/// <summary>
/// 从可视树上获取某个元素的外层 DesignerItemContainer。
/// </summary>
/// <param name="element"></param>
/// <returns></returns>
public static DesignerItemContainer GetItemContainer(DependencyObject element)
{
DesignerItemContainer designerItem = null;
DependencyObject parent = element;
while (true)
{
parent = VisualTreeHelper.GetParent(parent);
if (parent == null)
{
break;
}
designerItem = parent as DesignerItemContainer;
if (designerItem != null)
{
break;
}
//如果已经找到 DesignerCanvas，则退出。
if (parent is DesignerCanvas)
{
break;
}
}
return(designerItem);
}
private static ConnectorInfo GetConnectorInfo(DesignerItemContainer item, Point relative)
{
var info = new ConnectorInfo();
info.DesignerItemRect = item.GetRect();
info.Position = RectAlgorithm.GetRectAbsolute(info.DesignerItemRect, relative);
return(info);
}
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;
}
}
}
internal protected virtual void OnDragLineCompleted(DesignerItemContainer source, DesignerItemContainer sink)
{
//默认实现如下：
////从 0 开始添加，可以保证连接显示在元素之后。
//this.Children.Insert(0, new Connection
//{
// Source = source,
// Sink = sink
//});
var handler = this.DragLineCompleted;
if (handler != null)
{
handler(this, new CanvasDragLineCompletedEventArgs(source, sink));
}
}
void thumbDragThumb_DragStarted(object sender, DragStartedEventArgs e)
{
this.Cursor = Cursors.Cross;
this.HitDesignerItem = null;
this._pathGeometry = null;
if (sender == _sourceDragThumb)
{
_startItem = _connection.Sink;
_draggingItem = _connection.Source;
}
else if (sender == _sinkDragThumb)
{
_startItem = _connection.Source;
_draggingItem = _connection.Sink;
}
}
private void HitTesting(Point hitPoint)
{
var hitObject = _canvas.InputHitTest(hitPoint) as DependencyObject;
while (hitObject != null && hitObject != _connector.ParentDesignerItem)
{
if (hitObject is DesignerCanvas)
{
break;
}
if (hitObject is DesignerItemContainer)
{
HitDesignerItem = hitObject as DesignerItemContainer;
return;
}
hitObject = VisualTreeHelper.GetParent(hitObject);
}
HitDesignerItem = null;
}
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 CanvasDragLineCompletedEventArgs(DesignerItemContainer source, DesignerItemContainer sink)
{
this.Source = source;
this.Sink = sink;
}
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;
}
}
protected internal virtual void OnDragLineCompleted(DesignerItemContainer source, DesignerItemContainer sink)
{
//默认实现如下：
////从 0 开始添加，可以保证连接显示在元素之后。
//this.Children.Insert(0, new Connection
//{
// Source = source,
// Sink = sink
//});
var handler = this.DragLineCompleted;
if (handler != null) handler(this, new CanvasDragLineCompletedEventArgs(source, sink));
}
private void AddItemIntoCanvas(BlockControl block)
{
var container = new DesignerItemContainer();
container.Content = block;
block.Container = container;
SetComponent(container, block);
//应用样式
var containerStyle = this.BlockContainerStyle;
if (containerStyle != null) container.Style = containerStyle;
container.DataContext = block;
container.SetBinding(Canvas.LeftProperty, new Binding { Path = new PropertyPath(BlockControl.LeftProperty), Mode = BindingMode.TwoWay });
container.SetBinding(Canvas.TopProperty, new Binding { Path = new PropertyPath(BlockControl.TopProperty), Mode = BindingMode.TwoWay });
_canvas.Children.Add(container);
}
private static ConnectorInfo GetConnectorInfo(DesignerItemContainer item, Point relative)
{
var info = new ConnectorInfo();
info.DesignerItemRect = item.GetRect();
info.Position = RectAlgorithm.GetRectAbsolute(info.DesignerItemRect, relative);
return info;
}
public CanvasDragLineCompletedEventArgs(DesignerItemContainer source, DesignerItemContainer sink)
{
this.Source = source;
this.Sink = sink;
}
void thumbDragThumb_DragStarted(object sender, DragStartedEventArgs e)
{
this.Cursor = Cursors.Cross;
this.HitDesignerItem = null;
this._pathGeometry = null;
if (sender == _sourceDragThumb)
{
_startItem = _connection.Sink;
_draggingItem = _connection.Source;
}
else if (sender == _sinkDragThumb)
{
_startItem = _connection.Source;
_draggingItem = _connection.Sink;
}
}
void thumbDragThumb_DragCompleted(object sender, DragCompletedEventArgs e)
{
if (_changeTarget)
{
var hitted = this.HitDesignerItem;
if (hitted != null)
{
if (_connection.Sink == _draggingItem)
{
_connection.Sink = hitted;
}
else
{
_connection.Source = hitted;
}
this.HitDesignerItem = null;
}
_connection.StrokeDashArray = _rawStrokeDashArray;
_changeTarget = false;
}
this._pathGeometry = null;
this.InvalidateVisual();
}
private void HitTesting(Point hitPoint)
{
var hitObject = _designerCanvas.InputHitTest(hitPoint) as DependencyObject;
while (hitObject != null && hitObject != _startItem)
{
if (hitObject is DesignerCanvas) break;
if (hitObject is DesignerItemContainer)
{
HitDesignerItem = hitObject as DesignerItemContainer;
return;
}
hitObject = VisualTreeHelper.GetParent(hitObject);
}
HitDesignerItem = null;
}