// Copyright (C) 2016 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

#ifndef QWINDOWSYSTEMINTERFACE_P_H

#define QWINDOWSYSTEMINTERFACE_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtGui/private/qevent_p.h>

#include <QtGui/private/qtguiglobal_p.h>

#include "qwindowsysteminterface.h"

#include <QElapsedTimer>

#include <QPointer>

#include <QMutex>

#include <QList>

#include <QWaitCondition>

#include <QAtomicInt>

#include <QLoggingCategory>

QT_BEGIN_NAMESPACE

QT_DECLARE_EXPORTED_QT_LOGGING_CATEGORY(lcQpaInputDevices, Q_GUI_EXPORT)

class QWindowSystemEventHandler;

class Q_GUI_EXPORT QWindowSystemInterfacePrivate {

public:

    enum EventType {

        UserInputEvent = 0x100,

        Close = UserInputEvent | 0x01,

        GeometryChange = 0x02,

        Enter = UserInputEvent | 0x03,

        Leave = UserInputEvent | 0x04,

        FocusWindow = 0x05,

        WindowStateChanged = 0x06,

        Mouse = UserInputEvent | 0x07,

        Wheel = UserInputEvent | 0x09,

        Key = UserInputEvent | 0x0a,

        Touch = UserInputEvent | 0x0b,

        ScreenOrientation = 0x0c,

        ScreenGeometry = 0x0d,

        ScreenAvailableGeometry = 0x0e,

        ScreenLogicalDotsPerInch = 0x0f,

        ScreenRefreshRate = 0x10,

        ThemeChange = 0x11,

        Expose = 0x12,

        FileOpen = UserInputEvent | 0x13,

        Tablet = UserInputEvent | 0x14,

        TabletEnterProximity = UserInputEvent | 0x15,

        TabletLeaveProximity = UserInputEvent | 0x16,

        PlatformPanel = UserInputEvent | 0x17,

        ContextMenu = UserInputEvent | 0x18,

        EnterWhatsThisMode = UserInputEvent | 0x19,

#ifndef QT_NO_GESTURES

        Gesture = UserInputEvent | 0x1a,

#endif

        ApplicationStateChanged = 0x19,

        FlushEvents = 0x20,

        WindowScreenChanged = 0x21,

        SafeAreaMarginsChanged = 0x22,

        ApplicationTermination = 0x23,

        Paint = 0x24,

        WindowDevicePixelRatioChanged = 0x25,

    };

    class WindowSystemEvent {

    public:

        enum {

            Synthetic = 0x1,

            NullWindow = 0x2

        };

        explicit WindowSystemEvent(EventType t)

            : type(t), flags(0), eventAccepted(true) { }

        virtual ~WindowSystemEvent() { }

        bool synthetic() const  { return flags & Synthetic; }

        bool nullWindow() const { return flags & NullWindow; }

        EventType type;

        int flags;

        bool eventAccepted;

    };

    class CloseEvent : public WindowSystemEvent {

    public:

        explicit CloseEvent(QWindow *w)

            : WindowSystemEvent(Close), window(w)

            { }

        QPointer<QWindow> window;

    };

    class GeometryChangeEvent : public WindowSystemEvent {

    public:

        GeometryChangeEvent(QWindow *window, QRect requestedGeometry, QRect newGeometry);

        QPointer<QWindow> window;

        QRect requestedGeometry;

        QRect newGeometry;

    };

    class EnterEvent : public WindowSystemEvent {

    public:

        explicit EnterEvent(QWindow *enter, const QPointF &local, const QPointF &global)

            : WindowSystemEvent(Enter), enter(enter), localPos(local), globalPos(global)

        { }

        QPointer<QWindow> enter;

        const QPointF localPos;

        const QPointF globalPos;

    };

    class LeaveEvent : public WindowSystemEvent {

    public:

        explicit LeaveEvent(QWindow *leave)

            : WindowSystemEvent(Leave), leave(leave)

        { }

        QPointer<QWindow> leave;

    };

    class FocusWindowEvent : public WindowSystemEvent {

    public:

        explicit FocusWindowEvent(QWindow *focusedWindow, Qt::FocusReason r)

            : WindowSystemEvent(FocusWindow), focused(focusedWindow), reason(r)

        { }

        QPointer<QWindow> focused;

        Qt::FocusReason reason;

