public RubberbandAdorner(DesignerCanvas designerCanvas, Point? dragStartPoint)
: base(designerCanvas)
{
this._designerCanvas = designerCanvas;
this._startPoint = dragStartPoint;
_rubberbandPen = new Pen(Brushes.LightSlateGray, 1);
_rubberbandPen.DashStyle = new DashStyle(new double[] { 2 }, 1);
}
public ConnectorAdorner(DesignerCanvas designer, Connector connector)
: base(designer)
{
this._canvas = designer;
this._connector = connector;
_drawingPen = new Pen(Brushes.LightSlateGray, 1);
_drawingPen.LineJoin = PenLineJoin.Round;
this.Cursor = Cursors.Cross;
}
public ConnectionAdorner(DesignerCanvas designer, Connection connection)
: base(designer)
{
this._designerCanvas = designer;
this._myCanvas = new Canvas();
this._visualChildren = new VisualCollection(this);
this._visualChildren.Add(_myCanvas);
this._connection = connection;
InitializeDragThumbs();
}
public ConnectionAdorner(DesignerCanvas designer, Connection connection)
: base(designer)
{
this._designerCanvas = designer;
this._myCanvas = new Canvas();
this._visualChildren = new VisualCollection(this);
this._visualChildren.Add(_myCanvas);
this._connection = connection;
InitializeDragThumbs();
}
protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseDown(e);
//更新选择项。
var designer = DesignerCanvas.GetOwnerCanvas(this);
if (designer != null)
{
designer.HandleMouseSelection(this);
}
e.Handled = false;
}
private DesignerItemContainer[] GetSelectedContainers()
{
DesignerItemContainer[] selectedDesignerItems = null;
var designerItem = this.DataContext as DesignerItemContainer;
if (designerItem != null && designerItem.IsSelected)
{
var designer = DesignerCanvas.GetOwnerCanvas(designerItem);
if (designer != null)
{
// only resize DesignerItems
selectedDesignerItems = designer.SelectedItems.OfType <DesignerItemContainer>().ToArray();
}
}
return(selectedDesignerItems);
}
void DragThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
var designerItem = DesignerItemContainer.GetItemContainer(this);
if (designerItem != null && designerItem.IsSelected)
{
var designer = DesignerCanvas.GetOwnerCanvas(designerItem);
if (designer != null)
{
//只移动 DesignerItem
var designerItems = designer.SelectedItems.OfType <DesignerItemContainer>();
//以下代码不知何意，暂留。
//double minLeft = double.MaxValue;
//double minTop = double.MaxValue;
//foreach (var item in designerItems)
//{
// double left = GetDouble(item, Canvas.LeftProperty);
// double top = GetDouble(item, Canvas.TopProperty);
// minLeft = Math.Min(left, minLeft);
// minTop = Math.Min(top, minTop);
//}
//double deltaHorizontal = Math.Max(-minLeft, e.HorizontalChange);
//double deltaVertical = Math.Max(-minTop, e.VerticalChange);
double deltaHorizontal = e.HorizontalChange;
double deltaVertical = e.VerticalChange;
foreach (var item in designerItems)
{
double left = GetDouble(item, Canvas.LeftProperty);
double top = GetDouble(item, Canvas.TopProperty);
Canvas.SetLeft(item, left + deltaHorizontal);
Canvas.SetTop(item, top + deltaVertical);
}
designer.InvalidateMeasure();
e.Handled = true;
}
}
}
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
var dragObject = e.Data.GetData(typeof(DragObject)) as DragObject;
if (dragObject != null && !String.IsNullOrEmpty(dragObject.Xaml))
{
var content = XamlReader.Load(XmlReader.Create(new StringReader(dragObject.Xaml)));
if (content != null)
{
var newItem = new DesignerItemContainer();
newItem.Content = content;
var 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);
this.AddSelection(true, newItem);
}
e.Handled = true;
}
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_canvas = this.Template.FindName("PART_DesignerCanvas", this) as DesignerCanvas;
if (_canvas == null) throw new InvalidProgramException("ModelingDesigner 的模板中必须要有命名为 PART_DesignerCanvas 的 DesignerCanvas 元素。");
_canvas.SelectionChanged += (o, e) => this.OnSelectionChanged();
_canvas.DragLineCompleted += _canvas_DragLineCompleted;
//在首次加载时，把所有元素加入到画布中。
AddElementsIntoCanvas();
}