pagelistconfig.java

J2EE eclipse 下开发数据库一个插件

package com.tanghan.plugin.dbviews.extend;

import java.util.ResourceBundle;

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

import com.tanghan.plugin.TanghanPlugin;
import com.tanghan.plugin.ITanghanConstants;
/**
 * 配置类
 * @author Jerry Tang
 * @see PreferencePage
 */
public class PageListConfig extends PreferencePage implements IWorkbenchPreferencePage {
	/**资源文件*/
	private static ResourceBundle res = TanghanPlugin.getDefault().getResourceBundle();
		
	private Button showAllButton ;	
	
	private Text pageListText;
	/**
	 * TO DO: Implement the "PageListConfig" constructor.
	 */
	public PageListConfig() {
	}

	/**
	 * TO DO: Implement "init".
	 * @see PreferencePage#init
	 */
	public void init(IWorkbench workbench)  {
	}

	/**
	 * TO DO: Implement "createContents".
	 * @see PreferencePage#createContents
	 */
	protected Control createContents(Composite parent)  {
		Composite composite_textField = createComposite(parent, 2);
		createLabel(composite_textField, res.getString("Config.PageList.ShowAll"));	 
		showAllButton = createCheckBox(composite_textField,""); 
		createLabel(composite_textField, res.getString("Config.PageList.List"));	 
		pageListText = createTextField(composite_textField,50);
		addListener();
		
		initializeValues();
		
		return new Composite(parent, SWT.NULL);
	}
	/**添加事件处理*/
	private void addListener(){
		showAllButton.addSelectionListener(
			new SelectionAdapter(){
				public void widgetSelected(SelectionEvent e){
					if(showAllButton.getSelection()){
						pageListText.setEnabled(false);
					}else{
						pageListText.setEnabled(true);
					}
				}
			}
		);
	}
	
	
	/**
	 * Creates composite control and sets the default layout data.
	 *
	 * @param parent  the parent of the new composite
	 * @param numColumns  the number of columns for the new composite
	 * @return the newly-created coposite
	 */
	private Composite createComposite(Composite parent, int numColumns) {
		Composite composite = new Composite(parent, SWT.NULL);

		//GridLayout
		GridLayout layout = new GridLayout();
		layout.numColumns = numColumns;
		composite.setLayout(layout);

		//GridData
		GridData data = new GridData();
		data.verticalAlignment = GridData.FILL;
		data.horizontalAlignment = GridData.FILL;
		composite.setLayoutData(data);
		return composite;
	}
	
	/**
	 * Utility method that creates a label instance
	 * and sets the default layout data.
	 *
	 * @param parent  the parent for the new label
	 * @param text  the text for the new label
	 * @return the new label
	 */
	private Label createLabel(Composite parent, String text) {
		Label label = new Label(parent, SWT.LEFT);
		label.setText(text);
		GridData data = new GridData();
		//data.horizontalSpan = 2;
		data.horizontalAlignment = GridData.FILL;
		label.setLayoutData(data);
		return label;
	}
	/**
	 * Create a text field specific for this application
	 *
	 * @param parent  the parent of the new text field
	 * @return the new text field
	 */
	private Text createTextField(Composite parent,int size) {
		Text text = new Text(parent, SWT.SINGLE | SWT.BORDER);
//		text.addModifyListener(this);
		GridData data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		//data.grabExcessHorizontalSpace = true;
		data.verticalAlignment = GridData.CENTER;
		data.grabExcessVerticalSpace = false;
		data.widthHint = size;
		text.setLayoutData(data);
		return text;
	}	
	/**
	 * Creates an new checkbox instance and sets the default
	 * layout data.
	 *
	 * @param group  the composite in which to create the checkbox
	 * @param label  the string to set into the checkbox
	 * @return the new checkbox
	 */ 
	private Button createCheckBox(Composite group, String label) {
		Button button = new Button(group, SWT.CHECK | SWT.LEFT);
		button.setText(label);
		GridData data = new GridData();
		button.setLayoutData(data);
		return button;
	}
	/**
	 * Initializes states of the controls from the preference store.
	 */
	private void initializeValues() {
		IPreferenceStore store = getPreferenceStore();
		showAllButton.setSelection(store.getBoolean(ITanghanConstants.PAGELIST_SHOWALL));
		pageListText.setText(store.getString(ITanghanConstants.PAGELIST_LIST));
		if(showAllButton.getSelection()){
			pageListText.setEnabled(false);
		}else{
			pageListText.setEnabled(true);
		}	
	}	
	/**
	 * Stores the values of the controls back to the preference store.
	 */
	private void storeValues() {
		IPreferenceStore store = getPreferenceStore();

		store.setValue(ITanghanConstants.PAGELIST_SHOWALL, showAllButton.getSelection());
		store.setValue(ITanghanConstants.PAGELIST_LIST, pageListText.getText());

	}	
	/* (non-Javadoc)
	 * Method declared on PreferencePage
	 */
	protected void performDefaults() {
		super.performDefaults();
		initializeValues();
	}	
	/* (non-Javadoc)
	 * Method declared on PreferencePage
	 */
	public boolean performOk() {
		storeValues();
		TanghanPlugin.getDefault().savePluginPreferences();
		return true;
	}	
	/** 
	 * The <code>ReadmePreferencePage</code> implementation of this
	 * <code>PreferencePage</code> method 
	 * returns preference store that belongs to the our plugin.
	 * This is important because we want to store
	 * our preferences separately from the desktop.
	 */
	protected IPreferenceStore doGetPreferenceStore() {
		return TanghanPlugin.getDefault().getPreferenceStore();
	}	
}