TextEditor: Merge some "assist" related classes

Simplifies the code base by removing one level of unused
and unneeded abstraction.

- Merge {I,Default}AssistInterface to AssistInterface
- Merge {IAssist,Basic}ProposalItem to AssistProposalItem
- Merge {IGenericProposal,BasicProposalItemList}Model to GenericProposalModel

Change-Id: I54ee7b095427383d67a00fc1d87c3808c21d812d
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/texteditor/codeassist/assistinterface.h

@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 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 IASSISTINTERFACE_H
+#define IASSISTINTERFACE_H
+
+#include "assistenums.h"
+
+#include <texteditor/texteditor_global.h>
+
+#include <utils/qtcoverride.h>
+
+#include <QString>
+
+QT_BEGIN_NAMESPACE
+class QTextDocument;
+QT_END_NAMESPACE
+
+namespace TextEditor {
+
+class TEXTEDITOR_EXPORT AssistInterface
+{
+public:
+    AssistInterface(QTextDocument *textDocument,
+                    int position,
+                    const QString &fileName,
+                    AssistReason reason);
+    virtual ~AssistInterface();
+
+    virtual int position() const { return m_position; }
+    virtual QChar characterAt(int position) const;
+    virtual QString textAt(int position, int length) const;
+    virtual QString fileName() const { return m_fileName; }
+    virtual QTextDocument *textDocument() const { return m_textDocument; }
+    virtual void prepareForAsyncUse();
+    virtual void recreateTextDocument();
+    virtual AssistReason reason() const;
+
+private:
+    QTextDocument *m_textDocument;
+    bool m_isAsync;
+    int m_position;
+    QString m_fileName;
+    AssistReason m_reason;
+    QString m_text;
+};
+
+} // namespace TextEditor
+
+#endif // IASSISTINTERFACE_H