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.ui.CmsStyles;
  14 import org.argeo.cms.ui.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
  26 /** A link to an internal or external location. */
  27 public class CmsLink implements CmsUiProvider {
  28         private final static Log log = LogFactory.getLog(CmsLink.class);
  29         private BundleContext bundleContext ;
  30
  31         private String label;
  32         private String custom;
  33         private String target;
  34         private String image;
  35         private MouseListener mouseListener;
  36
  37         private int verticalAlignment = SWT.CENTER;
  38
  39         // internal
  40         // private Boolean isUrl = false;
  41         private Integer imageWidth, imageHeight;
  42
  43         public CmsLink() {
  44                 super();
  45         }
  46
  47         public CmsLink(String label, String target) {
  48                 this(label, target, null);
  49         }
  50
  51         public CmsLink(String label, String target, String custom) {
  52                 super();
  53                 this.label = label;
  54                 this.target = target;
  55                 this.custom = custom;
  56                 init();
  57         }
  58
  59         public void init() {
  60                 if (image != null) {
  61                         ImageData image = loadImage();
  62                         imageWidth = image.width;
  63                         imageHeight = image.height;
  64                 }
  65         }
  66
  67         /** @return {@link Composite} with a single {@link Label} child. */
  68         @Override
  69         public Control createUi(final Composite parent, Node context) {
  70                 Composite comp = new Composite(parent, SWT.BOTTOM);
  71                 comp.setLayout(CmsUtils.noSpaceGridLayout());
  72
  73                 Label link = new Label(comp, SWT.NONE);
  74                 link.setData(RWT.MARKUP_ENABLED, Boolean.TRUE);
  75                 GridData layoutData = new GridData(SWT.CENTER, verticalAlignment, true,
  76                                 true);
  77                 if (image != null) {
  78                         layoutData.heightHint = imageHeight;
  79                         if (label == null)
  80                                 layoutData.widthHint = imageWidth;
  81                 }
  82
  83                 link.setLayoutData(layoutData);
  84                 if (custom != null) {
  85                         comp.setData(RWT.CUSTOM_VARIANT, custom);
  86                         link.setData(RWT.CUSTOM_VARIANT, custom);
  87                 } else {
  88                         comp.setData(RWT.CUSTOM_VARIANT, CmsStyles.CMS_LINK);
  89                         link.setData(RWT.CUSTOM_VARIANT, CmsStyles.CMS_LINK);
  90                 }
  91
  92                 // label
  93                 StringBuilder labelText = new StringBuilder();
  94                 if (target != null) {
  95                         labelText
  96                                         .append("<a style='color:inherit;text-decoration:inherit;' href=\"");
  97                         // if (!isUrl)
  98                         // labelText.append('#');
  99                         labelText.append(target);
 100                         labelText.append("\">");
 101                 }
 102                 if (image != null) {
 103                         registerImageIfNeeded();
 104                         String imageLocation = RWT.getResourceManager().getLocation(image);
 105                         labelText.append("<img width='").append(imageWidth)
 106                                         .append("' height='").append(imageHeight)
 107                                         .append("' src=\"").append(imageLocation).append("\"/>");
 108
 109                         // final Image img = loadImage(parent.getDisplay());
 110                         // link.setImage(img);
 111                         // link.addDisposeListener(new DListener(img));
 112                 }
 113
 114                 if (label != null) {
 115                         // link.setText(label);
 116                         labelText.append(' ').append(label);
 117                 }
 118
 119                 if (target != null)
 120                         labelText.append("</a>");
 121
 122                 link.setText(labelText.toString());
 123
 124                 // link.setCursor(link.getDisplay().getSystemCursor(SWT.CURSOR_HAND));
 125                 // CmsSession cmsSession = (CmsSession) parent.getDisplay().getData(
 126                 // CmsSession.KEY);
 127                 if (mouseListener != null)
 128                         link.addMouseListener(mouseListener);
 129
 130                 return comp;
 131         }
 132
 133         private void registerImageIfNeeded() {
 134                 ResourceManager resourceManager = RWT.getResourceManager();
 135                 if (!resourceManager.isRegistered(image)) {
 136                         URL res = getImageUrl();
 137                         InputStream inputStream = null;
 138                         try {
 139                                 IOUtils.closeQuietly(inputStream);
 140                                 inputStream = res.openStream();
 141                                 resourceManager.register(image, inputStream);
 142                                 if (log.isTraceEnabled())
 143                                         log.trace("Registered image " + image);
 144                         } catch (Exception e) {
 145                                 throw new CmsException("Cannot load image " + image, e);
 146                         } finally {
 147                                 IOUtils.closeQuietly(inputStream);
 148                         }
 149                 }
 150         }
 151
 152         private ImageData loadImage() {
 153                 URL url = getImageUrl();
 154                 ImageData result = null;
 155                 InputStream inputStream = null;
 156                 try {
 157                         inputStream = url.openStream();
 158                         result = new ImageData(inputStream);
 159                         if (log.isTraceEnabled())
 160                                 log.trace("Loaded image " + image);
 161                 } catch (Exception e) {
 162                         throw new CmsException("Cannot load image " + image, e);
 163                 } finally {
 164                         IOUtils.closeQuietly(inputStream);
 165                 }
 166                 return result;
 167         }
 168
 169         private URL getImageUrl() {
 170                 URL url;
 171                 try {
 172                         // pure URL
 173                         url = new URL(image);
 174                 } catch (MalformedURLException e1) {
 175                         url = bundleContext.getBundle().getResource(image);
 176                 }
 177
 178                 if (url == null)
 179                         throw new CmsException("No image " + image + " available.");
 180
 181                 return url;
 182         }
 183
 184         public void setBundleContext(BundleContext bundleContext) {
 185                 this.bundleContext = bundleContext;
 186         }
 187
 188         public void setLabel(String label) {
 189                 this.label = label;
 190         }
 191
 192         public void setCustom(String custom) {
 193                 this.custom = custom;
 194         }
 195
 196         public void setTarget(String target) {
 197                 this.target = target;
 198                 // try {
 199                 // new URL(target);
 200                 // isUrl = true;
 201                 // } catch (MalformedURLException e1) {
 202                 // isUrl = false;
 203                 // }
 204         }
 205
 206         public void setImage(String image) {
 207                 this.image = image;
 208         }
 209
 210         public void setMouseListener(MouseListener mouseListener) {
 211                 this.mouseListener = mouseListener;
 212         }
 213
 214         public void setvAlign(String vAlign) {
 215                 if ("bottom".equals(vAlign)) {
 216                         verticalAlignment = SWT.BOTTOM;
 217                 } else if ("top".equals(vAlign)) {
 218                         verticalAlignment = SWT.TOP;
 219                 } else if ("center".equals(vAlign)) {
 220                         verticalAlignment = SWT.CENTER;
 221                 } else {
 222                         throw new CmsException("Unsupported vertical allignment " + vAlign
 223                                         + " (must be: top, bottom or center)");
 224                 }
 225         }
 226 }