KisStopGradientSlider.h

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/*
 *  SPDX-FileCopyrightText: 2004 Cyrille Berger <cberger@cberger.net>
 *  SPDX-FileCopyrightText: 2016 Sven Langkamp <sven.langkamp@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef _KIS_STOP_GRADIENT_SLIDER_H_
#define _KIS_STOP_GRADIENT_SLIDER_H_
 
#include <QWidget>
 
#include <KoStopGradient.h>
#include <kis_signal_compressor.h>
 
class QEvent;
class QMouseEvent;
class QKeyEvent;
 
class KisStopGradientSlider : public QWidget
{
    Q_OBJECT
 
public:
    KisStopGradientSlider(QWidget *parent = 0, Qt::WindowFlags f = Qt::WindowFlags());
 
    int selectedStop();
 
    QSize sizeHint() const override;
    QSize minimumSizeHint() const override;
 
public Q_SLOTS:
    void setGradientResource(KoStopGradientSP gradient);
    void setSelectedStop(int selected);
    void selectPreviousStop();
    void selectNextStop();
    void deleteSelectedStop(bool selectNeighborStop = true);
    void chooseSelectedStopColor();
 
Q_SIGNALS:
    void sigSelectedStop(int stop);
    void updateRequested();
 
protected:
    void paintEvent(QPaintEvent *) override;
    void mousePressEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseDoubleClickEvent(QMouseEvent *e) override;
    void wheelEvent(QWheelEvent *e) override;
    void keyPressEvent(QKeyEvent *e) override;
    void leaveEvent(QEvent *e) override;
 
private Q_SLOTS:
    void updateHandleSize();
 
private:
    void insertStop(double t);
 
    QRect sliderRect() const;
    QRect gradientStripeRect() const;
    QRect handlesStripeRect() const;
    QRegion allowedClickRegion(int tolerance) const;
 
    void updateHoveredStop(const QPoint &pos);
    int handleClickTolerance() const;
    void handleIncrementInput(int direction, Qt::KeyboardModifiers modifiers);
    int minimalHeight() const;
 
private:
    static constexpr int removeStopDistance{32};
 
    KoStopGradientSP m_defaultGradient;
    KoStopGradientSP m_gradient;
    int m_selectedStop;
    int m_hoveredStop;
    KoGradientStop m_removedStop;
    bool m_drag;
    QSize m_handleSize;
    KisSignalCompressor m_updateCompressor;
};
 
#endif