how to ownerdraw the button borders in VC++6.0 [modified]

[Krauze]

I've overriden the funx CMyButton::DrawItem(), and some lines in it are:

CDC\* pDC = CDC::FromHandle( lpDrawItemStruct->hDC );
CRect rc = lpDrawItemStruct->rcItem;
CPen pen( PS\_SOLID, 1, RGB(0,0,0) );
CPen \*pOld = pDC->SelectObject( &pen );
pDC->LineTo( rc.right, rc.top );
pDC->LineTo( rc.right, rc.bottom );
pDC->LineTo( rc.left, rc.bottom );
pDC->LineTo( rc.left, rc.top );
pDC->SelectObject( pOld );

But the prob occurs that only the upper and left borders drawn can be seen while the lower and right can't. At first, I thought it was caused by the 3D effect of the button. But though I've added BS_FLAT, the prob still exists. In fact, I can't use the following to draw the borders:

pDC->Rectangle( &rc );

Cos I want the button background to be transparent so that the back image of the dialog isn't covered. So anyone knows about this kinda prob and helps me out? Really thx!

modified on Tuesday, April 20, 2010 4:51 AM

[stebich]

1st I miss a pDC->MoveTo( rc.left, rc.top ); for the starting point before the first LineTo() 2nd Have you tried to change rc.bottom and rc.right? Decrement both should be enough to see the right and bottom lines. The rcItem rectangle defines the controls boundaries, painting outside this boundaries is prohibited by clipping.

[Krauze]

Really thx! In fact, pDC->MoveTo() isn't needed cos the GDI defines the starting point as the left-top automatically. And I use

rc.DeflateRect(0,0,1,1);

Thus the borders are all visible.