Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2004 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * glongman@gmail.com - fussed for Spindle *******************************************************************************/ package com.iw.plugins.spindle.ui.preferences; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.text.MessageFormat; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Set; import org.eclipse.core.runtime.IStatus; import org.eclipse.jdt.internal.ui.dialogs.StatusInfo; import org.eclipse.jface.dialogs.DialogPage; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IMessageProvider; import org.eclipse.jface.preference.PreferencePage; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; 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.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import com.iw.plugins.spindle.Images; import com.iw.plugins.spindle.UIPlugin; /** came from ant ui * */ public abstract class AbstractPreferencePage extends PreferencePage implements IWorkbenchPreferencePage { private OverlayPreferenceStore fOverlayStore; private Map fCheckBoxes = new HashMap(); private SelectionListener fCheckBoxListener = new SelectionListener() { public void widgetDefaultSelected(SelectionEvent e) { } public void widgetSelected(SelectionEvent e) { Button button = (Button) e.widget; fOverlayStore.setValue((String) fCheckBoxes.get(button), button.getSelection()); } }; private Map fTextFields = new HashMap(); private ModifyListener fTextFieldListener = new ModifyListener() { public void modifyText(ModifyEvent e) { Text text = (Text) e.widget; fOverlayStore.setValue((String) fTextFields.get(text), text.getText()); } }; private Map fNumberFields = new HashMap(); private ModifyListener fNumberFieldListener = new ModifyListener() { public void modifyText(ModifyEvent e) { numberFieldChanged((Text) e.widget); } }; public AbstractPreferencePage(String titleKey, String imageName) { super(UIPlugin.getString(titleKey), Images.getImageDescriptor(imageName)); setPreferenceStore(UIPlugin.getDefault().getPreferenceStore()); fOverlayStore = createOverlayStore(); } protected abstract OverlayPreferenceStore createOverlayStore(); /* * (non-Javadoc) * * @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench) */ public void init(IWorkbench workbench) { } protected void initializeFields() { Map checkBoxes = getCheckBoxes(); Map textFields = getTextFields(); Iterator e = checkBoxes.keySet().iterator(); while (e.hasNext()) { Button b = (Button) e.next(); String key = (String) checkBoxes.get(b); b.setSelection(getOverlayStore().getBoolean(key)); } e = textFields.keySet().iterator(); while (e.hasNext()) { Text t = (Text) e.next(); String key = (String) textFields.get(t); t.setText(getOverlayStore().getString(key)); } } /* * (non-Javadoc) * * @see org.eclipse.jface.preference.IPreferencePage#performOk() */ public boolean performOk() { getOverlayStore().propagate(); UIPlugin.getDefault().savePluginPreferences(); return true; } protected OverlayPreferenceStore getOverlayStore() { return fOverlayStore; } protected OverlayPreferenceStore setOverlayStore() { return fOverlayStore; } protected Map getCheckBoxes() { return fCheckBoxes; } protected Map getTextFields() { return fTextFields; } protected Map getNumberFields() { return fNumberFields; } /* * (non-Javadoc) * * @see org.eclipse.jface.preference.PreferencePage#performDefaults() */ protected void performDefaults() { getOverlayStore().loadDefaults(); initializeFields(); handleDefaults(); super.performDefaults(); } protected abstract void handleDefaults(); /* * (non-Javadoc) * * @see org.eclipse.jface.dialogs.IDialogPage#dispose() */ public void dispose() { if (getOverlayStore() != null) { getOverlayStore().stop(); fOverlayStore = null; } super.dispose(); } protected Button addCheckBox(Composite parent, String labelText, String key, int indentation) { Button checkBox = new Button(parent, SWT.CHECK); checkBox.setText(labelText); checkBox.setFont(parent.getFont()); GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING); gd.horizontalIndent = indentation; gd.horizontalSpan = 2; checkBox.setLayoutData(gd); checkBox.addSelectionListener(fCheckBoxListener); getCheckBoxes().put(checkBox, key); return checkBox; } protected Control addTextField(Composite composite, String labelText, String key, int textLimit, int indentation, String[] errorMessages) { Font font = composite.getFont(); Label label = new Label(composite, SWT.NONE); label.setText(labelText); label.setFont(font); GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING); gd.horizontalIndent = indentation; label.setLayoutData(gd); Text textControl = new Text(composite, SWT.BORDER | SWT.SINGLE); textControl.setFont(font); gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING); gd.widthHint = convertWidthInCharsToPixels(textLimit + 1); textControl.setLayoutData(gd); textControl.setTextLimit(textLimit); getTextFields().put(textControl, key); if (errorMessages != null) { getNumberFields().put(textControl, errorMessages); textControl.addModifyListener(fNumberFieldListener); } else { textControl.addModifyListener(fTextFieldListener); } return textControl; } private void numberFieldChanged(Text textControl) { String number = textControl.getText(); IStatus status = validatePositiveNumber(number, (String[]) getNumberFields().get(textControl)); if (!status.matches(IStatus.ERROR)) { getOverlayStore().setValue((String) getTextFields().get(textControl), number); } updateStatus(status); } private IStatus validatePositiveNumber(String number, String[] errorMessages) { StatusInfo status = new StatusInfo(); if (number.length() == 0) { status.setError(errorMessages[0]); } else { try { int value = Integer.parseInt(number); if (value < 0) status.setError(MessageFormat.format(errorMessages[1], new String[] { number })); //$NON-NLS-1$ } catch (NumberFormatException e) { status.setError(MessageFormat.format(errorMessages[1], new String[] { number })); //$NON-NLS-1$ } } return status; } private void updateStatus(IStatus status) { if (!status.matches(IStatus.ERROR)) { Set keys = getNumberFields().keySet(); for (Iterator iter = keys.iterator(); iter.hasNext();) { Text text = (Text) iter.next(); IStatus s = validatePositiveNumber(text.getText(), (String[]) getNumberFields().get(text)); status = s.getSeverity() > status.getSeverity() ? s : status; } } setValid(!status.matches(IStatus.ERROR)); applyToStatusLine(this, status); } /* * Applies the status to the status line of a dialog page. */ private void applyToStatusLine(DialogPage page, IStatus status) { String message = status.getMessage(); switch (status.getSeverity()) { case IStatus.OK: page.setMessage(message, IMessageProvider.NONE); page.setErrorMessage(null); break; case IStatus.WARNING: page.setMessage(message, IMessageProvider.WARNING); page.setErrorMessage(null); break; case IStatus.INFO: page.setMessage(message, IMessageProvider.INFORMATION); page.setErrorMessage(null); break; default: if (message.length() == 0) { message = null; } page.setMessage(null); page.setErrorMessage(message); break; } } /** * Returns an array of size 2: - first element is of type <code>Label</code>- * second element is of type <code>Text</code> Use * <code>getLabelControl</code> and <code>getTextControl</code> to get the * 2 controls. */ protected Control[] addLabelledTextField(Composite composite, String label, String key, int textLimit, int indentation, String[] errorMessages) { Label labelControl = new Label(composite, SWT.NONE); labelControl.setText(label); labelControl.setFont(composite.getFont()); GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING); gd.horizontalIndent = indentation; labelControl.setLayoutData(gd); Text textControl = new Text(composite, SWT.BORDER | SWT.SINGLE); gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING); gd.widthHint = convertWidthInCharsToPixels(textLimit + 1); textControl.setLayoutData(gd); textControl.setTextLimit(textLimit); textControl.setFont(composite.getFont()); fTextFields.put(textControl, key); if (errorMessages != null) { fNumberFields.put(textControl, errorMessages); textControl.addModifyListener(fNumberFieldListener); } else { textControl.addModifyListener(fTextFieldListener); } return new Control[] { labelControl, textControl }; } protected Group createGroup(int numColumns, Composite parent, String text) { final Group group = new Group(parent, SWT.NONE); GridData gd = new GridData(GridData.FILL_HORIZONTAL); gd.horizontalSpan = numColumns; gd.widthHint = 0; group.setLayoutData(gd); group.setFont(parent.getFont()); final GridLayout layout = new GridLayout(numColumns, false); layout.verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); layout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING); layout.marginHeight = 0; layout.marginWidth = 0; convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN); group.setLayout(layout); group.setText(text); return group; } protected String loadPreviewContentFromFile(String filename) { String line; String separator = System.getProperty("line.separator"); //$NON-NLS-1$ StringBuffer buffer = new StringBuffer(512); BufferedReader reader = null; try { reader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(filename))); while ((line = reader.readLine()) != null) { buffer.append(line); buffer.append(separator); } } catch (IOException io) { UIPlugin.log(io); } finally { if (reader != null) { try { reader.close(); } catch (IOException e) { } } } return buffer.toString(); } }