AbstractSwtImageManager.java

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