    };

    class WindowStateChangedEvent : public WindowSystemEvent {

    public:

        WindowStateChangedEvent(QWindow *_window, Qt::WindowStates _newState, Qt::WindowStates _oldState)

            : WindowSystemEvent(WindowStateChanged), window(_window), newState(_newState), oldState(_oldState)

        { }

        QPointer<QWindow> window;

        Qt::WindowStates newState;

        Qt::WindowStates oldState;

    };

    class WindowScreenChangedEvent : public WindowSystemEvent {

    public:

        WindowScreenChangedEvent(QWindow *w, QScreen *s)

            : WindowSystemEvent(WindowScreenChanged), window(w), screen(s)

        { }

        QPointer<QWindow> window;

        QPointer<QScreen> screen;

    };

    class WindowDevicePixelRatioChangedEvent : public WindowSystemEvent {

    public:

        WindowDevicePixelRatioChangedEvent(QWindow *w)

            : WindowSystemEvent(WindowDevicePixelRatioChanged), window(w)

        { }

        QPointer<QWindow> window;

    };

    class SafeAreaMarginsChangedEvent : public WindowSystemEvent {

    public:

        SafeAreaMarginsChangedEvent(QWindow *w)

            : WindowSystemEvent(SafeAreaMarginsChanged), window(w)

        { }

        QPointer<QWindow> window;

    };

    class ApplicationStateChangedEvent : public WindowSystemEvent {

    public:

        ApplicationStateChangedEvent(Qt::ApplicationState newState, bool forcePropagate = false)

            : WindowSystemEvent(ApplicationStateChanged), newState(newState), forcePropagate(forcePropagate)

        { }

        Qt::ApplicationState newState;

        bool forcePropagate;

    };

    class FlushEventsEvent : public WindowSystemEvent {

    public:

        FlushEventsEvent(QEventLoop::ProcessEventsFlags f = QEventLoop::AllEvents)

            : WindowSystemEvent(FlushEvents)

            , flags(f)

        { }

        QEventLoop::ProcessEventsFlags flags;

    };

    class UserEvent : public WindowSystemEvent {

    public:

        UserEvent(QWindow * w, ulong time, EventType t)

            : WindowSystemEvent(t), window(w), timestamp(time)

        {

            if (!w)

                flags |= NullWindow;

        }

        QPointer<QWindow> window;

        unsigned long timestamp;

    };

    class InputEvent: public UserEvent {

    public:

        InputEvent(QWindow *w, ulong time, EventType t, Qt::KeyboardModifiers mods, const QInputDevice *dev)

            : UserEvent(w, time, t), modifiers(mods), device(dev) {}

        Qt::KeyboardModifiers modifiers;

        const QInputDevice *device;

    };

    class PointerEvent : public InputEvent {

    public:

        PointerEvent(QWindow * w, ulong time, EventType t, Qt::KeyboardModifiers mods, const QPointingDevice *device)

            : InputEvent(w, time, t, mods, device) {}

    };

    class MouseEvent : public PointerEvent {

    public:

        MouseEvent(QWindow *w, ulong time, const QPointF &local, const QPointF &global,

                   Qt::MouseButtons state, Qt::KeyboardModifiers mods,

                   Qt::MouseButton b, QEvent::Type type,

                   Qt::MouseEventSource src = Qt::MouseEventNotSynthesized, bool frame = false,

                   const QPointingDevice *device = QPointingDevice::primaryPointingDevice(),

                   int evPtId = -1)

            : PointerEvent(w, time, Mouse, mods, device), localPos(local), globalPos(global),

              buttons(state), source(src), nonClientArea(frame), button(b), buttonType(type),

              eventPointId(evPtId) { }

        QPointF localPos;

        QPointF globalPos;

        Qt::MouseButtons buttons;

        Qt::MouseEventSource source;

        bool nonClientArea;

        Qt::MouseButton button;

        QEvent::Type buttonType;

        int eventPointId; // from the original device if synth-mouse, otherwise -1

    };

    class WheelEvent : public PointerEvent {

    public:

        WheelEvent(QWindow *w, ulong time, const QPointF &local, const QPointF &global, QPoint pixelD, QPoint angleD, int qt4D, Qt::Orientation qt4O,

