When I am trying to move a control at runtime in a tabPage by using
WM_NCHITTEST, though the control is seen dragged to a new location,
but when then tabPage is goes down and up again. the location of the
previously dragged control goes back to its original location.
So what's wrong?
The control code:
class DraggablePicBox : PictureBox
{
private const int WM_NCHITTEST = 0x84;
private const int HTCLIENT = 0x1;
private const int HTCAPTION = 0x2;
public bool DraggAble
{
get;
set;
}
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (this.DraggAble && m.Msg == WM_NCHITTEST)
{
if ((int)m.Result == HTCLIENT)
m.Result = (IntPtr)HTCAPTION;
}
}
}
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