protected virtual void OnDragStart(DragStartEventArgs e)
{
if (_closeButtonState != CloseButtonState.None)
{
_closeButtonState = CloseButtonState.None;
Invalidate(_currentCloseButtonBounds);
}
_currentCloseButtonBounds = Rectangle.Empty;
var handler = DragStart;
if (handler != null)
{
DragStart(this, e);
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (
_dragStartRect != Rectangle.Empty &&
!_dragStartRect.Contains(e.X, e.Y)
)
{
var tabPage = GetTabPage(_dragStartPoint);
if (tabPage != null)
{
var dse = new DragStartEventArgs();
OnDragStart(dse);
var dataObj = new DataObject();
if (dse.DragDataObjects != null)
{
foreach (var obj in dse.DragDataObjects)
{
dataObj.SetData(obj);
}
}
dataObj.SetData(tabPage);
DoDragDrop(dataObj, DragDropEffects.Move | dse.AllowedEffect);
}
}
else
{
if (_closeButtonState != CloseButtonState.Pressed)
{
var tabPage = GetTabPage(e.Location);
if (tabPage != null)
{
var r = GetCloseButtonBounds(tabPage);
var oldCloseButtonBounds = _currentCloseButtonBounds;
if (r.Contains(e.Location))
{
_closeButtonState = CloseButtonState.Hovered;
}
else
{
_closeButtonState = CloseButtonState.Normal;
}
if (r != oldCloseButtonBounds)
{
Invalidate(oldCloseButtonBounds);
Invalidate(r);
}
_currentCloseButtonBounds = r;
}
else
{
_currentCloseButtonBounds = Rectangle.Empty;
}
}
else
{
_currentCloseButtonBounds = Rectangle.Empty;
}
}
}
