drag and drop mouse

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4 total messages Started by Jeff Kish Wed, 26 Mar 2003 20:57

#17415

Author: Jeff Kish
Date: Wed, 26 Mar 2003 20:57

39 lines
1890 bytes

Greetings.

Is there a code snippet appropriate for cbuilder that shows the best
way to display a image/wireframe/box/whatever when the user is
operating the mouse to select stuff (i.e. between the mouse down and
mouse up)?

I have some c code that does it, but I thought there might be a better
way to to it in cbuilder, given all the events it allows you to
capture. I am dealing with a TPanel on a form.

Thanks
Jeff
p.s. the c code basically does this upon a mouse down message:

set capture
//eat mouse messages until a wm_lbuttonup is encountered
//meanwhile drawing your desired box/rubberband/whatever
for (;;)
{
	if (PeekMesage(msg, 0, WM_MOUSEFIRST, WM_MOUSELAST,
PM_REMOVE))
	{
	    DrawStuff();
	   if (msg.message == WM_LBUTTONUP)
	   {
	      result = true;
	   break;
	   }
	   if (msg.message == WM_RBUTTONUP)
	   {
	      result = false;
	      break;
	   }
	   continue;
	}
	ReleaseCapture();
	return result;// true means something was captured
}

Re: drag and drop mouse

#17406

Author: Rodolfo Frino - Stargate Softwar...
Date: Wed, 26 Mar 2003 21:30

42 lines
2178 bytes

You can create (or maybe display) a "box" (in this example a TRichEdit
control)
when the mouse goes down on your panel, and destroy (or maybe hide) the
"box"
when the mouse goes up on your panel (or held down and moved away from the
panel
and then released) by using the  event handlers corresponding to the
OnMouseDown and OnMouseUp events:

TRichEdit* p1;

void __fastcall TForm1::Panel1MouseDown(TObject *Sender,
      TMouseButton Button, TShiftState Shift, int X, int Y)
{
  if (Button == mbLeft)
  {
      // Create your component here
      p1 = new TRichEdit(this);
      p1->Parent = this;
      //...
  }
}


void __fastcall TForm1::Panel1MouseUp(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{
  if (Button == mbLeft)
      delete p1;         // Destroy your component here

}

Rodolfo

"Jeff Kish" <jeff.kish@mro.com> wrote in message
news:ri448vcicvl3p405t80aohjaeancic9b93@4ax.com...
> Greetings.
>
> Is there a code snippet appropriate for cbuilder that shows the best
> way to display a image/wireframe/box/whatever when the user is
> operating the mouse to select stuff (i.e. between the mouse down and
> mouse up)?

Re: drag and drop mouse

#17398

Author: Rodolfo Frino - Stargate Softwar...
Date: Wed, 26 Mar 2003 21:32

3 lines
1029 bytes

I forgot, this solution uses VCL not API's

Rodolfo

Re: drag and drop mouse

#17200

Author: Jeff Kish
Date: Wed, 02 Apr 2003 18:54

57 lines
2765 bytes

On Thu, 27 Mar 2003 08:30:46 +1100, "Rodolfo Frino - Stargate
Software" <starcinema@eftel.com> wrote:

>You can create (or maybe display) a "box" (in this example a TRichEdit
>control)
>when the mouse goes down on your panel, and destroy (or maybe hide) the
>"box"
>when the mouse goes up on your panel (or held down and moved away from the
>panel
>and then released) by using the  event handlers corresponding to the
>OnMouseDown and OnMouseUp events:
>
>TRichEdit* p1;
>
>void __fastcall TForm1::Panel1MouseDown(TObject *Sender,
>      TMouseButton Button, TShiftState Shift, int X, int Y)
>{
>  if (Button == mbLeft)
>  {
>      // Create your component here
>      p1 = new TRichEdit(this);
>      p1->Parent = this;
>      //...
>  }
>}
>
>
>void __fastcall TForm1::Panel1MouseUp(TObject *Sender, TMouseButton Button,
>      TShiftState Shift, int X, int Y)
>{
>  if (Button == mbLeft)
>      delete p1;         // Destroy your component here
>
>}
>
>Rodolfo
>
>"Jeff Kish" <jeff.kish@mro.com> wrote in message
>news:ri448vcicvl3p405t80aohjaeancic9b93@4ax.com...
>> Greetings.
>>
>> Is there a code snippet appropriate for cbuilder that shows the best
>> way to display a image/wireframe/box/whatever when the user is
>> operating the mouse to select stuff (i.e. between the mouse down and
>> mouse up)?
>
Thanks for the reply. I am not sure I made myself clear, but  it seems
like this is a different way of approaching the problem.
I just want to be able to have a wire-frame box like so many apps do
when selecting an area to "select" or "zoom".

I was actually looking for a vcl friendly way to do this, or perhaps
find out if there was reasons the way I had mentioned were not
advisable.

Thanks again,
Jeff Kish

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