qt 6.5.1 original

tests/manual/widgets/itemviews/delegate/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## delegate Binary:
+#####################################################################
+
+qt_internal_add_manual_test(delegate
+    GUI
+    SOURCES
+        example.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::Widgets
+)

tests/manual/widgets/itemviews/delegate/delegate.pro

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+TEMPLATE = app
+QT += widgets
+SOURCES=example.cpp

tests/manual/widgets/itemviews/delegate/example.cpp

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+// Copyright (C) 2012 Thorbjørn Lund Martsum - tmartsum[at]gmail.com
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QLineEdit>
+#include <QApplication>
+#include <QTableView>
+#include <QStandardItemModel>
+#include <QItemDelegate>
+#include <QDebug>
+#include <QComboBox>
+
+class ExampleEditor : public QLineEdit
+{
+public:
+    ExampleEditor(QWidget *parent = nullptr):QLineEdit(parent) { qDebug() << "ctor"; }
+    ~ExampleEditor() { QApplication::instance()->quit(); }
+};
+
+class ExampleDelegate : public QItemDelegate
+{
+public:
+    ExampleDelegate() : QItemDelegate()
+    {
+        m_editor = new ExampleEditor(0);
+        m_combobox = new QComboBox(0);
+        m_combobox->addItem(QString::fromUtf8("item1"));
+        m_combobox->addItem(QString::fromUtf8("item2"));
+    }
+protected:
+    QWidget* createEditor(QWidget *p, const QStyleOptionViewItem &o, const QModelIndex &i) const
+    {
+        // doubleclick rownumber 3 (last row) to see the difference.
+        if (i.row() == 3) {
+            m_combobox->setParent(p);
+            m_combobox->setGeometry(o.rect);
+            return m_combobox;
+        } else {
+            m_editor->setParent(p);
+            m_editor->setGeometry(o.rect);
+            return m_editor;
+        }
+    }
+    void destroyEditor(QWidget *editor, const QModelIndex &) const
+    {
+        editor->setParent(0);
+        qDebug() << "intercepted destroy :)";
+    }
+
+    // Avoid setting data - and therefore show that the editor keeps its state.
+    void setEditorData(QWidget* w, const QModelIndex &) const
+    {
+        QComboBox *combobox = qobject_cast<QComboBox*>(w);
+        if (combobox) {
+            qDebug() << "Try to show popup at once";
+            // Now we could try to make a call to
+            // QCoreApplication::processEvents();
+            // But it does not matter. The fix:
+            // https://codereview.qt-project.org/40608
+            // is blocking QComboBox from reacting to this doubleclick edit event
+            // and we need to do that since the mouseReleaseEvent has not yet happened,
+            // and therefore cannot be processed.
+            combobox->showPopup();
+        }
+    }
+
+    ~ExampleDelegate() { delete m_editor; }
+    mutable ExampleEditor *m_editor;
+    mutable QComboBox *m_combobox;
+};
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    QTableView tv;
+    QStandardItemModel m;
+    m.setRowCount(4);
+    m.setColumnCount(2);
+    tv.setModel(&m);
+    tv.show();
+    tv.setItemDelegate(new ExampleDelegate());
+    app.exec();
+}