QTableWidget实现行选、列选

r囧r小猫 2022-06-15 10:48 1039阅读 0赞

**行选逻辑：**

1.获取总列数

2.统计该行有哪几列被选中

3.如果被选中数量和总列数一致，则说明该行所有列均已经被选中，则将该列全部复选框去使能，实现反选择即该行全部不选择

4.如果被选中的列数为0或者和总列数不一致，则将没有选中的列复选框使能实现选中，也就是实现该行的所有列都被选中

![Image 1][]![Center][]

**列选逻辑：**同行选逻辑原理一致。

![Image 1][]

![Center 1][]

**设计槽**

在构造函数创建信号

connect(ui->tableWidget->horizontalHeader(), SIGNAL(sectionClicked(int)),this, SLOT(checkColumnSlot(int)));
    connect(ui->tableWidget->verticalHeader(),SIGNAL(sectionClicked(int)),this,SLOT(checkRowSlot(int)));

这里使用到了QTableWidget的两个方法分别是ui->tableWidget->horizontalHeader()，ui->tableWidget->verticalHeader()函数原型如下：

QHeaderView \* QTableView::horizontalHeader() const 返回图表视图的横向表头

QHeaderView \* QTableView::horizontalHeader() const 返回图表视图的竖向表头

这两个函数是QHeaderView类型，触发消息使用的是QHeaderView类中void QHeaderView::sectionClicked(int logicalIndex)信号触发checkColumnSlot(int)或者checkRowSlot(int)槽进行行选或者列选。sectionClicked的作用是当鼠标被按下的时候会触发消息，将行号或者列号的索引值发出，请注意，sectionpressed信号也会一并发出。具体细节可参考QHeaderView类。

测试源码：

//tablewidgetdemo.pro
    #-------------------------------------------------
    #
    # Project created by QtCreator 2017-04-10T14:09:16
    #
    #-------------------------------------------------
    
    QT       += core gui
    
    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
    
    TARGET = tableWidgetDemo
    TEMPLATE = app
    
    
    SOURCES += main.cpp\
            tablewidgetdemo.cpp
    
    HEADERS  += tablewidgetdemo.h
    
    FORMS    += tablewidgetdemo.ui
    
    //tablewidgetdemo.h
    
    #ifndef TABLEWIDGETDEMO_H
    #define TABLEWIDGETDEMO_H
    
    #include <QMainWindow>
    
    namespace Ui {
    class tableWidgetDemo;
    }
    
    class tableWidgetDemo : public QMainWindow
    {
        Q_OBJECT
    
    public:
        explicit tableWidgetDemo(QWidget *parent = 0);
        ~tableWidgetDemo();
    
    private slots:
        void on_printBtn_clicked();
        void checkColumnSlot(int index);
        void checkRowSlot(int row);
    
    private:
        Ui::tableWidgetDemo *ui;
        void initTableWidget();
    };
    
    #endif // TABLEWIDGETDEMO_H
    
    //main.cpp
    #include "tablewidgetdemo.h"
    #include <QApplication>
    
    int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        tableWidgetDemo w;
        w.show();
    
        return a.exec();
    }
    
    //tablewidgetdemo.cpp
    #include "tablewidgetdemo.h"
    #include "ui_tablewidgetdemo.h"
    #include <QDebug>
    
    tableWidgetDemo::tableWidgetDemo(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::tableWidgetDemo)
    {
        ui->setupUi(this);
        this->setWindowTitle("tableWidgetDemo");
        initTableWidget();
        connect(ui->tableWidget->horizontalHeader(), SIGNAL(sectionClicked(int)),this, SLOT(checkColumnSlot(int)));
        connect(ui->tableWidget->verticalHeader(),SIGNAL(sectionClicked(int)),this,SLOT(checkRowSlot(int)));
    
