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| - | In this part of the Java Gnome programming tutorial, we will introduce dialogs.
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| - | __TOC__
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| - | Dialog windows or dialogs are an indispensable part of most modern GUI applications.
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| - | A dialog is defined as a conversation between two or more persons. In a computer application a dialog is a window which is used to "talk" to the application.
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| - | A dialog is used to input data, modify data, change the application settings etc.
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| - | Dialogs are important means of communication between a user and a computer program.
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| - | == Message dialogs ==
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| - | Message dialogs are convenient dialogs that provide messages to the user of the application. The message consists of textual and image data.
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| - |
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| - | <source lang="java">
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| - | package com.zetcode;
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| - | import org.gnome.gdk.Event;
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| - | import org.gnome.gtk.Button;
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| - | import org.gnome.gtk.ButtonsType;
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| - | import org.gnome.gtk.Gtk;
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| - | import org.gnome.gtk.MessageDialog;
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| - | import org.gnome.gtk.MessageType;
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| - | import org.gnome.gtk.Table;
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| - | import org.gnome.gtk.Widget;
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| - | import org.gnome.gtk.Window;
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| - | import org.gnome.gtk.WindowPosition;
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| - | /**
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| - | * Java Gnome tutorial
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| - | *
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| - | * This program shows four
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| - | * message dialogs.
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| - | *
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| - | * @author jan bodnar
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| - | * website zetcode.com
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| - | * last modified March 2009
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| - | */
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| - | public class GMessages extends Window {
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| - | Window parent;
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| - | public GMessages() {
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| - | setTitle("GMessages");
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| - | initUI();
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| - | parent = this;
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| - | connect(new Window.DeleteEvent() {
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| - | public boolean onDeleteEvent(Widget source, Event event) {
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| - | Gtk.mainQuit();
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| - | return false;
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| - | }
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| - | });
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| - | setDefaultSize(250, 100);
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| - | setPosition(WindowPosition.CENTER);
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| - | showAll();
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| - | }
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| - | public void initUI() {
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| - | Table table = new Table(2, 2, true);
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| - | Button info = new Button("Information");
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| - | Button warn = new Button("Warning");
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| - | Button ques = new Button("Question");
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| - | Button erro = new Button("Error");
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| - | info.connect(new Button.Clicked() {
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| - | public void onClicked(Button button) {
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| - | MessageDialog md = new MessageDialog(null, true,
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| - | MessageType.INFO,
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| - | ButtonsType.CLOSE, "Download completed");
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| - | md.setPosition(WindowPosition.CENTER);
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| - | md.run();
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| - | md.hide();
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| - | }
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| - | });
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| - | warn.connect(new Button.Clicked() {
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| - | public void onClicked(Button button) {
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| - | MessageDialog md = new MessageDialog(parent, true,
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| - | MessageType.WARNING,
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| - | ButtonsType.CLOSE, "Unallowed operation");
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| - | md.setPosition(WindowPosition.CENTER);
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| - | md.run();
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| - | md.hide();
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| - | }
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| - | });
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| - | ques.connect(new Button.Clicked() {
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| - | public void onClicked(Button button) {
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| - | MessageDialog md = new MessageDialog(null, true,
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| - | MessageType.QUESTION,
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| - | ButtonsType.CLOSE, "Are you sure to quit?");
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| - | md.setPosition(WindowPosition.CENTER);
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| - | md.run();
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| - | md.hide();
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| - | }
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| - | });
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| - | erro.connect(new Button.Clicked() {
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| - | public void onClicked(Button button) {
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| - | MessageDialog md = new MessageDialog (null, true,
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| - | MessageType.ERROR,
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| - | ButtonsType.CLOSE, "Error loading file");
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| - | md.setPosition(WindowPosition.CENTER);
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| - | md.run();
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| - | md.hide();
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| - | }
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| - | });
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| - | table.attach(info, 0, 1, 0, 1);
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| - | table.attach(warn, 1, 2, 0, 1);
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| - | table.attach(ques, 0, 1, 1, 2);
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| - | table.attach(erro, 1, 2, 1, 2);
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| - |
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| - | add(table);
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| - | }
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| - | public static void main(String[] args) {
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| - | Gtk.init(args);
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| - | new GMessages();
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| - | Gtk.main();
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| - | }
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| - | }
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| - | </source>
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| - | In our example, we will show four kinds of message dialogs.
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| - | Information, Warning, Question and Error message dialogs.
