Feat: Sidebar mit Suchfilter und lxml-Parser im XslDependencyDialog

- Ein-/ausblendbare Sidebar mit tab-übergreifender Suche hinzugefügt
- Graph-Suchfilter blendet nicht-betroffene XSL-Dateien aus dem Netzwerkgraph aus
- Regex-basierte XSL-Abhängigkeitserkennung durch lxml-Parser ersetzt
- Suchfilter wird beim Tab-Wechsel erneut angewendet

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ui/XslDependencyDialog.py

@@ -47,9 +47,17 @@ class XslDependencyDialog(QDialog):
         self._graph_loaded = False
         self._temp_html_file: tempfile.NamedTemporaryFile | None = None
 
+        self._sidebar_visible = False
+
         self.ui = Ui_XslDependencyDialog()
         self.ui.setupUi(self)
 
+        # Sidebar initial ausblenden
+        self.ui.settingsButton.setIcon(QIcon.fromTheme("preferences-system"))
+        self.ui.sidebarWidget.setVisible(False)
+        self.ui.mainSplitter.setSizes([1000, 0])
+        self.ui.settingsButton.clicked.connect(self._toggle_sidebar)
+
         # Netzwerkgraph-Tab ausblenden wenn WebEngine nicht verfügbar
         if not HAS_WEBENGINE:
             self.ui.tabWidget.removeTab(1)
@@ -72,6 +80,9 @@ class XslDependencyDialog(QDialog):
         self.ui.fileTree.currentItemChanged.connect(self._on_file_selected)
         self.ui.searchEdit.textChanged.connect(self._on_search_changed)
         self.ui.tabWidget.currentChanged.connect(self._on_tab_changed)
+        self.ui.graphFilterConnectedCheck.toggled.connect(
+            lambda: self._on_search_changed(self.ui.searchEdit.text())
+        )
 
     def closeEvent(self, event):
         """Räumt temporäre Dateien und QWebEngineView auf."""
@@ -197,17 +208,46 @@ class XslDependencyDialog(QDialog):
             self.ui.depTree.addTopLevelItem(no_deps_item)
 
     def _on_search_changed(self, text: str):
+        """Filtert je nach aktivem Tab die Dateiliste oder den Netzwerkgraph."""
+        current_tab = self.ui.tabWidget.currentIndex()
+        if current_tab == 0:
+            self._search_tree(text)
+        elif current_tab == 1 and self._web_view is not None:
+            self._search_graph(text)
+
+    def _search_tree(self, text: str):
         """Filtert die Dateiliste nach dem Suchbegriff."""
         search_lower = text.lower()
         for i in range(self.ui.fileTree.topLevelItemCount()):
             item = self.ui.fileTree.topLevelItem(i)
-            matches = search_lower in item.text(0).lower()
+            matches = not search_lower or search_lower in item.text(0).lower()
             item.setHidden(not matches)
 
+    def _search_graph(self, text: str):
+        """Filtert oder dimmt Knoten im Netzwerkgraph je nach Checkbox-Einstellung."""
+        escaped = text.replace("\\", "\\\\").replace("'", "\\'")
+        hide_unrelated = str(self.ui.graphFilterConnectedCheck.isChecked()).lower()
+        self._web_view.page().runJavaScript(f"filterNodes('{escaped}', {hide_unrelated})")
+
+    # === Sidebar ===
+
+    def _toggle_sidebar(self):
+        """Blendet die Einstellungs-Sidebar ein oder aus."""
+        self._sidebar_visible = not self._sidebar_visible
+        if self._sidebar_visible:
+            self.ui.sidebarWidget.setVisible(True)
+            self.ui.mainSplitter.setSizes([750, 250])
+        else:
+            self.ui.mainSplitter.setSizes([1000, 0])
+            self.ui.sidebarWidget.setVisible(False)
+
     # === Netzwerkgraph (vis.js) ===
 
     def _on_tab_changed(self, index: int):
-        """Lazy-Init des Netzwerkgraphs beim ersten Tab-Wechsel."""
+        """Lazy-Init des Netzwerkgraphs beim ersten Tab-Wechsel und Sidebar-Seite synchronisieren."""
+        # Sidebar-Seite synchronisieren
+        self.ui.settingsStack.setCurrentIndex(index)
+
         if not HAS_WEBENGINE:
             return
 
@@ -215,6 +255,11 @@ class XslDependencyDialog(QDialog):
         if index == 1 and not self._graph_loaded:
             self._setup_network_graph()
 
