private void Control_DragDrop(object sender, DragEventArgs e)
{
try
{
if (e.Data.GetDataPresent(typeof(DragDropItem <TControl, T>)))
{
DragDropItem <TControl, T> d = (DragDropItem <TControl, T>)e.Data.GetData(typeof(DragDropItem <TControl, T>));
TControl pointedParent = (TControl)sender;
MoveItemInternal(pointedParent, d, e, true);
}
}
catch (Exception ex)
{
LOG.Error("Control_DragDrop - An error occurred while drag dropping", ex);
}
}
private void Control_DragOver(object sender, DragEventArgs e)
{
try
{
if (e.Data.GetDataPresent(typeof(DragDropItem <TControl, T>)))
{
DragDropItem <TControl, T> d = (DragDropItem <TControl, T>)e.Data.GetData(typeof(DragDropItem <TControl, T>));
TControl pointedParent = (TControl)sender;
OnDragMove(new DragMoveEventArgs <TControl, T>(d.DragParent, d.DragItem, d.DragItemIndex, d.DragStart, new Point(e.X, e.Y)));
MoveItemInternal(pointedParent, d, e, false);
}
}
catch (Exception ex)
{
LOG.Error("Control_DragOver - An error occurred while dragging over", ex);
}
}
private bool MoveItemInternal(TControl pointedParent, DragDropItem <TControl, T> d, DragEventArgs e, bool dropping)
{
try
{
Point p = new Point(e.X, e.Y);
T pointedItem;
int pointedItemIndex;
if (GetItemFromPoint(pointedParent, pointedParent.PointToClient(p), out pointedItem, out pointedItemIndex) &&
e.AllowedEffect == DragDropEffects.Move)
{
OnDragMoveOver(new DragMoveOverEventArgs <TControl, T>(d.DragParent, d.DragItem, d.DragItemIndex, d.DragStart, p, pointedParent, pointedItem, pointedItemIndex));
if (AllowDrop(d.DragParent, d.DragItem, d.DragItemIndex, pointedParent, pointedItem, pointedItemIndex))
{
e.Effect = DragDropEffects.Move;
if (dropping ||
!MoveOnDragDrop)
{
MoveItem(d.DragParent, d.DragItem, d.DragItemIndex, pointedParent, pointedItem, pointedItemIndex);
d.UpdateSwapped(pointedParent, pointedItemIndex);
return(true);
}
else
{
return(false);
}
}
}
}
catch (Exception ex)
{
LOG.Error("MoveItemInternal - An error occurred while moving item", ex);
}
e.Effect = DragDropEffects.None;
return(false);
}
private void Control_MouseMove(object sender, MouseEventArgs e)
{
try
{
if (_mouseDown)
{
TControl parent = (TControl)sender;
Point p = parent.PointToScreen(e.Location);
if (Math.Sqrt(Math.Pow(p.X - _mouseDownLocation.X, 2) + Math.Pow(p.Y - _mouseDownLocation.Y, 2)) >= DRAG_THRESHOLD)
{
T item;
int itemIndex;
if (GetItemFromPoint(parent, e.Location, out item, out itemIndex) &&
ItemsEqual(_mouseDownParent, _mouseDownItem, _mouseDownItemIndex, parent, item, itemIndex))
{
_mouseDown = false;
OnDragStart(new DragStartEventArgs <TControl, T>(parent, item, itemIndex, _mouseDownLocation));
DragDropItem <TControl, T> dragDropItem = new DragDropItem <TControl, T>(parent, item, itemIndex, _mouseDownLocation);
DragDropEffects effects = parent.DoDragDrop(dragDropItem, DragDropEffects.Move);
OnDragEnd(new DragEndEventArgs <TControl, T>(parent, item, itemIndex, _mouseDownLocation, Control.MousePosition, effects));
ClearDragDrop();
}
else
{
ClearDragDrop();
}
}
}
}
catch (Exception ex)
{
LOG.Error("Control_MouseMove - An error occurred while mousing moving", ex);
}
}
private void Control_MouseMove(object?sender, MouseEventArgs e)
{
try
{
if (_mouseDown)
{
TControl?parent = sender as TControl;
if (parent == null)
{
return;
}
Point p = parent.PointToScreen(e.Location);
if (Math.Sqrt(Math.Pow(p.X - _mouseDownLocation.X, 2) + Math.Pow(p.Y - _mouseDownLocation.Y, 2)) >= DRAG_THRESHOLD)
{
T item;
if (GetItemFromPoint(parent, e.Location, out item !, out int itemIndex) &&
ItemsEqual(_mouseDownParent !, _mouseDownItem !, _mouseDownItemIndex, parent, item, itemIndex))
{
_mouseDown = false;
OnDragStart(new DragStartEventArgs <TControl, T>(parent, item, itemIndex, _mouseDownLocation));
DragDropItem <TControl, T> dragDropItem = new DragDropItem <TControl, T>(parent, item, itemIndex, _mouseDownLocation);
DragDropEffects effects = parent.DoDragDrop(dragDropItem, DragDropEffects.Move);
OnDragEnd(new DragEndEventArgs <TControl, T>(parent, item, itemIndex, _mouseDownLocation, Control.MousePosition, effects));
ClearDragDrop();
}
else
{
ClearDragDrop();
}
}
}
}
