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(
         , 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()/;
         y = option.rect.top() + ;
         width = ;
         height = ;
         button->rect = option.rect.adjusted(, , -, -) /*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() / ;
     y = option.rect.top() + ;
     width = ;
     height = ;

     QRect btnRect(x, y, width, height);

     if (event->type() == QEvent::MouseButtonPress) {

         QMouseEvent* e = (QMouseEvent*)event;

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

             QDialog *d = new QDialog();

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

 ///////////////////////Usage//////////////////////////
  ui->appTable->setItemDelegateForColumn(
         , 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