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org.primefaces.component.imagecropper.ImageCropperRenderer Maven / Gradle / Ivy
/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.component.imagecropper;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import javax.el.ValueExpression;
import javax.faces.application.Application;
import javax.faces.application.Resource;
import javax.faces.application.ResourceHandler;
import javax.faces.component.UIComponent;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.convert.ConverterException;
import javax.imageio.ImageIO;
import org.primefaces.model.CroppedImage;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.WidgetBuilder;
public class ImageCropperRenderer extends CoreRenderer {
@Override
public void decode(FacesContext context, UIComponent component) {
ImageCropper cropper = (ImageCropper) component;
Map params = context.getExternalContext().getRequestParameterMap();
String coordsParam = cropper.getClientId(context) + "_coords";
if(params.containsKey(coordsParam)) {
cropper.setSubmittedValue(params.get(coordsParam));
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
ImageCropper cropper = (ImageCropper) component;
encodeMarkup(context, cropper);
encodeScript(context, cropper);
}
protected void encodeScript(FacesContext context, ImageCropper cropper) throws IOException{
String widgetVar = cropper.resolveWidgetVar();
String clientId = cropper.getClientId(context);
String image = clientId + "_image";
String select = null;
WidgetBuilder wb = getWidgetBuilder(context);
wb.initWithComponentLoad("ImageCropper", widgetVar, clientId, clientId + "_image")
.attr("image", image);
if(cropper.getMinSize() != null)
wb.append(",minSize:[").append(cropper.getMinSize()).append("]");
if(cropper.getMaxSize() != null)
wb.append(",maxSize:[").append(cropper.getMaxSize()).append("]");
wb.attr("bgColor", cropper.getBackgroundColor(), null)
.attr("bgOpacity", cropper.getBackgroundOpacity(), 0.6)
.attr("aspectRatio", cropper.getAspectRatio(), Double.MIN_VALUE)
.attr("boxWidth", cropper.getBoxWidth(), 0)
.attr("boxHeight", cropper.getBoxHeight(), 0);
Object value = cropper.getValue();
if(value != null) {
CroppedImage croppedImage = (CroppedImage) value;
int x = croppedImage.getLeft();
int y = croppedImage.getTop();
int x2 = x + croppedImage.getWidth();
int y2 = y + croppedImage.getHeight();
select = "[" + x + "," + y + "," + x2 + "," + y2 + "]";
}
else if(cropper.getInitialCoords() != null) {
select = "[" + cropper.getInitialCoords() + "]";
}
wb.append(",setSelect:").append(select);
wb.finish();
}
protected void encodeMarkup(FacesContext context, ImageCropper cropper) throws IOException{
ResponseWriter writer = context.getResponseWriter();
String clientId = cropper.getClientId(context);
String coordsHolderId = clientId + "_coords";
writer.startElement("div", cropper);
writer.writeAttribute("id", clientId, null);
renderImage(context, cropper, clientId);
writer.startElement("input", null);
writer.writeAttribute("type", "hidden", null);
writer.writeAttribute("id", coordsHolderId, null);
writer.writeAttribute("name", coordsHolderId, null);
writer.endElement("input");
writer.endElement("div");
}
private void renderImage(FacesContext context, ImageCropper cropper, String clientId) throws IOException{
ResponseWriter writer = context.getResponseWriter();
String alt = cropper.getAlt() == null ? "" : cropper.getAlt();
writer.startElement("img", null);
writer.writeAttribute("id", clientId + "_image", null);
writer.writeAttribute("alt", alt, null);
writer.writeAttribute("src", getResourceURL(context, cropper.getImage()), null);
writer.endElement("img");
}
@Override
public Object getConvertedValue(FacesContext context, UIComponent component, Object submittedValue) throws ConverterException {
String coords = (String) submittedValue;
