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Windows: Implement Qt::WindowStaysOnBottomHint

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Set the Z-order to HWND_BOTTOM in that case.
Add a doc note stating that it only works for frameless or
full screen windows.

Task-number: QTBUG-53717
Change-Id: I7abf219a88aac715c51d27d925504da9e91b56f1
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Andre de la Rocha <andre.rocha@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
This commit is contained in:
Friedemann Kleint 2018-08-01 12:59:42 +02:00
parent f0ff73f631
commit 66be5445e6
2 changed files with 8 additions and 2 deletions
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8
src/corelib/global/qnamespace.qdoc
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@ -2271,13 +2271,17 @@
correctly.
\value WindowStaysOnBottomHint Informs the window system that the
window should stay on bottom of all other windows. Note
that on X11 this hint will work only in window managers
window should stay on bottom of all other windows.
\note On X11, this hint will work only in window managers
that support _NET_WM_STATE_BELOW atom. If a window always
on the bottom has a parent, the parent will also be left on
the bottom. This window hint is currently not implemented
for \macos.
\note On Windows, this will work only for frameless or
full-screen windows.
\value WindowTransparentForInput Informs the window system that this window
is used only for output (displaying something) and does not take input.
Therefore input events should pass through as if it wasn't there.

2
src/plugins/platforms/windows/qwindowswindow.cpp
View File

@ -2081,6 +2081,8 @@ bool QWindowsWindow::handleGeometryChangingMessage(MSG *message, const QWindow *
HWND desktopHWND = GetDesktopWindow();
platformWindow->m_data.embedded = !parentWindow && parentHWND && (parentHWND != desktopHWND);
}
if (qWindow->flags().testFlag(Qt::WindowStaysOnBottomHint))
windowPos->hwndInsertAfter = HWND_BOTTOM;
}
if (!qWindow->isTopLevel()) // Implement hasHeightForWidth().
return false;