// Copyright (C) 2023-2024 Stdware Collections (https://www.github.com/stdware)
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// Copyright (C) 2021-2023 wangwenx190 (Yuhang Zhao)
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// SPDX-License-Identifier: Apache-2.0
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#ifndef SYSTEMWINDOW_P_H
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#define SYSTEMWINDOW_P_H
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//
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// W A R N I N G !!!
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// -----------------
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//
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// This file is not part of the QWindowKit API. It is used purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or may even be removed.
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//
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#include <QtGui/QWindow>
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#include <QtGui/QMouseEvent>
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#include <QWKCore/private/qwkglobal_p.h>
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namespace QWK {
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class WindowMoveManipulator : public QObject {
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public:
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explicit WindowMoveManipulator(QWindow *targetWindow)
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: QObject(targetWindow), target(targetWindow), initialMousePosition(QCursor::pos()),
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initialWindowPosition(targetWindow->position()) {
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target->installEventFilter(this);
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}
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protected:
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bool eventFilter(QObject *obj, QEvent *event) override {
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switch (event->type()) {
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case QEvent::MouseMove: {
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auto mouseEvent = static_cast<QMouseEvent *>(event);
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QPoint delta = getMouseEventGlobalPos(mouseEvent) - initialMousePosition;
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target->setPosition(initialWindowPosition + delta);
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return true;
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}
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case QEvent::MouseButtonRelease: {
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if (target->y() < 0) {
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target->setPosition(target->x(), 0);
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}
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target->removeEventFilter(this);
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deleteLater();
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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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private:
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QWindow *target;
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QPoint initialMousePosition;
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QPoint initialWindowPosition;
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};
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class WindowResizeManipulator : public QObject {
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public:
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WindowResizeManipulator(QWindow *targetWindow, Qt::Edges edges)
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: QObject(targetWindow), target(targetWindow), resizeEdges(edges),
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initialMousePosition(QCursor::pos()), initialWindowRect(target->geometry()) {
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target->installEventFilter(this);
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}
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protected:
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bool eventFilter(QObject *obj, QEvent *event) override {
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switch (event->type()) {
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case QEvent::MouseMove: {
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auto mouseEvent = static_cast<QMouseEvent *>(event);
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QPoint globalMousePos = getMouseEventGlobalPos(mouseEvent);
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QRect windowRect = initialWindowRect;
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if (resizeEdges & Qt::LeftEdge) {
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int delta = globalMousePos.x() - initialMousePosition.x();
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windowRect.setLeft(initialWindowRect.left() + delta);
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}
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if (resizeEdges & Qt::RightEdge) {
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int delta = globalMousePos.x() - initialMousePosition.x();
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windowRect.setRight(initialWindowRect.right() + delta);
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}
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if (resizeEdges & Qt::TopEdge) {
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int delta = globalMousePos.y() - initialMousePosition.y();
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windowRect.setTop(initialWindowRect.top() + delta);
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}
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if (resizeEdges & Qt::BottomEdge) {
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int delta = globalMousePos.y() - initialMousePosition.y();
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windowRect.setBottom(initialWindowRect.bottom() + delta);
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}
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target->setGeometry(windowRect);
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return true;
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}
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case QEvent::MouseButtonRelease: {
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target->removeEventFilter(this);
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deleteLater();
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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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private:
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QWindow *target;
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QPoint initialMousePosition;
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QRect initialWindowRect;
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Qt::Edges resizeEdges;
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};
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// QWindow::startSystemMove() and QWindow::startSystemResize() is first supported at Qt 5.15
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// QWindow::startSystemResize() returns false on macOS
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// QWindow::startSystemMove() and QWindow::startSystemResize() returns false on Linux Unity DE
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// When the new API fails, we emulate the window actions using the classical API.
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inline void startSystemMove(QWindow *window) {
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#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
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std::ignore = new WindowMoveManipulator(window);
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#elif defined(Q_OS_LINUX)
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if (window->startSystemMove()) {
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return;
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}
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std::ignore = new WindowMoveManipulator(window);
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#else
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window->startSystemMove();
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#endif
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}
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inline void startSystemResize(QWindow *window, Qt::Edges edges) {
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#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
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std::ignore = new WindowResizeManipulator(window, edges);
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#elif defined(Q_OS_MAC) || defined(Q_OS_LINUX)
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if (window->startSystemResize(edges)) {
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return;
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}
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std::ignore = new WindowResizeManipulator(window, edges);
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#else
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window->startSystemResize(edges);
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#endif
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}
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}
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#endif // SYSTEMWINDOW_P_H
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