                   Qt::KeyboardModifiers mods, Qt::ScrollPhase phase = Qt::NoScrollPhase, Qt::MouseEventSource src = Qt::MouseEventNotSynthesized,

                   bool inverted = false, const QPointingDevice *device = QPointingDevice::primaryPointingDevice())

            : PointerEvent(w, time, Wheel, mods, device), pixelDelta(pixelD), angleDelta(angleD), qt4Delta(qt4D),

              qt4Orientation(qt4O), localPos(local), globalPos(global), phase(phase), source(src), inverted(inverted) { }

        QPoint pixelDelta;

        QPoint angleDelta;

        int qt4Delta;

        Qt::Orientation qt4Orientation;

        QPointF localPos;

        QPointF globalPos;

        Qt::ScrollPhase phase;

        Qt::MouseEventSource source;

        bool inverted;

    };

    class KeyEvent : public InputEvent {

    public:

        KeyEvent(QWindow *w, ulong time, QEvent::Type t, int k, Qt::KeyboardModifiers mods,

                 const QString & text = QString(), bool autorep = false, ushort count = 1,

                 const QInputDevice *device = QInputDevice::primaryKeyboard())

            : InputEvent(w, time, Key, mods, device), source(nullptr), key(k), unicode(text),

             repeat(autorep), repeatCount(count), keyType(t),

             nativeScanCode(0), nativeVirtualKey(0), nativeModifiers(0) { }

        KeyEvent(QWindow *w, ulong time, QEvent::Type t, int k, Qt::KeyboardModifiers mods,

                 quint32 nativeSC, quint32 nativeVK, quint32 nativeMods,

                 const QString & text = QString(), bool autorep = false, ushort count = 1,

                 const QInputDevice *device = QInputDevice::primaryKeyboard())

            : InputEvent(w, time, Key, mods, device), source(nullptr), key(k), unicode(text),

             repeat(autorep), repeatCount(count), keyType(t),

             nativeScanCode(nativeSC), nativeVirtualKey(nativeVK), nativeModifiers(nativeMods) { }

        const QInputDevice *source;

        int key;

        QString unicode;

        bool repeat;

        ushort repeatCount;

        QEvent::Type keyType;

        quint32 nativeScanCode;

        quint32 nativeVirtualKey;

        quint32 nativeModifiers;

    };

    class TouchEvent : public PointerEvent {

    public:

        TouchEvent(QWindow *w, ulong time, QEvent::Type t, const QPointingDevice *device,

                   const QList<QEventPoint> &p, Qt::KeyboardModifiers mods)

            : PointerEvent(w, time, Touch, mods, device), points(p), touchType(t) { }

        QList<QEventPoint> points;

        QEvent::Type touchType;

    };

    class ScreenOrientationEvent : public WindowSystemEvent {

    public:

        ScreenOrientationEvent(QScreen *s, Qt::ScreenOrientation o)

            : WindowSystemEvent(ScreenOrientation), screen(s), orientation(o) { }

        QPointer<QScreen> screen;

        Qt::ScreenOrientation orientation;

    };

    class ScreenGeometryEvent : public WindowSystemEvent {

    public:

        ScreenGeometryEvent(QScreen *s, const QRect &g, const QRect &ag)

            : WindowSystemEvent(ScreenGeometry), screen(s), geometry(g), availableGeometry(ag) { }

        QPointer<QScreen> screen;

        QRect geometry;

        QRect availableGeometry;

    };

    class ScreenLogicalDotsPerInchEvent : public WindowSystemEvent {

    public:

        ScreenLogicalDotsPerInchEvent(QScreen *s, qreal dx, qreal dy)

            : WindowSystemEvent(ScreenLogicalDotsPerInch), screen(s), dpiX(dx), dpiY(dy) { }

        QPointer<QScreen> screen;

        qreal dpiX;

        qreal dpiY;

    };

    class ScreenRefreshRateEvent : public WindowSystemEvent {

    public:

        ScreenRefreshRateEvent(QScreen *s, qreal r)

            : WindowSystemEvent(ScreenRefreshRate), screen(s), rate(r) { }

        QPointer<QScreen> screen;

        qreal rate;

    };

    class ThemeChangeEvent : public WindowSystemEvent {

    public:

        explicit ThemeChangeEvent()

            : WindowSystemEvent(ThemeChange) { }

    };

    class ExposeEvent : public WindowSystemEvent {

    public:

