gestures.h - mozsearch

Enable keyboard shortcuts

// Copyright (C) 2026 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef GESTURES_H

#define GESTURES_H

#include <QGesture>

#include <QList>

#include <QPainter>

#include <QPainterPath>

#include <QPointF>

#include <QSharedPointer>

class QWidget;

// Draws an outline of an ellipse at center with the given diameters and color.

static inline void drawEllipse(const QPointF &center, qreal hDiameter, qreal vDiameter,

                               const QColor &color, QPainter &painter)

    const QPen oldPen = painter.pen();

    QPen pen = oldPen;

    pen.setColor(color);

    painter.setPen(pen);

    painter.drawEllipse(center, hDiameter / 2, vDiameter / 2);

    painter.setPen(oldPen);

// Fills an ellipse at center with the given diameters and color.

static inline void fillEllipse(const QPointF &center, qreal hDiameter, qreal vDiameter,

                               const QColor &color, QPainter &painter)

    QPainterPath painterPath;

    painterPath.addEllipse(center, hDiameter / 2, vDiameter / 2);

    painter.fillPath(painterPath, color);

// Hierarchy of classes containing gesture parameters and drawing functionality.

class Gesture {

    Q_DISABLE_COPY(Gesture)

public:

    static Gesture *fromQGesture(const QWidget *w, const QGesture *source);

    virtual ~Gesture() {}

    virtual void draw(const QRectF &rect, QPainter &painter) const = 0;

protected:

    explicit Gesture(const QWidget *w, const QGesture *source);

    QPointF drawHotSpot(const QRectF &rect, QPainter &painter) const;

private:

    Qt::GestureType m_type;

    QPointF m_hotSpot;

    bool m_hasHotSpot;

};

class PanGesture : public Gesture {

public:

    explicit PanGesture(const QWidget *w, const QPanGesture *source);

    void draw(const QRectF &rect, QPainter &painter) const override;

private:

    QPointF m_offset;

};

class SwipeGesture : public Gesture {

public:

    explicit SwipeGesture(const QWidget *w, const QSwipeGesture *source);

    void draw(const QRectF &rect, QPainter &painter) const override;

private:

    QSwipeGesture::SwipeDirection m_horizontal;

    QSwipeGesture::SwipeDirection m_vertical;

    qreal m_angle;

};

typedef QSharedPointer<Gesture> GesturePtr;

typedef QList<GesturePtr> GesturePtrs;

#endif // GESTURES_H