// Copyright (C) 2023-2024 Stdware Collections
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// SPDX-License-Identifier: Apache-2.0
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#include "qtwindowcontext_p.h"
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#include <QtCore/QDebug>
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#include "qwkglobal_p.h"
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#include "systemwindow_p.h"
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namespace QWK {
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static constexpr const quint8 kDefaultResizeBorderThickness = 8;
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static Qt::CursorShape calculateCursorShape(const QWindow *window, const QPoint &pos) {
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#ifdef Q_OS_MACOS
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Q_UNUSED(window);
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Q_UNUSED(pos);
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return Qt::ArrowCursor;
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#else
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Q_ASSERT(window);
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if (!window) {
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return Qt::ArrowCursor;
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}
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if (window->visibility() != QWindow::Windowed) {
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return Qt::ArrowCursor;
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}
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const int x = pos.x();
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const int y = pos.y();
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const int w = window->width();
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const int h = window->height();
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if (((x < kDefaultResizeBorderThickness) && (y < kDefaultResizeBorderThickness)) ||
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((x >= (w - kDefaultResizeBorderThickness)) &&
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(y >= (h - kDefaultResizeBorderThickness)))) {
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return Qt::SizeFDiagCursor;
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}
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if (((x >= (w - kDefaultResizeBorderThickness)) && (y < kDefaultResizeBorderThickness)) ||
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((x < kDefaultResizeBorderThickness) && (y >= (h - kDefaultResizeBorderThickness)))) {
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return Qt::SizeBDiagCursor;
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}
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if ((x < kDefaultResizeBorderThickness) || (x >= (w - kDefaultResizeBorderThickness))) {
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return Qt::SizeHorCursor;
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}
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if ((y < kDefaultResizeBorderThickness) || (y >= (h - kDefaultResizeBorderThickness))) {
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return Qt::SizeVerCursor;
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}
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return Qt::ArrowCursor;
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#endif
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}
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static inline Qt::Edges calculateWindowEdges(const QWindow *window, const QPoint &pos) {
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#ifdef Q_OS_MACOS
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Q_UNUSED(window);
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Q_UNUSED(pos);
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return {};
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#else
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Q_ASSERT(window);
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if (!window) {
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return {};
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}
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if (window->visibility() != QWindow::Windowed) {
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return {};
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}
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Qt::Edges edges = {};
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const int x = pos.x();
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const int y = pos.y();
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if (x < kDefaultResizeBorderThickness) {
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edges |= Qt::LeftEdge;
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}
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if (x >= (window->width() - kDefaultResizeBorderThickness)) {
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edges |= Qt::RightEdge;
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}
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if (y < kDefaultResizeBorderThickness) {
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edges |= Qt::TopEdge;
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}
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if (y >= (window->height() - kDefaultResizeBorderThickness)) {
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edges |= Qt::BottomEdge;
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}
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return edges;
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#endif
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}
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class QtWindowEventFilter : public SharedEventFilter {
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public:
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explicit QtWindowEventFilter(AbstractWindowContext *context);
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~QtWindowEventFilter() override;
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enum WindowStatus {
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Idle,
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WaitingRelease,
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PreparingMove,
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Moving,
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Resizing,
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};
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protected:
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bool sharedEventFilter(QObject *object, QEvent *event) override;
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private:
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AbstractWindowContext *m_context;
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bool m_cursorShapeChanged;
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WindowStatus m_windowStatus;
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};
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QtWindowEventFilter::QtWindowEventFilter(AbstractWindowContext *context)
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: m_context(context), m_cursorShapeChanged(false), m_windowStatus(Idle) {
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m_context->installSharedEventFilter(this);
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}
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QtWindowEventFilter::~QtWindowEventFilter() = default;
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bool QtWindowEventFilter::sharedEventFilter(QObject *obj, QEvent *event) {
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Q_UNUSED(obj)
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auto type = event->type();
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if (type < QEvent::MouseButtonPress || type > QEvent::MouseMove) {
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return false;
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}
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auto host = m_context->host();
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auto window = m_context->window();
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auto delegate = m_context->delegate();
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auto me = static_cast<const QMouseEvent *>(event);
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bool fixedSize = delegate->isHostSizeFixed(host);
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QPoint scenePos = getMouseEventScenePos(me);
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QPoint globalPos = getMouseEventGlobalPos(me);
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bool inTitleBar = m_context->isInTitleBarDraggableArea(scenePos);
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switch (type) {
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case QEvent::MouseButtonPress: {
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switch (me->button()) {