+        # Suchbegriff auf den neuen Tab anwenden
+        search_text = self.ui.searchEdit.text()
+        if search_text:
+            self._on_search_changed(search_text)
+
     def _setup_network_graph(self):
         """Erstellt QWebEngineView und lädt den vis.js Netzwerkgraph."""
         self._web_view = QWebEngineView(self.ui.graphContainer)
@@ -474,6 +519,117 @@ class XslDependencyDialog(QDialog):
         }});
         edges.update(edgeUpdates);
     }});
+
+    // Suchfunktion: Knoten nach Label filtern
+    function filterNodes(searchTerm, hideUnrelated) {{
+        var term = searchTerm.toLowerCase();
+
+        if (hideUnrelated) {{
+            // Originalzustand wiederherstellen
+            nodes.clear();
+            edges.clear();
+            nodes.add(nodesData);
+            edges.add(edgesData);
+            allNodes = nodes.get();
+
+            if (!term) return;
+
+            // 1. Matching-Knoten finden
+            var matchedIds = new Set();
+            nodesData.forEach(function(node) {{
+                if (node.label.toLowerCase().indexOf(term) !== -1) {{
+                    matchedIds.add(node.id);
+                }}
+            }});
+
+            // 2. Gerichtete Adjazenzlisten aufbauen
+            var fwd = {{}};  // from → to (Import-Richtung)
+            var bwd = {{}};  // to → from (Reverse)
+            edgesData.forEach(function(edge) {{
+                if (!fwd[edge.from]) fwd[edge.from] = [];
+                if (!bwd[edge.to]) bwd[edge.to] = [];
+                fwd[edge.from].push(edge.to);
+                bwd[edge.to].push(edge.from);
+            }});
+
+            // 3. BFS vorwärts (Nachkommen) + rückwärts (Vorfahren)
+            var reachable = new Set(matchedIds);
+            var queue = Array.from(matchedIds);
+            while (queue.length > 0) {{
+                var current = queue.shift();
+                (fwd[current] || []).forEach(function(n) {{
+                    if (!reachable.has(n)) {{ reachable.add(n); queue.push(n); }}
+                }});
+            }}
+            queue = Array.from(matchedIds);
+            while (queue.length > 0) {{
+                var current = queue.shift();
+                (bwd[current] || []).forEach(function(n) {{
+                    if (!reachable.has(n)) {{ reachable.add(n); queue.push(n); }}
+                }});
+            }}
+
+            // 4. Nicht-erreichbare Knoten und Kanten entfernen
+            var removeNodeIds = [];
+            nodesData.forEach(function(node) {{
+                if (!reachable.has(node.id)) removeNodeIds.push(node.id);
+            }});
+            nodes.remove(removeNodeIds);
+
+            var removeEdgeIds = [];
+            edgesData.forEach(function(edge) {{
+                if (!reachable.has(edge.from) || !reachable.has(edge.to))
+                    removeEdgeIds.push(edge.id);
+            }});
+            edges.remove(removeEdgeIds);
+
+            // Matching-Knoten hervorheben, verbundene leicht dimmen
+            var updates = [];
+            matchedIds.forEach(function(id) {{
+                updates.push({{ id: id, opacity: 1.0 }});
+            }});
+            reachable.forEach(function(id) {{
+                if (!matchedIds.has(id)) {{
+                    updates.push({{ id: id, opacity: 0.5 }});
+                }}
+            }});
+            nodes.update(updates);
+            allNodes = nodes.get();
+
+        }} else {{
+            // Originalzustand wiederherstellen falls vorher gefiltert
+            nodes.clear();
+            edges.clear();
+            nodes.add(nodesData);
+            edges.add(edgesData);
+            allNodes = nodes.get();
+
+            // Bisheriges Verhalten: nur dimmen
+            var updates = [];
+            var matchedIds = new Set();
+
+            allNodes.forEach(function(node) {{
+                if (!term || node.label.toLowerCase().indexOf(term) !== -1) {{
+                    updates.push({{ id: node.id, opacity: 1.0 }});
+                    matchedIds.add(node.id);
+                }} else {{
+                    updates.push({{ id: node.id, opacity: 0.12 }});
+                }}
+            }});
+            nodes.update(updates);
+
+            var allEdges = edges.get();
+            var edgeUpdates = [];
+            allEdges.forEach(function(edge) {{
+                if (!term || (matchedIds.has(edge.from) && matchedIds.has(edge.to))) {{
+                    edgeUpdates.push({{ id: edge.id, color: {{ opacity: 0.7 }} }});
+                }} else {{
+                    edgeUpdates.push({{ id: edge.id, color: {{ opacity: 0.05 }} }});
+                }}
+            }});
+            edges.update(edgeUpdates);
+        }}
+    }}
 </script>
 </body>
 </html>"""

