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Two Easy ActiveX Questions

Shaheen
Shaheen asked
on
Medium Priority
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Last Modified: 2010-04-10
Questions:
      1 - How do I insert an icon into the ActiveX Control?
      2 - How do I prevent this ActiveX from Changing dimensions (at design and run time).
Regards
(NB: Its behaviour should be similar to a Timer Control (in VB) or a MSCOmm)
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Commented:
Edited text of question

Commented:
By icon, I would think you mean for the whole .OCX file, right?  If so, just add an icon to the resource.  Right click and get it's properties (ID, filename, etc).  For the ID, rename it as you wish, and put "= 101" after it.  This makes it the default icon for the file, e.g.:  IDI_MYOCXICON = 101

As far as the sizing, you can set the initial size in your Control's constructor by calling:
  SetInitialSize(XSize, YSize);

To prevent design/runtime sizing, handle it in the appropriate
COleControl member, perhaps OnSetExtent() or something like that.

Author

Commented:
can you please be more illustrative about the icon business?


Commented:
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Author

Commented:
can this icon be drawn on a form at design time (using the ActiveX control)?

Commented:
BTW, to limit the resizing of your control, override the OnSetExtend() method.  The method accepts one parameter, a pointer to a SIZEL structure that holds a HIMETRIC size.  If you're not sure what to do with the size, just take your size in pixels and convert it to HIMETRIC and compare it to the parameter passes in OnSetExtent().  If you're happy with the size, you can return TRUE, otherwise, if you don't like it, return FALSE.  If you don't want ANY resizing, just return FALSE and forget bothering with the parameter.  Here's the OnSetExtent() signature:

virtual BOOL COleControl::OnSetExtent(LPSIZEL lpSizeL)

The SIZEL structure is identical to SIZE, but uses Long integers for the size in HIMETRIC units.
The MFC documentation is unclear using CDC::HIMETRICToDP to convert HIMETRICs to SIZEs, but you can:

CDC* pMyDC = GetDC();  // get the control's DC
SIZE mySize;

mySize.cx = /* your horizontal required size in pixels */
mySize.cy = /* your vertical required size in pixels */

pMyDC->DPToHIMETRIC(&mySize);  // conversion

ReleaseDC(pMyDC); // done

// now just compare lpSizeL
BOOL bOK=(mySize.cx <= lpSizeL.cx) && (mySize.cy <= lpSizeL.cy);

return bOk;

--

At least that's supposed to work ;)


Commented:
If not, then a little hunting in the online help won't hurt either of us ;)

Commented:
As far as "drawing" an Icon in the icon's design-time, just add an icon, like you did above to make the OCX icon, then
load it using the windows ::LoadIcon() API.  You'll draw it using a few calls to paint it in your OnDraw() override:

void CMyOCX::OnDraw(CDC* pdc, ...) {
 // something similar to this
 pDC->FillSolidRect(rcBounds, ::GetSysColor(COLOR_3DFACE));

 HINSTANCE hInst = AfxGetResourceHandle();
 HICON hIcon = ::LoadIcon(hInst, IDI_MYPICTUREICON);

 if (hIcon) {
  pdc->DrawIcon(0, 0, hIcon);  // if you want your icon at 0, 0
 }
}

There 'tis.

Author

Commented:
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