org.guvnor.messageconsole.client.console.HyperLinkCell.java Source code

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Here is the source code for org.guvnor.messageconsole.client.console.HyperLinkCell.java

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/*
 * Copyright 2014 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.guvnor.messageconsole.client.console;

import com.google.gwt.cell.client.AbstractCell;
import com.google.gwt.cell.client.ValueUpdater;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.text.shared.SafeHtmlRenderer;
import org.uberfire.commons.validation.PortablePreconditions;

import static com.google.gwt.dom.client.BrowserEvents.*;

public class HyperLinkCell extends AbstractCell<HyperLinkCell.HyperLink> {

    interface HyperLinkTemplate extends SafeHtmlTemplates {

        @Template("<a title=\"{1}\" href=\"#\">{0}</a>")
        SafeHtml hyperLink(final SafeHtml label, final String title);
    }

    interface TextTemplate extends SafeHtmlTemplates {

        @Template("<span title=\"{1}\">{0}</span>")
        SafeHtml text(final String label, final String title);
    }

    /**
     * Inner class to contain the Hyper Link details
     */
    public static class HyperLink {

        private String label;
        private boolean isLink;

        public static HyperLink newLink(final String label) {
            return new HyperLink(label, true);
        }

        public static HyperLink newText(final String label) {
            return new HyperLink(label, false);
        }

        private HyperLink(final String label, final boolean isLink) {
            this.label = PortablePreconditions.checkNotNull("label", label);
            this.isLink = PortablePreconditions.checkNotNull("isLink", isLink);
        }

        public String getLabel() {
            return label;
        }

        public boolean isLink() {
            return isLink;
        }

    }

    private static HyperLinkTemplate hyperLinkTemplate = GWT.create(HyperLinkTemplate.class);
    private static TextTemplate textTemplate = GWT.create(TextTemplate.class);

    /**
     * Construct a new HyperLinkCell that will use a given
     * {@link SafeHtmlRenderer}.
     */
    public HyperLinkCell() {
        super(CLICK, KEYDOWN);
    }

    @Override
    public void onBrowserEvent(final Context context, final Element parent, final HyperLink value,
            final NativeEvent event, final ValueUpdater<HyperLink> valueUpdater) {
        super.onBrowserEvent(context, parent, value, event, valueUpdater);
        if (CLICK.equals(event.getType())) {
            onEnterKeyDown(context, parent, value, event, valueUpdater);
        }
    }

    @Override
    protected void onEnterKeyDown(final Context context, final Element parent, final HyperLink value,
            final NativeEvent event, final ValueUpdater<HyperLink> valueUpdater) {
        final Element element = event.getEventTarget().cast();
        if (!parent.getFirstChildElement().equals(element)) {
            return;
        }
        event.preventDefault();
        event.stopPropagation();
        if (valueUpdater != null) {
            valueUpdater.update(value);
        }
    }

    @Override
    public void render(final Context context, final HyperLink value, final SafeHtmlBuilder sb) {
        if (value != null) {
            if (value.isLink()) {
                sb.append(
                        hyperLinkTemplate.hyperLink(SafeHtmlUtils.fromString(value.getLabel()), value.getLabel()));
            } else {
                sb.append(textTemplate.text(value.getLabel(), value.getLabel()));
            }
        }
    }

}