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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef QWASMWINDOWSTACK_H
#define QWASMWINDOWSTACK_H
#include <qglobal.h>
#include <QtCore/qlist.h>
#include <vector>
QT_BEGIN_NAMESPACE
class QWasmWindow;
// Maintains a z-order hierarchy for a set of windows. The first added window is always treated as
// the 'root', which always stays at the bottom. Other windows are 'regular', which means they are
// subject to z-order changes via |raise| and |lower|/
// If the root is ever removed, all of the current and future windows in the stack are treated as
// regular.
// Access to the top element is facilitated by |topWindow|.
// Changes to the top element are signaled via the |topWindowChangedCallback| supplied at
// construction.
class Q_AUTOTEST_EXPORT QWasmWindowStack
{
public:
using WindowOrderChangedCallbackType = std::function<void()>;
using StorageType = QList<QWasmWindow *>;
using iterator = StorageType::reverse_iterator;
using const_iterator = StorageType::const_reverse_iterator;
using const_reverse_iterator = StorageType::const_iterator;
enum class PositionPreference {
StayOnBottom,
Regular,
StayOnTop,
};
explicit QWasmWindowStack(WindowOrderChangedCallbackType topWindowChangedCallback);
~QWasmWindowStack();
void pushWindow(QWasmWindow *window, PositionPreference position);
void removeWindow(QWasmWindow *window);
void raise(QWasmWindow *window);
void lower(QWasmWindow *window);
void windowPositionPreferenceChanged(QWasmWindow *window, PositionPreference position);
// Iterates top-to-bottom
iterator begin();
iterator end();
const_iterator begin() const;
const_iterator end() const;
// Iterates bottom-to-top
const_reverse_iterator rbegin() const;
const_reverse_iterator rend() const;
bool empty() const;
size_t size() const;
QWasmWindow *topWindow() const;
private:
PositionPreference getWindowPositionPreference(StorageType::iterator windowIt) const;
WindowOrderChangedCallbackType m_windowOrderChangedCallback;
QList<QWasmWindow *> m_windowStack;
StorageType::iterator m_regularWindowsBegin;
StorageType::iterator m_alwaysOnTopWindowsBegin;
};
QT_END_NAMESPACE
#endif // QWASMWINDOWSTACK_H
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