Mar 7 Thr. Class Notes

	Inner /Anonymous class
    GUI Design
  How to create Menu
  Lab (30pts)
Dimension class

  Creates an instance of Dimension with a width of zero and a height of zero.
Dimension(Dimension d) 
  Creates an instance of Dimension whose width and height are the same as for 
  the specified dimension.
Dimension (int width, int height)
  Constructs a Dimension and initializes it to the specified width and 
  specified height.

Dimension getSize();
For Example:
to get a button size
Dimension d = btn.getSize();
int btnW = (int)d.getWidth();
int btnH = (int)d.getHeight(); 

Point class

  Constructs and initializes a point at the origin (0, 0) of the 
  coordinate space.
Point (int x, int y)
  Constructs and initializes a point at the specified (x, y) location 
  in the coordinate space.
Point (Point p) 
  Constructs and initializes a point with the same location as the 
  specified Point object.
Point getLocation()

For example:
to set a location of a button

Font class

public Font(String fontName, int style, int size);


Font.BOLD, Font.ITALIC, Font.PLAIN….

Size: point (1/72 inch) 

void setFont(Font f);//button or label text, applet

setFont(new Font(“fontName”, Font.BOLD, 24));

Logical fonts are the five font families defined by the Java 
platform which must be supported by any Java runtime environment(JRE): 

1. Serif 
2. SansSerif
3. Monospaced 
4. Dialog 
5. DialogInput

AWT: Label and TextField can only use logical fonts

FontMetrics class

public FontMetrics(Font f);

public int getLeading()
public int getAscent()
public int getDescent()
public int getHeight()
public int getMaxAscent()
public int getMaxDescent()

Java Pull-Down Menu

All items in a menu must belong to the class MenuItem, or 
one of its subclasses. 

Steps for creating a menu sytem
1. create a menu bar and attach it to the frame
2. create and populate the menu
3. attach the menu to the menu bar. 

public void actionPerformed(ActionEvent ae) {
      if(ae.getSource()==menuSave) {}
      else if(ae.getSource()==menuOpen) {}
      else {doSth() }

menuSave.addActionListener(ActionListener al)

implements ActionListener or use inner class or anonymous class

Menu(String label)
MenuItem(String label)
CheckboxMenuItem(String label)
CheckboxMenuItem(String label, boolean state)

How to:
1. Create a MenuBar
      MenuBar mbar = new MenuBar();
2. Create Menus.
      Menu file = new Menu(“File”);
3. Add MenuItem to Menu
      MenuItem open = new MenuItem(“Open”);
      file.add(open); //add actionListener() etc.
4. Add Menu to MenuBar
5. Attach MenuBar to a frame
    frame.setMenuBar(mbar);//associate frame to it
6. Add Separator
7. Add sub menu
     add another Menu with MenuItem to a Menu
8. Add Short Cut
     use MenuShortcut class

Lab: create a Color menu and add it to the existing menu system.

import java.awt.*;
import java.awt.event.*;
public class MyMenu extends Frame{    
	private MenuBar bar;
	private Menu file, help;	
	MyMenu(String title) {
	public static void main(String[] args) {
	    new MyMenu(“YourName’s Menu");