第19课 Qt中的标准对话框(上)

//1、定义对话框对象（第1板斧）
DialogType dlg(this);

//2、设置对话框属性（第2板斧）
dlg.setPropertyXXX(value);

if(dlg.exec() == DialogType::value) //3.打开对话框（第3板斧）
{
    //4、获取对话框数据
    Type v = dlg.getDialogValue();
    
    //处理对话框数据
}

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

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

    return a.exec();
}

#ifndef _WIDGET_H_
#define _WIDGET_H_

#include <QWidget>
#include <QPushButton>

class Widget : public QWidget
{
    Q_OBJECT
private:
    QPushButton SimpleMsgBtn;
    QPushButton CustomMsgBtn;
    QPushButton OpenFileBtn;
    QPushButton SaveFileBtn;

private slots:
    void SimpleMsgBtn_Clicked();
    void CustomMsgBtn_Clicked();
    void OpenFileBtn_Clicked();
    void SaveFileBtn_Clicked();

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

#endif  //_WIDGET_H_

#include "Widget.h"
#include <QMessageBox>
#include <QFileDialog>
#include <QDebug>

Widget::Widget(QWidget* parent):QWidget(parent),
     SimpleMsgBtn(this),CustomMsgBtn(this),OpenFileBtn(this),SaveFileBtn(this)
{
    SimpleMsgBtn.setText("Simple MessageBox");
    SimpleMsgBtn.move(20, 20);
    SimpleMsgBtn.resize(160, 30);

    CustomMsgBtn.setText("Custom MessageBox");
    CustomMsgBtn.move(20, 70);
    CustomMsgBtn.resize(160, 30);

    OpenFileBtn.setText("OpenFile Dialog");
    OpenFileBtn.move(20, 120);
    OpenFileBtn.resize(160, 30);

    SaveFileBtn.setText("SaveFile Dialog");
    SaveFileBtn.move(20, 170);
    SaveFileBtn.resize(160, 30);

    resize(200, 200);
    setFixedSize(200, 220);

    connect(&SimpleMsgBtn, SIGNAL(clicked()), this, SLOT(SimpleMsgBtn_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()));
}


void Widget::SimpleMsgBtn_Clicked()
{
    QMessageBox msg(this);
    msg.setText("This is a MessageBox!");
    msg.exec();
}

void Widget::CustomMsgBtn_Clicked()
{
    QMessageBox msg(this);

    msg.setWindowTitle("Custom Messagebox");
    msg.setText("This is a detail MessageBox");
    msg.setIcon(QMessageBox::Information);
    msg.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel |
                           QMessageBox::YesToAll);

    //information(QWidget *parent, const QString &title, const QString &text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton)
    //int ret = QMessageBox::information(this, "Custom MessageBox",
    //                                   "This is a detail MessageBox"),
    //                                    QMessageBox::Ok | QMessageBox::Cancel | QMessageBox::YesToAll);

    if(msg.exec() == QMessageBox::Ok)
    {
        qDebug() << "Ok button is Clicked!";
    }
}

void Widget::OpenFileBtn_Clicked()
{
    QFileDialog dlg(this);

    dlg.setAcceptMode(QFileDialog::AcceptOpen);
    //Qt5.5以下用dlg.setFilter
    dlg.setNameFilter("Images (*.png *.xpm *.jpg);;Text files (*.txt);;XML files (*.xml);;All(*.*)");
    dlg.setFileMode(QFileDialog::ExistingFiles); //注意：复数形式，表达打开多个文件

    if(dlg.exec() == QFileDialog::Accepted)
    {
        QStringList fs = dlg.selectedFiles();
        for(int i=0; i<fs.count(); i++)
        {
            qDebug() << fs[i];
        }
    }
}

void Widget::SaveFileBtn_Clicked()
{
    QFileDialog dlg(this);

    dlg.setAcceptMode(QFileDialog::AcceptSave);
    dlg.setNameFilter("Images (*.png *.xpm *.jpg);;Text files (*.txt);;XML files (*.xml);;All(*.*)");

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

        for(int i=0; i<fs.count();i++)
        {
            qDebug() << fs[i];
        }
    }
}

Widget::~Widget()
{

}