qt-C++笔记之两个窗口ui的交互

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0.运行

1.文件结构

2.先创建widget项目，搞一个窗口ui出来

3.项目添加第二个widget窗口出来

4.补充代码

4.1.qt_widget_interaction.pro

代码

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked 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 it uses 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 6.0.0

SOURCES += \
    main.cpp \
    second_widget.cpp \
    widget.cpp

HEADERS += \
    second_widget.h \
    widget.h

FORMS += \
    second_widget.ui \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

4.2.main.cpp

代码

#include "widget.h"

#include <QApplication>

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

4.3.widget.h

代码

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <second_widget.h>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_push_second_widget_clicked();
    void show_widget();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

4.4.widget.cpp

代码

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

}

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

void Widget::show_widget()
{
    this->show();
}

void Widget::on_push_second_widget_clicked()
{
    second_widget* f = new second_widget;
    f->show();
    this->hide();

    connect(f,SIGNAL(close_and_open()),this,SLOT(show_widget()));
}

4.5.second_widget.h

代码

#ifndef SECOND_WIDGET_H
#define SECOND_WIDGET_H

#include <QWidget>

namespace Ui {
class second_widget;
}

class second_widget : public QWidget
{
    Q_OBJECT

public:
    explicit second_widget(QWidget *parent = nullptr);
    ~second_widget();

private slots:
    void on_pushButton_clicked();

signals:
    void close_and_open();

private:
    Ui::second_widget *ui;
};

#endif // SECOND_WIDGET_H

4.6.second_widget.cpp

代码

#include "second_widget.h"
#include "ui_second_widget.h"

second_widget::second_widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::second_widget)
{
    ui->setupUi(this);
}

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

void second_widget::on_pushButton_clicked()
{
    emit close_and_open();
    this->hide();
}

4.7.widget.ui

代码

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Widget</class>
 <widget class="QWidget" name="Widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Widget</string>
  </property>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>350</x>
     <y>210</y>
     <width>171</width>
     <height>41</height>
    </rect>
   </property>
   <property name="text">
    <string>first_widget</string>
   </property>
  </widget>
  <widget class="QPushButton" name="push_second_widget">
   <property name="geometry">
    <rect>
     <x>70</x>
     <y>340</y>
     <width>281</width>
     <height>51</height>
    </rect>
   </property>
   <property name="text">
    <string>open scond_widget</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

4.8.second_widget.ui

代码

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>second_widget</class>
 <widget class="QWidget" name="second_widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>460</width>
    <height>312</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>100</x>
     <y>120</y>
     <width>211</width>
     <height>41</height>
    </rect>
   </property>
   <property name="text">
    <string>second_widget</string>
   </property>
  </widget>
  <widget class="QPushButton" name="pushButton">
   <property name="geometry">
    <rect>
     <x>20</x>
     <y>210</y>
     <width>411</width>
     <height>41</height>
    </rect>
   </property>
   <property name="text">
    <string>close_second_and_open_first</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>