Added option to supply custom scrollpane for OverlayScrollPane.

core/build.gradle.kts

@@ -21,6 +21,7 @@ dependencies {
     testImplementation("com.miglayout:miglayout-swing")
     testImplementation("org.swinglabs:swingx")
     testImplementation("org.junit.jupiter:junit-jupiter-api")
+    testImplementation("com.fifesoft:rsyntaxtextarea:3.1.1")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
 }
 

core/src/main/java/com/github/weisj/darklaf/components/OverlayScrollPane.java

@@ -95,12 +95,10 @@ public class OverlayScrollPane extends JLayeredPane implements PropertyChangeLis
      * be controlled
      * with a pair of scrollbars. The scrollbars appear over the viewport.
      *
-     * @param view       the view of the component.
-     * @param scrollPane the scrollpane to use.
+     * @param scrollPane the scroll pane to use.
      */
-    public OverlayScrollPane(final JComponent view, final JScrollPane scrollPane) {
+    public OverlayScrollPane(final JScrollPane scrollPane) {
         this.scrollPane = scrollPane;
-        this.scrollPane.setViewportView(view);
         setupScrollPane(scrollPane);
         add(scrollPane, JLayeredPane.DEFAULT_LAYER);
 
@@ -117,10 +115,12 @@ public class OverlayScrollPane extends JLayeredPane implements PropertyChangeLis
         verticalScrollBar.putClientProperty(ScrollBarConstants.KEY_SCROLL_PANE_PARENT, this);
         JScrollBar horizontalScrollBar = createScrollBar(JScrollBar.HORIZONTAL);
         horizontalScrollBar.putClientProperty(ScrollBarConstants.KEY_SCROLL_PANE_PARENT, this);
-        scrollPane.setVerticalScrollBar(verticalScrollBar);
-        scrollPane.setHorizontalScrollBar(horizontalScrollBar);
         scrollPane.addPropertyChangeListener(this);
         updateScrollPaneUI();
+        scrollPane.setVerticalScrollBar(verticalScrollBar);
+        scrollPane.setHorizontalScrollBar(horizontalScrollBar);
+        scrollPane.setColumnHeader(scrollPane.getColumnHeader());
+        scrollPane.setRowHeader(scrollPane.getRowHeader());
     }
 
     protected JScrollBar createScrollBar(final int orientation) {

core/src/test/java/ui/scrollPane/OverlayRSyntaxScrollPane.java

@@ -0,0 +1,59 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+package ui.scrollPane;
+
+import java.awt.*;
+
+import javax.swing.*;
+
+import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
+import org.fife.ui.rtextarea.RTextScrollPane;
+
+import ui.ComponentDemo;
+import ui.DemoPanel;
+import ui.DemoResources;
+
+import com.github.weisj.darklaf.components.OverlayScrollPane;
+import com.github.weisj.darklaf.util.StringUtil;
+
+public class OverlayRSyntaxScrollPane implements ComponentDemo {
+
+    public static void main(final String[] args) {
+        ComponentDemo.showDemo(new OverlayRSyntaxScrollPane());
+    }
+
+    @Override
+    public JComponent createComponent() {
+        RSyntaxTextArea textArea = new RSyntaxTextArea(StringUtil.repeat(DemoResources.LOREM_IPSUM, 5));
+        RTextScrollPane sp = new RTextScrollPane(textArea);
+        OverlayScrollPane scrollPane = new OverlayScrollPane(sp);
+        return new DemoPanel(scrollPane, new BorderLayout(), 0);
+    }
+
+    @Override
+    public String getTitle() {
+        return "OverlayRSyntaxScrollPane Demo";
+    }
+}