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Windows styles/wizard: Do not invoke winId() of desktop windows

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Call the Win32 API GetDesktopWindow() to obtain a HWND of the desktop
instead of calling QApplicationPrivate::getHWNDForWidget() for desktop
windows. This allows for lazily creating desktop platform windows.

Observed in some tests where no window is visible.

Change-Id: I97074f69606b3d74f3fbc90acb4a077d52eeb84d
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
Friedemann Kleint 2017-02-13 16:24:47 +01:00 committed by Tor Arne Vestbø
parent 5c440880ba
commit 071a120400
2 changed files with 4 additions and 13 deletions
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9
src/widgets/dialogs/qwizard_win.cpp
View File

@ -215,8 +215,7 @@ void QVistaHelper::disconnectBackButton()
QColor QVistaHelper::basicWindowFrameColor()
{
DWORD rgb;
HWND handle = QApplicationPrivate::getHWNDForWidget(QApplication::desktop());
const HANDLE hTheme = OpenThemeData(handle, L"WINDOW");
const HANDLE hTheme = OpenThemeData(GetDesktopWindow(), L"WINDOW");
GetThemeColor(hTheme, WP_CAPTION, CS_ACTIVE,
wizard->isActiveWindow() ? TMT_FILLCOLORHINT : TMT_BORDERCOLORHINT, &rgb);
BYTE r = GetRValue(rgb);
@ -258,8 +257,7 @@ static LOGFONT getCaptionLogFont(HANDLE hTheme)
static bool getCaptionQFont(int dpi, QFont *result)
{
const HANDLE hTheme =
OpenThemeData(QApplicationPrivate::getHWNDForWidget(QApplication::desktop()), L"WINDOW");
const HANDLE hTheme = OpenThemeData(GetDesktopWindow(), L"WINDOW");
if (!hTheme)
return false;
// Call into QWindowsNativeInterface to convert the LOGFONT into a QFont.
@ -590,8 +588,7 @@ bool QVistaHelper::drawTitleText(QPainter *painter, const QString &text, const Q
if (vistaState() == VistaAero) {
const QRect rectDp = QRect(rect.topLeft() * QVistaHelper::m_devicePixelRatio,
rect.size() * QVistaHelper::m_devicePixelRatio);
HWND handle = QApplicationPrivate::getHWNDForWidget(QApplication::desktop());
const HANDLE hTheme = OpenThemeData(handle, L"WINDOW");
const HANDLE hTheme = OpenThemeData(GetDesktopWindow(), L"WINDOW");
if (!hTheme) return false;
// Set up a memory DC and bitmap that we'll draw into
HDC dcMem;

8
src/widgets/styles/qwindowsxpstyle.cpp
View File

@ -397,13 +397,7 @@ HWND QWindowsXPStylePrivate::winId(const QWidget *widget)
return topLevelHwnd;
}
if (QDesktopWidget *desktop = qApp->desktop())
if (const HWND desktopHwnd = QApplicationPrivate::getHWNDForWidget(desktop))
return desktopHwnd;
Q_ASSERT(false);
return 0;
return GetDesktopWindow();
}
/*! \internal