rabbit.ui.internal.viewers.PageDescriptorLabelProvider.java Source code

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Here is the source code for rabbit.ui.internal.viewers.PageDescriptorLabelProvider.java

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/*
 * Copyright 2010 The Rabbit Eclipse Plug-in Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package rabbit.ui.internal.viewers;

import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.StyledCellLabelProvider;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.graphics.Image;

import rabbit.ui.internal.util.PageDescriptor;

/**
 * Label provider for {@link PageDescriptor}.
 */
public class PageDescriptorLabelProvider extends StyledCellLabelProvider implements ILabelProvider {

    private final ImageRegistry images;

    /** Constructs a new label provider. */
    public PageDescriptorLabelProvider() {
        images = new ImageRegistry();
    }

    @Override
    public void dispose() {
        super.dispose();
        images.dispose();
    }

    @Override
    public Image getImage(Object element) {
        if (!(element instanceof PageDescriptor)) {
            return null;
        }

        PageDescriptor page = (PageDescriptor) element;
        if (page.getImage() == null) {
            return null;
        }
        Image image = images.get(page.getName());
        if (image == null) {
            image = page.getImage().createImage();
            images.put(page.getName(), image);
        }
        return image;
    }

    @Override
    public String getText(Object element) {
        if (!(element instanceof PageDescriptor)) {
            return element.toString();
        }
        return ((PageDescriptor) element).getName();
    }

    @Override
    public String getToolTipText(Object element) {
        if (!(element instanceof PageDescriptor)) {
            return super.getToolTipText(element);
        }
        return ((PageDescriptor) element).getDescription();
    }

    @Override
    public void update(ViewerCell cell) {
        super.update(cell);
        cell.setText(getText(cell.getElement()));
        cell.setImage(getImage(cell.getElement()));
    }

    @Override
    public boolean useNativeToolTip(Object object) {
        return true;
    }
}