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1
12 package org.eclipse.ui.ide.dialogs;
13
14 import java.nio.charset.Charset  ;
15 import java.nio.charset.IllegalCharsetNameException ;
16 import java.util.List ;
17
18 import org.eclipse.jface.preference.FieldEditor;
19 import org.eclipse.jface.preference.IPreferenceStore;
20 import org.eclipse.osgi.util.NLS;
21 import org.eclipse.swt.SWT;
22 import org.eclipse.swt.events.KeyAdapter;
23 import org.eclipse.swt.events.KeyEvent;
24 import org.eclipse.swt.events.SelectionAdapter;
25 import org.eclipse.swt.events.SelectionEvent;
26 import org.eclipse.swt.layout.GridData;
27 import org.eclipse.swt.layout.GridLayout;
28 import org.eclipse.swt.widgets.Button;
29 import org.eclipse.swt.widgets.Combo;
30 import org.eclipse.swt.widgets.Composite;
31 import org.eclipse.swt.widgets.Group;
32 import org.eclipse.ui.WorkbenchEncoding;
33 import org.eclipse.ui.ide.IDEEncoding;
34 import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
35
36
48 public abstract class AbstractEncodingFieldEditor extends FieldEditor {
49
50 private Composite container;
51
52 private Button defaultEncodingButton;
53
54 private String defaultEnc;
55
56 private Button otherEncodingButton;
57
58 private Combo encodingCombo;
59
60 private boolean isValid = true;
61
62 private String oldSelectedEncoding;
63
64 private String groupTitle = IDEWorkbenchMessages.WorkbenchPreference_encoding;
65
66
69 protected AbstractEncodingFieldEditor() {
70 super();
71 }
72
73
84 protected AbstractEncodingFieldEditor(String name, String labelText,
85 Composite parent) {
86 super(name, labelText, parent);
87 }
88
89
106 protected AbstractEncodingFieldEditor(String name, String labelText,
107 String groupTitle, Composite parent) {
108 init(name, labelText);
109 this.groupTitle = groupTitle;
110 createControl(parent);
111 }
112
113
118 protected void adjustForNumColumns(int numColumns) {
119 ((GridData) getContainer().getLayoutData()).horizontalSpan = numColumns;
120 }
121
122
128 protected void doFillIntoGrid(Composite parent, int numColumns) {
129 container = createEncodingGroup(parent, numColumns);
130 }
131
132
137 protected void doLoad() {
138 if (encodingCombo != null) {
139 List encodings = IDEEncoding.getIDEEncodings();
140 String resourcePreference = getStoredValue();
141 populateEncodingsCombo(encodings, resourcePreference);
142 updateEncodingState(resourcePreference == null);
143 }
144 }
145
146
151 protected abstract String getStoredValue();
152
153
158 protected void doLoadDefault() {
159 updateEncodingState(true);
160 }
161
162
167 public int getNumberOfControls() {
168 return 1;
169 }
170
171
176 public boolean isValid() {
177 return isValid;
178 }
179
180
185 protected void refreshValidState() {
186 updateValidState();
187 }
188
189
194 public void setPreferenceStore(IPreferenceStore store) {
195 super.setPreferenceStore(store);
196 defaultEnc = store.getDefaultString(getPreferenceName());
197 updateDefaultEncoding();
198 }
199
200 private void updateDefaultEncoding() {
201 defaultEncodingButton.setText(defaultButtonText());
202 }
203
204 private Composite getContainer() {
205 return container;
206 }
207
208
220 protected Composite createEncodingGroup(Composite parent, int numColumns) {
221
222 Composite topControl;
223 GridLayout layout = new GridLayout();
224 layout.numColumns = 2;
225
226 if (groupTitle == null){
227 topControl = new Composite(parent, SWT.NONE);
228 layout.marginWidth = 0;
229 layout.marginHeight = 0;
230 }
231 else {
232 Group top = new Group(parent, SWT.NONE);
233 top.setText(groupTitle);
234 topControl = top;
235 }
236
237 GridData data = new GridData(GridData.FILL_HORIZONTAL);
238 topControl.setLayoutData(data);
239 topControl.setLayout(layout);
240
241 SelectionAdapter buttonListener = new SelectionAdapter() {
242 public void widgetSelected(SelectionEvent e) {
243 updateEncodingState(defaultEncodingButton.getSelection());
244 updateValidState();
245 }
246 };
247
248 defaultEncodingButton = new Button(topControl, SWT.RADIO);
