io.pelle.mango.client.gwt.modules.dictionary.container.ImageActionCell.java Source code

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Here is the source code for io.pelle.mango.client.gwt.modules.dictionary.container.ImageActionCell.java

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/**
 * Copyright (c) 2013 Christian Pelster.
 * 
 * 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:
 *     Christian Pelster - initial API and implementation
 */
package io.pelle.mango.client.gwt.modules.dictionary.container;

import io.pelle.mango.client.base.modules.dictionary.container.IBaseTable;
import io.pelle.mango.client.base.util.SimpleCallback;
import io.pelle.mango.client.base.vo.IBaseVO;
import io.pelle.mango.client.gwt.GwtStyles;

import java.util.HashSet;
import java.util.Set;

import com.google.gwt.cell.client.AbstractCell;
import com.google.gwt.cell.client.ValueUpdater;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.MouseOutEvent;
import com.google.gwt.event.dom.client.MouseOverEvent;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.user.client.ui.Image;

public class ImageActionCell<VOType extends IBaseVO> extends AbstractCell<Void> {
    private Image image;

    private final ImageResource imageResource;

    private SimpleCallback<IBaseTable.ITableRow<VOType>> actionCallback;

    @Override
    public Set<String> getConsumedEvents() {
        Set<String> consumedEvents = new HashSet<String>();

        consumedEvents.add(MouseOverEvent.getType().getName());
        consumedEvents.add(MouseOutEvent.getType().getName());
        consumedEvents.add(ClickEvent.getType().getName());

        return consumedEvents;
    }

    public ImageActionCell(ImageResource imageResource,
            SimpleCallback<IBaseTable.ITableRow<VOType>> actionCallback) {
        this.imageResource = imageResource;
        this.actionCallback = actionCallback;
    }

    @Override
    public void onBrowserEvent(Context context, Element parent, Void value, NativeEvent event,
            ValueUpdater<Void> valueUpdater) {
        if (event.getType().equals(MouseOverEvent.getType().getName())) {
            parent.getFirstChildElement().getStyle().setOpacity(GwtStyles.ENABLED_OPACITY);
        }

        if (event.getType().equals(MouseOutEvent.getType().getName())) {
            parent.getFirstChildElement().getStyle().setOpacity(GwtStyles.DISABLED_OPACITY);
        }

        if (event.getType().equals(ClickEvent.getType().getName())) {
            actionCallback.onCallback((IBaseTable.ITableRow<VOType>) context.getKey());
        }
    }

    @Override
    public void render(com.google.gwt.cell.client.Cell.Context context, Void value, SafeHtmlBuilder sb) {
        if (image == null) {
            image = new Image(imageResource);
            image.getElement().setTabIndex(-1);
            image.getElement().getStyle().setOpacity(GwtStyles.DISABLED_OPACITY);
        }

        sb.append(SafeHtmlUtils.fromTrustedString(image.getElement().getString()));
    }
}