wordpreference.java

这是用SWT写的一个自定义编辑器的一个小离子

package edit4.preference;



import java.util.StringTokenizer;

import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;
import edit4.Edit4Plugin;

public class WordPreference
	extends PreferencePage
	implements IWorkbenchPreferencePage {

	//The list that displays the current bad words
	private List badWordList;
	//The newEntryText is the text where new bad words are specified
	private Text newEntryText;

	private static String PREFERENCE_DELIMITER = ";";

	private static String VALUE_IDENTIFIER = "=";
	private static String ENTRY_DELIMITER = ",";
	private static String KEY_DELIMITER = ";";

	//The identifiers for the preferences	
	public static final String BAD_WORDS_PREFERENCE = "badwords";
	public static final String HIGHLIGHT_PREFERENCE = "highlight";

	//The default values for the preferences
	public static final String DEFAULT_BAD_WORDS = "bug;bogus;hack;";
	public static final int DEFAULT_HIGHLIGHT = SWT.COLOR_BLUE;

	/*
	 * @see PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {

		Composite entryTable = new Composite(parent, SWT.NULL);

		//Create a data that takes up the extra space in the dialog .
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.grabExcessHorizontalSpace = true;
		entryTable.setLayoutData(data);

		GridLayout layout = new GridLayout();
		entryTable.setLayout(layout);			
				
		//Add in a dummy label for spacing
		new Label(entryTable,SWT.NONE);

		badWordList = new List(entryTable, SWT.BORDER);
		badWordList.setItems(getBadWordsPreference());

		//Create a data that takes up the extra space in the dialog and spans both columns.
		data = new GridData(GridData.FILL_BOTH);
		badWordList.setLayoutData(data);
		
		Composite buttonComposite = new Composite(entryTable,SWT.NULL);
		
		GridLayout buttonLayout = new GridLayout();
		buttonLayout.numColumns = 2;
		buttonComposite.setLayout(buttonLayout);

		//Create a data that takes up the extra space in the dialog and spans both columns.
		data = new GridData(GridData.FILL_BOTH | GridData.VERTICAL_ALIGN_BEGINNING);
		buttonComposite.setLayoutData(data);		
		
		Button addButton = new Button(buttonComposite, SWT.PUSH | SWT.CENTER);

		addButton.setText("加入到列表"); //$NON-NLS-1$
		addButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				badWordList.add(newEntryText.getText(), badWordList.getItemCount());
			}
		});
		
		newEntryText = new Text(buttonComposite, SWT.BORDER);
		//Create a data that takes up the extra space in the dialog .
		data = new GridData(GridData.FILL_HORIZONTAL);
		data.grabExcessHorizontalSpace = true;
		newEntryText.setLayoutData(data);
		
		
		Button removeButton = new Button(buttonComposite, SWT.PUSH | SWT.CENTER);

		removeButton.setText("删除选择"); //$NON-NLS-1$
		removeButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				badWordList.remove(badWordList.getSelectionIndex());
			}
		});
		
		data = new GridData();
		data.horizontalSpan = 2;
		removeButton.setLayoutData(data);
	
		return entryTable;
	}

	/*
	 * @see IWorkbenchPreferencePage#init(IWorkbench)
	 */
	public void init(IWorkbench workbench) {
		//Initialize the preference store we wish to use
		setPreferenceStore(Edit4Plugin.getDefault().getPreferenceStore());
	}

	/**
	 * Performs special processing when this page's Restore Defaults button has been pressed.
	 * Sets the contents of the nameEntry field to
	 * be the default 
	 */
	protected void performDefaults() {
		badWordList.setItems(getDefaultBadWordsPreference());
		
	}
	/** 
	 * Method declared on IPreferencePage. Save the
	 * author name to the preference store.
	 */
	public boolean performOk() {
		setBadWordsPreference(badWordList.getItems());
		return super.performOk();
	}
	public String[] getDefaultBadWordsPreference() {
		return convert(DEFAULT_BAD_WORDS
			//getPreferenceStore().getDefaultString(DEFAULT_BAD_WORDS)
				);
	}

	/**
	 * Return the bad words preference as an array of
	 * Strings.
	 * @return String[]
	 */
	public String[] getBadWordsPreference() {
		return convert(getPreferenceStore().getString(BAD_WORDS_PREFERENCE));
	}

	/**
	 * Convert the supplied PREFERENCE_DELIMITER delimited
	 * String to a String array.
	 * @return String[]
	 */
	private String[] convert(String preferenceValue) {
		StringTokenizer tokenizer =
			new StringTokenizer(preferenceValue, PREFERENCE_DELIMITER);
		int tokenCount = tokenizer.countTokens();
		String[] elements = new String[tokenCount];

		for (int i = 0; i < tokenCount; i++) {
			elements[i] = tokenizer.nextToken();
		}

		return elements;
	}

	/**
	 * Set the bad words preference
	 * @param String [] elements - the Strings to be 
	 * 	converted to the preference value
	 */
	public void setBadWordsPreference(String[] elements) {
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < elements.length; i++) {
			buffer.append(elements[i]);
			buffer.append(PREFERENCE_DELIMITER);
		}
		getPreferenceStore().setValue(BAD_WORDS_PREFERENCE, buffer.toString());
	}

	

}