gerrit.simantics Code Review - simantics/platform.git/blob

   1 package org.simantics.browsing.ui.model.tooltips;
   2
   3 import java.util.Map;
   4
   5 import org.eclipse.swt.SWT;
   6 import org.eclipse.swt.graphics.FontMetrics;
   7 import org.eclipse.swt.graphics.GC;
   8 import org.eclipse.swt.layout.GridData;
   9 import org.eclipse.swt.layout.GridLayout;
  10 import org.eclipse.swt.widgets.Composite;
  11 import org.eclipse.swt.widgets.Text;
  12 import org.simantics.browsing.ui.BuiltinKeys;
  13 import org.simantics.browsing.ui.NodeContext;
  14 import org.simantics.db.ReadGraph;
  15 import org.simantics.db.Resource;
  16 import org.simantics.db.exception.DatabaseException;
  17 import org.simantics.db.layer0.variable.Variable;
  18 import org.simantics.layer0.Layer0;
  19
  20 public class DescriptionTooltipRule implements TooltipRule {
  21
  22     public static final DescriptionTooltipRule INSTANCE = new DescriptionTooltipRule();
  23
  24     public DescriptionTooltipRule() {
  25     }
  26
  27     @Override
  28     public Object createTooltip(Object event, Object parentComponent, NodeContext context, Map<Object, Object> auxiliary) {
  29         Composite parent = (Composite)parentComponent;
  30         Composite composite = new Composite(parent, SWT.NONE);
  31         //ScrolledComposite composite = new ScrolledComposite(parent, SWT.NONE);
  32
  33         composite.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
  34         GridLayout layout = new GridLayout(1, false);
  35         composite.setLayout(layout);
  36         Text text = new Text(composite, SWT.NONE | SWT.READ_ONLY | SWT.WRAP);
  37         text.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
  38
  39         String toolTipContent = (String) auxiliary.get("content");
  40         text.setText(toolTipContent);
  41
  42         GC gc = new GC(text);
  43         FontMetrics fm = gc.getFontMetrics();
  44         int width = toolTipContent.length() * fm.getAverageCharWidth();
  45         gc.dispose();
  46         GridData gridData = new GridData();
  47         if (width < 500)
  48             gridData.widthHint = width;
  49         else
  50             gridData.widthHint = 500;
  51
  52         text.setLayoutData(gridData);
  53
  54         return composite;
  55     }
  56
  57     @Override
  58     public boolean isCompatible(Class<?> contentType) {
  59         return (contentType == Resource.class || contentType == Variable.class);
  60     }
  61
  62     private static String getToolTipContent(ReadGraph graph, NodeContext nodeContext) throws DatabaseException {
  63         Object input = nodeContext.getConstant(BuiltinKeys.INPUT);
  64         String content = null;
  65         if (input instanceof Variable) {
  66             Variable var = (Variable) input;
  67             Resource res = var.getPredicateResource(graph);
  68             Layer0 L0 = Layer0.getInstance(graph);
  69             String description = graph.getPossibleRelatedValue2(res, L0.HasDescription);
  70             return description;
  71         } else if (input instanceof Resource) {
  72             Resource res = (Resource) input;
  73
  74             Layer0 L0 = Layer0.getInstance(graph);
  75             String description = graph.getPossibleRelatedValue2(res, L0.HasDescription);
  76             return description;
  77         }
  78         return content;
  79     }
  80
  81     @Override
  82     public boolean shouldCreateToolTip(ReadGraph graph  , NodeContext context, Map<Object, Object> auxiliary) throws DatabaseException {
  83         String content = getToolTipContent(graph, context);
  84         if (content == null || content.isEmpty())
  85             return false;
  86         auxiliary.put("content", content);
  87         return true;
  88     }
  89
  90 }