src/ui/XslDependencyDialog.ui

@@ -15,157 +15,281 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <widget class="QTabWidget" name="tabWidget">
-     <property name="currentIndex">
-      <number>0</number>
+    <layout class="QHBoxLayout" name="toolbarLayout">
+     <item>
+      <spacer name="toolbarSpacer">
+       <property name="orientation">
+        <enum>Qt::Orientation::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="settingsButton">
+       <property name="maximumSize">
+        <size>
+         <width>28</width>
+         <height>28</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Einstellungen ein-/ausblenden</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="flat">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QSplitter" name="mainSplitter">
+     <property name="orientation">
+      <enum>Qt::Orientation::Horizontal</enum>
      </property>
-     <widget class="QWidget" name="treeTab">
-      <attribute name="title">
-       <string>Baumansicht</string>
-      </attribute>
-      <layout class="QVBoxLayout" name="treeTabLayout">
-       <item>
-        <layout class="QHBoxLayout" name="searchLayout">
-         <item>
-          <widget class="QLabel" name="searchLabel">
-           <property name="text">
-            <string>Suche:</string>
-           </property>
+     <property name="childrenCollapsible">
+      <bool>true</bool>
+     </property>
+     <widget class="QTabWidget" name="tabWidget">
+      <property name="currentIndex">
+       <number>0</number>
+      </property>
+      <widget class="QWidget" name="treeTab">
+       <attribute name="title">
+        <string>Baumansicht</string>
+       </attribute>
+       <layout class="QVBoxLayout" name="treeTabLayout">
+        <item>
+         <widget class="QSplitter" name="splitter">
+          <property name="orientation">
+           <enum>Qt::Orientation::Horizontal</enum>
+          </property>
+          <widget class="QWidget" name="leftWidget" native="true">
+           <layout class="QVBoxLayout" name="leftLayout">
+            <property name="leftMargin">
+             <number>0</number>
+            </property>
+            <property name="topMargin">
+             <number>0</number>
+            </property>
+            <property name="rightMargin">
+             <number>0</number>
+            </property>
+            <property name="bottomMargin">
+             <number>0</number>
+            </property>
+            <item>
+             <widget class="QLabel" name="leftLabel">
+              <property name="text">
+               <string>XSL-Dateien</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QTreeWidget" name="fileTree">
+              <property name="alternatingRowColors">
+               <bool>true</bool>
+              </property>
+              <property name="selectionMode">
+               <enum>QAbstractItemView::SelectionMode::SingleSelection</enum>
+              </property>
+              <property name="rootIsDecorated">
+               <bool>true</bool>
+              </property>
+              <column>
+               <property name="text">
+                <string notr="true">1</string>
+               </property>
+              </column>
+             </widget>
+            </item>
+           </layout>
           </widget>
-         </item>
-         <item>
-          <widget class="QLineEdit" name="searchEdit">
-           <property name="placeholderText">
-            <string>XSL-Datei filtern...</string>
-           </property>
-           <property name="clearButtonEnabled">
-            <bool>true</bool>
-           </property>
+          <widget class="QWidget" name="rightWidget" native="true">
+           <layout class="QVBoxLayout" name="rightLayout">
+            <property name="leftMargin">
+             <number>0</number>
+            </property>
+            <property name="topMargin">
+             <number>0</number>
+            </property>
+            <property name="rightMargin">
+             <number>0</number>
+            </property>
+            <property name="bottomMargin">
+             <number>0</number>
+            </property>
+            <item>
+             <widget class="QLabel" name="rightLabel">
+              <property name="text">
+               <string>Abhängigkeiten</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QTreeWidget" name="depTree">
+              <property name="alternatingRowColors">
+               <bool>true</bool>
+              </property>
+              <property name="rootIsDecorated">
+               <bool>true</bool>
+              </property>
+              <column>
+               <property name="text">
