Added patch for #1589521 "3 character function names invalid?"
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpeclipse / phpeditor / PaintManager.java
1 package net.sourceforge.phpeclipse.phpeditor;
2
3 /*
4  * (c) Copyright IBM Corp. 2000, 2001.
5  * All Rights Reserved.
6  */
7
8 import java.util.ArrayList;
9 import java.util.Iterator;
10 import java.util.List;
11
12 import org.eclipse.jface.text.BadLocationException;
13 import org.eclipse.jface.text.BadPositionCategoryException;
14 import org.eclipse.jface.text.DefaultPositionUpdater;
15 import org.eclipse.jface.text.IDocument;
16 import org.eclipse.jface.text.IPositionUpdater;
17 import org.eclipse.jface.text.ITextInputListener;
18 import org.eclipse.jface.text.ITextListener;
19 import org.eclipse.jface.text.Position;
20 import org.eclipse.jface.text.TextEvent;
21 import org.eclipse.jface.text.source.ISourceViewer;
22 import org.eclipse.jface.viewers.ISelectionChangedListener;
23 import org.eclipse.jface.viewers.ISelectionProvider;
24 import org.eclipse.jface.viewers.SelectionChangedEvent;
25 import org.eclipse.swt.custom.StyledText;
26 import org.eclipse.swt.events.KeyEvent;
27 import org.eclipse.swt.events.KeyListener;
28 import org.eclipse.swt.events.MouseEvent;
29 import org.eclipse.swt.events.MouseListener;
30 import org.eclipse.swt.widgets.Control;
31
32 public final class PaintManager implements KeyListener, MouseListener,
33                 ISelectionChangedListener, ITextListener, ITextInputListener {
34
35         static class PaintPositionUpdater extends DefaultPositionUpdater {
36
37                 /**
38                  * Creates the position updater.
39                  */
40                 protected PaintPositionUpdater(String category) {
41                         super(category);
42                 }
43
44                 /**
45                  * If an insertion happens at a position's offset, the position is
46                  * extended rather than shifted. Also, if something is added right
47                  * behind the end of the position, the position is extended rather than
48                  * kept stable.
49                  */
50                 protected void adaptToInsert() {
51
52                         int myStart = fPosition.offset;
53                         int myEnd = fPosition.offset + fPosition.length;
54                         myEnd = Math.max(myStart, myEnd);
55
56                         int yoursStart = fOffset;
57                         int yoursEnd = fOffset + fReplaceLength;// - 1;
58                         yoursEnd = Math.max(yoursStart, yoursEnd);
59
60                         if (myEnd < yoursStart)
61                                 return;
62
63                         if (myStart <= yoursStart)
64                                 fPosition.length += fReplaceLength;
65                         else
66                                 fPosition.offset += fReplaceLength;
67                 }
68         };
69
70         static class PositionManager implements IPositionManager {
71
72                 private IDocument fDocument;
73
74                 private IPositionUpdater fPositionUpdater;
75
76                 private String fCategory;
77
78                 public PositionManager() {
79                         fCategory = getClass().getName() + hashCode();
80                         fPositionUpdater = new PaintPositionUpdater(fCategory);
81                 }
82
83                 public void install(IDocument document) {
84                         fDocument = document;
85                         fDocument.addPositionCategory(fCategory);
86                         fDocument.addPositionUpdater(fPositionUpdater);
87                 }
88
89                 public void dispose() {
90                         uninstall(fDocument);
91                 }
92
93                 public void uninstall(IDocument document) {
94                         if (document == fDocument && document != null) {
95                                 try {
96                                         fDocument.removePositionUpdater(fPositionUpdater);
97                                         fDocument.removePositionCategory(fCategory);
98                                 } catch (BadPositionCategoryException x) {
99                                         // should not happen
100                                 }
101                                 fDocument = null;
102                         }
103                 }
104
105                 /*
106                  * @see IPositionManager#addManagedPosition(Position)
107                  */
108                 public void addManagedPosition(Position position) {
109                         try {
110                                 fDocument.addPosition(fCategory, position);
111                         } catch (BadPositionCategoryException x) {
112                                 // should not happen
113                         } catch (BadLocationException x) {
114                                 // should not happen
115                         }
116                 }
117
118                 /*
119                  * @see IPositionManager#removeManagedPosition(Position)
120                  */
121                 public void removeManagedPosition(Position position) {
122                         try {
123                                 fDocument.removePosition(fCategory, position);
124                         } catch (BadPositionCategoryException x) {
125                                 // should not happen
126                         }
127                 }
128         };
129
130         private List fPainters = new ArrayList(2);
131
132         private PositionManager fManager;
133
