Qt中的QTableView 中的列放入Widget

QTableView是Qt中Model View理念的框架，View只展现数据，所以通过互交修改编辑数据，需要用到委托这个概念Delegate。

所以基本思路是继承QItemDelegate这个类，然后overried里面的方法，然后通过QTableView的成员函数setItemDelegateForColumn就可以了。

以下代码是在某列中添加QComboBox：

///////////////////////////EmployeePrivilegeComboxEditor.h///////////
#include <QItemDelegate>
#include <QStringList>

class EmployeePrivilegeComboxEditor : public QItemDelegate {
    Q_OBJECT

public:
    explicit EmployeePrivilegeComboxEditor(QObject* parent = Q_NULLPTR);
    ~EmployeePrivilegeComboxEditor();

public:
    virtual QWidget* createEditor(QWidget* parent,
        const QStyleOptionViewItem& option,
        const QModelIndex& index) const override;

    virtual void setEditorData(
        QWidget* editor, const QModelIndex& index) const override;

    virtual void setModelData(QWidget* editor, QAbstractItemModel* model,
        const QModelIndex& index) const override;

private:
    QStringList items_;
};

///////////////////////////EmployeePrivilegeComboxEditor.cpp///////////

#include "EmployeePrivilegeComboxEditor.h"

#include <QComboBox>

EmployeePrivilegeComboxEditor::EmployeePrivilegeComboxEditor(QObject* parent)
    : QItemDelegate(parent)
{
    items_ << QStringLiteral("普通用户") << QStringLiteral("管理员")
           << QStringLiteral("超级管理员");
}

EmployeePrivilegeComboxEditor::~EmployeePrivilegeComboxEditor() {}

QWidget* EmployeePrivilegeComboxEditor::createEditor(QWidget* parent,
    const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    QComboBox* editor = new QComboBox(parent);
    editor->addItems(items_);
    return editor;
}

void EmployeePrivilegeComboxEditor::setEditorData(
    QWidget* editor, const QModelIndex& index) const
{
    QString text        = index.model()->data(index, Qt::EditRole).toString();
    QComboBox* comboBox = dynamic_cast<QComboBox*>(editor);
    if (comboBox) {
        int tindex = comboBox->findText(text);
        comboBox->setCurrentIndex(tindex);
    }
}

void EmployeePrivilegeComboxEditor::setModelData(
    QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
{
    QComboBox* comboBox = dynamic_cast<QComboBox*>(editor);
    if (comboBox) {
        QString text = comboBox->currentText();
        model->setData(index, text, Qt::EditRole);
    }
}

//////////////////////////Usage///////////////////////////
ui->employeeTable->setItemDelegateForColumn(
        3, new EmployeePrivilegeComboxEditor(this)); 

以下代码是在单元格列中放置QPushButton:

///////////////////////DownloadUpdateButton.h//////////////////////
#pragma once

#include <QItemDelegate>
#include <QString>
#include <QMap>

class QStyleOptionButton;

class DownloadUpdateButton : public QItemDelegate
{
    Q_OBJECT

public:
    explicit DownloadUpdateButton(QObject *parent = Q_NULLPTR);
    ~DownloadUpdateButton();
public:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, 
        const QModelIndex &index) const override;
    bool editorEvent(QEvent *event, QAbstractItemModel *model, 
        const QStyleOptionViewItem &option, const QModelIndex &index) override;
private slots:
   
private:
    QString downloadStyle_;
    QString updateStyle_;
private:
    QMap<QModelIndex, QStyleOptionButton*> m_btns;
};

///////////////////DownloadUpdateButton.cpp///////////////////////////

#include "DownloadUpdateButton.h"

#include <QStyleOptionButton>
#include <QMessageBox>
#include <QPainter>
#include <QApplication>
#include <QDesktopWidget>
#include <QMouseEvent>

DownloadUpdateButton::DownloadUpdateButton(QObject *parent)
    : QItemDelegate(parent)
{
    downloadStyle_ = "";
    updateStyle_ = "";
  
}

DownloadUpdateButton::~DownloadUpdateButton()
{
}

void DownloadUpdateButton::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QStyleOptionButton* button = m_btns.value(index);
    if (!button) {
        button = new QStyleOptionButton();
        int x, y, width, height;
        x = option.rect.left() + option.rect.width()/2;
        y = option.rect.top() + 5;
        width = 20;
        height = 20;
        button->rect = option.rect.adjusted(4, 4, -4, -4) /*QRect(x,y,width,height)*/;
        button->text = "X";
        button->state |= QStyle::State_Enabled;

        (const_cast<DownloadUpdateButton *>(this))->m_btns.insert(index, button);
    }
    painter->save();

    if (option.state & QStyle::State_Selected) {
        painter->fillRect(option.rect, option.palette.highlight());

    }
    painter->restore();
    QApplication::style()->drawControl(QStyle::CE_PushButton, button, painter);
}

bool DownloadUpdateButton::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
    int x, y, width, height;
    x = option.rect.left() + option.rect.width() / 2;
    y = option.rect.top() + 5;
    width = 20;
    height = 20;

    QRect btnRect(x, y, width, height);
    
    if (event->type() == QEvent::MouseButtonPress) {

        QMouseEvent* e = (QMouseEvent*)event;

        if (option.rect.adjusted(4, 4, -4, -4)/*(btnRect*/.contains(e->x(), e->y()) && m_btns.contains(index)) {
            m_btns.value(index)->state |= QStyle::State_Sunken;
        }
    }
    if (event->type() == QEvent::MouseButtonRelease) {
        QMouseEvent* e = (QMouseEvent*)event;

        if (option.rect.adjusted(4, 4, -4, -4)/*btnRect*/.contains(e->x(), e->y()) && m_btns.contains(index)) {
            m_btns.value(index)->state &= (~QStyle::State_Sunken);

            QDialog *d = new QDialog();

            d->setGeometry(0, 0, 200, 200);
            d->move(QApplication::desktop()->screenGeometry().center() - d->rect().center());
            d->show();
        }
    }
    return true;
}

///////////////////////Usage//////////////////////////
 ui->appTable->setItemDelegateForColumn(
        5, new DownloadUpdateButton(this)); //给第5列添加一个按钮

rerferences:

https://www.cnblogs.com/li-peng/p/3961843.html

https://www.cnblogs.com/li-peng/p/4029885.html

http://www.qtcn.org/bbs/simple/?t60567.html

https://stackoverflow.com/questions/11777637/adding-button-to-qtableview