[Qt]双击事件导致的问题

有如下代码

cpp 复制代码

#include "mymodel.h"
#include <QDebug>

myModel::myModel(QObject *parent) : QAbstractTableModel(parent)
{
    status << Qt::Unchecked << Qt::Unchecked << Qt::Unchecked;
}

int myModel::rowCount(const QModelIndex &parent)const
{
    Q_UNUSED(parent);
    return 3;
}

int myModel::columnCount(const QModelIndex &parent)const
{
    Q_UNUSED(parent);
    return 2;
}

void myModel::setHeader(const QStringList &list)
{
    m_header = list;
}

QVariant myModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if(role == Qt::DisplayRole)
    {
        if(orientation == Qt::Horizontal)
        {
            return m_header.at(section);
        }
    }
    return QVariant();
}

QVariant myModel::data(const QModelIndex &index, int role)const
{
    if(role == Qt::DisplayRole)
    {
        if(index.column() == 0)
        {
            return QStringLiteral("%1号同学").arg(index.row() + 1);
        }
        if(index.column() == 1)
        {
            return QStringLiteral("1000%1").arg(index.row() + 1);
        }
    }
    if(role == Qt::CheckStateRole)
    {
        if(index.column() == 0)
        {
            return status.at(index.row());
        }
        return QVariant();
    }
    return QVariant();
}

Qt::ItemFlags myModel::flags(const QModelIndex &index) const
{
    if(!index.isValid())
    {
        return QAbstractItemModel::flags(index);
    }
    Qt::ItemFlags flags = QAbstractItemModel::flags(index);
    if(index.column() == 0)
    {
        flags |= Qt::ItemIsUserCheckable;
    }
    return flags;
}

bool myModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if(!index.isValid())
    {
        return false;
    }

    if(role == Qt::CheckStateRole)
    {
        if(index.column() == 0)
        {
            status[index.row()] = value.toInt();
            emit dataChanged(index, index);
            return true;
        }
    }
    return false;
}

效果如下

额，效果不是很明显。但是当我快速点击鼠标左键时，发现checkbox的状态并没有立即修改，这是因为快速点击鼠标左键时，被识别成了双击事件，修改思路如下，创建一个类继承于QStyledItemDelegate，然后重写 bool QStyledItemDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index) 这个方法，当遇到双击事件时，单独处理即可。代码如下

cpp 复制代码

#include "MyStyledItemDelegate.h"
#include <QEvent>

MyStyledItemDelegate::MyStyledItemDelegate(QObject *parent) : QStyledItemDelegate(parent)
{

}

bool MyStyledItemDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
    if(event->type() == QEvent::MouseButtonDblClick && index.column() == 0){
        model->setData(index, index.data(Qt::CheckStateRole).toInt() == Qt::Checked ? Qt::Unchecked : Qt::Checked ,Qt::CheckStateRole);
        return true;
    }else{
        return QStyledItemDelegate::editorEvent(event, model, option, index);
    }
}

修正后效果如图