It seems that tab control performs layouting when Tab Page changes. Since
you have moved the control through API, maybe its internal coordinates are
NOT changed that is why Tab control again places it on its original
location. Try changing its Left and Top properties when dragging and
dropping finish.
On Tue, Oct 7, 2008 at 11:53 AM, 沈斌 <[EMAIL PROTECTED]> wrote:
> 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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