The MFC 4.2 (Visual Studio 6) is easy to implement by simply processing the WM_CTLCOLOR message under the dialog box class, and then the following code:
Copy Code code as follows:
Hbrush Calphaeditboxdlg::onctlcolor (cdc* PDC, cwnd* pwnd, UINT nCtlColor)
{
Hbrush HBR = Cdialog::onctlcolor (PDC, pwnd, nCtlColor);
Todo:change any attributes to the DC here
Pdc->setbkmode (Transparent);
Hbr= (Hbrush) getstockobject (Hollow_brush);
Todo:return a different brush if the default is not desired
return HBR;
}
Then invoke the invalidate in the related event of the edit control.
Copy Code code as follows:
void Calphaeditboxdlg::onkillfocuseditkey ()
{
Todo:add your control notification handler code here
Invalidate ();
}
void Calphaeditboxdlg::onkillfocuseditmessage ()
{
Todo:add your control notification handler code here
Invalidate ();
}
void Calphaeditboxdlg::onkillfocuseditpath ()
{
Todo:add your control notification handler code here
Invalidate ();
}
Don't forget to redraw the background if you delete the characters. Here's a list of only a few.
The new version of MFC is quite troublesome, because the background set to Clr_none or brush set as Hollow_brush, Microsoft will default to black background, this, Microsoft is really backwards. Less nonsense, edit control subclass inevitable, must deal with WM_PAINT, WM_CHAR, Wm_lbuttondown, wm_lbuttonup these several messages. If you want to get rid of the edit-controlled border, you have to process the wm_ncpaint message, but none of the code here is written in order to avoid performing the default Cdialogex::onncpaint () method to draw a border. The following code to achieve basic transparency effect, normal input no problem, if you want to implement delete, check and uncheck features, please append processing wm_lbuttondown, Wm_lbuttonup message.
Copy Code code as follows:
//////////////////////////////////////////////////////////////////////////
Draws a window.
//////////////////////////////////////////////////////////////////////////
void Cmyedit::onpaint ()
{
Paintstruct PS;
Textmetric TM;
int nselstart=0,nselend=0,ndrawstart=0,ndrawlen=0,ntxtlen=0;
RECT R;
CBitmap B;
LPTSTR sz= (LPTSTR) calloc (1024,sizeof (TCHAR));
cpaintdc* d2= (cpaintdc*) BeginPaint (&PS);
CDC D1;
CFont F;
cwnd* p=getparent ();
Ntxtlen=getwindowtext (sz,1024);
B.loadbitmap (IDB_BITMAP1);
D1. CreateCompatibleDC (P->GETDC ());
GetWindowRect (&R);
P->screentoclient (&R);
D1. SelectObject (b);
D2->bitblt (0,0,r.right-r.left,r.bottom-r.top,&d1,r.left,r.top,srccopy);
F.createfontindirect (&M_LF);
D2->selectobject (f);
D2->setbkmode (Transparent);
D2->gettextmetrics (&TM);
GetSel (Nselstart,nselend);
if (r.right-r.left<ntxtlen*tm.tmavecharwidth)
{
Ndrawstart=0-tm.tmavecharwidth*nselstart;
Ndrawlen= (r.right-r.left)/tm.tmavecharwidth;
}
Else
{
ndrawstart=0;
Ndrawlen=ntxtlen;
}
D2->textout (Ndrawstart,3,sz,ndrawlen);
D2->selectobject (Getstockobject (Null_brush));
D2->selectobject (CreatePen (Ps_dot,1,rgb (255,0,0)));
D2->rectangle (0,0,r.right-r.left,r.bottom-r.top);
Point pt;
Pt=getcaretpos ();
Pt.x=ndrawlen*tm.tmavecharwidth;
Setcaretpos (PT);
Delete sz;
EndPaint (&PS);
}
//////////////////////////////////////////////////////////////////////////
The Sticky keys and function keys are not dealt with in 2 cases.
//////////////////////////////////////////////////////////////////////////
void Cmyedit::onchar (UINT nChar, UINT nrepcnt, UINT nflags)
{
Textmetric TM;
int nselstart=0,nselend=0,ndrawstart=0,ndrawlen=0,ntxtlen=0;
RECT R;
CBitmap B;
LPTSTR sz= (LPTSTR) calloc (1024,sizeof (TCHAR));
LPTSTR input= (LPTSTR) calloc (1024,sizeof (TCHAR));
CClientDC D2 (this);
CDC D1;
CFont F;
cwnd* p=getparent ();
Ntxtlen=getwindowtext (sz,1024);
wsprintf (input,l "%c", NChar);
Lstrcat (Sz,input);
SetWindowText (SZ);
B.loadbitmap (IDB_BITMAP1);
D1. CreateCompatibleDC (P->GETDC ());
GetWindowRect (&R);
P->screentoclient (&R);
D1. SelectObject (b);
D2. BitBlt (0,0,r.right-r.left,r.bottom-r.top,&d1,r.left,r.top,srccopy);
F.createfontindirect (&M_LF);
D2. SelectObject (f);
D2. SetBkMode (Transparent);
D2. GetTextMetrics (&TM);
GetSel (Nselstart,nselend);
if (r.right-r.left<ntxtlen*tm.tmavecharwidth)
{
Ndrawstart=0-tm.tmavecharwidth*nselstart;
Ndrawlen= (r.right-r.left)/tm.tmavecharwidth;
}
Else
{
ndrawstart=0;
Ndrawlen=ntxtlen;
}
D2. TextOut (Ndrawstart,3,sz,ndrawlen);
D2. SelectObject (Getstockobject (Null_brush));
D2. SelectObject (CreatePen (Ps_dot,1,rgb (255,0,0)));
D2. Rectangle (0,0,r.right-r.left,r.bottom-r.top);
Point pt;
Pt=getcaretpos ();
Pt.x=ndrawlen*tm.tmavecharwidth;
Setcaretpos (PT);
Delete sz;
Delete input;
Cedit::onchar (NChar, nrepcnt, nflags);
}
That's all for now. How to implement a feature that is not implemented in annotations. I'm a rookie, please don't be laughed at. I hope you can show me a lot of advice.
