult == InkCanvasSelectionHitResult.Top )
{
if ( newPoint.Y > _selectionRect.Bottom - MinimumHeightWidthSize )
{
newPoint.Y = _selectionRect.Bottom - MinimumHeightWidthSize;
}
}
// If moving the bottom side -- don't go past the top side.
if ( _hitResult == InkCanvasSelectionHitResult.BottomLeft ||
_hitResult == InkCanvasSelectionHitResult.BottomRight ||
_hitResult == InkCanvasSelectionHitResult.Bottom )
{
if ( newPoint.Y < _selectionRect.Top + MinimumHeightWidthSize )
{
newPoint.Y = _selectionRect.Top + MinimumHeightWidthSize;
}
}
// Get the new boundary of the selection
Rect newRect = CalculateRect(newPoint.X - _previousLocation.X, newPoint.Y - _previousLocation.Y);
// Depends on the current grab handle, we record the tracking position accordingly.
if ( _hitResult == InkCanvasSelectionHitResult.BottomRight ||
_hitResult == InkCanvasSelectionHitResult.BottomLeft ||
_hitResult == InkCanvasSelectionHitResult.TopRight ||
_hitResult == InkCanvasSelectionHitResult.TopLeft ||
_hitResult == InkCanvasSelectionHitResult.Selection )
{
_previousLocation.X = newPoint.X;
_previousLocation.Y = newPoint.Y;
}
else if ( _hitResult == InkCanvasSelectionHitResult.Left ||
_hitResult == InkCanvasSelectionHitResult.Right )
{
_previousLocation.X = newPoint.X;
}
else if ( _hitResult == InkCanvasSelectionHitResult.Top ||
_hitResult == InkCanvasSelectionHitResult.Bottom )
{
_previousLocation.Y = newPoint.Y;
}
return newRect;
}
/// <summary>
/// Resize a given element based on the grab handle
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
private Rect CalculateRect(double x, double y)
{
Rect newRect = _previousRect;
switch ( _hitResult )
{
case InkCanvasSelectionHitResult.BottomRight:
{
newRect = ExtendSelectionRight(newRect, x);
newRect = ExtendSelectionBottom(newRect, y);
break;
}
case InkCanvasSelectionHitResult.Bottom:
{
newRect = ExtendSelectionBottom(newRect, y);
break;
}
case InkCanvasSelectionHitResult.BottomLeft:
{
newRect = ExtendSelectionLeft(newRect, x);
newRect = ExtendSelectionBottom(newRect, y);
break;
}
case InkCanvasSelectionHitResult.TopRight:
{
newRect = ExtendSelectionTop(newRect, y);
newRect = ExtendSelectionRight(newRect, x);
break;
}
case InkCanvasSelectionHitResult.Top:
{
newRect = ExtendSelectionTop(newRect, y);
break;
}
case InkCanvasSelectionHitResult.TopLeft:
{
newRect = ExtendSelectionTop(newRect, y);
newRect = ExtendSelectionLeft(newRect, x);
break;
}
case InkCanvasSelectionHitResult.Left:
{
newRect = ExtendSelectionLeft(newRect, x);
break;
}
case InkCanvasSelectionHitResult.Right:
{
newRect = ExtendSelectionRight(newRect, x);
break;
}
case InkCanvasSelectionHitResult.Selection:
{
// Translate the rectangle
newRect.Offset(x, y);
break;
}
default:
{
Debug.Assert(false);
break;
}
}
return newRect;
}
// ExtendSelectionLeft
private static Rect ExtendSelectionLeft(Rect rect, double extendBy)
{
Rect newRect = rect;
newRect.X += extendBy;
newRect.Width -= extendBy;
return newRect;
}
// ExtendSelectionTop
private static Rect ExtendSelectionTop(Rect rect, double extendBy)
{
Rect newRect = rect;
newRect.Y += extendBy;
newRect.Height -= extendBy;
return newRect;
}
// ExtendSelectionRight
private static Rect ExtendSelectionRight(Rect rect, double extendBy)
{
Rect newRect = rect;
newRect.Width += extendBy;
return newRect;
}
// ExtendSelectionBottom
private static Rect ExtendSelectionBottom(Rect rect, double extendBy)
{
Rect newRect = rect;
newRect.Height += extendBy;
return newRect;
}
/// <summary>
/// Capture Mouse
/// </summary>
private void InitializeCapture()
{
Debug.Assert(EditingCoordinator.UserIsEditing == false, "Unexpect UserIsEditng state." );
EditingCoordinator.UserIsEditing = true;
InkCanvas.SelectionAdorner.CaptureMouse();
}
/// <summary>
/// Release Mouse capture
/// </summary>
/// <param name="releaseDevice"></param>
/// <param name="commit"></param>
private void ReleaseCapture(bool releaseDevice, bool commit)
{
if ( EditingCoordinator.UserIsEditing )
{
EditingCoordinator.UserIsEditing = false;
if ( releaseDevice )
{
InkCanvas.SelectionAdorner.ReleaseMouseCapture();
}
SelfDeactivate();
// End the rubber band. If the operation is committed, we set the selection to the tracking rectangle.
// Otherwise, reset the selection to the original bounds.
InkCanvas.InkCanvasSelection.EndFeedbackAdorner(commit ? _previousRect : _selectionRect);
}
}
#endregion Private Methods
//-------------------------------------------------------------------------------
//
// Private Fields
//
//-------------------------------------------------------------------------------
#region Private Fields
private const double MinimumHeightWidthSize = 16.0;
private Point _previousLocation;
private Rect _previousRect;
private Rect _selectionRect;
private InkCanvasSelectionHitResult _hitResult;
private bool _actionStarted = false;
#endregion Private Fields
}
}
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