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Qt 图片浏览器 实现图片的放大缩小翻转等功能
图片的功能
源代码:
wiget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QPixmap>
#include <QImage>
#include <QPushButton>
#include <QHBoxLayout>
#include <QScrollArea>
#include <QLabel>
#include <QWidget>
#include <QPalette>
#include <QTimer>
#include <QString>
#include <QPainter>
#include <QPaintEvent>
#include <QDebug>
#include <QFileDialog>
#include <QStringList>
#include <QMessageBox>
#include <QDir>
#include <QFile>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
QLabel *label;
QTimer *timer;
QPixmap pix;
private slots:
void W_timergo();
void W_go();
void W_back();
void W_close();
void W_start();
void W_stop();
void W_max();
void W_min();
void W_flip();
void W_delete();
void W_open();
private:
Ui::Widget *ui;
};
#endif // WIDGET_H
wiget.cpp
#include "widget.h"
#include "ui_widget.h"
static int num;
static int flag=1;
QString image[3] = {":/prefix1/1.jpg",":/prefix1/2.jpg",":/prefix1/3.jpg"};
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
QPixmap pix;
label = new QLabel;
timer = new QTimer;
QPalette palette;
ui->scrollArea->setWidget(label);
ui->scrollArea->setAlignment(Qt::AlignCenter);
palette.setBrush(QPalette::Background,QBrush(QPixmap(":/prefix1/4.jpg")));
this->setPalette(palette);
connect(timer,SIGNAL(timeout()),this,SLOT(W_go()));
connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(W_go()));
connect(ui->pushButton_3,SIGNAL(clicked()),this,SLOT(W_close()));
connect(ui->pushButton_4,SIGNAL(clicked()),this,SLOT(W_start()));
connect(ui->pushButton_5,SIGNAL(clicked()),this,SLOT(W_stop()));
connect(ui->pushButton_2,SIGNAL(clicked()),this,SLOT(W_back()));
connect(ui->pushButton_6,SIGNAL(clicked()),this,SLOT(W_max()));
connect(ui->pushButton_7,SIGNAL(clicked()),this,SLOT(W_min()));
connect(ui->pushButton_8,SIGNAL(clicked()),this,SLOT(W_flip()));
connect(ui->pushButton_9,SIGNAL(clicked()),this,SLOT(W_delete()));
connect(ui->pushButton_10,SIGNAL(clicked()),this,SLOT(W_open()));
}
void Widget::W_timergo()
{
pix.load(image[num]);
label->setPixmap(pix);
if(num==2)
{
num = -1;
}
num++;
}
void Widget::W_go()
{
timer->stop();
pix.load(image[num]);
label->setPixmap(pix);
if(num==2)
{
num = -1;
}
num++;
}
void Widget::W_back()
{
if(num < 0)
{
num = 2;
}
timer->stop();
pix.load(image[num]);
label->setPixmap(pix);
num--;
}
void Widget::W_close()
{
this->close();
}
void Widget::W_start()
{
timer->start(2000);
}
void Widget::W_stop()
{
timer->stop();
}
void Widget::W_max()
{
timer->stop();
float MaxX,MaxY;
MaxX = pix.height();
MaxY = pix.width();
pix = pix.scaled(MaxX*2,MaxY*2,Qt::KeepAspectRatio);
label->setPixmap(pix);
}
void Widget::W_min()
{
timer->stop();
float MaxX,MaxY;
MaxX = pix.height();
MaxY = pix.width();
pix = pix.scaled(MaxX/2,MaxY/2,Qt::KeepAspectRatio);
label->setPixmap(pix);
}
void Widget::W_flip()
{
timer->stop();
QMatrix leftmatrix;
leftmatrix.rotate(90*flag);
flag++;
if(flag == 4)
{
flag = 0;
}
label->setPixmap(QPixmap(image[num]).transformed(leftmatrix,Qt::SmoothTransformation));
}
void Widget::W_delete()
{
timer->stop();
QStringList list;
list=QFileDialog::getOpenFileNames(this,"open image","/","*.jpg");
qDebug()<<list.at(0);
pix.load(list.at(0));
label->setPixmap(pix);
QMessageBox::StandardButton rb = QMessageBox::question(NULL,"Warning",
"Do you want to delete the picture?",QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
if(rb == QMessageBox::Yes)
{
QFile::remove(list.at(0));//刪除文件
}
}
void Widget::W_open()
{
timer->stop();
QStringList list;
list=QFileDialog::getOpenFileNames(this,"open image","/","*.jpg");
qDebug()<<list.at(0);
pix.load(list.at(0));
label->setPixmap(pix);
}
Widget::~Widget()
{
delete ui;
}
main.cpp
#include "widget.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
Qt 图片浏览器 实现图片的放大缩小翻转等功能
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