Java tutorial
package com.scsb.crpro; import java.io.Serializable; import com.vaadin.server.Resource; import com.vaadin.server.ThemeResource; import com.vaadin.shared.ui.label.ContentMode; import com.vaadin.ui.Alignment; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Button.ClickListener; import com.vaadin.ui.Component; import com.vaadin.ui.Embedded; import com.vaadin.ui.GridLayout; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Label; import com.vaadin.ui.Panel; import com.vaadin.ui.UI; import com.vaadin.ui.Window; /** * <p><b>DESCRIPTION AND FEATURES</b></p> * <p>MessageBox is a flexible utility class for generating different styles of message boxes. * The message box is typically a modal dialog, with an icon on the left side, * a message on the right of the icon and some buttons on the bottom of the dialog.</p> * <p>The class is designed to be very flexible. E.g. you can define * <ul> * <li>the window caption</li> * <li>different types of icons (see {@link Icon})</li> * <li>a simple message as string, optionally formatted with HTML elements</li> * <li>a complex message designed with multiple Vaadin components</li> * <li>how many buttons are placed on the dialog</li> * <li>the caption for the buttons for your specific language</li> * <li>the icon of the buttons (see {@link ButtonType})</li> * <li>one simple event listener (see {@link EventListener}) for all buttons</li> * <li>the buttons alignment (left, centered, right)</li> * <li>optionally the window width and height, if required (full automated layout seems not to be possible yet)</li> * </ul> * There are different simple/complex constructors are available to influence the appearance * of the message box. * </p> * <p>Additionally, you can override the default behavior of the dialog and its components by using the published static member fields: * <ul> * <li>the size of the dialog using {@code DIALOG_DEFAULT_WIDTH} and {@code DIALOG_DEFAULT_HEIGHT}</li> * <li>the button default alignment using {@code BUTTON_DEFAULT_ALIGNMENT}</li> * <li>the button default width using {@code BUTTON_DEFAULT_WIDTH}</li> * <li>customized icons using {@code RESOURCE_FACTORY}</li> * </ul> * The static member fields should be overridden at the start of the application. (Okay, that information should not really surprise). * <br> * <p><b>USAGE</b></p> * <p><code> * <pre> MessageBox mb = new MessageBox(getWindow(), * "My message ...", * MessageBox.Icon.INFO, * "Hello World!", * new MessageBox.ButtonConfig(ButtonType.OK, "Ok")); * mb.show();</pre></code> * This example shows a simple message dialog, with "My message ..." as dialog * caption, an info icon, "Hello World!" as message and an "Ok" labeled button. The * dialog is displayed modally. You can simply add further ButtonConfigs after * the "Ok"-button. To receive an event of the pressed button, add an event listener (see * {@link EventListener}) as parameter to the show method (see * {@link #show(EventListener)} or {@link #show(boolean, EventListener)}). Dialog width and * height can be optionally set, if required.</p> * <br> * <p><b>LICENSE</b></p> * <p>The licenses are suitable for commercial usage.</p> * * <p>Code license: Apache License 2.0</p> * * <p>Dialog icons: * <ul><li>Author: Dieter Steinwedel</li> * <li>License: Creative Commons Attribution 2.5 License</li></ul></p> * * <p>Button icons: * <ul><li>Author: Mark James</li> * <li>URL: <a href="http://www.famfamfam.com/lab/icons/silk/">http://www.famfamfam.com/lab/icons/silk/</a></li> * <li>License: Creative Commons Attribution 2.5 License</li></ul></p> * * @author Dieter Steinwedel */ public class MessageBox extends Window { private static final long serialVersionUID = 1L; public static String DIALOG_DEFAULT_WIDTH = "400px"; public static String GRID_DEFAULT_WIDTH1 = "375px"; public static String GRID_DEFAULT_WIDTH2 = "320px"; public static String DIALOG_DEFAULT_HEIGHT = null; public static String BUTTON_DEFAULT_WIDTH = "100px"; public static Alignment BUTTON_DEFAULT_ALIGNMENT = Alignment.MIDDLE_RIGHT; public static String ICON_DEFAULT_SIZE = "48px"; public static VisibilityInterceptor VISIBILITY_INTERCEPTOR; private EventListener listener; /** * Defines the possible icon types for the message box. * * @author Dieter Steinwedel */ public static enum Icon { NONE, QUESTION, INFO, WARN, ERROR } /** * Defines the possible buttons type for the message box. The button type * defines which icon is displayed on the button. The button type is also * used for the event listener (see {@link EventListener}) to determine which button is pressed. * * @author ds */ public static enum ButtonType { OK, ABORT, CANCEL, YES, NO, CLOSE, SAVE, RETRY, IGNORE, /** * The message box is not closed on using this value. You may have to explicitly close the message box. */ HELP, NONE, CUSTOM1, CUSTOM2, CUSTOM3, CUSTOM4, CUSTOM5 } /** * This class defines the appearance and caption of a button displayed inside * the message box. * * @author Dieter Steinwedel */ public static class ButtonConfig implements Serializable { private static final long