Qt自定义表格TableWidget实现整行单列按键逐行切换及跳转首尾-示例代码

CommonData.h

#ifndef COMMONDATA_H
#define COMMONDATA_H

enum class PressKeyType{
   
    UP,
    DOWM,
    LEFT,//向前翻页至第一页
    RIGHT//向后翻页至最后一页
};

#endif // COMMONDATA_H

customtablewidget.h

#ifndef CUSTOMTABLEWIDGET_H
#define CUSTOMTABLEWIDGET_H

#include "CommonData.h"
#include <QTableWidget>


class CustomTableWidget : public QTableWidget
{
   
    Q_OBJECT
public:
    CustomTableWidget(QWidget *parent = nullptr);
protected:
    void keyPressEvent(QKeyEvent *event) override;
    void paintEvent(QPaintEvent *) override;
signals:
    void signUpdateClass(const int& index,const PressKeyType &pressType);
};

#endif // CUSTOMTABLEWIDGET_H

customtablewidget.cpp

#include "customtablewidget.h"

#include <QKeyEvent>
#include <QPainter>

CustomTableWidget::CustomTableWidget(QWidget *parent):QTableWidget(parent)
{
   

}

void CustomTableWidget::keyPressEvent(QKeyEvent *event)
{
   
    int nCurRow = currentRow();
    int nCurCol = currentColumn();
    if(event->key() == Qt::Key_Up){
   
        if(nCurRow != 0){
   
            currentItem()->setBackgroundColor(Qt::transparent);
            nCurRow -= 1;
            setCurrentCell(nCurRow,nCurCol);
            emit signUpdateClass(nCurRow,PressKeyType::UP);
        }
    }else if(event->key() == Qt::Key_Down){
   
        if(nCurRow != rowCount() -1){
   
            currentItem()->setBackgroundColor(Qt::transparent);
            nCurRow += 1;
            setCurrentCell(nCurRow,nCurCol);
            emit signUpdateClass(nCurRow,PressKeyType::DOWM);
        }
    }else if(event->key() == Qt::Key_Left){
   
        currentItem()->setBackgroundColor(Qt::transparent);
        setCurrentCell(0,0);
        emit signUpdateClass(0,PressKeyType::LEFT);
    }else if(event->key() == Qt::Key_Right){
   
        currentItem()->setBackgroundColor(Qt::transparent);
        setCurrentCell(rowCount()-1,0);
        emit signUpdateClass(rowCount()-1,PressKeyType::RIGHT);
    }else{
   
        QTableWidget::keyPressEvent(event);
    }
}

void CustomTableWidget::paintEvent(QPaintEvent *event)
{
   
    Q_UNUSED(event);

    //设置选中项的背景色
    QTableWidgetItem *newItem = this->currentItem();
    if (newItem) {
   
        newItem->setBackground(QBrush(Qt::blue));
    }

    QTableWidget::paintEvent(event);
}

dowmarrowlabel.h

#ifndef DOWNARROWLABEL_H
#define DOWNARROWLABEL_H

#include <QLabel>


class DownArrowLabel:public QLabel
{
   
public:
    DownArrowLabel(QWidget* parent = nullptr);
protected:
    void paintEvent(QPaintEvent *) override;
};

#endif // DOWNARROWLABEL_H

dowmarrowlabel.cpp

#include "downarrowlabel.h"

#include <QPainter>
#include <QtMath>//qSqrt()

DownArrowLabel::DownArrowLabel(QWidget *parent):QLabel(parent)
{
   
    setFixedSize(20,20);
}

void DownArrowLabel::paintEvent(QPaintEvent *event)
{
   
    QLabel::paintEvent(event); // 调用基类的paintEvent进行常规绘制（如果有的话）

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing); // 抗锯齿

    // 设置画笔和画刷
    painter.setPen(Qt::NoPen); // 无边框
    painter.setBrush(Qt::yellow); // 黄色填充

    // 确定等边三角形的边长