Java tutorial
/* * ARX: Powerful Data Anonymization * Copyright 2012 - 2018 Fabian Prasser and contributors * * 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.deidentifier.arx.gui.view.impl.menu; import org.deidentifier.arx.gui.resources.Resources; import org.deidentifier.arx.gui.view.def.IValidator; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.resource.StringConverter; import org.eclipse.jface.window.Window; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.ShellAdapter; import org.eclipse.swt.events.ShellEvent; import org.eclipse.swt.events.ShellListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Combo; 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 selection dialog for elements from a combo box. * * @author Fabian Prasser */ public class DialogComboDoubleSelection 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 value1 = ""; //$NON-NLS-1$ /** The input value; the empty string by default. */ private String value2 = ""; //$NON-NLS-1$ /** The input validator, or <code>null</code> if none. */ private IValidator<String[]> validator; /** Choices for combo widget. */ private String[] choices1; /** Choices for combo widget. */ private String[] choices2; /** Input combo widget. */ private Combo combo1; /** Input combo widget. */ private Combo combo2; /** Error message label widget. */ private Text errorMessageText; /** Error message string. */ private String errorMessage; /** * Creates a new instance * @param parentShell * @param dialogTitle * @param dialogMessage * @param choices1 * @param initialValue1 * @param choices2 * @param initialValue2 * @param validator */ public DialogComboDoubleSelection(Shell parentShell, String dialogTitle, String dialogMessage, String[] choices1, String initialValue1, String[] choices2, String initialValue2, IValidator<String[]> validator) { super(parentShell); this.title = dialogTitle; message = dialogMessage; this.choices1 = choices1; this.choices2 = choices2; if (initialValue1 == null) { value1 = "";//$NON-NLS-1$ } else { value1 = initialValue1; } if (initialValue2 == null) { value2 = "";//$NON-NLS-1$ } else { value2 = initialValue2; } this.validator = validator; } /** * Returns the string typed into this input dialog. * * @return the input string */ public String getValue1() { return value1; } /** * Returns the string typed into this input dialog. * * @return the input string */ public String getValue2() { return value2; } /** * 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(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); } } } @Override protected void buttonPressed(int buttonId) { if (buttonId == IDialogConstants.OK_ID) { value1 = combo1.getText(); value2 = combo2.getText(); } else { value1 = null; value2 = null; } super.buttonPressed(buttonId); } @Override protected void configureShell(Shell shell) { super.configureShell(shell); if (title != null) { shell.setText(title); } shell.setImages(Resources.getIconSet(shell.getDisplay())); } @Override protected void createButtonsForButtonBar(Composite parent) { // Create OK and Cancel buttons by default 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 combo1.setFocus(); if (value1 != null) { combo1.setText(value1); } combo2.setFocus(); if (value2 != null) { combo2.setText(value2); } } @Override protected Control createDialogArea(Composite parent) { // create composite Composite composite = (Composite) super.createDialogArea(parent); // create message if (message != null) { Label label = new Label(composite, SWT.WRAP); label.setText(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()); } combo1 = new Combo(composite, SWT.NONE); combo1.setItems(choices1); combo1.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); combo1.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { validateInput(); } }); combo2 = new Combo(composite, SWT.NONE); combo2.setItems(choices2); combo2.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); combo2.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { validateInput(); } }); 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)); // Set the error message text // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=66292 setErrorMessage(errorMessage); applyDialogFont(composite); return composite; } @Override protected ShellListener getShellListener() { return new ShellAdapter() { @Override public void shellClosed(final ShellEvent event) { setReturnCode(Window.CANCEL); } }; } /** * 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 (validator != null) { errorMsg = validator.isValid(new String[] { combo1.getText(), combo2.getText() }); } // Bug 16256: important not to treat "" (blank error) the same as null // (no error) setErrorMessage(errorMsg); } }