bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/KeyToSelectionAdapter.java

   1 package org.simantics.browsing.ui.nattable;
   2
   3 import java.util.Collection;
   4 import java.util.List;
   5 import java.util.regex.Pattern;
   6
   7 import org.eclipse.jface.viewers.IStructuredSelection;
   8 import org.eclipse.nebula.widgets.nattable.NatTable;
   9 import org.eclipse.swt.events.KeyAdapter;
  10 import org.eclipse.swt.events.KeyEvent;
  11 import org.simantics.browsing.ui.GraphExplorer;
  12 import org.simantics.utils.ui.AdaptionUtils;
  13
  14 /**
  15  * Selects tree items based on pressed key events.<p>
  16  *
  17  *
  18  * @author Marko Luukkainen <marko.luukkainen@vtt.fi>
  19  *
  20  */
  21 public class KeyToSelectionAdapter extends KeyAdapter {
  22
  23         private static final int KEY_INPUT_DELAY = 500;
  24
  25     private final NatTableGraphExplorer          explorer;
  26
  27     private String matcher = "";
  28     private int prevEvent = 0;
  29     private int columns = 0;
  30
  31     protected Pattern alphaNum;
  32
  33     /**
  34      * @param contextProvider
  35      * @param explorer
  36      */
  37     public KeyToSelectionAdapter(GraphExplorer explorer) {
  38         assert explorer != null;
  39
  40         this.explorer = (NatTableGraphExplorer)explorer;
  41         this.alphaNum = Pattern.compile("\\p{Alnum}");
  42     }
  43
  44     @Override
  45     public void keyPressed(KeyEvent e) {
  46         if (explorer.isDisposed())
  47             return;
  48
  49
  50          if (!alphaNum.matcher(Character.toString(e.character)).matches())
  51                  return;
  52          // concatenate / replace matcher.
  53          if ((e.time - prevEvent) > KEY_INPUT_DELAY )
  54                  matcher = "";
  55          prevEvent = e.time;
  56          matcher = matcher += Character.toString(e.character);
  57
  58          NatTable tree = explorer.getControl();
  59          columns = explorer.getColumns().length;
  60
  61          IStructuredSelection sel = (IStructuredSelection)explorer.getWidgetSelection();
  62          Collection<RowSelectionItem> selected = AdaptionUtils.adaptToCollection(sel, RowSelectionItem.class);
  63
  64
  65          TreeNode item = find(tree, selected);
  66
  67          if (item == null && matcher.length() > 1) {
  68                  matcher = matcher.substring(matcher.length()-1);
  69                  item = find(tree, selected);
  70          }
  71
  72          if (item != null) {
  73                  explorer.select(item);
  74                  explorer.show(item);
  75                  }
  76          // without this the default handling would take over.
  77          e.doit = false;
  78     }
  79
  80     private TreeNode previous = null;
  81     private boolean foundPrev = false;
  82
  83         private TreeNode find(NatTable tree, Collection<RowSelectionItem> selected) {
  84                 TreeNode item = null;
  85
  86                 List<TreeNode> items = explorer.getItems();
  87
  88                 if (selected.size() == 0) {
  89                         previous = null;
  90                         foundPrev = true;
  91                         item = findItem(items);
  92
  93                 } else {
  94                         previous = selected.iterator().next().item;
  95                         foundPrev = false;
  96                         item = findItem(items);
  97                         if (item == null) {
  98                                 previous = null;
  99                                 foundPrev = true;
 100                                 item = findItem(items);
 101                         }
 102                 }
 103                 return item;
 104         }
 105
 106     private TreeNode findItem(List<TreeNode> items) {
 107         for (int i = 0; i < items.size(); i++) {
 108                 TreeNode item = items.get(i);
 109                 if (item != previous) {
 110                         if (foundPrev && matches(item, columns, matcher))
 111                                 return item;
 112
 113                 } else {
 114                         foundPrev = true;
 115                 }
 116         }
 117         return null;
 118     }
 119
 120
 121     /**
 122      *
 123      * @param item
 124      * @param depth Depth of the item in the tree.
 125      * @param columns Number of columns.
 126      * @param string Matching string.
 127      * @return
 128      */
 129     protected boolean matches(TreeNode item, int columns, String matcher) {
 130         for (int c = 0; c < columns; c++) {
 131                         if (matchesColumn(item, c, matcher)) {
 132                                 return true;
 133                         }
 134                 }
 135         return false;
 136     }
 137
 138     /**
 139      *
 140      * @param item
 141      * @param column
 142      * @param matcher
 143      * @return
 144      */
 145     protected boolean matchesColumn(TreeNode item, int column, String matcher) {
 146         String text = item.getValueString(column);
 147                 if (text.toLowerCase().startsWith(matcher)) {
 148                         return true;
 149                 }
 150                 return false;
 151     }
 152
 153 }