249 defaultEnc = findDefaultEncoding();
250 defaultEncodingButton.setText(defaultButtonText());
251 data = new GridData();
252 data.horizontalSpan = 2;
253 defaultEncodingButton.setLayoutData(data);
254 defaultEncodingButton.addSelectionListener(buttonListener);
255
256 otherEncodingButton = new Button(topControl, SWT.RADIO);
257 otherEncodingButton
258 .setText(IDEWorkbenchMessages.WorkbenchPreference_otherEncoding);
259 otherEncodingButton.addSelectionListener(buttonListener);
260
261 encodingCombo = new Combo(topControl, SWT.NONE);
262 data = new GridData();
263 encodingCombo.setLayoutData(data);
264 encodingCombo.addSelectionListener(new SelectionAdapter() {
265
270 public void widgetSelected(SelectionEvent e) {
271 updateValidState();
272 }
273 });
274 encodingCombo.addKeyListener(new KeyAdapter() {
275
280 public void keyReleased(KeyEvent e) {
281 updateValidState();
282 }
283 });
284
285 return topControl;
286 }
287
288
295 public void setEnabled(boolean enabled, Composite parent) {
296 if (container != null)
297 container.setEnabled(enabled);
298 if (defaultEncodingButton != null)
299 defaultEncodingButton.setEnabled(enabled);
300 if (otherEncodingButton != null)
301 otherEncodingButton.setEnabled(enabled);
302 if (encodingCombo != null)
303 encodingCombo.setEnabled(enabled);
304
305 }
306
307
312 protected String findDefaultEncoding() {
313 return WorkbenchEncoding.getWorkbenchDefaultEncoding();
314 }
315
316
321 protected String defaultButtonText() {
322 return NLS.bind(
323 IDEWorkbenchMessages.WorkbenchPreference_defaultEncoding,
324 defaultEnc);
325 }
326
327
337 private void populateEncodingsCombo(List encodings, String selectedEncoding) {
338 String [] encodingStrings = new String [encodings.size()];
339 encodings.toArray(encodingStrings);
340 encodingCombo.setItems(encodingStrings);
341
342 if (selectedEncoding == null) {
343 encodingCombo.setText(getDefaultEnc());
344 } else {
345 encodingCombo.setText(selectedEncoding);
346 }
347 }
348
349 private void updateEncodingState(boolean useDefault) {
350 defaultEncodingButton.setSelection(useDefault);
351 otherEncodingButton.setSelection(!useDefault);
352 if (useDefault) {
353 encodingCombo.setText(getDefaultEnc());
354 }
355 encodingCombo.setEnabled(!useDefault);
356 setPresentsDefaultValue(useDefault);
357 updateValidState();
358 }
359
360 private void updateValidState() {
361 boolean isValidNow = isEncodingValid();
362 if (isValidNow != isValid) {
363 isValid = isValidNow;
364 if (isValid) {
365 clearErrorMessage();
366 } else {
367 showErrorMessage(IDEWorkbenchMessages.WorkbenchPreference_unsupportedEncoding);
368 }
369 fireStateChanged(IS_VALID, !isValid, isValid);
370 }
371 String newValue = getSelectedEncoding();
372 if (isValid && !newValue.equals(oldSelectedEncoding)) {
373 fireValueChanged(VALUE, oldSelectedEncoding, newValue);
374 oldSelectedEncoding = newValue;
375 }
376 }
377
378
383 protected String getSelectedEncoding() {
384 if (defaultEncodingButton.getSelection()) {
385 return defaultEnc;
386 }
387 return encodingCombo.getText();
388 }
389
390 private boolean isEncodingValid() {
391 return defaultEncodingButton.getSelection()
392 || isValidEncoding(encodingCombo.getText());
393 }
394
395
403 private boolean isValidEncoding(String enc) {
404 try {
405 return Charset.isSupported(enc);
406 } catch (IllegalCharsetNameException e) {
407 return false;
409 }
410
411 }
412
413
418 protected String getDefaultEnc() {
419 return defaultEnc;
420 }
421
422
430 protected boolean hasSameEncoding(String encodingSetting) {
431
432 String current = getStoredValue();
433
434 if (encodingSetting == null) {
435 return current == null || current.length() == 0;
437 }
438 return encodingSetting.equals(current);
439 }
440
441
446 boolean isDefaultSelected() {
447 return defaultEncodingButton.getSelection();
448 }
449
450
462 public void setGroupTitle(String groupTitle) {
463 this.groupTitle = groupTitle;
464 }
465
466 }
467 |
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