示例#1
0
 /// <summary>
 /// Unselect any selected objects.
 /// </summary>
 public void UnSelect()
 {
     nodes.ForEach(node => { node.Selected = false; });
     arcs.ForEach(arc => { arc.Selected = false; });
     SelectedObject  = null;
     SelectedObject2 = null;
     mouseDown       = false;
     isDragging      = false;
     // Redraw area.
     drawable.QueueDraw();
     OnGraphObjectSelected?.Invoke(this, new GraphObjectSelectedArgs(null));
 }
示例#2
0
        /// <summary>Mouse button has been pressed</summary>
        private void OnMouseButtonPress(object o, ButtonPressEventArgs args)
        {
            try
            {
                // Get the point clicked by the mouse.
                PointD clickPoint = new PointD(args.Event.X, args.Event.Y);

                if (args.Event.Button == 1)
                {
                    mouseDown = true;

                    // Delselect existing object
                    if (SelectedObject != null)
                    {
                        SelectedObject.Selected = false;
                    }

                    // Look through nodes for the click point
                    SelectedObject = nodes.FindLast(node => node.HitTest(clickPoint));

                    // If not found, look through arcs for the click point
                    if (SelectedObject == null)
                    {
                        SelectedObject = arcs.FindLast(arc => arc.HitTest(clickPoint));
                    }

                    // If found object, select it.
                    if (SelectedObject != null)
                    {
                        SelectedObject.Selected = true;
                        lastPos = clickPoint;
                        OnGraphObjectSelected?.Invoke(this, new GraphObjectSelectedArgs(SelectedObject));
                    }

                    // Redraw area.
                    (o as DrawingArea).QueueDraw();
                }
                else
                {
                    if (SelectedObject2 != null)
                    {
                        SelectedObject2.Selected = false;
                    }

                    SelectedObject2 = nodes.FindLast(node => node.HitTest(clickPoint));
                    if (SelectedObject2 == null)
                    {
                        SelectedObject2 = arcs.FindLast(arc => arc.HitTest(clickPoint));
                    }

                    // If the user has right-clicked in the middle of nowhere, unselect everything.
                    if (SelectedObject2 == null)
                    {
                        UnSelect();
                    }
                    else if (SelectedObject2 == SelectedObject)
                    {
                        SelectedObject2 = null;
                    }
                }
            }
            catch (Exception err)
            {
                ShowError(err);
            }
        }