Qt中的标准对话框

1. Qt为开发者提供了一些可复用的对话框类型，如QMessageBox，QFileDialog，QPrintDialog， QColorDialog， QInputDialog， QProgressDialog等，他们全部继承与QDialog类。

2. Qt中的对话框遵循相同的使用方式：

    DialogType dlg(this);                  /* 1. 定义对话框对象 */

    dlg.setPropertyxxx(value);             /* 2. 设置对话框属性 */

    if(dlg.exec() == DialogType::Value)
    {
        Type v = dlg.getDialogValue();     /* 3. 获取对话框数据 */
        ...                                /* 4. 处理对话框数据 */
    } 

3. 简单实例

Widget.h：

#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui/QWidget>
#include <QPushButton>

class Widget : public QWidget
{
    Q_OBJECT
private:
    QPushButton SimpleMsgBtn;
    QPushButton CustomMsgBtn;
    QPushButton OpenFileBtn;
    QPushButton SaveFileBtn;
    QPushButton QColorBtn;
    QPushButton InputBtn;
    QPushButton QFontBtn;
    QPushButton QProgressBtn;
    QPushButton QPrintBtn;
private slots:
    void SmipleMsgBtn_Clicked();
    void CustomMsgBtn_Clicked();
    void OpenFileBtn_Clicked();
    void SaveFileBtn_Clicked();
    void QColorBtn_Clicked();
    void InputBtn_Clicked();
    void QFontBtn_Clicked();
    void QProgressBtn_Clicked();
    void QPrintBtn_Clicked();
public:
    Widget(QWidget *parent = 0);
    ~Widget();
};

#endif // WIDGET_H

Widget.cpp:

#include <QDebug>
#include <QMessageBox>
#include <QFileDialog>
#include <QColorDialog>
#include <QInputDialog>
#include <QFontDialog>
#include <QProgressDialog>
#include <QPrintDialog>
#include <QTextDocument>
#include "Widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent), SimpleMsgBtn(this), CustomMsgBtn(this), OpenFileBtn(this), SaveFileBtn(this),
      QColorBtn(this), InputBtn(this), QFontBtn(this), QProgressBtn(this), QPrintBtn(this)
{
    SimpleMsgBtn.setText("Simple Message Dialog");
    SimpleMsgBtn.move(20, 20);
    SimpleMsgBtn.resize(160, 20);

    CustomMsgBtn.setText("Custom Message Dialog");
    CustomMsgBtn.move(20, 60);
    CustomMsgBtn.resize(160, 20);

    OpenFileBtn.setText("Open File Message Dialog");
    OpenFileBtn.move(20, 100);
    OpenFileBtn.resize(160, 20);

    SaveFileBtn.setText("Save File Message Dialog");
    SaveFileBtn.move(20, 140);
    SaveFileBtn.resize(160, 20);

    QColorBtn.setText("QColor Dialog");
    QColorBtn.move(20, 180);
    QColorBtn.resize(160, 20);

    InputBtn.setText("Input Dialog");
    InputBtn.move(20, 220);
    InputBtn.resize(160, 20);

    QFontBtn.setText("QFont Dialog");
    QFontBtn.move(20, 260);
    QFontBtn.resize(160, 20);

    QProgressBtn.setText("QProgress Dialog");
    QProgressBtn.move(20, 300);
    QProgressBtn.resize(160, 20);

    QPrintBtn.setText("QPrint Dialog");
    QPrintBtn.move(20, 340);
    QPrintBtn.resize(160, 20);


    resize(200, 400);
    setFixedSize(200, 400);

    connect(&SimpleMsgBtn, SIGNAL(clicked()), this, SLOT(SmipleMsgBtn_Clicked()));
    connect(&CustomMsgBtn, SIGNAL(clicked()), this, SLOT(CustomMsgBtn_Clicked()));
    connect(&OpenFileBtn, SIGNAL(clicked()), this, SLOT(OpenFileBtn_Clicked()));
    connect(&SaveFileBtn, SIGNAL(clicked()), this, SLOT(SaveFileBtn_Clicked()));

    connect(&QColorBtn, SIGNAL(clicked()), this, SLOT(QColorBtn_Clicked()));
    connect(&InputBtn, SIGNAL(clicked()), this, SLOT(InputBtn_Clicked()));

    connect(&QFontBtn, SIGNAL(clicked()), this, SLOT(QFontBtn_Clicked()));
    connect(&QProgressBtn, SIGNAL(clicked()), this, SLOT(QProgressBtn_Clicked()));
    connect(&QPrintBtn, SIGNAL(clicked()), this, SLOT(QPrintBtn_Clicked()));
}

void Widget::SmipleMsgBtn_Clicked()
{
    qDebug() << "SmipleMsgBtn_Clicked start";

