QDialog 使用Demo

【1】.pro

 QT       += core gui

 greaterThan(QT_MAJOR_VERSION, ): QT += widgets

 TARGET = TestDialog
 TEMPLATE = app

 # The following define makes your compiler emit warnings if you use
 # any feature of Qt which as been marked as deprecated (the exact warnings
 # depend on your compiler). Please consult the documentation of the
 # deprecated API in order to know how to port your code away from it.
 DEFINES += QT_DEPRECATED_WARNINGS

 # You can also make your code fail to compile if you use deprecated APIs.
 # In order to do so, uncomment the following line.
 # You can also select to disable deprecated APIs only up to a certain version of Qt.
 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.

 SOURCES += main.cpp\
         dialog.cpp

 HEADERS  += dialog.h

 FORMS    += dialog.ui

【2】.h

 #ifndef DIALOG_H
 #define DIALOG_H

 #include <QDebug>
 #include <QDialog>
 #include <QPushButton>
 #include <QHBoxLayout>

 namespace Ui
 {
 class Dialog;
 }

 class MyDialog : public QDialog
 {
 public:
     MyDialog(QWidget *parent = Q_NULLPTR);
     ~MyDialog();

 private:
     void init();

 private:
     QPushButton* m_p1;
     QPushButton* m_p2;

 };

 class Dialog : public QDialog
 {
     Q_OBJECT

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

 private slots:
     void onPushButton();

 private:
     Ui::Dialog *ui;
     MyDialog *m_pDialog;
 };

 #endif // DIALOG_H

【3】.cpp

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

 MyDialog::MyDialog(QWidget *parent) : QDialog(parent)
 {
     init();
 }

 MyDialog::~MyDialog()
 {

 }

 void MyDialog::init()
 {
     m_p1 = new QPushButton(this);
     m_p1->setText(QString("OK"));
     m_p2 = new QPushButton(this);
     m_p2->setText(QString("Cancel"));
     connect(m_p1, &QPushButton::clicked, this, &MyDialog::accept);
     connect(m_p2, &QPushButton::clicked, this, &MyDialog::reject);
     QHBoxLayout* pHLayout = new QHBoxLayout(this);
     pHLayout->addWidget(m_p1);
     pHLayout->addWidget(m_p2);
     setLayout(pHLayout);
 }

 Dialog::Dialog(QWidget *parent) :
     QDialog(parent),
     ui(new Ui::Dialog)
 {
     ui->setupUi(this);
     m_pDialog = new MyDialog();
     connect(ui->pushButton, &QPushButton::clicked, this, &Dialog::onPushButton);
 }

 Dialog::~Dialog()
 {
     delete ui;
     if (m_pDialog != Q_NULLPTR)
     {
         delete m_pDialog;
         m_pDialog = Q_NULLPTR;
     }
 }

 void Dialog::onPushButton()
 {
     int nRet = m_pDialog->exec();
     if (nRet == QDialog::Accepted)
     {
         qDebug() << "Click OK Button";
         qApp->exit();
     }
     else if (nRet == QDialog::Rejected)
     {
         qDebug() << "Click Cancel Button";
         return;
     }
 }

【4】main

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

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

     return a.exec();
 }

【5】验证一个问题

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