QDialog 使用Demo

【1】.pro

 1 QT       += core gui
 2 
 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 4 
 5 TARGET = TestDialog
 6 TEMPLATE = app
 7 
 8 # The following define makes your compiler emit warnings if you use
 9 # any feature of Qt which as been marked as deprecated (the exact warnings
10 # depend on your compiler). Please consult the documentation of the
11 # deprecated API in order to know how to port your code away from it.
12 DEFINES += QT_DEPRECATED_WARNINGS
13 
14 # You can also make your code fail to compile if you use deprecated APIs.
15 # In order to do so, uncomment the following line.
16 # You can also select to disable deprecated APIs only up to a certain version of Qt.
17 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
18 
19 
20 SOURCES += main.cpp\
21         dialog.cpp
22 
23 HEADERS  += dialog.h
24 
25 FORMS    += dialog.ui

【2】.h

 1 #ifndef DIALOG_H
 2 #define DIALOG_H
 3 
 4 #include <QDebug>
 5 #include <QDialog>
 6 #include <QPushButton>
 7 #include <QHBoxLayout>
 8 
 9 namespace Ui
10 {
11 class Dialog;
12 }
13 
14 class MyDialog : public QDialog
15 {
16 public:
17     MyDialog(QWidget *parent = Q_NULLPTR);
18     ~MyDialog();
19 
20 private:
21     void init();
22 
23 private:
24     QPushButton* m_p1;
25     QPushButton* m_p2;
26 
27 };
28 
29 class Dialog : public QDialog
30 {
31     Q_OBJECT
32 
33 public:
34     explicit Dialog(QWidget *parent = 0);
35     ~Dialog();
36 
37 private slots:
38     void onPushButton();
39 
40 private:
41     Ui::Dialog *ui;
42     MyDialog *m_pDialog;
43 };
44 
45 #endif // DIALOG_H

【3】.cpp

 1 #include "dialog.h"
 2 #include "ui_dialog.h"
 3 
 4 MyDialog::MyDialog(QWidget *parent) : QDialog(parent)
 5 {
 6     init();
 7 }
 8 
 9 MyDialog::~MyDialog()
10 {
11 
12 }
13 
14 void MyDialog::init()
15 {
16     m_p1 = new QPushButton(this);
17     m_p1->setText(QString("OK"));
18     m_p2 = new QPushButton(this);
19     m_p2->setText(QString("Cancel"));
20     connect(m_p1, &QPushButton::clicked, this, &MyDialog::accept);
21     connect(m_p2, &QPushButton::clicked, this, &MyDialog::reject);
22     QHBoxLayout* pHLayout = new QHBoxLayout(this);
23     pHLayout->addWidget(m_p1);
24     pHLayout->addWidget(m_p2);
25     setLayout(pHLayout);
26 }
27 
28 Dialog::Dialog(QWidget *parent) :
29     QDialog(parent),
30     ui(new Ui::Dialog)
31 {
32     ui->setupUi(this);
33     m_pDialog = new MyDialog();
34     connect(ui->pushButton, &QPushButton::clicked, this, &Dialog::onPushButton);
35 }
36 
37 Dialog::~Dialog()
38 {
39     delete ui;
40     if (m_pDialog != Q_NULLPTR)
41     {
42         delete m_pDialog;
43         m_pDialog = Q_NULLPTR;
44     }
45 }
46 
47 void Dialog::onPushButton()
48 {
49     int nRet = m_pDialog->exec();
50     if (nRet == QDialog::Accepted)
51     {
52         qDebug() << "Click OK Button";
53         qApp->exit(0);
54     }
55     else if (nRet == QDialog::Rejected)
56     {
57         qDebug() << "Click Cancel Button";
58         return;
59     }
60 }

【4】main

 1 #include "dialog.h"
 2 #include <QApplication>
 3 
 4 int main(int argc, char *argv[])
 5 {
 6     QApplication a(argc, argv);
 7     Dialog w;
 8     w.show();
 9 
10     return a.exec();
11 }

【5】验证一个问题

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