我有一个QTableView
,我想验证用户输入。
如果用户在QTableView
的单元格中插入无效值,我想突出显示该单元格并停用QPushButton
。
我怎样才能做到这一点?我可以使用QValidator
吗?
答案 0 :(得分:11)
是的,您可以执行此操作,为此目的使用自定义QItemDelegate
(我使用QIntValidator
作为示例)。
部首:
#ifndef ITEMDELEGATE_H
#define ITEMDELEGATE_H
#include <QItemDelegate>
class ItemDelegate : public QItemDelegate
{
Q_OBJECT
public:
explicit ItemDelegate(QObject *parent = 0);
protected:
QWidget* createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
void setEditorData(QWidget * editor, const QModelIndex & index) const;
void setModelData(QWidget * editor, QAbstractItemModel * model, const QModelIndex & index) const;
void updateEditorGeometry(QWidget * editor, const QStyleOptionViewItem & option, const QModelIndex & index) const;
signals:
public slots:
};
#endif // ITEMDELEGATE_H
.cpp的
#include "itemdelegate.h"
#include <QLineEdit>
#include <QIntValidator>
ItemDelegate::ItemDelegate(QObject *parent) :
QItemDelegate(parent)
{
}
QWidget *ItemDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QLineEdit *editor = new QLineEdit(parent);
editor->setValidator(new QIntValidator);
return editor;
}
void ItemDelegate::setEditorData(QWidget *editor,
const QModelIndex &index) const
{
QString value =index.model()->data(index, Qt::EditRole).toString();
QLineEdit *line = static_cast<QLineEdit*>(editor);
line->setText(value);
}
void ItemDelegate::setModelData(QWidget *editor,
QAbstractItemModel *model,
const QModelIndex &index) const
{
QLineEdit *line = static_cast<QLineEdit*>(editor);
QString value = line->text();
model->setData(index, value);
}
void ItemDelegate::updateEditorGeometry(QWidget *editor,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
editor->setGeometry(option.rect);
}
用法:
#include "itemdelegate.h"
//...
ItemDelegate *itDelegate = new ItemDelegate;
ui->tableView->setItemDelegate(itDelegate);
在这种情况下,用户将无法输入错误的数据,但您可以使用下一个:
void ItemDelegate::setModelData(QWidget *editor,
QAbstractItemModel *model,
const QModelIndex &index) const
{
QLineEdit *line = static_cast<QLineEdit*>(editor);
QIntValidator validator;
int pos = 0;
QString data = line->text();
if(validator.validate(data,pos) != QValidator::Acceptable)
{
qDebug() << "not valid";//do something
}
else
{
model->setData(index, data);
}
}
但在这种情况下,请不要忘记从代码中删除editor->setValidator(new QIntValidator);
行