Library_Project/demo/ViewModel/Delegate/CheckBoxDelegate.cpp

#include "CheckBoxDelegate.h"

#include <QCheckBox>
#include <QPainter>
#include <QApplication>


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


CheckBoxDelegate::~CheckBoxDelegate()
{

}

QWidget* CheckBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    // QCheckBox *checkBox = new QCheckBox(parent);
    // checkBox->setText("Check me");
    // return checkBox;
    return nullptr;
}

void CheckBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{

}

void CheckBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{

}

void CheckBoxDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{

}


void CheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    // 获取复选框状态
    bool checked = index.data(Qt::CheckStateRole).toInt() == Qt::Checked;
    // 获取文本
    QString text = index.data(Qt::DisplayRole).toString();

    QStyleOptionButton checkBoxOption;
    QRect checkBoxRect = QApplication::style()->subElementRect(QStyle::SE_CheckBoxIndicator, &checkBoxOption);
    checkBoxOption.rect = QRect(option.rect.left(), option.rect.top() + (option.rect.height() - checkBoxRect.height()) / 2, checkBoxRect.width(), checkBoxRect.height());
    checkBoxOption.state = QStyle::State_Enabled | (checked ? QStyle::State_On : QStyle::State_Off);

    // 绘制复选框
    QApplication::style()->drawControl(QStyle::CE_CheckBox, &checkBoxOption, painter);

    // 绘制文本
    QRect textRect = option.rect;
    textRect.setLeft(checkBoxOption.rect.right() + 4); // 复选框后留点间距
    painter->drawText(textRect, Qt::AlignVCenter | Qt::AlignLeft, text);
}

bool CheckBoxDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
    if (event->type() == QEvent::MouseButtonRelease) 
    {
        // Handle checkbox toggle logic here
        bool currentState = index.data(Qt::CheckStateRole).toBool();
        model->setData(index, !currentState, Qt::CheckStateRole);
        return true;
    }
    return QStyledItemDelegate::editorEvent(event, model, option, index);
}