QTableView使用代理向表格中添加控件

一、效果展示

二、繼承QItemDelegate實作自己的代理類

主要是重寫如下三個函數：

QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                                        const QModelIndex &index) const;
void setEditorData(QWidget *editor, const QModelIndex &index) const;
void setModelData(QWidget *editor, QAbstractItemModel *model,
                                    const QModelIndex &index) const;      

Delegate.h

#ifndef DELEGATE_H
#define DELEGATE_H

#include <QStyledItemDelegate>
#include <QItemDelegate>
#include <QModelIndex>
#include <QPainter>
#include <QWidget>

#define  COMBOXCOL 1
class Delegate : public QItemDelegate
{
    Q_OBJECT

public:
    Delegate(QObject *parent = nullptr);
    ~Delegate();

    void paint(QPainter *painter, const QStyleOptionViewItem &option,
                    const QModelIndex &index) const;
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;

    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                                        const QModelIndex &index) const;
    void setEditorData(QWidget *editor, const QModelIndex &index) const;
    void setModelData(QWidget *editor, QAbstractItemModel *model,
                                    const QModelIndex &index) const;

};

#endif // DELEGATE_H      

#include "combobox_itemdelegate.h"
#include <QComboBox>

Delegate::Delegate(QObject *parent)
    : QItemDelegate(parent)
{

}

Delegate::~Delegate()
{

}
void Delegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
    const QModelIndex &index) const
{
    QItemDelegate::paint(painter, option, index);
}

QSize Delegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    return QItemDelegate::sizeHint(option, index);
}

QWidget *Delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                                                   const QModelIndex &index) const
{
    if (index.isValid() && index.column() == COMBOXCOL)
    {
        QComboBox *editor = new QComboBox(parent);
        editor->setEditable(true);
        editor->installEventFilter(const_cast<Delegate *>(this));
        return editor;
    }
    else
    {
        return QItemDelegate::createEditor(parent, option, index);
    }
}

void Delegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
    if (index.isValid() && index.column() == COMBOXCOL)
    {
        QString value = index.model()->data(index, Qt::DisplayRole).toString();
        QComboBox *combox = static_cast<QComboBox *>(editor);
        combox->addItem("男");
        combox->addItem("女");
        combox->setCurrentText(value);
    }
    else
    {
        QItemDelegate::setEditorData(editor, index);
    }
}

void Delegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                             const QModelIndex &index) const
{
    if (index.isValid() && index.column() == COMBOXCOL)
    {
        QComboBox *combox = static_cast<QComboBox *>(editor);
        model->setData(index, combox->currentText());
    }
    else
    {
        QItemDelegate::setModelData(editor, model, index);
    }
}      

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    tableview = new QTableView(this->centralWidget());
    tableview->resize(500,500);
    tableviewModel = new QStandardItemModel;
    tableview->setModel(tableviewModel);
    QStringList headerList;
    headerList<<"姓名"<<"性别"<<"年齡";
    tableviewModel->setHorizontalHeaderLabels(headerList);
    tableviewModel->setItem(0,0,new QStandardItem("張三"));
    tableviewModel->setItem(1,0,new QStandardItem("李四"));
    tableviewModel->setItem(2,0,new QStandardItem("王二"));

    tableview->setSelectionBehavior(QAbstractItemView::SelectRows);//選擇一行
    tableview->setItemDelegateForColumn(1, new Delegate(this));//添加QCombox代理
}      

m_button = new QPushButton("Download");
//觸發下載下傳按鈕的槽函數
connect(m_button, SIGNAL(clicked(bool)), this, SLOT(ClickDownloadButton())); 
m_button->setProperty("row", i);  //為按鈕設定row屬性
m_button->setProperty("fileName", fileInfo.at(i).fileName);  //為按鈕設定fileName屬性
//m_button->setProperty("column", col)
ui->downloadTable->setIndexWidget(model->index(model->rowCount() - 1, 3), m_button);