bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/ViewerCellReference.java

   1 package org.simantics.browsing.ui.swt;\r
   2 \r
   3 import org.eclipse.jface.viewers.ViewerCell;\r
   4 import org.simantics.browsing.ui.common.internal.UIElementReference;\r
   5 \r
   6 /**\r
   7  * "Reference" to a viewer cell.\r
   8  * \r
   9  * ViewerCell is an object, which is not immutable, and has a very short lifespan. Hence we store its element and columnIndex.\r
  10  * \r
  11  * \r
  12  * @author Marko Luukkainen <marko.luukkainen@vtt.fi>\r
  13  *\r
  14  */\r
  15 public class ViewerCellReference implements UIElementReference{\r
  16         \r
  17         private final Object element;\r
  18         private final int column;\r
  19         \r
  20         public static ViewerCellReference create(ViewerCell cell) {\r
  21                 return new ViewerCellReference(cell);\r
  22         }\r
  23         \r
  24         private ViewerCellReference(ViewerCell cell) {\r
  25                 this.element = cell.getElement();\r
  26                 this.column = cell.getColumnIndex();\r
  27         }\r
  28         \r
  29         @Override\r
  30         public boolean hasReference() {\r
  31                 return element != null;\r
  32         }\r
  33         \r
  34         @Override\r
  35         public boolean isDisposed() {\r
  36                 if (element == null)\r
  37                         return true;\r
  38                 return false;\r
  39         }\r
  40         \r
  41         public Object getElement() {\r
  42                 return element;\r
  43         }\r
  44         \r
  45         public int getColumn() {\r
  46                 return column;\r
  47         }\r
  48         \r
  49         @Override\r
  50         public int hashCode() {\r
  51                 return element.hashCode() + column;\r
  52                 \r
  53         }\r
  54         \r
  55         @Override\r
  56         public boolean equals(Object obj) {\r
  57                 if (obj == null)\r
  58                         return false;\r
  59                 if (obj.getClass() != getClass())\r
  60                         return false;\r
  61                 ViewerCellReference other = (ViewerCellReference)obj;\r
  62                 if (column != other.column)\r
  63                         return false;\r
  64                 return element.equals(other.element);\r
  65         }\r
  66 }\r