QT實作螢幕滑動效果窗體

分類： 2010年 2010-09-09 22:51  1301人閱讀  評論(2)  收藏  舉報

class CScrollScreenView : public QGraphicsView

{      

Q_OBJECT      

public:      

CScrollScreenView(QGraphicsScene *pScene, QWidget *parent);      

//設定試圖的布局      

virtual void SetLayout(QGraphicsLayout *pLayout);      

//設定滾動完成的時間，機關：ms      

void SetAnimationDuration(int msecs)      

{      

m_AnimationDuration = msecs;      

}      

//設定滾動的距離，機關：像素      

void SetScrollDist(int dist)      

{      

m_ScrollDist = dist;      

}      

//在父窗體上按場景位置顯示試圖      

virtual void ShowView()      

{      

this->show();      

}      

private:      

int m_AnimationDuration;    //螢幕滾動動畫控件      

int m_ScrollDist;           //螢幕滾動的距離      

protected:      

void resizeEvent(QResizeEvent *event)      

{      

QGraphicsView::resizeEvent(event);      

fitInView(sceneRect(), Qt::KeepAspectRatio);      

}      

//功能：滾動m_pForm指向的視圖視窗      

//參數：LeftScroll為true則是向左滾動，否則是向右滾動；dist是滾動的距離      

virtual void AnimationForm(bool LeftScroll, int dist);      

QWidget *m_pParent;      

bool m_f_PressMouse;      

QPoint m_StartDragPos;      

QPoint m_ScrollStartPos;      

QGraphicsWidget *m_pForm;      

QGraphicsScene *m_pScene;      

protected slots:      

virtual void mousePressEvent(QMouseEvent *event);      

virtual void mouseReleaseEvent(QMouseEvent *event);      

};      

CScrollScreenView::CScrollScreenView(QGraphicsScene *pScene, QWidget *parent)       
:QGraphicsView(pScene, parent)      
    
{      
    
m_pScene = pScene;      
    
m_pForm = new QGraphicsWidget();      
    
m_pParent = parent;      
    
m_f_PressMouse = false;      
    
m_ScrollStartPos = QPoint(0, 0);      
    
m_AnimationDuration = 1000;      
    
m_ScrollDist = 100;      
    
setBackgroundBrush(QBrush(QColor(0,0,0)));      
    
}      
    
void CScrollScreenView::SetLayout(QGraphicsLayout *pLayout)      
    
{      
    
m_pForm->setLayout(pLayout);      
    
m_pScene->addItem(m_pForm);      
    
pLayout->updateGeometry();      
    
qreal left = 0, top = 0, right = 0, bottom = 0;      
    
m_pForm->getContentsMargins(&left, &top, &right, &bottom );      
    
printf("l=%f,t=%f,r=%f,b=%f/n", left,top,right,bottom);      
    
printf("w=%f,h=%f/n", m_pForm->size().width(),m_pForm->size().height());      
    
}      
    
void CScrollScreenView::AnimationForm(bool LeftScroll, int dist)      
    
{      
    
if(!LeftScroll)      
    
{      
    
QPropertyAnimation *animation = new QPropertyAnimation(m_pForm, "pos");      
    
animation->setDuration(m_AnimationDuration);      
    
animation->setStartValue(m_ScrollStartPos);      
    
m_ScrollStartPos.setX(m_ScrollStartPos.x() + dist);      
    
animation->setEndValue(m_ScrollStartPos);      
    
animation->setEasingCurve(QEasingCurve::Linear);      
    
animation->start();      
    
}      
    
else if(LeftScroll)      
    
{      
    
QPropertyAnimation *animation = new QPropertyAnimation(m_pForm, "pos");      
    
animation->setDuration(m_AnimationDuration);      
    
animation->setStartValue(m_ScrollStartPos);      
    
m_ScrollStartPos.setX(m_ScrollStartPos.x() - dist);      
    
animation->setEndValue(m_ScrollStartPos);      
    
animation->setEasingCurve(QEasingCurve::Linear);      
    
animation->start();      
    
}      
    
}      
    
void CScrollScreenView::mousePressEvent(QMouseEvent *event)      
    
{      
    
QGraphicsView::mousePressEvent(event);      
    
m_f_PressMouse = true;      
    
m_StartDragPos = event->pos();      
    
}      
    
void CScrollScreenView::mouseReleaseEvent(QMouseEvent *event)      
    
{      
    
QGraphicsView::mouseReleaseEvent(event);      
    
if(m_f_PressMouse)      
    
{      
    
QPoint end_pos = event->pos();      
    
if(qAbs(end_pos.x() - m_StartDragPos.x()) >= 10)      
    
{      
    
if(end_pos.x() < m_StartDragPos.x())      
    
{      
    
AnimationForm(true, m_ScrollDist);      
    
}      
    
else if(end_pos.x() > m_StartDragPos.x())      
    
{      
    
AnimationForm(false, m_ScrollDist);      
    
}      
    
}      
    
}      
    
m_f_PressMouse = false;      
    
}