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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmwindowstack.h"
QT_BEGIN_NAMESPACE
QWasmWindowStack::QWasmWindowStack(WindowOrderChangedCallbackType windowOrderChangedCallback)
: m_windowOrderChangedCallback(std::move(windowOrderChangedCallback)),
m_regularWindowsBegin(m_windowStack.begin()),
m_alwaysOnTopWindowsBegin(m_windowStack.begin())
{
}
QWasmWindowStack::~QWasmWindowStack() = default;
void QWasmWindowStack::pushWindow(QWasmWindow *window, PositionPreference position)
{
Q_ASSERT(m_windowStack.count(window) == 0);
if (position == PositionPreference::StayOnTop) {
const auto stayOnTopDistance =
std::distance(m_windowStack.begin(), m_alwaysOnTopWindowsBegin);
const auto regularDistance = std::distance(m_windowStack.begin(), m_regularWindowsBegin);
m_windowStack.push_back(window);
m_alwaysOnTopWindowsBegin = m_windowStack.begin() + stayOnTopDistance;
m_regularWindowsBegin = m_windowStack.begin() + regularDistance;
} else if (position == PositionPreference::Regular) {
const auto regularDistance = std::distance(m_windowStack.begin(), m_regularWindowsBegin);
m_alwaysOnTopWindowsBegin = m_windowStack.insert(m_alwaysOnTopWindowsBegin, window) + 1;
m_regularWindowsBegin = m_windowStack.begin() + regularDistance;
} else {
const auto stayOnTopDistance =
std::distance(m_windowStack.begin(), m_alwaysOnTopWindowsBegin);
m_regularWindowsBegin = m_windowStack.insert(m_regularWindowsBegin, window) + 1;
m_alwaysOnTopWindowsBegin = m_windowStack.begin() + stayOnTopDistance + 1;
}
m_windowOrderChangedCallback();
}
void QWasmWindowStack::removeWindow(QWasmWindow *window)
{
Q_ASSERT(m_windowStack.count(window) == 1);
auto it = std::find(m_windowStack.begin(), m_windowStack.end(), window);
const auto position = getWindowPositionPreference(it);
const auto stayOnTopDistance = std::distance(m_windowStack.begin(), m_alwaysOnTopWindowsBegin);
const auto regularDistance = std::distance(m_windowStack.begin(), m_regularWindowsBegin);
m_windowStack.erase(it);
m_alwaysOnTopWindowsBegin = m_windowStack.begin() + stayOnTopDistance
- (position != PositionPreference::StayOnTop ? 1 : 0);
m_regularWindowsBegin = m_windowStack.begin() + regularDistance
- (position == PositionPreference::StayOnBottom ? 1 : 0);
m_windowOrderChangedCallback();
}
void QWasmWindowStack::raise(QWasmWindow *window)
{
Q_ASSERT(m_windowStack.count(window) == 1);
if (window == topWindow())
return;
auto it = std::find(m_windowStack.begin(), m_windowStack.end(), window);
auto itEnd = ([this, position = getWindowPositionPreference(it)]() {
switch (position) {
case PositionPreference::StayOnTop:
return m_windowStack.end();
case PositionPreference::Regular:
return m_alwaysOnTopWindowsBegin;
case PositionPreference::StayOnBottom:
return m_regularWindowsBegin;
}
})();
std::rotate(it, it + 1, itEnd);
m_windowOrderChangedCallback();
}
void QWasmWindowStack::lower(QWasmWindow *window)
{
Q_ASSERT(m_windowStack.count(window) == 1);
if (window == *m_windowStack.begin())
return;
auto it = std::find(m_windowStack.begin(), m_windowStack.end(), window);
auto itBegin = ([this, position = getWindowPositionPreference(it)]() {
switch (position) {
case PositionPreference::StayOnTop:
return m_alwaysOnTopWindowsBegin;
case PositionPreference::Regular:
return m_regularWindowsBegin;
case PositionPreference::StayOnBottom:
return m_windowStack.begin();
}
})();
std::rotate(itBegin, it, it + 1);
m_windowOrderChangedCallback();
}
void QWasmWindowStack::windowPositionPreferenceChanged(QWasmWindow *window,
PositionPreference position)
{
auto it = std::find(m_windowStack.begin(), m_windowStack.end(), window);
const auto currentPosition = getWindowPositionPreference(it);
const auto zones = static_cast<int>(position) - static_cast<int>(currentPosition);
Q_ASSERT(zones != 0);
if (zones < 0) {
// Perform right rotation so that the window lands on top of regular windows
const auto begin = std::make_reverse_iterator(it + 1);
const auto end = position == PositionPreference::Regular
? std::make_reverse_iterator(m_alwaysOnTopWindowsBegin)
: std::make_reverse_iterator(m_regularWindowsBegin);
std::rotate(begin, begin + 1, end);
if (zones == -2) {
++m_alwaysOnTopWindowsBegin;
++m_regularWindowsBegin;
} else if (position == PositionPreference::Regular) {
++m_alwaysOnTopWindowsBegin;
} else {
++m_regularWindowsBegin;
}
} else {
// Perform left rotation so that the window lands at the bottom of always on top windows
const auto begin = it;
const auto end = position == PositionPreference::Regular ? m_regularWindowsBegin
: m_alwaysOnTopWindowsBegin;
std::rotate(begin, begin + 1, end);
if (zones == 2) {
--m_alwaysOnTopWindowsBegin;
--m_regularWindowsBegin;
} else if (position == PositionPreference::Regular) {
--m_regularWindowsBegin;
} else {
--m_alwaysOnTopWindowsBegin;
}
}
m_windowOrderChangedCallback();
}
QWasmWindowStack::iterator QWasmWindowStack::begin()
{
return m_windowStack.rbegin();
}
QWasmWindowStack::iterator QWasmWindowStack::end()
{
return m_windowStack.rend();
}
QWasmWindowStack::const_iterator QWasmWindowStack::begin() const
{
return m_windowStack.rbegin();
}
QWasmWindowStack::const_iterator QWasmWindowStack::end() const
{
return m_windowStack.rend();
}
QWasmWindowStack::const_reverse_iterator QWasmWindowStack::rbegin() const
{
return m_windowStack.begin();
}
QWasmWindowStack::const_reverse_iterator QWasmWindowStack::rend() const
{
return m_windowStack.end();
}
bool QWasmWindowStack::empty() const
{
return m_windowStack.empty();
}
size_t QWasmWindowStack::size() const
{
return m_windowStack.size();
}
QWasmWindow *QWasmWindowStack::topWindow() const
{
return m_windowStack.empty() ? nullptr : m_windowStack.last();
}
QWasmWindowStack::PositionPreference
QWasmWindowStack::getWindowPositionPreference(StorageType::iterator windowIt) const
{
if (windowIt >= m_alwaysOnTopWindowsBegin)
return PositionPreference::StayOnTop;
if (windowIt >= m_regularWindowsBegin)
return PositionPreference::Regular;
return PositionPreference::StayOnBottom;
}
QT_END_NAMESPACE
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