org.argeo.cms.ux/src/org/argeo/cms/ux/AbstractImageManager.java

   1 package org.argeo.cms.ux;
   2
   3 import org.argeo.api.cms.ux.Cms2DSize;
   4 import org.argeo.api.cms.ux.CmsImageManager;
   5
   6 /** Manages only public images so far. */
   7 public abstract class AbstractImageManager<V, M> implements CmsImageManager<V, M> {
   8         public final static String NO_IMAGE = "icons/noPic-square-640px.png";
   9         public final static Cms2DSize NO_IMAGE_SIZE = new Cms2DSize(320, 320);
  10         public final static Float NO_IMAGE_RATIO = 1f;
  11
  12         protected Cms2DSize resizeTo(Cms2DSize orig, Cms2DSize constraints) {
  13                 if (constraints.getWidth() != 0 && constraints.getHeight() != 0) {
  14                         return constraints;
  15                 } else if (constraints.getWidth() == 0 && constraints.getHeight() == 0) {
  16                         return orig;
  17                 } else if (constraints.getHeight() == 0) {// force width
  18                         return new Cms2DSize(constraints.getWidth(),
  19                                         scale(orig.getHeight(), orig.getWidth(), constraints.getWidth()));
  20                 } else if (constraints.getWidth() == 0) {// force height
  21                         return new Cms2DSize(scale(orig.getWidth(), orig.getHeight(), constraints.getHeight()),
  22                                         constraints.getHeight());
  23                 }
  24                 throw new IllegalArgumentException("Cannot resize " + orig + " to " + constraints);
  25         }
  26
  27         protected int scale(int origDimension, int otherDimension, int otherConstraint) {
  28                 return Math.round(origDimension * divide(otherConstraint, otherDimension));
  29         }
  30
  31         protected float divide(int a, int b) {
  32                 return ((float) a) / ((float) b);
  33         }
  34
  35         /** @return null if not available */
  36         @Override
  37         public String getImageTag(M node) {
  38                 return getImageTag(node, getImageSize(node));
  39         }
  40
  41         protected String getImageTag(M node, Cms2DSize size) {
  42                 StringBuilder buf = getImageTagBuilder(node, size);
  43                 if (buf == null)
  44                         return null;
  45                 return buf.append("/>").toString();
  46         }
  47
  48         /** @return null if not available */
  49         @Override
  50         public StringBuilder getImageTagBuilder(M node, Cms2DSize size) {
  51                 return getImageTagBuilder(node, Integer.toString(size.getWidth()), Integer.toString(size.getHeight()));
  52         }
  53
  54         /** @return null if not available */
  55         protected StringBuilder getImageTagBuilder(M node, String width, String height) {
  56                 String url = getImageUrl(node);
  57                 if (url == null)
  58                         return null;
  59                 return CmsUxUtils.imgBuilder(url, width, height);
  60         }
  61
  62 }