DwmDefWindowProc
is required to handle caption buttons. From msdn:
For caption button hit testing, DWM provides the DwmDefWindowProc
function. To properly hit test the caption buttons in custom frame
scenarios, messages should first be passed to DwmDefWindowProc
for
handling. DwmDefWindowProc
returns TRUE
if a message is handled and
FALSE
if it is not. If the message is not handled by DwmDefWindowProc
,
your application should handle the message itself or pass the message
onto DefWindowProc
.
In MFC it can work out as follows:
LRESULT cframeWnd::OnNcHitTest(CPoint p)
{
BOOL dwm_enabled = FALSE;
if (SUCCEEDED(DwmIsCompositionEnabled(&dwm_enabled)))
{
LRESULT result = 0;
if (!DwmDefWindowProc(m_hWnd, WM_NCHITTEST, 0, MAKELPARAM(p.x, p.y), &result))
result = HitTestNCA(m_hWnd, p);
if (result == HTNOWHERE && GetForegroundWindow() != this)
{
return HTCAPTION;
}
return result;
}
return CWnd::OnNcHitTest(p);
}
I added a fix with GetForegroundWindow()
, because the HitTestNCA
function from MSDN example is wrong, it doesn't return HTCLIENT
when it should. So when another window has focus, it won't switch windows upon mouse click in client area.
Also, there is a leak in OnNcPaint
:
CDC* dc = GetWindowDC();
Whenever GetWindowDC()
is called it should be followed by ReleaseDC
. Or just use CWindowDC
which has automatic cleanup. You don't actually need to override OnNcPaint
because frame has been extended to "client area".
Here is a full example:
class cglassWnd : public CWnd
{
void OnNcCalcSize(BOOL, NCCALCSIZE_PARAMS FAR*);
LRESULT OnNcHitTest(CPoint p);
void OnNcMouseLeave();
int OnCreate(LPCREATESTRUCT lpCreateStruct);
void OnActivate(UINT state, CWnd* otherWnd, BOOL minimized);
void OnPaint();
CRect borders;
int titlebar_height;
DECLARE_MESSAGE_MAP()
public:
cglassWnd();
};
BEGIN_MESSAGE_MAP(cglassWnd, CWnd)
ON_WM_NCHITTEST()
ON_WM_NCCALCSIZE()
ON_WM_NCMOUSELEAVE()
ON_WM_ACTIVATE()
ON_WM_CREATE()
ON_WM_PAINT()
END_MESSAGE_MAP()
cglassWnd::cglassWnd()
{
BOOL dwm_enabled = FALSE;
DwmIsCompositionEnabled(&dwm_enabled);
if (!dwm_enabled)
TRACE("Error: don't use this class, add error handling...");
//modified height for the new title bar
titlebar_height = 60;
}
int cglassWnd::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
int res = CWnd::OnCreate(lpCreateStruct);
//find border thickness
borders = { 0,0,0,0 };
if (GetWindowLongPtr(m_hWnd, GWL_STYLE) & WS_THICKFRAME)
{
AdjustWindowRectEx(&borders,
GetWindowLongPtr(m_hWnd, GWL_STYLE) & ~WS_CAPTION, FALSE, NULL);
borders.left = abs(borders.left);
borders.top = abs(borders.top);
}
else if (GetWindowLongPtr(m_hWnd, GWL_STYLE) & WS_BORDER)
{
borders = { 1,1,1,1 };
}
//Extend caption in to client area
MARGINS margins = { 0 };
margins.cyTopHeight = titlebar_height;
DwmExtendFrameIntoClientArea(m_hWnd, &margins);
SetWindowPos(NULL, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_FRAMECHANGED);
return res;
}
void cglassWnd::OnPaint()
{
CPaintDC dc(this);
//paint titlebar area (this used to be the non-client area)
CRect rc;
GetClientRect(&rc);
rc.bottom = titlebar_height;
//see MSDN reference for explanation of this code
//upside-down bitmap is for the sake of DrawThemeTextEx
CDC memdc;
memdc.CreateCompatibleDC(&dc);
BITMAPINFOHEADER infhdr = { sizeof(infhdr), rc.right, -rc.bottom, 1, 32 };
HBITMAP hbitmap = CreateDIBSection(dc,(BITMAPINFO*)(&infhdr),DIB_RGB_COLORS,0,0,0);
auto oldbitmap = memdc.SelectObject(hbitmap);
//do extra titlebar painting here
//for example put DrawThemeTextEx for window's name
dc.BitBlt(0, 0, rc.Width(), rc.Height(), &memdc, 0, 0, SRCCOPY);
memdc.SelectObject(oldbitmap);
DeleteObject(hbitmap);
//begin normal paint
//The new client area begins below titlebar_height which we define earlier
GetClientRect(&rc);
rc.top = titlebar_height;
dc.FillSolidRect(&rc, RGB(128, 128, 255));
}
void cglassWnd::OnNcCalcSize(BOOL validate, NCCALCSIZE_PARAMS FAR* sz)
{
if (validate)
{
sz->rgrc[0].left += borders.left;
sz->rgrc[0].right -= borders.right;
sz->rgrc[0].bottom -= borders.bottom;
}
else
{
CWnd::OnNcCalcSize(validate, sz);
}
}
LRESULT cglassWnd::OnNcHitTest(CPoint pt)
{
LRESULT result = 0;
//handle close/minimize/maximize button
if (DwmDefWindowProc(m_hWnd, WM_NCHITTEST, 0, MAKELPARAM(pt.x, pt.y), &result))
return result;
//cursor is over the frame or client area:
result = CWnd::OnNcHitTest(pt);
if (result == HTCLIENT)
{
ScreenToClient(&pt);
if (pt.y < borders.top) return HTTOP;
if (pt.y < titlebar_height) return HTCAPTION;
}
return result;
}
void cglassWnd::OnNcMouseLeave()
{
//This is for close/minimize/maximize/help buttons
LRESULT result;
DwmDefWindowProc(m_hWnd, WM_NCMOUSELEAVE, 0, 0, &result);
CWnd::OnNcMouseLeave();
}
void cglassWnd::OnActivate(UINT state, CWnd* otherWnd, BOOL minimized)
{
CWnd::OnActivate(state, otherWnd, minimized);
Invalidate(FALSE);
}