Erste Version

src/editor/CMakeLists.txt

@@ -0,0 +1,26 @@
+set(EDITOR_SOURCES
+    EditorPanel.cpp
+    EditorPanel.h
+    CodeEditor.cpp
+    CodeEditor.h
+    LineNumberArea.cpp
+    LineNumberArea.h
+    EditorTab.cpp
+    EditorTab.h
+    SearchPanel.cpp
+    SearchPanel.h
+)
+
+add_library(BareCode_Editor STATIC ${EDITOR_SOURCES})
+
+target_link_libraries(BareCode_Editor PUBLIC
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+    BareCode_Highlighter
+)
+
+target_include_directories(BareCode_Editor PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/..
+)

src/editor/CodeEditor.cpp

@@ -0,0 +1,345 @@
+#include "CodeEditor.h"
+#include "LineNumberArea.h"
+
+#include "core/Settings.h"
+#include "highlighter/HighlighterFactory.h"
+
+#include <QPainter>
+#include <QTextBlock>
+#include <QPaintEvent>
+#include <QResizeEvent>
+#include <QKeyEvent>
+#include <QScrollBar>
+#include <QFile>
+#include <QTextStream>
+#include <QFileInfo>
+#include <QFileDialog>
+#include <QMessageBox>
+
+CodeEditor::CodeEditor(Settings *settings, QWidget *parent)
+    : QPlainTextEdit(parent)
+    , m_settings(settings)
+{
+    m_lineNumberArea = new LineNumberArea(this);
+    setupEditor();
+
+    connect(this, &CodeEditor::blockCountChanged,
+            this, &CodeEditor::updateLineNumberAreaWidth);
+
+    connect(this, &CodeEditor::updateRequest,
+            this, &CodeEditor::updateLineNumberArea);
+
+    connect(this, &CodeEditor::cursorPositionChanged,
+            this, &CodeEditor::highlightCurrentLine);
+
+    updateLineNumberAreaWidth(0);
+    highlightCurrentLine();
+}
+
+CodeEditor::~CodeEditor() = default;
+
+// ---------------------------------------------------------------------------
+// Setup
+// ---------------------------------------------------------------------------
+void CodeEditor::setupEditor()
+{
+    applySettings();
+    setLineWrapMode(QPlainTextEdit::NoWrap);
+}
+
+void CodeEditor::applySettings()
+{
+    setFont(m_settings->editorFont());
+
+    const int tabStop = m_settings->tabSize();
+    // Set tab stop width in pixels using font metrics
+    QFontMetrics fm(m_settings->editorFont());
+    setTabStopDistance(static_cast<qreal>(tabStop) * fm.horizontalAdvance(' '));
+}
+
+// ---------------------------------------------------------------------------
+// File I/O
+// ---------------------------------------------------------------------------
+void CodeEditor::loadFile(const QString &filePath)
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
+    {
+        QMessageBox::warning(this, tr("Open File"),
+            tr("Cannot open file:\n%1").arg(filePath));
+        return;
+    }
+
+    m_filePath = filePath;
+
+    QTextStream in(&file);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    in.setEncoding(QStringConverter::Utf8);
+#else
+    in.setCodec("UTF-8");
+#endif
+
+    setPlainText(in.readAll());
+    document()->setModified(false);
+
+    installHighlighter(filePath);
+}
+
+QString CodeEditor::filePath() const
+{
+    return m_filePath;
+}
+
+bool CodeEditor::save()
+{
+    if (m_filePath.isEmpty())
+    {
+        return saveAs();
+    }
+
+    return writeToFile(m_filePath);
+}
+
+bool CodeEditor::saveAs()
+{
+    const QString path = QFileDialog::getSaveFileName(
+        this,
+        tr("Speichern unter"),
+        m_filePath
+    );
+
+    if (path.isEmpty())
+    {
+        return false;
+    }
+
+    m_filePath = path;
+    installHighlighter(m_filePath);
+    return writeToFile(m_filePath);
+}
+
+bool CodeEditor::writeToFile(const QString &filePath)
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
+    {
+        QMessageBox::warning(this, tr("Speichern"),
+            tr("Datei konnte nicht gespeichert werden:\n%1").arg(filePath));
+        return false;
+    }
+
+    QTextStream out(&file);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    out.setEncoding(QStringConverter::Utf8);
+#else
+    out.setCodec("UTF-8");
+#endif
+
+    out << toPlainText();
+    document()->setModified(false);
+    emit fileSaved(filePath);
+    return true;
+}
+
+void CodeEditor::installHighlighter(const QString &filePath)
+{
+    // Remove old highlighter first
+    delete m_highlighter;
+    m_highlighter = nullptr;
+
+    m_highlighter = HighlighterFactory::createForFile(filePath, document());
+}
+
+bool CodeEditor::isModified() const
+{
+    return document()->isModified();
+}
+
+// ---------------------------------------------------------------------------
+// Line number area
+// ---------------------------------------------------------------------------
+int CodeEditor::lineNumberAreaWidth() const
+{
+    int digits = 1;
+    int max    = qMax(1, blockCount());
+    while (max >= 10)
+    {
+        max /= 10;
+        ++digits;
+    }
+
+    const int padding = 8;
+    return fontMetrics().horizontalAdvance('9') * digits + padding * 2;
+}
+
+void CodeEditor::updateLineNumberAreaWidth(int /*newBlockCount*/)
+{
+    setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
+}
+
+void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
+{
+    if (dy != 0)
+    {
+        m_lineNumberArea->scroll(0, dy);
