Question

我使用多个 QTreeWidgetItem 创建了 QTreeWidget 。

这是我的代码：

//Defined property tree
m_pPropertyTree = new QTreeWidget();
m_pPropertyTree->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
m_pPropertyTree->setColumnCount(2);
m_pPropertyTree->setHeaderLabels(QStringList() << "Property" << "Value");
//Update to property tree
//--geometry
QTreeWidgetItem *pGeometryItem = new QTreeWidgetItem(m_pPropertyTree);
pGeometryItem->setText(0, "geometry");
//X
QTreeWidgetItem *pXItem = new QTreeWidgetItem();
pXItem->setText(0, "X");
pXItem->setText(1, QString::number(geometry().x()));
pXItem->setFlags(pXItem->flags() | Qt::ItemIsEditable);
pGeometryItem->addChild(pXItem);
//Y
QTreeWidgetItem *pYItem = new QTreeWidgetItem();
pYItem->setText(0, "Y");
pYItem->setText(1, QString::number(geometry().y()));
pYItem->setFlags(pYItem->flags() | Qt::ItemIsEditable);
pGeometryItem->addChild(pYItem);
//Width
QTreeWidgetItem *pWidthItem = new QTreeWidgetItem();
pWidthItem->setText(0, "Width");
pWidthItem->setText(1, QString::number(geometry().width()));
pWidthItem->setFlags(pWidthItem->flags() | Qt::ItemIsEditable);
pGeometryItem->addChild(pWidthItem);
//Height
QTreeWidgetItem *pHeightItem = new QTreeWidgetItem();
pHeightItem->setText(0, "Height");
pHeightItem->setText(1, QString::number(geometry().height()));
pHeightItem->setFlags(pHeightItem->flags() | Qt::ItemIsEditable);
pGeometryItem->addChild(pHeightItem);

双击某个项目时，我可以编辑该项目的文本。但是，我想只允许用户在编辑时输入数字。反正有吗？

Answer 1

我认为有很多方法，但QItemDelegate::createEditor的重载比其他方法更有用。

您应该使用QValidator编写代码，在您的情况下，请使用QIntValidator。

class CustomDelegate : public QItemDelegate
{
public:
    QWidget* createEditor(QWidget *parent, const QStyleOptionViewItem & option,
                      const QModelIndex & index) const
    {
        QLineEdit *lineEdit = new QLineEdit(parent);

        // Set your validator, such as 'only number between 0 ~ 9 )
        QIntValidator *validator = new QIntValidator(0, 9, lineEdit);
        lineEdit->setValidator(validator);

        return lineEdit;
    }
};

然后，将自定义委托设置为树。

m_pPropertyTree->setItemDelegate( new CustomDelegate );

QTreeWidgetItem可编辑仅允许输入数字

1 个答案: