Java tutorial
package icecaptools.launching.arduino; /******************************************************************************* * Copyright (c) 2000, 2006 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 * Thomas Koeckerbauer GUP, JKU - modification of InputDialog for passwords *******************************************************************************/ import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IInputValidator; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; 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; /** * A simple password dialog for soliciting a password string from the user. * <p> * This concrete dialog class can be instantiated as is, or further subclassed * as required. * </p> * NOTE: This is a modified version of org.eclipse.jface.dialogs.InputDialog * which was changed to have a password entry text widget. */ public class PasswordDialog extends Dialog { /** * The title of the dialog. */ private String title; /** * The message to display, or <code>null</code> if none. */ private String message; /** * The input value; the empty string by default. */ private String value = "";//$NON-NLS-1$ /** * The input validator, or <code>null</code> if none. */ private IInputValidator validator; /** * Ok button widget. */ private Button okButton; /** * Input text widget. */ private Text text; /** * Error message label widget. */ private Text errorMessageText; /** * Error message string. */ private String errorMessage; /** * Creates an input dialog with OK and Cancel buttons. Note that the dialog * will have no visual representation (no widgets) until it is told to open. * <p> * Note that the <code>open</code> method blocks for input dialogs. * </p> * * @param parentShell * the parent shell, or <code>null</code> to create a top-level * shell * @param dialogTitle * the dialog title, or <code>null</code> if none * @param dialogMessage * the dialog message, or <code>null</code> if none * @param initialValue * the initial input value, or <code>null</code> if none * (equivalent to the empty string) * @param validator * an input validator, or <code>null</code> if none */ public PasswordDialog(final Shell parentShell, final String dialogTitle, final String dialogMessage, final String initialValue, final IInputValidator validator) { super(parentShell); this.title = dialogTitle; this.message = dialogMessage; if (initialValue == null) { this.value = "";//$NON-NLS-1$ } else { this.value = initialValue; } this.validator = validator; } /* * (non-Javadoc) Method declared on Dialog. */ @Override protected void buttonPressed(final int buttonId) { if (buttonId == IDialogConstants.OK_ID) { this.value = this.text.getText(); } else { this.value = null; } super.buttonPressed(buttonId); } /* * (non-Javadoc) * * @see * org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets * .Shell) */ @Override protected void configureShell(final Shell shell) { super.configureShell(shell); if (this.title != null) { shell.setText(this.title); } } /* * (non-Javadoc) * * @see * org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse * .swt.widgets.Composite) */ @Override protected void createButtonsForButtonBar(final Composite parent) { // create OK and Cancel buttons by default this.okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); // do this here because setting the text will set enablement on the ok // button this.text.setFocus(); if (this.value != null) { this.text.setText(this.value); this.text.selectAll(); } } /* * (non-Javadoc) Method declared on Dialog. */ @Override protected Control createDialogArea(final Composite parent) { // create composite Composite composite = (Composite) super.createDialogArea(parent); // create message if (this.message != null) { Label label = new Label(composite, SWT.WRAP); label.setText(this.message); GridData data = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH); label.setLayoutData(data); label.setFont(parent.getFont()); } this.text = new Text(composite, SWT.SINGLE | SWT.BORDER | SWT.PASSWORD); this.text.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); this.text.addModifyListener(new ModifyListener() { public void modifyText(final ModifyEvent e) { validateInput(); } }); this.errorMessageText = new Text(composite, SWT.READ_ONLY); this.errorMessageText .setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); this.errorMessageText .setBackground(this.errorMessageText.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); // Set the error message text // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=66292 setErrorMessage(this.errorMessage); applyDialogFont(composite); return composite; } /** * Returns the error message label. * * @return the error message label * @deprecated use setErrorMessage(String) instead */ @Deprecated protected Label getErrorMessageLabel() { return null; } /** * Returns the ok button. * * @return the ok button */ protected Button getOkButton() { return this.okButton; } /** * Returns the text area. * * @return the text area */ protected Text getText() { return this.text; } /** * Returns the validator. * * @return the validator */ protected IInputValidator getValidator() { return this.validator; } /** * Returns the string typed into this input dialog. * * @return the input string */ public String getValue() { return this.value; } /** * Validates the input. * <p> * The default implementation of this framework method delegates the request * to the supplied input validator object; if it finds the input invalid, * the error message is displayed in the dialog's message line. This hook * method is called whenever the text changes in the input field. * </p> */ protected void validateInput() { String errorMsg = null; if (this.validator != null) { errorMsg = this.validator.isValid(this.text.getText()); } // Bug 16256: important not to treat "" (blank error) the same as null // (no error) setErrorMessage(errorMsg); } /** * Sets or clears the error message. If not <code>null</code>, the OK button * is disabled. * * @param errorMessage * the error message, or <code>null</code> to clear * @since 3.0 */ public void setErrorMessage(final String errorMessage) { this.errorMessage = errorMessage; if (this.errorMessageText != null && !this.errorMessageText.isDisposed()) { this.errorMessageText.setText(errorMessage == null ? "" : errorMessage); //$NON-NLS-1$ this.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); } } } }