+    }
+    else
+    {
+        m_lineNumberArea->update(0, rect.y(), m_lineNumberArea->width(), rect.height());
+    }
+
+    if (rect.contains(viewport()->rect()))
+    {
+        updateLineNumberAreaWidth(0);
+    }
+}
+
+void CodeEditor::resizeEvent(QResizeEvent *event)
+{
+    QPlainTextEdit::resizeEvent(event);
+
+    const QRect cr = contentsRect();
+    m_lineNumberArea->setGeometry(
+        QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height())
+    );
+}
+
+void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
+{
+    QPainter painter(m_lineNumberArea);
+
+    // Background
+    const QColor bgColor = palette().color(QPalette::Window).darker(110);
+    painter.fillRect(event->rect(), bgColor);
+
+    const QColor lineNumColor = palette().color(QPalette::Mid);
+    const QColor activeColor  = palette().color(QPalette::Text);
+
+    const int currentLine = textCursor().blockNumber();
+
+    QTextBlock block    = firstVisibleBlock();
+    int blockNumber     = block.blockNumber();
+    int top    = static_cast<int>(blockBoundingGeometry(block).translated(contentOffset()).top());
+    int bottom = top + static_cast<int>(blockBoundingRect(block).height());
+
+    while (block.isValid() && top <= event->rect().bottom())
+    {
+        if (block.isVisible() && bottom >= event->rect().top())
+        {
+            const QString number = QString::number(blockNumber + 1);
+            painter.setPen(blockNumber == currentLine ? activeColor : lineNumColor);
+            painter.drawText(
+                0,
+                top,
+                m_lineNumberArea->width() - 4,
+                fontMetrics().height(),
+                Qt::AlignRight,
+                number
+            );
+        }
+
+        block   = block.next();
+        top     = bottom;
+        bottom  = top + static_cast<int>(blockBoundingRect(block).height());
+        ++blockNumber;
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Current line highlight
+// ---------------------------------------------------------------------------
+void CodeEditor::highlightCurrentLine()
+{
+    QList<QTextEdit::ExtraSelection> extraSelections;
+
+    if (!isReadOnly())
+    {
+        QTextEdit::ExtraSelection selection;
+
+        const QColor lineColor = palette().color(QPalette::AlternateBase);
+        selection.format.setBackground(lineColor);
+        selection.format.setProperty(QTextFormat::FullWidthSelection, true);
+        selection.cursor = textCursor();
+        selection.cursor.clearSelection();
+
+        extraSelections.append(selection);
+    }
+
+    setExtraSelections(extraSelections);
+}
+
+// ---------------------------------------------------------------------------
+// Key handling – auto-indent + Tab → spaces
+// ---------------------------------------------------------------------------
+void CodeEditor::keyPressEvent(QKeyEvent *event)
+{
+    // Tab key: insert spaces instead of a real tab character
+    if (event->key() == Qt::Key_Tab && m_settings->useSpacesForTabs())
+    {
+        const int tabSize = m_settings->tabSize();
+        QTextCursor cursor = textCursor();
+
+        if (cursor.hasSelection())
+        {
+            // Indent selected lines
+            QTextBlock startBlock = document()->findBlock(cursor.selectionStart());
+            QTextBlock endBlock   = document()->findBlock(cursor.selectionEnd());
+
+            cursor.beginEditBlock();
+            for (QTextBlock b = startBlock; b != endBlock.next(); b = b.next())
+            {
+                QTextCursor lineCursor(b);
+                lineCursor.insertText(QString(tabSize, ' '));
+            }
+            cursor.endEditBlock();
+        }
+        else
+        {
+            // Calculate spaces needed to reach next tab stop
+            const int col        = cursor.columnNumber();
+            const int spacesNeeded = tabSize - (col % tabSize);
+            cursor.insertText(QString(spacesNeeded, ' '));
+        }
+        return;
+    }
+
+    // Enter / Return: auto-indent
+    if (event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter)
+    {
+        QTextCursor cursor = textCursor();
+        const QString currentLine = cursor.block().text();
+
+        // Count leading whitespace
+        int leadingSpaces = 0;
+        for (const QChar &ch : currentLine)
+        {
+            if (ch == ' ')
+            {
+                ++leadingSpaces;
+            }
+            else if (ch == '\t')
+            {
+                leadingSpaces += m_settings->tabSize();
+            }
+            else
+            {
+                break;
+            }
+        }
+
+        // Let the base class insert the newline first
+        QPlainTextEdit::keyPressEvent(event);
+
+        // Then re-indent
+        if (leadingSpaces > 0)
+        {
+            const QString indent = m_settings->useSpacesForTabs()
+                ? QString(leadingSpaces, ' ')
+                : QString(leadingSpaces / m_settings->tabSize(), '\t');
+            textCursor().insertText(indent);
+        }
+        return;
+    }
+
+    QPlainTextEdit::keyPressEvent(event);
+}

