QTableWidget设置代理 添加QCombox

一、实现功能：向QTableWidget上添加QCombox

　　显示效果：双击鼠标才显示Combox组件

　　如下图所示：未双击效果图

　　双击效果图：

二、向第二列添加combox代码如下　　

1 ui.tableWidget_TestItems->verticalHeader()->setVisible(false);//隐藏垂直表头
2 ui.tableWidget_TestItems->setSelectionBehavior(QAbstractItemView::SelectRows);//选择一行
3 setItemIsEditable(ui.tableWidget_TestItems, 0);//禁止表格编辑
4 setItemIsEditable(ui.tableWidget_TestItems, 2);
5 setItemIsEditable(ui.tableWidget_TestItems, 3);
6 ui.tableWidget_TestItems->setItemDelegateForColumn(1, new Delegate(this));//添加QCombox代理

三、封装Delegate类

 1 #ifndef DELEGATE_H
 2 #define DELEGATE_H
 3
 4 #include <QStyledItemDelegate>
 5 #include <QItemDelegate>
 6 #include <QModelIndex>
 7 #include <QPainter>
 8 #include <QWidget>
 9
10 #define  COMBOXCOL 1
11 class Delegate : public QItemDelegate
12 {
13     Q_OBJECT
14
15 public:
16     Delegate(QObject *parent = nullptr);
17     ~Delegate();
18
19     void paint(QPainter *painter, const QStyleOptionViewItem &option,
20                     const QModelIndex &index) const;
21     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
22
23     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
24                                         const QModelIndex &index) const;
25     void setEditorData(QWidget *editor, const QModelIndex &index) const;
26     void setModelData(QWidget *editor, QAbstractItemModel *model,
27                                     const QModelIndex &index) const;
28
29 private:
30
31 };
32
33 #endif // DELEGATE_H

 1 #include "Delegate.h"
 2 #include <QComboBox>
 3
 4 Delegate::Delegate(QObject *parent)
 5     : QItemDelegate(parent)
 6 {
 7
 8 }
 9
10 Delegate::~Delegate()
11 {
12
13 }
14 void Delegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
15     const QModelIndex &index) const
16 {
17     QItemDelegate::paint(painter, option, index);
18 }
19
20 QSize Delegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
21 {
22     return QItemDelegate::sizeHint(option, index);
23 }
24
25 QWidget *Delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,
26                                                    const QModelIndex &index) const
27 {
28     if (index.isValid() && index.column() == COMBOXCOL)
29     {
30         QComboBox *editor = new QComboBox(parent);
31         editor->setEditable(true);
32         editor->installEventFilter(const_cast<Delegate *>(this));
33         return editor;
34     }
35     else
36     {
37         return QItemDelegate::createEditor(parent, option, index);
38     }
39 }
40
41 void Delegate::setEditorData(QWidget *editor, const QModelIndex &index) const
42 {
43     if (index.isValid() && index.column() == COMBOXCOL)
44     {
45         QString value = index.model()->data(index, Qt::DisplayRole).toString();
46         QComboBox *combox = static_cast<QComboBox *>(editor);
47         combox->addItem("+");
48         combox->addItem("+2");
49         combox->addItem("+3");
50         combox->addItem("+4");
51         combox->setCurrentText(value);
52     }
53     else
54     {
55         QItemDelegate::setEditorData(editor, index);
56     }
57 }
58
59 void Delegate::setModelData(QWidget *editor, QAbstractItemModel *model,
60                                              const QModelIndex &index) const
61 {
62     if (index.isValid() && index.column() == COMBOXCOL)
63     {
64         QComboBox *combox = static_cast<QComboBox *>(editor);
65         model->setData(index, combox->currentText());
66     }
67     else
68     {
69         QItemDelegate::setModelData(editor, model, index);
70     }
71 }