KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > nightlabs > editor2d > tools > LineTool


1 /**
2  * <p> Project: com.nightlabs.editor2d </p>
3  * <p> Copyright: Copyright (c) 2004 </p>
4  * <p> Company: NightLabs GmbH (Germany) </p>
5  * <p> Creation Date: 21.12.2004 </p>
6  * <p> Author: Daniel Mazurek </p>
7 **/
8 package com.nightlabs.editor2d.tools;
9
10 import org.apache.log4j.Logger;
11 import org.eclipse.draw2d.PositionConstants;
12 import org.eclipse.draw2d.geometry.Point;
13 import org.eclipse.draw2d.geometry.PrecisionRectangle;
14 import org.eclipse.draw2d.geometry.Rectangle;
15 import org.eclipse.gef.Request;
16 import org.eclipse.gef.SnapToHelper;
17 import org.eclipse.gef.requests.CreationFactory;
18 import org.eclipse.swt.SWT;
19 import org.eclipse.swt.events.KeyEvent;
20
21 import com.nightlabs.editor2d.command.CreateShapeCommand;
22 import com.nightlabs.editor2d.j2d.GeneralShape;
23 import com.nightlabs.editor2d.request.EditorCreateRequest;
24 import com.nightlabs.editor2d.request.LineCreateRequest;
25 import com.nightlabs.editor2d.util.J2DUtil;
26
27
28 public class LineTool
29 extends EditorCreationTool
30 {
31   public static final Logger LOGGER = Logger.getLogger(LineTool.class);
32   
33   public LineTool(CreationFactory factory) {
34     super(factory);
35   }
36   
37   /**
38    * Creates a {@link EditorCreateRequest} and sets this tool's factory on the request.
39    * @see org.eclipse.gef.tools.TargetingTool#createTargetRequest()
40    */
41   protected Request createTargetRequest()
42   {
43     LineCreateRequest request = new LineCreateRequest();
44     request.setFactory(getFactory());
45     return request;
46   }
47   
48   protected LineCreateRequest getLineCreateRequest()
49   {
50     return (LineCreateRequest) getTargetRequest();
51   }
52   
53   /*
54    * the Real Location of a mousePoint including ScrollOffset
55    */
56   protected Point realLocation;
57   
58   /*
59    * the Location of a mousePoint excluding ScrollOffset
60    */
61   protected Point relativeLocation;
62   
63   protected GeneralShape feedbackGeneralShape;
64   
65   protected GeneralShape creationGeneralShape;
66   
67   protected Rectangle creationBounds;
68   
69   protected boolean handleButtonDown(int button)
70   {
71     if (button == 1)
72     {
73         if (isInState(STATE_DRAG | STATE_DRAG_IN_PROGRESS))
74         {
75           realLocation = getRealLocation();
76           relativeLocation = getLocation();
77           
78           feedbackGeneralShape.lineTo(realLocation.x, realLocation.y);
79           creationGeneralShape.lineTo(relativeLocation.x, relativeLocation.y);
80           
81           creationBounds.setBounds(J2DUtil.toDraw2D(creationGeneralShape.getBounds()));
82           getLineCreateRequest().setCreationBounds(creationBounds);
83         }
84         else
85         {
86             lockTargetEditPart(getTargetEditPart());
87             // Snap only when size on drop is employed
88 helper = (SnapToHelper)getTargetEditPart().getAdapter(SnapToHelper.class);
89             
90           Point p = getRealLocation();
91           Point p2 = getLocation();
92                                     
93             feedbackGeneralShape = new GeneralShape();
94             feedbackGeneralShape.moveTo(p.x, p.y);
95             feedbackGeneralShape.lineTo(p.x+1, p.y+1);
96
97             creationGeneralShape = new GeneralShape();
98             creationGeneralShape.moveTo(p2.x, p2.y);
99             creationGeneralShape.lineTo(p2.x+1, p2.y+1);
100                         
101             creationBounds = new Rectangle(p2.x, p2.y, p2.x+1, p2.y+1);
102             
103           getLineCreateRequest().setLocation(getLocation());
104           getLineCreateRequest().setMode(EditorCreateRequest.BOUNDS_FIX_MODE);
105             getLineCreateRequest().setCreationBounds(creationBounds);
106           
107             stateTransition(STATE_INITIAL, STATE_DRAG_IN_PROGRESS);
108             setCursor(getDefaultCursor());
109         }
110     }
111     return true;
112   }
113     
114   /**
115    * Does nothing all actions are performed by handleButtonDown(int) or
116    * updateTargetRequest
117    *
118    * @see org.eclipse.gef.tools.AbstractTool#handleButtonUp(int)
119    * @see handleButtonDown(int)
120    */
121   protected boolean handleButtonUp(int button)
122   {
123     return false;
124   }
125   
126   /**
127    * Sets the location (and size if the user is performing size-on-drop) of the request.