src/editor/CodeEditor.h

@@ -0,0 +1,63 @@
+#pragma once
+
+#include <QPlainTextEdit>
+#include <QFont>
+#include <QString>
+
+class LineNumberArea;
+class Settings;
+class SyntaxHighlighter;
+
+// ---------------------------------------------------------------------------
+// CodeEditor – Core editing widget.
+// Features:
+//   • Line number gutter
+//   • Current-line highlight
+//   • Auto-indent on Enter
+//   • Tab → spaces (configurable)
+//   • Syntax highlighting (via pluggable SyntaxHighlighter)
+// ---------------------------------------------------------------------------
+class CodeEditor : public QPlainTextEdit
+{
+    Q_OBJECT
+
+public:
+    explicit CodeEditor(Settings *settings, QWidget *parent = nullptr);
+    ~CodeEditor() override;
+
+    void loadFile(const QString &filePath);
+    void applySettings();
+
+    // Speichern
+    bool save();
+    bool saveAs();
+
+    // Called by LineNumberArea
+    int  lineNumberAreaWidth() const;
+    void lineNumberAreaPaintEvent(QPaintEvent *event);
+
+    QString filePath()   const;
+    bool    isModified() const;
+
+signals:
+    void fileSaved(const QString &filePath);
+
+protected:
+    void resizeEvent(QResizeEvent *event) override;
+    void keyPressEvent(QKeyEvent *event) override;
+
+private slots:
+    void updateLineNumberAreaWidth(int newBlockCount);
+    void highlightCurrentLine();
+    void updateLineNumberArea(const QRect &rect, int dy);
+
+private:
+    void setupEditor();
+    void installHighlighter(const QString &filePath);
+    bool writeToFile(const QString &filePath);
+
+    Settings          *m_settings        = nullptr;
+    LineNumberArea    *m_lineNumberArea   = nullptr;
+    SyntaxHighlighter *m_highlighter      = nullptr;
+    QString            m_filePath;
+};

src/editor/EditorPanel.cpp

@@ -0,0 +1,157 @@
+#include "EditorPanel.h"
+#include "EditorTab.h"
+#include "CodeEditor.h"
+#include "SearchPanel.h"
+
+#include <QFileInfo>
+
+EditorPanel::EditorPanel(Settings *settings, QWidget *parent)
+    : QWidget(parent)
+    , m_settings(settings)
+{
+    setupUi();
+}
+
+// ---------------------------------------------------------------------------
+// Setup
+// ---------------------------------------------------------------------------
+void EditorPanel::setupUi()
+{
+    m_layout = new QVBoxLayout(this);
+    m_layout->setContentsMargins(0, 0, 0, 0);
+    m_layout->setSpacing(0);
+
+    m_tabWidget = new QTabWidget(this);
+    m_tabWidget->setTabsClosable(true);
+    m_tabWidget->setMovable(true);
+    m_tabWidget->setDocumentMode(true);
+
+    m_searchPanel = new SearchPanel(this);
+
+    m_layout->addWidget(m_tabWidget, 1);
+    m_layout->addWidget(m_searchPanel, 0);
+
+    connect(m_tabWidget, &QTabWidget::tabCloseRequested,
+            this, &EditorPanel::onTabCloseRequested);
+
+    connect(m_tabWidget, &QTabWidget::currentChanged,
+            this, &EditorPanel::onCurrentTabChanged);
+}
+
+// ---------------------------------------------------------------------------
+// Hilfsmethoden
+// ---------------------------------------------------------------------------
+EditorTab *EditorPanel::currentTab() const
+{
+    return qobject_cast<EditorTab *>(m_tabWidget->currentWidget());
+}
+
+int EditorPanel::findTabForFile(const QString &filePath) const
+{
+    EditorTab *tab = m_openTabs.value(filePath, nullptr);
+    return tab ? m_tabWidget->indexOf(tab) : -1;
+}
+
+// ---------------------------------------------------------------------------
+// Öffentliche Slots
+// ---------------------------------------------------------------------------
+void EditorPanel::openFile(const QString &filePath)
+{
+    const int existing = findTabForFile(filePath);
+    if (existing != -1)
+    {
+        m_tabWidget->setCurrentIndex(existing);
+        return;
+    }
+
+    EditorTab *tab = new EditorTab(filePath, m_settings, m_tabWidget);
+    const int index = m_tabWidget->addTab(tab, tab->fileName());
+    m_tabWidget->setCurrentIndex(index);
+    m_tabWidget->setTabToolTip(index, filePath);
+    m_openTabs.insert(filePath, tab);
+
+    // Tab-Titel nach "Speichern unter" aktualisieren
+    connect(tab->editor(), &CodeEditor::fileSaved, this, [this, tab](const QString &savedPath)
+    {
+        const int idx = m_tabWidget->indexOf(tab);
+        if (idx != -1)
+        {
+            m_tabWidget->setTabText(idx, QFileInfo(savedPath).fileName());
+            m_tabWidget->setTabToolTip(idx, savedPath);
+        }
+        emit currentFileSaved(savedPath);
+    });
+}
+
+void EditorPanel::saveCurrentFile()
+{
+    if (EditorTab *tab = currentTab())
+    {
+        tab->save();
+    }
+}
+
+void EditorPanel::saveCurrentFileAs()
+{
+    if (EditorTab *tab = currentTab())
+    {
+        tab->saveAs();
+    }
+}
+
+void EditorPanel::saveAllFiles()
+{
+    for (int i = 0; i < m_tabWidget->count(); ++i)
+    {
+        EditorTab *tab = qobject_cast<EditorTab *>(m_tabWidget->widget(i));
+        if (tab && tab->isModified())
+        {
+            tab->save();
+        }
+    }
+}
+
+void EditorPanel::showSearchPanel()
+{
+    m_searchPanel->activate();
+}
+
+void EditorPanel::undo()
+{
+    if (EditorTab *tab = currentTab())
+    {
+        tab->editor()->undo();
+    }
+}
+
+void EditorPanel::redo()
+{
+    if (EditorTab *tab = currentTab())
+    {
+        tab->editor()->redo();
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Private Slots
+// ---------------------------------------------------------------------------
+void EditorPanel::onTabCloseRequested(int index)
+{
+    EditorTab *tab = qobject_cast<EditorTab *>(m_tabWidget->widget(index));
+    if (!tab)
+    {
+        return;
+    }
+
+    m_openTabs.remove(tab->filePath());
+    m_tabWidget->removeTab(index);
+    tab->deleteLater();
+
+    m_searchPanel->setEditor(currentTab() ? currentTab()->editor() : nullptr);
+}
+
+void EditorPanel::onCurrentTabChanged(int /*index*/)
+{
+    EditorTab *tab = currentTab();
+    m_searchPanel->setEditor(tab ? tab->editor() : nullptr);
+}