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| - | <source lang="java">
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| - | Button info = new Button("Information");
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| - | Button warn = new Button("Warning");
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| - | Button ques = new Button("Question");
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| - | Button erro = new Button("Error");
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| - | </source>
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| - | We have four buttons. Each of these buttons will show a different kind of message dialog.
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| - | <source lang="java">
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| - | info.connect(new Button.Clicked() {
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| - | public void onClicked(Button button) {
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| - | MessageDialog md = new MessageDialog(null, true,
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| - | MessageType.INFO,
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| - | ButtonsType.CLOSE, "Download completed");
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| - | md.setPosition(WindowPosition.CENTER);
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| - | md.run();
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| - | md.hide();
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| - | }
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| - | });
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| - | </source>
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| - | If we click on the info button, the Information dialog is displayed.
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| - | The <b>MessageType.INFO</b> specifies the type of the dialog. The <b>ButtonsType.CLOSE</b> specifies the button to be displayed in the dialog. The last parameter is the message dislayed.
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| - | The dialog is displayed with the <b>run()</b> method.
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| - | The <b>hide()</b> method hides the dialog.
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| - | [[image: Java_Gnome_faq_information.png| center]]
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| - | [[image: Java_Gnome_faq_warning.png| center]]
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| - | [[image: Java_Gnome_faq_question.png| center]]
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| - | [[image: Java_Gnome_faq_error.png| center]]
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| - | == AboutDialog ==
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| - | The <b>AboutDialog</b> can display a logo, the name of the application, version, copyright or licence information.
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| - | It is also possible to give credits to the authors or translators.
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| - | <source lang="java">
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| - | package com.zetcode;
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| - | import java.io.FileNotFoundException;
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| - | import org.gnome.gdk.Event;
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| - | import org.gnome.gdk.Pixbuf;
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| - | import org.gnome.gtk.AboutDialog;
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| - | import org.gnome.gtk.Button;
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| - | import org.gnome.gtk.Fixed;
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| - | import org.gnome.gtk.Gtk;
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| - | import org.gnome.gtk.Widget;
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| - | import org.gnome.gtk.Window;
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| - | import org.gnome.gtk.WindowPosition;
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| - | public class GAboutDialog extends Window implements Button.Clicked {
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| - | Pixbuf logo;
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| - | public GAboutDialog() {
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| - | setTitle("AboutDialog");
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| - | initUI();
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| - | connect(new Window.DeleteEvent() {
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| - | public boolean onDeleteEvent(Widget source, Event event) {
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| - | Gtk.mainQuit();
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| - | return false;
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| - | }
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| - | });
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| - | setDefaultSize(250, 200);
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| - | setPosition(WindowPosition.CENTER);
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| - | showAll();
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| - | }
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| - | public void initUI() {
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| - | try {
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| - | logo = new Pixbuf("battery.png");
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| - | } catch (FileNotFoundException e) {
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| - | e.printStackTrace();
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| - | }
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| - | Button button = new Button("About");
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| - | button.connect(this);
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| - |
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| - | Fixed fix = new Fixed();
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| - | fix.put(button, 20, 20);
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| - | add(fix);
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| - | }
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| - | public void onClicked(Button button) {
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| - | AboutDialog about = new AboutDialog();
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| - | about.setProgramName("Battery");
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| - | about.setVersion("0.1");
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| - | about.setCopyright("(c) Jan Bodnar");
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| - | about.setComments("Battery is a simple tool for battery checking");
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| - | about.setLogo(logo);
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| - | about.setPosition(WindowPosition.CENTER);
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| - | about.run();
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| - | about.hide();
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| - | }
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| - | public static void main(String[] args) {
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| - | Gtk.init(args);
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| - | new GAboutDialog();
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| - | Gtk.main();
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| - | }
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| - | }
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| - | </source>
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| - | The code example uses a <b>AboutDialog</b> with some of it's features.
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| - |
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| - | <source lang="java">
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| - | AboutDialog about = new AboutDialog();
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| - | </source>
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| - | We create an <b>AboutDialog</b>.
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| - |
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| - | <source lang="java">
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| - | about.setProgramName("Battery");
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| - | about.setVersion("0.1");
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| - | about.setCopyright("(c) Jan Bodnar");
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| - | </source>
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| - | We set the name, version and the copyright.
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| - | <source lang="java">
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| - | about.setLogo(logo);
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| - | </source>
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| - | This line creates a logo.
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| - | [[image: Java_Gnome_faq_battery.png| center]]
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| - |
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| - | [[Категория:GTK+]]
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| - | [[Категория:Java]]
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