qt-creator/src/libs/utils/detailsbutton.h

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#ifndef DETAILSBUTTON_H
#define DETAILSBUTTON_H

#include "utils_global.h"

#include <QAbstractButton>

QT_FORWARD_DECLARE_CLASS(QGraphicsOpacityEffect)

namespace Utils {
class QTCREATOR_UTILS_EXPORT FadingPanel : public QWidget
{
    Q_OBJECT

public:
    FadingPanel(QWidget *parent = 0)
        : QWidget(parent)
    {}
    virtual void fadeTo(qreal value) = 0;
    virtual void setOpacity(qreal value) = 0;
};

class QTCREATOR_UTILS_EXPORT FadingWidget : public FadingPanel
{
    Q_OBJECT
public:
    FadingWidget(QWidget *parent = 0);
    void fadeTo(qreal value);
    qreal opacity();
    void setOpacity(qreal value);
protected:
    QGraphicsOpacityEffect *m_opacityEffect;
};

class QTCREATOR_UTILS_EXPORT DetailsButton : public QAbstractButton
{
    Q_OBJECT
    Q_PROPERTY(float fader READ fader WRITE setFader)

public:
    DetailsButton(QWidget *parent = 0);

    QSize sizeHint() const;
    float fader() { return m_fader; }
    void setFader(float value) { m_fader = value; update(); }

protected:
    void paintEvent(QPaintEvent *e);
    bool event(QEvent *e);

private:
    QPixmap cacheRendering(const QSize &size, bool checked);
    QPixmap m_checkedPixmap;
    QPixmap m_uncheckedPixmap;
    float m_fader;
};
} // namespace Utils
#endif // DETAILSBUTTON_H