src/editor/EditorPanel.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <QWidget>
+#include <QTabWidget>
+#include <QVBoxLayout>
+#include <QHash>
+#include <QString>
+
+class EditorTab;
+class Settings;
+class SearchPanel;
+
+// ---------------------------------------------------------------------------
+// EditorPanel – Rechtes Panel: Tab-Leiste + Editoren + Such/Ersetzen-Panel.
+// ---------------------------------------------------------------------------
+class EditorPanel : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit EditorPanel(Settings *settings, QWidget *parent = nullptr);
+
+public slots:
+    void openFile(const QString &filePath);
+    void saveCurrentFile();
+    void saveCurrentFileAs();
+    void saveAllFiles();
+    void showSearchPanel();
+    void undo();
+    void redo();
+
+signals:
+    void currentFileSaved(const QString &filePath);
+
+private slots:
+    void onTabCloseRequested(int index);
+    void onCurrentTabChanged(int index);
+
+private:
+    void       setupUi();
+    int        findTabForFile(const QString &filePath) const;
+    EditorTab *currentTab() const;
+
+    Settings    *m_settings    = nullptr;
+    QVBoxLayout *m_layout      = nullptr;
+    QTabWidget  *m_tabWidget   = nullptr;
+    SearchPanel *m_searchPanel = nullptr;
+
+    QHash<QString, EditorTab *> m_openTabs;
+};

src/editor/EditorTab.cpp

@@ -0,0 +1,53 @@
+#include "EditorTab.h"
+#include "CodeEditor.h"
+
+#include <QFileInfo>
+
+EditorTab::EditorTab(const QString &filePath, Settings *settings, QWidget *parent)
+    : QWidget(parent)
+    , m_filePath(filePath)
+{
+    m_layout = new QVBoxLayout(this);
+    m_layout->setContentsMargins(0, 0, 0, 0);
+    m_layout->setSpacing(0);
+
+    m_editor = new CodeEditor(settings, this);
+    m_editor->loadFile(filePath);
+
+    m_layout->addWidget(m_editor);
+}
+
+QString EditorTab::filePath() const
+{
+    return m_filePath;
+}
+
+QString EditorTab::fileName() const
+{
+    return QFileInfo(m_filePath).fileName();
+}
+
+CodeEditor *EditorTab::editor() const
+{
+    return m_editor;
+}
+
+bool EditorTab::isModified() const
+{
+    return m_editor->isModified();
+}
+
+bool EditorTab::save()
+{
+    const bool ok = m_editor->save();
+    // Path may have changed if this was an untitled buffer saved for the first time
+    m_filePath = m_editor->filePath();
+    return ok;
+}
+
+bool EditorTab::saveAs()
+{
+    const bool ok = m_editor->saveAs();
+    m_filePath = m_editor->filePath();
+    return ok;
+}

