--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface/src/org/eclipse/jface/viewers/DelegatingStyledCellLabelProvider.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,238 @@
+/*******************************************************************************
+ * Copyright (c) 2008 IBM Corporation 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:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider;
+
+import org.eclipse.jface.viewers.StyledCellLabelProvider;
+import org.eclipse.jface.viewers.IBaseLabelProvider;
+import org.eclipse.jface.viewers.StyledString;
+import org.eclipse.jface.viewers.ViewerCell;
+import org.eclipse.jface.viewers.ILabelProviderListener;
+import org.eclipse.jface.viewers.IColorProvider;
+import org.eclipse.jface.viewers.IFontProvider;
+
+import org.eclipse.swt.custom.StyleRange;
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.Image;
+
+import java.lang.all;
+import java.util.Arrays;
+import java.util.Set;
+
+/**
+ * A {@link DelegatingStyledCellLabelProvider} is a
+ * {@link StyledCellLabelProvider} that delegates requests for the styled string
+ * and the image to a
+ * {@link DelegatingStyledCellLabelProvider.IStyledLabelProvider}.
+ *
+ * <p>
+ * Existing label providers can be enhanced by implementing
+ * {@link DelegatingStyledCellLabelProvider.IStyledLabelProvider} so they can be
+ * used in viewers with styled labels.
+ * </p>
+ *
+ * <p>
+ * The {@link DelegatingStyledCellLabelProvider.IStyledLabelProvider} can
+ * optionally implement {@link IColorProvider} and {@link IFontProvider} to
+ * provide foreground and background color and a default font.
+ * </p>
+ *
+ * @since 3.4
+ */
+public class DelegatingStyledCellLabelProvider : StyledCellLabelProvider {
+
+    /**
+     * Interface marking a label provider that provides styled text labels and
+     * images.
+     * <p>
+     * The {@link DelegatingStyledCellLabelProvider.IStyledLabelProvider} can
+     * optionally implement {@link IColorProvider} and {@link IFontProvider} to
+     * provide foreground and background color and a default font.
+     * </p>
+     */
+    public static interface IStyledLabelProvider : IBaseLabelProvider {
+
+        /**
+         * Returns the styled text label for the given element
+         *
+         * @param element
+         *            the element to evaluate the styled string for
+         *
+         * @return the styled string.
+         */
+        public StyledString getStyledText(Object element);
+
+        /**
+         * Returns the image for the label of the given element. The image is
+         * owned by the label provider and must not be disposed directly.
+         * Instead, dispose the label provider when no longer needed.
+         *
+         * @param element
+         *            the element for which to provide the label image
+         * @return the image used to label the element, or <code>null</code>
+         *         if there is no image for the given object
+         */
+        public Image getImage(Object element);
+    }
+
+    private IStyledLabelProvider styledLabelProvider;
+
+    /**
+     * Creates a {@link DelegatingStyledCellLabelProvider} that delegates the
+     * requests for the styled labels and the images to a
+     * {@link IStyledLabelProvider}.
+     *
+     * @param labelProvider
+     *            the label provider that provides the styled labels and the
+     *            images
+     */
+    public this(IStyledLabelProvider labelProvider) {
+        if (labelProvider is null)
+            throw new IllegalArgumentException(
+                    "Label provider must not be null"); //$NON-NLS-1$
+
+        this.styledLabelProvider = labelProvider;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.eclipse.jface.viewers.StyledCellLabelProvider#update(org.eclipse.jface.viewers.ViewerCell)
+     */
+    public void update(ViewerCell cell) {
+        Object element = cell.getElement();
+
+        StyledString styledString = getStyledText(element);
+        String newText= styledString.toString();
+
+        StyleRange[] oldStyleRanges= cell.getStyleRanges();
+        StyleRange[] newStyleRanges= isOwnerDrawEnabled() ? styledString.getStyleRanges() : null;
+
+        if (!Arrays.equals(oldStyleRanges, newStyleRanges)) {
+            cell.setStyleRanges(newStyleRanges);
+            if (cell.getText().equals(newText)) {
+                // make sure there will be a refresh from a change
+                cell.setText(""); //$NON-NLS-1$
+            }
+        }
+
+        cell.setText(newText);
+        cell.setImage(getImage(element));
+        cell.setFont(getFont(element));
+        cell.setForeground(getForeground(element));
+        cell.setBackground(getBackground(element));
+
+        // no super call required. changes on item will trigger the refresh.
+    }
+
+    /**
+     * Provides a foreground color for the given element.
+     *
+     * @param element
+     *            the element
+     * @return the foreground color for the element, or <code>null</code> to
+     *         use the default foreground color
+     */
+    public Color getForeground(Object element) {
+        if (null !is cast(IColorProvider)this.styledLabelProvider ) {
+            return (cast(IColorProvider) this.styledLabelProvider)
+                    .getForeground(element);
+        }
+        return null;
+    }
+
+    /**
+     * Provides a background color for the given element.
+     *
+     * @param element
+     *            the element
+     * @return the background color for the element, or <code>null</code> to
+     *         use the default background color
+     */
+    public Color getBackground(Object element) {
+        if (null !is cast(IColorProvider)this.styledLabelProvider) {
+            return (cast(IColorProvider) this.styledLabelProvider)
+                    .getBackground(element);
+        }
+        return null;
+    }
+
+    /**
+     * Provides a font for the given element.
+     *
+     * @param element
+     *            the element
+     * @return the font for the element, or <code>null</code> to use the
+     *         default font
+     */
+    public Font getFont(Object element) {
+        if (null !is cast(IFontProvider)this.styledLabelProvider ) {
+            return (cast(IFontProvider) this.styledLabelProvider).getFont(element);
+        }
+        return null;
+    }
+
+    /**
+     * Returns the image for the label of the given element. The image is owned
+     * by the label provider and must not be disposed directly. Instead, dispose
+     * the label provider when no longer needed.
+     *
+     * @param element
+     *            the element for which to provide the label image
+     * @return the image used to label the element, or <code>null</code> if
+     *         there is no image for the given object
+     */
+    public Image getImage(Object element) {
+        return this.styledLabelProvider.getImage(element);
+    }
+
+    /**
+     * Returns the styled text for the label of the given element.
+     *
+     * @param element
+     *            the element for which to provide the styled label text
+     * @return the styled text string used to label the element
+     */
+    protected StyledString getStyledText(Object element) {
+        return this.styledLabelProvider.getStyledText(element);
+    }
+
+    /**
+     * Returns the styled string provider.
+     *
+     * @return the wrapped label provider
+     */
+    public IStyledLabelProvider getStyledStringProvider() {
+        return this.styledLabelProvider;
+    }
+
+    public void addListener(ILabelProviderListener listener) {
+        super.addListener(listener);
+        this.styledLabelProvider.addListener(listener);
+    }
+
+    public void removeListener(ILabelProviderListener listener) {
+        super.removeListener(listener);
+        this.styledLabelProvider.removeListener(listener);
+    }
+
+    public bool isLabelProperty(Object element, String property) {
+        return this.styledLabelProvider.isLabelProperty(element, property);
+    }
+
+    public void dispose() {
+        super.dispose();
+        this.styledLabelProvider.dispose();
+    }
+
+}