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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QTest>
#include <QtCore/qoperatingsystemversion.h>
#include <QtWidgets/qapplication.h>
#include <QtWidgets/qstylefactory.h>
#include <QtWidgets/qwidget.h>
#include <qt_windows.h>
#include <dwmapi.h>
using namespace Qt::StringLiterals;
#ifdef Q_CC_MSVC
static constexpr auto dwmaWindowCornerPreference = DWMWA_WINDOW_CORNER_PREFERENCE;
static constexpr uint32_t dwmcpDefault = DWMWCP_DEFAULT;
static constexpr uint32_t dwmcpRound = DWMWCP_ROUND;
#else
// MinGW 13.1.0 does not provide this
static constexpr auto dwmaWindowCornerPreference = 33;
static constexpr uint32_t dwmcpDefault = 0;
static constexpr uint32_t dwmcpRound = 2;
#endif
static uint32_t cornerPreference(const QWidget *widget)
{
uint32_t pref = 0;
const auto hwnd = reinterpret_cast<HWND>(const_cast<QWidget *>(widget)->winId());
if (FAILED(DwmGetWindowAttribute(hwnd, dwmaWindowCornerPreference, &pref, sizeof(pref))))
return uint32_t(-1);
return pref;
}
class tst_QWindows11Style : public QObject
{
Q_OBJECT
private slots:
void initTestCase();
void cornerPreferenceOnFullScreen();
void cornerPreferenceOnShowFullScreen();
};
void tst_QWindows11Style::initTestCase()
{
if (QGuiApplication::platformName() != QLatin1StringView("windows"))
QSKIP("This test requires the Windows platform plugin.");
if (QOperatingSystemVersion::current() < QOperatingSystemVersion::Windows11_21H2)
QSKIP("Native rounded top level windows require Windows 11.");
QStyle *style = QStyleFactory::create(u"windows11"_s);
if (!style)
QSKIP("The windows11 style is not available.");
QApplication::setStyle(style);
}
// QTBUG-147453: A fullscreen window must not have rounded corners, so the
// corner preference must be DWMWCP_DEFAULT. When the window leaves
// fullscreen, the corners must be rounded again.
void tst_QWindows11Style::cornerPreferenceOnFullScreen()
{
QWidget widget;
widget.show();
QVERIFY(QTest::qWaitForWindowExposed(&widget));
if (cornerPreference(&widget) == uint32_t(-1))
QSKIP("DwmGetWindowAttribute does not support the corner preference.");
QTRY_COMPARE(cornerPreference(&widget), dwmcpRound);
widget.showFullScreen();
QVERIFY(QTest::qWaitForWindowExposed(&widget));
QTRY_COMPARE(cornerPreference(&widget), dwmcpDefault);
widget.showNormal();
QVERIFY(QTest::qWaitForWindowExposed(&widget));
QTRY_COMPARE(cornerPreference(&widget), dwmcpRound);
}
void tst_QWindows11Style::cornerPreferenceOnShowFullScreen()
{
QWidget widget;
widget.showFullScreen();
QVERIFY(QTest::qWaitForWindowExposed(&widget));
if (cornerPreference(&widget) == uint32_t(-1))
QSKIP("DwmGetWindowAttribute does not support the corner preference.");
QTRY_COMPARE(cornerPreference(&widget), dwmcpDefault);
widget.showNormal();
QVERIFY(QTest::qWaitForWindowExposed(&widget));
QTRY_COMPARE(cornerPreference(&widget), dwmcpRound);
}
QTEST_MAIN(tst_QWindows11Style)
#include "tst_qwindows11style.moc"