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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 proc)
: m_proc(proc)
{
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.
const auto appInstance = static_cast<HINSTANCE>(GetModuleHandle(nullptr));
WNDCLASS wcinfo;
const bool classExists = GetClassInfo(appInstance, reinterpret_cast<LPCWSTR>(className.utf16()), &wcinfo) != FALSE
&& wcinfo.lpfnWndProc != description.procedure;
if (classExists)
className += QUuid::createUuid().toString();
if (m_registeredWindowClassNames.contains(className)) // already registered in our list
return className;
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = description.style;
wc.lpfnWndProc = description.procedure;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = appInstance;
wc.hCursor = nullptr;
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.hIconSm = nullptr;
}
}
else {
wc.hIcon = nullptr;
wc.hIconSm = nullptr;
}
wc.lpszMenuName = nullptr;
wc.lpszClassName = reinterpret_cast<LPCWSTR>(className.utf16());
ATOM atom = RegisterClassEx(&wc);
if (!atom)
qErrnoWarning("QApplication::regClass: Registering window class '%s' failed.",
qPrintable(className));
m_registeredWindowClassNames.insert(className);
qCDebug(lcQpaWindowClass).nospace() << __FUNCTION__ << ' ' << className
<< " style=0x" << Qt::hex << description.style << Qt::dec
<< " brush=" << description.brush << " icon=" << description.hasIcon << " atom=" << atom;
return className;
}
QString QWindowsWindowClassRegistry::registerWindowClass(const QWindow *window)
{
return registerWindowClass(QWindowsWindowClassDescription::fromWindow(window, m_proc));
}
QString QWindowsWindowClassRegistry::registerWindowClass(QString name, WNDPROC procedure)
{
return registerWindowClass(QWindowsWindowClassDescription::fromName(name, 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)
qErrnoWarning("UnregisterClass failed for '%s'", qPrintable(name));
}
m_registeredWindowClassNames.clear();
}
QT_END_NAMESPACE
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