QTableView文字换行

使用QStyledItemDelegate代理手动绘制文字

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QStyledItemDelegate>

class QTableView;
class QStandardItemModel;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
private:
    QTableView *mTable = nullptr;
    QStandardItemModel *mModel = nullptr;
};

class MultiLineDelegate: public QStyledItemDelegate
{
    Q_OBJECT
public:
    MultiLineDelegate(QObject *parent = nullptr): QStyledItemDelegate(parent) { }
protected:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include <QApplication>
#include <QTableView>
#include <QStandardItemModel>
#include <QHeaderView>
#include <QPainter>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    mTable = new QTableView(this);
    mModel = new QStandardItemModel(this);
    mTable->setModel(mModel);
    this->setCentralWidget(mTable);
    mTable->setItemDelegateForColumn(4, new MultiLineDelegate);//可设置某行、某列或全部
    QStringList headers;
    headers << "Name" << "Age" << "Gender" << "Email" << "Remark";
    mModel->setHorizontalHeaderLabels(headers);
    mTable->verticalHeader()->setVisible(false);
    mTable->horizontalHeader()->setStretchLastSection(true);
    mModel->setItem(0, 0, new QStandardItem("1"));
    mModel->setItem(0, 1, new QStandardItem("2"));
    mModel->setItem(0, 2, new QStandardItem("3"));
    mModel->setItem(0, 3,new QStandardItem("4"));
    mModel->setItem(0, 4,new QStandardItem(QStringLiteral("白日依山尽，黄河入海流。")));

    resize(800, 600);
}

MainWindow::~MainWindow()
{
}

void MultiLineDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if (!index.isValid()) {
        return;
    }
    QStyleOptionViewItemV4 opt = option;
    initStyleOption(&opt,index);
    QString oldtext = opt.text;
    opt.text = "";
    const QWidget *widget = opt.widget;
    QStyle *style = widget ? widget->style() : QApplication::style();

    QRect txtrect = style->subElementRect(QStyle::SE_ItemViewItemText, &opt, widget);
    // 去除选择时的虚线框
    if (opt.state & QStyle::State_HasFocus) {
        opt.state = opt.state ^ QStyle::State_HasFocus;
    }
    // 选中文字颜色不变
    // opt.palette.setColor(QPalette::HighlightedText, index.data(Qt::ForegroundRole).value<QColor>());

    style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, widget);
    QRect boundingRect;
    painter->save();
    painter->setPen(opt.palette.color(QPalette::Text));
    if (opt.state & QStyle::State_Selected) {
        painter->setPen(opt.palette.color(QPalette::HighlightedText));
    }
    painter->drawText(txtrect, Qt::TextWordWrap|Qt::AlignVCenter, oldtext, &boundingRect);
    painter->restore();
}

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