bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/symbolEditor/GridVisibleFunction.java

   1 /*******************************************************************************
   2  * Copyright (c) 2013 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     Semantum Oy - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.modeling.ui.symbolEditor;
  13
  14 import org.simantics.g2d.canvas.ICanvasContext;
  15 import org.simantics.g2d.participant.GridPainter;
  16 import org.simantics.scl.runtime.function.Function1;
  17 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
  18 import org.simantics.utils.datastructures.hints.IHintContext;
  19 import org.simantics.utils.datastructures.hints.IHintObservable;
  20 import org.simantics.utils.datastructures.hints.IHintContext.Key;
  21
  22 /**
  23  * A function and a listener for diagram grid visibility. The function
  24  * returns the current grid visibility as a Boolean.
  25  *
  26  * @author Tuukka Lehtonen
  27  */
  28 public class GridVisibleFunction extends HintListenerAdapter implements Function1<Object, Boolean> {
  29
  30         Boolean enabled;
  31
  32         public GridVisibleFunction(ICanvasContext ctx) {
  33                 IHintContext hctx = ctx.getDefaultHintContext();
  34                 // Initialize state
  35                 hintChanged(hctx, GridPainter.KEY_GRID_ENABLED, null, hctx.getHint(GridPainter.KEY_GRID_ENABLED));
  36                 // Start listening
  37                 hctx.addKeyHintListener(GridPainter.KEY_GRID_ENABLED, this);
  38         }
  39
  40         @Override
  41         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
  42                 enabled = Boolean.valueOf(Boolean.TRUE.equals(newValue));
  43         }
  44
  45         @Override
  46         public Boolean apply(Object p0) {
  47                 return enabled;
  48         }
  49
  50 }