qt-creator/src/plugins/coreplugin/styleanimator.h

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#ifndef ANIMATION_H
#define ANIMATION_H

#include <QtCore/QPointer>
#include <QtCore/QTime>
#include <QtCore/QBasicTimer>
#include <QtGui/QStyle>
#include <QtGui/QPainter>
#include <QtGui/QWidget>

/* 
 * This is a set of helper classes to allow for widget animations in
 * the style. Its mostly taken from Vista style so it should be fully documented
 * there.
 *
 */
 
class Animation
{
public :
    Animation() : m_running(true) { }
    virtual ~Animation() { }
    QWidget * widget() const { return m_widget; }
    bool running() const { return m_running; }
    const QTime &startTime() const { return m_startTime; }
    void setRunning(bool val) { m_running = val; }
    void setWidget(QWidget *widget) { m_widget = widget; }
    void setStartTime(const QTime &startTime) { m_startTime = startTime; }
    virtual void paint(QPainter *painter, const QStyleOption *option);

protected:
    void drawBlendedImage(QPainter *painter, QRect rect, float value);
    QTime m_startTime;
    QPointer<QWidget> m_widget;
    QImage m_primaryImage;
    QImage m_secondaryImage;
    QImage m_tempImage;
    bool m_running;
};

// Handles state transition animations
class Transition : public Animation
{
public :
    Transition() : Animation() {}
    virtual ~Transition() {}
    void setDuration(int duration) { m_duration = duration; }
    void setStartImage(const QImage &image) { m_primaryImage = image; }
    void setEndImage(const QImage &image) { m_secondaryImage = image; }
    virtual void paint(QPainter *painter, const QStyleOption *option);
    int duration() const { return m_duration; }
    int m_duration; //set time in ms to complete a state transition
};

class StyleAnimator : public QObject
{
    Q_OBJECT;

public:
    StyleAnimator(QObject *parent = 0) : QObject(parent) {}

    void timerEvent(QTimerEvent *);
    void startAnimation(Animation *);
    void stopAnimation(const QWidget *);
    Animation* widgetAnimation(const QWidget *) const;
    
private:
    QBasicTimer animationTimer;
    QList <Animation*> animations;
};

#endif // ANIMATION_H