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case Qt::LeftButton: {
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if (!fixedSize) {
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Qt::Edges edges = calculateWindowEdges(window, scenePos);
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if (edges != Qt::Edges()) {
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m_windowStatus = Resizing;
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startSystemResize(window, edges);
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event->accept();
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return true;
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}
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}
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if (inTitleBar) {
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// If we call startSystemMove() now but release the mouse without actual
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// movement, there will be no MouseReleaseEvent, so we defer it when the
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// mouse is actually moving for the first time
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m_windowStatus = PreparingMove;
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event->accept();
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return true;
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}
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break;
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}
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case Qt::RightButton: {
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m_context->showSystemMenu(globalPos);
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break;
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}
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default:
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break;
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}
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m_windowStatus = WaitingRelease;
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break;
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}
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case QEvent::MouseButtonRelease: {
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switch (m_windowStatus) {
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case PreparingMove:
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case Moving:
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case Resizing: {
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m_windowStatus = Idle;
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event->accept();
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return true;
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}
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case WaitingRelease: {
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m_windowStatus = Idle;
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break;
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}
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default: {
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if (inTitleBar) {
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event->accept();
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return true;
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}
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break;
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}
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}
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break;
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}
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case QEvent::MouseMove: {
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switch (m_windowStatus) {
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case Moving: {
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return true;
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}
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case PreparingMove: {
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m_windowStatus = Moving;
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startSystemMove(window);
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event->accept();
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return true;
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}
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case Idle: {
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if (!fixedSize) {
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const Qt::CursorShape shape = calculateCursorShape(window, scenePos);
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if (shape == Qt::ArrowCursor) {
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if (m_cursorShapeChanged) {
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delegate->restoreCursorShape(host);
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m_cursorShapeChanged = false;
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}
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} else {
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delegate->setCursorShape(host, shape);
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m_cursorShapeChanged = true;
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}
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}
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break;
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}
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default:
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break;
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}
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break;
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}
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case QEvent::MouseButtonDblClick: {
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if (me->button() == Qt::LeftButton && inTitleBar && !fixedSize) {
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Qt::WindowStates windowState = delegate->getWindowState(host);
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if (!(windowState & Qt::WindowFullScreen)) {
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if (windowState & Qt::WindowMaximized) {
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delegate->setWindowState(host, windowState & ~Qt::WindowMaximized);
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} else {
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delegate->setWindowState(host, windowState | Qt::WindowMaximized);
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}
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event->accept();
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return true;
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}
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}
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break;
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}
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default:
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break;
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}
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return false;
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}
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QtWindowContext::QtWindowContext() : AbstractWindowContext() {
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qtWindowEventFilter = std::make_unique<QtWindowEventFilter>(this);
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}
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QtWindowContext::~QtWindowContext() = default;
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QString QtWindowContext::key() const {
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return QStringLiteral("qt");
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}
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void QtWindowContext::virtual_hook(int id, void *data) {
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AbstractWindowContext::virtual_hook(id, data);
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}
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void QtWindowContext::winIdChanged() {
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if (!m_windowHandle) {
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m_delegate->setWindowFlags(m_host, m_delegate->getWindowFlags(m_host) &
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~Qt::FramelessWindowHint);
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return;
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}
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// Allocate new resources
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m_delegate->setWindowFlags(m_host,
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m_delegate->getWindowFlags(m_host) | Qt::FramelessWindowHint);
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}
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}
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