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.api.cms.ux.CmsIcon;
   9 import org.argeo.cms.osgi.BundleCmsTheme;
  10 import org.argeo.cms.swt.CmsSwtTheme;
  11 import org.eclipse.swt.graphics.Image;
  12 import org.eclipse.swt.graphics.ImageData;
  13 import org.eclipse.swt.widgets.Display;
  14
  15 /** Centralises some generic {@link CmsSwtTheme} patterns. */
  16 public class BundleCmsSwtTheme extends BundleCmsTheme implements CmsSwtTheme {
  17         private Map<String, ImageData> imageCache = new HashMap<>();
  18
  19         private Map<String, Map<Integer, String>> iconPaths = new HashMap<>();
  20
  21         protected 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         /**
  38          * And icon with this file name (without the extension), with a best effort to
  39          * find the appropriate size, or <code>null</code> if not found.
  40          *
  41          * @param name          An icon file name without path and extension.
  42          * @param preferredSize the preferred size, if <code>null</code>,
  43          *                      {@link #getSmallIconSize()} will be tried.
  44          */
  45         public Image getIcon(String name, Integer preferredSize) {
  46                 if (preferredSize == null)
  47                         preferredSize = getSmallIconSize();
  48                 Map<Integer, String> subCache;
  49                 if (!iconPaths.containsKey(name))
  50                         subCache = new HashMap<>();
  51                 else
  52                         subCache = iconPaths.get(name);
  53                 Image image = null;
  54                 if (!subCache.containsKey(preferredSize)) {
  55                         Image bestMatchSoFar = null;
  56                         paths: for (String p : getImagesPaths()) {
  57                                 int lastSlash = p.lastIndexOf('/');
  58                                 String fileName = p;
  59                                 String ext = "";
  60                                 if (lastSlash >= 0)
  61                                         fileName = p.substring(lastSlash + 1);
  62                                 int lastDot = fileName.lastIndexOf('.');
  63                                 if (lastDot >= 0) {
  64                                         ext = fileName.substring(lastDot + 1);
  65                                         fileName = fileName.substring(0, lastDot);
  66                                 }
  67
  68                                 if ("svg".equals(ext))
  69                                         continue paths;
  70
  71                                 if (fileName.equals(name)) {// matched
  72                                         Image img = getImage(p);
  73                                         int width = img.getBounds().width;
  74                                         if (width == preferredSize) {// perfect match
  75                                                 subCache.put(preferredSize, p);
  76                                                 image = img;
  77                                                 break paths;
  78                                         }
  79                                         if (bestMatchSoFar == null) {
  80                                                 bestMatchSoFar = img;
  81                                         } else {
  82                                                 if (Math.abs(width - preferredSize) < Math
  83                                                                 .abs(bestMatchSoFar.getBounds().width - preferredSize))
  84                                                         bestMatchSoFar = img;
  85                                         }
  86                                 }
  87                         }
  88
  89                         if (image == null)
  90                                 image = bestMatchSoFar;
  91                 } else {
  92                         image = getImage(subCache.get(preferredSize));
  93                 }
  94
  95                 if (image != null && !iconPaths.containsKey(name))
  96                         iconPaths.put(name, subCache);
  97
  98                 return image;
  99         }
 100
 101         @Override
 102         public Image getSmallIcon(CmsIcon icon) {
 103                 return getIcon(icon.name(), getSmallIconSize());
 104         }
 105
 106         @Override
 107         public Image getBigIcon(CmsIcon icon) {
 108                 return getIcon(icon.name(), getBigIconSize());
 109         }
 110
 111 }