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                 if (image != null && (imageWidth == null || imageHeight == null)) {
  71                         throw new CmsException("Image is not properly configured."
  72                                         + " Make sure bundleContext property is set and init() method has been called.");
  73                 }
  74
  75                 Composite comp = new Composite(parent, SWT.BOTTOM);
  76                 comp.setLayout(CmsUtils.noSpaceGridLayout());
  77
  78                 Label link = new Label(comp, SWT.NONE);
  79                 link.setData(RWT.MARKUP_ENABLED, Boolean.TRUE);
  80                 GridData layoutData = new GridData(SWT.CENTER, verticalAlignment, true, true);
  81                 if (image != null) {
  82                         layoutData.heightHint = imageHeight;
  83                         if (label == null)
  84                                 layoutData.widthHint = imageWidth;
  85                 }
  86
  87                 link.setLayoutData(layoutData);
  88                 if (custom != null) {
  89                         comp.setData(RWT.CUSTOM_VARIANT, custom);
  90                         link.setData(RWT.CUSTOM_VARIANT, custom);
  91                 } else {
  92                         comp.setData(RWT.CUSTOM_VARIANT, CmsStyles.CMS_LINK);
  93                         link.setData(RWT.CUSTOM_VARIANT, CmsStyles.CMS_LINK);
  94                 }
  95
  96                 // label
  97                 StringBuilder labelText = new StringBuilder();
  98                 if (target != null) {
  99                         labelText.append("<a style='color:inherit;text-decoration:inherit;' href=\"");
 100                         // if (!isUrl)
 101                         // labelText.append('#');
 102                         labelText.append(target);
 103                         labelText.append("\">");
 104                 }
 105                 if (image != null) {
 106                         registerImageIfNeeded();
 107                         String imageLocation = RWT.getResourceManager().getLocation(image);
 108                         labelText.append("<img width='").append(imageWidth).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 = bundleContext.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 setBundleContext(BundleContext bundleContext) {
 187                 this.bundleContext = bundleContext;
 188         }
 189
 190         public void setLabel(String label) {
 191                 this.label = label;
 192         }
 193
 194         public void setCustom(String custom) {
 195                 this.custom = custom;
 196         }
 197
 198         public void setTarget(String target) {
 199                 this.target = target;
 200                 // try {
 201                 // new URL(target);
 202                 // isUrl = true;
 203                 // } catch (MalformedURLException e1) {
 204                 // isUrl = false;
 205                 // }
 206         }
 207
 208         public void setImage(String image) {
 209                 this.image = image;
 210         }
 211
 212         public void setMouseListener(MouseListener mouseListener) {
 213                 this.mouseListener = mouseListener;
 214         }
 215
 216         public void setvAlign(String vAlign) {
 217                 if ("bottom".equals(vAlign)) {
 218                         verticalAlignment = SWT.BOTTOM;
 219                 } else if ("top".equals(vAlign)) {
 220                         verticalAlignment = SWT.TOP;
 221                 } else if ("center".equals(vAlign)) {
 222                         verticalAlignment = SWT.CENTER;
 223                 } else {
 224                         throw new CmsException("Unsupported vertical allignment " + vAlign + " (must be: top, bottom or center)");
 225                 }
 226         }
 227 }