feat: Add side by side refactor widget (#276)

widgets/RefactorWidgetHandler.hpp

@@ -0,0 +1,75 @@
+/* 
+ * Copyright (C) 2025 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <QPointer>
+#include <functional>
+
+#include <texteditor/texteditor.h>
+#include <utils/textutils.h>
+
+namespace QodeAssist {
+
+class RefactorWidget;
+
+class RefactorWidgetHandler : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit RefactorWidgetHandler(QObject *parent = nullptr);
+    ~RefactorWidgetHandler() override;
+
+    void showRefactorWidget(
+        TextEditor::TextEditorWidget *editor,
+        const QString &originalText,
+        const QString &refactoredText,
+        const Utils::Text::Range &range);
+    
+    void showRefactorWidget(
+        TextEditor::TextEditorWidget *editor,
+        const QString &originalText,
+        const QString &refactoredText,
+        const Utils::Text::Range &range,
+        const QString &contextBefore,
+        const QString &contextAfter);
+    
+    void hideRefactorWidget();
+    
+    bool isWidgetVisible() const { return !m_refactorWidget.isNull(); }
+
+    void setApplyCallback(std::function<void(const QString &)> callback);
+    void setDeclineCallback(std::function<void()> callback);
+    void setTextToApply(const QString &text);
+
+private:
+    QPointer<TextEditor::TextEditorWidget> m_editor;
+    QPointer<RefactorWidget> m_refactorWidget;
+    
+    std::function<void(const QString &)> m_applyCallback;
+    std::function<void()> m_declineCallback;
+
+    void updateWidgetPosition();
+    QPoint calculateWidgetPosition();
+    int getEditorWidth() const;
+};
+
+} // namespace QodeAssist
+