Convert "extension" dialog example into snippets

Pick-to: 6.5
Task-number: QTBUG-108751
Change-Id: I8ca4e058b832674dc0c8b84024cb70a667ee8db4
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/widgets/doc/snippets/dialogs/dialogs.cpp b/src/widgets/doc/snippets/dialogs/dialogs.cpp
index 441ca8f795..16b136df4b 100644
--- a/src/widgets/doc/snippets/dialogs/dialogs.cpp
+++ b/src/widgets/doc/snippets/dialogs/dialogs.cpp
@@ -227,6 +227,33 @@ void Operation::cancel()
 }
 //! [6]
 
+void extension()
+{
+    using ExtendedControls = QWidget;
+    QPushButton *findButton;
+    QPushButton *moreButton;
+    QWidget *extension;
+    QVBoxLayout *mainLayout;
+
+//! [extension]
+    findButton = new QPushButton(tr("&Find"));
+    moreButton = new QPushButton(tr("&More..."));
+    moreButton->setCheckable(true);
+
+    extension = new ExtendedControls;
+    mainLayout->addWidget(extension);
+    extension->hide();
+
+    connect(moreButton, &QAbstractButton::toggled, extension, &QWidget::setVisible);
+//! [extension]
+
+//! [buttonbox]
+    QDialogButtonBox *buttonBox = new QDialogButtonBox(Qt::Vertical);
+    buttonBox->addButton(findButton, QDialogButtonBox::ActionRole);
+    buttonBox->addButton(moreButton, QDialogButtonBox::ActionRole);
+//! [buttonbox]
+}
+
 int main()
 {
 }