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1
13
14 package org.eclipse.jface.viewers;
15
16 import org.eclipse.core.runtime.Assert;
17 import org.eclipse.swt.SWT;
18 import org.eclipse.swt.events.DisposeEvent;
19 import org.eclipse.swt.events.DisposeListener;
20 import org.eclipse.swt.graphics.Point;
21 import org.eclipse.swt.widgets.Event;
22 import org.eclipse.swt.widgets.Listener;
23
24
32 abstract class SWTFocusCellManager {
33
34 private CellNavigationStrategy navigationStrategy;
35
36 private ColumnViewer viewer;
37
38 private ViewerCell focusCell;
39
40 private FocusCellHighlighter cellHighlighter;
41
42 private DisposeListener itemDeletionListener = new DisposeListener() {
43
44 public void widgetDisposed(DisposeEvent e) {
45 setFocusCell(null);
46 }
47
48 };
49
50
55 public SWTFocusCellManager(ColumnViewer viewer,
56 FocusCellHighlighter focusDrawingDelegate,
57 CellNavigationStrategy navigationDelegate) {
58 this.viewer = viewer;
59 this.cellHighlighter = focusDrawingDelegate;
60 this.navigationStrategy = navigationDelegate;
61 hookListener(viewer);
62 }
63
64
67 void init() {
68 this.cellHighlighter.init();
69 this.navigationStrategy.init();
70 }
71
72 private void handleMouseDown(Event event) {
73 ViewerCell cell = viewer.getCell(new Point(event.x, event.y));
74 if (cell != null) {
75
76 if (!cell.equals(focusCell)) {
77 setFocusCell(cell);
78 }
79 }
80 }
81
82 private void handleKeyDown(Event event) {
83 ViewerCell tmp = null;
84
85 if (navigationStrategy.isCollapseEvent(viewer, focusCell, event)) {
86 navigationStrategy.collapse(viewer, focusCell, event);
87 } else if (navigationStrategy.isExpandEvent(viewer, focusCell, event)) {
88 navigationStrategy.expand(viewer, focusCell, event);
89 } else if (navigationStrategy.isNavigationEvent(viewer, event)) {
90 tmp = navigationStrategy.findSelectedCell(viewer, focusCell, event);
91
92 if (tmp != null) {
93 if (!tmp.equals(focusCell)) {
94 setFocusCell(tmp);
95 }
96 }
97 }
98
99 if (navigationStrategy.shouldCancelEvent(viewer, event)) {
100 event.doit = false;
101 }
102 }
103
104 private void handleSelection(Event event) {
105 if (focusCell != null && focusCell.getItem() != event.item
106 && event.item != null) {
107 ViewerRow row = viewer.getViewerRowFromItem(event.item);
108 Assert
109 .isNotNull(row,
110 "Internal Structure invalid. Row item has no row ViewerRow assigned"); ViewerCell tmp = row.getCell(focusCell.getColumnIndex());
112 if (!focusCell.equals(tmp)) {
113 setFocusCell(tmp);
114 }
115 }
116 }
117
118 private void handleFocusIn(Event event) {
119 if (focusCell == null) {
120 setFocusCell(getInitialFocusCell());
121 }
122 }
123
124 abstract ViewerCell getInitialFocusCell();
125
126 private void hookListener(ColumnViewer viewer) {
127 Listener listener = new Listener() {
128
129 public void handleEvent(Event event) {
130 switch (event.type) {
131 case SWT.MouseDown:
132 handleMouseDown(event);
133 break;
134 case SWT.KeyDown:
135 handleKeyDown(event);
136 break;
137 case SWT.Selection:
138 handleSelection(event);
139 break;
140 case SWT.FocusIn:
141 handleFocusIn(event);
142 break;
143 }
144 }
145 };
146
147 viewer.getControl().addListener(SWT.MouseDown, listener);
148 viewer.getControl().addListener(SWT.KeyDown, listener);
149 viewer.getControl().addListener(SWT.Selection, listener);
150 viewer.addSelectionChangedListener(new ISelectionChangedListener() {
151
152 public void selectionChanged(SelectionChangedEvent event) {
153 if( event.selection.isEmpty() ) {
154 setFocusCell(null);
155 }
156 }
157
158 });
159 viewer.getControl().addListener(SWT.FocusIn, listener);
160 }
161
162
166 public ViewerCell getFocusCell() {
167 return focusCell;
168 }
169
170 void setFocusCell(ViewerCell focusCell) {
171 if( this.focusCell != null && ! this.focusCell.getItem().isDisposed() ) {
172 this.focusCell.getItem().removeDisposeListener(itemDeletionListener);
173 }
174
175 this.focusCell = focusCell;
176
177 if( this.focusCell != null && ! this.focusCell.getItem().isDisposed() ) {
178 this.focusCell.getItem().addDisposeListener(itemDeletionListener);
179 }
180
181 this.cellHighlighter.focusCellChanged(focusCell);
182 }
183
184 ColumnViewer getViewer() {
185 return viewer;
186 }
187 }
188 |
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