serialVersionUID = 1L; private Resource optionalResource; private ButtonType buttonType; private String caption; private String width; /** * Equals to {@link ButtonConfig(ButtonType, String, String)}, but the button * icon resource is set explicitly. * * @param optionalResource an none default resource, that should be displayed as icon */ public ButtonConfig(ButtonType buttonType, String caption, String width, Resource optionalResource) { super(); if (buttonType == null) { throw new IllegalArgumentException("The field buttonType cannot be null"); } this.optionalResource = optionalResource; this.buttonType = buttonType; this.caption = caption; this.width = width; } /** * Equals to {@link ButtonConfig(ButtonType, String)}, but the button * width is set explicitly instead of using {@code BUTTON_DEFAULT_WIDTH}. * * @param width button width */ public ButtonConfig(ButtonType buttonType, String caption, String width) { this(buttonType, caption, width, null); } /** * Creates an instance of this class for defining the appearance and * caption of a button displayed inside the message box. * * @param buttonType which button type (see {@link ButtonType}) * @param caption caption of the button */ public ButtonConfig(ButtonType buttonType, String caption) { this(buttonType, caption, BUTTON_DEFAULT_WIDTH); } /** * Returns the optional resource, if set. * * @return optional resource. */ public Resource getOptionalResource() { return optionalResource; } /** * Returns the button type. * * @return button type */ public ButtonType getButtonType() { return buttonType; } /** * Returns the button caption. * * @return button caption */ public String getCaption() { return caption; } /** * Returns the button width. * * @return button width */ public String getWidth() { return width; } } /** * Intercepts the displaying and closing of the dialog. * * @author ds */ public interface VisibilityInterceptor extends Serializable { /** * Intercepts the displaying of the dialog. * * @param parentWindow The parent Window for the <code>MessageBox</code> * @param displayedDialog The <code>MessageBox</code> instance to be displayed * @return Returns <code>false</code>, if the method implementation opens the <code>MessageBox</code> window itself. Otherwise returns <code>true</code>. */ public boolean show(MessageBox displayedDialog); /** * Intercepts the closing of the dialog. * * @param parentWindow The parent Window for the <code>MessageBox</code> * @param displayedDialog The <code>MessageBox</code> instance to be displayed * @return Returns <code>false</code>, if the method implementation closes the <code>MessageBox</code> window itself. Otherwise returns <code>true</code>. */ public boolean close(MessageBox displayedDialog); } /** * This event listener is triggered when a button of the message box is pressed. * * @author ds */ public interface EventListener extends Serializable { /** * The method is triggered when a button of the message box is pressed. The * parameter describes, which configured button was pressed. * * @param buttonType pressed button */ public void buttonClicked(ButtonType buttonType); } /** * Private implementation for handling the button events. * * @author ds */ private class ButtonClickListener implements ClickListener { private static final long serialVersionUID = 1L; private ButtonType buttonType; /** * The constructor. */ public ButtonClickListener(ButtonType buttonType) { this.buttonType = buttonType; } /** * @see com.vaadin.ui.Button.ClickListener#buttonClick(com.vaadin.ui.Button.ClickEvent) */ public void buttonClick(ClickEvent event) { if (!buttonType.equals(ButtonType.HELP)) { close(); } if (listener != null) { listener.buttonClicked(buttonType); } } } /** * Creates an MessageBox instance. * * @param parentWindow the parent window * @param dialogCaption the caption of the dialog * @param dialogIcon the displayed icon * @param message the displayed message * @param buttonConfigs the displayed buttons (see {@link ButtonConfig}) */ public MessageBox(String dialogCaption, String message) { this(DIALOG_DEFAULT_WIDTH, DIALOG_DEFAULT_HEIGHT, dialogCaption, Icon.INFO, message, BUTTON_DEFAULT_ALIGNMENT, new MessageBox.ButtonConfig(ButtonType.OK, "OK")); } public MessageBox(String dialogCaption, Icon dialogIcon, String message, ButtonConfig... buttonConfigs) { this(DIALOG_DEFAULT_WIDTH, DIALOG_DEFAULT_HEIGHT, dialogCaption, dialogIcon, message, BUTTON_DEFAULT_ALIGNMENT, buttonConfigs); } /** * Similar to {@link #MessageBox(Window, String, Icon, String, ButtonConfig...)}, * but the alignment of the buttons is an additional button. * * @param buttonsAlignment alignment of the button. */ public MessageBox(String dialogCaption, Icon dialogIcon, String message, Alignment buttonsAlignment, ButtonConfig... buttonConfigs) { this(DIALOG_DEFAULT_WIDTH, DIALOG_DEFAULT_HEIGHT, dialogCaption, dialogIcon, message, buttonsAlignment, buttonConfigs); } /** * Similar to {@link #MessageBox(Window, String, Icon, String, Alignment, ButtonConfig...)}, * but the window size is defined explicitly. * * @param dialogWidth width of the dialog (e.g. absolute "100px" or relative "50%") * @param dialogHeight height of the dialog (e.g. absolute "100px" or relative "50%") */ public MessageBox(String dialogWidth, String dialogHeight, String dialogCaption, Icon dialogIcon, String message, Alignment buttonsAlignment, ButtonConfig... buttonConfigs) { this(dialogWidth, dialogHeight, dialogCaption, dialogIcon, new Label(message, ContentMode.HTML), buttonsAlignment, buttonConfigs); } /** * Similar to {@link #MessageBox(Window, String, Icon, String, Alignment, ButtonConfig...)}, * but the message component is defined explicitly. The component can be even a composite * of a layout manager and manager further Vaadin components. * * @param messageComponent a Vaadin component */ public MessageBox(String dialogWidth, String dialogHeight, String dialogCaption, Icon dialogIcon, Component messageComponent, Alignment buttonsAlignment, ButtonConfig... buttonConfigs) { super(); setResizable(false); setClosable(false); setSizeUndefined(); setWidth(dialogWidth); //setHeight(dialogHeight); setCaption(dialogCaption); GridLayout mainLayout = new GridLayout(2, 2); mainLayout.setMargin(true); mainLayout.setSpacing(true); mainLayout.setSizeUndefined(); mainLayout.setWidth(GRID_DEFAULT_WIDTH1); // Add Content messageComponent.setSizeUndefined(); messageComponent.setWidth(GRID_DEFAULT_WIDTH2); if (dialogIcon == null || Icon.NONE.equals(dialogIcon)) { mainLayout.addComponent(messageComponent, 0, 0, 1, 0); mainLayout.setRowExpandRatio(0, 1.0f); mainLayout.setColumnExpandRatio(0, 1.0f); } else { mainLayout.addComponent(messageComponent, 1, 0); mainLayout.setRowExpandRatio(0, 1.0f); mainLayout.setColumnExpandRatio(1, 1.0f); Embedded icon = null; switch (dialogIcon) { case QUESTION: icon = new Embedded(null, new ThemeResource("images/question.png")); break; case INFO: icon = new Embedded(null, new ThemeResource("images/info.png")); break; case WARN: icon = new Embedded(null, new ThemeResource("images/warn.png")); break; case ERROR: icon = new Embedded(null, new ThemeResource("images/error.png")); break; } mainLayout.addComponent(icon, 0, 0); icon.setWidth(ICON_DEFAULT_SIZE); icon.setHeight(ICON_DEFAULT_SIZE); } // Add Buttons HorizontalLayout buttonLayout = new HorizontalLayout(); buttonLayout.setSpacing(true); mainLayout.addComponent(buttonLayout, 0, 1, 1, 1); mainLayout.setComponentAlignment(buttonLayout, buttonsAlignment); for (ButtonConfig buttonConfig : buttonConfigs) { Button button = new Button(buttonConfig.getCaption(), new ButtonClickListener(buttonConfig.getButtonType())); if (buttonConfig.getWidth() != null) { button.setWidth(buttonConfig.getWidth()); } if (buttonConfig.getOptionalResource() != null) { button.setIcon(buttonConfig.getOptionalResource()); } else { Resource icon = null; switch (buttonConfig.getButtonType()) { case ABORT: icon = new ThemeResource("images/famfamfam/cross.png"); break; case CANCEL: icon = new ThemeResource("images/famfamfam/cross.png"); break; case CLOSE: icon = new ThemeResource("images/famfamfam/door.png"); break; case HELP: icon = new ThemeResource("images/famfamfam/lightbulb.png"); break; case OK: icon = new ThemeResource("images/famfamfam/tick.png"); break; case YES: icon = new ThemeResource("images/famfamfam/tick.png"); break; case NO: icon = new ThemeResource("images/famfamfam/cross.png"); break; case SAVE: icon = new ThemeResource("images/famfamfam/disk.png"); break; case RETRY: icon = new ThemeResource("images/famfamfam/arrow_refresh.png"); break; case IGNORE: icon = new ThemeResource("images/famfamfam/lightning_go.png"); break; } button.setIcon(icon); } buttonLayout.addComponent(button); } setContent(mainLayout); } /** * Displays the message box in modal style. No listener is used. */ public void show() { show(true, null); } /** * Displays the message box. No listener is used. * * @param modal switches the message box modal or none-modal */ public void show(boolean modal) { show(modal, null); } /** * Displays the message box in modal style with triggering the event listener on pressing a button. * * @param listener trigger the parameterized listener on pressing a button */ public void show(EventListener listener) { show(true, listener); } /** * Displays the message box with triggering the event listener on pressing a button. * * @param modal switches the message box modal or none-modal * @param listener trigger the parameterized listener on pressing a button */ public void show(boolean modal, EventListener listener) { this.listener = listener; setModal(modal); if (VISIBILITY_INTERCEPTOR == null || (VISIBILITY_INTERCEPTOR != null && VISIBILITY_INTERCEPTOR.show(this))) { UI.getCurrent().addWindow(this); } } /** * Closes the message box. Call this method, if the dialog should be closed without a button event, e.g. by a timeout. * The buttons inside the dialog close automatically the message box. */ public void close() { if (VISIBILITY_INTERCEPTOR == null || (VISIBILITY_INTERCEPTOR != null && VISIBILITY_INTERCEPTOR.close(this))) { UI.getCurrent().removeWindow(this); } } }