    }
    
    tableWidgetDemo::~tableWidgetDemo()
    {
        delete ui;
    }
    
    void tableWidgetDemo::initTableWidget()
    {
        int row = 4;
        int column = 5;
        ui->tableWidget->clear();
        ui->tableWidget->setRowCount(row);//设置行数
        ui->tableWidget->setColumnCount(column);
        QStringList header;
        header <<"第一列"<<"第二列"<<"第三列"<<"第四列"<<"第五列";
        ui->tableWidget->setHorizontalHeaderLabels(header);
        ui->tableWidget->horizontalHeader()->setStretchLastSection(true);//关键
        ui->tableWidget->setContextMenuPolicy(Qt::CustomContextMenu);
        ui->tableWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        ui->tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);//列等宽
        ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);//禁止编辑
        QString str;
        int i = 0,j = 0;
        for(i = 0;i < row;i++)
        {
            for(j = 0; j < column; j++)
            {
                QTableWidgetItem *checkBox = new QTableWidgetItem();
                checkBox->setCheckState(Qt::Unchecked);
                str.sprintf("行:%d列:%d",i,j);
                checkBox->setText(str.toStdString().c_str());
                ui->tableWidget->setItem(i, j, checkBox);
            }
        }
    }
    
    void tableWidgetDemo::checkRowSlot(int row)
    {
        int column = ui->tableWidget->columnCount();//总列数
        int column_count = 0;//实际选中的行数 + 空行数
        int i = 0;
        for(i = 0;i < column;i++)//统计实际选中的行数
        {
            QTableWidgetItem *item = ui->tableWidget->item(row,i);
            if(!item)
            {
                column_count++;
                continue;
            }
            if(item->checkState() == Qt::Checked)
                column_count++;
        }
    
        if((column - column_count) > 0)//说明没有被完全选中,则置为全选状态
        {
            for(i = 0;i < column;i++)
            {
                QTableWidgetItem *item = ui->tableWidget->item(row,i);
                if(!item)
                    continue;
                if(item->checkState() != Qt::Checked)
                    item->setCheckState(Qt::Checked);
            }
    
        }
        else//说明被完全选中,则置为全未选中选状态
        {
            for(i = 0;i < column;i++)
            {
                QTableWidgetItem *item = ui->tableWidget->item(row,i);
                if(!item)
                    continue;
                if(item->checkState() == Qt::Checked)
                    item->setCheckState(Qt::Unchecked);
            }
        }
    }
    
    void tableWidgetDemo::checkColumnSlot(int column)
    {
        int row = ui->tableWidget->rowCount();//总行数
        int row_count = 0;//实际选中的行数 + 空行数
        int i = 0;
        for(i = 0;i < row;i++)
        {
            QTableWidgetItem *item = ui->tableWidget->item(i,column);
            if(!item)
            {
                row_count++;
                continue;
            }
            if(item->checkState() == Qt::Checked)
                row_count++;
        }
    
        if((row - row_count) > 0)//说明没有被完全选中,则置为全选状态
        {
            for(i = 0;i < row;i++)
            {
                QTableWidgetItem *item = ui->tableWidget->item(i,column);
                if(!item)
                    continue;
                if(item->checkState() != Qt::Checked)
                    item->setCheckState(Qt::Checked);
            }
    
        }
        else//说明被完全选中,则置为全未选中选状态
        {
            for(i = 0;i < row;i++)
            {
                QTableWidgetItem *item = ui->tableWidget->item(i,column);
                if(!item)
                    continue;
                if(item->checkState() == Qt::Checked)
                    item->setCheckState(Qt::Unchecked);
            }
        }
    }
    
    void tableWidgetDemo::on_printBtn_clicked()
    {
        int row = ui->tableWidget->rowCount();//行
        int column = ui->tableWidget->columnCount();//列
    
        int i,j = 0;
        for(i = 0;i < row;i++)
        {
            for(j = 0;j < column;j++)
            {
                QTableWidgetItem *item = ui->tableWidget->item(i,j);
                if(!item)
                    continue;
                if(item->checkState() == Qt::Checked) //选中
                    qDebug()<<item->text();
            }
        }
    }

//tablewidgetdemo.ui

![Image 1][]![Center 2][]

源码下载：

[点击打开链接][Link 1]

[Image 1]: 
[Center]: /images/20220615/a403643b3b8044ca83313bc636f32b3b.png
[Center 1]: /images/20220615/7f553601701f40eea008155cb636dc79.png
[Center 2]: /images/20220615/e368d03cc7c84666b2afdf37f9cd284c.png
[Link 1]: https://download.csdn.net/download/kongshuai19900505/10361104