Question

当我在 treeView 中使用 Key_Up 或 Key_Down 移动当前索引时，我发现移动的当前索引仅在此之后应用第return QWidget::eventFilter(watched, event);行。如何获得return QWidget::eventFilter(watched, event);之前的新移动索引？我试图用currentIndex = currentIndex-1;手动更改已移动的当前索引，但是没有用。

bool TipManager::eventFilter(QObject *watched, QEvent *event)
{
    if(watched == ui->treeView && event->type() == QEvent::KeyPress){
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        QModelIndex currentIndex = ui->treeView->currentIndex();

        if( keyEvent->key() == Qt::Key_Up )
        {
            //currentIndex = currentIndex-1;
        }
        if( keyEvent->key() == Qt::Key_Down )
        {
            //currentIndex = currentIndex+1;
        }
        if(currentIndex.isValid())
        {
            ui->treeView->setCurrentIndex(currentIndex);
            trimCurrentPath(currentIndex);
        }
    }
    return QWidget::eventFilter(watched, event);
}

Answer 1

您可以先将事件传递下去，然后检查索引：

bool TipManager::eventFilter(QObject *watched, QEvent *event)
{
    bool const ret = QWidget::eventFilter(watched, event);

    if(watched == ui->treeView && event->type() == QEvent::KeyPress){
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        QModelIndex currentIndex = ui->treeView->currentIndex();

        if( keyEvent->key() == Qt::Key_Up )
        {
            //currentIndex = currentIndex-1;
        }
        if( keyEvent->key() == Qt::Key_Down )
        {
            //currentIndex = currentIndex+1;
        }
        if(currentIndex.isValid())
        {
            ui->treeView->setCurrentIndex(currentIndex);
            trimCurrentPath(currentIndex);
        }
    }
    return ret;
}

但是我想实际上只有在离开 eventFilter(watched, event) ...

之后，索引才会更改

如何在eventFilter处理程序中返回之前获取当前索引？

1 个答案: