C++ QListWidget::sizeHintForColumn方法代码示例

void OperationsDelegate::setEditorData(QWidget *editor,
                                       const QModelIndex &index) const
      {
      const QVariant value = index.data(Qt::EditRole);
      if (value.type() == QVariant::StringList) {
            QListWidget *lw = qobject_cast<QListWidget *>(editor);
            const auto items = lw->findItems(index.data(Qt::DisplayRole).toString(), Qt::MatchExactly);
            if (!items.empty())
                  lw->setCurrentItem(items.first());
            else
                  lw->setCurrentItem(lw->item(0));

            const int extraWidth = 25;
            const int extraHeight = 6;
            lw->setMinimumWidth(lw->sizeHintForColumn(0) + extraWidth);
                        // to prevent possible hiding bottom part of the list
            const int h = lw->count() * (lw->visualItemRect(lw->currentItem()).height() + extraHeight);
            const int y = (lw->parentWidget() && (lw->parentWidget()->rect().bottom() < lw->y() + h))
                        ? lw->parentWidget()->rect().bottom() - h - extraHeight : lw->y();
            lw->setGeometry(lw->x(), y, lw->width(), h);
                        // now lw can be partially hidden behind the tree view
                        // if tree view has small rect, so set parent of lw
                        // to app window and map coordinates accordingly to leave lw in place
            const auto globalCoord = lw->parentWidget()->mapToGlobal(lw->geometry().topLeft());
            lw->setParent(appWindow);
            const auto newLocalCoord = appWindow->mapFromGlobal(globalCoord);
            lw->setGeometry(newLocalCoord.x(), newLocalCoord.y(), lw->width(), h);
            }
      else        // single value
            QStyledItemDelegate::setEditorData(editor, index);
      }

void ItemOrderList::insertItem(const QString &label, bool checked, bool highlight, const QIcon &icon,
                               const ItemPtr &item, int targetRow)
{
    QListWidget *list = ui->listWidgetItems;
    QListWidgetItem *listItem = new QListWidgetItem(icon, label);
    const int row = targetRow >= 0 ? qMin(list->count(), targetRow) : list->count();
    list->insertItem(row, listItem);
    listItem->setCheckState(checked ? Qt::Checked : Qt::Unchecked);
    setItemHighlight(listItem, highlight);

    m_items[listItem] = ItemWidgetPair(item);

    // Resize list to minimal size.
    const int w = list->sizeHintForColumn(0)
                + list->verticalScrollBar()->sizeHint().width() + 4;
    list->setMaximumWidth(w);

    if ( list->currentItem() == NULL )
        list->setCurrentRow(row);
}

void ItemOrderList::insertItem(const QString &label, bool checked, const QIcon &icon,
                               const ItemPtr &item, int targetRow)
{
    QListWidget *list = ui->listWidgetItems;
    auto listItem = new QListWidgetItem(icon, label);
    listItem->setCheckState(checked ? Qt::Checked : Qt::Unchecked);
    m_items[listItem] = ItemWidgetPair(item, checked);

    const int row = targetRow >= 0 ? qMin(list->count(), targetRow) : list->count();
    list->insertItem(row, listItem);

    // Resize list to minimal size.
    if ( !isVisible() ) {
        const int w = list->sizeHintForColumn(0)
                    + list->verticalScrollBar()->sizeHint().width() + 4;
        list->resize( w, list->height() );
    }

    if ( list->currentItem() == nullptr )
        list->setCurrentRow(row);
}

QWidget*  MultiDelegate::createEditor( QWidget* parent,
                                     const QStyleOptionViewItem& option,
                                     const QModelIndex& index)  const
{
    const QAbstractItemModel*  model = index.model();
    QVariant  value = model->data( index, Qt::EditRole);
    switch (value.type()) {
    case QMetaType::QTime:
    {
        QTimeEdit*  editor = new QTimeEdit( parent);
        editor->setMaximumWidth( editor->sizeHint().width());

        //// Get value snapshot into editor
        editor->setTime( value.toTime());
        return editor;
    }
    case QMetaType::QDate:
    {
        QDateEdit*  editor = new QDateEdit( parent);
        setupCalenderWidget( editor);
        editor->setMaximumWidth( editor->sizeHint().width());

        //// Get value snapshot into editor
        editor->setDate( value.toDate());
        return editor;
    }
    case QMetaType::QDateTime:
    {
        QDateTimeEdit*  editor = new QDateTimeEdit( parent);
        setupCalenderWidget( editor);
        editor->setMaximumWidth( editor->sizeHint().width());

        editor->setDateTime( value.toDateTime());
        return editor;
    }
    case QMetaType::QImage:
        // Fall throu
    case QMetaType::QPixmap:
        // Fall throu
    case QMetaType::QIcon:
    {
        PixmapViewer*  editor = new PixmapViewer( parent);
        connect( editor, SIGNAL(finished(int)), this, SLOT(closeEmittingEditor()));
        return editor;
    }
    case QMetaType::QStringList:
    {
        QVariant  varList = index.model()->data( index, ItemDataRole::EnumList);
        if (varList.isNull())  break;  // Not a enum-list, fall to std

        QListWidget*  editor = new QListWidget( parent);
        foreach (const QString& bitItemText, varList.toStringList()) {
            QListWidgetItem* bitItem = new QListWidgetItem( bitItemText, editor);
            bitItem->setFlags(bitItem->flags() | Qt::ItemIsUserCheckable);
            bitItem->setCheckState(Qt::Unchecked);
        }
        int width  = editor->sizeHintForColumn(0) + 25;
        int height = editor->sizeHintForRow(0) * editor->count() + 10;
        editor->setMinimumWidth( width);
        editor->setMaximumWidth( width);
        editor->setMinimumHeight( height);
        editor->setMaximumHeight( height);

        //// Get value snapshot into editor
        QStringList  valList = value.toStringList();
        int  itemCount = editor->count();
        for (int i = 0; i < itemCount; ++i) {
            QListWidgetItem*  bitItem = editor->item(i);
            bool  isActive = valList.contains( bitItem->text());
            bitItem->setCheckState( isActive ? Qt::Checked : Qt::Unchecked);
        }
        return editor;
    }
    case QMetaType::QString:
    {
        QVariant  varList = index.model()->data( index, ItemDataRole::EnumList);
        if (varList.isNull())  break;  // Not a enum-list, fall to std

        QComboBox*  editor = new QComboBox( parent);
        editor->setSizeAdjustPolicy(QComboBox::AdjustToContents);
        editor->addItems( varList.toStringList());
        editor->setMaximumWidth( editor->minimumSizeHint().width());

        //// Get value snapshot into editor
        editor->setCurrentIndex( editor->findText( value.toString()));
        return editor;
    }
    default:;
    }

    if (index.column() == 0) {
        emit itemEditTrigged( index);
        return 0;  // No inline editor
    }

    QWidget*  editor = QItemDelegate::createEditor( parent, option, index);

    //// Get value snapshot into editor
    QItemDelegate::setEditorData( editor, index);
    return editor;
//.........这里部分代码省略.........