Editors: Refactor indenters out of the editors for better reusability.

Reviewed-by: ckamm

src/plugins/cppeditor/cppqtstyleindenter.cpp

@@ -0,0 +1,116 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 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 "cppqtstyleindenter.h"
+
+#include <cpptools/cppcodeformatter.h>
+#include <texteditor/basetexteditor.h>
+#include <texteditor/tabsettings.h>
+
+#include <QtCore/QChar>
+#include <QtGui/QTextDocument>
+#include <QtGui/QTextBlock>
+#include <QtGui/QTextCursor>
+
+using namespace CppEditor;
+using namespace Internal;
+
+CppQtStyleIndenter::CppQtStyleIndenter()
+{}
+
+CppQtStyleIndenter::~CppQtStyleIndenter()
+{}
+
+bool CppQtStyleIndenter::doIsElectricalCharacter(const QChar &ch) const
+{
+    if (ch == QLatin1Char('{') ||
+        ch == QLatin1Char('}') ||
+        ch == QLatin1Char(':') ||
+        ch == QLatin1Char('#')) {
+        return true;
+    }
+    return false;
+}
+
+void CppQtStyleIndenter::doIndentBlock(QTextDocument *doc,
+                                       const QTextBlock &block,
+                                       const QChar &typedChar,
+                                       TextEditor::BaseTextEditor *editor)
+{
+    Q_UNUSED(doc)
+
+    const TextEditor::TabSettings &ts = editor->tabSettings();
+    CppTools::QtStyleCodeFormatter codeFormatter(ts);
+
+    codeFormatter.updateStateUntil(block);
+    int indent;
+    int padding;
+    codeFormatter.indentFor(block, &indent, &padding);
+
+    // only reindent the current line when typing electric characters if the
+    // indent is the same it would be if the line were empty
+    if (isElectricCharacter(typedChar)) {
+        int newlineIndent;
+        int newlinePadding;
+        codeFormatter.indentForNewLineAfter(block.previous(), &newlineIndent, &newlinePadding);
+        if (ts.indentationColumn(block.text()) != newlineIndent + newlinePadding)
+            return;
+    }
+
+    ts.indentLine(block, indent + padding, padding);
+}
+
+void CppQtStyleIndenter::doIndent(QTextDocument *doc,
+                                  const QTextCursor &cursor,
+                                  const QChar &typedChar,
+                                  TextEditor::BaseTextEditor *editor)
+{
+    if (cursor.hasSelection()) {
+        QTextBlock block = doc->findBlock(cursor.selectionStart());
+        const QTextBlock end = doc->findBlock(cursor.selectionEnd()).next();
+
+        const TextEditor::TabSettings &ts = editor->tabSettings();
+        CppTools::QtStyleCodeFormatter codeFormatter(ts);
+        codeFormatter.updateStateUntil(block);
+
+        QTextCursor tc = editor->textCursor();
+        tc.beginEditBlock();
+        do {
+            int indent;
+            int padding;
+            codeFormatter.indentFor(block, &indent, &padding);
+            ts.indentLine(block, indent + padding, padding);
+            codeFormatter.updateLineStateChange(block);
+            block = block.next();
+        } while (block.isValid() && block != end);
+        tc.endEditBlock();
+    } else {
+        indentBlock(doc, cursor.block(), typedChar, editor);
+    }
+}