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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
// Qt-Security score:significant reason:default
#include "qwindowswindowclassregistry.h"
#include <QtCore/qlibraryinfo.h>
#include <QtCore/quuid.h>
#include "qwindowscontext.h"
#include "qwindowswindowclassdescription.h"
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
Q_LOGGING_CATEGORY(lcQpaWindowClass, "qt.qpa.windowclass")
QWindowsWindowClassRegistry *QWindowsWindowClassRegistry::m_instance = nullptr;
QWindowsWindowClassRegistry::QWindowsWindowClassRegistry(WNDPROC defaultProcedure)
: m_defaultProcedure(defaultProcedure)
{
m_instance = this;
}
QWindowsWindowClassRegistry::~QWindowsWindowClassRegistry()
{
unregisterWindowClasses();
m_instance = nullptr;
}
QWindowsWindowClassRegistry *QWindowsWindowClassRegistry::instance()
{
return m_instance;
}
QString QWindowsWindowClassRegistry::classNamePrefix()
{
static QString result;
if (result.isEmpty()) {
QTextStream str(&result);
str << "Qt" << QT_VERSION_MAJOR << QT_VERSION_MINOR << QT_VERSION_PATCH;
if (QLibraryInfo::isDebugBuild())
str << 'd';
#ifdef QT_NAMESPACE
# define xstr(s) str(s)
# define str(s) #s
str << xstr(QT_NAMESPACE);
# undef str
# undef xstr
#endif
}
return result;
}
QString QWindowsWindowClassRegistry::registerWindowClass(const QWindowsWindowClassDescription &description)
{
QString className = description.name;
if (description.shouldAddPrefix)
className = classNamePrefix() + className;
// since multiple Qt versions can be used in one process
// each one has to have window class names with a unique name
// The first instance gets the unmodified name; if the class
// has already been registered by another instance of Qt then
// add a UUID. The check needs to be performed for each name
// in case new message windows are added (QTBUG-81347).
// Note: GetClassInfo() returns != 0 when a class exists.
if (shouldDecorateWindowClassName(description))
className += QUuid::createUuid().toString();
if (m_registeredWindowClassNames.contains(className)) // already registered in our list
return className;
const auto appInstance = static_cast<HINSTANCE>(GetModuleHandle(nullptr));
WNDCLASSEX wc{};
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = description.style;
wc.lpfnWndProc = description.procedure;
wc.hInstance = appInstance;
wc.hbrBackground = description.brush;
if (description.hasIcon) {
wc.hIcon = static_cast<HICON>(LoadImage(appInstance, L"IDI_ICON1", IMAGE_ICON, 0, 0, LR_DEFAULTSIZE));
if (wc.hIcon) {
int sw = GetSystemMetrics(SM_CXSMICON);
int sh = GetSystemMetrics(SM_CYSMICON);
wc.hIconSm = static_cast<HICON>(LoadImage(appInstance, L"IDI_ICON1", IMAGE_ICON, sw, sh, 0));
}
else {
wc.hIcon = static_cast<HICON>(LoadImage(nullptr, IDI_APPLICATION, IMAGE_ICON, 0, 0, LR_DEFAULTSIZE | LR_SHARED));
}
}
wc.lpszClassName = reinterpret_cast<LPCWSTR>(className.utf16());
ATOM atom = RegisterClassEx(&wc);
if (!atom)
qCWarning(lcQpaWindowClass) << "Failed to register window class" << className
<< "(" << qt_error_string(-1) << ")";
m_registeredWindowClassNames.insert(className);
qCDebug(lcQpaWindowClass).nospace() << __FUNCTION__ << ' ' << className << ' ' << description << " atom=" << atom;
return className;
}
QString QWindowsWindowClassRegistry::registerWindowClass(const QWindow *window)
{
return registerWindowClass(QWindowsWindowClassDescription::fromWindow(window, m_defaultProcedure));
}
QString QWindowsWindowClassRegistry::registerWindowClass(QString name, WNDPROC procedure)
{
return registerWindowClass(QWindowsWindowClassDescription::fromName(name, procedure));
}
bool QWindowsWindowClassRegistry::shouldDecorateWindowClassName(const QWindowsWindowClassDescription &description) const
{
return shouldDecorateWindowClassName(description.name, description.procedure);
}
bool QWindowsWindowClassRegistry::shouldDecorateWindowClassName(const QString &name, WNDPROC procedure) const
{
const auto appInstance = static_cast<HINSTANCE>(GetModuleHandle(nullptr));
WNDCLASS wc{};
return GetClassInfo(appInstance, reinterpret_cast<LPCWSTR>(name.utf16()), &wc) != FALSE
&& wc.lpfnWndProc != procedure;
}
void QWindowsWindowClassRegistry::unregisterWindowClasses()
{
const auto appInstance = static_cast<HINSTANCE>(GetModuleHandle(nullptr));
for (const QString &name : std::as_const(m_registeredWindowClassNames)) {
if (!UnregisterClass(reinterpret_cast<LPCWSTR>(name.utf16()), appInstance) && QWindowsContext::verbose)
qCWarning(lcQpaWindowClass) << "Failed to unregister window class" << name
<< "(" << qt_error_string(-1) << ")";
}
m_registeredWindowClassNames.clear();
}
QT_END_NAMESPACE
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