QTableWidget指定某行某列只能输入数字

主要通过给QTableWidget设置代理，即继承QItemDelegate类重写其中的方法实现，具体代码如下：

 1 /**
 2  * @file NonNegativeNumberItemDelegate.h
 3  * @brief 非负整数校验代理
 4  * @author 禅元天道 ([email protected])
 5  * @date 2024-01-24
 6  */
 7 #ifndef NONNEGATIVENUMBERITEMDELEGATE_H
 8 #define NONNEGATIVENUMBERITEMDELEGATE_H
 9 
10 #include <QItemDelegate>
11 
12 /**
13 * @brief 非负整数校验代理类
14 * @author 禅元天道 ([email protected])
15 * @date 2024-01-24
16 */
17 class NonNegativeNumberItemDelegate : public QItemDelegate
18 {
19 public:
20     NonNegativeNumberItemDelegate(QObject* parent = nullptr);
21     /**
22     * @brief 创建编辑器.
23     * @author 禅元天道 ([email protected])
24     * @date 2024-01-24
25     */
26     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
27     /**
28     * @brief 设置编辑器的值.
29     * @author 禅元天道 ([email protected])
30     * @date 2024-01-24
31     */
32     void setEditorData(QWidget *editor, const QModelIndex &index) const override;
33     /**
34     * @brief 设置控件对应单元格的值.
35     * @author 禅元天道 ([email protected])
36     * @date 2024-01-24
37     */
38     void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override;
39     /**
40     * @brief 设置控件的属性.
41     * @author 禅元天道 ([email protected])
42     * @date 2024-01-24
43     */
44     void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
45 };
46 
47 #endif // NONNEGATIVENUMBERITEMDELEGATE_H

 1 /**
 2  * @file NonNegativeNumberItemDelegate.cpp
 3  * @brief 非负整数校验代理
 4  * @author 禅元天道 ([email protected])
 5  * @date 2024-01-24
 6  */
 7 #include "NonNegativeNumberItemDelegate.h"
 8 #include <QLineEdit>
 9 #include <QIntValidator> 
10 #include <QModelIndex>
11 #include <QAbstractItemModel>
12 
13 
14 NonNegativeNumberItemDelegate::NonNegativeNumberItemDelegate(QObject* parent) : QItemDelegate(parent)
15 {
16 
17 }
18 /**
19 * @brief 创建编辑器.
20 * @author 禅元天道 ([email protected])
21 * @date 2024-01-24
22 */
23 QWidget *NonNegativeNumberItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &) const
24 {
25     QLineEdit* editor = new QLineEdit(parent);
26     editor->setStyleSheet("border:0px;");
27     QIntValidator* intValidator = new QIntValidator(editor);
28     intValidator->setBottom(0);
29     editor->setValidator(intValidator);
30     return editor;
31 }
32 /**
33 * @brief 设置编辑器的值.
34 * @author 禅元天道 ([email protected])
35 * @date 2024-01-24
36 */
37 void NonNegativeNumberItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
38 {
39     QLineEdit* lineEdit = qobject_cast<QLineEdit*>(editor);
40     QString value = index.model()->data(index).toString();
41     lineEdit->setText(value);
42 }
43 /**
44 * @brief 设置控件对应单元格的值.
45 * @author 禅元天道 ([email protected])
46 * @date 2024-01-24
47 */
48 void NonNegativeNumberItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
49 {
50     QLineEdit* lineEdit = qobject_cast<QLineEdit*>(editor);
51     QString text = lineEdit->text().trimmed();
52     while (text.startsWith("0") && text != "0") 
53     {
54         text = text.mid(1);
55     }
56     model->setData(index, text);
57 }
58 /**
59 * @brief 设置控件的属性.
60 * @author 禅元天道 ([email protected])
61 * @date 2024-01-24
62 */
63 void NonNegativeNumberItemDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &) const
64 {
65     editor->setGeometry(option.rect);
66 }

使用方法：

1 NonNegativeNumberItemDelegate* itemDelegate = new NonNegativeNumberItemDelegate;
2 _ui->tableWidget->setItemDelegateForColumn(1, itemDelegate);
3 _ui->tableWidget->setItemDelegateForRow(1, itemDelegate);