+                <string notr="true">1</string>
+               </property>
+              </column>
+             </widget>
+            </item>
+           </layout>
           </widget>
-         </item>
-        </layout>
-       </item>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+      <widget class="QWidget" name="graphTab">
+       <attribute name="title">
+        <string>Netzwerkgraph</string>
+       </attribute>
+       <layout class="QVBoxLayout" name="graphTabLayout">
+        <property name="leftMargin">
+         <number>0</number>
+        </property>
+        <property name="topMargin">
+         <number>0</number>
+        </property>
+        <property name="rightMargin">
+         <number>0</number>
+        </property>
+        <property name="bottomMargin">
+         <number>0</number>
+        </property>
+        <item>
+         <widget class="QWidget" name="graphContainer" native="true">
+          <layout class="QVBoxLayout" name="graphContainerLayout">
+           <property name="leftMargin">
+            <number>0</number>
+           </property>
+           <property name="topMargin">
+            <number>0</number>
+           </property>
+           <property name="rightMargin">
+            <number>0</number>
+           </property>
+           <property name="bottomMargin">
+            <number>0</number>
+           </property>
+          </layout>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+     </widget>
+     <widget class="QWidget" name="sidebarWidget" native="true">
+      <layout class="QVBoxLayout" name="sidebarLayout">
        <item>
-        <widget class="QSplitter" name="splitter">
-         <property name="orientation">
-          <enum>Qt::Horizontal</enum>
+        <widget class="QLabel" name="sidebarLabel">
+         <property name="font">
+          <font>
+           <bold>true</bold>
+          </font>
+         </property>
+         <property name="text">
+          <string>Einstellungen</string>
          </property>
-         <widget class="QWidget" name="leftWidget" native="true">
-          <layout class="QVBoxLayout" name="leftLayout">
-           <property name="leftMargin">
-            <number>0</number>
-           </property>
-           <property name="topMargin">
-            <number>0</number>
-           </property>
-           <property name="rightMargin">
-            <number>0</number>
-           </property>
-           <property name="bottomMargin">
-            <number>0</number>
-           </property>
-           <item>
-            <widget class="QLabel" name="leftLabel">
-             <property name="text">
-              <string>XSL-Dateien</string>
-             </property>
-            </widget>
-           </item>
-           <item>
-            <widget class="QTreeWidget" name="fileTree">
-             <property name="alternatingRowColors">
-              <bool>true</bool>
-             </property>
-             <property name="selectionMode">
-              <enum>QAbstractItemView::SingleSelection</enum>
-             </property>
-             <property name="rootIsDecorated">
-              <bool>true</bool>
-             </property>
-             <column>
-              <property name="text">
-               <string notr="true">1</string>
-              </property>
-             </column>
-            </widget>
-           </item>
-          </layout>
-         </widget>
-         <widget class="QWidget" name="rightWidget" native="true">
-          <layout class="QVBoxLayout" name="rightLayout">
-           <property name="leftMargin">
-            <number>0</number>
-           </property>
-           <property name="topMargin">
-            <number>0</number>
-           </property>
-           <property name="rightMargin">
-            <number>0</number>
-           </property>
-           <property name="bottomMargin">
-            <number>0</number>
-           </property>
-           <item>
-            <widget class="QLabel" name="rightLabel">
-             <property name="text">
-              <string>Abhängigkeiten</string>
-             </property>
-            </widget>
-           </item>
-           <item>
-            <widget class="QTreeWidget" name="depTree">
-             <property name="alternatingRowColors">
-              <bool>true</bool>
-             </property>
-             <property name="rootIsDecorated">
-              <bool>true</bool>
-             </property>
-             <column>
-              <property name="text">
-               <string notr="true">1</string>
-              </property>
-             </column>
-            </widget>
