コード例 #1
0
        /// <summary>
        /// Event raised while the user is dragging a connector.
        /// </summary>
        private void ConnectorItem_Dragging(object source, ConnectorItemDraggingEventArgs e)
        {
            e.Handled = true;

            Trace.Assert((ConnectorItem)e.OriginalSource == this.draggedOutConnectorItem);

            Point mousePoint = Mouse.GetPosition(this);
            //
            // Raise an event so that application code can compute intermediate connection points.
            //
            var connectionDraggingEventArgs =
                new ConnectionDraggingEventArgs(ConnectionDraggingEvent, this,
                                                this.draggedOutNodeDataContext, this.draggingConnectionDataContext,
                                                this.draggedOutConnectorDataContext);

            RaiseEvent(connectionDraggingEventArgs);

            //
            // Figure out if the connection has been dragged over a connector.
            //

            ConnectorItem connectorDraggedOver            = null;
            object        connectorDataContextDraggedOver = null;
            bool          dragOverSuccess = DetermineConnectorItemDraggedOver(mousePoint, out connectorDraggedOver, out connectorDataContextDraggedOver);

            if (connectorDraggedOver != null)
            {
                //
                // Raise an event so that application code can specify if the connector
                // that was dragged over is valid or not.
                //
                var queryFeedbackEventArgs =
                    new QueryConnectionFeedbackEventArgs(QueryConnectionFeedbackEvent, this, this.draggedOutNodeDataContext, this.draggingConnectionDataContext,
                                                         this.draggedOutConnectorDataContext, connectorDataContextDraggedOver);

                RaiseEvent(queryFeedbackEventArgs);

                if (queryFeedbackEventArgs.FeedbackIndicator != null)
                {
                    //
                    // A feedback indicator was specified by the event handler.
                    // This is used to indicate whether the connection is good or bad!
                    //
                    AddFeedbackAdorner(connectorDraggedOver, queryFeedbackEventArgs.FeedbackIndicator);
                }
                else
                {
                    //
                    // No feedback indicator specified by the event handler.
                    // Clear any existing feedback indicator.
                    //
                    ClearFeedbackAdorner();
                }
            }
            else
            {
                //
                // Didn't drag over any valid connector.
                // Clear any existing feedback indicator.
                //
                ClearFeedbackAdorner();
            }
        }
コード例 #2
0
        /// <summary>
        /// Event raised while the user is dragging a connector.
        /// </summary>
        private void ConnectorItem_Dragging(object source, ConnectorItemDraggingEventArgs e)
        {
            e.Handled = true;

            Trace.Assert((ConnectorItem)e.OriginalSource == this.draggedOutConnectorItem);

            Point mousePoint = Mouse.GetPosition(this);
            //
            // Raise an event so that application code can compute intermediate connection points.
            //
            var connectionDraggingEventArgs =
                new ConnectionDraggingEventArgs(ConnectionDraggingEvent, this,
                        this.draggedOutNodeDataContext, this.draggingConnectionDataContext,
                        this.draggedOutConnectorDataContext);

            RaiseEvent(connectionDraggingEventArgs);

            //
            // Figure out if the connection has been dragged over a connector.
            //

            ConnectorItem connectorDraggedOver = null;
            object connectorDataContextDraggedOver = null;
            bool dragOverSuccess = DetermineConnectorItemDraggedOver(mousePoint, out connectorDraggedOver, out connectorDataContextDraggedOver);
            if (connectorDraggedOver != null)
            {
                //
                // Raise an event so that application code can specify if the connector
                // that was dragged over is valid or not.
                //
                var queryFeedbackEventArgs =
                    new QueryConnectionFeedbackEventArgs(QueryConnectionFeedbackEvent, this, this.draggedOutNodeDataContext, this.draggingConnectionDataContext,
                            this.draggedOutConnectorDataContext, connectorDataContextDraggedOver);

                RaiseEvent(queryFeedbackEventArgs);

                if (queryFeedbackEventArgs.FeedbackIndicator != null)
                {
                    //
                    // A feedback indicator was specified by the event handler.
                    // This is used to indicate whether the connection is good or bad!
                    //
                    AddFeedbackAdorner(connectorDraggedOver, queryFeedbackEventArgs.FeedbackIndicator);
                }
                else
                {
                    //
                    // No feedback indicator specified by the event handler.
                    // Clear any existing feedback indicator.
                    //
                    ClearFeedbackAdorner();
                }
            }
            else
            {
                //
                // Didn't drag over any valid connector.
                // Clear any existing feedback indicator.
                //
                ClearFeedbackAdorner();
            }
        }