if(isValueBlank(coords)) {
return null;
}
String[] cropCoords = coords.split("_");
int x = (int) Double.parseDouble(cropCoords[0]);
int y = (int) Double.parseDouble(cropCoords[1]);
int w = (int) Double.parseDouble(cropCoords[2]);
int h = (int) Double.parseDouble(cropCoords[3]);
if (w <= 0 || h <= 0) {
return null;
}
ImageCropper cropper = (ImageCropper) component;
Resource resource = getImageResource(context, cropper);
InputStream inputStream;
String imagePath = cropper.getImage();
String contentType = null;
try {
if (resource != null && !"RES_NOT_FOUND".equals(resource.toString())) {
inputStream = resource.getInputStream();
contentType = resource.getContentType();
}
else {
boolean isExternal = imagePath.startsWith("http");
if (isExternal) {
URL url = new URL(imagePath);
URLConnection urlConnection = url.openConnection();
inputStream = urlConnection.getInputStream();
contentType = urlConnection.getContentType();
}
else {
ExternalContext externalContext = context.getExternalContext();
File file = new File(externalContext.getRealPath("") + imagePath);
inputStream = new FileInputStream(file);
}
}
BufferedImage outputImage = ImageIO.read(inputStream);
inputStream.close();
BufferedImage cropped = outputImage.getSubimage(x, y, w, h);
ByteArrayOutputStream croppedOutImage = new ByteArrayOutputStream();
String format = guessImageFormat(contentType, imagePath);
ImageIO.write(cropped, format, croppedOutImage);
return new CroppedImage(cropper.getImage(), croppedOutImage.toByteArray(), x, y, w, h);
}
catch (IOException e) {
throw new ConverterException(e);
}
}
/**
* Attempt to obtain the resource from the server by parsing the valueExpression of the image attribute. Returns null
* if the valueExpression is not of the form #{resource['path/to/resource']} or #{resource['library:name']}. Otherwise
* returns the value obtained by ResourceHandler.createResource().
*/
private Resource getImageResource(FacesContext facesContext, ImageCropper imageCropper) {
Resource resource = null;
ValueExpression imageValueExpression = imageCropper.getValueExpression(ImageCropper.PropertyKeys.image.toString());
if (imageValueExpression != null) {
String imageValueExpressionString = imageValueExpression.getExpressionString();
if (imageValueExpressionString.matches("^[#][{]resource\\['[^']+'\\][}]$")) {
imageValueExpressionString = imageValueExpressionString.replaceFirst("^[#][{]resource\\['", "");
imageValueExpressionString = imageValueExpressionString.replaceFirst("'\\][}]$", "");
String resourceLibrary = null;
String resourceName;
String[] resourceInfo = imageValueExpressionString.split(":");
if (resourceInfo.length == 2) {
resourceLibrary = resourceInfo[0];
resourceName = resourceInfo[1];
}
else {
resourceName = resourceInfo[0];
}
if (resourceName != null) {
Application application = facesContext.getApplication();
ResourceHandler resourceHandler = application.getResourceHandler();
if (resourceLibrary != null) {
resource = resourceHandler.createResource(resourceName, resourceLibrary);
}
else {
resource = resourceHandler.createResource(resourceName);
}
}
}
}
return resource;
}
/**
* Attempt to obtain the image format used to write the image from the contentType or the image's file extension.
*/
private String guessImageFormat(String contentType, String imagePath) throws IOException {
String format = "png";
if (contentType == null) {
contentType = URLConnection.guessContentTypeFromName(imagePath);
}
if (contentType != null) {
format = contentType.replaceFirst("^image/([^;]+)[;]?.*$", "$1");
}
else {
int queryStringIndex = imagePath.indexOf('?');
if (queryStringIndex != -1 ) {
imagePath = imagePath.substring(0, queryStringIndex);
}
String[] pathTokens = imagePath.split("\\.");
if (pathTokens.length > 1) {
format = pathTokens[pathTokens.length - 1];
}
}
return format;
}
}
