swt/org.argeo.cms.swt/src/org/argeo/cms/swt/AbstractSwtImageManager.java

   1 package org.argeo.cms.swt;
   2
   3 import java.net.URI;
   4 import java.net.URLEncoder;
   5 import java.nio.charset.StandardCharsets;
   6
   7 import org.argeo.api.cms.ux.Cms2DSize;
   8 import org.argeo.cms.ux.AbstractImageManager;
   9 import org.eclipse.swt.graphics.ImageData;
  10 import org.eclipse.swt.widgets.Control;
  11 import org.eclipse.swt.widgets.Label;
  12
  13 /** Manages only public images so far. */
  14 public abstract class AbstractSwtImageManager<M> extends AbstractImageManager<Control, M> {
  15         protected abstract ImageData getSwtImageData(M node);
  16
  17         protected abstract String noImg(Cms2DSize size);
  18
  19         @Override
  20         public Boolean load(M node, Control control, Cms2DSize preferredSize, URI link) {
  21                 Cms2DSize imageSize = getImageSize(node);
  22                 Cms2DSize size;
  23                 String imgTag = null;
  24                 if (preferredSize == null || imageSize.width() == 0 || imageSize.height() == 0
  25                                 || (preferredSize.width() == 0 && preferredSize.height() == 0)) {
  26                         if (imageSize.width() != 0 && imageSize.height() != 0) {
  27                                 // actual image size if completely known
  28                                 size = imageSize;
  29                         } else {
  30                                 // no image if not completely known
  31                                 size = resizeTo(NO_IMAGE_SIZE, preferredSize != null ? preferredSize : imageSize);
  32                                 imgTag = noImg(size);
  33                         }
  34
  35                 } else if (preferredSize.width() != 0 && preferredSize.height() != 0) {
  36                         // given size if completely provided
  37                         size = preferredSize;
  38                 } else {
  39                         // at this stage :
  40                         // image is completely known
  41                         assert imageSize.width() != 0 && imageSize.height() != 0;
  42                         // one and only one of the dimension as been specified
  43                         assert preferredSize.width() == 0 || preferredSize.height() == 0;
  44                         size = resizeTo(imageSize, preferredSize);
  45                 }
  46
  47                 boolean loaded = false;
  48                 if (control == null)
  49                         return loaded;
  50
  51                 if (control instanceof Label) {
  52                         if (imgTag == null) {
  53                                 // IMAGE RETRIEVED HERE
  54                                 imgTag = getImageTag(node, size);
  55                                 //
  56                                 if (imgTag == null)
  57                                         imgTag = noImg(size);
  58                                 else
  59                                         loaded = true;
  60                         }
  61
  62                         Label lbl = (Label) control;
  63                         StringBuilder sb = new StringBuilder();
  64                         if (link != null)
  65                                 sb.append("<a href='").append(URLEncoder.encode(link.toString(), StandardCharsets.UTF_8)).append("'>");
  66                         sb.append(imgTag);
  67                         if (link != null)
  68                                 sb.append("</a>");
  69
  70                         lbl.setText(imgTag);
  71                         // lbl.setSize(size);
  72 //              } else if (control instanceof FileUpload) {
  73 //                      FileUpload lbl = (FileUpload) control;
  74 //                      lbl.setImage(CmsUiUtils.noImage(size));
  75 //                      lbl.setSize(new Point(size.getWidth(), size.getHeight()));
  76 //                      return loaded;
  77                 } else
  78                         loaded = false;
  79
  80                 return loaded;
  81         }
  82
  83         public Cms2DSize getImageSize(M node) {
  84                 // TODO optimise
  85                 ImageData imageData = getSwtImageData(node);
  86                 return new Cms2DSize(imageData.width, imageData.height);
  87         }
  88
  89 }