Qt，QListView模型

Question

我想为我的列表视图模型中的选定行设置背景颜色。选择另一行后，上一行的颜色变得透明。谢谢！

QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override { 
    if (role == Qt::DisplayRole) { 
     qDebug() << "get row:" << index.row(); 
     //auto sp = pets[index.row()].getSpecies(); 
     //return QString::fromStdString(sp); 
     string tara = v[index.row()].getTara(); 
     int pct = v[index.row()].getPct(); 
     QString linie; 
     linie.append(QString::fromStdString(tara)); 
     linie.append(" "); 
     linie.append(QString::number(pct)); 
     return linie; 
    } 
    if (role == Qt::BackgroundColorRole) 
    { 
      QBrush redBackground(Qt::red);//here ,i don't now to put a condition when row is selected 
      return redBackground; 
    } 

    return QVariant{}; 
} 
//here i try to brush the selected row 
QObject::connect(lst->selectionModel(), &QItemSelectionModel::selectionChanged, this, &Console::onSelectionChanged); 
void Console::onSelectionChanged() { 
auto sel = lst->selectionModel()->selectedIndexes(); 
QModelIndex firstSel = sel.at(0); 
Mymodel->setData(firstSel, QBrush(Qt::yellow), Qt::BackgroundColorRole); 
//Console is a class which inherits QWidget,here is a QListView* lst 

Answer 1

您需要跟踪您的视图的选择思想selection model。选择修改后，您可以将数据设置为您的模型。例如：model->setData(selectedIndex, QBrush(Qt::red), Qt::BackgroundColorRole);

您应该明白，可以将一个模型分配给多个视图。为了深入理解，我建议你阅读model-view programming in qt。