QT实现屏幕滑动效果窗体
class CScrollScreenView : public QGraphicsView
{
Q_OBJECT
public:
CScrollScreenView(QGraphicsScene *pScene, QWidget *parent);
//设置试图的布局
virtual void SetLayout(QGraphicsLayout *pLayout);
//设置滚动完成的时间，单位：ms
void SetAnimationDuration(int msecs)
{
m_AnimationDuration = msecs;
}
//设置滚动的距离，单位：像素
void SetScrollDist(int dist)
{
m_ScrollDist = dist;
}
//在父窗体上按场景位置显示试图
virtual void ShowView()
{
this->show();
}
private:
int m_AnimationDuration; //屏幕滚动动画控件
int m_ScrollDist; //屏幕滚动的距离
protected:
void resizeEvent(QResizeEvent *event)
{
QGraphicsView::resizeEvent(event);
fitInView(sceneRect(), Qt::KeepAspectRatio);
}
//功能：滚动m_pForm指向的视图窗口
//参数：LeftScroll为true则是向左滚动，否则是向右滚动；dist是滚动的距离
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;
}