--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface/src/org/eclipse/jface/viewers/DecoratingLabelProvider.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,424 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 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.DecoratingLabelProvider;
+
+import org.eclipse.jface.viewers.LabelProvider;
+import org.eclipse.jface.viewers.ILabelProvider;
+import org.eclipse.jface.viewers.IViewerLabelProvider;
+import org.eclipse.jface.viewers.IColorProvider;
+import org.eclipse.jface.viewers.IFontProvider;
+import org.eclipse.jface.viewers.ITreePathLabelProvider;
+import org.eclipse.jface.viewers.ILabelDecorator;
+import org.eclipse.jface.viewers.IDecorationContext;
+import org.eclipse.jface.viewers.ILabelProviderListener;
+import org.eclipse.jface.viewers.ViewerLabel;
+import org.eclipse.jface.viewers.TreePath;
+import org.eclipse.jface.viewers.DecorationContext;
+import org.eclipse.jface.viewers.LabelDecorator;
+import org.eclipse.jface.viewers.LabelProviderChangedEvent;
+import org.eclipse.jface.viewers.IDelayedLabelDecorator;
+import org.eclipse.jface.viewers.IColorDecorator;
+import org.eclipse.jface.viewers.IFontDecorator;
+
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.core.runtime.Assert;
+import org.eclipse.core.runtime.ListenerList;
+
+import java.lang.all;
+import java.util.Set;
+
+/**
+ * A decorating label provider is a label provider which combines
+ * a nested label provider and an optional decorator.
+ * The decorator decorates the label text, image, font and colors provided by
+ * the nested label provider.
+ */
+public class DecoratingLabelProvider : LabelProvider,
+        ILabelProvider, IViewerLabelProvider, IColorProvider, IFontProvider, ITreePathLabelProvider {
+
+    private ILabelProvider provider;
+
+    private ILabelDecorator decorator;
+
+    // Need to keep our own list of listeners
+    private ListenerList listeners;
+
+    private IDecorationContext decorationContext;
+
+    /**
+     * Creates a decorating label provider which uses the given label decorator
+     * to decorate labels provided by the given label provider.
+     *
+     * @param provider the nested label provider
+     * @param decorator the label decorator, or <code>null</code> if no decorator is to be used initially
+     */
+    public this(ILabelProvider provider,
+            ILabelDecorator decorator) {
+        decorationContext = DecorationContext.DEFAULT_CONTEXT;
+        listeners = new ListenerList();
+        Assert.isNotNull(cast(Object)provider);
+        this.provider = provider;
+        this.decorator = decorator;
+    }
+
+    /**
+     * The <code>DecoratingLabelProvider</code> implementation of this <code>IBaseLabelProvider</code> method
+     * adds the listener to both the nested label provider and the label decorator.
+     *
+     * @param listener a label provider listener
+     */
+    public override void addListener(ILabelProviderListener listener) {
+        super.addListener(listener);
+        provider.addListener(listener);
+        if (decorator !is null) {
+            decorator.addListener(listener);
+        }
+        listeners.add(cast(Object)listener);
+    }
+
+    /**
+     * The <code>DecoratingLabelProvider</code> implementation of this <code>IBaseLabelProvider</code> method
+     * disposes both the nested label provider and the label decorator.
+     */
+    public override void dispose() {
+        provider.dispose();
+        if (decorator !is null) {
+            decorator.dispose();
+        }
+    }
+
+    /**
+     * The <code>DecoratingLabelProvider</code> implementation of this
+     * <code>ILabelProvider</code> method returns the image provided
+     * by the nested label provider's <code>getImage</code> method,
+     * decorated with the decoration provided by the label decorator's
+     * <code>decorateImage</code> method.
+     */
+    public override Image getImage(Object element) {
+        Image image = provider.getImage(element);
+        if (decorator !is null) {
+            if ( auto ld2 = cast(LabelDecorator)decorator ) {
+                Image decorated = ld2.decorateImage(image, element, getDecorationContext());
+                if (decorated !is null) {
+                    return decorated;
+                }
+            } else {
+                Image decorated = decorator.decorateImage(image, element);
+                if (decorated !is null) {
+                    return decorated;
+                }
+            }
+        }
+        return image;
+    }
+
+    /**
+     * Returns the label decorator, or <code>null</code> if none has been set.
+     *
+     * @return the label decorator, or <code>null</code> if none has been set.
+     */
+    public ILabelDecorator getLabelDecorator() {
+        return decorator;
+    }
+
+    /**
+     * Returns the nested label provider.
+     *
+     * @return the nested label provider
+     */
+    public ILabelProvider getLabelProvider() {
+        return provider;
+    }
+
+    /**
+     * The <code>DecoratingLabelProvider</code> implementation of this
+     * <code>ILabelProvider</code> method returns the text label provided
+     * by the nested label provider's <code>getText</code> method,
+     * decorated with the decoration provided by the label decorator's
+     * <code>decorateText</code> method.
