Java tutorial
/* Copyright (C) 2016 maik.jablonski@jease.org This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ package jfix.zk; import java.awt.Dimension; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.nio.file.Files; import java.nio.file.StandardCopyOption; import jfix.util.I18N; import jfix.util.MimeTypes; import org.apache.commons.io.FileUtils; import org.apache.commons.io.FilenameUtils; import org.zkoss.codemirror.Codemirror; import org.zkoss.image.AImage; import org.zkoss.util.media.AMedia; import org.zkoss.util.media.Media; import org.zkoss.zk.ui.event.Event; import org.zkoss.zk.ui.event.EventListener; import org.zkoss.zk.ui.event.Events; import org.zkoss.zk.ui.event.UploadEvent; import org.zkoss.zul.Button; import org.zkoss.zul.Checkbox; import org.zkoss.zul.Image; import org.zkoss.zul.Vbox; public class Mediafield extends Vbox { private boolean preview; private Media media = null; private Codemirror codemirror = new Codemirror(); private Image image = new Image(); private Button rotateImage = new Button(I18N.get("Rotate"), Images.EditRedo); private Spinner width = new Spinner(); private Spinner height = new Spinner(); private Checkbox aspectRatioLock = new Checkbox(); private Column imagePreview = new Column(image, new Row(width, aspectRatioLock, height, rotateImage)); private Fileupload upload = new Fileupload(); private Button download = new Button(); private Dimension originalDimension = null; public Mediafield() { setHflex("1"); upload.addEventListener(Events.ON_UPLOAD, $event -> uploadPerformed(((UploadEvent) $event).getMedia())); download.addEventListener(Events.ON_CLICK, $event -> downloadPerformed()); rotateImage.addEventListener(Events.ON_CLICK, $event -> { try { File imageFile = Medias.asFile(media); imageFile.deleteOnExit(); File rotatedImage = jfix.util.Images.rotate(imageFile); rotatedImage.deleteOnExit(); setMedia(media.getName(), media.getContentType(), rotatedImage); } catch (IOException e) { Modal.exception(e); } }); aspectRatioLock.setChecked(true); EventListener<Event> dimensionChanged = $event -> { Dimension scaledDimension = null; if (aspectRatioLock.isChecked()) { scaledDimension = jfix.util.Images.scaleDimension(originalDimension, new Dimension(width.intValue(), height.intValue())); width.setValue((int) scaledDimension.getWidth()); height.setValue((int) scaledDimension.getHeight()); } else { scaledDimension = new Dimension(width.intValue(), height.intValue()); } File imageFile = Medias.asFile(media); imageFile.deleteOnExit(); File scaledImage = jfix.util.Images.scale(imageFile, scaledDimension); scaledImage.deleteOnExit(); setMedia(media.getName(), media.getContentType(), scaledImage); }; width.addEventListener(Events.ON_CHANGE, dimensionChanged); height.addEventListener(Events.ON_CHANGE, dimensionChanged); setHeight("300px"); setPreview(true); codemirror.setVisible(false); imagePreview.setVisible(false); width.setStep(10); height.setStep(10); download.setImage(Images.DriveRemovableMedia); download.setVisible(false); appendChild(codemirror); appendChild(imagePreview); appendChild(new Row(download, upload)); } public void setHeight(String height) { codemirror.setHeight(height); image.setHeight(height); } private void uploadPerformed(Media uploadedMedia) { if (uploadedMedia != null) { this.media = uploadedMedia; Events.sendEvent(new Event(Events.ON_UPLOAD, this)); updateMediaViewer(); } } private void downloadPerformed() { Filedownload.save(media); } public Media getMedia() { return media; } public void setMedia(String name, String contentType, File file) { try { if (file != null && file.exists()) { setMedia(new AMedia(name, null, contentType, file, true)); } else { setMedia(null); } } catch (IOException e) { throw new RuntimeException(e.getMessage(), e); } } public void setMedia(Media media) { this.media = media; updateMediaViewer(); } private void updateMediaViewer() { try { download.setVisible(media != null); imagePreview.setVisible(false); codemirror.setVisible(false); download.setLabel(I18N.get("Download") + " (" + getContentType() + ")"); if (isPreview()) { if (getContentType() != null) { if (getContentType().startsWith("image")) { InputStream input = Medias.asStream(media); imagePreview.setVisible(true); image.setContent(new AImage(getName(), input)); input.close(); adjustImage(); } if (isContentTypeEditable()) { String mediaString = Medias.asString(media); if (mediaString.length() < 1024 * 1024) { codemirror.setVisible(true); codemirror.setValue(Medias.asString(media)); codemirror.setSyntax(FilenameUtils.getExtension(media.getName())); } } } } } catch (IOException e) { throw new RuntimeException(e.getMessage(), e); } } public boolean isEmpty() { return media == null; } public void copyToFile(File target) { if (target == null) { return; } try { if (codemirror.isVisible()) { FileUtils.writeStringToFile(target, codemirror.getValue(), "UTF-8"); codemirror.setSyntax(FilenameUtils.getExtension(target.getName())); } else { if (media != null) { Files.move(Medias.asFile(media).toPath(), target.toPath(), StandardCopyOption.REPLACE_EXISTING); } } } catch (IOException e) { throw new RuntimeException(e.getMessage(), e); } } public String getContentType() { if (media == null) { return null; } if (media.getContentType() == null || media.getContentType().equals("application/octet-stream")) { return MimeTypes.guessContentTypeFromName(media.getName()); } else { return media.getContentType(); } } private boolean isContentTypeEditable() { String ctype = getContentType(); return ctype != null && (ctype.startsWith("text") || ctype.equals("application/javascript")); } public String getName() { return media != null ? media.getName() : null; } public void setPreview(boolean preview) { this.preview = preview; } public boolean isPreview() { return preview; } private void adjustImage() { try { int textHeight = Integer.parseInt(codemirror.getHeight().replace("px", "")); File imageFile = Medias.asFile(media); imageFile.deleteOnExit(); originalDimension = jfix.util.Images.getSize(imageFile); width.setValue((int) originalDimension.getWidth()); height.setValue((int) originalDimension.getHeight()); int imageHeight = (int) originalDimension.getHeight(); int minHeight = Math.min(imageHeight, textHeight); image.setHeight(minHeight + "px"); } catch (Throwable e) { // pass } } public void setUploadLimit(String limit) { upload.setUploadLimit(limit); } }