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using System;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;
using System.Windows;
namespace DragResizeRotateItems
{
public class ResizeThumb : Thumb
{
private Point transformOrigin;
private double angle;
private Control parentItem;
private Control ParentItem
{
get
{
if (parentItem == null)
{
parentItem = this.DataContext as Control;
}
return parentItem;
}
}
public ResizeThumb()
{
base.DragStarted += new DragStartedEventHandler(ResizeThumb_DragStarted);
base.DragDelta += new DragDeltaEventHandler(ResizeThumb_DragDelta);
}
void ResizeThumb_DragStarted(object sender, DragStartedEventArgs e)
{
if (ParentItem != null)
{
transformOrigin = ParentItem.RenderTransformOrigin;
RotateTransform rotateTransform = ParentItem.RenderTransform as RotateTransform;
if (rotateTransform != null)
angle = rotateTransform.Angle * Math.PI / 180.0; //convert degrees to radians
else
angle = 0.0d;
}
}
void ResizeThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
if (ParentItem != null)
{
double deltaVertical, deltaHorizontal;
switch (base.VerticalAlignment)
{
case System.Windows.VerticalAlignment.Bottom:
deltaVertical = Math.Min(-e.VerticalChange, ParentItem.ActualHeight - ParentItem.MinHeight);
Canvas.SetTop(ParentItem, Canvas.GetTop(ParentItem) + (transformOrigin.Y * deltaVertical * (1 - Math.Cos(-angle))));
Canvas.SetLeft(ParentItem, Canvas.GetLeft(ParentItem) - deltaVertical * transformOrigin.Y * Math.Sin(-angle));
ParentItem.Height -= deltaVertical;
break;
case System.Windows.VerticalAlignment.Top:
deltaVertical = Math.Min(e.VerticalChange, ParentItem.ActualHeight - ParentItem.MinHeight);
Canvas.SetTop(ParentItem, Canvas.GetTop(ParentItem) + deltaVertical * Math.Cos(-angle) + (transformOrigin.Y * deltaVertical * (1 - Math.Cos(-angle))));
Canvas.SetLeft(ParentItem, Canvas.GetLeft(ParentItem) + deltaVertical * Math.Sin(-angle) - (transformOrigin.Y * deltaVertical * Math.Sin(-angle)));
ParentItem.Height -= deltaVertical;
break;
default:
break;
}
switch (base.HorizontalAlignment)
{
case System.Windows.HorizontalAlignment.Left:
deltaHorizontal = Math.Min(e.HorizontalChange, ParentItem.ActualWidth - ParentItem.MinWidth);
Canvas.SetTop(ParentItem, Canvas.GetTop(ParentItem) + deltaHorizontal * Math.Sin(angle) - transformOrigin.X * deltaHorizontal * Math.Sin(angle));
Canvas.SetLeft(ParentItem, Canvas.GetLeft(ParentItem) + deltaHorizontal * Math.Cos(angle) + (transformOrigin.X * deltaHorizontal * (1 - Math.Cos(angle))));
ParentItem.Width -= deltaHorizontal;
break;
case System.Windows.HorizontalAlignment.Right:
deltaHorizontal = Math.Min(-e.HorizontalChange, ParentItem.ActualWidth - ParentItem.MinWidth);
Canvas.SetTop(ParentItem, Canvas.GetTop(ParentItem) - transformOrigin.X * deltaHorizontal * Math.Sin(angle));
Canvas.SetLeft(ParentItem, Canvas.GetLeft(ParentItem) + (deltaHorizontal * transformOrigin.X * (1 - Math.Cos(angle))));
ParentItem.Width -= deltaHorizontal;
break;
default:
break;
}
}
e.Handled = true;
}
}
}
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