cms/util/CmsLink.java

   1 package org.argeo.cms.util;
   2
   3 import java.io.InputStream;
   4 import java.net.MalformedURLException;
   5 import java.net.URL;
   6
   7 import javax.jcr.Node;
   8
   9 import org.apache.commons.io.IOUtils;
  10 import org.apache.commons.logging.Log;
  11 import org.apache.commons.logging.LogFactory;
  12 import org.argeo.cms.CmsException;
  13 import org.argeo.cms.CmsStyles;
  14 import org.argeo.cms.CmsUiProvider;
  15 import org.eclipse.rap.rwt.RWT;
  16 import org.eclipse.rap.rwt.service.ResourceManager;
  17 import org.eclipse.swt.SWT;
  18 import org.eclipse.swt.events.MouseListener;
  19 import org.eclipse.swt.graphics.ImageData;
  20 import org.eclipse.swt.layout.GridData;
  21 import org.eclipse.swt.widgets.Composite;
  22 import org.eclipse.swt.widgets.Control;
  23 import org.eclipse.swt.widgets.Label;
  24 import org.osgi.framework.BundleContext;
  25 import org.osgi.framework.FrameworkUtil;
  26
  27 /** A link to an internal or external location. */
  28 public class CmsLink implements CmsUiProvider {
  29         private final static Log log = LogFactory.getLog(CmsLink.class);
  30         private BundleContext bc = FrameworkUtil.getBundle(getClass())
  31                         .getBundleContext();
  32
  33         private String label;
  34         private String custom;
  35         private String target;
  36         private String image;
  37         private MouseListener mouseListener;
  38
  39         private int verticalAlignment = SWT.CENTER;
  40
  41         // internal
  42         // private Boolean isUrl = false;
  43         private Integer imageWidth, imageHeight;
  44
  45         public CmsLink() {
  46                 super();
  47         }
  48
  49         public CmsLink(String label, String target) {
  50                 this(label, target, null);
  51         }
  52
  53         public CmsLink(String label, String target, String custom) {
  54                 super();
  55                 this.label = label;
  56                 this.target = target;
  57                 this.custom = custom;
  58                 init();
  59         }
  60
  61         public void init() {
  62                 if (image != null) {
  63                         ImageData image = loadImage();
  64                         imageWidth = image.width;
  65                         imageHeight = image.height;
  66                 }
  67         }
  68
  69         /** @return {@link Composite} with a single {@link Label} child. */
  70         @Override
  71         public Control createUi(final Composite parent, Node context) {
  72                 Composite comp = new Composite(parent, SWT.BOTTOM);
  73                 comp.setLayout(CmsUtils.noSpaceGridLayout());
  74
  75                 Label link = new Label(comp, SWT.NONE);
  76                 link.setData(RWT.MARKUP_ENABLED, Boolean.TRUE);
  77                 GridData layoutData = new GridData(SWT.CENTER, verticalAlignment, true,
  78                                 true);
  79                 if (image != null) {
  80                         layoutData.heightHint = imageHeight;
  81                         if (label == null)
  82                                 layoutData.widthHint = imageWidth;
  83                 }
  84
  85                 link.setLayoutData(layoutData);
  86                 if (custom != null) {
  87                         comp.setData(RWT.CUSTOM_VARIANT, custom);
  88                         link.setData(RWT.CUSTOM_VARIANT, custom);
  89                 } else {
  90                         comp.setData(RWT.CUSTOM_VARIANT, CmsStyles.CMS_LINK);
  91                         link.setData(RWT.CUSTOM_VARIANT, CmsStyles.CMS_LINK);
  92                 }
  93
  94                 // label
  95                 StringBuilder labelText = new StringBuilder();
  96                 if (target != null) {
  97                         labelText
  98                                         .append("<a style='color:inherit;text-decoration:inherit;' href=\"");
  99                         // if (!isUrl)
 100                         // labelText.append('#');
 101                         labelText.append(target);
 102                         labelText.append("\">");
 103                 }
 104                 if (image != null) {
 105                         registerImageIfNeeded();
 106                         String imageLocation = RWT.getResourceManager().getLocation(image);
 107                         labelText.append("<img width='").append(imageWidth)
 108                                         .append("' height='").append(imageHeight)
 109                                         .append("' src=\"").append(imageLocation).append("\"/>");
 110
 111                         // final Image img = loadImage(parent.getDisplay());
