legendmoveresizehandler_p.h

Enable keyboard shortcuts

// Copyright (C) 2021 The Qt Company Ltd.

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

//  W A R N I N G

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

//

// This file is not part of the Qt Chart 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.

#ifndef LEGENDMOVERESIZEHANDLER_P_H

#define LEGENDMOVERESIZEHANDLER_P_H

#include <QtCharts/QChartGlobal>

#include <QtCore/QPointF>

#include <QtCharts/qlegend.h>

#include <QtCharts/private/qlegend_p.h>

#include <QtCharts/private/qchartglobal_p.h>

QT_BEGIN_NAMESPACE

class QGraphicsSceneMouseEvent;

class QGraphicsSceneHoverEvent;

class Q_CHARTS_EXPORT LegendMoveResizeHandler

public:

    LegendMoveResizeHandler(QLegend *legend);

    ~LegendMoveResizeHandler();

    inline bool shouldShowMoveHint() const { return m_mode == MousePosition::Top; }

    void reset();

    void handleMousePressEvent(QGraphicsSceneMouseEvent *event);

    void handleMouseMoveEvent(QGraphicsSceneMouseEvent *event);

    void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event);

    void handleHoverEnterEvent(QGraphicsSceneHoverEvent *event);

    void handleHoverMoveEvent(QGraphicsSceneHoverEvent *event);

    void handleHoverLeaveEvent(QGraphicsSceneHoverEvent *event);

private:

    enum class Action {

        Idle    = 0x00,

        Hovered = 0x01,

        Pressed = 0x02,

        Moving  = 0x04,

        Resizing= 0x08

};

    enum class MousePosition {

        Nowhere,

        TopLeft,

        BottomRight,

        BottomLeft,

        TopRight,

        Top,

        Bottom,

        Left,

        Right

};

    void setMouseCursor();

    void setMouseCursor(MousePosition mpos);

    void determineMousePosition(QPointF fromPoint);

    QLegend *m_legend{nullptr};

    QPointF m_moveOffset{0.0,0.0};

    Action m_action{Action::Idle};

    MousePosition m_mode{MousePosition::Nowhere};

    qreal m_reattachThreshold{0.0};

};

QT_END_NAMESPACE

#endif