--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jface/snippets/Snippet014TreeViewerNoMandatoryLabelProvider.d	Wed Aug 06 10:03:06 2008 +0800
@@ -0,0 +1,227 @@
+/*******************************************************************************
+ * Copyright (c) 2006 Tom Schindl and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tom Schindl - initial API and implementation
+ * Port to the D programming language:
+ *     yidabu at gmail dot com  ( D China http://www.d-programming-language-china.org/ ) 
+ *******************************************************************************/
+
+module jface.snippets.Snippet014TreeViewerNoMandatoryLabelProvider;
+
+
+import dwtx.jface.resource.FontRegistry;
+import dwtx.jface.viewers.ITableColorProvider;
+import dwtx.jface.viewers.ITableFontProvider;
+import dwtx.jface.viewers.ITableLabelProvider;
+import dwtx.jface.viewers.ITreeContentProvider;
+import dwtx.jface.viewers.LabelProvider;
+import dwtx.jface.viewers.TreeViewer;
+import dwtx.jface.viewers.Viewer;
+import dwt.DWT;
+import dwt.graphics.Color;
+import dwt.graphics.Font;
+import dwt.graphics.Image;
+import dwt.layout.FillLayout;
+import dwt.widgets.Display;
+import dwt.widgets.Shell;
+import dwt.widgets.TreeColumn;
+
+import dwt.dwthelper.utils;
+
+import tango.util.Convert;
+import tango.util.container.LinkedList;
+
+
+
+void main(String[] args) {
+    Display display = new Display();
+    Shell shell = new Shell(display);
+    shell.setLayout(new FillLayout());
+    new Snippet014TreeViewerNoMandatoryLabelProvider(shell);
+    shell.open();
+
+    while (!shell.isDisposed()) {
+        if (!display.readAndDispatch())
+            display.sleep();
+    }
+
+    display.dispose();
+}
+
+/**
+ * A simple TreeViewer to demonstrate usage
+ * 
+ * @author Tom Schindl <tom.schindl@bestsolution.at>
+ * 
+ */
+public class Snippet014TreeViewerNoMandatoryLabelProvider {
+    alias  LinkedList!(MyModel) ArrayList;
+    
+	private class MyContentProvider : ITreeContentProvider {
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
+		 */
+		public Object[] getElements(Object inputElement) {
+			return (cast(MyModel) inputElement).child.toArray();
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.IContentProvider#dispose()
+		 */
+		public void dispose() {
+
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.IContentProvider#inputChanged(dwtx.jface.viewers.Viewer,
+		 *      java.lang.Object, java.lang.Object)
+		 */
+		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
+		 */
+		public Object[] getChildren(Object parentElement) {
+			return getElements(parentElement);
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
+		 */
+		public Object getParent(Object element) {
+			if (element is null) {
+				return null;
+			}
+
+			return (cast(MyModel) element).parent;
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
+		 */
+		public bool hasChildren(Object element) {
+			return (cast(MyModel) element).child.size() > 0;
+		}
+
+	}
+
+	public class MyModel {
+		public MyModel parent;
+
+		public ArrayList child;
+
+		public int counter;
+
+		public this(int counter, MyModel parent) {
+			this.parent = parent;
+			this.counter = counter;
+            child = new ArrayList();
+		}
+
+		public String toString() {
+			String rv = "Item ";
+			if (parent !is null) {
+				rv = parent.toString() ~ ".";
+			}
+
+			rv ~= to!(String)(counter);
+
+			return rv;
+		}
+	}
+
+	public class MyLabelProvider : LabelProvider,
+			ITableLabelProvider, ITableFontProvider, ITableColorProvider {
+		FontRegistry registry;
+        this()
