我有QComboBox作爲QTableWidget項目delegeate編輯器的問題。 QTableWidget使用SqlTypeDelegate作爲項目委託。QComboBox不顯示其項目列表
當我在QGraphicsScene(通過QGraphicsProxyWidget)中繪製QTableWidget時,QComboBox彈出可用項目列表不顯示。 但是,如果我使用QTableWidget作爲普通窗口小部件(不通過QGraphicsScene \ View繪製),那麼QComboBox的行爲是正常的 - 它顯示項目列表。
我該如何強制QComboBox顯示其項目列表?
下面的示例代碼:
main.cpp中:
#include <QtGui/QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QTableWidget>
#include "sqltypedelegate.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QGraphicsScene scene;
QTableWidget *table = new QTableWidget(4,2);
table->setItemDelegate(new SqlTypeDelegate(table));
QGraphicsProxyWidget *proxy = scene.addWidget(table);
QGraphicsView view(&scene);
view.show();
return app.exec();
}
sqltypedelegate.h:
#include <QItemDelegate>
#include <QStyledItemDelegate>
#include <QModelIndex>
#include <QObject>
#include <QSize>
#include <QComboBox>
class SqlTypeDelegate : public QItemDelegate
{
Q_OBJECT
public:
SqlTypeDelegate(QObject *parent = 0);
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
const QModelIndex &index) const;
void setEditorData(QWidget *editor, const QModelIndex &index) const;
void setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const;
void updateEditorGeometry(QWidget *editor,
const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
sqltypedelegate.cpp:
#include <QtGui>
#include "sqltypedelegate.h"
SqlTypeDelegate::SqlTypeDelegate(QObject *parent)
: QItemDelegate(parent)
{}
QWidget *SqlTypeDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem &/* option */,
const QModelIndex &/* index */) const
{
QComboBox *editor = new QComboBox(parent);
editor->addItem(QString("decimal(50)"));
editor->addItem(QString("integer"));
editor->addItem(QString("varchar(50)"));
editor->addItem(QString("char"));
editor->setEditable(true);
return editor;
}
void SqlTypeDelegate::setEditorData(QWidget *editor,
const QModelIndex &index) const
{
QString value = index.model()->data(index, Qt::EditRole).toString();
QComboBox *comboBox = static_cast<QComboBox*>(editor);
comboBox->setEditText(value);
}
void SqlTypeDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const
{
QComboBox *comboBox = static_cast<QComboBox*>(editor);
model->setData(index, comboBox->currentText(), Qt::EditRole);
}
void SqlTypeDelegate::updateEditorGeometry(QWidget *editor,
const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
QComboBox *comboBox = static_cast<QComboBox*>(editor);
comboBox->setGeometry(option.rect);
}
你確定這可以嗎?在Python(PyQt4)中,我從來沒有得到過'QEvent :: MOuseButtonRelease',所以所有的'comboBox'事件都被過濾掉了。我認爲這是造成問題的'comboBox'的'QtCore.QEvent.FocusOut'。 – Onlyjus