Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.modeling.ui / src / org / simantics / modeling / ui / symbolEditor / GridVisibleFunction.java

diff --git a/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/symbolEditor/GridVisibleFunction.java b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/symbolEditor/GridVisibleFunction.java
new file mode 100644 (file)
index 0000000..b708d57
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+++ b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/symbolEditor/GridVisibleFunction.java
@@ -0,0 +1,50 @@
+/*******************************************************************************\r
+ * Copyright (c) 2013 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     Semantum Oy - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.modeling.ui.symbolEditor;\r
+\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.participant.GridPainter;\r
+import org.simantics.scl.runtime.function.Function1;\r
+import org.simantics.utils.datastructures.hints.HintListenerAdapter;\r
+import org.simantics.utils.datastructures.hints.IHintContext;\r
+import org.simantics.utils.datastructures.hints.IHintObservable;\r
+import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
+\r
+/**\r
+ * A function and a listener for diagram grid visibility. The function\r
+ * returns the current grid visibility as a Boolean.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class GridVisibleFunction extends HintListenerAdapter implements Function1<Object, Boolean> {\r
+\r
+       Boolean enabled;\r
+\r
+       public GridVisibleFunction(ICanvasContext ctx) {\r
+               IHintContext hctx = ctx.getDefaultHintContext();\r
+               // Initialize state\r
+               hintChanged(hctx, GridPainter.KEY_GRID_ENABLED, null, hctx.getHint(GridPainter.KEY_GRID_ENABLED));\r
+               // Start listening\r
+               hctx.addKeyHintListener(GridPainter.KEY_GRID_ENABLED, this);\r
+       }\r
+\r
+       @Override\r
+       public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {\r
+               enabled = Boolean.valueOf(Boolean.TRUE.equals(newValue));\r
+       }\r
+\r
+       @Override\r
+       public Boolean apply(Object p0) {\r
+               return enabled;\r
+       }\r
+\r
+}
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