bundles/org.simantics.g2d/src/org/simantics/g2d/participant/ZoomToAreaHandler.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.g2d.participant;\r
  13 \r
  14 import java.awt.BasicStroke;\r
  15 import java.awt.Color;\r
  16 import java.awt.Cursor;\r
  17 import java.awt.Shape;\r
  18 import java.awt.geom.Path2D;\r
  19 import java.awt.geom.Point2D;\r
  20 import java.awt.geom.Rectangle2D;\r
  21 \r
  22 import org.simantics.g2d.canvas.ICanvasContext;\r
  23 import org.simantics.g2d.canvas.IMouseCursorContext;\r
  24 import org.simantics.g2d.canvas.IMouseCursorHandle;\r
  25 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;\r
  26 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
  27 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;\r
  28 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;\r
  29 import org.simantics.g2d.diagram.DiagramHints;\r
  30 import org.simantics.g2d.diagram.handler.PickContext;\r
  31 import org.simantics.g2d.diagram.participant.Selection;\r
  32 import org.simantics.g2d.diagram.participant.pointertool.AbstractMode;\r
  33 import org.simantics.g2d.participant.MouseUtil.MouseInfo;\r
  34 import org.simantics.scenegraph.g2d.G2DParentNode;\r
  35 import org.simantics.scenegraph.g2d.events.Event;\r
  36 import org.simantics.scenegraph.g2d.events.MouseEvent;\r
  37 import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;\r
  38 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseButtonEvent;\r
  39 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseClickEvent;\r
  40 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseMovedEvent;\r
  41 import org.simantics.scenegraph.g2d.events.command.CommandEvent;\r
  42 import org.simantics.scenegraph.g2d.events.command.Commands;\r
  43 import org.simantics.scenegraph.g2d.nodes.ShapeNode;\r
  44 import org.simantics.utils.ObjectUtils;\r
  45 import org.simantics.utils.page.MarginUtils;\r
  46 \r
  47 /**\r
  48  * ZoomToAreaHandler starts an area zoom mode when a ZOOM_TO_AREA command is\r
  49  * issued.\r
  50  *\r
  51  * @author Tuukka Lehtonen\r
  52  */\r
  53 public class ZoomToAreaHandler extends AbstractCanvasParticipant {\r
  54 \r
  55     public final static Cursor ZOOM_CURSOR = new Cursor(Cursor.CROSSHAIR_CURSOR);\r
  56 \r
  57     @EventHandler(priority = 0)\r
  58     public boolean handleZoomToArea(CommandEvent event) {\r
  59         if (Commands.ZOOM_TO_AREA.equals( event.command )) {\r
  60             if (!getContext().containsItemByClass(ZoomToAreaMode.class)) {\r
  61                 getContext().add( new ZoomToAreaMode() );\r
  62                 setDirty();\r
  63             }\r
  64             return true;\r
  65         }\r
  66         return false;\r
  67     }\r
  68 \r
  69     class ZoomToAreaMode extends AbstractMode {\r
  70 \r
  71         @Dependency TransformUtil util;\r
  72         @Dependency Selection selection;\r
  73         @Dependency PickContext pickContext;\r
  74         @Dependency KeyUtil keyUtil;\r
  75         @Dependency MouseUtil mouseUtil;\r
  76         @Dependency CanvasBoundsParticipant canvasBounds;\r
  77 \r
  78         public final BasicStroke STROKE = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 10f, new float[] {4,2}, 0);\r
  79 \r
  80         public static final int PAINT_PRIORITY = 30;\r
  81 \r
  82         Point2D startingPoint;\r
  83         Point2D currentPoint;\r
  84         IMouseCursorHandle cursor;\r
  85 \r
  86         public ZoomToAreaMode() {\r
  87             super(0);\r
  88         }\r
  89 \r
  90         @Override\r
  91         public void addedToContext(ICanvasContext ctx) {\r
  92             super.addedToContext(ctx);\r
  93             IMouseCursorContext mctx = getContext().getMouseCursorContext();\r
  94             if (mctx != null)\r
  95                 cursor = mctx.setCursor(getMouseId(), ZOOM_CURSOR);\r
  96             MouseInfo mi = mouseUtil.getMouseInfo(getMouseId());\r
  97             if (mi != null)\r
  98                 currentPoint = mi.canvasPosition;\r
  99         }\r
 100 \r
 101         @Override\r
 102         public void removedFromContext(ICanvasContext ctx) {\r
 103             if (cursor != null) {\r
 104                 cursor.remove();\r
 105                 cursor = null;\r
 106             }\r
 107             super.removedFromContext(ctx);\r
 108         }\r
 109 \r
 110         @EventHandler(priority = 10)\r
 111         public boolean handleEvent(Event e) {\r
 112             if (e instanceof CommandEvent) {\r
 113                 CommandEvent ce = (CommandEvent) e;\r
 114                 if (ce.command.equals( Commands.CANCEL )){\r
 115                     setDirty();\r
 116                     remove();\r
 117                     return true;\r
 118                 }\r
 119             } else if (e instanceof MouseMovedEvent) {\r
 120                 MouseMovedEvent event = (MouseMovedEvent) e;\r
