| /******************************************************************************* |
| * Copyright (c) 2004, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.ide.dialogs; |
| |
| import java.nio.charset.Charset; |
| import java.nio.charset.IllegalCharsetNameException; |
| import java.util.List; |
| |
| import org.eclipse.jface.preference.FieldEditor; |
| import org.eclipse.jface.preference.IPreferenceStore; |
| import org.eclipse.osgi.util.NLS; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.KeyAdapter; |
| import org.eclipse.swt.events.KeyEvent; |
| import org.eclipse.swt.events.SelectionAdapter; |
| import org.eclipse.swt.events.SelectionEvent; |
| import org.eclipse.swt.graphics.Font; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.layout.GridLayout; |
| import org.eclipse.swt.widgets.Button; |
| import org.eclipse.swt.widgets.Combo; |
| import org.eclipse.swt.widgets.Composite; |
| import org.eclipse.swt.widgets.Group; |
| import org.eclipse.ui.WorkbenchEncoding; |
| import org.eclipse.ui.ide.IDEEncoding; |
| import org.eclipse.ui.internal.ide.IDEWorkbenchMessages; |
| |
| /** |
| * The abstract superclass of field editors used to set an encoding. |
| * Any user entered encodings will be added to the list of encodings available via {@link org.eclipse.ui.ide.IDEEncoding}. |
| * <p> |
| * Subclasses may extend, but must call <code>createEncodingGroup</code> during <code>doFillIntoGrid</code>. |
| * </p> |
| * |
| * @see org.eclipse.ui.ide.IDEEncoding |
| * @since 3.1 |
| */ |
| public abstract class AbstractEncodingFieldEditor extends FieldEditor { |
| |
| private Composite container; |
| |
| private Button defaultEncodingButton; |
| |
| private String defaultEnc; |
| |
| private Button otherEncodingButton; |
| |
| private Combo encodingCombo; |
| |
| private boolean isValid = true; |
| |
| private String oldSelectedEncoding; |
| |
| /** |
| * Creates a new encoding field editor with no settings set. |
| */ |
| protected AbstractEncodingFieldEditor() { |
| super(); |
| } |
| |
| /** |
| * Creates a new encoding field editor with the given preference name, label and parent. |
| * |
| * @param name the name of the preference this field editor works on |
| * @param labelText the label text of the field editor |
| * @param parent the parent of the field editor's control |
| */ |
| protected AbstractEncodingFieldEditor(String name, String labelText, Composite parent) { |
| super(name, labelText, parent); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#adjustForNumColumns(int) |
| */ |
| protected void adjustForNumColumns(int numColumns) { |
| ((GridData) getContainer().getLayoutData()).horizontalSpan = numColumns; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#doFillIntoGrid(org.eclipse.swt.widgets.Composite, int) |
| */ |
| protected void doFillIntoGrid(Composite parent, int numColumns) { |
| container = createEncodingGroup(parent, numColumns); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#doLoad() |
| */ |
| protected void doLoad() { |
| if (encodingCombo != null) { |
| List encodings = IDEEncoding.getIDEEncodings(); |
| String resourcePreference = getStoredValue(); |
| populateEncodingsCombo(encodings, resourcePreference); |
| updateEncodingState(resourcePreference == null); |
| } |
| } |
| |
| /** |
| * Returns the value that is currently stored for the encoding. |
| * |
| * @return the currently stored encoding |
| */ |
| protected abstract String getStoredValue(); |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#doLoadDefault() |
| */ |
| protected void doLoadDefault() { |
| updateEncodingState(true); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#getNumberOfControls() |
| */ |
| public int getNumberOfControls() { |
| return 1; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#isValid() |
| */ |
| public boolean isValid() { |
| return isValid; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#refreshValidState() |
| */ |
| protected void refreshValidState() { |
| updateValidState(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.preference.FieldEditor#setPreferenceStore(org.eclipse.jface.preference.IPreferenceStore) |
| */ |
| public void setPreferenceStore(IPreferenceStore store) { |
| super.setPreferenceStore(store); |
| defaultEnc = store.getDefaultString(getPreferenceName()); |
| updateDefaultEncoding(); |
| } |
| |
| private void updateDefaultEncoding() { |
| defaultEncodingButton.setText(defaultButtonText()); |
| } |
| |
| private Composite getContainer() { |
| return container; |
| } |
| |
| /** |
| * Creates a composite with all the encoding controls. |
| * <p> |
| * Subclasses may extend. |
| * </p> |
| * |
| * @param parent the parent widget |
| * @param numColumns the number of columns in the parent |
| * @return the group control |
| */ |
| protected Composite createEncodingGroup(Composite parent, int numColumns) { |
| |
| Font font = parent.getFont(); |
| Group group = new Group(parent, SWT.NONE); |
| GridData data = new GridData(GridData.FILL_HORIZONTAL); |
| group.setLayoutData(data); |
| GridLayout layout = new GridLayout(); |
| layout.numColumns = 2; |
| group.setLayout(layout); |
| group.setText(IDEWorkbenchMessages.WorkbenchPreference_encoding); |
| group.setFont(font); |
| |
| SelectionAdapter buttonListener = new SelectionAdapter() { |
