QTabelView使用代理自定义，第一列为QLabel第二列为下拉框（2）

上一章节中的不足是需要进入编辑模式才能显示数据（即双击才能展示），但是真实的项目中需要默认需要展示数据的。需要实现paint函数和setmodel的时候设置自定义数据代码全部如下

CustomParamViewDelegate.cpp

#include "CustomParamViewDelegate.h"

CustomParamViewDelegate::CustomParamViewDelegate(QObject *parent)
    : QStyledItemDelegate(parent)
{}

CustomParamViewDelegate::~CustomParamViewDelegate()
{}

QWidget* CustomParamViewDelegate::createEditor(QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index) const
{
    int type = index.data(Qt::UserRole).toInt();

    switch (type) {
    case (CustomParamViewDelegate::Type_ComboBox): {
        return new QComboBox(parent);
    }
    case (CustomParamViewDelegate::Type_Label): {
        return new QLabel(parent);
    }
    case (CustomParamViewDelegate::Type_LinEdit): {
        return new QLineEdit(parent);
    }
    default:
        break;
    }
    return nullptr;
}

void CustomParamViewDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
    int type = index.data(Qt::UserRole).toInt();
    //QString data = index.data().toString();
    QString data = index.data(Qt::UserRole + 1).toString();

    switch (type) {
    case (CustomParamViewDelegate::Type_ComboBox): {
        QComboBox* cob = static_cast<QComboBox*>(editor);
        QStringList strList = data.split(",");
        cob->addItems(strList);
        cob->setCurrentIndex(cob->findText(data));
        break;
    }
    case (CustomParamViewDelegate::Type_Label): {
        QLabel *label = static_cast<QLabel*>(editor);
        label->setText(data);
        break;
    }
    case (CustomParamViewDelegate::Type_LinEdit): {

        break;
    }
    default:
        break;
    }
}

void CustomParamViewDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    editor->setGeometry(option.rect);
}

void CustomParamViewDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
{
    int type = index.data(Qt::UserRole).toInt();
    QString value;
    switch (type) {
    case (CustomParamViewDelegate::Type_ComboBox): {
        QComboBox* cob = static_cast<QComboBox*>(editor);
        value = cob->currentText();
        break;
    }
    case (CustomParamViewDelegate::Type_Label): {
        QLabel* cob = static_cast<QLabel*>(editor);
        value = cob->text();
        break;
    }
    case (CustomParamViewDelegate::Type_LinEdit): {
        break;
    }
    default:
        break;
    }
    bool ret = model->setData(index, value, Qt::EditRole);
    ret = model->setData(index, value, Qt::UserRole + 2);
}

void CustomParamViewDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    if (index.isValid() && (index.column() == 0))
    {
        QStyledItemDelegate::paint(painter, option, index); //默认
    }
    else  if(index.isValid() && (index.column() == 1)) {
        QString data = index.data(Qt::UserRole + 2).toString();
        QLineEdit label;
        label.setStyleSheet("border: none; ");
        label.setText(data);
        painter->save();
        painter->translate(option.rect.x(), option.rect.y());
        label.render(painter);
        painter->restore();
    }

}

CustomParamViewDelegate.h

#pragma once

#include <QItemDelegate>
#include <QStyledItemDelegate>
#include <QComboBox>
#include <QApplication>
#include <QLabel>
#include <QLineEdit>
#include <QPainter>
class CustomParamViewDelegate  : public QStyledItemDelegate
{
    Q_OBJECT
public:
    enum ItemDelegate {
        Type_ComboBox = 1,
        Type_Label,
        Type_LinEdit
    };

    CustomParamViewDelegate(QObject *parent);
    ~CustomParamViewDelegate();

    // 创建编辑器
    virtual QWidget* createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
    // 设置编辑器数据
    virtual void setEditorData(QWidget* editor, const QModelIndex& index) const override;
    // 更新编辑器集合属性
    virtual void updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
    // 设置模型数据
    virtual void setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const override;
    // 绘制
    virtual void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
    //鼠标事件
    //bool editorEvent(QEvent* event, QAbstractItemModel* model, const QStyleOptionViewItem& option, const QModelIndex& index);
private:
    QStringList m_comboBoxList;
};

调用方式
widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //tableView是ui上的tabelview插件
    m_paramViewMode = new QStandardItemModel;
    m_paramViewMode = new QStandardItemModel( ui->tableView);
    m_paramViewMode->setHorizontalHeaderLabels(QStringList() << "1" << "2");
    m_delegateParam = new CustomParamViewDelegate( ui->tableView);
    ui->tableView->setItemDelegate(m_delegateParam);
    ui->tableView->horizontalHeader()->setStretchLastSection(true);
    ui->tableView->setModel(m_paramViewMode);

    QStandardItem* itemLabel = new QStandardItem;
    itemLabel->setData(CustomParamViewDelegate::Type_Label, Qt::UserRole);
    itemLabel->setData(QString("%1").arg(0), Qt::UserRole + 1);

    QStandardItem* itemBox = new QStandardItem;
    itemBox->setData(CustomParamViewDelegate::Type_ComboBox, Qt::UserRole);
    itemBox->setData("1,2,3,4,5", Qt::UserRole + 1);
    itemBox->setData("首次显示这个玩意", Qt::UserRole + 2);

    m_paramViewMode->setItem(0, 0, itemLabel);
    m_paramViewMode->setItem(0, 1, itemBox);
}

Widget::~Widget()
{
    delete ui;
}

头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QStandardItemModel>
#include  "CustomParamViewDelegate.h"

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;
    QStandardItemModel *m_paramViewMode;
    CustomParamViewDelegate *m_delegateParam;
};
#endif // WIDGET_H