Qt探索之旅（九）简单实现浏览器

切记要在.pro文件里面添加
QT += webkit
我用的Qt4.7.4
（使用到QWebPage等webkit相关可视部件的，Qt5单独放到了QtWebKitWidgets模块中，所以得加头文件#include ，在.pro中要加QT += webkitwidgets
）

**QWebPage类和QWebView类一样，都用于查看和编辑网页，不同的是，从两者的包含关系上我们可以知道，QWebView可以用于打开多个网页，而里面具体的网页对象就是QWebPage。QWebPage通过mainframe（）方法可以得到More QWebView-like functions，如load(), setUrl() 和 setHtml()。

QWebFrame可以算是QWebPage的元对象了，每一个QWebPage至少有一个QWebFrame，它被称作QWebPage的mainframe，通过QWebPage:: mainframe()方法得到。换言之，QWebFrame依附QWebPage存在。通过调用QWebFrame的page()方法返回它所在的QWebPage对象。而zoomFactor()方法则实现了网页内容的缩放。**

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtWebKit/QtWebKit>
#include <QtWebKit/QWebView>
#include <QUrl>
#include <QtDebug>
#include <QProgressBar>//使用进度条
#include <QFile>
#include <QMessageBox>
#include <QTextStream>
#include "dialog.h"


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void initMainPage();
    void setUrlSlot(QUrl);
    void setTitleSlot(QString title);
    void browserWebSlot();
    void deleteProgressBarSlot(bool ok);
    void setMainPageSlot();
    void sourceCodeSlot();

private:
    Ui::MainWindow *ui;
    QProgressBar *progress;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //实例化进度条
    this->progress = new QProgressBar;
    ui->statusBar->addWidget(this->progress);//状态栏添加进度条
    this->initMainPage();//初始化主页
    QObject::connect(ui->webView, SIGNAL(loadProgress(int)), this->progress, SLOT(setValue(int)));
    QObject::connect(ui->webView, SIGNAL(urlChanged(QUrl)), this, SLOT(setUrlSlot(QUrl)));
    QObject::connect(ui->webView, SIGNAL(titleChanged(QString)), this, SLOT(setWindowTitle(QString)));
    QObject::connect(ui->lineEdit, SIGNAL(returnPressed()), this, SLOT(browserWebSlot()));
    QObject::connect(ui->webView, SIGNAL(loadFinished(bool)), this, SLOT(deleteProgressBarSlot(bool)));
    QObject::connect(ui->setMainPageAction, SIGNAL(triggered()), this, SLOT(setMainPageSlot()));
    QObject::connect(ui->viewSourceCodeAction, SIGNAL(triggered()), this, SLOT(sourceCodeSlot()));
}

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


void MainWindow::initMainPage()//初始化主页
{
        QString fileName = "mainpage.ini";
        QFile *file = new QFile;
        file->setFileName("fileName");
        bool ok = file->open(QIODevice::ReadOnly);
        if (ok)
        {
            QTextStream in(file);
            ui->webView->load(QUrl(in.readLine().split("=").at(1)));
            file->close();
            delete file;
            file = NULL;
        }
        else
        {
            QMessageBox::information(this, "Error Message", "Init Main Page Error" + file->errorString());
            return;
        }
}


void MainWindow::setUrlSlot(QUrl url)//网页更改修改url输入框
{
    ui->lineEdit->setText(url.toString());
}


void MainWindow::setTitleSlot(QString title)//网页更改修改标题
{
    this->setWindowTitle(title);
}


void MainWindow::browserWebSlot()//lineEdit回车(returnPressed)刷新网页
{
    //qDebug() << ui->lineEdit->text();
    ui->webView->load(QUrl(ui->lineEdit->text()));
}


void MainWindow::deleteProgressBarSlot(bool ok)//显示过后 删除进度条
{
    if (ok)
    {
        delete this->progress;
        this->progress = NULL;
        //状态栏，进度条加载完毕后显示"Load Finished"持续5秒后状态栏信息消失
        this->ui->statusBar->showMessage("Load Finished", 5*1000);
    }
}


void MainWindow::sourceCodeSlot()//查看网页源代码
{
    QString context = ui->webView->page()->currentFrame()->toHtml();
    //ui->textEdit->setText();
    Dialog *dialog = new Dialog;
    dialog->setWebSource(context);
    dialog->show();
}

void MainWindow::setMainPageSlot()//设置主页
{
    QString fileName = "mainpage.ini";
    QFile *file = new QFile;
    file->setFileName(fileName);
    bool ok = file->open(QIODevice::WriteOnly);
    if (ok)
    {
        QTextStream out(file);
        out << "mainpage="+ui->lineEdit->text();
        file->close();
        delete file;
        file = NULL;

        QMessageBox::information(this, "Information", "Set MaiaPage Success");
    }
    else
    {
        qDebug()<< "main page error" << file->errorString();
        return;
    }
}

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

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

    void setWebSource(QString context);
    //给Dialog的文本编辑器进行设置文本
private:
    Ui::Dialog *ui;   
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
}

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

void Dialog::setWebSource(QString context)
{
    ui->textEdit->setPlainText(context);//设置纯文本
}

main.cpp

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

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