如何为 QTableWidget 添加自动完成

Question

我想做的是开始在表格单元格中键入一些数据，它显示了完成建议，但到目前为止还没有成功。

我尝试在单元格中添加QLineEdit，但是有没有办法在不使用QLineEdit作为cellWidget的情况下完成此操作？

编辑：

通过重写QItemDelegate类使其工作

Autocomplete_Delegate.h

#include <QItemDelegate>
#include <QModelIndex>
#include <QLineEdit>
#include <QCompleter>
class Autocomplete_Delegate : public QItemDelegate {
public:
Autocomplete_Delegate(QObject *parent, QStringList model);
~Autocomplete_Delegate();
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
void setEditorData(QWidget *editor, const QModelIndex &index) const override;
private:
QStringList model;
};

Autocomplete_Delegate...cpp

Autocomplete_Delegate::Autocomplete_Delegate(QObject *parent, QStringList model) : QItemDelegate(parent), model(model) {}
Autocomplete_Delegate::~Autocomplete_Delegate() {
model.clear();
}
QWidget *Autocomplete_Delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {
QWidget *editor = QItemDelegate::createEditor(parent, option, index); //* Create the editor so it looks native to the tablewidget
QLineEdit *lineEdit = static_cast<QLineEdit*>(editor); //* create a linedit so it behaves like a line edit and cast the editor to line edit
QCompleter *completer = new QCompleter(model, parent); //* make a completer and pass in the wordlist
completer->setCaseSensitivity(Qt::CaseInsensitive); //* set the case senstivity
lineEdit->setCompleter(completer); //* set the completor on line edit
return lineEdit;
}
void Autocomplete_Delegate::setEditorData(QWidget *editor, const QModelIndex &index) const {
QString data = index.model()->data(index, Qt::EditRole).toString(); //* get the data from the model -> the cell
QLineEdit *lineEdit = static_cast<QLineEdit*>(editor);
lineEdit->setText(data); //* set the data in the editor
}

感谢@eyllanesc的想法。

Answer 1

您可以使用与 QTableWidgetItem 关联的角色，并使用委托创建 QCompleter，在其中建立和更新模型。

#include <QtWidgets>
enum CustomRoles{
ListCompleterRole = Qt::UserRole + 1000
};
class CompletedDelegate: public QStyledItemDelegate{
public:
using QStyledItemDelegate::QStyledItemDelegate;
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const{
QWidget* editor = QStyledItemDelegate::createEditor(parent, option, index);
if(QLineEdit *le = qobject_cast<QLineEdit *>(editor)){
QStringListModel *model = new QStringListModel(le);
QCompleter *completer = new QCompleter(le);
completer->setModel(model);
le->setCompleter(completer);
}
return editor;
}
void setEditorData(QWidget *editor, const QModelIndex &index) const{
QStyledItemDelegate::setEditorData(editor, index);
if(QLineEdit *le = qobject_cast<QLineEdit *>(editor)){
if(QCompleter *completer = le->completer()){
if(QStringListModel *model = qobject_cast<QStringListModel *>(completer->model())){
QVariant v = index.data(CustomRoles::ListCompleterRole);
if (v.canConvert<QStringList>()){
QStringList options = v.value<QStringList>();
model->setStringList(options);
}
}
}
}
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QStringList words = {
"astonishing", 
"agreement", 
"appeal", 
"autonomy", 
"accompany", 
"articulate", 
"article", 
"amuse", 
"advertise",
"admiration"
};
QTableWidget w(1, 1);
CompletedDelegate *delegate = new CompletedDelegate(&w);
w.setItemDelegate(delegate);
QTableWidgetItem *item = new QTableWidgetItem;
item->setData(CustomRoles::ListCompleterRole, words); // update options
w.setItem(0, 0, item);
w.show();
return a.exec();
}