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3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Designer of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:GPL-EXCEPT$
9** Commercial License Usage
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27****************************************************************************/
28
29#include "default_layoutdecoration.h"
30#include "qlayout_widget_p.h"
31
32#include <layoutinfo_p.h>
33
34#include <QtDesigner/abstractmetadatabase.h>
35#include <QtDesigner/abstractformwindow.h>
36#include <QtDesigner/abstractformeditor.h>
37
38QT_BEGIN_NAMESPACE
39
40namespace qdesigner_internal {
41
42// ---- QDesignerLayoutDecorationFactory ----
43QDesignerLayoutDecorationFactory::QDesignerLayoutDecorationFactory(QExtensionManager *parent)
44 : QExtensionFactory(parent)
45{
46}
47
48QObject *QDesignerLayoutDecorationFactory::createExtension(QObject *object, const QString &iid, QObject *parent) const
49{
50 if (!object->isWidgetType() || iid != Q_TYPEID(QDesignerLayoutDecorationExtension))
51 return nullptr;
52
53 QWidget *widget = qobject_cast<QWidget*>(o: object);
54
55 if (const QLayoutWidget *layoutWidget = qobject_cast<const QLayoutWidget*>(object: widget))
56 return QLayoutSupport::createLayoutSupport(formWindow: layoutWidget->formWindow(), widget, parent);
57
58 if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(w: widget))
59 if (LayoutInfo::managedLayout(core: fw->core(), widget))
60 return QLayoutSupport::createLayoutSupport(formWindow: fw, widget, parent);
61
62 return nullptr;
63}
64}
65
66QT_END_NAMESPACE
67

source code of qttools/src/designer/src/components/formeditor/default_layoutdecoration.cpp