/// <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));
}
/// <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);
}
}