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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* 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 com.vaadin.ui.renderers;
import com.vaadin.server.ExternalResource;
import com.vaadin.server.Resource;
import com.vaadin.server.ResourceReference;
import com.vaadin.server.ThemeResource;
import com.vaadin.shared.communication.URLReference;
import com.vaadin.shared.ui.grid.renderers.ImageRendererState;
import elemental.json.JsonValue;
/**
* A renderer for presenting images.
* <p>
* The image for each rendered cell is read from a Resource-typed property in
* the data source. Only {@link ExternalResource}s and {@link ThemeResource}s
* are currently supported.
*
* @param <T>
* the type of the grid this renderer can be attached to
*
* @since 7.4
* @author Vaadin Ltd
*/
public class ImageRenderer<T> extends ClickableRenderer<T, Resource> {
/**
* Creates a new image renderer.
*/
public ImageRenderer() {
super(Resource.class, null);
}
/**
* Creates a new image renderer and adds the given click listener to it.
*
* @param listener
* the click listener to register
*/
public ImageRenderer(RendererClickListener<T> listener) {
this();
addClickListener(listener);
}
@Override
public JsonValue encode(Resource resource) {
if (!(resource == null || resource instanceof ExternalResource
|| resource instanceof ThemeResource)) {
throw new IllegalArgumentException(
"ImageRenderer only supports ExternalResource and ThemeResource ("
+ resource.getClass().getSimpleName() + " given)");
}
return encode(ResourceReference.create(resource, this, null),
URLReference.class);
}
@Override
protected ImageRendererState getState() {
return (ImageRendererState) super.getState();
}
@Override
protected ImageRendererState getState(boolean markAsDirty) {
return (ImageRendererState) super.getState(markAsDirty);
}
}
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