134         private ISourceViewer fSourceViewer;
135
136         private boolean fTextChanged = false;
137
138         private boolean fAutoRepeat = false;
139
140         public PaintManager(ISourceViewer sourceViewer) {
141                 fSourceViewer = sourceViewer;
142         }
143
144         public void addPainter(IPainter painter) {
145                 if (!fPainters.contains(painter)) {
146                         fPainters.add(painter);
147                         if (fPainters.size() == 1)
148                                 install();
149                         painter.setPositionManager(fManager);
150                         painter.paint(IPainter.INTERNAL);
151                 }
152         }
153
154         public void removePainter(IPainter painter) {
155                 if (fPainters.remove(painter))
156                         painter.setPositionManager(null);
157                 if (fPainters.size() == 0)
158                         dispose();
159         }
160
161         private void install() {
162
163                 fManager = new PositionManager();
164                 fManager.install(fSourceViewer.getDocument());
165
166                 fSourceViewer.addTextInputListener(this);
167
168                 ISelectionProvider provider = fSourceViewer.getSelectionProvider();
169                 provider.addSelectionChangedListener(this);
170
171                 fSourceViewer.addTextListener(this);
172
173                 StyledText text = fSourceViewer.getTextWidget();
174                 text.addKeyListener(this);
175                 text.addMouseListener(this);
176         }
177
178         public void dispose() {
179
180                 if (fManager != null) {
181                         fManager.dispose();
182                         fManager = null;
183                 }
184
185                 for (Iterator e = fPainters.iterator(); e.hasNext();)
186                         ((IPainter) e.next()).dispose();
187                 fPainters.clear();
188
189                 fSourceViewer.removeTextInputListener(this);
190
191                 ISelectionProvider provider = fSourceViewer.getSelectionProvider();
192                 if (provider != null)
193                         provider.removeSelectionChangedListener(this);
194
195                 fSourceViewer.removeTextListener(this);
196
197                 StyledText text = fSourceViewer.getTextWidget();
198                 if (text != null && !text.isDisposed()) {
199                         text.removeKeyListener(this);
200                         text.removeMouseListener(this);
201                 }
202         }
203
204         private void paint(int reason) {
205                 for (Iterator e = fPainters.iterator(); e.hasNext();)
206                         ((IPainter) e.next()).paint(reason);
207         }
208
209         /*
210          * @see KeyListener#keyPressed(KeyEvent)
211          */
212         public void keyPressed(KeyEvent e) {
213                 paint(IPainter.KEY_STROKE);
214         }
215
216         /*
217          * @see KeyListener#keyReleased(KeyEvent)
218          */
219         public void keyReleased(KeyEvent e) {
220         }
221
222         /*
223          * @see MouseListener#mouseDoubleClick(MouseEvent)
224          */
225         public void mouseDoubleClick(MouseEvent e) {
226         }
227
228         /*
229          * @see MouseListener#mouseDown(MouseEvent)
230          */
231         public void mouseDown(MouseEvent e) {
232                 paint(IPainter.MOUSE_BUTTON);
233         }
234
235         /*
236          * @see MouseListener#mouseUp(MouseEvent)
237          */
238         public void mouseUp(MouseEvent e) {
239         }
240
241         /*
242          * @see ISelectionChangedListener#selectionChanged(SelectionChangedEvent)
243          */
244         public void selectionChanged(SelectionChangedEvent event) {
245                 paint(IPainter.SELECTION);
246         }
247
248         /*
249          * @see ITextListener#textChanged(TextEvent)
250          */
251         public void textChanged(TextEvent event) {
252
253                 if (!event.getViewerRedrawState())
254                         return;
255
256                 fTextChanged = true;
257                 Control control = fSourceViewer.getTextWidget();
258                 if (control != null) {
259                         control.getDisplay().asyncExec(new Runnable() {
260                                 public void run() {
261                                         if (fTextChanged && fSourceViewer != null)
262                                                 paint(IPainter.TEXT_CHANGE);
263                                 }
264                         });
265                 }
266         }
267
268         /*
269          * @see ITextInputListener#inputDocumentAboutToBeChanged(IDocument,
270          *      IDocument)
271          */
272         public void inputDocumentAboutToBeChanged(IDocument oldInput,
273                         IDocument newInput) {
274                 if (oldInput != null) {
275                         for (Iterator e = fPainters.iterator(); e.hasNext();)
276                                 ((IPainter) e.next()).deactivate(false);
277                         fManager.uninstall(oldInput);
278                 }
279         }
280
281         /*
282          * @see ITextInputListener#inputDocumentChanged(IDocument, IDocument)
283          */
284         public void inputDocumentChanged(IDocument oldInput, IDocument newInput) {
285                 if (newInput != null) {
286                         fManager.install(newInput);
287                         paint(IPainter.TEXT_CHANGE);
288                 }
289         }
290 }