自定义代理编辑控件是在tableView单元格中，呈现编辑辅助的Combox控件

自定义代理编辑控件类TComboBoxDelegate的定义过程

重写自定义代理编辑组件类的四个方法：  创建编辑组件、模型赋值给代理编辑组件、代理编辑组件数据到模型、更新位置

.h

 

#ifndef TCOMBOBOXDELEGATE_H
#define TCOMBOBOXDELEGATE_H#include <QObject>
#include <QStyledItemDelegate>class TComboBoxDelegate : public QStyledItemDelegate
{Q_OBJECT
private:QStringList m_itemList;bool m_editable;
public:explicit TComboBoxDelegate(QObject *parent = nullptr);void setItems(QStringList items,bool editable);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;void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;};#endif // TCOMBOBOXDELEGATE_H

.cpp

 

#include "tcomboboxdelegate.h"
#include <QComboBox>TComboBoxDelegate::TComboBoxDelegate(QObject *parent): QStyledItemDelegate{parent}
{}void TComboBoxDelegate::setItems(QStringList items, bool editable)
{m_itemList= items;m_editable = editable;
}QWidget* TComboBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{Q_UNUSED(option);Q_UNUSED(index);//不需要 option 和index 参数QComboBox *editor = new QComboBox(parent);editor->setEditable(m_editable);for(int i=0;i<m_itemList.count();i++){editor->addItem(m_itemList.at(i));}return editor;
}void TComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{QString str= index.model()->data(index,Qt::EditRole).toSize();QComboBox *combo = static_cast<QComboBox *>editor;combo->setCurrentText(str);
}void TComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{QComboBox *combo = static_cast<QComboBox *>editor;QString str = combo->currentText();model->setData(index,str,Qt::EditRole);
}void TComboBoxDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{Q_UNUSED(index)editor->setGeometry(option.rect);
}

TComBoxDelegate自定义编辑控件

总结

1. 统一继承自 QStyledItemDelegate

2. 根据Combox的特性，需要自定义QStringList ，是否可编辑