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31
32 package org.antlr.xjlib.appkit.gview.event;
33
34 import org.antlr.xjlib.appkit.gview.GView;
35 import org.antlr.xjlib.appkit.gview.base.Anchor2D;
36 import org.antlr.xjlib.appkit.gview.base.Vector2D;
37 import org.antlr.xjlib.appkit.gview.object.GElement;
38 import org.antlr.xjlib.appkit.gview.object.GLink;
39 import org.antlr.xjlib.appkit.gview.shape.SLink;
40 import org.antlr.xjlib.appkit.gview.shape.SLinkArc;
41 import org.antlr.xjlib.appkit.gview.shape.SLinkElbow;
42
43 import java.awt.*;
44 import java.awt.event.InputEvent  ;
45 import java.awt.event.MouseEvent ;
46
47 public class GEventCreateLinkElement extends GAbstractEvent {
48
49 public GElement startElement = null;
50 public String startAnchorKey = null;
51 public SLink linkElement = null;
52 public SLinkArc linkArc = null;
53 public SLinkElbow linkElbow = null;
54
55 public GEventCreateLinkElement(GView view) {
56 super(view);
57 }
58
59 public void mousePressed(MouseEvent e, Point mousePosition) {
60 GElement selectedElement = delegate.eventQueryElementAtPoint(mousePosition);
61
62 if(startElement != null) {
63 if(selectedElement != null) {
64 int type;
65 if(linkElement instanceof SLinkElbow)
66 type = GLink.SHAPE_ELBOW;
67 else
68 type = GLink.SHAPE_ARC;
69
70 delegate.eventCreateLink(startElement, startAnchorKey,
71 selectedElement, selectedElement.getAnchorKeyClosestToPoint(mousePosition),
72 type, mousePosition);
73 }
74 removeExclusiveValue(GEventManager.EXCLUSIVE_CREATE_LINK_VALUE);
75 startElement = null;
76 linkElement = null;
77 delegate.eventShouldRepaint();
78 return;
79 }
80
81 if(selectedElement == null || !selectedElement.acceptOutgoingLink()) {
82 return;
83 }
84
85 int mask = InputEvent.SHIFT_DOWN_MASK + InputEvent.BUTTON1_DOWN_MASK;
86 if((e.getModifiersEx() & mask) == mask || delegate.eventCanCreateLink()) {
87 startElement = selectedElement;
88 startAnchorKey = startElement.getAnchorKeyClosestToPoint(mousePosition);
89
90 linkArc = new SLinkArc();
91 linkArc.setStartTangentOffset(startElement.getDefaultAnchorOffset(startAnchorKey));
92
93 linkElbow = new SLinkElbow();
94
95 if(view.defaultLinkShape() == GLink.SHAPE_ARC)
96 linkElement = linkArc;
97 else
98 linkElement = linkElbow;
99
100 linkElement.setFlateness(delegate.eventLinkFlateness());
101 addExclusiveValue(GEventManager.EXCLUSIVE_CREATE_LINK_VALUE);
102 }
103 }
104
105 public void mouseMoved(MouseEvent e, Point mousePosition) {
106 if(startElement == null)
107 return;
108
109 updateLink(mousePosition);
110 delegate.eventShouldRepaint();
111 }
112
113 public boolean shouldFocusOnElement(GElement element) {
114 if(startElement == null)
115 return true;
116 else
117 return element.acceptIncomingLink();
118 }
119
120 public void updateLink(Point mouse) {
121 GElement ce = delegate.eventQueryElementAtPoint(mouse);
122
123 boolean selfLoop = ce == startElement;
124 setLinkStartAnchor(startElement.getAnchor(startAnchorKey));
125
126 if(ce == null || ce instanceof GLink) {
127 setLinkEnd(Vector2D.vector(mouse), Anchor2D.DIRECTION_BOTTOM);
128 } else {
129 Anchor2D anchor = ce.getAnchorClosestToPoint(mouse);
130 String anchorKey = ce.getAnchorKeyClosestToPoint(mouse);
131 setLinkEnd(anchor.position, anchor.direction);
132
133 if(selfLoop) {
134 if(anchor.direction == Anchor2D.DIRECTION_FREE)
135 linkArc.setMouse(mouse);
136 else
137 linkArc.setMouse(anchor.position.add(anchor.direction));
138 linkArc.setEndTangentOffset(startElement.getDefaultAnchorOffset(anchorKey));
139 } else {
140 linkArc.setMouse(mouse);
141 linkArc.setEndTangentOffset(ce.getDefaultAnchorOffset(anchorKey));
142 }
143
144 if(selfLoop && view.defaultLinkShape() == GLink.SHAPE_ELBOW
145 && startElement.getAnchor(startAnchorKey).equals(anchor))
146 {
147 linkElement = linkArc;
148 } else if(view.defaultLinkShape() == GLink.SHAPE_ELBOW)
149 linkElement = linkElbow;
150 else if(view.defaultLinkShape() == GLink.SHAPE_ARC)
151 linkElement = linkArc;
152 }
153 setLinkSelfLoop(selfLoop);
154
155 linkElement.update();
156 }
157
158 private void setLinkSelfLoop(boolean selfLoop) {
159 linkArc.setSelfLoop(selfLoop);
160 linkElbow.setSelfLoop(selfLoop);
161 }
162
163 private void setLinkStartAnchor(Anchor2D anchor) {
164 linkArc.setStartAnchor(anchor);
165 linkElbow.setStartAnchor(anchor);
166 }
167
168 private void setLinkEnd(Vector2D position, Vector2D direction) {
169 linkArc.setEnd(position);
170 linkArc.setEndDirection(direction);
171
172 linkElbow.setEnd(position);
173 linkElbow.setEndDirection(direction);
174 }
175
176 public void draw(Graphics g) {
177 if(linkElement == null)
178 return;
179
180 linkElement.draw((Graphics2D)g);
181 }
182 }
183 |
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