-           </item>
-          </layout>
-         </widget>
         </widget>
        </item>
-      </layout>
-     </widget>
-     <widget class="QWidget" name="graphTab">
-      <attribute name="title">
-       <string>Netzwerkgraph</string>
-      </attribute>
-      <layout class="QVBoxLayout" name="graphTabLayout">
-       <property name="leftMargin">
-        <number>0</number>
-       </property>
-       <property name="topMargin">
-        <number>0</number>
-       </property>
-       <property name="rightMargin">
-        <number>0</number>
-       </property>
-       <property name="bottomMargin">
-        <number>0</number>
-       </property>
        <item>
-        <widget class="QWidget" name="graphContainer" native="true">
-         <layout class="QVBoxLayout" name="graphContainerLayout">
-          <property name="leftMargin">
-           <number>0</number>
-          </property>
-          <property name="topMargin">
-           <number>0</number>
-          </property>
-          <property name="rightMargin">
-           <number>0</number>
-          </property>
-          <property name="bottomMargin">
-           <number>0</number>
-          </property>
-         </layout>
+        <widget class="QLabel" name="searchLabel">
+         <property name="text">
+          <string>Suche:</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLineEdit" name="searchEdit">
+         <property name="placeholderText">
+          <string>XSL-Datei filtern...</string>
+         </property>
+         <property name="clearButtonEnabled">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QStackedWidget" name="settingsStack">
+         <property name="currentIndex">
+          <number>0</number>
+         </property>
+         <widget class="QWidget" name="treeSettingsPage">
+          <layout class="QVBoxLayout" name="treeSettingsLayout">
+           <item>
+            <widget class="QLabel" name="treeSettingsLabel">
+             <property name="text">
+              <string>Baumansicht-Einstellungen</string>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <spacer name="treeSettingsSpacer">
+             <property name="orientation">
+              <enum>Qt::Orientation::Vertical</enum>
+             </property>
+             <property name="sizeHint" stdset="0">
+              <size>
+               <width>20</width>
+               <height>40</height>
+              </size>
+             </property>
+            </spacer>
+           </item>
+          </layout>
+         </widget>
+         <widget class="QWidget" name="graphSettingsPage">
+          <layout class="QVBoxLayout" name="graphSettingsLayout">
+           <item>
+            <widget class="QLabel" name="graphSettingsLabel">
+             <property name="text">
+              <string>Graph-Einstellungen</string>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QCheckBox" name="graphFilterConnectedCheck">
+             <property name="text">
+              <string>Nur betroffene Dateien anzeigen</string>
+             </property>
+             <property name="toolTip">
+              <string>Entfernt alle XSL-Dateien aus dem Graph, die nicht zum Suchbegriff passen und nicht direkt oder indirekt mit passenden Dateien verbunden sind</string>
+             </property>
+             <property name="checked">
+              <bool>true</bool>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <spacer name="graphSettingsSpacer">
+             <property name="orientation">
+              <enum>Qt::Orientation::Vertical</enum>
+             </property>
+             <property name="sizeHint" stdset="0">
+              <size>
+               <width>20</width>
+               <height>40</height>
+              </size>
+             </property>
+            </spacer>
+           </item>
+          </layout>
+         </widget>
         </widget>
        </item>
       </layout>
@@ -174,6 +298,12 @@
    </item>
    <item>
     <widget class="QLabel" name="statusLabel">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Maximum">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
      <property name="text">
       <string/>
      </property>
@@ -182,10 +312,10 @@
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
-      <enum>Qt::Horizontal</enum>
+      <enum>Qt::Orientation::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Close</set>
+      <set>QDialogButtonBox::StandardButton::Close</set>
      </property>
      <property name="centerButtons">
       <bool>true</bool>
@@ -194,6 +324,7 @@
    </item>
   </layout>
  </widget>
+ <resources/>
  <connections>
   <connection>
    <sender>buttonBox</sender>

