#ifndef _WIDGET_H_
#define _WIDGET_H_

#include <QWidget>
#include <QPushButton>

class Widget : public QWidget
{
    Q_OBJECT
private:
    QPushButton FontDialogBtn;
    QPushButton ProgressDialogBtn;
    QPushButton PrintDialogBtn;

private slots:
    void FontDialogBtn_Clicked();
    void ProgressDialogBtn_Clicked();
    void PrintDialogBtn_Clicked();

public:
    Widget(QWidget* parent = 0);
    ~Widget();
};

#endif  //_WIDGET_H_

#include "Widget.h"
#include <QFontDialog>
#include <QPrintDialog>
#include <QPrinter>
#include <QTextDocument>
#include <QProgressDialog>
#include <QDebug>

Widget::Widget(QWidget* parent):QWidget(parent),
     FontDialogBtn(this),ProgressDialogBtn(this),PrintDialogBtn(this)
{
    FontDialogBtn.setText("Font Dialog");
    FontDialogBtn.move(20, 20);
    FontDialogBtn.resize(160, 30);

    ProgressDialogBtn.setText("Progress Dialog");
    ProgressDialogBtn.move(20, 70);
    ProgressDialogBtn.resize(160, 30);

    PrintDialogBtn.setText("Print Dialog");
    PrintDialogBtn.move(20, 120);
    PrintDialogBtn.resize(160, 30);

    resize(200, 170);
    setFixedSize(200, 170);

    connect(&FontDialogBtn,     SIGNAL(clicked()), this, SLOT(FontDialogBtn_Clicked()));
    connect(&ProgressDialogBtn, SIGNAL(clicked()), this, SLOT(ProgressDialogBtn_Clicked()));
    connect(&PrintDialogBtn,    SIGNAL(clicked()), this, SLOT(PrintDialogBtn_Clicked()));
}


void Widget::FontDialogBtn_Clicked()//与颜色对话框用法一样
{
    QFontDialog dlg(this);//1.定义

    dlg.setWindowTitle("QFontDialog");//2.设置
    dlg.setCurrentFont(QFont("Courier New", 10, QFont::Bold));//设置初始字体，参数是调用字体设置的构造函数

    if(dlg.exec() == QDialog::Accepted)//3.显示
    {
        qDebug() << dlg.selectedFont();
    }
}

void Widget::ProgressDialogBtn_Clicked()//依旧是三板斧
{
    QProgressDialog dlg(this);

    dlg.setWindowTitle("QProgressDialog");
    dlg.setLabelText("Dowload...");
    dlg.setMinimum(0);
    dlg.setMaximum(100);

    dlg.setValue(30);//设置当前进度框的位置
    //实际应用时，会开一个线程来进行下载东西，然后久不久调用setValue()函数一次

    dlg.exec();//没有if语句的原因是进度条对话框一般就是让人等待的

}

void Widget::PrintDialogBtn_Clicked()
{
    QPrintDialog dlg(this);

    dlg.setWindowTitle("QPrintDialog");

    if(dlg.exec() == QPrintDialog::Accepted)
    {
        QPrinter* p = dlg.printer();//将参数设置进打印机
        QTextDocument tb;
        tb.setPlainText("Hello Qt");

        p->setOutputFileName("D:\\Hello.pdf");

        tb.print(p);
    }
}

Widget::~Widget()
{

}

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

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    
    return a.exec();
}