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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qwindowswindowclassdescription.h"
#include <QtGui/qwindow.h>
#include "qwindowswindowclassregistry.h"
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
QString QWindowsWindowClassDescription::classNameSuffix(Qt::WindowFlags type, unsigned int style, bool hasIcon)
{
QString suffix;
switch (type) {
case Qt::Popup:
suffix += "Popup"_L1;
break;
case Qt::Tool:
suffix += "Tool"_L1;
break;
case Qt::ToolTip:
suffix += "ToolTip"_L1;
break;
default:
break;
}
if (style & CS_DROPSHADOW)
suffix += "DropShadow"_L1;
if (style & CS_SAVEBITS)
suffix += "SaveBits"_L1;
if (style & CS_OWNDC)
suffix += "OwnDC"_L1;
if (hasIcon)
suffix += "Icon"_L1;
return suffix;
}
bool QWindowsWindowClassDescription::computeHasIcon(Qt::WindowFlags flags, Qt::WindowFlags type)
{
bool hasIcon = true;
switch (type) {
case Qt::Tool:
case Qt::ToolTip:
case Qt::Popup:
hasIcon = false;
break;
case Qt::Dialog:
if (!(flags & Qt::WindowSystemMenuHint))
hasIcon = false; // QTBUG-2027, dialogs without system menu.
break;
}
return hasIcon;
}
QWindowsWindowClassDescription QWindowsWindowClassDescription::fromName(QString name, WNDPROC procedure)
{
return { std::move(name), procedure };
}
QWindowsWindowClassDescription QWindowsWindowClassDescription::fromWindow(const QWindow *window, WNDPROC procedure)
{
Q_ASSERT(window);
QWindowsWindowClassDescription description;
description.procedure = procedure;
const Qt::WindowFlags flags = window->flags();
const Qt::WindowFlags type = flags & Qt::WindowType_Mask;
// Determine style and icon.
description.style = CS_DBLCLKS;
description.hasIcon = computeHasIcon(flags, type);
// The following will not set CS_OWNDC for any widget window, even if it contains a
// QOpenGLWidget or QQuickWidget later on. That cannot be detected at this stage.
if (window->surfaceType() == QSurface::OpenGLSurface || (flags & Qt::MSWindowsOwnDC))
description.style |= CS_OWNDC;
if (!(flags & Qt::NoDropShadowWindowHint)
&& (type == Qt::Popup || window->property("_q_windowsDropShadow").toBool())) {
description.style |= CS_DROPSHADOW;
}
switch (type) {
case Qt::Tool:
case Qt::ToolTip:
case Qt::Popup:
description.style |= CS_SAVEBITS; // Save/restore background
break;
}
description.name = "QWindow"_L1 + classNameSuffix(type, description.style, description.hasIcon);
return description;
}
QDebug operator<<(QDebug dbg, const QWindowsWindowClassDescription &description)
{
dbg << description.name
<< " style=0x" << Qt::hex << description.style << Qt::dec
<< " brush=" << description.brush
<< " hasIcon=" << description.hasIcon;
return dbg;
}
QT_END_NAMESPACE
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