ResizeThumb.cs
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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;
namespace RoboforkApp
{
public class ResizeThumb : Thumb
{
private DesignerItem designerItem;
private DesignerCanvas designerCanvas;
public ResizeThumb()
{
DragStarted += new DragStartedEventHandler(this.ResizeThumb_DragStarted);
DragDelta += new DragDeltaEventHandler(this.ResizeThumb_DragDelta);
}
private void ResizeThumb_DragStarted(object sender, DragStartedEventArgs e)
{
this.designerItem = DataContext as DesignerItem;
if (this.designerItem != null)
{
this.designerCanvas = VisualTreeHelper.GetParent(this.designerItem) as DesignerCanvas;
}
}
private void ResizeThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
if (this.designerItem != null && this.designerCanvas != null && this.designerItem.IsSelected)
{
double minLeft = double.MaxValue;
double minTop = double.MaxValue;
double minDeltaHorizontal = double.MaxValue;
double minDeltaVertical = double.MaxValue;
double dragDeltaVertical, dragDeltaHorizontal;
foreach (DesignerItem item in this.designerCanvas.SelectedItems)
{
minLeft = Math.Min(Canvas.GetLeft(item), minLeft);
minTop = Math.Min(Canvas.GetTop(item), minTop);
minDeltaVertical = Math.Min(minDeltaVertical, item.ActualHeight - item.MinHeight);
minDeltaHorizontal = Math.Min(minDeltaHorizontal, item.ActualWidth - item.MinWidth);
}
foreach (DesignerItem item in this.designerCanvas.SelectedItems)
{
switch (VerticalAlignment)
{
case VerticalAlignment.Bottom:
dragDeltaVertical = Math.Min(-e.VerticalChange, minDeltaVertical);
item.Height = item.ActualHeight - dragDeltaVertical;
break;
case VerticalAlignment.Top:
dragDeltaVertical = Math.Min(Math.Max(-minTop, e.VerticalChange), minDeltaVertical);
Canvas.SetTop(item, Canvas.GetTop(item) + dragDeltaVertical);
item.Height = item.ActualHeight - dragDeltaVertical;
break;
}
switch (HorizontalAlignment)
{
case HorizontalAlignment.Left:
dragDeltaHorizontal = Math.Min(Math.Max(-minLeft, e.HorizontalChange), minDeltaHorizontal);
Canvas.SetLeft(item, Canvas.GetLeft(item) + dragDeltaHorizontal);
item.Width = item.ActualWidth - dragDeltaHorizontal;
break;
case HorizontalAlignment.Right:
dragDeltaHorizontal = Math.Min(-e.HorizontalChange, minDeltaHorizontal);
item.Width = item.ActualWidth - dragDeltaHorizontal;
break;
}
}
e.Handled = true;
}
}
}
}