+     */
+    public override String getText(Object element) {
+        String text = provider.getText(element);
+        if (decorator !is null) {
+            if ( auto ld2 = cast(LabelDecorator)decorator ) {
+                String decorated = ld2.decorateText(text, element, getDecorationContext());
+                if (decorated !is null) {
+                    return decorated;
+                }
+            } else {
+                String decorated = decorator.decorateText(text, element);
+                if (decorated !is null) {
+                    return decorated;
+                }
+            }
+        }
+        return text;
+    }
+
+    /**
+     * The <code>DecoratingLabelProvider</code> implementation of this
+     * <code>IBaseLabelProvider</code> method returns <code>true</code> if the corresponding method
+     * on the nested label provider returns <code>true</code> or if the corresponding method on the
+     * decorator returns <code>true</code>.
+     */
+    public override bool isLabelProperty(Object element, String property) {
+        if (provider.isLabelProperty(element, property)) {
+            return true;
+        }
+        if (decorator !is null && decorator.isLabelProperty(element, property)) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * The <code>DecoratingLabelProvider</code> implementation of this <code>IBaseLabelProvider</code> method
+     * removes the listener from both the nested label provider and the label decorator.
+     *
+     * @param listener a label provider listener
+     */
+    public override void removeListener(ILabelProviderListener listener) {
+        super.removeListener(listener);
+        provider.removeListener(listener);
+        if (decorator !is null) {
+            decorator.removeListener(listener);
+        }
+        listeners.remove(cast(Object)listener);
+    }
+
+    /**
+     * Sets the label decorator.
+     * Removes all known listeners from the old decorator, and adds all known listeners to the new decorator.
+     * The old decorator is not disposed.
+     * Fires a label provider changed event indicating that all labels should be updated.
+     * Has no effect if the given decorator is identical to the current one.
+     *
+     * @param decorator the label decorator, or <code>null</code> if no decorations are to be applied
+     */
+    public void setLabelDecorator(ILabelDecorator decorator) {
+        ILabelDecorator oldDecorator = this.decorator;
+        if (oldDecorator !is decorator) {
+            Object[] listenerList = this.listeners.getListeners();
+            if (oldDecorator !is null) {
+                for (int i = 0; i < listenerList.length; ++i) {
+                    oldDecorator
+                            .removeListener(cast(ILabelProviderListener) listenerList[i]);
+                }
+            }
+            this.decorator = decorator;
+            if (decorator !is null) {
+                for (int i = 0; i < listenerList.length; ++i) {
+                    decorator
+                            .addListener(cast(ILabelProviderListener) listenerList[i]);
+                }
+            }
+            fireLabelProviderChanged(new LabelProviderChangedEvent(this));
+        }
+    }
+
+
+    /*
+     *  (non-Javadoc)
+     * @see org.eclipse.jface.viewers.IViewerLabelProvider#updateLabel(org.eclipse.jface.viewers.ViewerLabel, java.lang.Object)
+     */
+    public void updateLabel(ViewerLabel settings, Object element) {
+
+        ILabelDecorator currentDecorator = getLabelDecorator();
+        String oldText = settings.getText();
+        bool decorationReady = true;
+        if ( auto delayedDecorator = cast(IDelayedLabelDecorator)currentDecorator ) {
+            if (!delayedDecorator.prepareDecoration(element, oldText)) {
+                // The decoration is not ready but has been queued for processing
+                decorationReady = false;
+            }
+        }
+        // update icon and label
+
+        if (decorationReady || oldText is null
+                || settings.getText().length is 0) {
+            settings.setText(getText(element));
+        }
+
+        Image oldImage = settings.getImage();
+        if (decorationReady || oldImage is null) {
+            settings.setImage(getImage(element));
+        }
+
+        if(decorationReady) {
+            updateForDecorationReady(settings,element);
+        }
+
+    }
+
+    /**
+     * Decoration is ready. Update anything else for the settings.
+     * @param settings The object collecting the settings.
+     * @param element The Object being decorated.