+        {
+            registry = new FontRegistry();                    
+        }
+
+		public Image getColumnImage(Object element, int columnIndex) {
+			return null;
+		}
+
+		public String getColumnText(Object element, int columnIndex) {
+			return "Column " ~ to!(String)(columnIndex) ~ " => " ~ element.toString();
+		}
+
+		public Font getFont(Object element, int columnIndex) {
+			if ((cast(MyModel) element).counter % 2 == 0) {
+				return registry.getBold(Display.getCurrent().getSystemFont()
+						.getFontData()[0].getName());
+			}
+			return null;
+		}
+
+		public Color getBackground(Object element, int columnIndex) {
+			if ((cast(MyModel) element).counter % 2 == 0) {
+				return Display.getCurrent().getSystemColor(DWT.COLOR_RED);
+			}
+			return null;
+		}
+
+		public Color getForeground(Object element, int columnIndex) {
+			if ((cast(MyModel) element).counter % 2 == 1) {
+				return Display.getCurrent().getSystemColor(DWT.COLOR_RED);
+			}
+			return null;
+		}
+
+	}
+
+	public this(Shell shell) {
+		final TreeViewer v = new TreeViewer(shell);
+		
+		TreeColumn column = new TreeColumn(v.getTree(),DWT.NONE);
+		column.setWidth(200);
+		column.setText("Column 1");
+		
+		column = new TreeColumn(v.getTree(),DWT.NONE);
+		column.setWidth(200);
+		column.setText("Column 2");
+		
+		v.setLabelProvider(new MyLabelProvider());
+		v.setContentProvider(new MyContentProvider());
+		v.setInput(createModel());
+	}
+
+	private MyModel createModel() {
+
+		MyModel root = new MyModel(0, null);
+		root.counter = 0;
+
+		MyModel tmp;
+		for (int i = 1; i < 10; i++) {
+			tmp = new MyModel(i, root);
+			root.child.add(tmp);
+			for (int j = 1; j < i; j++) {
+				tmp.child.add(new MyModel(j, tmp));
+			}
+		}
+
+		return root;
+	}
+
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jface/snippets/Snippet026TreeViewerTabEditing.d	Wed Aug 06 10:03:06 2008 +0800
@@ -0,0 +1,294 @@
+/*******************************************************************************
+ * Copyright (c) 2006 Tom Schindl and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tom Schindl - initial API and implementation
+ * Port to the D programming language:
+ *     yidabu at gmail dot com  ( D China http://www.d-programming-language-china.org/ ) 
+ *******************************************************************************/
+
+module jface.snippets.Snippet026TreeViewerTabEditing;
+
+
+import dwtx.jface.viewers.CellEditor;
+import dwtx.jface.viewers.ColumnLabelProvider;
+import dwtx.jface.viewers.ColumnViewerEditor;
+import dwtx.jface.viewers.ColumnViewer;
+import dwtx.jface.viewers.ColumnViewerEditorActivationStrategy;
+import dwtx.jface.viewers.EditingSupport;
+import dwtx.jface.viewers.ColumnViewerEditorActivationEvent;
+import dwtx.jface.viewers.FocusCellOwnerDrawHighlighter;
+import dwtx.jface.viewers.ITreeContentProvider;
+import dwtx.jface.viewers.TextCellEditor;
+import dwtx.jface.viewers.TreePath;
+import dwtx.jface.viewers.TreeViewerFocusCellManager;
+import dwtx.jface.viewers.TreeViewerEditor;
+import dwtx.jface.viewers.TreeViewer;
+import dwtx.jface.viewers.TreeViewerColumn;
+import dwtx.jface.viewers.Viewer;
+import dwt.DWT;
+import dwt.events.SelectionEvent;
+import dwt.events.SelectionListener;
+import dwt.layout.FillLayout;
+import dwt.widgets.Button;
+import dwt.widgets.Display;
+import dwt.widgets.Shell;
+
+import dwt.dwthelper.utils;
+
+import tango.util.Convert;
+import tango.util.container.LinkedList;
+
+
+void main(String[] args) {
+    Display display = new Display();
+    Shell shell = new Shell(display);
+    shell.setLayout(new FillLayout());