        ExposeEvent(QWindow *window, const QRegion &region);

        QPointer<QWindow> window;

        bool isExposed;

        QRegion region;

    };

    class PaintEvent : public WindowSystemEvent {

    public:

        PaintEvent(QWindow *window, const QRegion &region)

            :  WindowSystemEvent(Paint), window(window), region(region) {}

        QPointer<QWindow> window;

        QRegion region;

    };

    class FileOpenEvent : public WindowSystemEvent {

    public:

        FileOpenEvent(const QString& fileName)

            : WindowSystemEvent(FileOpen), url(QUrl::fromLocalFile(fileName))

        { }

        FileOpenEvent(const QUrl &url)

            : WindowSystemEvent(FileOpen), url(url)

        { }

        QUrl url;

    };

    class Q_GUI_EXPORT TabletEvent : public PointerEvent {

    public:

        // TODO take QPointingDevice* instead of types and IDs

        static void handleTabletEvent(QWindow *w, const QPointF &local, const QPointF &global,

                                      int device, int pointerType, Qt::MouseButtons buttons, qreal pressure, qreal xTilt, qreal yTilt,

                                      qreal tangentialPressure, qreal rotation, int z, qint64 uid,

                                      Qt::KeyboardModifiers modifiers = Qt::NoModifier);

        static void setPlatformSynthesizesMouse(bool v);

        TabletEvent(QWindow *w, ulong time, const QPointF &local, const QPointF &global,

                    const QPointingDevice *device, Qt::MouseButtons b, qreal pressure, qreal xTilt, qreal yTilt, qreal tpressure,

                    qreal rotation, int z, Qt::KeyboardModifiers mods)

            : PointerEvent(w, time, Tablet, mods, device),

              buttons(b), local(local), global(global),

              pressure(pressure), xTilt(xTilt), yTilt(yTilt), tangentialPressure(tpressure),

              rotation(rotation), z(z) { }

        Qt::MouseButtons buttons;

        QPointF local;

        QPointF global;

        qreal pressure;

        qreal xTilt;

        qreal yTilt;

        qreal tangentialPressure;

        qreal rotation;

        int z;

        static bool platformSynthesizesMouse;

    };

    class TabletEnterProximityEvent : public PointerEvent {

    public:

        // TODO store more info: position and whatever else we can get on most platforms

        TabletEnterProximityEvent(ulong time, const QPointingDevice *device)

            : PointerEvent(nullptr, time, TabletEnterProximity, Qt::NoModifier, device) { }

    };

    class TabletLeaveProximityEvent : public PointerEvent {

    public:

        // TODO store more info: position and whatever else we can get on most platforms

        TabletLeaveProximityEvent(ulong time, const QPointingDevice *device)

            : PointerEvent(nullptr, time, TabletLeaveProximity, Qt::NoModifier, device) { }

    };

    class PlatformPanelEvent : public WindowSystemEvent {

    public:

        explicit PlatformPanelEvent(QWindow *w)

            : WindowSystemEvent(PlatformPanel), window(w) { }

        QPointer<QWindow> window;

    };

#ifndef QT_NO_CONTEXTMENU

    class ContextMenuEvent : public WindowSystemEvent {

    public:

        explicit ContextMenuEvent(QWindow *w, bool mouseTriggered, const QPoint &pos,

                                  const QPoint &globalPos, Qt::KeyboardModifiers modifiers)

            : WindowSystemEvent(ContextMenu), window(w), mouseTriggered(mouseTriggered), pos(pos),

              globalPos(globalPos), modifiers(modifiers) { }

        QPointer<QWindow> window;

        bool mouseTriggered;

        QPoint pos;       // Only valid if triggered by mouse

        QPoint globalPos; // Only valid if triggered by mouse

        Qt::KeyboardModifiers modifiers;

    };

#endif

#ifndef QT_NO_GESTURES

    class GestureEvent : public PointerEvent {

    public:

        GestureEvent(QWindow *window, ulong time, Qt::NativeGestureType type, const QPointingDevice *dev,

                     int fingerCount, QPointF pos, QPointF globalPos, qreal realValue, QPointF delta)

            : PointerEvent(window, time, Gesture, Qt::NoModifier, dev), type(type), pos(pos), globalPos(globalPos),

              delta(delta), fingerCount(fingerCount), realValue(realValue), sequenceId(0), intValue(0) { }

