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这几天遇到一个关于qt的问题。我想在我的 qt 应用程序中使用 QTableview 显示一个批处理数据（不是 qml gridview，因为我的应用程序使用小部件）。每个数据项包括一个图像和一个图像名称。我需要让图像显示在一个 qlabel 上，它的名称显示在另一个 qlabel 上。这两个小部件应该显示在我的自定义框架上。然后我会让用户定义的框架显示在每个 QTableView 的单元格中。

从 BigBourin（他也问了类似的问题），我知道我应该实现一个自定义委托，并重新实现painter 函数，就像这样： 

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

// here we have active painter provided by caller

// by the way - we can't use painter->save() and painter->restore()
// methods cause we have to call painter->end() method before painting
// the QWidget, and painter->end() method deletes
// the saved parameters of painter

// we have to save paint device of the provided painter to restore the painter
// after drawing QWidget
QPaintDevice* original_pdev_ptr = painter->device();

// example of simple drawing (selection) before widget
if (option.state & QStyle::State_Selected)
    painter->fillRect(option.rect, option.palette.highlight());

// creating local QWidget (that's why i think it should be fasted, cause we 
// don't touch the heap and don't deal with a QWidget except painting)
PackageListItemWidget item_widget;

// Setting some parameters for widget for example
    // spec. params
item_widget.SetPackageName(index.data(Qt::DisplayRole).toString());     
    // geometry
item_widget.setGeometry(option.rect);

// here we have to finish the painting of provided painter, cause
//     1) QWidget::render(QPainter *,...) doesn't work with provided external painter 
//          and we have to use QWidget::render(QPaintDevice *,...)
//          which creates its own painter
//     2) two painters can't work with the same QPaintDevice at the same time
painter->end(); 

// rendering of QWidget itself
item_widget.render(painter->device(), QPoint(option.rect.x(), option.rect.y()), QRegion(0, 0, option.rect.width(), option.rect.height()), QWidget::RenderFlag::DrawChildren);   

// starting (in fact just continuing) painting with external painter, provided
// by caller
painter->begin(original_pdev_ptr);  

// example of simple painting after widget
painter->drawEllipse(0,0, 10,10);   
};

我的问题是 item_widget.SetPackageName(index.data(Qt::DisplayRole).toString());

数据从哪里来？数据可以是用户定义的数据类吗？

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