QT开发之gif动画显示

上篇文章我们调到了QSound音频,这篇文章我们讲解QMovie类来显示gif文件.
QMovie有三种运行状态,QMovie::NotRunning(),QMovie::Paused(),QMovie::Running().

新建一个Gui应用项目,名称为myMovie,然后添加下面界面效果的界面(在文章中最后),main.cpp默认

mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QMovie>

namespace Ui {
class MainWindow;
}

class QMovie;
class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private slots:
void on_horizontalSlider_valueChanged(int value);

void on_pushButton_clicked();

void on_pushButton_2_clicked();

void on_pushButton_3_clicked();

void on_spinBox_valueChanged(int value);

void on_pushButton_4_clicked();

private:
Ui::MainWindow *ui;
QMovie *movie;
};

#endif // MAINWINDOW_H


mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMovie>
#include <QString>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
int Imagelines;
ui->setupUi(this);

ui->label->setAlignment(Qt::AlignCenter);
ui->label->setBackgroundRole(QPalette::Dark);
ui->label->setAutoFillBackground(true);

movie = new QMovie(this);
movie->setFileName("./love.gif");

movie->setCacheMode(QMovie::CacheAll);

QSize size = ui->label->size();
movie->setScaledSize(size);
ui->label->setMovie(movie);

ui->horizontalSlider->setMinimum(0);
ui->horizontalSlider->setMaximum(movie->frameCount());
connect(movie, SIGNAL(frameChanged(int)),
ui->horizontalSlider,SLOT(setValue(int)));
Imagelines = movie->frameCount();
qDebug() << "ImageLines" << Imagelines;

}

MainWindow::~MainWindow()
{
delete ui;
}

/* start buttons */
void MainWindow::on_pushButton_clicked()
{
movie->start();
}

/* stop buttons */
void MainWindow::on_pushButton_2_clicked()
{
movie->stop();
}

/* save pix */
void MainWindow::on_pushButton_3_clicked()
{
int id = movie->currentFrameNumber();
QPixmap pix = movie->currentPixmap();
pix.save(QString("./%1.png").arg(id));
qDebug() << "save image";
}

void MainWindow::on_spinBox_valueChanged(int value)
{
movie->setSpeed(value);
}

void MainWindow::on_horizontalSlider_valueChanged(int value)
{
movie->jumpToFrame(value);
}

void MainWindow::on_pushButton_4_clicked()
{
movie->setPaused(1);
qDebug() << "stop is press!";
}


mainwindow.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget">
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>40</x>
<y>190</y>
<width>80</width>
<height>25</height>
</rect>
</property>
<property name="text">
<string>开始</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton_2">
<property name="geometry">
<rect>
<x>40</x>
<y>240</y>
<width>80</width>
<height>25</height>
</rect>
</property>
<property name="text">
<string>停止</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton_3">
<property name="geometry">
<rect>
<x>300</x>
<y>190</y>
<width>80</width>
<height>25</height>
</rect>
</property>
<property name="text">
<string>截屏</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton_4">
<property name="geometry">
<rect>
<x>170</x>
<y>190</y>
<width>80</width>
<height>25</height>
</rect>
</property>
<property name="text">
<string>暂停</string>
</property>
</widget>
<widget class="QSlider" name="horizontalSlider">
<property name="geometry">
<rect>
<x>40</x>
<y>150</y>
<width>331</width>
<height>16</height>
</rect>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition">
<enum>QSlider::TicksBelow</enum>
</property>
<property name="tickInterval">
<number>10</number>
</property>
</widget>
<widget class="QLabel" name="label">
<property name="geometry">
<rect>
<x>20</x>
<y>10</y>
<width>361</width>
<height>121</height>
</rect>
</property>
<property name="text">
<string>Linux_Google</string>
</property>
</widget>
<widget class="QWidget" name="layoutWidget">
<property name="geometry">
<rect>
<x>160</x>
<y>240</y>
<width>123</width>
<height>26</height>
</rect>
</property>
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QLabel" name="label_2">
<property name="text">
<string> 进度</string>
</property>
</widget>
</item>
<item>
<widget class="QSpinBox" name="spinBox">
<property name="suffix">
<string>%</string>
</property>
<property name="maximum">
<number>999</number>
</property>
<property name="value">
<number>100</number>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>22</height>
</rect>
</property>
</widget>
<widget class="QToolBar" name="mainToolBar">
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>


界面效果:



love.gif





                                                                                                                               文章出自:Linux_Google