| public void widgetSelected(SelectionEvent e) { |
| updateEncodingState(defaultEncodingButton.getSelection()); |
| updateValidState(); |
| } |
| }; |
| |
| defaultEncodingButton = new Button(group, SWT.RADIO); |
| defaultEnc = findDefaultEncoding(); |
| defaultEncodingButton.setText(defaultButtonText()); |
| data = new GridData(); |
| data.horizontalSpan = 2; |
| defaultEncodingButton.setLayoutData(data); |
| defaultEncodingButton.addSelectionListener(buttonListener); |
| defaultEncodingButton.setFont(font); |
| |
| otherEncodingButton = new Button(group, SWT.RADIO); |
| otherEncodingButton.setText(IDEWorkbenchMessages.WorkbenchPreference_otherEncoding); |
| otherEncodingButton.addSelectionListener(buttonListener); |
| otherEncodingButton.setFont(font); |
| |
| encodingCombo = new Combo(group, SWT.NONE); |
| data = new GridData(); |
| encodingCombo.setFont(font); |
| encodingCombo.setLayoutData(data); |
| encodingCombo.addSelectionListener(new SelectionAdapter(){ |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent) |
| */ |
| public void widgetSelected(SelectionEvent e) { |
| updateValidState(); |
| } |
| }); |
| encodingCombo.addKeyListener(new KeyAdapter(){ |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.events.KeyListener#keyReleased(org.eclipse.swt.events.KeyEvent) |
| */ |
| public void keyReleased(KeyEvent e) { |
| updateValidState(); |
| } |
| }); |
| |
| |
| return group; |
| } |
| |
| /** |
| * Returns the default encoding for the object being shown. |
| * |
| * @return the default encoding for the object being shown |
| */ |
| protected String findDefaultEncoding() { |
| return WorkbenchEncoding.getWorkbenchDefaultEncoding(); |
| } |
| |
| /** |
| * Returns the text for the default encoding button. |
| * |
| * @return the text for the default encoding button |
| */ |
| protected String defaultButtonText() { |
| return NLS.bind(IDEWorkbenchMessages.WorkbenchPreference_defaultEncoding, defaultEnc); |
| } |
| |
| /** |
| * Populates the encodings combo. Sets the text based on the |
| * selected encoding. If there is no selected encoding, the text is set to the default encoding. |
| * |
| * @param encodings the list of encodings (list of String) |
| * @param selectedEncoding the selected encoding, or <code>null</code> |
| */ |
| private void populateEncodingsCombo(List encodings, String selectedEncoding) { |
| String[] encodingStrings = new String[encodings.size()]; |
| encodings.toArray(encodingStrings); |
| encodingCombo.setItems(encodingStrings); |
| |
| if (selectedEncoding == null) |
| encodingCombo.setText(getDefaultEnc()); |
| else |
| encodingCombo.setText(selectedEncoding); |
| } |
| |
| private void updateEncodingState(boolean useDefault) { |
| defaultEncodingButton.setSelection(useDefault); |
| otherEncodingButton.setSelection(!useDefault); |
| if(useDefault) |
| encodingCombo.setText(getDefaultEnc()); |
| encodingCombo.setEnabled(!useDefault); |
| updateValidState(); |
| } |
| |
| private void updateValidState() { |
| boolean isValidNow = isEncodingValid(); |
| if (isValidNow != isValid) { |
| isValid = isValidNow; |
| if (isValid) { |
| clearErrorMessage(); |
| } else { |
| showErrorMessage(IDEWorkbenchMessages.WorkbenchPreference_unsupportedEncoding); |
| } |
| fireStateChanged(IS_VALID, !isValid, isValid); |
| |
| String newValue = getSelectedEncoding(); |
| if (isValid && !newValue.equals(oldSelectedEncoding)) { |
| fireValueChanged(VALUE, oldSelectedEncoding, newValue); |
| oldSelectedEncoding = newValue; |
| } |
| } |
| } |
| |
| /** |
| * Returns the currently selected encoding. |
| * |
| * @return the currently selected encoding |
| */ |
| protected String getSelectedEncoding() { |
| if (defaultEncodingButton.getSelection()) { |
| return defaultEnc; |
| } |
| return encodingCombo.getText(); |
| } |
| |
| private boolean isEncodingValid() { |
| return defaultEncodingButton.getSelection() || isValidEncoding(encodingCombo.getText()); |
| } |
| |
| /** |
| * Returns whether or not the given encoding is valid. |
| * |
| * @param enc the encoding to validate |
| * @return <code>true</code> if the encoding is valid, <code>false</code> otherwise |
| */ |
| private boolean isValidEncoding(String enc) { |
| try { |
| return Charset.isSupported(enc); |
| } catch (IllegalCharsetNameException e) { |
| //This is a valid exception |
| return false; |
| } |
| |
| } |
| |
| /** |
| * Returns the default encoding. |
| * |
| * @return the default encoding |
| */ |
| protected String getDefaultEnc() { |
| return defaultEnc; |
| } |
| |
| /** |
| * Returns whether or not the encoding setting changed. |
| * |
| * @param encodingSetting the setting from the page. |
| * @return boolean <code>true</code> if the resource encoding |
| * is the same as before. |
| */ |
| protected boolean hasSameEncoding(String encodingSetting) { |
| |
| String current = getStoredValue(); |
| |
| if (encodingSetting == null) { |
| //Changed if default is selected and there is no setting |
| return current == null || current.length() == 0; |
| } |
| return encodingSetting.equals(current); |
| } |
| |
| /** |
| * Return whether or not the default has been selected. |
| * @return <code>true</code> if the default button has been |
| * selected. |
| */ |
| boolean isDefaultSelected() { |
| return defaultEncodingButton.getSelection(); |
| } |
| |
| } |