+     * @since 3.1
+     */
+    protected void updateForDecorationReady(ViewerLabel settings, Object element) {
+
+        if( auto colorDecorator = cast(IColorDecorator) decorator ){
+            settings.setBackground(colorDecorator.decorateBackground(element));
+            settings.setForeground(colorDecorator.decorateForeground(element));
+        }
+
+        if( auto d = cast(IFontDecorator) decorator ) {
+            settings.setFont(d.decorateFont(element));
+        }
+
+    }
+
+    /* (non-Javadoc)
+     * @see org.eclipse.jface.viewers.IColorProvider#getBackground(java.lang.Object)
+     */
+    public Color getBackground(Object element) {
+        if( auto p = cast(IColorProvider) provider ) {
+            return p.getBackground(element);
+        }
+        return null;
+    }
+
+    /* (non-Javadoc)
+     * @see org.eclipse.jface.viewers.IFontProvider#getFont(java.lang.Object)
+     */
+    public Font getFont(Object element) {
+        if(auto p = cast(IFontProvider)provider ) {
+            return p.getFont(element);
+        }
+        return null;
+    }
+
+    /* (non-Javadoc)
+     * @see org.eclipse.jface.viewers.IColorProvider#getForeground(java.lang.Object)
+     */
+    public Color getForeground(Object element) {
+        if(auto p = cast(IColorProvider)provider ) {
+            return p.getForeground(element);
+        }
+        return null;
+    }
+
+    /**
+     * Return the decoration context associated with this label provider.
+     * It will be passed to the decorator if the decorator is an
+     * instance of {@link LabelDecorator}.
+     * @return the decoration context associated with this label provider
+     *
+     * @since 3.2
+     */
+    public IDecorationContext getDecorationContext() {
+        return decorationContext;
+    }
+
+    /**
+     * Set the decoration context that will be based to the decorator
+     * for this label provider if that decorator implements {@link LabelDecorator}.
+     * @param decorationContext the decoration context.
+     *
+     * @since 3.2
+     */
+    public void setDecorationContext(IDecorationContext decorationContext) {
+        Assert.isNotNull(cast(Object)decorationContext);
+        this.decorationContext = decorationContext;
+    }
+
+    /* (non-Javadoc)
+     * @see org.eclipse.jface.viewers.ITreePathLabelProvider#updateLabel(org.eclipse.jface.viewers.ViewerLabel, org.eclipse.jface.viewers.TreePath)
+     */
+    public void updateLabel(ViewerLabel settings, TreePath elementPath) {
+        ILabelDecorator currentDecorator = getLabelDecorator();
+        String oldText = settings.getText();
+        Object element = elementPath.getLastSegment();
+        bool decorationReady = true;
+        if ( auto labelDecorator = cast(LabelDecorator) currentDecorator ) {
+           if (!labelDecorator.prepareDecoration(element, oldText, getDecorationContext())) {
+                // The decoration is not ready but has been queued for processing
+                decorationReady = false;
+            }
+        } else if ( auto delayedDecorator = cast(IDelayedLabelDecorator) currentDecorator ) {
+            if (!delayedDecorator.prepareDecoration(element, oldText)) {
+                // The decoration is not ready but has been queued for processing
+                decorationReady = false;
+            }
+        }
+        settings.setHasPendingDecorations(!decorationReady);
+        // update icon and label
+
+        if ( auto pprov = cast(ITreePathLabelProvider) provider ) {
+            if (decorationReady || oldText is null
+                    || settings.getText().length is 0) {
+                pprov.updateLabel(settings, elementPath);
+                decorateSettings(settings, elementPath);
+            }
+        } else {
+            if (decorationReady || oldText is null
+                    || settings.getText().length is 0) {
+                settings.setText(getText(element));
+            }
+
+            Image oldImage = settings.getImage();
+            if (decorationReady || oldImage is null) {
+                settings.setImage(getImage(element));
+            }
+
+            if(decorationReady) {
+                updateForDecorationReady(settings,element);
+            }
+        }
+
+    }
+
+    /**
+     * Decorate the settings
+     * @param settings the settings obtained from the label provider
+     * @param elementPath the element path being decorated
+     */
+    private void decorateSettings(ViewerLabel settings, TreePath elementPath) {
+        Object element = elementPath.getLastSegment();
+        if (decorator !is null) {
+            if ( auto labelDecorator = cast(LabelDecorator) decorator ) {
+                String text = labelDecorator.decorateText(settings.getText(), element, getDecorationContext());
+                if (text !is null && text.length > 0)
+                    settings.setText(text);
+                Image image = labelDecorator.decorateImage(settings.getImage(), element, getDecorationContext());
+                if (image !is null)
+                    settings.setImage(image);
+
+            } else {
+                String text = decorator.decorateText(settings.getText(), element);
+                if (text !is null && text.length > 0)
+                    settings.setText(text);
+                Image image = decorator.decorateImage(settings.getImage(), element);
+                if (image !is null)
+                    settings.setImage(image);
+            }
+            if( auto colorDecorator = cast(IColorDecorator) decorator ){
+                Color background = colorDecorator.decorateBackground(element);
+                if (background !is null)
+                    settings.setBackground(background);
+                Color foreground = colorDecorator.decorateForeground(element);
+                if (foreground !is null)
+                    settings.setForeground(foreground);
+            }
+
+            if( auto fd = cast(IFontDecorator) decorator ) {
+                Font font = fd.decorateFont(element);
+                if (font !is null)
+                    settings.setFont(font);
+            }
+        }
+    }
+}