Qt学习笔记——动画2

上一次做的效果不符合老板意思，需要图片连续显示，这次修改了代码，实现图片连续播放，代码如下：

#ifndef ANIMATION_H
#define ANIMATION_H

#include <QWidget>
#include <QTimer>
#include <QResizeEvent>
#include <QFrame>
#include <QSize>
#include <QPropertyAnimation>
#include <QParallelAnimationGroup>

class AnimationWidget : public QWidget
{
Q_OBJECT
public:
explicit AnimationWidget(QWidget *parent = 0);
~AnimationWidget();

signals:

public slots:
void nextImage();
void previousImage();

protected:
void resizeEvent(QResizeEvent *event);

private:
void flushAnimationTargetNext(int currentImg);

QSize windowsSize;

QPropertyAnimation *nextAnimation[2];
QParallelAnimationGroup *nextParallelGroup;

QFrame *imageFrame[4];

int currentAnimation;
};

#endif // ANIMATION_H


#include "animationwidget.h"
#include <QPoint>
#include <QTimer>
#include <QDebug>

#define ANIMATION_DURATION 2000

AnimationWidget::AnimationWidget(QWidget *parent) : QWidget(parent)
{
setWindowFlags(Qt::FramelessWindowHint);
windowsSize.setWidth(274);
windowsSize.setHeight(143);

currentAnimation = 0;

nextParallelGroup = new QParallelAnimationGroup(this);
for (int i = 0; i < 2; ++i)
{
nextAnimation[i] = new QPropertyAnimation(this);
nextParallelGroup->addAnimation(nextAnimation[i]);
}

for (int i = 0; i < 4; ++i)
{
imageFrame[i] = new QFrame(this);
imageFrame[i]->setObjectName("avatar");
imageFrame[i]->setStyleSheet(QString("QFrame#avatar{border-image:url(:/image/photo%1)}").arg(i+1));
}

flushAnimationTargetNext(currentAnimation);

resize(windowsSize);

connect(nextParallelGroup, SIGNAL(finished()), this, SLOT(nextImage()));
nextImage();
}

AnimationWidget::~AnimationWidget()
{
if (nextParallelGroup != NULL)
{
delete nextParallelGroup;
nextParallelGroup = NULL;
}

for (int i = 0; i < 2; ++i)
{
if (nextAnimation[i] != NULL)
{
delete nextAnimation[i];
nextAnimation[i] = NULL;
}
}
}

void AnimationWidget::nextImage()
{
nextParallelGroup->stop();
imageFrame[currentAnimation]->setVisible(false);
imageFrame[(currentAnimation+1)%4]->setVisible(true);

currentAnimation = (currentAnimation + 1) % 4;

imageFrame[currentAnimation]->setVisible(true);
imageFrame[(currentAnimation+1)%4]->setVisible(true);

flushAnimationTargetNext(currentAnimation);
nextParallelGroup->start();
}

void AnimationWidget::previousImage()
{
nextParallelGroup->stop();

flushAnimationTargetNext(currentAnimation);
nextParallelGroup->start();
}

void AnimationWidget::resizeEvent(QResizeEvent *event)
{
for (int i = 0; i < 4; ++i)
imageFrame[i]->setGeometry(-windowsSize.width(), 0, windowsSize.width(), windowsSize.height());
}

void AnimationWidget::flushAnimationTargetNext(int currentImg)
{
nextAnimation[0]->setStartValue(QPoint(0, 0));
nextAnimation[0]->setEndValue(QPoint(windowsSize.width(), 0));
nextAnimation[0]->setPropertyName("pos");
nextAnimation[0]->setTargetObject(imageFrame[currentImg]);
nextAnimation[0]->setDuration(ANIMATION_DURATION);

currentImg = (currentImg + 1) % 4;
nextAnimation[1]->setStartValue(QPoint(-windowsSize.width(), 0));
nextAnimation[1]->setEndValue(QPoint(0, 0));
nextAnimation[1]->setPropertyName("pos");
nextAnimation[1]->setTargetObject(imageFrame[currentImg]);
nextAnimation[1]->setDuration(ANIMATION_DURATION);
}