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[simantics/district.git] / org.simantics.district.maps / src / org / simantics / maps / eclipse / MapPainter.java

diff --git a/org.simantics.district.maps/src/org/simantics/maps/eclipse/MapPainter.java b/org.simantics.district.maps/src/org/simantics/maps/eclipse/MapPainter.java
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+/*******************************************************************************
+ * Copyright (c) 2012 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.maps.eclipse;
+
+import org.simantics.g2d.canvas.Hints;
+import org.simantics.g2d.canvas.ICanvasContext;
+import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
+import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;
+import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;
+import org.simantics.maps.sg.MapNode;
+import org.simantics.scenegraph.g2d.G2DParentNode;
+import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;
+import org.simantics.scenegraph.g2d.events.command.CommandEvent;
+import org.simantics.scenegraph.g2d.events.command.Commands;
+import org.simantics.utils.datastructures.hints.HintListenerAdapter;
+import org.simantics.utils.datastructures.hints.IHintListener;
+import org.simantics.utils.datastructures.hints.IHintObservable;
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
+
+/**
+ * MapPainter is an ICanvasContext participant that uses the scene graph
+ * {@link MapNode} to draw tiled maps in the background of the canvas.
+ * 
+ * @author J-P Laine
+ * 
+ * @see MapNode
+ */
+public class MapPainter extends AbstractCanvasParticipant {
+
+    /**
+     * Grid enabled status. Default value is True
+     */
+    public static final Key KEY_MAP_ENABLED  = new KeyOf(Boolean.class);
+
+    public static final double ZOOM_IN_LIMIT = 10000000.0;
+
+    public static final double ZOOM_OUT_LIMIT = 10.0;
+
+    IHintListener mapListener = new HintListenerAdapter() {
+        public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
+            ICanvasContext cc = getContext();
+            if (cc != null) {
+                updateNode();
+                cc.getContentContext().setDirty();
+            }
+        }
+    };
+
+    protected MapNode node = null;
+
+    private int scale;
+
+    public MapPainter(int scale) {
+        this.scale = scale;
+    }
+
+    @Override
+    public void addedToContext(ICanvasContext ctx) {
+        super.addedToContext(ctx);
+        getHintStack().addKeyHintListener(getThread(), KEY_MAP_ENABLED, mapListener);
+    }
+
+    @Override
+    public void removedFromContext(ICanvasContext ctx) {
+        getHintStack().removeKeyHintListener(getThread(), KEY_MAP_ENABLED, mapListener);
+        super.removedFromContext(ctx);
+    }
+
+    @EventHandler(priority = 0)
+    public boolean handleKeyEvent(CommandEvent e) {
+        if (e.command.equals( Commands.MAP_ENABLE )) {
+            setEnabled(true);
+            updateNode();
+            setDirty();
+            return true;
+        } else if (e.command.equals( Commands.MAP_DISABLE )) {
+            setEnabled(false);
+            updateNode();
+            setDirty();
+            return true;
+        } else if (e.command.equals( Commands.MAP_TOGGLE )) {
+            setEnabled(!isMapEnabled());
+            updateNode();
+            setDirty();
+            return true;
+        }
+        return false;
+    }
+
+    @SGInit
+    public void initSG(G2DParentNode parent) {
+        node = parent.addNode("map", MapNode.class);
+        node.setScale(scale);
+        node.setEnabled(true);
+        node.setZIndex(Integer.MIN_VALUE + 999); // Just under the grid
+    }
+
+    @SGCleanup
+    public void cleanupSG() {
+        node.remove();
+    }
+
+    protected void updateNode() {
+        node.setEnabled(isPaintingEnabled());
+    }
+
+    boolean isPaintingEnabled() {
+        boolean enabled = isMapEnabled();
+        Boolean globalDisable = getHint(Hints.KEY_DISABLE_PAINTING);
+        return enabled && !Boolean.TRUE.equals(globalDisable);
+    }
+
+    public boolean isMapEnabled() {
+        Boolean enabled = getHint(KEY_MAP_ENABLED);
+        return !Boolean.FALSE.equals(enabled);
+    }
+
+    public void setEnabled(boolean enabled) {
+        setHint(KEY_MAP_ENABLED, enabled);
+    }
+
+}