128    * @see org.eclipse.gef.tools.TargetingTool#updateTargetRequest()
129    */
130   protected void updateTargetRequest()
131   {
132     LineCreateRequest req = (LineCreateRequest) getLineCreateRequest();
133     if (isInState(STATE_DRAG_IN_PROGRESS))
134     {
135       // TODO: Optimize bounds calc, by getting rect which is a union of
136 // of all points in the PointList and getLocation
137 // and union Rectangle can be cached until next buttonDown
138 // Rectangle bounds = J2DUtil.toDraw2D(creationGeneralShape.getBounds());
139 Rectangle bounds = creationBounds.getCopy();
140       bounds.union(getLocation());
141         
142         req.setSize(bounds.getSize());
143         req.setLocation(bounds.getLocation());
144         req.setCreationBounds(creationBounds);
145 // req.setSize(creationBounds.getSize());
146 // req.setLocation(creationBounds.getLocation());
147
148         req.getExtendedData().clear();
149         
150         updateShape(req);
151         
152         if (!getCurrentInput().isAltKeyDown() && helper != null)
153         {
154             PrecisionRectangle baseRect = new PrecisionRectangle(bounds);
155             PrecisionRectangle result = baseRect.getPreciseCopy();
156             helper.snapRectangle(req, PositionConstants.NSEW,
157                 baseRect, result);
158             req.setLocation(result.getLocation());
159             req.setSize(result.getSize());
160
161             updateShape(req);
162         }
163     } else {
164         req.setSize(null);
165         req.setLocation(getLocation());
166     }
167   }
168   
169   protected boolean handleKeyDown(KeyEvent e)
170   {
171     if (e.character == SWT.ESC) {
172         if (stateTransition(STATE_DRAG | STATE_DRAG_IN_PROGRESS, STATE_TERMINAL))
173         {
174             eraseTargetFeedback();
175             unlockTargetEditPart();
176             performCreation(1);
177         }
178         setState(STATE_TERMINAL);
179         handleFinished();
180         return true;
181     }
182     return false;
183   }
184          
185   protected void updateShape(EditorCreateRequest request)
186   {
187       Point p = getRealLocation();
188       Point p2 = getLocation();
189         
190     feedbackGeneralShape.setLastPoint(p.x, p.y);
191     creationGeneralShape.setLastPoint(p2.x, p2.y);
192     if (request.getGeneralShape() == null)
193       request.setGeneralShape(feedbackGeneralShape);
194   }
195     
196   public void performCreation(int button)
197   {
198         if (getCurrentCommand() instanceof CreateShapeCommand)
199         {
200           CreateShapeCommand command = (CreateShapeCommand) getCurrentCommand();
201 // command.setGeneralShape(creationGeneralShape);
202 GeneralShape gs = J2DUtil.removePathSegment(creationGeneralShape, creationGeneralShape.getSize()-1);
203           command.setGeneralShape(gs);
204         }
205         
206         super.performCreation(button);
207   }
208     
209   /**
210    * @see org.eclipse.gef.Tool#deactivate()
211    */
212   public void deactivate()
213   {
214     super.deactivate();
215     helper = null;
216   }
217     
218 }
219
Free Books   Free Magazines  
Popular Tags