src/editor/EditorTab.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <QWidget>
+#include <QString>
+#include <QVBoxLayout>
+
+class CodeEditor;
+class Settings;
+
+// ---------------------------------------------------------------------------
+// EditorTab – Widget placed inside each tab of the tab bar.
+// Owns a CodeEditor for a single file.
+// ---------------------------------------------------------------------------
+class EditorTab : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit EditorTab(const QString &filePath, Settings *settings, QWidget *parent = nullptr);
+
+    QString     filePath() const;
+    QString     fileName() const;
+    CodeEditor *editor()   const;
+    bool        isModified() const;
+
+    bool        save();
+    bool        saveAs();
+
+private:
+    QString      m_filePath;
+    QVBoxLayout *m_layout = nullptr;
+    CodeEditor  *m_editor = nullptr;
+};

src/editor/LineNumberArea.cpp

@@ -0,0 +1,18 @@
+#include "LineNumberArea.h"
+#include "CodeEditor.h"
+
+LineNumberArea::LineNumberArea(CodeEditor *editor)
+    : QWidget(editor)
+    , m_codeEditor(editor)
+{
+}
+
+QSize LineNumberArea::sizeHint() const
+{
+    return QSize(m_codeEditor->lineNumberAreaWidth(), 0);
+}
+
+void LineNumberArea::paintEvent(QPaintEvent *event)
+{
+    m_codeEditor->lineNumberAreaPaintEvent(event);
+}

src/editor/LineNumberArea.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <QWidget>
+
+class CodeEditor;
+
+// ---------------------------------------------------------------------------
+// LineNumberArea – Thin widget painted on the left side of the CodeEditor.
+// Painted by CodeEditor::lineNumberAreaPaintEvent().
+// ---------------------------------------------------------------------------
+class LineNumberArea : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit LineNumberArea(CodeEditor *editor);
+
+    QSize sizeHint() const override;
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+
+private:
+    CodeEditor *m_codeEditor;
+};

