Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.g2d / src / org / simantics / g2d / participant / CanvasBoundsParticipant.java

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/participant/CanvasBoundsParticipant.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/participant/CanvasBoundsParticipant.java
new file mode 100644 (file)
index 0000000..21ab2a5
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/participant/CanvasBoundsParticipant.java
@@ -0,0 +1,141 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 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
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.g2d.participant;\r
+\r
+import java.awt.Rectangle;\r
+import java.awt.Shape;\r
+import java.awt.geom.AffineTransform;\r
+import java.awt.geom.Rectangle2D;\r
+\r
+import org.simantics.g2d.canvas.Hints;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.canvas.SGDesignation;\r
+import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;\r
+import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
+import org.simantics.g2d.canvas.impl.HintReflection.HintListener;\r
+import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;\r
+import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;\r
+import org.simantics.g2d.utils.GeometryUtils;\r
+import org.simantics.scenegraph.g2d.G2DParentNode;\r
+import org.simantics.scenegraph.g2d.nodes.BoundsNode;\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 canvas participant that stores the current control and canvas boundaries\r
+ * and detects their changes.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class CanvasBoundsParticipant extends AbstractCanvasParticipant {\r
+\r
+    BoundsNode.ResizeListener resizeListener = new BoundsNode.ResizeListener() {\r
+        @Override\r
+        public void controlResized(Rectangle2D bounds) {\r
+            controlBoundsUpdated(bounds);\r
+        }\r
+    };\r
+\r
+    @Dependency\r
+    private TransformUtil   util;\r
+\r
+    private BoundsNode        boundsNode     = null;\r
+\r
+    private Rectangle2D       controlBounds  = new Rectangle2D.Double();\r
+\r
+    private Rectangle2D       canvasBounds   = new Rectangle2D.Double();\r
+\r
+    @HintListener(Class=Hints.class, Field="KEY_CANVAS_TRANSFORM")\r
+    public void selectionChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {\r
+        // Update canvas bounds whenever canvas transform changes.\r
+        AffineTransform inv = util.getInverseTransform((AffineTransform) newValue);\r
+        if (inv != null) {\r
+            canvasTransformUpdated(controlBounds, inv);\r
+        } else {\r
+            // TODO: what should be done here? Leave canvas bounds as they are or mark them invalid somehow ??\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void addedToContext(ICanvasContext ctx) {\r
+        super.addedToContext(ctx);\r
+        IHintContext hctx = ctx.getDefaultHintContext();\r
+        hctx.setHint(Hints.KEY_CONTROL_BOUNDS, controlBounds);\r
+        hctx.setHint(Hints.KEY_CANVAS_BOUNDS, canvasBounds);\r
+    }\r
+\r
+    @SGInit(designation = SGDesignation.CONTROL)\r
+    public void initSG(G2DParentNode parent) {\r
+        boundsNode = parent.addNode("canvasBounds", BoundsNode.class);\r
+        boundsNode.setZIndex(Integer.MIN_VALUE);\r
+        boundsNode.setResizeListener(resizeListener);\r
+    }\r
+\r
+    @SGCleanup\r
+    public void cleanupSG() {\r
+        if (boundsNode != null) {\r
+            boundsNode.setResizeListener(null);\r
+            boundsNode.remove();\r
+            boundsNode = null;\r
+        }\r
+    }\r
+\r
+    private void controlBoundsUpdated(Rectangle2D bounds) {\r
+        if (!controlBounds.equals(bounds)) {\r
+            setControlBounds(bounds.getBounds());\r
+        }\r
+        AffineTransform invTr = util.getInverseTransform();\r
+        if (invTr != null)\r
+            canvasTransformUpdated(controlBounds, invTr);\r
+    }\r
+\r
+    private void canvasTransformUpdated(Rectangle2D controlBounds, AffineTransform inverseViewTr) {\r
+        Shape shape = GeometryUtils.transformShape(controlBounds, inverseViewTr);\r
+        Rectangle2D visibleCanvasBounds = shape.getBounds2D();\r
+        if (!canvasBounds.equals(visibleCanvasBounds)) {\r
+            setCanvasBounds(visibleCanvasBounds);\r
+        }\r
+    }\r
+\r
+    private void setControlBounds(Rectangle bounds) {\r
+        //System.out.println("Set control bounds: " + bounds);\r
+        this.controlBounds = bounds;\r
+        IHintContext ctx = getContext().getDefaultHintContext();\r
+        ctx.setHint(Hints.KEY_CONTROL_BOUNDS, controlBounds);\r
+    }\r
+\r
+    private void setCanvasBounds(Rectangle2D bounds) {\r
+        //System.out.println("Set canvas bounds: " + bounds);\r
+        this.canvasBounds = bounds;\r
+        IHintContext ctx = getContext().getDefaultHintContext();\r
+        ctx.setHint(Hints.KEY_CANVAS_BOUNDS, canvasBounds);\r
+    }\r
+\r
+    /**\r
+     * @return control bounds. Returns internal state, do not modify.\r
+     *         If the current rendering surface is pixel based, the returned\r
+     *         {@link Rectangle2D} may also be a {@link Rectangle}.\r
+     */\r
+    public Rectangle2D getControlBounds() {\r
+        return controlBounds;\r
+    }\r
+\r
+    /**\r
+     * @return visible canvas area bounds in canvas space coordinates. Returns\r
+     *         internal state, do not modify.\r
+     */\r
+    public Rectangle2D getCanvasBounds() {\r
+        return canvasBounds;\r
+    }\r
+\r
+}\r