自绘按钮

Question

我在对话框上加了4个自绘按钮,
当对话框第一次显示的时候它们都
不显示的.
当我点击他们就正常了.
请问怎么半啊?

Answer 1

还有,调用按钮的invalidate不管用啊!!

Answer 2

这是button的代码:
// CPCButtonIMPLEMENT_DYNAMIC(CPCButton, CButton)
CPCButton::CPCButton()
{
UseBitmap=false;
}CPCButton::~CPCButton()
{
}
BEGIN_MESSAGE_MAP(CPCButton, CButton)
ON_WM_PAINT()
END_MESSAGE_MAP()// CPCButton 消息处理程序
void CPCButton::LoadBitmap(CString name)
{
HBITMAP h;
h=(HBITMAP)LoadImage(NULL,name,IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION|LR_DEFAULTSIZE|LR_LOADFROMFILE);
if(h==NULL)
{
MessageBox(name+"load "+" failed");
//exit(1);
return ;
}
else
bitmap.Attach(h);
UseBitmap=true;
}void CPCButton::OnPaint()
{
CPaintDC dc(this); // device context for painting
// TODO: 在此处添加消息处理程序代码
// 不为绘图消息调用 CButton::OnPaint()
CRect rect;
GetClientRect();
if(UseBitmap)
{
CDC doc;
if(!doc.CreateCompatibleDC(&dc))
return ;
BITMAP bmp;
bitmap.GetBitmap(&bmp);
doc.SelectObject(&bitmap);

dc.StretchBlt(rect.left,rect.top,rect.Width(),rect.Height(),&doc,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);
}
else
{
CBrush *old=dc.SelectObject(&brush);
dc.FillRect(&rect,&brush);
dc.SelectObject(old);
}
int nOldMode;nOldMode= dc.SetBkMode(TRANSPARENT);
CString text;
GetWindowText(text);
CFont font;
font.CreatePointFont(1,"宋体",&dc);
CFont *of=dc.SelectObject(&font);
//rc.DeflateRect(2,2,2,2);
dc.DrawText(text, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE);
dc.SelectObject(of);
dc.SetBkMode(nOldMode);

}void CPCButton::SetColor(COLORREF c)
{
color=c;
brush.CreateSolidBrush(color);
UseBitmap=false;
}void CPCButton::PreSubclassWindow()
{
// TODO: 在此添加专用代码和/或调用基类
ModifyStyle(0,BS_OWNERDRAW);
CButton::PreSubclassWindow();
}void CPCButton::DrawItem(LPDRAWITEMSTRUCT lp)
{ // TODO:  添加您的代码以绘制指定项
CDC dc;
dc.Attach(lp->hDC);
CRect rect=lp->rcItem;

if(UseBitmap)
{
CDC doc;
if(!doc.CreateCompatibleDC(&dc))
return ;
BITMAP bmp;
bitmap.GetBitmap(&bmp);
doc.SelectObject(&bitmap);

dc.StretchBlt(rect.left,rect.top,rect.Width(),rect.Height(),&doc,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);
}
else
{
CBrush *old=dc.SelectObject(&brush);
dc.FillRect(&rect,&brush);
dc.SelectObject(old);
}
int nOldMode;nOldMode= dc.SetBkMode(TRANSPARENT);
CString text;
GetWindowText(text);
CFont font;
font.CreatePointFont(1,"宋体",&dc);
CFont *of=dc.SelectObject(&font);
//rc.DeflateRect(2,2,2,2);
dc.DrawText(text, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE);
dc.SelectObject(of);
dc.SetBkMode(nOldMode);
if(lp->itemState&ODS_SELECTED)
{
dc.Draw3dRect(&rect,GetSysColor(COLOR_3DDKSHADOW),
            GetSysColor(COLOR_3DHILIGHT));
}
else
{
dc.Draw3dRect(&rect,GetSysColor(COLOR_3DHILIGHT),
            GetSysColor(COLOR_3DDKSHADOW));
}
}

Answer 3

onPaint的代码是实在无奈才加上去的.
这是dlg的代码:// CLoginDlg 对话框IMPLEMENT_DYNAMIC(CLoginDlg, CDialog)
CLoginDlg::CLoginDlg(CWnd* pParent /*=NULL*/)
: CDialog(CLoginDlg::IDD, pParent)
{
}CLoginDlg::~CLoginDlg()
{
}void CLoginDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_STATIC3, QQnumber);
DDX_Control(pDX, IDC_STATIC2, QQpassword);
DDX_Control(pDX, IDC_STATIC1, QQmode);
DDX_Control(pDX, IDC_BUTTON1, SetIT);
DDX_Control(pDX, IDC_BUTTON2, Login);
DDX_Control(pDX, IDC_BUTTON3, Cancel);
DDX_Control(pDX, IDC_BUTTON4, Require);
}
BEGIN_MESSAGE_MAP(CLoginDlg, CDialog)
ON_WM_ERASEBKGND()
ON_WM_CTLCOLOR()
ON_BN_CLICKED(IDC_BUTTON1, OnBnClickedButton1)
ON_BN_CLICKED(IDC_BUTTON2, OnBnClickedButton2)
ON_BN_CLICKED(IDC_BUTTON3, OnBnClickedButton3)
ON_BN_CLICKED(IDC_BUTTON4, OnBnClickedButton4)
ON_WM_PAINT()
ON_WM_SIZE()
END_MESSAGE_MAP()
// CLoginDlg 消息处理程序BOOL CLoginDlg::OnInitDialog()
{
CDialog::OnInitDialog(); // TODO:  在此添加额外的初始化
//::SetWindowLong(GetSafeHwnd(), GWL_EXSTYLE, WS_EX_TOOLWINDOW); 
HICON ico=AfxGetApp()->LoadIcon(IDR_MAINFRAME);
SetIcon(ico,FALSE);
HBITMAP h;
h=(HBITMAP)LoadImage(NULL,theApp.dir+"\\login.bmp",IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION|LR_DEFAULTSIZE|LR_LOADFROMFILE);
if(h==NULL)
{
MessageBox(theApp.dir+"login.bmp"+"load "+" failed");
//exit(1);
return FALSE;
}
else
loginBmp.Attach(h); QQnumber.SetColor(RGB(224,225,230));
QQpassword.SetColor(RGB(224,225,230));
QQmode.SetColor(RGB(224,225,230));   SetIT.SetColor(RGB(224,225,230));
  Login.SetColor(RGB(224,225,230));
  Cancel.SetColor(RGB(224,225,230));
  Require.SetColor(RGB(224,225,230));
Require.Invalidate();
SetIT.Invalidate();
Login.Invalidate();
   
return TRUE;  // return TRUE unless you set the focus to a control
// 异常: OCX 属性页应返回 FALSE
}BOOL CLoginDlg::OnEraseBkgnd(CDC* pDC)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值

//CDC *pDC=GetDC();
CRect rect;
GetClientRect(&rect);
CDC dc;
if(!dc.CreateCompatibleDC(pDC))
return FALSE;
BITMAP bmp;
loginBmp.GetBitmap(&bmp);
dc.SelectObject(&loginBmp);

pDC->StretchBlt(rect.left,rect.top,rect.Width(),rect.Height(),&dc,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);

return TRUE;
//return CDialog::OnEraseBkgnd(pDC);
}