src/ui/XslDependencyDialog_ui.py

@@ -15,10 +15,12 @@ from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
     QFont, QFontDatabase, QGradient, QIcon,
     QImage, QKeySequence, QLinearGradient, QPainter,
     QPalette, QPixmap, QRadialGradient, QTransform)
-from PySide6.QtWidgets import (QAbstractButton, QAbstractItemView, QApplication, QDialog,
-    QDialogButtonBox, QHBoxLayout, QHeaderView, QLabel,
-    QLineEdit, QSizePolicy, QSplitter, QTabWidget,
+from PySide6.QtWidgets import (QAbstractButton, QAbstractItemView, QApplication, QCheckBox,
+    QDialog, QDialogButtonBox, QHBoxLayout, QHeaderView,
+    QLabel, QLineEdit, QPushButton, QSizePolicy,
+    QSpacerItem, QSplitter, QStackedWidget, QTabWidget,
     QTreeWidget, QTreeWidgetItem, QVBoxLayout, QWidget)
+
 class Ui_XslDependencyDialog(object):
     def setupUi(self, XslDependencyDialog):
         if not XslDependencyDialog.objectName():
@@ -26,31 +28,35 @@ class Ui_XslDependencyDialog(object):
         XslDependencyDialog.resize(1000, 700)
         self.verticalLayout = QVBoxLayout(XslDependencyDialog)
         self.verticalLayout.setObjectName(u"verticalLayout")
-        self.tabWidget = QTabWidget(XslDependencyDialog)
+        self.toolbarLayout = QHBoxLayout()
+        self.toolbarLayout.setObjectName(u"toolbarLayout")
+        self.toolbarSpacer = QSpacerItem(40, 20, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Minimum)
+
+        self.toolbarLayout.addItem(self.toolbarSpacer)
+
+        self.settingsButton = QPushButton(XslDependencyDialog)
+        self.settingsButton.setObjectName(u"settingsButton")
+        self.settingsButton.setMaximumSize(QSize(28, 28))
+        self.settingsButton.setFlat(True)
+
+        self.toolbarLayout.addWidget(self.settingsButton)
+
+
+        self.verticalLayout.addLayout(self.toolbarLayout)
+
+        self.mainSplitter = QSplitter(XslDependencyDialog)
+        self.mainSplitter.setObjectName(u"mainSplitter")
+        self.mainSplitter.setOrientation(Qt.Orientation.Horizontal)
+        self.mainSplitter.setChildrenCollapsible(True)
+        self.tabWidget = QTabWidget(self.mainSplitter)
         self.tabWidget.setObjectName(u"tabWidget")
         self.treeTab = QWidget()
         self.treeTab.setObjectName(u"treeTab")
         self.treeTabLayout = QVBoxLayout(self.treeTab)
         self.treeTabLayout.setObjectName(u"treeTabLayout")
-        self.searchLayout = QHBoxLayout()
-        self.searchLayout.setObjectName(u"searchLayout")
-        self.searchLabel = QLabel(self.treeTab)
-        self.searchLabel.setObjectName(u"searchLabel")
-
-        self.searchLayout.addWidget(self.searchLabel)
-
-        self.searchEdit = QLineEdit(self.treeTab)
-        self.searchEdit.setObjectName(u"searchEdit")
-        self.searchEdit.setClearButtonEnabled(True)
-
-        self.searchLayout.addWidget(self.searchEdit)
-
-
-        self.treeTabLayout.addLayout(self.searchLayout)
-
         self.splitter = QSplitter(self.treeTab)
         self.splitter.setObjectName(u"splitter")
-        self.splitter.setOrientation(Qt.Horizontal)
+        self.splitter.setOrientation(Qt.Orientation.Horizontal)
         self.leftWidget = QWidget(self.splitter)
         self.leftWidget.setObjectName(u"leftWidget")
         self.leftLayout = QVBoxLayout(self.leftWidget)
@@ -67,7 +73,7 @@ class Ui_XslDependencyDialog(object):
         self.fileTree.setHeaderItem(__qtreewidgetitem)
         self.fileTree.setObjectName(u"fileTree")
         self.fileTree.setAlternatingRowColors(True)
-        self.fileTree.setSelectionMode(QAbstractItemView.SingleSelection)
+        self.fileTree.setSelectionMode(QAbstractItemView.SelectionMode.SingleSelection)
         self.fileTree.setRootIsDecorated(True)
 
         self.leftLayout.addWidget(self.fileTree)
@@ -112,18 +118,87 @@ class Ui_XslDependencyDialog(object):
         self.graphTabLayout.addWidget(self.graphContainer)
 
         self.tabWidget.addTab(self.graphTab, "")
+        self.mainSplitter.addWidget(self.tabWidget)
+        self.sidebarWidget = QWidget(self.mainSplitter)
+        self.sidebarWidget.setObjectName(u"sidebarWidget")
+        self.sidebarLayout = QVBoxLayout(self.sidebarWidget)
+        self.sidebarLayout.setObjectName(u"sidebarLayout")
+        self.sidebarLabel = QLabel(self.sidebarWidget)
+        self.sidebarLabel.setObjectName(u"sidebarLabel")
+        font = QFont()
+        font.setBold(True)
+        self.sidebarLabel.setFont(font)
 
