55 为“性别”列添加自定义代理类

第三步，将“性别”列数据的代理（编辑器）由默认的单行文本编辑框（QLineEdit）替换为组合框（QComboBox）。

55.1 定义组合框代理类

C:\Users\Minwei\Projects\Qt\Table\comboboxdelegate.h：

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#ifndef COMBOBOXDELEGATE_H
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#define COMBOBOXDELEGATE_H
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#include <QStyledItemDelegate>
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#include <QComboBox>
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class ComboBoxDelegate : public QStyledItemDelegate
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{
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public:
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    ComboBoxDelegate();
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protected:
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    QWidget* createEditor(QWidget* parent,
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        QStyleOptionViewItem const& option, QModelIndex const& index) const;
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    void setEditorData(QWidget* editor,
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        QModelIndex const& index) const;
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    void setModelData(QWidget* editor,
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        QAbstractItemModel* model, QModelIndex const& index) const;
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    void updateEditorGeometry(QWidget* editor,
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        QStyleOptionViewItem const& option, QModelIndex const& index) const;
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};
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#endif // COMBOBOXDELEGATE_H

C:\Users\Minwei\Projects\Qt\Table\comboboxdelegate.cpp：

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#include "comboboxdelegate.h"
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ComboBoxDelegate::ComboBoxDelegate()
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{
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}
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QWidget* ComboBoxDelegate::createEditor(QWidget* parent,
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    QStyleOptionViewItem const& option, QModelIndex const& index) const
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{
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    Q_UNUSED(option)
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    Q_UNUSED(index)
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    QComboBox* editor = new QComboBox(parent);
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    editor->addItem("男");
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    editor->addItem("女");
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    return editor;
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}
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void ComboBoxDelegate::setEditorData(QWidget* editor,
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    QModelIndex const& index) const
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{
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    static_cast<QComboBox*>(editor)->setCurrentText(
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        index.model()->data(index, Qt::EditRole).toString());
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}
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void ComboBoxDelegate::setModelData(QWidget* editor,
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    QAbstractItemModel* model, QModelIndex const& index) const
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{
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    model->setData(index,
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        static_cast<QComboBox*>(editor)->currentText(), Qt::EditRole);
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}
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void ComboBoxDelegate::updateEditorGeometry(QWidget* editor,
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    QStyleOptionViewItem const& option, QModelIndex const& index) const
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{
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    Q_UNUSED(index)
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    editor->setGeometry(option.rect);
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}

55.2 为表格的“性别”列设置组合框代理类

C:\Users\Minwei\Projects\Qt\Table\tablewindow.cpp：

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...
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#include "comboboxdelegate.h"
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...
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TableWindow::TableWindow(QWidget *parent)
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    : QMainWindow(parent)
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    ...
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{
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    ...
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    ui->m_table->setItemDelegateForColumn(3, new ComboBoxDelegate);
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    ...
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}
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...

55.3 测试验证

运行效果如图所示：