Java tutorial
/*! * This program is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software * Foundation. * * You should have received a copy of the GNU Lesser General Public License along with this * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html * or from the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details. * * Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved. */ package org.pentaho.gwt.widgets.client.text; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.KeyUpEvent; import com.google.gwt.event.dom.client.KeyUpHandler; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.PopupPanel; import com.google.gwt.user.client.ui.PopupPanel.PositionCallback; import com.google.gwt.user.client.ui.SimplePanel; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.VerticalPanel; import org.pentaho.gwt.widgets.client.utils.ElementUtils; import org.pentaho.gwt.widgets.client.utils.Rectangle; public class ValidationTextBox extends HorizontalPanel implements IValidationTextBox { private TextBox textBox; private PopupPanel popupPanel; private String validationMessage; private SimplePanel imagePanel; private Image image; private ValidationTextBoxKeyUpHandlerCollection handlers; private ValidationTextBoxListenerCollection listeners; public ValidationTextBox() { textBox = new TextBox(); textBox.addKeyUpHandler(new KeyUpHandler() { @Override public void onKeyUp(KeyUpEvent event) { performValidation(true); fireOnKeyUp(event); } }); imagePanel = new SimplePanel() { @Override public void onBrowserEvent(Event event) { super.onBrowserEvent(event); switch (DOM.eventGetType(event)) { case Event.ONMOUSEOVER: { if (!validate()) { showMessagePopup(); } break; } case Event.ONMOUSEOUT: { hideMessagePopup(); break; } } } }; imagePanel.setStylePrimaryName("validation-textbox-image-panel"); //$NON-NLS-1$ imagePanel.sinkEvents(Event.ONMOUSEOVER | Event.ONMOUSEOUT); this.add(textBox); textBox.setWidth("100%"); this.setCellWidth(textBox, "100%"); this.setStylePrimaryName("custom-text-box"); //$NON-NLS-1$ SimplePanel hSpacer = new SimplePanel(); hSpacer.setWidth("10px"); this.add(hSpacer); image = new Image(GWT.getModuleBaseURL() + "images/spacer.gif"); //$NON-NLS-1$ image.setStylePrimaryName("validation-textbox-image"); imagePanel.add(image); imagePanel.addStyleDependentName("invalid"); this.add(imagePanel); } public void addKeyUpHandler(KeyUpHandler handler) { if (handlers == null) { handlers = new ValidationTextBoxKeyUpHandlerCollection(); } handlers.add(handler); } public void removeKeyUpHandler(KeyUpHandler handler) { if (handlers != null) { handlers.remove(handler); } } /** * Fire all current {@link KeyUpHandler}. */ void fireOnKeyUp(KeyUpEvent event) { if (handlers != null) { handlers.fireOnKeyUp(event); } } public void addValidatableTextBoxListener(IValidationTextBoxListener listener) { if (listeners == null) { listeners = new ValidationTextBoxListenerCollection(); } listeners.add(listener); } public void removeValidatableTextBoxListener(IValidationTextBoxListener listener) { if (listeners != null) { listeners.remove(listener); } } /** * Fire all current {@link IValidationTextBoxListener}. */ void fireOnSuccess() { if (listeners != null) { listeners.fireOnSuccess(this); } } /** * Fire all current {@link IValidationTextBoxListener}. */ void fireOnFailure() { if (listeners != null) { listeners.fireOnFailure(this); } } private void performValidation(boolean showPopUp) { if (!validate()) { fireOnFailure(); imagePanel.removeStyleDependentName("valid"); imagePanel.addStyleDependentName("invalid"); if (showPopUp) { showMessagePopup(); } } else { fireOnSuccess(); imagePanel.removeStyleDependentName("invalid"); imagePanel.addStyleDependentName("valid"); hideMessagePopup(); } } @Override public boolean validate() { // TODO Auto-generated method stub return false; } public String getValidationMessage() { return validationMessage; } public void setValidationMessage(String validationMessage) { this.validationMessage = validationMessage; } public TextBox getManagedObject() { return textBox; } public String getValue() { return textBox.getValue(); } public void setValue(String value) { textBox.setValue(value); performValidation(false); } public String getText() { return textBox.getText(); } private void showMessagePopup() { Label validationMessageLabel = new Label(); validationMessageLabel.setStyleName("validation-textbox-message-label"); //$NON-NLS-1$ validationMessageLabel.setText(getValidationMessage()); VerticalPanel messagePanel = new VerticalPanel(); messagePanel.add(validationMessageLabel); HorizontalPanel bottomPanel = new HorizontalPanel(); SimplePanel hSpacer = new SimplePanel(); hSpacer.setStylePrimaryName("validation-textbox-left-image-buffer"); //$NON-NLS-1$ bottomPanel.add(hSpacer); SimplePanel tailImagePanel = new SimplePanel(); image = new Image(GWT.getModuleBaseURL() + "images/spacer.gif"); //$NON-NLS-1$ image.setStylePrimaryName("validation-textbox-tail-image"); //$NON-NLS-1$ tailImagePanel.add(image); bottomPanel.add(tailImagePanel); messagePanel.add(bottomPanel); popupPanel = new PopupPanel(true, false); popupPanel.setWidget(messagePanel); popupPanel.setPopupPositionAndShow(new PositionCallback() { public void setPosition(int offsetWidth, int offsetHeight) { int absLeft = -1; int absTop = -1; absLeft = textBox.getAbsoluteLeft(); absTop = textBox.getAbsoluteTop(); Rectangle popupSize = ElementUtils.getSize(popupPanel.getElement()); popupPanel.setPopupPosition(absLeft, absTop - popupSize.height >= 0 ? absTop - popupSize.height : absTop); } }); popupPanel.show(); } private void hideMessagePopup() { if (popupPanel != null) { popupPanel.hide(); } } }