src/editor/SearchPanel.cpp

@@ -0,0 +1,492 @@
+#include "SearchPanel.h"
+#include "CodeEditor.h"
+
+#include <QTextCursor>
+#include <QTextBlock>
+#include <QRegularExpression>
+#include <QMessageBox>
+#include <QKeyEvent>
+#include <QShortcut>
+
+SearchPanel::SearchPanel(QWidget *parent)
+    : QWidget(parent)
+{
+    setupUi();
+    hide();
+}
+
+// ---------------------------------------------------------------------------
+// UI
+// ---------------------------------------------------------------------------
+void SearchPanel::setupUi()
+{
+    m_grid = new QGridLayout(this);
+    m_grid->setContentsMargins(6, 4, 6, 4);
+    m_grid->setSpacing(4);
+
+    // ---- Row 0: Suchen ----
+    m_searchEdit = new QLineEdit(this);
+    m_searchEdit->setPlaceholderText(tr("Suchen…"));
+    m_searchEdit->setClearButtonEnabled(true);
+
+    m_btnPrev  = new QPushButton(tr("▲"), this);
+    m_btnNext  = new QPushButton(tr("▼"), this);
+    m_btnPrev->setFixedWidth(28);
+    m_btnNext->setFixedWidth(28);
+    m_btnPrev->setToolTip(tr("Vorheriger Treffer  (Shift+F3)"));
+    m_btnNext->setToolTip(tr("Nächster Treffer  (F3)"));
+
+    m_matchLabel = new QLabel(this);
+    m_matchLabel->setMinimumWidth(80);
+
+    m_btnClose = new QPushButton(tr("✕"), this);
+    m_btnClose->setFixedWidth(24);
+    m_btnClose->setToolTip(tr("Schließen  (Esc)"));
+    m_btnClose->setFlat(true);
+
+    QHBoxLayout *searchRow = new QHBoxLayout();
+    searchRow->addWidget(new QLabel(tr("Suchen:"), this));
+    searchRow->addWidget(m_searchEdit, 1);
+    searchRow->addWidget(m_btnPrev);
+    searchRow->addWidget(m_btnNext);
+    searchRow->addWidget(m_matchLabel);
+    searchRow->addWidget(m_btnClose);
+    m_grid->addLayout(searchRow, 0, 0);
+
+    // ---- Row 1: Ersetzen ----
+    m_replaceEdit = new QLineEdit(this);
+    m_replaceEdit->setPlaceholderText(tr("Ersetzen durch…"));
+    m_replaceEdit->setClearButtonEnabled(true);
+
+    m_btnReplace          = new QPushButton(tr("Ersetzen"), this);
+    m_btnReplaceAll       = new QPushButton(tr("Alle ersetzen"), this);
+    m_btnReplaceSelection = new QPushButton(tr("In Auswahl ersetzen"), this);
+
+    QHBoxLayout *replaceRow = new QHBoxLayout();
+    replaceRow->addWidget(new QLabel(tr("Ersetzen:"), this));
+    replaceRow->addWidget(m_replaceEdit, 1);
+    replaceRow->addWidget(m_btnReplace);
+    replaceRow->addWidget(m_btnReplaceAll);
+    replaceRow->addWidget(m_btnReplaceSelection);
+    m_grid->addLayout(replaceRow, 1, 0);
+
+    // ---- Row 2: Optionen ----
+    m_chkCase  = new QCheckBox(tr("Groß-/Kleinschreibung"), this);
+    m_chkWord  = new QCheckBox(tr("Ganzes Wort"), this);
+    m_chkRegex = new QCheckBox(tr("Regulärer Ausdruck"), this);
+
+    QHBoxLayout *optRow = new QHBoxLayout();
+    optRow->addWidget(m_chkCase);
+    optRow->addWidget(m_chkWord);
+    optRow->addWidget(m_chkRegex);
+    optRow->addStretch();
+    m_grid->addLayout(optRow, 2, 0);
+
+    // ---- Connections ----
+    connect(m_searchEdit, &QLineEdit::textChanged,
+            this, &SearchPanel::onSearchTextChanged);
+
+    connect(m_searchEdit, &QLineEdit::returnPressed,
+            this, &SearchPanel::findNext);
+
+    connect(m_btnNext,  &QPushButton::clicked, this, &SearchPanel::findNext);
+    connect(m_btnPrev,  &QPushButton::clicked, this, &SearchPanel::findPrevious);
+
+    connect(m_btnReplace,          &QPushButton::clicked, this, &SearchPanel::replaceCurrent);
+    connect(m_btnReplaceAll,       &QPushButton::clicked, this, &SearchPanel::replaceAll);
+    connect(m_btnReplaceSelection, &QPushButton::clicked, this, &SearchPanel::replaceInSelection);
+
+    connect(m_btnClose, &QPushButton::clicked, this, &SearchPanel::onCloseClicked);
+
+    connect(m_chkCase,  &QCheckBox::toggled, this, &SearchPanel::onOptionChanged);
+    connect(m_chkWord,  &QCheckBox::toggled, this, &SearchPanel::onOptionChanged);
+    connect(m_chkRegex, &QCheckBox::toggled, this, &SearchPanel::onOptionChanged);
+}
+
+// ---------------------------------------------------------------------------
+// Public interface
+// ---------------------------------------------------------------------------
+void SearchPanel::setEditor(CodeEditor *editor)
+{
+    clearHighlights();
+    m_editor = editor;
+}
+
+void SearchPanel::activate()
+{
+    show();
+    m_searchEdit->setFocus();
+    m_searchEdit->selectAll();
+
+    // Pre-fill with selected text if short enough
+    if (m_editor)
+    {
+        const QString sel = m_editor->textCursor().selectedText();
+        if (!sel.isEmpty() && !sel.contains('\n') && sel.length() < 200)
+        {
+            m_searchEdit->setText(sel);
+        }
+    }
+
+    updateMatchLabel();
+}
+
+// ---------------------------------------------------------------------------
+// Find helpers
+// ---------------------------------------------------------------------------
+QTextDocument::FindFlags SearchPanel::buildFindFlags(bool backwards) const
+{
+    QTextDocument::FindFlags flags;
+    if (backwards)              { flags |= QTextDocument::FindBackward;         }
+    if (m_chkCase->isChecked()) { flags |= QTextDocument::FindCaseSensitively;  }
+    if (m_chkWord->isChecked()) { flags |= QTextDocument::FindWholeWords;       }
+    return flags;
+}
+
+bool SearchPanel::performFind(bool backwards)
+{
+    if (!m_editor || m_searchEdit->text().isEmpty())
+    {
+        return false;
+    }
+
+    const QTextDocument::FindFlags flags = buildFindFlags(backwards);
+    bool found = false;
+
+    if (m_chkRegex->isChecked())
+    {
+        QRegularExpression re(m_searchEdit->text());
+        if (m_chkCase->isChecked())
+        {
+            re.setPatternOptions(QRegularExpression::NoPatternOption);
+        }
+        else
+        {
+            re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
+        }
+        found = m_editor->find(re, flags);
+
+        // Wrap around
+        if (!found)
+        {
+            QTextCursor c = m_editor->textCursor();
+            c.movePosition(backwards ? QTextCursor::End : QTextCursor::Start);
+            m_editor->setTextCursor(c);
+            found = m_editor->find(re, flags);
+        }
+    }
+    else
+    {
+        found = m_editor->find(m_searchEdit->text(), flags);
+
+        // Wrap around
+        if (!found)
+        {
+            QTextCursor c = m_editor->textCursor();
+            c.movePosition(backwards ? QTextCursor::End : QTextCursor::Start);
+            m_editor->setTextCursor(c);
+            found = m_editor->find(m_searchEdit->text(), flags);
+        }
+    }
+
+    return found;
+}
+
+void SearchPanel::highlightAllMatches()
+{
+    if (!m_editor)
+    {
+        return;
+    }
+
+    QList<QTextEdit::ExtraSelection> extras;
+
+    const QString needle = m_searchEdit->text();
+    if (needle.isEmpty())
+    {
+        m_editor->setExtraSelections(extras);
