参考
注意
对于哪里需要用到指针，哪里需要地址还不是很明白，逻辑可以参考
环境
| 环境 | 版本 |
|---|---|
| windows | 10 |
| QT | 6.2.4 |
| Qt Creator | 8.0.1 (Community) |
| qmake |
项目结构
代码思路
mainwindow 调用封装的类的函数，封装的函数处理后会通过发送的信号
通过 connect 方法可以将信号与槽进行连接
- mainwindow.cpp 会调用 showclickitem.cpp 的槽函数
void click();
public slots:
void click();
- showclickitem.cpp 的槽函数处理结束后会发送信号
void onNotice();
signals:
void onNotice();
- 在 mainwindow.cpp 的构造函数中连接 showclickitem.cpp 信号
onNotice(),然后调用 mainwindow.cpp 中的槽函数showKeyContent()
connect(&showClickItem, SIGNAL(onNotice()), this, SLOT(showKeyContent()));
完整代码
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include "showclickitem.h"
#include <QMainWindow>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
public slots:
void on_pushButton_clicked();
void on_listWidget_clicked(const QModelIndex &index);
void showKeyContent();
private:
Ui::MainWindow *ui;
ShowClickItem showClickItem;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QListWidgetItem>
#include <QMouseEvent>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(&showClickItem, SIGNAL(onNotice()), this, SLOT(showKeyContent()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
ui->listWidget->addItem(ui->lineEdit->text());
}
void MainWindow::on_listWidget_clicked(const QModelIndex &index)
{
showClickItem.click();
}
void MainWindow::showKeyContent()
{
QListWidgetItem *item = ui->listWidget->currentItem();
qDebug()<<item->text();
}
mainwindow.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>600</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<widget class="QListWidget" name="listWidget">
<property name="geometry">
<rect>
<x>270</x>
<y>200</y>
<width>256</width>
<height>192</height>
</rect>
</property>
</widget>
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>360</x>
<y>60</y>
<width>80</width>
<height>24</height>
</rect>
</property>
<property name="text">
<string>追加</string>
</property>
</widget>
<widget class="QLineEdit" name="lineEdit">
<property name="geometry">
<rect>
<x>340</x>
<y>110</y>
<width>113</width>
<height>23</height>
</rect>
</property>
</widget>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
showclickitem.h
#ifndef SHOWCLICKITEM_H
#define SHOWCLICKITEM_H
#include <QObject>
class ShowClickItem : public QObject
{
Q_OBJECT
public:
explicit ShowClickItem(QObject *parent = nullptr);
signals:
void onNotice();
public slots:
void click();
};
#endif // SHOWCLICKITEM_H
showclickitem.cpp
#include "showclickitem.h"
#include "QDebug"
ShowClickItem::ShowClickItem(QObject *parent)
: QObject{parent}
{
}
void ShowClickItem::click()
{
qDebug() << "处理结束发送信号";
emit onNotice();
}