+    new Snippet026TreeViewerTabEditing(shell);
+    shell.open();
+
+    while (!shell.isDisposed()) {
+        if (!display.readAndDispatch())
+            display.sleep();
+    }
+
+    display.dispose();
+}
+
+/**
+ * A simple TreeViewer to demonstrate usage
+ * 
+ * @author Tom Schindl <tom.schindl@bestsolution.at>
+ * 
+ */
+public class Snippet026TreeViewerTabEditing {
+    alias  LinkedList!(MyModel) ArrayList;    
+	public this(Shell shell) {
+		Button b = new Button(shell,DWT.PUSH);
+		b.setText("Remove column");
+		final TreeViewer v = new TreeViewer(shell, DWT.BORDER
+				| DWT.FULL_SELECTION);
+		v.getTree().setLinesVisible(true);
+		v.getTree().setHeaderVisible(true);
+		b.addSelectionListener(new class(v) SelectionListener {
+            TreeViewer v;
+            this(TreeViewer v_)
+            {
+                this.v = v_;
+            }
+			public void widgetDefaultSelected(SelectionEvent e) {
+				
+			}
+
+			public void widgetSelected(SelectionEvent e) {
+				v.getTree().getColumn(1).dispose();
+			}
+			
+		});
+				 
+		TreeViewerFocusCellManager focusCellManager = new TreeViewerFocusCellManager(v,new FocusCellOwnerDrawHighlighter(v));
+		ColumnViewerEditorActivationStrategy actSupport = new class(v) ColumnViewerEditorActivationStrategy {
+            this(ColumnViewer v_)
+            {
+                super(v_);
+            }
+			protected bool isEditorActivationEvent(
+					ColumnViewerEditorActivationEvent event) {
+				return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL
+						|| event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
+						|| (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == DWT.CR)
+						|| event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
+			}
+		};
+		
+		TreeViewerEditor.create(v, focusCellManager, actSupport, ColumnViewerEditor.TABBING_HORIZONTAL
+				| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
+				| ColumnViewerEditor.TABBING_VERTICAL | ColumnViewerEditor.KEYBOARD_ACTIVATION);
+		
+		final TextCellEditor textCellEditor = new TextCellEditor(v.getTree());
+
+		TreeViewerColumn column = new TreeViewerColumn(v, DWT.NONE);
+		column.getColumn().setWidth(200);
+		column.getColumn().setMoveable(true);
+		column.getColumn().setText("Column 1");
+		column.setLabelProvider(new class() ColumnLabelProvider {
+
+			public String getText(Object element) {
+				return "Column 1 => " ~ element.toString();
+			}
+
+		});
+		column.setEditingSupport(new class(v) EditingSupport {
+            this(ColumnViewer v_)
+            {
+                super(v_);
+            }
+			protected bool canEdit(Object element) {
+				return false;
+			}
+
+			protected CellEditor getCellEditor(Object element) {
+				return textCellEditor;
+			}
+
+			protected Object getValue(Object element) {
+				return stringcast( (to!(String)((cast(MyModel) element).counter)) );
+			}
+
+			protected void setValue(Object element, Object value) {
+				(cast(MyModel) element).counter = Integer.parseInt(value.toString());
+				v.update(element, null);
+			}
+		});
+
+		column = new TreeViewerColumn(v, DWT.NONE);
+		column.getColumn().setWidth(200);
+		column.getColumn().setMoveable(true);
+		column.getColumn().setText("Column 2");
+		column.setLabelProvider(new class() ColumnLabelProvider {
+
+			public String getText(Object element) {
+				return "Column 2 => " ~ element.toString();
+			}
+
+		});
+		column.setEditingSupport(new class(v) EditingSupport {
+            this(ColumnViewer v_)
+            {
+                super(v_);
+            }
