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// Copyright (C) 2023 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 "qwincapturablewindows_p.h"
#include "private/qcapturablewindow_p.h"
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
static bool isTopLevelWindow(HWND hwnd)
{
return hwnd && ::GetAncestor(hwnd, GA_ROOT) == hwnd;
}
static bool canCaptureWindow(HWND hwnd)
{
Q_ASSERT(hwnd);
if (!::IsWindowVisible(hwnd))
return false;
RECT rect{};
if (!::GetWindowRect(hwnd, &rect))
return false;
if (rect.left >= rect.right || rect.top >= rect.bottom)
return false;
return true;
}
static QString windowTitle(HWND hwnd) {
// QTBUG-114890
// TODO: investigate the case when hwnd is inner and belows to another thread.
// It might causes deadlocks in specific cases.
auto titleLength = ::GetWindowTextLengthW(hwnd);
std::wstring buffer(titleLength + 1, L'\0');
titleLength = ::GetWindowTextW(hwnd, buffer.data(), titleLength + 1);
buffer.resize(titleLength);
return QString::fromStdWString(buffer);
}
QList<QCapturableWindow> QWinCapturableWindows::windows() const
{
QList<QCapturableWindow> result;
auto windowHandler = [](HWND hwnd, LPARAM lParam) {
if (!canCaptureWindow(hwnd))
return TRUE; // Ignore window and continue enumerating
auto& windows = *reinterpret_cast<QList<QCapturableWindow>*>(lParam);
auto windowData = std::make_unique<QCapturableWindowPrivate>();
windowData->id = reinterpret_cast<QCapturableWindowPrivate::Id>(hwnd);
windowData->description = windowTitle(hwnd);
windows.push_back(windowData.release()->create());
return TRUE;
};
::EnumWindows(windowHandler, reinterpret_cast<LPARAM>(&result));
return result;
}
bool QWinCapturableWindows::isWindowValid(const QCapturableWindowPrivate &window) const
{
const auto hwnd = reinterpret_cast<HWND>(window.id);
return isTopLevelWindow(hwnd) && canCaptureWindow(hwnd);
}
QT_END_NAMESPACE
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