QSignalMapper 信号转发器的使用

最新推荐文章于 2021-01-08 22:13:09 发布

司马香炉

最新推荐文章于 2021-01-08 22:13:09 发布

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分类专栏： Qt串口文章标签： QSignalMapper 信号转发器的使用

本文链接：https://blog.youkuaiyun.com/weixin_42692504/article/details/101775756

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本文深入讲解了QSignalMapper在Qt中的应用，展示了如何通过信号转发器简化信号与槽的连接，实现按钮点击事件统一处理，有效减少代码重复，提高开发效率。

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QSignalMapper 是一种信号转发器，可以用于类似信号的转发处理，不如什么案件的触发，不用血多次，只用写一次信号就可以。
比如下面简单的键盘
直接代码
ui 界面
在这里插入图片描述
.h界面

#include <QMainWindow>
#include <QSignalMapper>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void setText(const QString& text);
    void on_pushButton_12_clicked();

private:
    void setMapper();    //设置转发
    void connectMapper();   //连接转发器

private:
    Ui::MainWindow *ui;
    QSignalMapper *signalMapper;    //信号转发器

.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->lineEdit->setFocus();   //获得焦点
    signalMapper=new QSignalMapper(this);     //信号转换器  创建
    setMapper();       //信号转换器  设置
    connectMapper();       //信号转换器  连接

    //信号转换器和设置文字绑定
    connect(signalMapper,SIGNAL(mapped(const QString&)),this,SLOT(setText(const QString&)));
}

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

void MainWindow::setText(const QString& text)
{
    ui->lineEdit->insert(text);
}

void MainWindow::setMapper()
{
    signalMapper->setMapping(ui->pushButton,ui->pushButton->text());
    signalMapper->setMapping(ui->pushButton_2,ui->pushButton_2->text());
    signalMapper->setMapping(ui->pushButton_3,ui->pushButton_3->text());
    signalMapper->setMapping(ui->pushButton_4,ui->pushButton_4->text());
    signalMapper->setMapping(ui->pushButton_5,ui->pushButton_5->text());
    signalMapper->setMapping(ui->pushButton_6,ui->pushButton_6->text());
    signalMapper->setMapping(ui->pushButton_7,ui->pushButton_7->text());
    signalMapper->setMapping(ui->pushButton_8,ui->pushButton_8->text());
    signalMapper->setMapping(ui->pushButton_9,ui->pushButton_9->text());
    signalMapper->setMapping(ui->pushButton_10,ui->pushButton_10->text());
    signalMapper->setMapping(ui->pushButton_11,ui->pushButton_11->text());
}

void MainWindow::connectMapper()
{
    connect(ui->pushButton,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_2,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_3,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_4,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_5,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_6,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_7,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_8,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_9,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_10,SIGNAL(clicked()),signalMapper,SLOT(map()));
    connect(ui->pushButton_11,SIGNAL(clicked()),signalMapper,SLOT(map()));
}
//清空显示框
void MainWindow::on_pushButton_12_clicked()
{
    ui->lineEdit->clear();
}

运行界面
![在这里插入图片描述](https://img-blog.csdnimg.cn/20190930154651137.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjY5MjUwNA==,size_16,color_FFFFFF,t_70)