Add new ModelEditor plugin.

The plugin is based on the 'modelinglib' library. For features and
screenshots see https://wiki.qt.io/ModelEditor

Change-Id: I857be0652a852cc69a9729f64e67134fe630af00
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/modeleditor/modeleditor.cpp

@@ -0,0 +1,84 @@
+/***************************************************************************
+**
+** Copyright (C) 2015 Jochen Becher
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company.  For licensing terms and
+** conditions see http://www.qt.io/terms-conditions.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "modeleditor.h"
+
+#include "modeleditor_constants.h"
+#include "modeldocument.h"
+#include "extdocumentcontroller.h"
+
+#include "qmt/diagram_ui/diagramsmanager.h"
+#include "qmt/model/mcanvasdiagram.h"
+#include "qmt/model_controller/modelcontroller.h"
+
+#include <QFileInfo>
+
+namespace ModelEditor {
+namespace Internal {
+
+class ModelEditor::ModelEditorPrivate
+{
+public:
+    ModelDocument *document = 0;
+};
+
+ModelEditor::ModelEditor(UiController *uiController, ActionHandler *actionHandler, QWidget *parent)
+    : AbstractEditor(uiController, actionHandler, parent),
+      d(new ModelEditorPrivate)
+{
+    setContext(Core::Context(Constants::MODEL_EDITOR_ID));
+    d->document = new ModelDocument(this);
+    connect(d->document, &ModelDocument::contentSet, this, &ModelEditor::onContentSet);
+    init(parent);
+}
+
+ModelEditor::~ModelEditor()
+{
+    delete d;
+}
+
+Core::IDocument *ModelEditor::document()
+{
+    return d->document;
+}
+
+void ModelEditor::onContentSet()
+{
+    setDocument(d->document);
+
+    // open diagram
+    qmt::MDiagram *rootDiagram = d->document->documentController()->findOrCreateRootDiagram();
+    showDiagram(rootDiagram);
+
+    expandModelTreeToDepth(0);
+}
+
+} // namespace Internal
+} // namespace ModelEditor