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

widgets/RefactorWidget.hpp

@@ -0,0 +1,141 @@
+/* 
+ * 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 <QWidget>
+#include <QPushButton>
+#include <QLabel>
+#include <QVBoxLayout>
+#include <QKeyEvent>
+#include <QEnterEvent>
+#include <QSharedPointer>
+#include <QSplitter>
+#include <QSplitterHandle>
+#include <functional>
+
+#include <texteditor/texteditor.h>
+#include <utils/textutils.h>
+#include <utils/differ.h>
+
+namespace QodeAssist {
+
+class CustomSplitterHandle : public QSplitterHandle
+{
+    Q_OBJECT
+public:
+    explicit CustomSplitterHandle(Qt::Orientation orientation, QSplitter *parent);
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void enterEvent(QEnterEvent *event) override;
+    void leaveEvent(QEvent *event) override;
+private:
+    bool m_hovered = false;
+};
+
+class CustomSplitter : public QSplitter
+{
+    Q_OBJECT
+public:
+    explicit CustomSplitter(Qt::Orientation orientation, QWidget *parent = nullptr);
+protected:
+    QSplitterHandle *createHandle() override;
+};
+
+class RefactorWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit RefactorWidget(TextEditor::TextEditorWidget *sourceEditor, QWidget *parent = nullptr);
+    ~RefactorWidget() override;
+
+    void setDiffContent(const QString &originalText, const QString &refactoredText);
+    void setDiffContent(const QString &originalText, const QString &refactoredText,
+                        const QString &contextBefore, const QString &contextAfter);
+    
+    void setApplyText(const QString &text) { m_applyText = text; }
+    void setRange(const Utils::Text::Range &range);
+    void setEditorWidth(int width);
+    
+    QString getRefactoredText() const;
+    
+    void setApplyCallback(std::function<void(const QString &)> callback);
+    void setDeclineCallback(std::function<void()> callback);
+
+signals:
+    void applied();
+    void declined();
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    bool event(QEvent *event) override;
+    void closeEvent(QCloseEvent *event) override;
+
+private slots:
+    void syncLeftScroll(int value);
+    void syncRightScroll(int value);
+    void syncLeftHorizontalScroll(int value);
+    void syncRightHorizontalScroll(int value);
+    void onRightEditorTextChanged();
+
+private:
+    TextEditor::TextEditorWidget *m_sourceEditor;
+    TextEditor::TextEditorWidget *m_leftEditor;
+    TextEditor::TextEditorWidget *m_rightEditor;
+    QSharedPointer<TextEditor::TextDocument> m_leftDocument;
+    QSharedPointer<TextEditor::TextDocument> m_rightDocument;
+    QWidget *m_leftContainer;
+    QSplitter *m_splitter;
+    QLabel *m_statsLabel;
+    QPushButton *m_applyButton;
+    QPushButton *m_declineButton;
+    
+    QString m_originalText;
+    QString m_refactoredText;
+    QString m_applyText;
+    QString m_contextBefore;
+    QString m_contextAfter;
+    Utils::Text::Range m_range;
+    int m_editorWidth;
+    bool m_syncingScroll;
+    bool m_isClosing;
+    int m_linesAdded;
+    int m_linesRemoved;
+    
+    QList<Utils::Diff> m_cachedDiffList;
+    
+    std::function<void(const QString &)> m_applyCallback;
+    std::function<void()> m_declineCallback;
+
+    void setupUi();
+    void applyRefactoring();
+    void declineRefactoring();
+    void updateSizeToContent();
+    void highlightDifferences();
+    void dimContextLines(const QString &contextBefore, const QString &contextAfter);
+    void calculateStats();
+    void updateStatsLabel();
+    void applySyntaxHighlighting();
+    void addLineMarkers();
+    void applyEditorSettings();
+    void updateButtonStyles();
+};
+
+} // namespace QodeAssist