private void MoveChild(NodeViewChild child, int x, int y)
{
int xMax, yMax;
Rectangle allocationView = Allocation;
Rectangle allocationChild = child.Child.Allocation;
x += child.Rectangle.X;
y += child.Rectangle.Y;
xMax = allocationView.Width - allocationChild.Width;
yMax = allocationView.Height - allocationChild.Height;
// Keep child within node view allocation
if (x > 0 && x < xMax)
{
child.Rectangle.X = x;
}
else if (x < 0)
{
child.Rectangle.X = 0;
}
else if (x > xMax)
{
child.Rectangle.X = xMax;
}
if (y > 0 && y < yMax)
{
child.Rectangle.Y = y;
}
else if (y < 0)
{
child.Rectangle.Y = 0;
}
else if (y > yMax)
{
child.Rectangle.Y = yMax;
}
child.X = child.Rectangle.X;
child.Y = child.Rectangle.Y;
if (child.Child.Visible)
{
child.Child.QueueResize();
}
// "raise" window, drawing occurs from start -> end of list
_children.Remove(child);
_children.Add(child);
QueueDraw();
}
private void ChildButtonReleaseEvent(object sender, ButtonReleaseEventArgs args)
{
NodeViewChild child = GetChild((Widget)sender);
Debug.Assert(child != null);
if (args.Event.Button == 1) // GDK_BUTTON_PRIMARY
{
((Node)child.Child).UnblockExpander();
}
_action = NodeViewAction.None;
args.RetVal = false;
}
private void ChildButtonPressEventHandler(object sender, ButtonPressEventArgs args)
{
NodeViewChild child = GetChild((Widget)sender);
Debug.Assert(child != null);
if (args.Event.Button == 1) // GDK_BUTTON_PRIMARY
{
int x = (int)args.Event.X;
int y = (int)args.Event.Y;
bool inside = PointInRectangle(child.SouthEast, x, y);
_action = inside ? NodeViewAction.Resize : NodeViewAction.DragChild;
child.DragStart = new Point(x, y);
Rectangle childAlloc = child.Child.Allocation;
child.DragDelta = new Point(x - (childAlloc.X + childAlloc.Width), y - (childAlloc.Y + childAlloc.Height));
}
args.RetVal = false;
}
private void ChildMotionNotifyEventHandler(object sender, MotionNotifyEventArgs args)
{
NodeViewChild child = GetChild((Widget)sender);
Debug.Assert(child != null);
if (_action == NodeViewAction.None)
{
bool inside = PointInRectangle(child.SouthEast, (int)args.Event.X, (int)args.Event.Y);
NodeCursorSet(inside ? NodeViewAction.Resize : NodeViewAction.None);
}
if ((args.Event.State & ModifierType.Button1Mask) != 0)
{
if (_action == NodeViewAction.DragChild)
{
((Node)child.Child).BlockExpander();
MoveChild(child, (int)args.Event.X - child.DragStart.X, (int)args.Event.Y - child.DragStart.Y);
}
if (_action == NodeViewAction.Resize)
{
int w = (int)args.Event.X - child.Rectangle.X - child.DragDelta.X;
int h = (int)args.Event.Y - child.Rectangle.Y - child.DragDelta.Y;
child.Rectangle.Width = Math.Max(0, w);
child.Rectangle.Height = Math.Max(0, h);
child.Width = child.Rectangle.Width;
child.Height = child.Rectangle.Height;
child.Child.QueueResize();
QueueDraw();
}
}
args.RetVal = true;
}