QT实现屏幕滑动效果窗体

QT实现屏幕滑动效果窗体

{

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;

}