Implementation process of the Custom button

Implementation process of the Custom button

• Declare the custom property
• Responds to the vm_mesureitem event, indicating the button size.
• Re-responds to the vm_drawitem message, indicating how to draw a button

First, create a project in vc6, select MFC, and create a dialog project.

Enter the project name, delete the generated buttons, and add the two buttons again.

Set attributes for buttons

Select "self-painting", that is, you can map the image up.

Add the wm_drawitem attribute to the DLG class object.

Add the following code to the generated ondrawitem method:

 

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// Add a plotting functionvoid CMy40_mybuttonDlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)  {     // TODO: Add your message handler code here and/or call default     CDC ButtonDC;     CBitmap bitmapTrans;     BITMAP bmp;     CDC mem;     CRect rc;     // Obtain the DC used for drawing the button     ButtonDC.Attach(lpDrawItemStruct->hDC);     // Prepare a bitmap for transmission to the button Area     mem.CreateCompatibleDC(&ButtonDC);     // Obtain the size of the rectangle occupied by the button     rc=lpDrawItemStruct->rcItem;     // Obtain the current status of the button and draw different buttons based on different statuses.     UINT state = lpDrawItemStruct->itemState;     // If the button gets the focus, draw the button in the selected status     if(state&ODS_FOCUS)     {         bitmapTrans.LoadBitmap(IDB_BITMAP1);         bitmapTrans.GetBitmap(&bmp);         CBitmap *old=mem.SelectObject(&bitmapTrans);         // Transmit bitmap to the button location         // The purpose of using stretcnblt is to change the bitmap with the button size.         ButtonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);         mem.SelectObject(old);         bitmapTrans.DeleteObject();         // Set the text background to transparent         ButtonDC.SetBkMode(TRANSPARENT);         ButtonDC.DrawText("Selected",&rc,DT_CENTER|DT_VCENTER|DT_SINGLELINE);     }     else    {         bitmapTrans.LoadBitmap(IDB_BITMAP2);         CBitmap *old2 = mem.SelectObject(&bitmapTrans);         bitmapTrans.GetBitmap(&bmp);         CBitmap *old=mem.SelectObject(&bitmapTrans);         ButtonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);         ButtonDC.SetBkMode(TRANSPARENT);         ButtonDC.DrawText("Not selected",&rc,DT_CENTER|DT_VCENTER|DT_SINGLELINE);         mem.SelectObject(old2);         bitmapTrans.DeleteObject();     }       CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct); }

Compile and run the program. The result is as follows: