swt/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/CmsLink.java

   1 package org.argeo.cms.swt.widgets;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.net.MalformedURLException;
   6 import java.net.URL;
   7
   8 import org.argeo.api.cms.CmsLog;
   9 import org.argeo.api.cms.ux.CmsStyle;
  10 import org.argeo.cms.swt.CmsSwtUtils;
  11 import org.eclipse.rap.rwt.RWT;
  12 import org.eclipse.rap.rwt.service.ResourceManager;
  13 import org.eclipse.swt.SWT;
  14 import org.eclipse.swt.events.MouseListener;
  15 import org.eclipse.swt.graphics.ImageData;
  16 import org.eclipse.swt.layout.GridData;
  17 import org.eclipse.swt.widgets.Composite;
  18 import org.eclipse.swt.widgets.Control;
  19 import org.eclipse.swt.widgets.Label;
  20 import org.osgi.framework.BundleContext;
  21
  22 /** A link to an internal or external location. */
  23 public class CmsLink {
  24         private final static CmsLog log = CmsLog.getLog(CmsLink.class);
  25         private BundleContext bundleContext;
  26
  27         private String label;
  28         private String style;
  29         private String target;
  30         private String image;
  31         private boolean openNew = false;
  32         private MouseListener mouseListener;
  33
  34         private int horizontalAlignment = SWT.CENTER;
  35         private int verticalAlignment = SWT.CENTER;
  36
  37         // internal
  38         // private Boolean isUrl = false;
  39         private Integer imageWidth, imageHeight;
  40
  41         public CmsLink() {
  42                 super();
  43         }
  44
  45         public CmsLink(String label, String target) {
  46                 this(label, target, (String) null);
  47         }
  48
  49         public CmsLink(String label, String target, CmsStyle style) {
  50                 this(label, target, style != null ? style.style() : null);
  51         }
  52
  53         public CmsLink(String label, String target, String style) {
  54                 super();
  55                 this.label = label;
  56                 this.target = target;
  57                 this.style = style;
  58                 init();
  59         }
  60
  61         public void init() {
  62                 if (image != null) {
  63                         ImageData image = loadImage();
  64                         if (imageHeight == null && imageWidth == null) {
  65                                 imageWidth = image.width;
  66                                 imageHeight = image.height;
  67                         } else if (imageHeight == null) {
  68                                 imageHeight = (imageWidth * image.height) / image.width;
  69                         } else if (imageWidth == null) {
  70                                 imageWidth = (imageHeight * image.width) / image.height;
  71                         }
  72                 }
  73         }
  74
  75         /** @return {@link Composite} with a single {@link Label} child. */
  76         public Control createUi(Composite parent) {
  77 //              if (image != null && (imageWidth == null || imageHeight == null)) {
  78 //                      throw new CmsException("Image is not properly configured."
  79 //                                      + " Make sure bundleContext property is set and init() method has been called.");
  80 //              }
  81
  82                 Composite comp = new Composite(parent, SWT.NONE);
  83                 comp.setLayout(CmsSwtUtils.noSpaceGridLayout());
  84
  85                 Label link = new Label(comp, SWT.NONE);
  86                 CmsSwtUtils.markup(link);
  87                 GridData layoutData = new GridData(horizontalAlignment, verticalAlignment, false, false);
  88                 if (image != null) {
  89                         if (imageHeight != null)
  90                                 layoutData.heightHint = imageHeight;
  91                         if (label == null)
  92                                 if (imageWidth != null)
  93                                         layoutData.widthHint = imageWidth;
  94                 }
  95
  96                 link.setLayoutData(layoutData);
  97                 CmsSwtUtils.style(comp, style != null ? style : getDefaultStyle());
  98                 CmsSwtUtils.style(link, style != null ? style : getDefaultStyle());
  99
 100                 // label
 101                 StringBuilder labelText = new StringBuilder();
 102                 if (target != null) {
 103                         labelText.append("<a style='color:inherit;text-decoration:inherit;' href='");
 104                         labelText.append(target).append("'");
 105                         if (openNew) {
 106                                 labelText.append(" target='_blank'");
 107                         }
 108                         labelText.append(">");
 109                 }
 110                 if (image != null) {
 111                         registerImageIfNeeded();
 112                         String imageLocation = RWT.getResourceManager().getLocation(image);
