QTableView 例三（代理）

1、 QComboBox 代理

#pragma once
#include <QStyledItemDelegate>
class MyDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    MyDelegate(QObject *parent = 0);
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                          const QModelIndex &index) const override;
    void setEditorData(QWidget *editor, const QModelIndex &index) const override;
    void setModelData(QWidget *editor, QAbstractItemModel *model,
                      const QModelIndex &index) const override;
    void updateEditorGeometry(QWidget *editor,
        const QStyleOptionViewItem &option, const QModelIndex &index) const override;
};

#include "delegate.h"
#include <QSpinBox>
#include <QComboBox>
MyDelegate::MyDelegate(QObject *parent)
    : QStyledItemDelegate(parent)
{
}
QWidget *MyDelegate::createEditor(QWidget *parent,
    const QStyleOptionViewItem &/* option */,
    const QModelIndex & index ) const
{
    if(index.column() == 6) //在第六列
    {
        QComboBox* box = new QComboBox(parent);
        box->addItems(QStringList()<<"优"<<"良"<<"差");
        return box;
    }
    return NULL;
}
void MyDelegate::setEditorData(QWidget *editor,
                                    const QModelIndex &index) const
{
    QString value = index.model()->data(index, Qt::EditRole).toString();
    QComboBox* box = static_cast<QComboBox*>(editor);
    box->setCurrentText(value);
}
void MyDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                   const QModelIndex &index) const
{
    QComboBox* box = static_cast<QComboBox*>(editor);
    model->setData(index, box->currentText(), Qt::EditRole);
}
void MyDelegate::updateEditorGeometry(QWidget *editor,
    const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
    editor->setGeometry(option.rect);
}

2、QCheckBox代理

#ifndef CHECKDELEGATE_H
#define CHECKDELEGATE_H
#include <QStyledItemDelegate>
class CheckDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    CheckDelegate(QObject *parent = 0);
    const QStyleOptionViewItem &option, const QModelIndex &index) const override;
    bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index);
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
#endif // CHECKDELEGATE_H

#include "checkdelegate.h"
#include <QSpinBox>
#include <QComboBox>
#include <QCheckBox>
#include <QApplication>
#include <QMouseEvent>
#include <QRadioButton>

CheckDelegate::CheckDelegate(QObject *parent)
    : QStyledItemDelegate(parent)
{
}
bool CheckDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
    QRect decorationRect = option.rect;
    QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
    if (event->type() == QEvent::MouseButtonPress && decorationRect.contains(mouseEvent->pos()))
    {
        if (index.column() == 7)
        {
            bool data = model->data(index, Qt::UserRole).toBool();
            model->setData(index, !data, Qt::UserRole);
        }
    }
    return QStyledItemDelegate::editorEvent(event, model, option, index);
}
void CheckDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QStyleOptionViewItem viewOption(option);
    initStyleOption(&viewOption, index);
    if (option.state.testFlag(QStyle::State_HasFocus))
        viewOption.state = viewOption.state ^ QStyle::State_HasFocus;
    QStyledItemDelegate::paint(painter, viewOption, index);
    if (index.column() == 7)
    {
        bool data = index.model()->data(index, Qt::UserRole).toBool();
        QStyleOptionButton checkBoxStyle;
        checkBoxStyle.state = data ? QStyle::State_On : QStyle::State_Off;
        checkBoxStyle.state |= QStyle::State_Enabled;
        checkBoxStyle.iconSize = QSize(20, 20);
        checkBoxStyle.rect = option.rect;
        QCheckBox checkBox;
        QApplication::style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &checkBoxStyle, painter, &checkBox);
    }
}

3、 使用代理

#include <QApplication>
#include <QTableView>
#include <QHeaderView>
#include <QStandardItemModel>
#include <QThread>
#include "delegate.h"
#include "checkdelegate.h"
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    /* 创建表格视图 */
    QTableView *tableView = new QTableView;

    /* 设置表格视图大小 */
    tableView->resize(850, 400);

    /* 创建数据模型 */
    QStandardItemModel* model = new QStandardItemModel();

    /* 设置表格标题行(输入数据为QStringList类型) */
    model->setHorizontalHeaderLabels({"ID", "User Name", "City", "Classify", "Score", "Text","Level","Check"});
    /* 自适应所有列，让它布满空间 */
    tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    MyDelegate* delegate = new MyDelegate;
    tableView->setItemDelegateForColumn(6,delegate);
    CheckDelegate* c = new CheckDelegate;
    tableView->setItemDelegateForColumn(7,c);
    /* 加载共10行数据，并每行有6列数据 */
    for (int i = 0; i < 10; i++) {
        /* 加载第一列(ID)数据 */
        model->setItem(i, 0, new QStandardItem(QString("100%1").arg(i)));
        /* 加载第二列(User Name)数据 */
        model->setItem(i, 1, new QStandardItem(QString("User%1").arg(i)));
        /* 加载第三列(City)数据 */
        model->setItem(i, 2, new QStandardItem("Shanghai"));
        /* 加载第四列(Classify)数据 */
        model->setItem(i, 3, new QStandardItem("Engineer"));
        /* 加载第五列(Score)数据 */
        model->setItem(i, 4, new QStandardItem("80"));
        /* 加载第六列(Sign)数据 */
        model->setItem(i, 5, new QStandardItem("Hello world!"));
        model->setItem(i, 6, new QStandardItem(""));
        QStandardItem *item =  new QStandardItem;
        item->setData(false,1);
        model->setItem(i, 7,item );
    }
    /* 设置表格视图数据 */
    tableView->setModel(model);
    /* 显示 */
    tableView->show();
    return a.exec();
}

4、 效果