自定义QItemDelegate实现带CheckBox复选框的自增ID表格列

来源：互联网发布：淘宝翻新机法律法规编辑：程序博客网时间：2024/05/17 23:48

查找并参阅了多位前辈的文章，最后总结如下：

新建C++类继承QItemDelegate，并覆写如下三个函数：

//绘制背景及内容、样式    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;//创建编辑控件   QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;//鼠标、键盘事件处理   bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index);

1、绘制自增的编号/行号及复选框

void MyAutoIndexColumnDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const{    QStyleOptionViewItem myOption = option;    //绘制背景（默认蓝色底），不写这句的话，复选框背景无法显示高亮状态    drawBackground(painter, myOption,index);    //绘制复选框，并根据index的Qt::CheckStateRole值改变状态    QRect r(myOption.rect.left()+3,myOption.rect.top()+myOption.rect.height()/2-8,16,16);    Qt::CheckState checkstate=static_cast<Qt::CheckState>(index.data(Qt::CheckStateRole).toInt());    drawCheck(painter, myOption,r,checkstate);    //序号居中显示，绘制时向右偏移一个值来避开Checkbox    QRect r1(r.right()+3,myOption.rect.top(),myOption.rect.width()-20,myOption.rect.height());    myOption.displayAlignment = Qt::AlignHCenter | Qt::AlignVCenter;     //绘制文本    drawDisplay(painter, myOption, r1,QString(" ")+ QString::number(index.row()+1));    //如果当前有焦点，就绘制一个焦点矩形，否则什么都不做    drawFocus(painter, myOption, myOption.rect);}

2、设置动作

bool MyAutoIndexColumnDelegate::editorEvent(QEvent *event,QAbstractItemModel *model,const QStyleOptionViewItem &option,onst QModelIndex &index){    if(event->type() == QEvent::KeyPress)        return false;    if(event->type() == QEvent::MouseButtonRelease)    {        QMouseEvent *mouse_event = static_cast<QMouseEvent*>(event);       //只有左键点击才有效               if(mouse_event->button() != Qt::LeftButton)        {            return false;        }//        QRect r(option.rect.left(),option.rect.top(),20,20);//        //直接点击复选框时才更改状态//        if(!r.contains(mouse_event->pos()));//        {//            return false;//        }        //根据当前单元格的选中状态来在 选中/未选中 之间切换        QVariant value = index.data(Qt::CheckStateRole);        Qt::CheckState state = (static_cast<Qt::CheckState>(value.toInt()) == Qt::Checked                                ? Qt::Unchecked : Qt::Checked);        //设置当前单元格的选中状态        bool ok=model->setData(index,state, Qt::CheckStateRole);        return ok;    }}

3、设置列内容不可编辑

QWidget *MyAutoIndexColumnDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const{    return NULL;}

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