    QMessageBox msg(this);

    msg.setText("This is a message dialog");

    msg.exec();

    qDebug() << "SmipleMsgBtn_Clicked end";
}

void  Widget::CustomMsgBtn_Clicked()
{
    qDebug() << "CustomMsgBtn_Clicked start";

    QMessageBox msg(this);

    msg.setWindowTitle("Window Tile");
    msg.setText("This is a message dialog");
    msg.setIcon(QMessageBox::Information);
    msg.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel | QMessageBox::YesToAll);

    qDebug() << msg.standardButtons();
    int r = msg.exec();

    if(r == QMessageBox::Ok)
    {
         qDebug() << "OK";
    }

    qDebug() << "CustomMsgBtn_Clicked end";
}

void  Widget::OpenFileBtn_Clicked()
{
    qDebug() << "OpenFileBtn_Clicked start";

    QFileDialog dlg(this);

    dlg.setAcceptMode(QFileDialog::AcceptOpen);
    dlg.setFilter("Text(*.txt)");
    dlg.setFileMode(QFileDialog::ExistingFiles);

    if(dlg.exec() == QFileDialog::Accepted)
    {
        QStringList fs = dlg.selectedFiles();
        qDebug() << fs;
    }

    qDebug() << "OpenFileBtn_Clicked end";
}

void  Widget::SaveFileBtn_Clicked()
{
    qDebug() << "SaveFileBtn_Clicked start";

    QFileDialog dlg(this);

    dlg.setAcceptMode(QFileDialog::AcceptSave);
    dlg.setFilter("Text(*.txt)");

    if(dlg.exec() == QFileDialog::Accepted)
    {
        QStringList fs = dlg.selectedFiles();
        qDebug() << fs;
    }

    qDebug() << "SaveFileBtn_Clicked end";
}

void Widget::QColorBtn_Clicked()
{
    qDebug() << "QColorBtn_Clicked start";

    QColorDialog dlg(this);

    dlg.setWindowTitle("Color Editer");
    dlg.setCurrentColor(QColor(100, 111, 240));

    if(dlg.exec() == QColorDialog::Accepted)
    {
        QColor color = dlg.selectedColor();

        qDebug() << color;
        qDebug() << color.red();
        qDebug() << color.green();
        qDebug() << color.blue();
        qDebug() << color.hsvHue();
        qDebug() << color.saturation();
        qDebug() << color.value();
    }

    qDebug() << "QColorBtn_Clicked end";
}

void Widget::InputBtn_Clicked()
{
    qDebug() << "InputBtn_Clicked start";
    QInputDialog dlg(this);

    dlg.setWindowTitle("Input...");
    dlg.setLabelText("Please input a string");
    dlg.setInputMode(QInputDialog::TextInput);

    if(dlg.exec() == QInputDialog::Accepted)
    {
        qDebug() << dlg.textValue();
    }

    qDebug() << "InputBtn_Clicked end";
}

void Widget::QFontBtn_Clicked()
{
    qDebug() << "QFontBtn_Clicked start";
    QFontDialog dlg(this);

    dlg.setWindowTitle("Font Editor");
    dlg.setCurrentFont(QFont("Arial", 10, QFont::Normal));


    if(dlg.exec() == QFontDialog::Accepted)
    {
        qDebug() << dlg.selectedFont();
    }

    qDebug() << "QFontBtn_Clicked end";
}

void Widget::QProgressBtn_Clicked()
{
    qDebug() << "QProgressBtn_Clicked start";

    QProgressDialog dlg(this);

    dlg.setWindowTitle("Updating...");
    dlg.setLabelText("Donwloading from server...");
    dlg.setMinimum(0);
    dlg.setMaximum(100);

    dlg.setValue(50);

    //Create a new thread, download and updat value

    dlg.exec();

    qDebug() << "QProgressBtn_Clicked end";
}

void Widget::QPrintBtn_Clicked()
{
    qDebug() << "QPrintBtn_Clicked start";

    QPrintDialog dlg(this);

    if(dlg.exec() == QPrintDialog::Accepted)
    {
        QPrinter* p = dlg.printer();

        QTextDocument td;

        td.setPlainText("Print Object Test");

        td.print(p);

        qDebug() << "QPrintDialog::Accepted";
    }

    qDebug() << "QPrintBtn_Clicked end";
}


Widget::~Widget()
{
    
}