private dragOption selectLocation(System.Drawing.Point mouseLocation)
{
dragOption ret = dragOption.none;
Location loc = GetLocation(mouseLocation);
if (loc != null)
{
if (Control.ModifierKeys != Keys.Shift && _dragging == dragOption.none)
{
_currentLocations.Clear();
}
if (_currentLocations.Contains(loc))
{
if (_dragging != dragOption.dragAdd)
{
_currentLocations.Remove(loc);
ret = dragOption.dragRemove;
}
}
else
{
if (_dragging != dragOption.dragRemove)
{
_currentLocations.Add(loc);
ret = dragOption.dragAdd;
}
}
}
return(ret);
}
private void skControl1_MouseUp(object sender, MouseEventArgs e)
{
_dragging = dragOption.none;
}
private void skControl1_MouseDown(object sender, MouseEventArgs e)
{
_dragging = selectLocation(e.Location);
skControl1.Invalidate();
}