C++ 获取QTableView表格内容修改事件-QT开发中文网

可以使用QItemDelegate来监测和处理QTableView中表格内容的修改事件。具体步骤如下：

1.创建自定义的ItemDelegate类，继承自QItemDelegate。在其中重写createEditor()、setEditorData()和setModelData()方法，分别用于创建编辑器、设置编辑器显示的数据和将编辑器数据保存到模型中。

2.在需要监测表格内容修改事件的类中，创建QItemDelegate实例并设置给对应的QTableView对象。通过监听dataChanged信号，即可获取到修改后的数据及其对应的模型索引。

以下是示例代码：

//CustomItemDelegate.h

#include

class CustomItemDelegate : public QItemDelegate {

Q_OBJECT

public:

CustomItemDelegate(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 dataChanged(const QModelIndex &index);

private slots:

void commitAndCloseEditor();

};

//CustomItemDelegate.cpp

#include “CustomItemDelegate.h” #include #include

CustomItemDelegate::CustomItemDelegate(QObject *parent)

: QItemDelegate(parent)

{ }

QWidget* CustomItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {

QLineEdit *editor = new QLineEdit(parent);
connect(editor, &QLineEdit::editingFinished, this, &CustomItemDelegate::commitAndCloseEditor);
return editor;

}

void CustomItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const {

QString value = index.model()->data(index, Qt::EditRole).toString();
QLineEdit *lineEdit = static_cast<QLineEdit*>(editor);
lineEdit->setText(value);

}

void CustomItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const {

QLineEdit *lineEdit = static_cast<QLineEdit*>(editor);
QString value = lineEdit->text();
model->setData(index, value, Qt::EditRole);

}

void CustomItemDelegate::commitAndCloseEditor() {

QLineEdit *editor = qobject_cast<QLineEdit*>(sender());
emit dataChanged(qobject_cast<QLineEdit*>(sender())->parentIndex());
commitData(editor);
closeEditor(editor, QAbstractItemDelegate::EditNextItem);

}

//MyTableView.h

#include

class MyTableView : public QTableView {

Q_OBJECT

public:

MyTableView(QWidget *parent = nullptr);

protected:

void setModel(QAbstractItemModel *model) override;

private slots:

void onDataChanged(const QModelIndex &index);

private:

CustomItemDelegate *m_delegate;

};

//MyTableView.cpp

#include “MyTableView.h” #include

MyTableView::MyTableView(QWidget *parent)

: QTableView(parent)

{

m_delegate = new CustomItemDelegate(this);
connect(m_delegate, &CustomItemDelegate::dataChanged, this, &MyTableView::onDataChanged);

}

void MyTableView::setModel(QAbstractItemModel *model) {

QTableView::setModel(model);
for(int i=0; i<model->rowCount(); ++i){
    for(int j=0; j<model->columnCount(); ++j){
        QModelIndex index = model->index(i, j);
        setIndexWidget(index, m_delegate->createEditor(this, {}, index));
    }
}

}

void MyTableView::onDataChanged(const QModelIndex &index) {

qDebug() << "Row:" << index.row() << ", Column:" << index.column() << ", Value:" << index.data();

}

int main(int argc, char *argv[]) {

QApplication a(argc, argv);

QStandardItemModel *model = new QStandardItemModel(3, 2);
model->setData(model->index(0, 0), "A");
model->setData(model->index(0, 1), "B");
model->setData(model->index(1, 0), "C");
model->setData(model->index(1, 1), "D");
model->setData(model->index(2, 0), "E");
model->setData(model->index(2, 1), "F");

MyTableView *tableView = new MyTableView;
tableView->setModel(model);
tableView->show();

return a.exec();

}