Solution to text coverage when the static control background is transparent

Solution to text coverage when the static control background is transparent

(15:21:24)

Reprinted

It with transparent text coverage

Category: VC

 

Hatemath

 

Introduction:

I haven't spent a long time on forum, but I have seen such problems in the VC area many times, and I often fail to discuss them:

After the static control is set to transparent and the text is changed, it will overwrite the previous text. How can this problem be solved?
Use PDC-> setbkmode (transparent );
After the control is set to transparent, the text of the control to be changed will overlap. If the control is not transparent, the text will not overlap. How can I change the text in transparent State?

I did not agree at first. I tried it in my spare time and found that the text does overlap. For example (to better illustrate the problem, I specially set the background and foreground ):

The reason is preliminarily explored. The conjecture should be static.The background of the widget is not refreshed in time.

The solution is force refresh.

Method 1: getdlgitem (idc_static)-> updatewindow ();

Invalid...
Method 2: getdlgitem (idc_static)-> redrawwindow ();

Invalid .......
Method 3: getdlgitem (idc_static)-> invalidate ();
Invalid .........

Method 4: Not yet? Tips

Setdlgitemtext (idc_static, ""); // use multiple spaces to overwrite the original text.

Setdlgitemtext (idc_static, "test ");

Depressed .......

Is it necessary to solve such a small problem in an advanced way?

This problem plagued me for several days and finally suddenly realized at WC: the static background is transparent, so the residual text should be painted in the static parent window. After epiphany, I sighed: I am so stupid.

The solution is as follows: After setting new text (not before!) Refresh the parent window.

Void cteststaticdlg: ontimer (uint nidevent)

{

Cstring strtime;

Ctime time = ctime: getcurrenttime ();

Strtime = time. Format ("% Y % m month % d % H: % m: % s ");

 

Getdlgitem (idc_static)-> setwindowtext (strtime );

Getdlgitem (idc_static)-> getparent ()-> redrawwindow (); // these two sentences are just used.

Cdialog: ontimer (nidevent );

}

Compile and run, k.o.