java.awt
Class Component

java.lang.Object
  |
  +--java.awt.Component

All Implemented Interfaces:

ImageObserver

Direct Known Subclasses:

Button, Canvas, Checkbox, Choice, Container, Label, List, Scrollbar, TextComponent

public abstract class Component

extends java.lang.Object

implements ImageObserver

Important Limitations:

• Only one listener of each type is allowed
• Many methods are still missing

Constructor Summary

Component()


Method Summary

void	addFocusListener(FocusListener l)
void	addKeyListener(KeyListener l)
void	addMouseListener(MouseListener l)
void	addMouseMotionListener(MouseMotionListener l)
boolean	contains(int x, int y)
void	dispatchEvent(AWTEvent event)
void	enableEvents(long mask) internal convenience method for drawing possibly focussed strings void drawFocusString (Graphics g, String text, int x, int y) { if (hasFocus) { FontMetrics fm = g.getFontMetrics (); g.fillRect (x, y, fm.stringWidth (text), fm.getHeight ()); Color c = g.getColor (); g.setColor (new Color (0x0ffffff ^ c.getRGB ())); g.drawString (text, x, y+fm.getAscent ()); g.setColor (c); } else g.drawString (text, x, y+fontMetrics.getAscent ()); }
Component	findComponentAt(int px, int py)
Color	getBackground()
Rectangle	getBounds()
Font	getFont()
FontMetrics	getFontMetrics(Font font)
Color	getForeground()
Graphics	getGraphics()
int	getHeight()
Point	getLocationOnScreen() return null if not visible
Dimension	getMaximumSize()
Dimension	getMinimumSize()
Container	getParent()
Dimension	getPreferredSize()
Dimension	getSize()
int	getWidth()
int	getX()
int	getY()
boolean	hasFocus()
void	invalidate()
boolean	isEnabled()
boolean	isFocusTraversable()
boolean	isValid()
boolean	isVisible()
void	paint(Graphics g)
void	paintAll(Graphics g)
void	processEvent(AWTEvent e) Processes the given event.
void	processFocusEvent(FocusEvent fe)
void	processKeyEvent(KeyEvent ke)
void	processMouseEvent(MouseEvent me)
void	processMouseMotionEvent(MouseEvent me)
void	repaint()
void	repaint(int rx, int ry, int rw, int rh)
void	requestFocus()
void	setBackground(Color c)
void	setBounds(int newX, int newY, int newW, int newH)
void	setEnabled(boolean b)
void	setFont(Font f)
void	setForeground(Color c) sets foreground color
void	setLocation(int x, int y)
void	setSize(Dimension d)
void	setSize(int w, int h)
void	setVisible(boolean v)
void	update(Graphics g)
void	validate()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Component

public Component()

Method Detail

addMouseListener

public void addMouseListener(MouseListener l)

addFocusListener

public void addFocusListener(FocusListener l)

addMouseMotionListener

public void addMouseMotionListener(MouseMotionListener l)

addKeyListener

public void addKeyListener(KeyListener l)

contains

public boolean contains(int x,
                        int y)

enableEvents

public void enableEvents(long mask)

internal convenience method for drawing possibly focussed strings void drawFocusString (Graphics g, String text, int x, int y) { if (hasFocus) { FontMetrics fm = g.getFontMetrics (); g.fillRect (x, y, fm.stringWidth (text), fm.getHeight ()); Color c = g.getColor (); g.setColor (new Color (0x0ffffff ^ c.getRGB ())); g.drawString (text, x, y+fm.getAscent ()); g.setColor (c); } else g.drawString (text, x, y+fontMetrics.getAscent ()); }

findComponentAt

public Component findComponentAt(int px,
                                 int py)

getBackground

public Color getBackground()

getBounds

public Rectangle getBounds()

getLocationOnScreen

public Point getLocationOnScreen()

return null if not visible

getFont

public Font getFont()

getFontMetrics

public FontMetrics getFontMetrics(Font font)

getForeground

public Color getForeground()

getGraphics

public Graphics getGraphics()

getMaximumSize

public Dimension getMaximumSize()

getSize

public Dimension getSize()

getX

public int getX()

getY

public int getY()

getWidth

public int getWidth()

getHeight

public int getHeight()

getPreferredSize

public Dimension getPreferredSize()

getMinimumSize

public Dimension getMinimumSize()

getParent

public Container getParent()

dispatchEvent

public void dispatchEvent(AWTEvent event)

hasFocus

public boolean hasFocus()

invalidate

public void invalidate()

isEnabled

public boolean isEnabled()

isVisible

public boolean isVisible()

isValid

public boolean isValid()

isFocusTraversable

public boolean isFocusTraversable()

processEvent

public void processEvent(AWTEvent e)

Processes the given event. Only active when a listener is registered or events are enabled by enableEvents ().

processFocusEvent

public void processFocusEvent(FocusEvent fe)

processKeyEvent

public void processKeyEvent(KeyEvent ke)

processMouseEvent

public void processMouseEvent(MouseEvent me)

processMouseMotionEvent

public void processMouseMotionEvent(MouseEvent me)

paint

public void paint(Graphics g)

paintAll

public void paintAll(Graphics g)

requestFocus

public void requestFocus()

repaint

public void repaint(int rx,
                    int ry,
                    int rw,
                    int rh)

repaint

public void repaint()

setBackground

public void setBackground(Color c)

setBounds

public void setBounds(int newX,
                      int newY,
                      int newW,
                      int newH)

setEnabled

public void setEnabled(boolean b)

setForeground

public void setForeground(Color c)

sets foreground color

setFont

public void setFont(Font f)

setLocation

public void setLocation(int x,
                        int y)

setSize

public void setSize(int w,
                    int h)

setSize

public void setSize(Dimension d)

update

public void update(Graphics g)

setVisible

public void setVisible(boolean v)

validate

public void validate()