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Windows: Fix maximizing frameless windows on secondary screens.

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They would either disappear or be positioned at bogus coordinates.

The MINMAXINFO structure works with coords from the primary screen
then uses an "interesting" algorithm to adjust to secondary screen:

Say you have a primary screen with width=1000 and secondary screen
with width=2000, here's what you get when you set ptMaxSize to:

ptMaxSize.x   | Size window gets in second screen
--------------------------------------------------
    500       |                500
    1000      |               2000
    1001      |               2001
    1100      |               2100

So basically you can't get any value between 1000 and 1999

How many people use the taskbar on a second display and maximimize
a frameless window anyway ?

Task-number: QTBUG-39537
Change-Id: Ic9b3120e7fb5a9a5d97828a2e44be02ae587b92e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
This commit is contained in:
Sérgio Martins 2014-06-11 12:54:21 +01:00 committed by The Qt Project
parent f65333b027
commit dbe6db192a
1 changed files with 6 additions and 3 deletions
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9
src/plugins/platforms/windows/qwindowswindow.cpp
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@ -1936,7 +1936,10 @@ void QWindowsWindow::getSizeHints(MINMAXINFO *mmi) const
&& (m_data.flags & Qt::FramelessWindowHint)) {
// This block fixes QTBUG-8361: Frameless windows shouldn't cover the
// taskbar when maximized
if (const QScreen *screen = effectiveScreen(window())) {
const QScreen *screen = effectiveScreen(window());
// Documentation of MINMAXINFO states that it will only work for the primary screen
if (screen && screen == QGuiApplication::primaryScreen()) {
mmi->ptMaxSize.y = screen->availableGeometry().height();
// Width, because you can have the taskbar on the sides too.
@ -1945,8 +1948,8 @@ void QWindowsWindow::getSizeHints(MINMAXINFO *mmi) const
// If you have the taskbar on top, or on the left you don't want it at (0,0):
mmi->ptMaxPosition.x = screen->availableGeometry().x();
mmi->ptMaxPosition.y = screen->availableGeometry().y();
} else {
qWarning() << "Invalid screen";
} else if (!screen){
qWarning() << "effectiveScreen() returned a null screen";
}
}