protected virtual void OnRelationAdded(BlockRelation relation)
{
var handler = this.RelationAdded;
if (handler != null)
{
handler(this, new RelationAddedEventArgs(relation));
}
}
private void AddConnectionIntoCanvas(BlockRelation relation)
{
var con = relation.CreateConnection();
ModelingDesigner.SetComponent(con, relation);
//从 0 开始添加，可以保证连接显示在元素之后。
_canvas.Children.Insert(0, con);
}
private void _canvas_DragLineCompleted(object sender, CanvasDragLineCompletedEventArgs e)
{
var source = BlockControl.GetBlockControl(e.Source);
var sink = BlockControl.GetBlockControl(e.Sink);
var relation = new BlockRelation
{
FromBlock = source.TypeFullName,
ToBlock = sink.TypeFullName
};
this.Relations.Insert(0, relation);
this.OnRelationAdded(relation);
}
public RelationAddedEventArgs(BlockRelation relation)
{
this.Relation = relation;
}
private void RemoveConnectionFromCanvas(BlockRelation con)
{
_canvas.Children.Remove(con.EngineControl);
}