初始化：图形化界面骨架（文件选择、语法高亮、自动缩进、查找/替换）

ui/codeeditorwidget.h

@@ -0,0 +1,132 @@
+#pragma once
+
+#include <QWidget>
+#include <QPlainTextEdit>
+#include <QColor>
+#include <QHash>
+#include <QVector>
+#include <QSet>
+#include <QStringList>
+#include <QTextCursor>
+
+
+
+class LineNumberArea;
+class CSyntaxHighlighter;
+class CompletionPopup;
+class FindReplaceBar;
+
+// 每个字符的背景信息
+struct CharBackgroundInfo
+{
+    int   column = 0;    // 这一行中的列号（从 0 开始）
+    QColor color;
+    qreal alpha = 1.0;   // 0.0 ~ 1.0
+};
+
+// 每一行的背景信息
+struct LineBackgroundInfo
+{
+    QColor color;
+    qreal alpha = 1.0;   // 0.0 ~ 1.0
+};
+
+// 真正的代码编辑器，继承 QPlainTextEdit
+class CodeEditor : public QPlainTextEdit
+{
+    Q_OBJECT
+public:
+    explicit CodeEditor(QWidget *parent = nullptr);
+
+    int lineNumberAreaWidth() const;
+
+    // 预留接口：设置行/字符背景（带透明度）
+    void setLineBackground(int line, const QColor &color, qreal alpha = 1.0);
+    void clearLineBackground(int line);
+    void clearAllLineBackgrounds();
+
+    void setCharBackground(int line, int column, const QColor &color, qreal alpha = 1.0);
+    void clearCharBackground(int line, int column);
+    void clearAllCharBackgrounds();
+
+    // 行号区域的绘制 & 点击
+    void lineNumberAreaPaintEvent(QPaintEvent *event);
+    void lineNumberAreaMousePressEvent(QMouseEvent *event);
+
+    void searchNext(const QString &text);
+
+    signals:
+        // 断点状态变化（暂时只发信号，不做具体逻辑）
+        void breakpointToggled(int line, bool enabled);
+
+protected:
+    void resizeEvent(QResizeEvent *event) override;
+    void keyPressEvent(QKeyEvent *event) override;
+
+private slots:
+    void updateLineNumberAreaWidth(int newBlockCount);
+    void updateLineNumberArea(const QRect &rect, int dy);
+    void highlightCurrentLine();
+
+    // ✅ 新增：来自联想窗口的补全插入
+    void insertCompletion(const QString &completion);
+
+private:
+    void refreshExtraSelections();
+    void handleReturnKey(QKeyEvent *event);
+    void toggleBreakpoint(int line);
+
+    // ✅ 新增：联想相关辅助函数
+    void initCompletion();
+    void showCompletion(const QString &prefix);
+    void hideCompletion();
+    QString wordUnderCursor() const;
+    void rebuildSearchMatches();
+    void applySearchHighlights();
+
+private:
+    LineNumberArea     *m_lineNumberArea = nullptr;
+    CSyntaxHighlighter *m_highlighter    = nullptr;
+
+    QSet<int> m_breakpoints;
+
+    QHash<int, LineBackgroundInfo>           m_lineBackgrounds;
+    QHash<int, QVector<CharBackgroundInfo>>  m_charBackgrounds;
+
+    // ✅ 新增：联想窗口和候选词列表
+    CompletionPopup *m_completionPopup = nullptr;
+    QStringList      m_completionWords;
+
+    QString              m_searchText;
+    QVector<QTextCursor> m_searchMatches;
+    int                  m_currentMatchIndex = -1;
+};
+
+
+
+// 对外仍然叫 CodeEditorWidget，内部包一个 CodeEditor
+class CodeEditorWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit CodeEditorWidget(QWidget *parent = nullptr);
+
+    void loadFromFile(const QString &filePath);
+    bool save();
+    bool saveAs(const QString &filePath);
+
+    QString currentText() const;
+    void clearEditor();
+
+    // 代理到内部 CodeEditor 的接口（以后你可以直接拿来做可视化用）
+    void setLineBackground(int line, const QColor &color, qreal alpha = 1.0);
+    void clearLineBackground(int line);
+
+    void setCharBackground(int line, int column, const QColor &color, qreal alpha = 1.0);
+    void clearCharBackground(int line, int column);
+
+private:
+    CodeEditor *m_editor = nullptr;
+    QString     m_currentFilePath;
+    FindReplaceBar *m_findBar = nullptr;
+};

ui/filebrowserwidget.cpp

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+#include "filebrowserwidget.h"
+
+#include <QTreeView>
+#include <QVBoxLayout>
+#include <QDir>
+
+FileBrowserWidget::FileBrowserWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    setupUi();
+    connectSignals();
+
+    // 默认浏览当前工作目录
+    setRootPath(QDir::currentPath());
+}
+
+void FileBrowserWidget::setupUi()
+{
+    m_model = new QFileSystemModel(this);
+    m_model->setRootPath(QString()); // 稍后在 setRootPath 里设置
+
+    m_view = new QTreeView(this);
+    m_view->setModel(m_model);
+    m_view->setHeaderHidden(true);
+    m_view->setAnimated(true);
+
+    auto *layout = new QVBoxLayout(this);
+    layout->setContentsMargins(0, 0, 0, 0);
+    layout->addWidget(m_view);
+    setLayout(layout);
+}
+
+void FileBrowserWidget::connectSignals()
+{
+    connect(m_view, &QTreeView::doubleClicked,
+            this, [this](const QModelIndex &index) {
+        if (!m_model)
+            return;
+        QString path = m_model->filePath(index);
+        if (QFileInfo(path).isFile())
+            emit fileOpenRequested(path);
+    });
+}
+
+void FileBrowserWidget::setRootPath(const QString &path)
+{
+    if (!m_model)
+        return;
+    QModelIndex idx = m_model->setRootPath(path);
+    m_view->setRootIndex(idx);
+}

ui/filebrowserwidget.h

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+#pragma once
+
+#include <QWidget>
+#include <QFileSystemModel>
+
+class QTreeView;
+
+class FileBrowserWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit FileBrowserWidget(QWidget *parent = nullptr);
+
+    void setRootPath(const QString &path);
+
+    signals:
+        // 当用户双击或选择某个文件时，通知 MainWindow/CodeEditor 打开
+        void fileOpenRequested(const QString &filePath);
+
+private:
+    QFileSystemModel *m_model = nullptr;
+    QTreeView        *m_view  = nullptr;
+
+    void setupUi();
+    void connectSignals();
+};