+			protected bool canEdit(Object element) {
+				return true;
+			}
+
+			protected CellEditor getCellEditor(Object element) {
+				return textCellEditor;
+			}
+
+			protected Object getValue(Object element) {
+				return stringcast( to!(String)((cast(MyModel) element).counter) );
+			}
+
+			protected void setValue(Object element, Object value) {
+				(cast(MyModel) element).counter = Integer.parseInt(value.toString());
+				v.update(element, null);
+			}
+		});
+		
+		column = new TreeViewerColumn(v, DWT.NONE);
+		column.getColumn().setWidth(200);
+		column.getColumn().setMoveable(true);
+		column.getColumn().setText("Column 3");
+		column.setLabelProvider(new class() ColumnLabelProvider {
+			public String getText(Object element) {
+				return "Column 3 => " ~ element.toString();
+			}
+
+		});
+		column.setEditingSupport(new class(v) EditingSupport {
+            this(ColumnViewer v_)
+            {
+                super(v_);
+            }
+			protected bool canEdit(Object element) {
+				return true;
+			}
+
+			protected CellEditor getCellEditor(Object element) {
+				return textCellEditor;
+			}
+
+			protected Object getValue(Object element) {
+				return stringcast( to!(String)((cast(MyModel) element).counter) );
+			}
+
+			protected void setValue(Object element, Object value) {
+				(cast(MyModel) element).counter = Integer.parseInt(value.toString());
+				v.update(element, null);
+			}
+		});
+		
+		v.setContentProvider(new MyContentProvider());
+
+		v.setInput(createModel());
+	}
+
+	private MyModel createModel() {
+
+		MyModel root = new MyModel(0, null);
+		root.counter = 0;
+
+		MyModel tmp;
+		MyModel subItem;
+		for (int i = 1; i < 10; i++) {
+			tmp = new MyModel(i, root);
+			root.child.add(tmp);
+			for (int j = 1; j < i; j++) {
+				subItem = new MyModel(j, tmp);
+				subItem.child.add(new MyModel(j * 100, subItem));
+				tmp.child.add(subItem);
+			}
+		}
+
+		return root;
+	}
+
+	private class MyContentProvider : ITreeContentProvider {
+
+		public Object[] getElements(Object inputElement) {
+			return (cast(MyModel) inputElement).child.toArray();
+		}
+
+		public void dispose() {
+		}
+
+		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+		}
+
+		public Object[] getChildren(Object parentElement) {
+			return getElements(parentElement);
+		}
+
+		public Object getParent(Object element) {
+			if (element is null) {
+				return null;
+			}
+			return (cast(MyModel) element).parent;
+		}
+
+		public bool hasChildren(Object element) {
+			return (cast(MyModel) element).child.size() > 0;
+		}
+
+	}
+
+	public class MyModel {
+		public MyModel parent;
+
+		public ArrayList child;
+
+		public int counter;
+
+		public this(int counter, MyModel parent) {
+			this.parent = parent;
+			this.counter = counter;
+            child = new ArrayList();            
+		}
+
+		public String toString() {
+			String rv = "Item ";
+			if (parent !is null) {
+				rv = parent.toString() ~ ".";
+			}
+
+			rv ~= to!(String)(counter);
+
+			return rv;
+		}
+	}
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jface/snippets/Snippet043NoColumnTreeViewerKeyboardEditing.d	Wed Aug 06 10:03:06 2008 +0800
@@ -0,0 +1,220 @@
+/*******************************************************************************
+ * Copyright (c) 2006 Tom Schindl and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tom Schindl - initial API and implementation
+ * Port to the D programming language:
+ *     yidabu at gmail dot com  ( D China http://www.d-programming-language-china.org/ ) 
+ *******************************************************************************/
