Merge CppTools into CppEditor

There was no proper separation of responsibilities between these
plugins. In particular, CppTools had lots of editor-related
functionality, so it's not clear why it was separated out in the first
place.
In fact, for a lot of code, it seemed quite arbitrary where it was put
(just one example: switchHeaderSource() was in CppTools, wheras
switchDeclarationDefinition() was in CppEditor).
Merging the plugins will enable us to get rid of various convoluted
pseudo-abstractions that were only introduced to keep up the artificial
separation.

Change-Id: Iafc3bce625b4794f6d4aa03df6cddc7f2d26716a
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppcodestylepreferencesfactory.cpp

@@ -0,0 +1,127 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "cppcodestylepreferencesfactory.h"
+
+#include "cppcodestylesettingspage.h"
+#include "cppcodestylepreferences.h"
+#include "cppeditorconstants.h"
+#include "cppqtstyleindenter.h"
+
+#include <QLayout>
+
+namespace CppEditor {
+
+static const char *defaultPreviewText =
+    "#include <math.h>\n"
+    "\n"
+    "class Complex\n"
+    "    {\n"
+    "public:\n"
+    "    Complex(double re, double im)\n"
+    "        : _re(re), _im(im)\n"
+    "        {}\n"
+    "    double modulus() const\n"
+    "        {\n"
+    "        return sqrt(_re * _re + _im * _im);\n"
+    "        }\n"
+    "private:\n"
+    "    double _re;\n"
+    "    double _im;\n"
+    "    };\n"
+    "\n"
+    "void bar(int i)\n"
+    "    {\n"
+    "    static int counter = 0;\n"
+    "    counter += i;\n"
+    "    }\n"
+    "\n"
+    "namespace Foo\n"
+    "    {\n"
+    "    namespace Bar\n"
+    "        {\n"
+    "        void foo(int a, int b)\n"
+    "            {\n"
+    "            for (int i = 0; i < a; i++)\n"
+    "                {\n"
+    "                if (i < b)\n"
+    "                    bar(i);\n"
+    "                else\n"
+    "                    {\n"
+    "                    bar(i);\n"
+    "                    bar(b);\n"
+    "                    }\n"
+    "                }\n"
+    "            }\n"
+    "        } // namespace Bar\n"
+    "    } // namespace Foo\n"
+    ;
+
+
+CppCodeStylePreferencesFactory::CppCodeStylePreferencesFactory() = default;
+
+Utils::Id CppCodeStylePreferencesFactory::languageId()
+{
+    return Constants::CPP_SETTINGS_ID;
+}
+
+QString CppCodeStylePreferencesFactory::displayName()
+{
+    return QString::fromUtf8(Constants::CPP_SETTINGS_NAME);
+}
+
+TextEditor::ICodeStylePreferences *CppCodeStylePreferencesFactory::createCodeStyle() const
+{
+    return new CppCodeStylePreferences();
+}
+
+QWidget *CppCodeStylePreferencesFactory::createEditor(TextEditor::ICodeStylePreferences *preferences,
+                                                           QWidget *parent) const
+{
+    auto cppPreferences = qobject_cast<CppCodeStylePreferences *>(preferences);
+    if (!cppPreferences)
+        return nullptr;
+    auto widget = new Internal::CppCodeStylePreferencesWidget(parent);
+    widget->layout()->setContentsMargins(0, 0, 0, 0);
+    widget->setCodeStyle(cppPreferences);
+    return widget;
+}
+
+TextEditor::Indenter *CppCodeStylePreferencesFactory::createIndenter(QTextDocument *doc) const
+{
+    return new CppQtStyleIndenter(doc);
+}
+
+QString CppCodeStylePreferencesFactory::snippetProviderGroupId() const
+{
+    return QString(CppEditor::Constants::CPP_SNIPPETS_GROUP_ID);
+}
+
+QString CppCodeStylePreferencesFactory::previewText() const
+{
+    return QLatin1String(defaultPreviewText);
+}
+
+} // namespace CppEditor