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I have got a QListWidgetItem, which has a QWidget and some QLabels. The height of the labels (imageLabel, titleLabel and descriptionLabel) varies depending on the text length. So does the height of the QWidget, which leds to different sizes in QListWidgetItem. So far the parameters for setSizeHint are static:

QListWidgetItem* listWidgetItem = new QListWidgetItem();
listWidgetItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);
listWidgetItem->setSizeHint(200, 180));

QWidget* widget = new QWidget();

QVBoxLayout* rootLayout = new QVBoxLayout();
rootLayout->setAlignment(Qt::AlignTop);

QHBoxLayout* contentLayout = new QHBoxLayout();
contentLayout->setAlignment(Qt::AlignLeft);

QLabel* imageLabel = new QLabel();
imageLabel->setPixmap(pixmap);

contentLayout->addWidget(imageLabel, 0, Qt::AlignTop);

QVBoxLayout* informationLayout = new QVBoxLayout();
informationLayout->setAlignment(Qt::AlignTop);

QLabel* titleLabel = new QLabel("<b>" + title  + "</b>");
titleLabel->setWordWrap(true);
informationLayout->addWidget(titleLabel);

QLabel* descriptionLabel = new QLabel(description);
descriptionLabel->setWordWrap(true);
informationLayout->addWidget(descriptionLabel);

QLabel* dateLabel = new QLabel(date.toString());
informationLayout->addWidget(dateLabel);

contentLayout->addLayout(informationLayout);

rootLayout->addLayout(contentLayout);

QHBoxLayout* buttonLayout = new QHBoxLayout();
QPushButton* buttonOne = new QPushButton(tr("Button 1"));
QObject::connect(buttonOne, SIGNAL(clicked()), mButtonOneSignalMapper, SLOT(map()));
mButtonOneSignalMapper->setMapping(buttonOne, index);
buttonLayout->addWidget(buttonOne);

QPushButton* buttonTwo = new QPushButton(tr("Button 2"));
QObject::connect(buttonTwo, SIGNAL(clicked()), mButtonTwoSignalMapper, SLOT(map()));
mButtonTwoSignalMapper->setMapping(buttonTwo, index);
buttonLayout->addWidget(buttonTwo);

rootLayout->addLayout(buttonLayout);

widget->setLayout(rootLayout);

mListWidget->addItem(listWidgetItem);
mListWidget->setItemWidget(listWidgetItem, widget);

Is there any way to properly set the sizeHint regarding the width and height of the displayed content used in the QLabels of the QWidget?

For instance the first QListWidgetItem may have a descriptionLabel with a text length of 300 characters and the second QListWidgetItem may have a descriptionLabel with a text length of 1000 characters. So far both QListWidgetItems will have the same size (200px width and 180px height). While it may fit on the first QListWidgetItem, because it has only 300 characters, it may not fit on the second QListWidgetItem, because of the 1000 characters. Therefore I would like to somehow dynamically adjust the size of the QListWidgetItem regarding the needed space (first one will need less than the second one).

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1 回答 1

0

在我看来，除非您知道它的未来宽度，否则您将无法获得标签的正确边界矩形，以便您可以计算显示内容所需的行数。在计算带有其他小部件的布局之前，您不会获得宽度。

另一种方法可能是使用项目委托。它的 sizeHint 方法有一个带有初步矩形的选项参数，您可以从中使用宽度并使用字体度量计算高度。

关于其他小部件，您可以切换到 QTableWidget 并将它们放在其他列中。

以下代码不是一个工作示例..只是一些帮助您入门的线索..

class ItemDelegate : public QStyledItemDelegate
{
public:

    void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
    {
        painter->save();

        QStyledItemDelegate::paint(painter,option,index);

        QString title = index.data(Qt::UserRole).toString();
        QFont f = option.font;
        painter->setFont(f);
        QFontMetrics fm(f);

        QRect r = option.rect;
        // r = r.adjusted(0, fm.lineSpacing(), 0, 0);
        painter->drawText(r.left(), r.top(), r.width(), r.height(), Qt::AlignTop|Qt::AlignLeft|Qt::TextWordWrap, title, &r);

        painter->restore();
    }

    QSize sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const
    {
        QFont f = option.font;
        QRect r = option.rect;
        QFontMetrics fm(f);
        QString title = index.data(Qt::UserRole).toString();
        QRect br = fm.boundingRect(r,Qt::AlignTop|Qt::AlignLeft | Qt::TextWordWrap,title);
        return QSize(option.rect.width(),br.height());
    }
};

希望能帮助到你，

约翰内斯

于 2014-08-15T16:48:56.223 回答