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, ImageData> 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                                 imageCache.put(path, imageData);
  28                         } catch (IOException e) {
  29                                 throw new IllegalStateException(e);
  30                         }
  31                 }
  32                 ImageData imageData = imageCache.get(path);
  33                 Image image = new Image(Display.getCurrent(), imageData);
  34                 return image;
  35         }
  36
  37         @Override
  38         public Image getIcon(String name, Integer preferredSize) {
  39                 if (preferredSize == null)
  40                         preferredSize = defaultIconSize;
  41                 Map<Integer, String> subCache;
  42                 if (!iconPaths.containsKey(name))
  43                         subCache = new HashMap<>();
  44                 else
  45                         subCache = iconPaths.get(name);
  46                 Image image = null;
  47                 if (!subCache.containsKey(preferredSize)) {
  48                         Image bestMatchSoFar = null;
  49                         paths: for (String p : getImagesPaths()) {
  50                                 int lastSlash = p.lastIndexOf('/');
  51                                 String fileName = p;
  52                                 if (lastSlash >= 0)
  53                                         fileName = p.substring(lastSlash + 1);
  54                                 int lastDot = fileName.lastIndexOf('.');
  55                                 if (lastDot >= 0)
  56                                         fileName = fileName.substring(0, lastDot);
  57                                 if (fileName.equals(name)) {// matched
  58                                         Image img = getImage(p);
  59                                         int width = img.getBounds().width;
  60                                         if (width == preferredSize) {// perfect match
  61                                                 subCache.put(preferredSize, p);
  62                                                 image = img;
  63                                                 break paths;
  64                                         }
  65                                         if (bestMatchSoFar == null) {
  66                                                 bestMatchSoFar = img;
  67                                         } else {
  68                                                 if (Math.abs(width - preferredSize) < Math
  69                                                                 .abs(bestMatchSoFar.getBounds().width - preferredSize))
  70                                                         bestMatchSoFar = img;
  71                                         }
  72                                 }
  73                         }
  74
  75                         if (image == null)
  76                                 image = bestMatchSoFar;
  77                 } else {
  78                         image = getImage(subCache.get(preferredSize));
  79                 }
  80
  81                 if (image != null && !iconPaths.containsKey(name))
  82                         iconPaths.put(name, subCache);
  83
  84                 return image;
  85         }
  86
  87         @Override
  88         public Integer getDefaultIconSize() {
  89                 return defaultIconSize;
  90         }
  91
  92 }