protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
DesignerCanvas canvas = GetDesignerCanvas(this);
if (canvas != null)
{
// position relative to DesignerCanvas
this.dragStartPoint = new Point?(e.GetPosition(canvas));
e.Handled = true;
}
}
private void ShowAdorner()
{
// the ConnectionAdorner is created once for each Connection
if (this.connectionAdorner == null)
{
DesignerCanvas designer = VisualTreeHelper.GetParent(this) as DesignerCanvas;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(designer);
if (adornerLayer != null)
{
this.connectionAdorner = new ConnectionAdorner(designer, this);
adornerLayer.Add(this.connectionAdorner);
}
}
this.connectionAdorner.Visibility = Visibility.Visible;
}
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
DragObject dragObject = e.Data.GetData(typeof(DragObject)) as DragObject;
if (dragObject != null && !String.IsNullOrEmpty(dragObject.Xaml))
{
DesignerItem newItem = null;
Object content = XamlReader.Load(XmlReader.Create(new StringReader(dragObject.Xaml)));
if (content != null)
{
newItem = new DesignerItem();
newItem.Content = content;
Point position = e.GetPosition(this);
if (dragObject.DesiredSize.HasValue)
{
Size desiredSize = dragObject.DesiredSize.Value;
newItem.Width = desiredSize.Width;
newItem.Height = desiredSize.Height;
DesignerCanvas.SetLeft(newItem, Math.Max(0, position.X - newItem.Width / 2));
DesignerCanvas.SetTop(newItem, Math.Max(0, position.Y - newItem.Height / 2));
}
else
{
DesignerCanvas.SetLeft(newItem, Math.Max(0, position.X));
DesignerCanvas.SetTop(newItem, Math.Max(0, position.Y));
}
this.Children.Add(newItem);
//update selection
foreach (ISelectable item in this.SelectedItems)
{
item.IsSelected = false;
}
SelectedItems.Clear();
newItem.IsSelected = true;
this.SelectedItems.Add(newItem);
}
e.Handled = true;
}
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
if (this.ScrollViewer == null)
{
return;
}
this.designerCanvas = this.ScrollViewer.Content as DesignerCanvas;
if (this.designerCanvas == null)
{
throw new Exception("DesignerCanvas must not be null!");
}
this.zoomThumb = Template.FindName("PART_ZoomThumb", this) as Thumb;
if (this.zoomThumb == null)
{
throw new Exception("PART_ZoomThumb template is missing!");
}
this.zoomCanvas = Template.FindName("PART_ZoomCanvas", this) as Canvas;
if (this.zoomCanvas == null)
{
throw new Exception("PART_ZoomCanvas template is missing!");
}
this.zoomSlider = Template.FindName("PART_ZoomSlider", this) as Slider;
if (this.zoomSlider == null)
{
throw new Exception("PART_ZoomSlider template is missing!");
}
this.designerCanvas.LayoutUpdated += new EventHandler(this.DesignerCanvas_LayoutUpdated);
this.zoomThumb.DragDelta += new DragDeltaEventHandler(this.Thumb_DragDelta);
this.zoomSlider.ValueChanged += new RoutedPropertyChangedEventHandler <double>(this.ZoomSlider_ValueChanged);
this.scaleTransform = new ScaleTransform();
this.designerCanvas.LayoutTransform = this.scaleTransform;
}
void Connection_Unloaded(object sender, RoutedEventArgs e)
{
// do some housekeeping when Connection is unloaded
// remove event handler
source.PropertyChanged -= new PropertyChangedEventHandler(OnConnectorPositionChanged);
sink.PropertyChanged -= new PropertyChangedEventHandler(OnConnectorPositionChanged);
// remove adorner
if (this.connectionAdorner != null)
{
DesignerCanvas designer = VisualTreeHelper.GetParent(this) as DesignerCanvas;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(designer);
if (adornerLayer != null)
{
adornerLayer.Remove(this.connectionAdorner);
this.connectionAdorner = null;
}
}
}
protected override void OnMouseDown(System.Windows.Input.MouseButtonEventArgs e)
{
base.OnMouseDown(e);
// usual selection business
DesignerCanvas designer = VisualTreeHelper.GetParent(this) as DesignerCanvas;
if (designer != null)
{
if ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) != ModifierKeys.None)
{
if (this.IsSelected)
{
this.IsSelected = false;
designer.SelectedItems.Remove(this);
}
else
{
this.IsSelected = true;
designer.SelectedItems.Add(this);
}
}
else if (!this.IsSelected)
{
foreach (ISelectable item in designer.SelectedItems)
{
item.IsSelected = false;
}
designer.SelectedItems.Clear();
this.IsSelected = true;
designer.SelectedItems.Add(this);
}
Focus();
}
e.Handled = true;
}