-        self.verticalLayout.addWidget(self.tabWidget)
+        self.sidebarLayout.addWidget(self.sidebarLabel)
+
+        self.searchLabel = QLabel(self.sidebarWidget)
+        self.searchLabel.setObjectName(u"searchLabel")
+
+        self.sidebarLayout.addWidget(self.searchLabel)
+
+        self.searchEdit = QLineEdit(self.sidebarWidget)
+        self.searchEdit.setObjectName(u"searchEdit")
+        self.searchEdit.setClearButtonEnabled(True)
+
+        self.sidebarLayout.addWidget(self.searchEdit)
+
+        self.settingsStack = QStackedWidget(self.sidebarWidget)
+        self.settingsStack.setObjectName(u"settingsStack")
+        self.treeSettingsPage = QWidget()
+        self.treeSettingsPage.setObjectName(u"treeSettingsPage")
+        self.treeSettingsLayout = QVBoxLayout(self.treeSettingsPage)
+        self.treeSettingsLayout.setObjectName(u"treeSettingsLayout")
+        self.treeSettingsLabel = QLabel(self.treeSettingsPage)
+        self.treeSettingsLabel.setObjectName(u"treeSettingsLabel")
+
+        self.treeSettingsLayout.addWidget(self.treeSettingsLabel)
+
+        self.treeSettingsSpacer = QSpacerItem(20, 40, QSizePolicy.Policy.Minimum, QSizePolicy.Policy.Expanding)
+
+        self.treeSettingsLayout.addItem(self.treeSettingsSpacer)
+
+        self.settingsStack.addWidget(self.treeSettingsPage)
+        self.graphSettingsPage = QWidget()
+        self.graphSettingsPage.setObjectName(u"graphSettingsPage")
+        self.graphSettingsLayout = QVBoxLayout(self.graphSettingsPage)
+        self.graphSettingsLayout.setObjectName(u"graphSettingsLayout")
+        self.graphSettingsLabel = QLabel(self.graphSettingsPage)
+        self.graphSettingsLabel.setObjectName(u"graphSettingsLabel")
+
+        self.graphSettingsLayout.addWidget(self.graphSettingsLabel)
+
+        self.graphFilterConnectedCheck = QCheckBox(self.graphSettingsPage)
+        self.graphFilterConnectedCheck.setObjectName(u"graphFilterConnectedCheck")
+        self.graphFilterConnectedCheck.setChecked(True)
+
+        self.graphSettingsLayout.addWidget(self.graphFilterConnectedCheck)
+
+        self.graphSettingsSpacer = QSpacerItem(20, 40, QSizePolicy.Policy.Minimum, QSizePolicy.Policy.Expanding)
+
+        self.graphSettingsLayout.addItem(self.graphSettingsSpacer)
+
+        self.settingsStack.addWidget(self.graphSettingsPage)
+
+        self.sidebarLayout.addWidget(self.settingsStack)
+
+        self.mainSplitter.addWidget(self.sidebarWidget)
+
+        self.verticalLayout.addWidget(self.mainSplitter)
 
         self.statusLabel = QLabel(XslDependencyDialog)
         self.statusLabel.setObjectName(u"statusLabel")
+        sizePolicy = QSizePolicy(QSizePolicy.Policy.Preferred, QSizePolicy.Policy.Maximum)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.statusLabel.sizePolicy().hasHeightForWidth())
+        self.statusLabel.setSizePolicy(sizePolicy)
 
         self.verticalLayout.addWidget(self.statusLabel)
 
         self.buttonBox = QDialogButtonBox(XslDependencyDialog)
         self.buttonBox.setObjectName(u"buttonBox")
-        self.buttonBox.setOrientation(Qt.Horizontal)
-        self.buttonBox.setStandardButtons(QDialogButtonBox.Close)
+        self.buttonBox.setOrientation(Qt.Orientation.Horizontal)
+        self.buttonBox.setStandardButtons(QDialogButtonBox.StandardButton.Close)
         self.buttonBox.setCenterButtons(True)
 
         self.verticalLayout.addWidget(self.buttonBox)
@@ -133,6 +208,7 @@ class Ui_XslDependencyDialog(object):
         self.buttonBox.rejected.connect(XslDependencyDialog.reject)
 
         self.tabWidget.setCurrentIndex(0)
+        self.settingsStack.setCurrentIndex(0)
 
 
         QMetaObject.connectSlotsByName(XslDependencyDialog)
@@ -140,12 +216,23 @@ class Ui_XslDependencyDialog(object):
 
     def retranslateUi(self, XslDependencyDialog):
         XslDependencyDialog.setWindowTitle(QCoreApplication.translate("XslDependencyDialog", u"XSL-Abh\u00e4ngigkeitsgraph", None))
-        self.searchLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"Suche:", None))
-        self.searchEdit.setPlaceholderText(QCoreApplication.translate("XslDependencyDialog", u"XSL-Datei filtern...", None))
+#if QT_CONFIG(tooltip)
+        self.settingsButton.setToolTip(QCoreApplication.translate("XslDependencyDialog", u"Einstellungen ein-/ausblenden", None))
+#endif // QT_CONFIG(tooltip)
+        self.settingsButton.setText("")
         self.leftLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"XSL-Dateien", None))
         self.rightLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"Abh\u00e4ngigkeiten", None))
         self.tabWidget.setTabText(self.tabWidget.indexOf(self.treeTab), QCoreApplication.translate("XslDependencyDialog", u"Baumansicht", None))
         self.tabWidget.setTabText(self.tabWidget.indexOf(self.graphTab), QCoreApplication.translate("XslDependencyDialog", u"Netzwerkgraph", None))
+        self.sidebarLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"Einstellungen", None))
+        self.searchLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"Suche:", None))
+        self.searchEdit.setPlaceholderText(QCoreApplication.translate("XslDependencyDialog", u"XSL-Datei filtern...", None))
+        self.treeSettingsLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"Baumansicht-Einstellungen", None))
+        self.graphSettingsLabel.setText(QCoreApplication.translate("XslDependencyDialog", u"Graph-Einstellungen", None))
+        self.graphFilterConnectedCheck.setText(QCoreApplication.translate("XslDependencyDialog", u"Nur betroffene Dateien anzeigen", None))
+#if QT_CONFIG(tooltip)
+        self.graphFilterConnectedCheck.setToolTip(QCoreApplication.translate("XslDependencyDialog", u"Entfernt alle XSL-Dateien aus dem Graph, die nicht zum Suchbegriff passen und nicht direkt oder indirekt mit passenden Dateien verbunden sind", None))
+#endif // QT_CONFIG(tooltip)
         self.statusLabel.setText("")
     # retranslateUi
 

