org.nightcode.gwt.selectio.client.ui.ItemCell.java Source code

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Here is the source code for org.nightcode.gwt.selectio.client.ui.ItemCell.java

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/*
 * 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.nightcode.gwt.selectio.client.ui;

import org.nightcode.gwt.selectio.shared.ItemProxy;

import com.google.gwt.cell.client.Cell;
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 java.util.Collections;
import java.util.Set;

/**
 *
 */
public class ItemCell implements Cell<ItemProxy> {

    interface Template extends SafeHtmlTemplates {
        @Template("<div class=\"slt-item-box\"><span class=\"slt-item-name\">{0}</span></div>")
        SafeHtml item(String value);

        @Template("<div class=\"slt-item-box\"><span class=\"slt-item-name\">{0}</span>"
                + "<span class=\"slt-item-description\">{1}</span></div>")
        SafeHtml itemAndDescription(String value, String description);
    }

    private static Template template;

    private Set<String> consumedEvents;

    public ItemCell() {
        if (template == null) {
            template = GWT.create(Template.class);
        }
        consumedEvents = Collections.unmodifiableSet(Collections.singleton("click"));
    }

    @Override
    public boolean dependsOnSelection() {
        return true;
    }

    @Override
    public Set<String> getConsumedEvents() {
        return consumedEvents;
    }

    @Override
    public boolean handlesSelection() {
        return true;
    }

    @Override
    public boolean isEditing(Context context, Element parent, ItemProxy value) {
        return false;
    }

    @Override
    public void onBrowserEvent(Context context, Element parent, ItemProxy value, NativeEvent event,
            ValueUpdater<ItemProxy> itemValueUpdater) {
        if (itemValueUpdater != null) {
            String type = event.getType();
            if ("click".equals(type)) {
                itemValueUpdater.update(value);
            }
        }
    }

    @Override
    public void render(Context context, ItemProxy value, SafeHtmlBuilder sb) {
        if (value == null || value.getDisplayName().length() == 0) {
            return;
        }
        sb.appendHtmlConstant("<div class=\"slt-item\"><i class=\"icon-ok\"></i>");
        if (value.getDescription() != null) {
            sb.append(template.itemAndDescription(value.getDisplayName(), value.getDescription()));
        } else {
            sb.append(template.item(value.getDisplayName()));
        }
        sb.appendHtmlConstant("</div>");
    }

    @Override
    public boolean resetFocus(Context context, Element parent, ItemProxy value) {
        return false;
    }

    @Override
    public void setValue(Context context, Element parent, ItemProxy value) {
        SafeHtmlBuilder sb = new SafeHtmlBuilder();
        render(context, value, sb);
        parent.setInnerHTML(sb.toSafeHtml().asString());
    }
}