C++: add code-model settings to choose one by mime-type.

The model-manager now supports multiple code models for semantic
highlighting and code completion, and will choose one based on the
mime-type of the editor.

The settings page is currently disabled. It will get enabled when a
second plug-in lands that has a ModelManagerSupport class.

Change-Id: I10023f52322ed6860397da15dba1c231e80e6517
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cpptools/cppcodemodelsettings.h

@@ -0,0 +1,75 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 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.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef CPPTOOLS_INTERNAL_CPPCODEMODELSETTINGS_H
+#define CPPTOOLS_INTERNAL_CPPCODEMODELSETTINGS_H
+
+#include <QHash>
+#include <QList>
+#include <QSettings>
+#include <QString>
+
+namespace CppTools {
+
+class ModelManagerSupport;
+
+namespace Internal {
+
+class CppCodeModelSettings
+{
+    QHash<QString, QString> m_modelManagerSupportByMimeType;
+    QHash<QString, QString> m_availableModelManagerSupportersByName;
+    QString m_defaultId;
+
+public:
+    void fromSettings(QSettings *s);
+    void toSettings(QSettings *s);
+
+    void setModelManagerSupports(const QList<ModelManagerSupport *> &supporters);
+
+    QString &modelManagerSupportId(const QString &mimeType)
+    { return m_modelManagerSupportByMimeType[mimeType]; }
+
+    const QHash<QString, QString> &availableModelManagerSupportersByName() const
+    { return m_availableModelManagerSupportersByName; }
+
+    QString defaultId() const
+    { return m_defaultId; }
+
+    void setDefaultId(const QString &defaultId)
+    { m_defaultId = defaultId; }
+
+private:
+    void setIdForMimeType(const QVariant &var, const QString &mimeType);
+};
+
+} // namespace Internal
+} // namespace CppTools
+
+#endif // CPPTOOLS_INTERNAL_CPPCODEMODELSETTINGS_H