 112                         // link.setImage(img);
 113                         // link.addDisposeListener(new DListener(img));
 114                 }
 115
 116                 if (label != null) {
 117                         // link.setText(label);
 118                         labelText.append(' ').append(label);
 119                 }
 120
 121                 if (target != null)
 122                         labelText.append("</a>");
 123
 124                 link.setText(labelText.toString());
 125
 126                 // link.setCursor(link.getDisplay().getSystemCursor(SWT.CURSOR_HAND));
 127                 // CmsSession cmsSession = (CmsSession) parent.getDisplay().getData(
 128                 // CmsSession.KEY);
 129                 if (mouseListener != null)
 130                         link.addMouseListener(mouseListener);
 131
 132                 return comp;
 133         }
 134
 135         private void registerImageIfNeeded() {
 136                 ResourceManager resourceManager = RWT.getResourceManager();
 137                 if (!resourceManager.isRegistered(image)) {
 138                         URL res = getImageUrl();
 139                         InputStream inputStream = null;
 140                         try {
 141                                 IOUtils.closeQuietly(inputStream);
 142                                 inputStream = res.openStream();
 143                                 resourceManager.register(image, inputStream);
 144                                 if (log.isTraceEnabled())
 145                                         log.trace("Registered image " + image);
 146                         } catch (Exception e) {
 147                                 throw new CmsException("Cannot load image " + image, e);
 148                         } finally {
 149                                 IOUtils.closeQuietly(inputStream);
 150                         }
 151                 }
 152         }
 153
 154         private ImageData loadImage() {
 155                 URL url = getImageUrl();
 156                 ImageData result = null;
 157                 InputStream inputStream = null;
 158                 try {
 159                         inputStream = url.openStream();
 160                         result = new ImageData(inputStream);
 161                         if (log.isTraceEnabled())
 162                                 log.trace("Loaded image " + image);
 163                 } catch (Exception e) {
 164                         throw new CmsException("Cannot load image " + image, e);
 165                 } finally {
 166                         IOUtils.closeQuietly(inputStream);
 167                 }
 168                 return result;
 169         }
 170
 171         private URL getImageUrl() {
 172                 URL url;
 173                 try {
 174                         // pure URL
 175                         url = new URL(image);
 176                 } catch (MalformedURLException e1) {
 177                         url = bc.getBundle().getResource(image);
 178                 }
 179
 180                 if (url == null)
 181                         throw new CmsException("No image " + image + " available.");
 182
 183                 return url;
 184         }
 185
 186         public void setLabel(String label) {
 187                 this.label = label;
 188         }
 189
 190         public void setCustom(String custom) {
 191                 this.custom = custom;
 192         }
 193
 194         public void setTarget(String target) {
 195                 this.target = target;
 196                 // try {
 197                 // new URL(target);
 198                 // isUrl = true;
 199                 // } catch (MalformedURLException e1) {
 200                 // isUrl = false;
 201                 // }
 202         }
 203
 204         public void setImage(String image) {
 205                 this.image = image;
 206         }
 207
 208         public void setMouseListener(MouseListener mouseListener) {
 209                 this.mouseListener = mouseListener;
 210         }
 211
 212         public void setvAlign(String vAlign) {
 213                 if ("bottom".equals(vAlign)) {
 214                         verticalAlignment = SWT.BOTTOM;
 215                 } else if ("top".equals(vAlign)) {
 216                         verticalAlignment = SWT.TOP;
 217                 } else if ("center".equals(vAlign)) {
 218                         verticalAlignment = SWT.CENTER;
 219                 } else {
 220                         throw new CmsException("Unsupported vertical allignment " + vAlign
 221                                         + " (must be: top, bottom or center)");
 222                 }
 223         }
 224 }