實例QT程序 —— QTableWidget 表格添加/刪除單元格控件

目錄

1.簡介
2.效果圖
3.重點講解
4.源碼

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1.簡介

本文主要介紹瞭如何在QTableWidget表格的單元格中添加和刪除控件，內容包含動態效果圖、重點講解和源碼，讀者們可以方便查看學習和交流。


回目錄

2.效果圖

運行效果圖

回目錄

3.重點講解

1） 通過以下語句，我們可以在指定單元格中設置我們期望的控件（如示例中的勾選框、下拉框、按鈕、旋鈕框等）；

       ui->tableWidget->setCellWidget(row, col, wdgAdd);

２）單元格中刪除控件的語句如下：

         ui->tableWidget->removeCellWidget(row, col);

從下面的代碼片段及實際運行打印信息發現，以上remove僅僅是把控件從單元格中移除，但是並未delete釋放掉，需要主動釋放避免內存泄漏，大家使用中請注意該問題；

       QWidget *wdgPre = ui->tableWidget->cellWidget(row, col);    //之前的控件
       QString strMsg = tabPosInfo;
       if( nullptr != wdgPre ){
           qDebug() << "removeCellWidget at(" << row << "," << col << ")";
           ui->tableWidget->removeCellWidget(row, col);
           QString objN = wdgPre->objectName();
           delete wdgPre;
           wdgPre = nullptr;
           strMsg += QString("移除控件\"%1\",").arg(objN);
       }

       ui->tableWidget->setCellWidget(row, col, wdgAdd);
       strMsg += QString("添加控件\"%1\"").arg(txt);
       ui->plainTextEdit->appendPlainText(strMsg);

打印信息截圖：

回目錄

4.源碼

• widget.h
• widget.cpp

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

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

    enum CellWidgetType {
        CWT_CheckBox,   // 勾選框
        CWT_SpinBox,   // 旋鈕
        CWT_PushButton,   // 按鈕
        CWT_ComboBox,   // 下拉框
    };

private slots:
    void on_btnAddCellWdg_clicked();

    void on_tableWidget_cellClicked(int row, int column);

private:
    void initData();    // 初始化數據
    void initForm();    //　初始化窗體

private:
    Ui::Widget *ui;

    QHash<int, QString> m_hashIdxType;  // <索引, 控件名稱>
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QCheckBox>
#include <QPushButton>
#include <QComboBox>
#include <QSpinBox>
#include <QDebug>

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

    initData();
    initForm();
}

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

void Widget::initData()
{
    m_hashIdxType.insert(CWT_CheckBox, "勾選框");
    m_hashIdxType.insert(CWT_SpinBox, "旋鈕");
    m_hashIdxType.insert(CWT_PushButton, "按鈕");
    m_hashIdxType.insert(CWT_ComboBox, "下拉框");
}

void Widget::initForm()
{
    {
        int count = 3;
        QString strPre("列");
        QStringList headerLabs;
        for(int i=0; i<count; i++){
            QString lab = strPre + QString::number(i+1);
            headerLabs.append(lab);
        }
        ui->tableWidget->setColumnCount(count);
        ui->tableWidget->setHorizontalHeaderLabels(headerLabs);
        ui->spinBoxCol->setRange(1, count);
    }
    {
        int count = 10;
        QString strPre("行");
        QStringList headerLabs;
        for(int i=0; i<count; i++){
            QString lab = strPre + QString::number(i+1);
            headerLabs.append(lab);
        }
        ui->tableWidget->setRowCount(count);
        ui->tableWidget->setVerticalHeaderLabels(headerLabs);
        ui->spinBoxRow->setRange(1, count);
    }

    QStringList listType = m_hashIdxType.values();
    ui->comboBox->addItems(listType);
}

void Widget::on_btnAddCellWdg_clicked()
{
    int row = ui->spinBoxRow->value();
    int col = ui->spinBoxCol->value();
    QString tabPosInfo = QString("單元格(行%1列%2)").arg(row).arg(col);
    QString tabPos = QString("%1%2").arg(row).arg(col);
    QString strTypeName = ui->comboBox->currentText();
    int curIdx = m_hashIdxType.key(strTypeName);
    QString txt = strTypeName + tabPos;
    QWidget *wdgAdd = nullptr;
    switch (curIdx) {
    case CWT_CheckBox:{
        QCheckBox *chkBox = new QCheckBox(txt);
        chkBox->setChecked(true);
        wdgAdd = chkBox;
        break;
    }
    case CWT_SpinBox:{
        QSpinBox *spinBox = new QSpinBox;
        QString strVal = QString("%1%2").arg(row).arg(col);
        spinBox->setValue(strVal.toInt());
        wdgAdd = spinBox;
        break;
    }
    case CWT_PushButton:{
        wdgAdd = new QPushButton(txt);
        break;
    }
    case CWT_ComboBox:{
        QComboBox *cBox = new QComboBox;
        cBox->addItem(txt);
        wdgAdd = cBox;
        break;
    }
    default:
        break;
    }

    if( nullptr != wdgAdd ){
        row--;  // 轉換爲tab中真實的行
        col--;  // 轉換爲tab中真實的列
        wdgAdd->setObjectName(txt);
        QWidget *wdgPre = ui->tableWidget->cellWidget(row, col);    //之前的控件
        QString strMsg = tabPosInfo;
        if( nullptr != wdgPre ){
            qDebug() << "removeCellWidget at(" << row << "," << col << ")";
            ui->tableWidget->removeCellWidget(row, col);
            QString objN = wdgPre->objectName();
            delete wdgPre;
            wdgPre = nullptr;
            strMsg += QString("移除控件\"%1\",").arg(objN);
        }

        ui->tableWidget->setCellWidget(row, col, wdgAdd);
        strMsg += QString("添加控件\"%1\"").arg(txt);
        ui->plainTextEdit->appendPlainText(strMsg);
    }
}

void Widget::on_tableWidget_cellClicked(int row, int column)
{
    ui->spinBoxCol->setValue(column+1);
    ui->spinBoxRow->setValue(row+1);
}

回目錄

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加油，向未來！GO~
Come on！

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