FileDocCategorySizeDatePackage
AllComponents.javaAPI DocExample7894Sat Jun 02 03:10:58 BST 2001None

AllComponents

public class AllComponents extends Frame

Fields Summary
MenuBar
menubar
Menu
file
Menu
help
Button
okay
Button
cancel
List
list
Choice
choice
CheckboxGroup
checkbox_group
Checkbox[]
checkboxes
TextField
textfield
TextArea
textarea
ScrollableScribble
scribble
FileDialog
file_dialog
Panel
panel1
Panel
panel2
Panel
buttonpanel
GridBagLayout
gridbag
Constructors Summary
public AllComponents(String title)

    
       
        super(title);
        
        // Create the menubar.  Tell the frame about it.
        menubar = new MenuBar();
        this.setMenuBar(menubar);
        // Create the file menu.  Add two items to it.  Add to menubar.
        file = new Menu("File");
        file.add(new MenuItem("Open"));
        file.add(new MenuItem("Quit"));
        menubar.add(file);
        // Create Help menu; add an item; add to menubar
        help = new Menu("Help");
        help.add(new MenuItem("About"));
        menubar.add(help);
        // Display the help menu in a special reserved place.
        menubar.setHelpMenu(help);
        
        // Create pushbuttons
        okay = new Button("Okay");
        cancel = new Button("Cancel");
        
        // Create a menu of choices
        choice = new Choice();
        choice.addItem("red");
        choice.addItem("green");
        choice.addItem("blue");
        
        // Create checkboxes, and group them.
        checkbox_group = new CheckboxGroup();
        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);
        
        // Create a list of choices.
        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");
        
        // Create a one-line text field, and multi-line text area.
        textfield = new TextField(15);
        textarea = new TextArea(6, 40);
        textarea.setEditable(false);
        
        // Create a scrolling canvas to scribble in. 
        scribble = new ScrollableScribble();
        
        // Create a file selection dialog box
        file_dialog = new FileDialog(this, "Open File", FileDialog.LOAD);
        
        // Create a Panel to contain all the components along the
        // left hand side of the window.  Use a GridBagLayout for it.
        panel1 = new Panel();
        panel1.setLayout(gridbag);
        
        // Use several versions of the constrain() convenience method
        // to add components to the panel and to specify their 
        // GridBagConstraints values.
        constrain(panel1, new Label("Name:"), 0, 0, 1, 1);
        constrain(panel1, textfield, 0, 1, 1, 1);
        constrain(panel1, new Label("Favorite color:"), 0, 2, 1, 1, 
              10, 0, 0, 0);
        constrain(panel1, choice, 0, 3, 1, 1);
        constrain(panel1, new Label("Favorite flavor:"), 0, 4, 1, 1, 
              10, 0, 0, 0);
        constrain(panel1, checkboxes[0], 0, 5, 1, 1);
        constrain(panel1, checkboxes[1], 0, 6, 1, 1);
        constrain(panel1, checkboxes[2], 0, 7, 1, 1);
        constrain(panel1, new Label("Favorite languages:"), 0, 8, 1, 1,
              10, 0, 0, 0);
        constrain(panel1, list, 0, 9, 1, 3, GridBagConstraints.VERTICAL,
              GridBagConstraints.NORTHWEST, 0.0, 1.0, 0, 0, 0, 0);
        
        // Create a panel for the items along the right side.
        // Use a GridBagLayout, and arrange items with constrain(), as above.
        panel2 = new Panel();
        panel2.setLayout(gridbag);
        
        constrain(panel2, new Label("Messages"), 0, 0, 1, 1);
        constrain(panel2, textarea, 0, 1, 1, 3, GridBagConstraints.HORIZONTAL,
              GridBagConstraints.NORTH, 1.0, 0.0, 0, 0, 0, 0);
        constrain(panel2, new Label("Diagram"), 0, 4, 1, 1, 10, 0, 0, 0);
        constrain(panel2, scribble, 0, 5, 1, 5, GridBagConstraints.BOTH,
              GridBagConstraints.CENTER, 1.0, 1.0, 0, 0, 0, 0);
        
        // Do the same for the buttons along the bottom.
        buttonpanel = new Panel();
        buttonpanel.setLayout(gridbag);
        constrain(buttonpanel, okay, 0, 0, 1, 1, GridBagConstraints.NONE,
              GridBagConstraints.CENTER, 0.3, 0.0, 0, 0, 0, 0);
        constrain(buttonpanel, cancel, 1, 0, 1, 1, GridBagConstraints.NONE,
              GridBagConstraints.CENTER, 0.3, 0.0, 0, 0, 0, 0);
        
        // Finally, use a GridBagLayout to arrange the panels themselves
        this.setLayout(gridbag);
        // And add the panels to the toplevel window
        constrain(this, panel1, 0, 0, 1, 1, GridBagConstraints.VERTICAL, 
              GridBagConstraints.NORTHWEST, 0.0, 1.0, 10, 10, 5, 5);
        constrain(this, panel2, 1, 0, 1, 1, GridBagConstraints.BOTH,
              GridBagConstraints.CENTER, 1.0, 1.0, 10, 10, 5, 10);
        constrain(this, buttonpanel, 0, 1, 2, 1, GridBagConstraints.HORIZONTAL,
              GridBagConstraints.CENTER, 1.0, 0.0, 5, 0, 0, 0);
    
Methods Summary
public voidconstrain(java.awt.Container container, java.awt.Component component, int grid_x, int grid_y, int grid_width, int grid_height, int fill, int anchor, double weight_x, double weight_y, int top, int left, int bottom, int right)

        GridBagConstraints c = new GridBagConstraints();
        c.gridx = grid_x; c.gridy = grid_y;
        c.gridwidth = grid_width; c.gridheight = grid_height;
        c.fill = fill; c.anchor = anchor;
        c.weightx = weight_x; c.weighty = weight_y;
        if (top+bottom+left+right > 0)
            c.insets = new Insets(top, left, bottom, right);
        
        ((GridBagLayout)container.getLayout()).setConstraints(component, c);
        container.add(component);
    
public voidconstrain(java.awt.Container container, java.awt.Component component, int grid_x, int grid_y, int grid_width, int grid_height)

        constrain(container, component, grid_x, grid_y, 
              grid_width, grid_height, GridBagConstraints.NONE, 
              GridBagConstraints.NORTHWEST, 0.0, 0.0, 0, 0, 0, 0);
    
public voidconstrain(java.awt.Container container, java.awt.Component component, int grid_x, int grid_y, int grid_width, int grid_height, int top, int left, int bottom, int right)

        constrain(container, component, grid_x, grid_y, 
              grid_width, grid_height, GridBagConstraints.NONE, 
              GridBagConstraints.NORTHWEST, 
              0.0, 0.0, top, left, bottom, right);
    
public static voidmain(java.lang.String[] args)

        Frame f = new AllComponents("AWT Demo");
        // We should call f.pack() here.  But its buggy.
        f.resize(450, 475);
        f.show();