 121                 if (event.mouseId != getMouseId()) return false;\r
 122                 Point2D canvasPos = util.controlToCanvas(event.controlPosition, null);\r
 123                 if (!ObjectUtils.objectEquals(currentPoint, canvasPos))\r
 124                 {\r
 125                     currentPoint = canvasPos;\r
 126                     update(getBox());\r
 127                     setDirty();\r
 128                 }\r
 129                 return false;\r
 130             } else if (e instanceof MouseButtonEvent) {\r
 131                 MouseButtonEvent event = (MouseButtonEvent) e;\r
 132 \r
 133                 if (event.mouseId != getMouseId()) return false;\r
 134                 if (event.button != MouseEvent.LEFT_BUTTON) return false;\r
 135 \r
 136                 // Eat all other mouse button events besides press and click.\r
 137                 // Must use mouse clicks here because otherwise selection\r
 138                 // participants etc. might alter selections on the next incoming\r
 139                 // mouse click event, which only confuses the user.\r
 140                 if (e instanceof MouseClickEvent) {\r
 141                     Point2D canvasPos = util.controlToCanvas(event.controlPosition, null);\r
 142                     currentPoint = canvasPos;\r
 143 \r
 144                     if (startingPoint == null) {\r
 145                         // Start marking the box\r
 146                         startingPoint = currentPoint;\r
 147                         setDirty();\r
 148                         return true;\r
 149                     }\r
 150 \r
 151                     Rectangle2D area = new Rectangle2D.Double();\r
 152                     area.setFrameFromDiagonal(startingPoint, currentPoint);\r
 153 \r
 154                     Rectangle2D controlArea = canvasBounds.getControlBounds();\r
 155                     util.fitArea(controlArea, area, PanZoomRotateHandler.getZoomToFitMargins(getHintStack()));\r
 156 \r
 157                     setDirty();\r
 158                     remove();\r
 159                     return true;\r
 160                 }\r
 161                 return true;\r
 162             }\r
 163             return false;\r
 164         }\r
 165 \r
 166         /**\r
 167          * Get selection box in control coordinates\r
 168          * @return control coordinates\r
 169          */\r
 170         protected Rectangle2D getBox() {\r
 171             if (startingPoint == null)\r
 172                 return null;\r
 173             Point2D p1 = startingPoint;\r
 174             Point2D p2 = currentPoint;\r
 175             double ax = p1.getX();\r
 176             double ay = p1.getY();\r
 177             double bx = p2.getX();\r
 178             double by = p2.getY();\r
 179             if (bx < ax) {\r
 180                 double temp = ax;\r
 181                 ax = bx;\r
 182                 bx = temp;\r
 183             }\r
 184             if (by < ay) {\r
 185                 double temp = ay;\r
 186                 ay = by;\r
 187                 by = temp;\r
 188             }\r
 189             return new Rectangle2D.Double(ax, ay, bx - ax, by - ay);\r
 190         }\r
 191 \r
 192         protected Path2D getCrossHair(Rectangle2D controlBounds) {\r
 193             Point2D controlPos = util.canvasToControl(currentPoint, null);\r
 194             Path2D path = new Path2D.Double();\r
 195             path.moveTo(controlBounds.getMinX(), controlPos.getY());\r
 196             path.lineTo(controlBounds.getMaxX(), controlPos.getY());\r
 197             path.moveTo(controlPos.getX(), controlBounds.getMinY());\r
 198             path.lineTo(controlPos.getX(), controlBounds.getMaxY());\r
 199             return path;\r
 200         }\r
 201 \r
 202         public synchronized Color getToolColor()\r
 203         {\r
 204             Color c = getHint(DiagramHints.KEY_SELECTION_FRAME_COLOR);\r
 205             if (c!=null) return c;\r
 206             return Color.BLACK;\r
 207         }\r
 208 \r
 209         protected ShapeNode node = null;\r
 210 \r
 211         @SGInit\r
 212         public void initSG(G2DParentNode parent) {\r
 213             node = parent.addNode("zoom to area", ShapeNode.class);\r
 214             node.setZIndex(PAINT_PRIORITY);\r
 215             node.setStroke(STROKE);\r
 216             node.setScaleStroke(true);\r
 217             node.setColor(getToolColor());\r
 218             node.setFill(false);\r
 219         }\r
 220 \r
 221         void update(Shape shape) {\r
 222             if (node != null) {\r
 223                 node.setShape(shape);\r
 224             }\r
 225         }\r
 226 \r
 227         @SGCleanup\r
 228         public void cleanupSG() {\r
 229             if (node != null) {\r
 230                 node.remove();\r
 231                 node = null;\r
 232             }\r
 233         }\r
 234     }\r
 235 \r
 236 }\r