今天突然想起在上个公司解决的一个BUG

嵌入式中QTableWidget一般只能看数据不能编辑，或者是选择
所以双击出现空白QTableWidgetItem是不允许的

所说BUG现象

解决

在空白的单元格中，添加不可编辑的QTableWidgetItem

方式1不用遍历，在ItemMaxNum处开始添加
方式2遍历，在空白的单元格处开始添加

方式1

• 主要内容

 //如果QTableWidgetItem个数不是3的倍数，最后一行没有满，布局会自动补充一个空白控件，多次点击才能出现
if(ItemMaxNum%Column!=0&&(i+1)==ItemMaxNum)
{
    // 设置空白项的文本为 ""
    for(int k = (ItemMaxNum%Column); k < table->columnCount(); k++) {
        QTableWidgetItem* item = new QTableWidgetItem("");
        item->setFlags(item->flags() ^ Qt::ItemIsEditable);
        table->setItem(table->rowCount() - 1, k, item);
    }
}

方式2

• 主要内容

if(ItemMaxNum!=Row*Column)
{
    for (int row = 0; row < Row; row++) {
       for (int col = 0; col < Column; ++col) {
           auto item = table->cellWidget(row,col); //灵活变通：table->item(int row, int column)
           if(item==nullptr){
               QTableWidgetItem* items = new QTableWidgetItem("");
               items->setFlags(items->flags() ^ Qt::ItemIsEditable);
               table->setItem(row, col, items);
           }
       }
    }
}

全部内容

#include "testbug.h"
#define Column 3
#define Row 6
#define ItemMaxNum 16
TestBug::TestBug(QWidget *parent)
    : QWidget(parent)
{
    //窗口将始终显示在其他窗口之上
    this->setWindowFlags(Qt::Window | Qt::WindowStaysOnTopHint);
    this->setFixedSize(800,600);
    QTableWidget *table = new QTableWidget;
    table->horizontalHeader()->hide();
    table->verticalHeader()->hide();
    table->horizontalHeader()->setStretchLastSection(true);
    table->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    table->verticalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    table->setFocusPolicy(Qt::NoFocus); // 去除选中虚线
    table->setSelectionMode(QAbstractItemView::NoSelection);
    table->setStyleSheet("QTableWidget{gridline-color:white;background:DeepSkyBlue; border:0px solid #ffffff;border-bottom-width:0px;border-right-width:0px;}");
    table->setColumnCount(Column);
    table->setRowCount(Row);
    table->setShowGrid(false);
    QHBoxLayout *hboxLayout = new QHBoxLayout(this);
    hboxLayout->addWidget(table);

    int row =0,col=0;
    for (int i = 0; i < ItemMaxNum; i++) {
        col = i;
        if (col >= Column)
        {
            if (col % Column == 0)
            {
                row++;
            }
            col %= Column;
        }
        QString style = QString("QPushButton[status=\"1\"]{font-size:28px;background-color:transparent;color:rgb(255,255,255);border-radius:10;border:2px solid white;}"
                                "QPushButton[status=\"2\"]{background-color:rgb(255,255,255);font-size:28px;color:#06411B;border-radius:10;border:2px solid white;}");
        QWidget *pbtnWidget = new QWidget;
        QHBoxLayout *pbtnLayout = new QHBoxLayout;
        QPushButton *pBtn = new QPushButton(QString::fromLocal8Bit("[%1]号").arg(i), pbtnWidget);
        pbtnLayout->addWidget(pBtn);
        pbtnWidget->setLayout(pbtnLayout);
        pBtn->setFixedSize(QSize(185, 50));
        pBtn->setProperty("status", "2");
        pBtn->setStyleSheet(style);
        pBtn->setFocusPolicy(Qt::NoFocus);
        pBtn->setObjectName(QString::number(i));
        table->setCellWidget(row, col, pbtnWidget);
        //如果QTableWidgetItem个数不是3的倍数，最后一行没有满，布局会自动补充一个空白控件，多次点击才能出现
#if 0
        // 方式1
        if(ItemMaxNum%Column!=0&&(i+1)==ItemMaxNum)
        {
            // 设置空白项的文本为 ""
            for(int k = (ItemMaxNum%Column); k < table->columnCount(); k++) {
                QTableWidgetItem* item = new QTableWidgetItem("");
                item->setFlags(item->flags() ^ Qt::ItemIsEditable);
                table->setItem(table->rowCount() - 1, k, item);
            }
        }
#endif
         connect(pBtn, SIGNAL(clicked()), this, SLOT(onBtnClick()));
    }

    //方式2
    if(ItemMaxNum!=Row*Column)
    {
         for (int row = 0; row < Row; row++) {
            for (int col = 0; col < Column; ++col) {
                auto item = table->cellWidget(row,col); //灵活变通：table->item(int row, int column)
                if(item==nullptr){
                    QTableWidgetItem* items = new QTableWidgetItem("");
                    items->setFlags(items->flags() ^ Qt::ItemIsEditable);
                    table->setItem(row, col, items);
                }
            }
         }
    }
}

TestBug::~TestBug()
{
}

void TestBug::onBtnClick()
{
    QPushButton *pBtn = qobject_cast<QPushButton *>(QObject::sender());
    if (pBtn!=nullptr)
    {
         qDebug()<<pBtn->text()<<" ObjectName ="<<pBtn->objectName();
         if (1 == pBtn->property("status").toInt())
            pBtn->setProperty("status", "2");
         else
            pBtn->setProperty("status", "1");
         pBtn->setStyleSheet(pBtn->styleSheet());
    }
}

效果

• QTableWidget双击出现空白QTableWidgetItem不再会出现输入