Question

Z-order issue with CBitmapButton

Asked by: microwhat

I have two CBitmapButtons. One is dragable by the mouse, the other is static on the screen. It is essentially a slider control made just from CbItmapButtons.

In, OnInitDialog() I call,
ButtonBase.Create(_T("btnbase"),WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON|BS_OWNERDRAW,CRect(varx,vary,20,20),this, IDC_BBASE);
ButtonBase.LoadBitmapFF(String here);
ButtonBase.SizeToContent();
Button1.Create(_T("btn1"),WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON|BS_OWNERDRAW,CRect(var1x,var1y,59,62),this, IDC_SETL);
Button1.LoadBitmapFF(String here);
Button2.Create(_T("btn2"),WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON|BS_OWNERDRAW,CRect(var2x,var2y,59,62),this, IDC_SETH);
Button2.LoadBitmapFF(String here);


This is basically what i have, Their is 30 of the base buttons(ButtonBase)
making a solid bar about 800 pixels long. Button1&2 are the position
indicators.

When i launch with this code the dialog comes up and the Position Button(Button2, aka "PB") is drawn under neath the Base Button(ButtonBase, aka "BB"). I've tried using every combination of SetWindowPos i can think of and also a few other functions like SetWindowPlacement.  I tried changing the order of the Create() functions above and using SetWindowPos and others.  Every time it comes out it either draws properly and you cant click it or it draws improperly and you can click it and then it looks fine. Right now with the above code i can call Button2.Invalidate() From a separate button press call of another button on the screen or i can call it X number of seconds from a separate thread that is sleeping upon start up.  It then redraws the PB on top of the BB properly. But if i try calling Button2.Invalidate() in OnInitDialog(), the PB does not draw on top of BB. It will Stay behind it.  Outside of making some kind of ungly work around i've run out of ideas.  Any help is appreciated.

Just a side note. The resource ID being used in the above code it the ID of button created through the resource editor.  The tab order is set properly on the buttons in the dialog.  But by creating these dynamically, i'm pretty sure it overrides the tab order from the resource editor. And the buttons have their "Visible" State set to "false" as they are just plain CButtons and im using bitmap buttons.

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Asked On
2009-10-29 at 15:10:53ID24856481
Tags

mfc

,

cbutton

,

cbitmapbutton

,

z-order

,

zorder

,

button

Topic

Windows MFC Programming

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: DanRollinsPosted on 2009-10-29 at 16:49:46ID: 25699259

I am assuming that you call CDialog::OnInitDialog early in your own OnInitDialog().

With proper setup, this should not happen.   The buttons should be drawn in Tab Order, so if the one you want topmost is drawn last, it should look correct.

That said... there is a trick I'vve used to get something down without a timer and to enforce a cetain sequence of events:

At the end of OnInitDialog(), post a user-defined message to yourself.  Just
    #define WM_ContinueInit (WM_APP+100)
...then...
   PostMessage( WM_ContinueInit );
or whatever (if you need help with this let me know).  It's important to use PostMessage (not SendMessage).  

The result is that the dialog is completely initialized when your "WM_ContinueInit" handler gets control.  At that point, you can Invalidate, move, set topmost, etc... whatever makes things work right.

 

by: DanRollinsPosted on 2009-10-29 at 16:51:11ID: 25699263

Another tip:  Use Spy++ to eyeball the controls.  Looking at the NextChild, etc. window relationships might shake something loose that explains what's happening.

 

by: pgnatyukPosted on 2009-10-29 at 17:10:23ID: 25699332

If I understand the question, SetWindowPos should be enough - with HWND_TOP or HWND_TOPMOST (&wdnTopMost in MFC). You need to change the z-order. Can you show the line with SetWindowPos that does not work? Something like the following:

 pBtn->SetWindowPos(&CWnd::wndTop, 0, 0, 0, 0,
     SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE);

Do you control the focus? Which button is focused when you see the problem? Probably, not the PB?

 

by: microwhatPosted on 2009-10-30 at 10:22:29ID: 25705075

Thanks for the quick reply Dan.  It works now, although its a work around.  I don't have the time to figure out what the little discrepancy is.  Question now is will it give me anymore issues when i add another button in between these two...:)  Nothing can ever be simple.

pgnatyuk, i had previously tried that.  Not sure if i tried it exactly like that so i gave it another try and i got one of the same results as before. The PB Draw underneath the BB. But when you click it, it brings it right to the top and stay on top the rest of the time. Worked, but only half way.  Thanks though.

Would like to make one note, thanks for assuming the obvious and not nit picking little things i left out, and turning the whole thing into flaming requiring a explanation for every little thing when it's not needed.

20120131-EE-VQP-002

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