+        return;
+    }
+
+    QTextCharFormat fmt;
+    fmt.setBackground(QColor("#3a3a00"));
+    fmt.setForeground(QColor("#ffff80"));
+
+    QTextDocument *doc = m_editor->document();
+    QTextCursor   cursor(doc);
+
+    const QTextDocument::FindFlags flags = buildFindFlags(false);
+
+    while (true)
+    {
+        if (m_chkRegex->isChecked())
+        {
+            QRegularExpression re(needle);
+            if (!m_chkCase->isChecked())
+            {
+                re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
+            }
+            cursor = doc->find(re, cursor, flags);
+        }
+        else
+        {
+            cursor = doc->find(needle, cursor, flags);
+        }
+
+        if (cursor.isNull())
+        {
+            break;
+        }
+
+        QTextEdit::ExtraSelection sel;
+        sel.cursor = cursor;
+        sel.format = fmt;
+        extras.append(sel);
+    }
+
+    m_editor->setExtraSelections(extras);
+}
+
+void SearchPanel::clearHighlights()
+{
+    if (m_editor)
+    {
+        m_editor->setExtraSelections({});
+    }
+}
+
+void SearchPanel::updateMatchLabel()
+{
+    if (!m_editor || m_searchEdit->text().isEmpty())
+    {
+        m_matchLabel->setText(QString());
+        return;
+    }
+
+    // Count total matches
+    int count = 0;
+    QTextDocument *doc = m_editor->document();
+    QTextCursor   cursor(doc);
+    const QTextDocument::FindFlags flags = buildFindFlags(false);
+    const QString needle = m_searchEdit->text();
+
+    while (true)
+    {
+        if (m_chkRegex->isChecked())
+        {
+            QRegularExpression re(needle);
+            if (!m_chkCase->isChecked())
+            {
+                re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
+            }
+            cursor = doc->find(re, cursor, flags);
+        }
+        else
+        {
+            cursor = doc->find(needle, cursor, flags);
+        }
+
+        if (cursor.isNull())
+        {
+            break;
+        }
+        ++count;
+    }
+
+    if (count == 0)
+    {
+        m_matchLabel->setText(tr("Kein Treffer"));
+        m_matchLabel->setStyleSheet("color: #cc4444;");
+    }
+    else
+    {
+        m_matchLabel->setText(tr("%1 Treffer").arg(count));
+        m_matchLabel->setStyleSheet(QString());
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Public slots
+// ---------------------------------------------------------------------------
+void SearchPanel::findNext()
+{
+    performFind(false);
+}
+
+void SearchPanel::findPrevious()
+{
+    performFind(true);
+}
+
+void SearchPanel::replaceCurrent()
+{
+    if (!m_editor)
+    {
+        return;
+    }
+
+    QTextCursor cursor = m_editor->textCursor();
+
+    // If current selection matches the search term, replace it
+    // Otherwise just find the next occurrence first
+    const bool hasMatch = !cursor.selectedText().isEmpty();
+    if (!hasMatch)
+    {
+        performFind(false);
+        return;
+    }
+
+    cursor.insertText(m_replaceEdit->text());
+
+    // Move to next match
+    performFind(false);
+    updateMatchLabel();
+    highlightAllMatches();
+}
+
+void SearchPanel::replaceAll()
+{
+    if (!m_editor || m_searchEdit->text().isEmpty())
+    {
+        return;
+    }
+
+    QTextDocument *doc = m_editor->document();
+    QTextCursor   cursor(doc);
+    cursor.beginEditBlock();
+
+    int count = 0;
+    const QTextDocument::FindFlags flags = buildFindFlags(false);
+    const QString needle      = m_searchEdit->text();
+    const QString replacement = m_replaceEdit->text();
+
+    while (true)
+    {
+        if (m_chkRegex->isChecked())
+        {
+            QRegularExpression re(needle);
+            if (!m_chkCase->isChecked())
+            {
+                re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
+            }
+            cursor = doc->find(re, cursor, flags);
+        }
+        else
+        {
+            cursor = doc->find(needle, cursor, flags);
+        }
+
+        if (cursor.isNull())
+        {
+            break;
+        }
+
+        cursor.insertText(replacement);
+        ++count;
+    }
+
+    cursor.endEditBlock();
+
+    updateMatchLabel();
+    clearHighlights();
+
+    QMessageBox::information(this, tr("Alle ersetzen"),
+        tr("%1 Ersetzung(en) durchgeführt.").arg(count));
+}
+
+void SearchPanel::replaceInSelection()
+{
+    if (!m_editor || m_searchEdit->text().isEmpty())
+    {
+        return;
+    }
+
+    QTextCursor selCursor = m_editor->textCursor();
+    if (!selCursor.hasSelection())
+    {
+        QMessageBox::information(this, tr("In Auswahl ersetzen"),
+            tr("Es ist kein Text ausgewählt."));
+        return;
+    }
+
+    // Work only within the selected region
+    const int selStart = selCursor.selectionStart();
+    const int selEnd   = selCursor.selectionEnd();
+
+    QTextDocument *doc = m_editor->document();
+    QTextCursor   cursor(doc);
+    cursor.setPosition(selStart);
+    cursor.beginEditBlock();
+
+    int count = 0;
+    int offset = 0; // Replacement may be longer/shorter than search term
+    const QTextDocument::FindFlags flags = buildFindFlags(false);
+    const QString needle      = m_searchEdit->text();
+    const QString replacement = m_replaceEdit->text();
+
+    while (true)
+    {
+        if (m_chkRegex->isChecked())
+        {
+            QRegularExpression re(needle);
+            if (!m_chkCase->isChecked())
+            {
+                re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
+            }
+            cursor = doc->find(re, cursor, flags);
+        }
+        else
+        {
+            cursor = doc->find(needle, cursor, flags);
+        }
+
+        if (cursor.isNull())
+        {
+            break;
+        }
+
+        // Stop if we've left the original selection
+        if (cursor.selectionEnd() > selEnd + offset)
+        {
+            break;
+        }
+
+        offset += replacement.length() - cursor.selectedText().length();
+        cursor.insertText(replacement);
+        ++count;
+    }
+
+    cursor.endEditBlock();
+
+    updateMatchLabel();
+    clearHighlights();
+
+    QMessageBox::information(this, tr("In Auswahl ersetzen"),
+        tr("%1 Ersetzung(en) in der Auswahl durchgeführt.").arg(count));
+}
+
+// ---------------------------------------------------------------------------
+// Private slots
+// ---------------------------------------------------------------------------
+void SearchPanel::onSearchTextChanged(const QString &/*text*/)
+{
+    highlightAllMatches();
+    updateMatchLabel();
+}
+
+void SearchPanel::onOptionChanged()
+{
+    highlightAllMatches();
+    updateMatchLabel();
+}
+
+void SearchPanel::onCloseClicked()
+{
+    clearHighlights();
+    m_matchLabel->setText(QString());
+    hide();
+    if (m_editor)
+    {
+        m_editor->setFocus();
+    }
+}

