Qt工作笔记-QDialog模式对话框传递数据给主窗口

话不多说，上图：

这里同样是采用了Qt的信号与槽机制。

项目文件分布如下：

代码如下：

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include 

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT
signals:
    void sendData(QString data);

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

public slots:
    void pressBtn();

private:
    Ui::Dialog *ui;
};

#endif // DIALOG_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include "dialog.h"

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public slots:
    void pressBtn();
    void updateData(QString data);
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private:
    Ui::Widget *ui;
    Dialog *dialog;
};

#endif // WIDGET_H

dialog.cpp

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

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(pressBtn()));
}

void Dialog::pressBtn(){
    emit sendData(ui->lineEdit->text());
    this->close();
}

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

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(pressBtn()));
}

void Widget::updateData(QString data){
    ui->textEdit->append(data);
}

void Widget::pressBtn(){
    dialog=new Dialog();
    connect(dialog,SIGNAL(sendData(QString)),this,SLOT(updateData(QString)));
    if(dialog->exec()==QDialog::Accepted){
    }
    delete dialog;

}

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

main.cpp

#include "widget.h"
#include 

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

    return a.exec();
}