org.argeo.cms.ui/src/org/argeo/cms/ui/util/AbstractCmsTheme.java

   1 package org.argeo.cms.ui.util;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.util.HashMap;
   6 import java.util.Map;
   7
   8 import org.argeo.cms.ui.CmsTheme;
   9 import org.eclipse.swt.graphics.Image;
  10 import org.eclipse.swt.graphics.ImageData;
  11 import org.eclipse.swt.widgets.Display;
  12
  13 /** Centralises some generic {@link CmsTheme} patterns. */
  14 public abstract class AbstractCmsTheme implements CmsTheme {
  15         private Map<String, Image> imageCache = new HashMap<>();
  16
  17         private Map<String, Map<Integer, String>> iconPaths = new HashMap<>();
  18
  19         private Integer defaultIconSize = 16;
  20
  21         public Image getImage(String path) {
  22                 if (!imageCache.containsKey(path)) {
  23                         try (InputStream in = getResourceAsStream(path)) {
  24                                 if (in == null)
  25                                         return null;
  26                                 ImageData imageData = new ImageData(in);
  27                                 Image image = new Image(Display.getDefault(), imageData);
  28                                 imageCache.put(path, image);
  29                         } catch (IOException e) {
  30                                 throw new IllegalStateException(e);
  31                         }
  32                 }
  33                 return imageCache.get(path);
  34         }
  35
  36         @Override
  37         public Image getIcon(String name, Integer preferredSize) {
  38                 if (preferredSize == null)
  39                         preferredSize = defaultIconSize;
  40                 Map<Integer, String> subCache;
  41                 if (!iconPaths.containsKey(name))
  42                         subCache = new HashMap<>();
  43                 else
  44                         subCache = iconPaths.get(name);
  45                 Image image = null;
  46                 if (!subCache.containsKey(preferredSize)) {
  47                         Image bestMatchSoFar = null;
  48                         paths: for (String p : getImagesPaths()) {
  49                                 int lastSlash = p.lastIndexOf('/');
  50                                 String fileName = p;
  51                                 if (lastSlash >= 0)
  52                                         fileName = p.substring(lastSlash + 1);
  53                                 int lastDot = fileName.lastIndexOf('.');
  54                                 if (lastDot >= 0)
  55                                         fileName = fileName.substring(0, lastDot);
  56                                 if (fileName.equals(name)) {// matched
  57                                         Image img = getImage(p);
  58                                         int width = img.getBounds().width;
  59                                         if (width == preferredSize) {// perfect match
  60                                                 subCache.put(preferredSize, p);
  61                                                 image = img;
  62                                                 break paths;
  63                                         }
  64                                         if (bestMatchSoFar == null) {
  65                                                 bestMatchSoFar = img;
  66                                         } else {
  67                                                 if (Math.abs(width - preferredSize) < Math
  68                                                                 .abs(bestMatchSoFar.getBounds().width - preferredSize))
  69                                                         bestMatchSoFar = img;
  70                                         }
  71                                 }
  72                         }
  73
  74                         if (image == null)
  75                                 image = bestMatchSoFar;
  76                 } else {
  77                         image = getImage(subCache.get(preferredSize));
  78                 }
  79
  80                 if (image != null && !iconPaths.containsKey(name))
  81                         iconPaths.put(name, subCache);
  82
  83                 return image;
  84         }
  85
  86         @Override
  87         public Integer getDefaultIconSize() {
  88                 return defaultIconSize;
  89         }
  90
  91 }