概述

所里项目需要写关于Qt表的的东西，主要的东西有合并表头（包括列表头），百度里全都是一些关于QTableWidget的介绍及表格内容的操作啥的（Google里能还能找到几个有用的），关于表头的修改却少之又少，但是还是有两种方法来处理，虽然说是处理不如果说是相关介绍，代码都不知道在哪copy过来的，请问同学们，你们的代码能跑一下么？就算能跑不能分享一下么、、截个代码片段是什么意思。。。不够意思！！！

一、效果展示

1. 普通合并表头
   
2. 多级合并表头
   
3. 右键菜单添加与删除及表格下拉联动
   

二、demo 下载链接

qt_demo.zip

三、定制表头

重中之重就是HeaderView，麻烦也在它，重写封装好的RTableHeaderView类已放到demo内。

1. 重写HeaderView (概述)

RTableHeaderView继承的QHeaderView, 添加setRowHeight、setColumnWidth、setSpan、setCellBackgroundColor、setCellForegroundColor这几个函数

class MultistageTableHeaderAPI RTableHeaderView : public QHeaderView
{
    Q_OBJECT
public:
    RTableHeaderView(Qt::Orientation orientation,int rows,int columns,QWidget* parent = 0);
    virtual ~RTableHeaderView();

    void setRowHeight(int row, int rowHeight);
    void setColumnWidth(int col, int colWidth);
    void setSpan(int row, int column, int rowSpanCount, int columnSpanCount);
    void setCellBackgroundColor(const QModelIndex& index, const QColor&);
    void setCellForegroundColor(const QModelIndex& index, const QColor&);


protected:
    // override
    virtual void mousePressEvent(QMouseEvent* event) Q_DECL_OVERRIDE;
    virtual QModelIndex indexAt(const QPoint&);
    virtual void paintSection(QPainter* painter, const QRect& rect, int logicalIndex) const Q_DECL_OVERRIDE;
    virtual QSize sectionSizeFromContents(int logicalIndex) const Q_DECL_OVERRIDE;

    // inherent features
    QModelIndex columnSpanIndex(const QModelIndex& currentIndex) const;
    QModelIndex rowSpanIndex(const QModelIndex& currentIndex) const;
    int columnSpanSize(int row, int from, int spanCount) const;
    int rowSpanSize(int column, int from, int spanCount) const;
    int getSectionRange(QModelIndex& index, int* beginSection, int* endSection) const;

protected slots:
    void onSectionResized(int logicalIdx, int oldSize, int newSize);

signals:
    void sectionPressed(int from, int to);
};

2. 定制列表头(概述)

    // 横向表头
    RTableHeaderView* p_header = new RTableHeaderView(Qt::Horizontal, 2, 15, ui->tableWidget);
    QAbstractItemModel* pHeaderModel = p_header->model();
    // 合并表头
    p_header->setSpan(0, 0, 2, 1);
    p_header->setSpan(0, 1, 2, 1);
    p_header->setSpan(0, 2, 1, 13);
    // 设置表头标题内容
    pHeaderModel->setData(pHeaderModel->index(0, 0), QString("Reference"), Qt::DisplayRole);
    pHeaderModel->setData(pHeaderModel->index(0, 1), QString("Action"), Qt::DisplayRole);
    pHeaderModel->setData(pHeaderModel->index(0, 2), QString("Params"), Qt::DisplayRole);
    for (int i = 0; i < 13; i++)
    {
        pHeaderModel->setData(pHeaderModel->index(1, i+2), QString("param_%1").arg(i), Qt::DisplayRole);
    }
    
    // 设置禁止点击
    p_header->setSectionsClickable(false);
    // 设置表头颜色
    p_header->setCellBackgroundColor(pHeaderModel->index(0, 0), 0xcfcfcf);
    p_header->setCellBackgroundColor(pHeaderModel->index(0, 1), 0xcfcfcf);
    p_header->setCellBackgroundColor(pHeaderModel->index(0, 2), 0xcfcfcf);

3. 定制行表头(概述)

    // 纵向表头
    RTableHeaderView* p_vertical = new RTableHeaderView(Qt::Vertical, 6, 2, ui->tableWidget);
    QAbstractItemModel* pVerticalModel = p_vertical->model();
    // 合并表头
    p_vertical->setSpan(0, 0, 2, 2);
    p_vertical->setSpan(2, 0, 2, 1);
    p_vertical->setSpan(4, 0, 2, 1);
    // 设置表头标题内容
    pVerticalModel->setData(pVerticalModel->index(0,0), QString("0"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(2,0), QString("1"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(4,0), QString("2"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(0,1), QString("name"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(1,1), QString("value"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(2,1), QString("name"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(3,1), QString("value"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(4,1), QString("name"), Qt::DisplayRole);
    pVerticalModel->setData(pVerticalModel->index(5,1), QString("value"), Qt::DisplayRole);
    // 设置禁止点击
    p_vertical->setSectionsClickable(false);
    // 设置表头颜色
    p_vertical->setCellBackgroundColor(pHeaderModel->index(0,0), 0xcfcfcf);

四、右键菜单

在table中连接菜单槽函数

connect(ui->tableWidget, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(slotContextMenu(QPoint)));

    QMenu *menu = new QMenu(ui->tableWidget);
    QAction *menu1 = new QAction(QString("添加"));
    QAction *separator = new QAction();
    separator->setSeparator(true);
    QAction *menu2 = new QAction(QString("删除"));
    connect(menu1, SIGNAL(triggered()), this, SLOT(menu_add()));
    connect(menu2, SIGNAL(triggered()), this, SLOT(menu_delete()));
    menu->addAction(menu1);
    menu->addAction(separator);
    menu->addAction(menu2);
    menu->move(QCursor::pos());
    menu->show();