Moving objects

[AM Hulshoff]

Can someone tell me how I can move an object, in this case a listbox, over a
form. The code below works, but not when the form is custom sized. It works
perfectly when the form is maximized. And what is the best way to give the
object boundries to move within?

Hope someone can help me.
TIA,
Arjan.

/*Begin Code*/
/*Source: MSDN*/
void ListBox1MouseDo wn(object sender, System.Windows. Forms.MouseEven tArgs e)
{
int xOffset;
int yOffset;

if(e.Button == MouseButtons.Le ft)
{
xOffset = -e.X - SystemInformati on.FrameBorderS ize.Width;
yOffset = -e.Y - SystemInformati on.CaptionHeigh t -
SystemInformati on.FrameBorderS ize.Height;
mouseOffset = new Point(xOffset, yOffset);
isMouseDown = true;
}
}

void ListBox1MouseMo ve(object sender, System.Windows. Forms.MouseEven tArgs e)
{
if (isMouseDown)
{
Point mousePos = Control.MousePo sition;
mousePos.Offset (mouseOffset.X, mouseOffset.Y);
listBox1.Locati on = mousePos;
}
}

void ListBox1MouseUp (object sender, System.Windows. Forms.MouseEven tArgs e)
{
isMouseDown = false;
}
/*End Code*/

[Stoitcho Goutsev \(100\)]

Re: Moving objects

AM,

If I were you I would derive a new class from list box and in this new class
I would override WndProc and process WM_NCHITTEST message to return
HTCAPTION. This way the windows will handle all the moving of the cotnrol.

Here is basically how the WndProc can be written:

private const int WM_NCHITTEST = 0x84;
private const int HTCAPTION = 0x2;
private const int HTCLIENT = 0x1;

protected override void WndProc(ref Message m)
{
base.WndProc (ref m);
if(m.Msg == WM_NCHITTEST && m.Result == new IntPtr(HTCLIENT ))
{
m.Result = new IntPtr(HTCAPTIO N);

}


--
HTH
Stoitcho Goutsev (100)


"AM Hulshoff" <AMHulshoff@dis cussions.micros oft.com> wrote in message
news:CDB44ED6-AE82-45A9-B0FE-EB0C31306313@mi crosoft.com...[color=blue]
> Can someone tell me how I can move an object, in this case a listbox, over
> a
> form. The code below works, but not when the form is custom sized. It
> works
> perfectly when the form is maximized. And what is the best way to give the
> object boundries to move within?
>
> Hope someone can help me.
> TIA,
> Arjan.
>
> /*Begin Code*/
> /*Source: MSDN*/
> void ListBox1MouseDo wn(object sender, System.Windows. Forms.MouseEven tArgs
> e)
> {
> int xOffset;
> int yOffset;
>
> if(e.Button == MouseButtons.Le ft)
> {
> xOffset = -e.X - SystemInformati on.FrameBorderS ize.Width;
> yOffset = -e.Y - SystemInformati on.CaptionHeigh t -
> SystemInformati on.FrameBorderS ize.Height;
> mouseOffset = new Point(xOffset, yOffset);
> isMouseDown = true;
> }
> }
>
> void ListBox1MouseMo ve(object sender, System.Windows. Forms.MouseEven tArgs
> e)
> {
> if (isMouseDown)
> {
> Point mousePos = Control.MousePo sition;
> mousePos.Offset (mouseOffset.X, mouseOffset.Y);
> listBox1.Locati on = mousePos;
> }
> }
>
> void ListBox1MouseUp (object sender, System.Windows. Forms.MouseEven tArgs e)
> {
> isMouseDown = false;
> }
> /*End Code*/[/color]

[Ignacio Machin \( .NET/ C# MVP \)]

Re: Moving objects

Hi,

You should check the current position of the mouse and make sure it's inside
the boundary you want.

You should probably need to change from SystemInformati on.FrameBorderS ize
to another way to get the origin point


--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"AM Hulshoff" <AMHulshoff@dis cussions.micros oft.com> wrote in message
news:CDB44ED6-AE82-45A9-B0FE-EB0C31306313@mi crosoft.com...[color=blue]
> Can someone tell me how I can move an object, in this case a listbox, over
> a
> form. The code below works, but not when the form is custom sized. It
> works
> perfectly when the form is maximized. And what is the best way to give the
> object boundries to move within?
>
> Hope someone can help me.
> TIA,
> Arjan.
>
> /*Begin Code*/
> /*Source: MSDN*/
> void ListBox1MouseDo wn(object sender, System.Windows. Forms.MouseEven tArgs
> e)
> {
> int xOffset;
> int yOffset;
>
> if(e.Button == MouseButtons.Le ft)
> {
> xOffset = -e.X - SystemInformati on.FrameBorderS ize.Width;
> yOffset = -e.Y - SystemInformati on.CaptionHeigh t -
> SystemInformati on.FrameBorderS ize.Height;
> mouseOffset = new Point(xOffset, yOffset);
> isMouseDown = true;
> }
> }
>
> void ListBox1MouseMo ve(object sender, System.Windows. Forms.MouseEven tArgs
> e)
> {
> if (isMouseDown)
> {
> Point mousePos = Control.MousePo sition;
> mousePos.Offset (mouseOffset.X, mouseOffset.Y);
> listBox1.Locati on = mousePos;
> }
> }
>
> void ListBox1MouseUp (object sender, System.Windows. Forms.MouseEven tArgs e)
> {
> isMouseDown = false;
> }
> /*End Code*/[/color]

[AM Hulshoff]

Re: Moving objects

That's what I tried, but everytime I move the object I get the same result.
The boundries is something I won't have much problems with. But that other
part is causing me a headache.

"Ignacio Machin ( .NET/ C# MVP )" wrote:
[color=blue]
> Hi,
>
> You should check the current position of the mouse and make sure it's inside
> the boundary you want.
>
> You should probably need to change from SystemInformati on.FrameBorderS ize
> to another way to get the origin point
>
>
> --
> Ignacio Machin,
> ignacio.machin AT dot.state.fl.us
> Florida Department Of Transportation[/color]