您可以在delegate类中使用信号和槽来捕获comboBox里的数据变化,并将这些信息发送给MainWindow。以下是一个示例:
在自定义delegate类中,添加一个自定义信号valueChanged,用于向MainWindow发送comboBox的值改变信息。
在createEditor函数中,连接comboBox的currentIndexChanged信号到自定义valueChanged信号。
在MainWindow中,连接delegate的valueChanged信号到槽函数。
在槽函数中获取comboBox的新值并进行相应操作。
下面是代码示例:
#include <QtWidgets>
class MyDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
explicit MyDelegate(QObject *parent = nullptr);
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
const QModelIndex &index) const override;
void setEditorData(QWidget *editor, const QModelIndex &index) const override;
void setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const override;
signals:
void valueChanged(const QString& newValue);
private slots:
void onCurrentIndexChanged(int index);
private:
mutable QMap<int, QStringList> m_comboBoxItems; // 存储每行第一列ComboBox的items
};
MyDelegate::MyDelegate(QObject *parent)
: QStyledItemDelegate(parent)
{
}
QWidget* MyDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
if (index.column() == 0) { // 第一列用ComboBox编辑器
QComboBox* comboBox = new QComboBox(parent);
QStringList items = {"item1", "item2", "item3"};
comboBox->addItems(items);
connect(comboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(onCurrentIndexChanged(int)));
connect(this, SIGNAL(valueChanged(QString)), parent, SLOT(onComboBoxValueChanged(QString)));
m_comboBoxItems.insert(index.row(), items);
return comboBox;
} else if (index.column() == 1) { // 第二列用空白编辑器
return new QWidget(parent);
}
return QStyledItemDelegate::createEditor(parent, option, index);
}
void MyDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
if (QComboBox* comboBox = qobject_cast<QComboBox*>(editor)) {
comboBox->setCurrentText(index.data(Qt::EditRole).toString());
}
}
void MyDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const
{
if (QComboBox* comboBox = qobject_cast<QComboBox*>(editor)) {
model->setData(index, comboBox->currentText(), Qt::EditRole);
// 在第一列选中项改变时更新第二列的ComboBox
int row = index.row();
int column = index.column();
QStringList items = m_comboBoxItems.value(row);
QString selectedItem = comboBox->currentText();
if (!selectedItem.isEmpty()) {
// 如果此行第二列为空,添加一个新的comboBox
if (model->data(model->index(row, column+1)).toString().isEmpty()) {
QComboBox* newComboBox = new QComboBox(qobject_cast<QWidget*>(editor));
newComboBox->addItems(items);
connect(newComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(onCurrentIndexChanged(int)));
connect(this, SIGNAL(valueChanged(QString)), qobject_cast<QWidget*>(newComboBox)->parentWidget(),
SLOT(onComboBoxValueChanged(QString)));
model->setData(model->index(row, column+1), QVariant::fromValue<QWidget*>(newComboBox));
}
// 更新已有的comboBox的items
else {
QComboBox* existingBox = qvariant_cast<QWidget*>(model->data(model->index(row, column+1), Qt::EditRole));
if (existingBox != nullptr) {
existingBox->clear();
existingBox->addItems(items);
}
}
} else {
// 如果第一列选中项为空,将此行的第二列清空
model->setData(model->index(row, column+1), QVariant());
}
}
}
void MyDelegate::onCurrentIndexChanged(int index)
{
Q_UNUSED(index)
emit valueChanged(qobject_cast<QComboBox*>(sender())->currentText());
emit commitData(qobject_cast<QWidget*>(sender()));
emit closeEditor(qobject_cast<QWidget*>(sender()));
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
private slots:
void onComboBoxValueChanged(const QString& newValue);
private:
QTreeView *m_treeView;
};
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
m_treeView = new QTreeView(this);
QStandardItemModel *model = new QStandardItemModel(0, 2, this);
m_treeView->setModel(model);
MyDelegate *delegate = new MyDelegate(this);
m_treeView->setItemDelegate(delegate);
connect(delegate, SIGNAL(valueChanged(QString)), this, SLOT(onComboBoxValueChanged(QString)));
setCentralWidget(m_treeView);
}
void MainWindow::onComboBoxValueChanged(const QString& newValue)
{
qDebug() << "New value: " << newValue; // 在这里获取comboBox的新值并进行相应操作
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
#include "main.moc"
在自定义delegate类中,添加了一个valueChanged信号,并将comboBox的currentIndexChanged信号连接到该信号上。在MainWindow中,连接delegate的valueChanged信号到槽函数onComboBoxValueChanged。在onComboBoxValueChanged函数中获取comboBox的新值并进行相应操作。需要注意的是,在createEditor函数中,要将delegate的valueChanged信号连接到每个新创建的comboBox控件上,以便在其值发生改变时向MainWindow发送信息。