protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
string xamlString = e.Data.GetData("DESIGNER_ITEM") as string;
if (!String.IsNullOrEmpty(xamlString))
{
DesignerItem newItem = null;
if (XamlReader.Load(XmlReader.Create(new StringReader(xamlString))) is FrameworkElement content)
{
newItem = new DesignerItem
{
Content = content,
DesignerCanvas = this
};
var pos = e.GetPosition(this);
if (content.MinHeight != 0 && content.MinWidth != 0)
{
newItem.Width = content.MinWidth * 2;
newItem.Height = content.MinHeight * 2;
}
else
{
newItem.Width = DefaultValues.ItemDefaultWidth;
newItem.Height = DefaultValues.ItemDefaultHeight;
}
DesignerCanvas.SetLeft(newItem, Math.Max(0, pos.X - newItem.Width / 2));
DesignerCanvas.SetTop(newItem, Math.Max(0, pos.Y - newItem.Height / 2));
Children.Add(newItem);
newItem.Position = new Point(DesignerCanvas.GetLeft(newItem), DesignerCanvas.GetTop(newItem));
DeselectAll();
newItem.IsSelected = true;
}
e.Handled = true;
}
}
protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseDown(e);
if (DesignerCanvas != null)
{
if ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) != ModifierKeys.None)
{
IsSelected = !IsSelected;
}
else
{
if (!IsSelected)
{
DesignerCanvas.DeselectAll();
IsSelected = true;
}
}
}
e.Handled = false;
}
public RubberbandAdorner(DesignerCanvas designerCanvas, Point?dragStartPoint) : base(designerCanvas)
{
this.designerCanvas = designerCanvas;
startPoint = dragStartPoint;
adornerCanvas = new Canvas
{
Background = Brushes.Transparent
};
visuals = new VisualCollection(this)
{
adornerCanvas
};
rubberband = new Rectangle
{
Stroke = Brushes.Navy,
StrokeThickness = 1,
StrokeDashArray = new DoubleCollection(new double[] { 2 })
};
adornerCanvas.Children.Add(rubberband);
}
private static void DpChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DesignerCanvas dc = (DesignerCanvas)d;
dc.DesignerControl.RefreshPlaneStates();
}