        Qt::NativeGestureType type;

        QPointF pos;

        QPointF globalPos;

        QPointF delta;

        int fingerCount;

        // Mac

        qreal realValue;

        // Windows

        ulong sequenceId;

        quint64 intValue;

    };

#endif

    class WindowSystemEventList {

        QList<WindowSystemEvent *> impl;

        mutable QMutex mutex;

    public:

        WindowSystemEventList() : impl(), mutex() {}

        ~WindowSystemEventList() { clear(); }

        void clear()

        { const QMutexLocker locker(&mutex); qDeleteAll(impl); impl.clear(); }

        void prepend(WindowSystemEvent *e)

        { const QMutexLocker locker(&mutex); impl.prepend(e); }

        WindowSystemEvent *takeFirstOrReturnNull()

        { const QMutexLocker locker(&mutex); return impl.empty() ? nullptr : impl.takeFirst(); }

        WindowSystemEvent *takeFirstNonUserInputOrReturnNull()

        {

            const QMutexLocker locker(&mutex);

            for (int i = 0; i < impl.size(); ++i)

                if (!(impl.at(i)->type & QWindowSystemInterfacePrivate::UserInputEvent))

                    return impl.takeAt(i);

            return nullptr;

        }

        bool nonUserInputEventsQueued()

        {

            const QMutexLocker locker(&mutex);

            for (int i = 0; i < impl.size(); ++i)

                if (!(impl.at(i)->type & QWindowSystemInterfacePrivate::UserInputEvent))

                    return true;

            return false;

        }

        void append(WindowSystemEvent *e)

        { const QMutexLocker locker(&mutex); impl.append(e); }

        qsizetype count() const

        { const QMutexLocker locker(&mutex); return impl.size(); }

        WindowSystemEvent *peekAtFirstOfType(EventType t) const

        {

            const QMutexLocker locker(&mutex);

            for (int i = 0; i < impl.size(); ++i) {

                if (impl.at(i)->type == t)

                    return impl.at(i);

            }

            return nullptr;

        }

        void remove(const WindowSystemEvent *e)

        {

            const QMutexLocker locker(&mutex);

            for (int i = 0; i < impl.size(); ++i) {

                if (impl.at(i) == e) {

                    delete impl.takeAt(i);

                    break;

                }

            }

        }

    private:

        Q_DISABLE_COPY_MOVE(WindowSystemEventList)

    };

    static WindowSystemEventList windowSystemEventQueue;

    static qsizetype windowSystemEventsQueued();

    static bool nonUserInputEventsQueued();

    static WindowSystemEvent *getWindowSystemEvent();

    static WindowSystemEvent *getNonUserInputWindowSystemEvent();

    static WindowSystemEvent *peekWindowSystemEvent(EventType t);

    static void removeWindowSystemEvent(WindowSystemEvent *event);

public:

    static QElapsedTimer eventTime;

    static bool synchronousWindowSystemEvents;

    static bool platformFiltersEvents;

    static QWaitCondition eventsFlushed;

    static QMutex flushEventMutex;

    static QAtomicInt eventAccepted;

    static QList<QEventPoint>

        fromNativeTouchPoints(const QList<QWindowSystemInterface::TouchPoint> &points,

                              const QWindow *window, QEvent::Type *type = nullptr);

    template<class EventPointList>

    static QList<QWindowSystemInterface::TouchPoint>

        toNativeTouchPoints(const EventPointList &pointList, const QWindow *window)

    {

        QList<QWindowSystemInterface::TouchPoint> newList;

        newList.reserve(pointList.size());

        for (const auto &point : pointList) {

            newList.append(toNativeTouchPoint(point, window));

        }

        return newList;

    }

    static QWindowSystemInterface::TouchPoint

        toNativeTouchPoint(const QEventPoint &point, const QWindow *window);

    static void installWindowSystemEventHandler(QWindowSystemEventHandler *handler);

    static void removeWindowSystemEventhandler(QWindowSystemEventHandler *handler);

    static QWindowSystemEventHandler *eventHandler;

};

class Q_GUI_EXPORT QWindowSystemEventHandler

{

public:

    virtual ~QWindowSystemEventHandler();

    virtual bool sendEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *event);

};

QT_END_NAMESPACE

#endif // QWINDOWSYSTEMINTERFACE_P_H