org.opencms.acacia.client.widgets.complex.CmsDataViewPreviewWidget Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.acacia.client.widgets.complex;
import org.opencms.gwt.client.CmsCoreProvider;
import com.google.gwt.core.client.GWT;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;
/**
* Data view widget which fetches a preview image for the selected item from the server.
*/
public class CmsDataViewPreviewWidget extends Composite {
/**
* Loads image from data source.
*/
public static class ContentImageLoader implements I_ImageProvider {
/**
* @see org.opencms.acacia.client.widgets.complex.CmsDataViewPreviewWidget.I_ImageProvider#loadImage(java.lang.String, java.lang.String, com.google.gwt.user.client.rpc.AsyncCallback)
*/
public void loadImage(String config, String id, AsyncCallback callback) {
CmsCoreProvider.getVfsService().getDataViewThumbnail(config, id, callback);
}
}
/**
* Interface to load the thumbnail (potentially asynchronously).
*/
public static interface I_ImageProvider {
/**
* Loads the thumbnail.
*
* @param config the widget configuration
* @param id the data id
* @param callback the callback to call with the result (the image URL)
*/
void loadImage(String config, String id, AsyncCallback callback);
}
/**
* Loads image from a fixed URL.
*/
public static class SimpleImageLoader implements I_ImageProvider {
/** The thumbnail url. */
private String m_url;
/**
* Creates a new URL.
*
* @param url the URL of the image to load
*/
public SimpleImageLoader(String url) {
m_url = url;
}
/**
* @see org.opencms.acacia.client.widgets.complex.CmsDataViewPreviewWidget.I_ImageProvider#loadImage(java.lang.String, java.lang.String, com.google.gwt.user.client.rpc.AsyncCallback)
*/
public void loadImage(String config, String id, AsyncCallback callback) {
callback.onSuccess(m_url);
}
}
/** The ui-binder interface for this widget. */
interface I_CmsPreviewUiBinder extends UiBinder {
// GWT interface, nothing to do here
}
/** The widget configuration. */
private String m_config;
/** The object used to access the editor value. */
private CmsDataViewValueAccessor m_accessor;
/** The container for the image. */
@UiField
protected FlowPanel m_imageContainer;
/** The preview image. */
@UiField
protected Image m_image;
/** The label to the right of the preview image. */
@UiField
protected Label m_label;
/** The label with the description text. */
@UiField
protected HTML m_descriptionLabel;
/** The image provider. */
private I_ImageProvider m_imageProvider;
/**
* Creates a new instance.
*
* @param config the widget configuration
* @param accessor the accessor for the editor values
* @param provider the image provider
*/
public CmsDataViewPreviewWidget(String config, CmsDataViewValueAccessor accessor, I_ImageProvider provider) {
I_CmsPreviewUiBinder binder = GWT.create(I_CmsPreviewUiBinder.class);
initWidget(binder.createAndBindUi(this));
m_config = config;
m_accessor = accessor;
m_label.setText(m_accessor.getValue().getTitle());
m_imageProvider = provider;
if (provider == null) {
m_imageContainer.setVisible(false);
}
m_descriptionLabel.setHTML(m_accessor.getValue().getDescription());
}
/**
* @see com.google.gwt.user.client.ui.Widget#onLoad()
*/
@Override
protected void onLoad() {
super.onLoad();
if (m_imageProvider != null) {
m_imageProvider.loadImage(m_config, m_accessor.getValue().getId(), new AsyncCallback() {
public void onFailure(Throwable caught) {
// do nothing
}
public void onSuccess(String imageUrl) {
if (imageUrl == null) {
imageUrl = "";
}
m_image.setUrl(imageUrl);
}
});
}
}
}