Java tutorial
/* Copyright 2007-2014 Fraunhofer IGD, http://www.igd.fraunhofer.de Fraunhofer-Gesellschaft - Institut fr Graphische Datenverarbeitung See the NOTICE file distributed with this work for additional information regarding copyright ownership Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package org.ops4j.pax.cursor.ui; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IInputValidator; import org.eclipse.jface.resource.StringConverter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.FocusEvent; import org.eclipse.swt.events.FocusListener; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class AddEditUrlDialog extends Dialog { private final String title = "Add Bundle from URL"; private final String urlMessage = "Enter bundle URL"; private final String levelMessage = "Enter start level"; private Text urlInput; private Text levelInput; private Text errorMessageText; private String errorMessage; private IInputValidator validator; private String url; private String level; public AddEditUrlDialog(Shell parentShell) { super(parentShell); url = ""; level = "10"; } public AddEditUrlDialog(Shell parentShell, String lvl) { super(parentShell); url = ""; level = lvl; } public String getURL() { return url; } public String getLevel() { return level; } @Override protected Control createDialogArea(Composite parent) { Composite composite = (Composite) super.createDialogArea(parent); validator = new IInputValidator() { public String isValid(String newText) { try { Integer.parseInt(newText); return null; } catch (NumberFormatException e) { return "Level must be an integer"; } } }; Label urlLabel = new Label(composite, SWT.WRAP); urlLabel.setText(urlMessage); GridData urlData = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); urlData.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH); urlLabel.setLayoutData(urlData); urlLabel.setFont(parent.getFont()); urlInput = new Text(composite, SWT.SINGLE | SWT.BORDER); urlInput.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); urlInput.setText(url); urlInput.addFocusListener(new FocusListener() { public void focusLost(FocusEvent e) { } public void focusGained(FocusEvent e) { urlInput.selectAll(); } }); urlInput.setFocus(); Label lvlLabel = new Label(composite, SWT.WRAP); lvlLabel.setText(levelMessage); GridData lvlData = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); lvlData.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH); lvlLabel.setLayoutData(lvlData); lvlLabel.setFont(parent.getFont()); levelInput = new Text(composite, SWT.SINGLE | SWT.BORDER); levelInput.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); levelInput.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { validateLevel(); } }); levelInput.setText(String.valueOf(level)); levelInput.addFocusListener(new FocusListener() { public void focusLost(FocusEvent e) { } public void focusGained(FocusEvent e) { levelInput.selectAll(); } }); errorMessageText = new Text(composite, SWT.READ_ONLY | SWT.WRAP); errorMessageText.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); errorMessageText.setBackground(errorMessageText.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); setErrorMessage(errorMessage); errorMessageText.setForeground(new Color(errorMessageText.getDisplay(), 255, 0, 0)); applyDialogFont(composite); return composite; } protected void setErrorMessage(String errorMessage) { this.errorMessage = errorMessage; if (errorMessageText != null && !errorMessageText.isDisposed()) { errorMessageText.setText(errorMessage == null ? " \n " : errorMessage); //$NON-NLS-1$ // Disable the error message text control if there is no error, or // no error text (empty or whitespace only). Hide it also to avoid // color change. // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=130281 boolean hasError = errorMessage != null && (StringConverter.removeWhiteSpaces(errorMessage)).length() > 0; errorMessageText.setEnabled(hasError); errorMessageText.setVisible(hasError); errorMessageText.getParent().update(); // Access the ok button by id, in case clients have overridden button creation. // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=113643 Control button = getButton(IDialogConstants.OK_ID); if (button != null) { button.setEnabled(errorMessage == null); } } } protected void validateLevel() { String errorMessage = null; if (validator != null) { errorMessage = validator.isValid(levelInput.getText()); } setErrorMessage(errorMessage); } @Override protected void configureShell(Shell newShell) { super.configureShell(newShell); newShell.setText(title); } /* * (non-Javadoc) Method declared on Dialog. */ protected void buttonPressed(int buttonId) { if (buttonId == IDialogConstants.OK_ID) { url = urlInput.getText().trim(); level = "" + Integer.parseInt(levelInput.getText()); } else { url = null; level = ""; } super.buttonPressed(buttonId); } }