/*
* Copyright (c) 2011 PonySDK
* Owners:
* Luciano Broussal <luciano.broussal AT gmail.com>
* Mathieu Barbier <mathieu.barbier AT gmail.com>
* Nicolas Ciaravola <nicolas.ciaravola.pro AT gmail.com>
*
* WebSite:
* http://code.google.com/p/pony-sdk/
*
* 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.ponysdk.ui.server.basic;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ponysdk.core.StreamResource;
import com.ponysdk.core.event.StreamHandler;
import com.ponysdk.core.instruction.Update;
import com.ponysdk.core.stm.Txn;
import com.ponysdk.ui.terminal.Dictionnary.PROPERTY;
import com.ponysdk.ui.terminal.WidgetType;
/**
* A widget that displays the image at a given URL. The image can be in 'unclipped' mode (the default) or
* 'clipped' mode. In clipped mode, a viewport is overlaid on top of the image so that a subset of the image
* will be displayed. In unclipped mode, there is no viewport - the entire image will be visible. Whether an
* image is in clipped or unclipped mode depends on how the image is constructed, and how it is transformed
* after construction. Methods will operate differently depending on the mode that the image is in. These
* differences are detailed in the documentation for each method.
* <p>
* If an image transitions between clipped mode and unclipped mode, any {@link PElement}-specific attributes
* added by the user (including style attributes, style names, and style modifiers), except for event
* listeners, will be lost.
* </p>
* <h3>CSS Style Rules</h3>
* <dl>
* <dt>.gwt-Image</dt> </dd>The outer element</dd>
* </dl>
* Transformations between clipped and unclipped state will result in a loss of any style names that were
* set/added; the only style names that are preserved are those that are mentioned in the static CSS style
* rules. Due to browser-specific HTML constructions needed to achieve the clipping effect, certain CSS
* attributes, such as padding and background, may not work as expected when an image is in clipped mode.
* These limitations can usually be easily worked around by encapsulating the image in a container widget that
* can itself be styled.
*/
public class PImage extends PFocusWidget {
private static Logger log = LoggerFactory.getLogger(PImage.class);
private String url;
private int left;
private int top;
public PImage() {}
public PImage(final String url, final int left, final int top, final int width, final int height) {
create.put(PROPERTY.WIDGET_HEIGHT, width);
create.put(PROPERTY.WIDGET_WIDTH, height);
create.put(PROPERTY.IMAGE_URL, url);
create.put(PROPERTY.IMAGE_LEFT, left);
create.put(PROPERTY.IMAGE_TOP, top);
}
public PImage(final String url) {
setUrl(url);
}
public PImage(final ClassPathURL classpathURL) {
InputStream in = null;
ByteArrayOutputStream out = null;
String imageToBase64 = null;
try {
in = classpathURL.getUrl().openStream();
final byte[] buffer = new byte[1024];
out = new ByteArrayOutputStream();
while (in.read(buffer) != -1) {
out.write(buffer);
}
imageToBase64 = new String(out.toByteArray(), "UTF-8");
} catch (final IOException e) {
log.error("Cannot load resource from " + classpathURL, e);
} finally {
try {
in.close();
} catch (final Exception e) {}
try {
out.close();
} catch (final Exception e) {}
}
final String extension = classpathURL.getUrl().getFile().substring(classpathURL.getUrl().getFile().lastIndexOf('.') + 1);
final Update update = new Update(getID());
update.put(PROPERTY.IMAGE_URL, "data:image/" + extension + ";base64," + imageToBase64);
Txn.get().getTxnContext().save(update);
}
@Override
protected WidgetType getWidgetType() {
return WidgetType.IMAGE;
}
public String getUrl() {
return url;
}
public void setUrl(final String url) {
this.url = url;
final Update update = new Update(getID());
update.put(PROPERTY.IMAGE_URL, url);
Txn.get().getTxnContext().save(update);
}
public void setStream(final StreamHandler streamListener) {
final StreamResource streamResource = new StreamResource();
streamResource.embed(streamListener, this);
}
public static class ClassPathURL {
private final URL url;
public ClassPathURL(final String resourcePath) {
url = getClass().getClassLoader().getResource(resourcePath);
}
public URL getUrl() {
return url;
}
@Override
public String toString() {
return "ClassPathURL [url=" + url + "]";
}
}
public int getLeft() {
return left;
}
public int getTop() {
return top;
}
}