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