+
+module dwtx.jface.snippets.Snippet043NoColumnTreeViewerKeyboardEditing;
+
+import dwtx.jface.viewers.CellEditor;
+import dwtx.jface.viewers.ColumnViewerEditor;
+import dwtx.jface.viewers.ColumnViewer;
+import dwtx.jface.viewers.ColumnViewerEditorActivationStrategy;
+import dwtx.jface.viewers.ColumnViewerEditorActivationEvent;
+import dwtx.jface.viewers.FocusCellOwnerDrawHighlighter;
+import dwtx.jface.viewers.ICellModifier;
+import dwtx.jface.viewers.ITreeContentProvider;
+import dwtx.jface.viewers.TextCellEditor;
+import dwtx.jface.viewers.TreePath;
+import dwtx.jface.viewers.TreeViewerFocusCellManager;
+import dwtx.jface.viewers.TreeViewerEditor;
+import dwtx.jface.viewers.TreeViewer;
+import dwtx.jface.viewers.Viewer;
+import dwt.DWT;
+import dwt.events.SelectionEvent;
+import dwt.events.SelectionListener;
+import dwt.layout.FillLayout;
+import dwt.widgets.Button;
+import dwt.widgets.Display;
+import dwt.widgets.Item;
+import dwt.widgets.Shell;
+
+import dwt.dwthelper.utils;
+
+import tango.util.Convert;
+import tango.util.container.LinkedList;
+
+
+void main(String[] args) {
+    Display display = new Display();
+    Shell shell = new Shell(display);
+    shell.setLayout(new FillLayout());
+    new Snippet043NoColumnTreeViewerKeyboardEditing(shell);
+    shell.open();
+
+    while (!shell.isDisposed()) {
+        if (!display.readAndDispatch())
+            display.sleep();
+    }
+
+    display.dispose();
+}
+    
+/**
+ * Demonstrates how to use keyboard-editing support in a TreeViewer with no column
+ * 
+ * @author Tom Schindl <tom.schindl@bestsolution.at>
+ * 
+ */
+public class Snippet043NoColumnTreeViewerKeyboardEditing {
+    alias LinkedList!(MyModel) ArrayList;
+	public this(Shell shell) {
+		Button b = new Button(shell, DWT.PUSH);
+		b.setText("BBB");
+		final TreeViewer v = new TreeViewer(shell, DWT.BORDER
+				| DWT.FULL_SELECTION);
+		b.addSelectionListener(new class(v) SelectionListener {
+            TreeViewer v;
+            this(TreeViewer v_)
+            {
+                this.v = v_;
+            }
+            
+			public void widgetDefaultSelected(SelectionEvent e) {
+
+			}
+
+			public void widgetSelected(SelectionEvent e) {
+				MyModel root = cast(MyModel) v.getInput();
+				TreePath path = new TreePath([ root, root.child.get(1),
+						(cast(MyModel) root.child.get(1)).child.get(0)] );
+				v.editElement(path, 0);
+			}
+
+		});
+
+		v.setCellEditors([ new TextCellEditor(v.getTree()) ]);
+		v.setColumnProperties(["col1"]);
+		v.setCellModifier(new class(v) ICellModifier {
+            TreeViewer v;
+            this(TreeViewer v_)
+            {
+                this.v = v_;
+            }
+			public bool canModify(Object element, String property) {
+				return true;
+			}
+
+			public Object getValue(Object element, String property) {
+				return stringcast( to!(String)((cast(MyModel) element).counter) ~ "" );
+			}
+
+			public void modify(Object element, String property, Object value) {
+				element = (cast(Item) element).getData();
+				(cast(MyModel) element).counter = Integer.parseInt(value.toString());
+				v.update(element, null);
+			}
+
+		});
+
+		TreeViewerFocusCellManager focusCellManager = new TreeViewerFocusCellManager(
+				v, new FocusCellOwnerDrawHighlighter(v));
+		ColumnViewerEditorActivationStrategy actSupport = new class(v) ColumnViewerEditorActivationStrategy {
+            this(ColumnViewer v)
+            {
+                super(v);
+            }
+			protected bool isEditorActivationEvent(
+					ColumnViewerEditorActivationEvent event) {