src/xsl_dependencies.py

@@ -7,13 +7,28 @@ Der Graph wird im Speicher gehalten und bei Änderungen (mtime) automatisch inva
 """
 
 import logging
-import re
+import time
+from lxml import etree
 from pathlib import Path
 
 logger = logging.getLogger(__name__)
 
-# Regex für xsl:import und xsl:include href-Attribute
-_IMPORT_INCLUDE_PATTERN = re.compile(r'<xsl:(?:import|include)\s+href=["\']([^"\']+)["\']', re.IGNORECASE)
+_XSL_NAMESPACE = "http://www.w3.org/1999/XSL/Transform"
+
+
+def _parse_import_include_hrefs(content: str) -> list[str]:
+    """Parst XSL-Dateiinhalt und gibt alle href-Werte von xsl:import/xsl:include zurück."""
+    try:
+        root = etree.fromstring(content.encode("utf-8"))
+    except etree.XMLSyntaxError:
+        return []
+    hrefs = []
+    for tag in ("import", "include"):
+        for elem in root.iter(f"{{{_XSL_NAMESPACE}}}{tag}"):
+            href = elem.get("href")
+            if href:
+                hrefs.append(href)
+    return hrefs
 
 
 class XslDependencyGraph:
@@ -84,8 +99,7 @@ class XslDependencyGraph:
             return result
 
         # Finde alle import/include-Referenzen
-        for match in _IMPORT_INCLUDE_PATTERN.finditer(content):
-            href = match.group(1)
+        for href in _parse_import_include_hrefs(content):
             referenced_path = (xsl_file.parent / href).resolve()
 
             if referenced_path.exists() and referenced_path not in visited:
@@ -138,12 +152,14 @@ class XslDependencyGraph:
         if not xsl_root_dir.exists():
             return graph
 
+        start = time.perf_counter()
         for xsl_file in sorted(xsl_root_dir.rglob("*.xsl")):
             xsl_file = xsl_file.resolve()
             deps = self.get_dependencies(xsl_file)
             graph[xsl_file] = deps
+        elapsed = time.perf_counter() - start
 
-        logger.info(f"Vollständiger XSL-Graph aufgebaut: {len(graph)} Dateien")
+        logger.info(f"Vollständiger XSL-Graph aufgebaut: {len(graph)} Dateien in {elapsed:.3f}s")
         return graph
 
     def _get_direct_dependencies(self, xsl_file: Path) -> set[Path]:
@@ -168,8 +184,7 @@ class XslDependencyGraph:
             logger.warning(f"Konnte XSL-Datei nicht lesen: {xsl_file} ({e})")
             return result
 
-        for match in _IMPORT_INCLUDE_PATTERN.finditer(content):
-            href = match.group(1)
+        for href in _parse_import_include_hrefs(content):
             referenced_path = (xsl_file.parent / href).resolve()
             if referenced_path.exists():
                 result.add(referenced_path)
@@ -191,11 +206,13 @@ class XslDependencyGraph:
         if not xsl_root_dir.exists():
             return graph
 
+        start = time.perf_counter()
         for xsl_file in sorted(xsl_root_dir.rglob("*.xsl")):
             xsl_file = xsl_file.resolve()
             graph[xsl_file] = self._get_direct_dependencies(xsl_file)
+        elapsed = time.perf_counter() - start
 
-        logger.info(f"Direkter XSL-Graph aufgebaut: {len(graph)} Dateien")
+        logger.info(f"Direkter XSL-Graph aufgebaut: {len(graph)} Dateien in {elapsed:.3f}s")
         return graph
 
     def invalidate(self, xsl_file: Path | None = None):