athen---introduction-to-the-texteditor.md

@@ -49,10 +49,10 @@ This editor is fully event based, since time does not make sense in this scenari
 Writing such a component is not extremely hard but also requires some thinking. By no means i expect the code which im going to show here to be perfect, but i dont think it is extremely poor either. When writing a widget one needs to think of everything this widget should be capable of, we can list all those things as tasks:
 
 * changing the display based on the input
+* Managing horizontal and vertical scrollbars if required
 * Displaying a mouse cursor in the correct shape as long as it is located over the editor
 * Displaying the text in different Fonts (that is the type, its size and styling)
 * Allowing the user to wrap the editor lines, based on the current size of the widget
-* Managing horizontal and vertical scrollbars if required
 * Managing the caret and displaceing it whenever a click happens to a different location
 
 
@@ -138,3 +138,33 @@ This method is yet again very simple in itself. At first it saves the input, the
 
 ```
 
+We leave the method ```initData()``` for later, it is used to initialize Objects that are used in this widget. Teh next important method we need to check is the method ```initEventHandler()``` which is partly discussed in the next section.
+
+## Managing horizontal and vertical scrollbars if required
+
+If one inspects the code of ```initEventHandler()``` one can directly see the handling of the scrollbars.
+
+```java
+	private void initEventHandler() {
+
+		// listener to the vertical bar
+		if (this.getVerticalBar() != null) {
+			vBar = this.getVerticalBar();
+			vBar.addListener(SWT.Selection, e -> {
+				this.topLineOffset = vBar.getSelection();
+				drawWidget();
+			});
+			vBar.setVisible(false);
+		}
+
+		//listener to the horizontal bar
+		if (this.getHorizontalBar() != null) {
+			hBar = this.getHorizontalBar();
+			hBar.addListener(SWT.Selection, e -> {
+				this.leftMostPosition = hBar.getSelection();
+				drawWidget();
+			});
+			hBar.setVisible(false);
+		}
+
+```