C++: Synchronize function decl/def refactoring.

When editing a function declaration or definition the code model
may realize the same changes have to be applied somewhere else. A
refactoring marker will pop up that can be clicked to perform the
changes. Alternatively, press enter to apply.

Change-Id: I2299a2ecfb6a8f87d4853fc7cfa99486f890a1d3
Reviewed-on: http://codereview.qt.nokia.com/2909
Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>

src/plugins/cppeditor/cppfunctiondecldeflink.h

@@ -0,0 +1,121 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#ifndef CPPFUNCTIONDECLDEFLINK_H
+#define CPPFUNCTIONDECLDEFLINK_H
+
+#include <cplusplus/CppDocument.h>
+#include <cplusplus/ASTfwd.h>
+
+#include <cpptools/cpprefactoringchanges.h>
+#include <utils/changeset.h>
+
+#include <QtCore/QString>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QSharedPointer>
+#include <QtCore/QFutureWatcher>
+#include <QtGui/QTextCursor>
+
+namespace CppEditor {
+namespace Internal {
+
+class CPPEditorWidget;
+class FunctionDeclDefLink;
+
+class FunctionDeclDefLinkFinder : public QObject
+{
+    Q_OBJECT
+public:
+    FunctionDeclDefLinkFinder(QObject *parent = 0);
+
+    void startFindLinkAt(QTextCursor cursor,
+                    const CPlusPlus::Document::Ptr &doc,
+                    const CPlusPlus::Snapshot &snapshot);
+
+    QTextCursor scannedSelection() const;
+
+signals:
+    void foundLink(QSharedPointer<FunctionDeclDefLink> link);
+
+private slots:
+    void onFutureDone();
+
+private:
+    QTextCursor m_scannedSelection;
+    QFutureWatcher<QSharedPointer<FunctionDeclDefLink> > m_watcher;
+};
+
+class FunctionDeclDefLink
+{
+    Q_DECLARE_TR_FUNCTIONS(FunctionDeclDefLink)
+    Q_DISABLE_COPY(FunctionDeclDefLink)
+public:
+    ~FunctionDeclDefLink();
+
+    class Marker {};
+
+    bool isValid() const;
+    bool isMarkerVisible() const;
+
+    void apply(CPPEditorWidget *editor, bool jumpToMatch);
+    void hideMarker(CPPEditorWidget *editor);
+    void showMarker(CPPEditorWidget *editor);
+    Utils::ChangeSet changes(const CPlusPlus::Snapshot &snapshot);
+
+    QTextCursor linkSelection;
+    int targetOffset;
+    QString targetInitial;
+
+    CPlusPlus::Document::Ptr sourceDocument;
+    CPlusPlus::Function *sourceFunction;
+    CPlusPlus::DeclarationAST *sourceDeclaration;
+    CPlusPlus::FunctionDeclaratorAST *sourceFunctionDeclarator;
+
+    QSharedPointer<CppTools::CppRefactoringFile> targetFile;
+    CPlusPlus::Function *targetFunction;
+    CPlusPlus::DeclarationAST *targetDeclaration;
+    CPlusPlus::FunctionDeclaratorAST *targetFunctionDeclarator;
+
+private:
+    FunctionDeclDefLink();
+
+    bool hasMarker;
+
+    friend class FunctionDeclDefLinkFinder;
+};
+
+} // namespace Internal
+} // namespace CppEditor
+
+Q_DECLARE_METATYPE(CppEditor::Internal::FunctionDeclDefLink::Marker)
+
+#endif // CPPFUNCTIONDECLDEFLINK_H