QChildEvent

Child events are sent immediately to objects when children are added or removed.

Demo1: childEvent

开发者ID:KDE，项目名称:tupi，代码行数:29，代码来源:tvhbox.cpp

void KoVBox::childEvent(QChildEvent *event)
{
    switch (event->type()) {
    case QEvent::ChildAdded: {
        QChildEvent *childEvent = static_cast<QChildEvent *>(event);
        if (childEvent->child()->isWidgetType()) {
            QWidget *widget = static_cast<QWidget *>(childEvent->child());
            static_cast<QBoxLayout *>(layout())->addWidget(widget);
        }
        break;
    }
    case QEvent::ChildRemoved: {
        QChildEvent *childEvent = static_cast<QChildEvent *>(event);
        if (childEvent->child()->isWidgetType()) {
            QWidget *widget = static_cast<QWidget *>(childEvent->child());
            static_cast<QBoxLayout *>(layout())->removeWidget(widget);
        }
        break;
    }
    default:
        break;
    }
    QFrame::childEvent(event);
}

Demo2:event

开发者ID:BackupTheBerlios，项目名称:sim-im-svn，代码行数:29，代码来源:zodiak.cpp

bool TVHBox::event(QEvent* ev)
{
    switch (ev->type()) {
        case QEvent::ChildAdded:
        {
            QChildEvent* childEv = static_cast<QChildEvent *>(ev);

            if (childEv->child()->isWidgetType()) {
                QWidget* w = static_cast<QWidget *>(childEv->child());
                static_cast<QBoxLayout *>(layout())->addWidget(w);
            }

            return QWidget::event(ev);
        }
        case QEvent::ChildRemoved:
        {
            QChildEvent* childEv = static_cast<QChildEvent *>(ev);

            if (childEv->child()->isWidgetType()) {
                QWidget* w = static_cast<QWidget *>(childEv->child());
                static_cast<QBoxLayout *>(layout())->removeWidget(w);
            }

            return QWidget::event(ev);
        }
        default:
            return QWidget::event(ev);
    }
}

一个纯净的网站

https://vimsky.com/examples/

最后

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