eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/osgi/BundleCmsSwtTheme.java

   1 package org.argeo.cms.swt.osgi;
   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.osgi.BundleCmsTheme;
   9 import org.argeo.cms.swt.CmsSwtTheme;
  10 import org.eclipse.swt.graphics.Image;
  11 import org.eclipse.swt.graphics.ImageData;
  12 import org.eclipse.swt.widgets.Display;
  13
  14 /** Centralises some generic {@link CmsSwtTheme} patterns. */
  15 public class BundleCmsSwtTheme extends BundleCmsTheme implements CmsSwtTheme {
  16         private Map<String, ImageData> imageCache = new HashMap<>();
  17
  18         private Map<String, Map<Integer, String>> iconPaths = new HashMap<>();
  19
  20         public Image getImage(String path) {
  21                 if (!imageCache.containsKey(path)) {
  22                         try (InputStream in = getResourceAsStream(path)) {
  23                                 if (in == null)
  24                                         return null;
  25                                 ImageData imageData = new ImageData(in);
  26                                 imageCache.put(path, imageData);
  27                         } catch (IOException e) {
  28                                 throw new IllegalStateException(e);
  29                         }
  30                 }
  31                 ImageData imageData = imageCache.get(path);
  32                 Image image = new Image(Display.getCurrent(), imageData);
  33                 return image;
  34         }
  35
  36         /**
  37          * And icon with this file name (without the extension), with a best effort to
  38          * find the appropriate size, or <code>null</code> if not found.
  39          *
  40          * @param name          An icon file name without path and extension.
  41          * @param preferredSize the preferred size, if <code>null</code>,
  42          *                      {@link #getDefaultIconSize()} will be tried.
  43          */
  44         public Image getIcon(String name, Integer preferredSize) {
  45                 if (preferredSize == null)
  46                         preferredSize = getDefaultIconSize();
  47                 Map<Integer, String> subCache;
  48                 if (!iconPaths.containsKey(name))
  49                         subCache = new HashMap<>();
  50                 else
  51                         subCache = iconPaths.get(name);
  52                 Image image = null;
  53                 if (!subCache.containsKey(preferredSize)) {
  54                         Image bestMatchSoFar = null;
  55                         paths: for (String p : getImagesPaths()) {
  56                                 int lastSlash = p.lastIndexOf('/');
  57                                 String fileName = p;
  58                                 if (lastSlash >= 0)
  59                                         fileName = p.substring(lastSlash + 1);
  60                                 int lastDot = fileName.lastIndexOf('.');
  61                                 if (lastDot >= 0)
  62                                         fileName = fileName.substring(0, lastDot);
  63                                 if (fileName.equals(name)) {// matched
  64                                         Image img = getImage(p);
  65                                         int width = img.getBounds().width;
  66                                         if (width == preferredSize) {// perfect match
  67                                                 subCache.put(preferredSize, p);
  68                                                 image = img;
  69                                                 break paths;
  70                                         }
  71                                         if (bestMatchSoFar == null) {
  72                                                 bestMatchSoFar = img;
  73                                         } else {
  74                                                 if (Math.abs(width - preferredSize) < Math
  75                                                                 .abs(bestMatchSoFar.getBounds().width - preferredSize))
  76                                                         bestMatchSoFar = img;
  77                                         }
  78                                 }
  79                         }
  80
  81                         if (image == null)
  82                                 image = bestMatchSoFar;
  83                 } else {
  84                         image = getImage(subCache.get(preferredSize));
  85                 }
  86
  87                 if (image != null && !iconPaths.containsKey(name))
  88                         iconPaths.put(name, subCache);
  89
  90                 return image;
  91         }
  92
  93 }