src/editor/SearchPanel.h

@@ -0,0 +1,79 @@
+#pragma once
+
+#include <QWidget>
+#include <QLineEdit>
+#include <QPushButton>
+#include <QCheckBox>
+#include <QLabel>
+#include <QGridLayout>
+#include <QHBoxLayout>
+#include <QTextDocument>
+
+class CodeEditor;
+
+// ---------------------------------------------------------------------------
+// SearchPanel – Collapsible find/replace bar that operates on a CodeEditor.
+//
+// Capabilities:
+//   • Nächsten / Vorherigen Treffer suchen
+//   • Einzeln ersetzen
+//   • Alle ersetzen
+//   • Nur in Auswahl ersetzen
+//   • Optionen: Groß-/Kleinschreibung, Ganzes Wort, Reguläre Ausdrücke
+// ---------------------------------------------------------------------------
+class SearchPanel : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit SearchPanel(QWidget *parent = nullptr);
+
+    // Must be called whenever the active editor changes
+    void setEditor(CodeEditor *editor);
+
+    // Toggle visibility and focus the search field
+    void activate();
+
+public slots:
+    void findNext();
+    void findPrevious();
+    void replaceCurrent();
+    void replaceAll();
+    void replaceInSelection();
+
+private slots:
+    void onSearchTextChanged(const QString &text);
+    void onOptionChanged();   // Für Checkbox-Signale (bool-Parameter wird ignoriert)
+    void onCloseClicked();
+
+private:
+    void setupUi();
+
+    QTextDocument::FindFlags buildFindFlags(bool backwards = false) const;
+    bool                     performFind(bool backwards = false);
+    void                     highlightAllMatches();
+    void                     clearHighlights();
+    void                     updateMatchLabel();
+
+    CodeEditor  *m_editor = nullptr;
+
+    // Search row
+    QLineEdit   *m_searchEdit     = nullptr;
+    QPushButton *m_btnPrev        = nullptr;
+    QPushButton *m_btnNext        = nullptr;
+    QLabel      *m_matchLabel     = nullptr;
+    QPushButton *m_btnClose       = nullptr;
+
+    // Replace row
+    QLineEdit   *m_replaceEdit          = nullptr;
+    QPushButton *m_btnReplace           = nullptr;
+    QPushButton *m_btnReplaceAll        = nullptr;
+    QPushButton *m_btnReplaceSelection  = nullptr;
+
+    // Options row
+    QCheckBox   *m_chkCase      = nullptr;
+    QCheckBox   *m_chkWord      = nullptr;
+    QCheckBox   *m_chkRegex     = nullptr;
+
+    QGridLayout *m_grid = nullptr;
+};