New QmlDesigner plugin & Design mode

This adds a new "Design" mode that can be used to manipulate qml files
in a visual way. It will only get build if you have the declarativeui
module in Qt.

This is a squashed import from the Bauhaus project. Share & enjoy :)

src/plugins/qmldesigner/components/integration/componentaction.cpp

@@ -0,0 +1,74 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "componentaction.h"
+
+#include <QComboBox>
+#include "componentview.h"
+#include <QStandardItemModel>
+#include <QtDebug>
+
+namespace QmlDesigner {
+
+ComponentAction::ComponentAction(QObject *parent)
+  :  QWidgetAction(parent),
+     m_componentView(new ComponentView(this))
+{
+}
+
+void ComponentAction::setModel(Model* model)
+{
+    if (model == m_componentView->model())
+        return;
+
+    blockSignals(true);
+
+    if (model)
+        model->attachView(m_componentView.data());
+    else if (m_componentView->model())
+        m_componentView->model()->detachView(m_componentView.data());
+
+    blockSignals(false);
+}
+
+QWidget  *ComponentAction::createWidget(QWidget *parent)
+{
+    QComboBox *comboBox = new QComboBox(parent);
+    comboBox->setModel(m_componentView->standardItemModel());
+    connect(comboBox, SIGNAL(currentIndexChanged(int)), SLOT(emitCurrentComponentChanged(int)));
+
+    return comboBox;
+}
+
+void ComponentAction::emitCurrentComponentChanged(int index)
+{
+    emit currentComponentChanged(m_componentView->modelNode(index));
+}
+
+} // namespace QmlDesigner