diff options
Diffstat (limited to 'src/plugins/platforms/windows/qwindowswindow.cpp')
-rw-r--r-- | src/plugins/platforms/windows/qwindowswindow.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp index a53de8f71d..63c271a79c 100644 --- a/src/plugins/platforms/windows/qwindowswindow.cpp +++ b/src/plugins/platforms/windows/qwindowswindow.cpp @@ -468,14 +468,21 @@ static bool shouldShowMaximizeButton(const QWindow *w, Qt::WindowFlags flags) w->maximumSize() == QSize(QWINDOWSIZE_MAX, QWINDOWSIZE_MAX); } +bool QWindowsWindow::hasNoNativeFrame(HWND hwnd, Qt::WindowFlags flags) +{ + const LONG_PTR style = GetWindowLongPtr(hwnd, GWL_STYLE); + return (style & WS_CHILD) || (flags & Qt::FramelessWindowHint); +} + // Set the WS_EX_LAYERED flag on a HWND if required. This is required for // translucent backgrounds, not fully opaque windows and for // Qt::WindowTransparentForInput (in combination with WS_EX_TRANSPARENT). bool QWindowsWindow::setWindowLayered(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, qreal opacity) { const LONG_PTR exStyle = GetWindowLongPtr(hwnd, GWL_EXSTYLE); + // Native children are frameless by nature, so check for that as well. const bool needsLayered = (flags & Qt::WindowTransparentForInput) - || (hasAlpha && (flags & Qt::FramelessWindowHint)) || opacity < 1.0; + || (hasAlpha && hasNoNativeFrame(hwnd, flags)) || opacity < 1.0; const bool isLayered = (exStyle & WS_EX_LAYERED); if (needsLayered != isLayered) { if (needsLayered) { @@ -491,7 +498,7 @@ static void setWindowOpacity(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, bo { if (QWindowsWindow::setWindowLayered(hwnd, flags, hasAlpha, level)) { const BYTE alpha = BYTE(qRound(255.0 * level)); - if (hasAlpha && !accelerated && (flags & Qt::FramelessWindowHint)) { + if (hasAlpha && !accelerated && QWindowsWindow::hasNoNativeFrame(hwnd, flags)) { // Non-GL windows with alpha: Use blend function to update. BLENDFUNCTION blend = {AC_SRC_OVER, 0, alpha, AC_SRC_ALPHA}; UpdateLayeredWindow(hwnd, nullptr, nullptr, nullptr, nullptr, nullptr, 0, &blend, ULW_ALPHA); |