Qt tableView中的代理继承重写paint函数绘制的图片，不会移动

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2021-02-18 08:48:26

这是代码

#ifndef DELETETOOLBUTTONDELEGATE_H

#define DELETETOOLBUTTONDELEGATE_H



#include    <QObject>

#include    <QWidget>

#include    <QItemDelegate>

#include    <QMap>

#include    <QStyleOptionButton>

#include    <QModelIndex>



class DeleteToolButtonDelegate :public QItemDelegate

{

    Q_OBJECT

public:

    DeleteToolButtonDelegate(QObject *parent=0);



//自定义代理组件必须继承以下4个函数

//创建编辑组件

    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,

                          const QModelIndex &index) const Q_DECL_OVERRIDE;

//从数据模型获得数据，显示到代理组件中

    void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE;

//将代理组件的数据，保存到数据模型

    void setModelData(QWidget *editor, QAbstractItemModel *model,

                      const QModelIndex &index) const Q_DECL_OVERRIDE;

//更新代理编辑组件的大小

    void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,

                              const QModelIndex &index) const Q_DECL_OVERRIDE;



    void paint(QPainter *painter, const QStyleOptionViewItem &option,

        const QModelIndex & index ) const Q_DECL_OVERRIDE;

private:

    QMap<QModelIndex, QStyleOptionButton*> m_btns;



signals:

    void deleteCommodityData() const;

};



#endif // DELETETOOLBUTTONDELEGATE_H



void DeleteToolButtonDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const

{





    QStyleOptionButton* button = m_btns.value(index);



    if (!button) {

        button = new QStyleOptionButton();

       button->rect = option.rect.adjusted(0, 0, 0, 0);

        //button->rect =  QRect(option.rect.left(), option.rect.top(), option.rect.width(), option.rect.height());

        //button->text = "X";

        button->state |= QStyle::State_Enabled;

        button->icon = QIcon(":/Image/sc.png");

        button->iconSize = QSize(option.rect.width(), option.rect.height());



        (const_cast<DeleteToolButtonDelegate*>(this))->m_btns.insert(index, button);

    }

    painter->save();



    if (option.state & QStyle::State_Selected) {//被选中高亮

        painter->fillRect(option.rect, option.palette.highlight());



    }

    painter->restore();

    QApplication::style()->drawControl(QStyle::CE_PushButton, button, painter);

}