 113                         labelText.append("<img");
 114                         if (imageWidth != null)
 115                                 labelText.append(" width='").append(imageWidth).append('\'');
 116                         if (imageHeight != null)
 117                                 labelText.append(" height='").append(imageHeight).append('\'');
 118                         labelText.append(" src=\"").append(imageLocation).append("\"/>");
 119
 120                 }
 121
 122                 if (label != null) {
 123                         labelText.append(' ').append(label);
 124                 }
 125
 126                 if (target != null)
 127                         labelText.append("</a>");
 128
 129                 link.setText(labelText.toString());
 130
 131                 if (mouseListener != null)
 132                         link.addMouseListener(mouseListener);
 133
 134                 return comp;
 135         }
 136
 137         private void registerImageIfNeeded() {
 138                 ResourceManager resourceManager = RWT.getResourceManager();
 139                 if (!resourceManager.isRegistered(image)) {
 140                         URL res = getImageUrl();
 141                         try (InputStream inputStream = res.openStream()) {
 142                                 resourceManager.register(image, inputStream);
 143                                 if (log.isTraceEnabled())
 144                                         log.trace("Registered image " + image);
 145                         } catch (IOException e) {
 146                                 throw new RuntimeException("Cannot load image " + image, e);
 147                         }
 148                 }
 149         }
 150
 151         private ImageData loadImage() {
 152                 URL url = getImageUrl();
 153                 ImageData result = null;
 154                 try (InputStream inputStream = url.openStream()) {
 155                         result = new ImageData(inputStream);
 156                         if (log.isTraceEnabled())
 157                                 log.trace("Loaded image " + image);
 158                 } catch (IOException e) {
 159                         throw new RuntimeException("Cannot load image " + image, e);
 160                 }
 161                 return result;
 162         }
 163
 164         private URL getImageUrl() {
 165                 URL url;
 166                 try {
 167                         // pure URL
 168                         url = new URL(image);
 169                 } catch (MalformedURLException e1) {
 170                         url = bundleContext.getBundle().getResource(image);
 171                 }
 172
 173                 if (url == null)
 174                         throw new IllegalStateException("No image " + image + " available.");
 175
 176                 return url;
 177         }
 178
 179         public void setBundleContext(BundleContext bundleContext) {
 180                 this.bundleContext = bundleContext;
 181         }
 182
 183         public void setLabel(String label) {
 184                 this.label = label;
 185         }
 186
 187         public void setStyle(String style) {
 188                 this.style = style;
 189         }
 190
 191         /** @deprecated Use {@link #setStyle(String)} instead. */
 192         @Deprecated
 193         public void setCustom(String custom) {
 194                 this.style = custom;
 195         }
 196
 197         public void setTarget(String target) {
 198                 this.target = target;
 199         }
 200
 201         public void setImage(String image) {
 202                 this.image = image;
 203         }
 204
 205         public void setMouseListener(MouseListener mouseListener) {
 206                 this.mouseListener = mouseListener;
 207         }
 208
 209         public void setvAlign(String vAlign) {
 210                 if ("bottom".equals(vAlign)) {
 211                         verticalAlignment = SWT.BOTTOM;
 212                 } else if ("top".equals(vAlign)) {
 213                         verticalAlignment = SWT.TOP;
 214                 } else if ("center".equals(vAlign)) {
 215                         verticalAlignment = SWT.CENTER;
 216                 } else {
 217                         throw new IllegalArgumentException(
 218                                         "Unsupported vertical alignment " + vAlign + " (must be: top, bottom or center)");
 219                 }
 220         }
 221
 222         public void setImageWidth(Integer imageWidth) {
 223                 this.imageWidth = imageWidth;
 224         }
 225
 226         public void setImageHeight(Integer imageHeight) {
 227                 this.imageHeight = imageHeight;
 228         }
 229
 230         public void setOpenNew(boolean openNew) {
 231                 this.openNew = openNew;
 232         }
 233
 234         protected String getDefaultStyle() {
 235                 return "link";
 236 //              return SimpleStyle.link.name();
 237         }
 238 }