accordion_frame.h

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#ifndef ACCORDION_FRAME_H
#define ACCORDION_FRAME_H
 
#include <QFrame>
 
class QPropertyAnimation;

class AccordionFrame : public QFrame
{
    Q_OBJECT
public:
    explicit AccordionFrame(QWidget *parent = 0);

    void animatedShow();

    void animatedHide();

    void updateStyleSheet();
 
signals:
    void visibilityChanged(bool visible);
 
protected:
    virtual void hideEvent(QHideEvent *) override { emit visibilityChanged(false); }

    virtual void showEvent(QShowEvent *) override { emit visibilityChanged(true); }
 
private:
    int frame_height_;           
    int design_max_height_;      
    QPropertyAnimation *animation_; 

    int zoomedMaxHeight();
 
private slots:
    void animationFinished();

    void applyZoomedMaxHeight();
};
 
#endif // ACCORDION_FRAME_H