+				return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL
+						|| event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
+						|| (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == DWT.CR)
+						|| event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
+			}
+		};
+
+		TreeViewerEditor.create(v, focusCellManager, actSupport,
+				ColumnViewerEditor.TABBING_HORIZONTAL
+						| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
+						| ColumnViewerEditor.TABBING_VERTICAL
+						| ColumnViewerEditor.KEYBOARD_ACTIVATION);
+
+		v.setContentProvider(new MyContentProvider());
+
+		v.setInput(createModel());
+	}
+
+	private MyModel createModel() {
+
+		MyModel root = new MyModel(0, null);
+		root.counter = 0;
+
+		MyModel tmp;
+		MyModel subItem;
+		for (int i = 1; i < 10; i++) {
+			tmp = new MyModel(i, root);
+			root.child.add(tmp);
+			for (int j = 1; j < i; j++) {
+				subItem = new MyModel(j, tmp);
+				subItem.child.add(new MyModel(j * 100, subItem));
+				tmp.child.add(subItem);
+			}
+		}
+
+		return root;
+	}
+
+
+
+	private class MyContentProvider : ITreeContentProvider {
+
+		public Object[] getElements(Object inputElement) {
+			return (cast(MyModel) inputElement).child.toArray();
+		}
+
+		public void dispose() {
+		}
+
+		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+		}
+
+		public Object[] getChildren(Object parentElement) {
+			return getElements(parentElement);
+		}
+
+		public Object getParent(Object element) {
+			if (element is null) {
+				return null;
+			}
+			return (cast(MyModel) element).parent;
+		}
+
+		public bool hasChildren(Object element) {
+			return (cast(MyModel) element).child.size() > 0;
+		}
+
+	}
+
+	public class MyModel {
+		public MyModel parent;
+
+		public ArrayList child;
+
+		public int counter;
+
+		public this(int counter_, MyModel parent_) {
+			this.parent = parent_;
+			this.counter = counter_;
+            child = new ArrayList();
+		}
+
+		public String toString() {
+			String rv = "Item ";
+			if (parent !is null) {
+				rv = parent.toString() ~ ".";
+			}
+
+			rv ~= to!(String)(counter);
+
+			return rv;
+		}
+	}
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jface/snippets/Snippet047VirtualLazyTreeViewer.d	Wed Aug 06 10:03:06 2008 +0800
@@ -0,0 +1,184 @@
+/*******************************************************************************
+ * Copyright (c) 2006 Tom Schindl and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tom Schindl - initial API and implementation
+ * Port to the D programming language:
+ *     yidabu at gmail dot com  ( D China http://www.d-programming-language-china.org/ ) 
+ *******************************************************************************/
+
+module jface.snippets.Snippet047VirtualLazyTreeViewer;
+
+import dwtx.jface.viewers.ILazyTreeContentProvider;
+import dwtx.jface.viewers.LabelProvider;
+import dwtx.jface.viewers.TreeViewer;
+import dwtx.jface.viewers.Viewer;
+import dwt.DWT;
+import dwt.layout.FillLayout;
+import dwt.widgets.Display;
+import dwt.widgets.Shell;
+
+import dwt.dwthelper.utils;
+
+import tango.util.Convert;
+import tango.util.container.LinkedList;
+
+
+/**
+ * @param args
+ */
+void main(String[] args) {
+    Display display = new Display();
+    Shell shell = new Shell(display);
+    shell.setLayout(new FillLayout());
+    new Snippet047VirtualLazyTreeViewer(shell);
+    shell.open();
+
+    while (!shell.isDisposed()) {
+        if (!display.readAndDispatch())
+            display.sleep();
+    }
+
+    display.dispose();
+
+}
+
+/**
+ * A simple TreeViewer to demonstrate usage of an ILazyContentProvider.
