public DiagramCanvas()
{
this.UseLayoutRounding = true;
this.SnapsToDevicePixels = true;
this.Background = Brushes.White;
this.visualState = Visuals.VisualState.Idle;
this.visualHits = new List <DependencyObject>();
this.VisualList = new List <VisualGraphics>();
this.graphicsPolylines = new Dictionary <string, List <GraphicsPolyline> >();
}
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
Point cursorPosition = e.GetPosition(this);
switch (this.visualState)
{
case Visuals.VisualState.Translate:
{
this.visualState = Visuals.VisualState.Idle;
this.translateVisual = null;
this.associatedPolylines = null;
break;
}
case Visuals.VisualState.Idle:
{
break;
}
case Visuals.VisualState.Connecting:
{
this.visualState = Visuals.VisualState.Idle;
this.firstVisual = null;
this.secondVisual = null;
break;
}
case Visuals.VisualState.Resizing:
{
this.visualState = Visuals.VisualState.Idle;
break;
}
case Visuals.VisualState.InputState:
{
break;
}
default:
throw new NotImplementedException();
}
}
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
this.previouseSelectedVisual = this.selectedVisual;
Point cursorPosition = e.GetPosition(this);
VisualGraphics visualHit = this.HitTestFirstVisual <ExcludedNullVisual>(cursorPosition);
if (visualHit == null)
{
if (this.selectedVisual != null)
{
this.selectedVisual.IsSelected = false;
this.selectedVisual.IsDrawHandle = false;
this.selectedVisual.Render();
this.selectedVisual = null;
}
// 停止编辑状态
this.StopVisualInputState(this.previouseSelectedVisual);
TextBoxEditor.Visibility = Visibility.Collapsed;
// 重置到空闲状态
this.visualState = Visuals.VisualState.Idle;
return;
}
this.ProcessSelectedVisualChanged(this.selectedVisual, visualHit);
this.selectedVisual = visualHit;
this.previousPosition = cursorPosition;
if (e.ClickCount == 2)
{
// 双击图形，那么进入编辑状态
this.visualState = Visuals.VisualState.InputState;
this.StartVisualInputState(this.selectedVisual);
}
else
{
this.StopVisualInputState(this.previouseSelectedVisual);
#region 判断是否点击了连接点
for (int i = 0; i < visualHit.ConnectionHandles; i++)
{
Rect bounds = visualHit.GetConnectorBounds(i);
if (bounds.Contains(cursorPosition))
{
Point center = bounds.GetCenter();
ConnectionLocations location = visualHit.GetConnectorLocation(i);
this.visualState = Visuals.VisualState.Connecting;
GraphicsPolyline graphics = new GraphicsPolyline()
{
AssociatedGraphics1 = visualHit.ID,
Graphics1Handle = i
};
this.polyline = this.DrawVisual(graphics) as VisualPolyline;
this.firstConnector = center;
this.firstConnectorLocation = location;
this.firstVisual = visualHit;
return;
}
}
#endregion
#region 判断是否点击了Reisze点
for (int i = 0; i < visualHit.ResizeHandles; i++)
{
Rect bounds = visualHit.GetResizeHandleBounds(i);
if (bounds.Contains(cursorPosition))
{
this.resizeCenter = bounds.GetCenter();
this.resizeLocation = visualHit.Graphics.GetResizeLocation(this.resizeCenter);
this.visualState = Visuals.VisualState.Resizing;
return;
}
}
#endregion
#region 是平移状态
// 获取当前被移动的图形所有的连接点信息
this.associatedPolylines = this.GetAssociatedPolylines(visualHit.Graphics);
Console.WriteLine("关联的折线有{0}个", this.associatedPolylines.Count);
this.translateVisual = visualHit;
this.visualState = Visuals.VisualState.Translate;
#endregion
}
}