qt4第二例：mini图片浏览器

很简单的一个图片浏览器，可以从打开按钮打开图片文件。上一张和下一张的功能还没实现。程序代码如下

头文件:picbrowser.h




/**//*


* 文件：picbrowser.h


* 作者：yangdk


* Email:jidacun@163.com


* 主页：http://blog.csdn.net/yang_dk


*/




#ifndef _PICBROWSER_H_


#define _PICBROWSER_H_




#include <QDialog>




class QPushButton;


class QPixmap;


class QFileDialog;


class QHBoxLayout;


class QVBoxLayout;


class QLabel; //放图片




class PicBrowser:public QDialog




...{


Q_OBJECT


public:


PicBrowser(QWidget *parent=0);




private:


QPushButton *openButton,*closeButton,*prevButton,*nextButton;


QPixmap *pixmap;


QHBoxLayout *bottom;


QVBoxLayout *mainLayout;


QLabel *picLabel;




public slots:


void openPic();


void prevPic();


void nextPic();


void exitapp();


};




#endif

picbrowser.cpp




/**//*


* 文件：picbrowser.cpp


* 作者：yangdk


* Email:jidacun@163.com


* 主页：http://blog.csdn.net/yang_dk


*/




#include "picBrowser.h"


#include <QtGui>


#include <iostream.h>




PicBrowser::PicBrowser(QWidget *parent):QDialog(parent)




...{


openButton = new QPushButton(tr("open"));


closeButton= new QPushButton(tr("close"));


prevButton = new QPushButton(tr("prev"));


nextButton = new QPushButton(tr("next"));


connect(openButton,SIGNAL(clicked()),this,SLOT(openPic()));


connect(closeButton,SIGNAL(clicked()),this,SLOT(exit(0)));


connect(closeButton,SIGNAL(clicked()),this,SLOT(exitapp()));


connect(prevButton,SIGNAL(clicked()),this,SLOT(prevPic()));


connect(nextButton,SIGNAL(clicked()),this,SLOT(nextPic()));




pixmap = new QPixmap("1.jpg"); //默认打开当前目录下的1.jpg文件


picLabel=new QLabel; //使用一个Label来显示图片，将图片作为Label的Icon而已，呵呵


picLabel->setPixmap(*pixmap);




//pixmap->setRange








//布局


bottom = new QHBoxLayout;


bottom->addWidget(openButton);


bottom->addWidget(prevButton);


bottom->addWidget(nextButton);


bottom->addWidget(closeButton);




mainLayout = new QVBoxLayout;


mainLayout->addWidget(picLabel);


mainLayout->addLayout(bottom);




setLayout(mainLayout);


}




void PicBrowser::openPic()




...{


//打开一张图片



QString filename=QFileDialog::getOpenFileName(this,"open a picture","/",tr("Images(*.bmp *.jpg *.png)"));


pixmap->load(filename);


picLabel->setPixmap(*pixmap);


}




void PicBrowser::prevPic()




...{


QMessageBox::information(this,"xiaoxi","not implement,please choose open",QMessageBox::Close);


}




void PicBrowser::nextPic()




...{


QMessageBox::information(this,"xiaoxi","not implement,please choose open",QMessageBox::Close);


}


void PicBrowser::exitapp()




...{


exit(0);


}

main.cpp


#include <QApplication>


#include "picbrowser.h"




int main(int argc,char *argv[])




...{


QApplication app(argc,argv);


PicBrowser picBS;


return picBS.exec();


}