// This example is from _Java Examples in a Nutshell_. (http://www.oreilly.com) // Copyright (c) 1997 by David Flanagan // This example is provided WITHOUT ANY WARRANTY either expressed or implied. // You may study, use, modify, and distribute it for non-commercial purposes. // For any commercial use, see http://www.davidflanagan.com/javaexamples import java.awt.*; import java.awt.event.*; /** A program that uses all the standard AWT components */ public class AllComponents extends Frame implements ActionListener { TextArea textarea; // Events messages will be displayed here. /** Create the whole GUI, and set up event listeners */ public AllComponents(String title) { super(title); // set frame title. // Arrange to detect window close events this.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); // Set a default font this.setFont(new Font("SansSerif", Font.PLAIN, 12)); // Create the menubar. Tell the frame about it. MenuBar menubar = new MenuBar(); this.setMenuBar(menubar); // Create the file menu. Add to menubar. Menu file = new Menu("File"); menubar.add(file); // Create two items for the file menu, setting their label, shortcut, // action command and listener. Add them to File menu. // Note that we use the frame itself as the action listener MenuItem open = new MenuItem("Open", new MenuShortcut(KeyEvent.VK_O)); open.setActionCommand("open"); open.addActionListener(this); file.add(open); MenuItem quit = new MenuItem("Quit", new MenuShortcut(KeyEvent.VK_Q)); quit.setActionCommand("quit"); quit.addActionListener(this); file.add(quit); // Create Help menu; add an item; add to menubar // Display the help menu in a special reserved place. Menu help = new Menu("Help"); menubar.add(help); menubar.setHelpMenu(help); // Create and add an item to the Help menu MenuItem about = new MenuItem("About", new MenuShortcut(KeyEvent.VK_A)); about.setActionCommand("about"); about.addActionListener(this); help.add(about); // Now that we've done the menu, we can begin work on the contents of // the frame. Assign a BorderLayout manager with margins for this frame. this.setLayout(new BorderLayout(10, 10)); // Create two panels to contain two columns of components. Use our custom // ColumnLayout layout manager for each. Add them on the west and // center of the frame's border layout Panel column1 = new Panel(); column1.setLayout(new ColumnLayout(5, 10, 2, ColumnLayout.LEFT)); this.add(column1, "West"); Panel column2 = new Panel(); column2.setLayout(new ColumnLayout(5, 10, 2, ColumnLayout.LEFT)); this.add(column2, "Center"); // Create a panel to contain the buttons at the bottom of the window // Give it a FlowLayout layout manager, and add it along the south border Panel buttonbox = new Panel(); buttonbox.setLayout(new FlowLayout(FlowLayout.CENTER, 100, 10)); this.add(buttonbox, "South"); // Create pushbuttons and add them to the buttonbox Button okay = new Button("Okay"); Button cancel = new Button("Cancel"); buttonbox.add(okay); buttonbox.add(cancel); // Handle events on the buttons ActionListener buttonlistener = new ActionListener() { public void actionPerformed(ActionEvent e) { textarea.append("You clicked: " + ((Button)e.getSource()).getLabel() + "\n"); } }; okay.addActionListener(buttonlistener); cancel.addActionListener(buttonlistener); // Now start filling the left column. // Create a 1-line text field and add to left column, with a label TextField textfield = new TextField(15); column1.add(new Label("Name:")); column1.add(textfield); // Handle events on the TextField textfield.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { textarea.append("Your name is: " + ((TextField)e.getSource()).getText() + "\n"); } }); textfield.addTextListener(new TextListener() { public void textValueChanged(TextEvent e) { textarea.append("You have typed: " + ((TextField)e.getSource()).getText() + "\n"); } }); // Create a dropdown list or option menu of choices Choice choice = new Choice(); choice.addItem("red"); choice.addItem("green"); choice.addItem("blue"); column1.add(new Label("Favorite color:")); column1.add(choice); // Handle events on this choice choice.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { textarea.append("Your favorite color is: " + e.getItem() + "\n"); } }); // Create checkboxes, and group them in a CheckboxGroup to give them // "radio button" behavior. CheckboxGroup checkbox_group = new CheckboxGroup(); Checkbox[] checkboxes = new Checkbox[3]; checkboxes[0] = new Checkbox("vanilla", checkbox_group, false); checkboxes[1] = new Checkbox("chocolate", checkbox_group, true); checkboxes[2] = new Checkbox("strawberry", checkbox_group, false); column1.add(new Label("Favorite flavor:")); for(int i = 0; i < checkboxes.length; i++) column1.add(checkboxes[i]); // Handle events on the checkboxes ItemListener checkbox_listener = new ItemListener() { public void itemStateChanged(ItemEvent e) { textarea.append("Your favorite flavor is: " + ((Checkbox)e.getItemSelectable()).getLabel() + "\n"); } }; for(int i = 0; i < checkboxes.length; i++) checkboxes[i].addItemListener(checkbox_listener); // Create a list of choices. List list = new List(4, true); list.addItem("Java"); list.addItem("C"); list.addItem("C++"); list.addItem("Smalltalk"); list.addItem("Lisp"); list.addItem("Modula-3"); list.addItem("Forth"); column1.add(new Label("Favorite languages:")); column1.add(list); // Handle events on this list list.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { textarea.append("Your favorite languages are: "); String[] languages = ((List)e.getItemSelectable()).getSelectedItems(); for(int i = 0; i < languages.length; i++) { if (i > 0) textarea.append(","); textarea.append(languages[i]); } textarea.append("\n"); } }); // Create a multi-line text area in column 2 textarea = new TextArea(6, 40); textarea.setEditable(false); column2.add(new Label("Messages")); column2.add(textarea); // Create a scrollpane that displays portions of a larger component ScrollPane scrollpane = new ScrollPane(); scrollpane.setSize(300, 150); column2.add(new Label("Scrolling Window")); column2.add(scrollpane); // Create a custom MultiLineLabel with a really big font and make it // a child of the ScrollPane container String message = "/*************************************************\n" + " * AllComponents.java *\n" + " * Written by David Flanagan *\n" + " * Copyright (c) 1997 by O'Reilly & Associates *\n" + " * *\n" + " *************************************************/\n"; MultiLineLabel biglabel = new MultiLineLabel(message); biglabel.setFont(new Font("Monospaced", Font.BOLD + Font.ITALIC, 24)); scrollpane.add(biglabel); } /** This is the action listener method that the menu items invoke */ public void actionPerformed(ActionEvent e) { String command = e.getActionCommand(); if (command.equals("quit")) { YesNoDialog d = new YesNoDialog(this, "Really Quit?", "Are you sure you want to quit?", "Yes", "No", null); d.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("yes")) System.exit(0); else textarea.append("Quit not confirmed\n"); } }); d.show(); } else if (command.equals("open")) { FileDialog d = new FileDialog(this, "Open File", FileDialog.LOAD); d.show(); // display the dialog and block until answered textarea.append("You selected file: " + d.getFile() + "\n"); d.dispose(); } else if (command.equals("about")) { InfoDialog d = new InfoDialog(this, "About", "This demo was written by David Flanagan\n" + "Copyright (c) 1997 O'Reilly & Associates"); d.show(); } } public static void main(String[] args) { Frame f = new AllComponents("AWT Demo"); f.pack(); f.show(); } }