+ * 
+ */
+public class Snippet047VirtualLazyTreeViewer {
+    alias ArrayWrapperT!(IntermediateNode)  ArrayWrapperIntermediateNode;    
+    alias ArrayWrapperT!(LeafNode)  ArrayWrapperLeafNode;  
+    
+	private class MyContentProvider : ILazyTreeContentProvider {
+		private TreeViewer viewer;
+		private IntermediateNode[] elements;
+
+		public this(TreeViewer viewer) {
+			this.viewer = viewer;
+		}
+
+		public void dispose() {
+
+		}
+
+		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+            if(cast(ArrayWrapperIntermediateNode) newInput)
+                this.elements = (cast(ArrayWrapperIntermediateNode) newInput).array;
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.ILazyTreeContentProvider#getParent(java.lang.Object)
+		 */
+		public Object getParent(Object element) {
+			if (cast(LeafNode)element)
+				return (cast(LeafNode) element).parent;
+			return new ArrayWrapperIntermediateNode(elements);
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.ILazyTreeContentProvider#updateChildCount(java.lang.Object,
+		 *      int)
+		 */
+		public void updateChildCount(Object element, int currentChildCount) {
+			
+			int length = 0;
+			if (cast(IntermediateNode)element) {
+				IntermediateNode node = cast(IntermediateNode) element;
+				length =  node.children.length;
+			} 
+            /// TODO: fix me  access violation here
+			if(element !is null && elements !is null && (cast(ArrayWrapperIntermediateNode)element) && (cast(ArrayWrapperIntermediateNode)element).array is elements)
+				length = elements.length;
+			viewer.setChildCount(element, length);    
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * 
+		 * @see dwtx.jface.viewers.ILazyTreeContentProvider#updateElement(java.lang.Object,
+		 *      int)
+		 */
+		public void updateElement(Object parent, int index) {
+			
+			Object element;
+			if (cast(IntermediateNode)parent) 
+				element = (cast(IntermediateNode) parent).children[index];
+			
+			else
+				element =  elements[index];
+			viewer.replace(parent, index, element);
+			updateChildCount(element, -1);
+			
+		}
+
+	}
+
+	public class LeafNode {
+		public int counter;
+		public IntermediateNode parent;
+
+		public this(int counter, IntermediateNode parent) {
+			this.counter = counter;
+			this.parent = parent;
+		}
+
+		public String toString() {
+			return "Leaf " ~ to!(String)(this.counter);
+		}
+	}
+
+	public class IntermediateNode {
+		public int counter;
+		public LeafNode[] children;
+
+		public this(int counter) {
+			this.counter = counter;
+            children = new LeafNode[0];
+		}
+
+		public String toString() {
+			return "Node " ~ to!(String)(this.counter);
+		}
+
+		public void generateChildren(int i) {
+			children = new LeafNode[i];
+			for (int j = 0; j < i; j++) {
+				children[j] = new LeafNode(j, this);
+			}
+
+		}
+	}
+
+	public this(Shell shell) {
+		final TreeViewer v = new TreeViewer(shell, DWT.VIRTUAL | DWT.BORDER);
+		v.setLabelProvider(new LabelProvider());
+		v.setContentProvider(new MyContentProvider(v));
+		v.setUseHashlookup(true);
+		IntermediateNode[] model = createModel();
+		v.setInput(new ArrayWrapperIntermediateNode(model));
+		v.getTree().setItemCount(model.length);
+
+	}
+
+	private IntermediateNode[] createModel() {
+		IntermediateNode[] elements = new IntermediateNode[10];
+
+		for (int i = 0; i < 10; i++) {
+			elements[i] = new IntermediateNode(i);
+			elements[i].generateChildren(1000);
+		}
+
+		return elements;
+	}
+
+}
\ No newline at end of file