brf.j2me.dynaworks.ui
Class BasicWidget

java.lang.Object
  |
  +--brf.j2me.dynaworks.ui.BasicWidget

All Implemented Interfaces:

UserWidget

Direct Known Subclasses:

Button, CheckBox, ComboBox, ListBox, RadioButton, ScrollBar, Slider, TextBox, TextField, Tree

public abstract class BasicWidget

extends java.lang.Object

implements UserWidget

Basic implementation of a UserWidget.

This class can be used (extended) for many custom controls.

Version:

1.0

Author:

Bernd R. Fix

See Also:

UserWidget

Field Summary

protected static Graphics	g static reference to the graphics canvas.
protected int	h height (in pixel) of the control.
protected int	w width (in pixel) of the control.
protected int	x x-coordinate of the upper-left corner.
protected int	y y-coordinate of the upper-left corner.

Constructor Summary

BasicWidget()

Method Summary

(package private) static void	()
boolean	contains(int xc, int yc) check if point is inside the widget
ActionEvent	handleKeyDown(int keyCode) Handle a "keyDown" event.
ActionEvent	handlePenDown(int xc, int yc) Handle a "pen down" event.
ActionEvent	handlePenMove(int xc, int yc) Handle a "pen move" event.
ActionEvent	handlePenUp(int xc, int yc) Handle a "pen up" event.
ActionEvent	handleSysKeyDown(int keyCode) Handle a "sysKeyDown" event.
boolean	hasFocus() Does the control have the focus?
void	loseFocus() control is losing the focus.
abstract void	paint() Paint the user control.
void	setFocus() set the focus on this control

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

x

protected int x

x-coordinate of the upper-left corner.

y

protected int y

y-coordinate of the upper-left corner.

w

protected int w

width (in pixel) of the control.

h

protected int h

height (in pixel) of the control.

g

protected static Graphics g

static reference to the graphics canvas.

Constructor Detail

BasicWidget

public BasicWidget()

Method Detail

static void ()

contains

public boolean contains(int xc,
                        int yc)

check if point is inside the widget

Specified by:

contains in interface UserWidget

Parameters:

xc - int - x coordinate of check point.

yc - int - y coordinate of check point.

Returns:

boolean - point inside control?

setFocus

public void setFocus()

set the focus on this control

Specified by:

setFocus in interface UserWidget

hasFocus

public boolean hasFocus()

Does the control have the focus?

Specified by:

hasFocus in interface UserWidget

Returns:

boolean - focus on this control?

loseFocus

public void loseFocus()

control is losing the focus.

Specified by:

loseFocus in interface UserWidget

handlePenDown

public ActionEvent handlePenDown(int xc,
                                 int yc)

Handle a "pen down" event. Return an ActionEvent if neccessary.

Specified by:

handlePenDown in interface UserWidget

Parameters:

xc - int - x coordinate of hit point.

yc - int - y coordinate of hit point.

Returns:

ActionEvent - event triggered by PenDown (or null).

See Also:

ActionEvent

handlePenMove

public ActionEvent handlePenMove(int xc,
                                 int yc)

Handle a "pen move" event. Return an ActionEvent if neccessary.

Specified by:

handlePenMove in interface UserWidget

Parameters:

xc - int - x coordinate of pen point.

yc - int - y coordinate of pen point.

Returns:

ActionEvent - event triggered by PenMove (or null).

See Also:

ActionEvent

handlePenUp

public ActionEvent handlePenUp(int xc,
                               int yc)

Handle a "pen up" event. Return an ActionEvent if neccessary.

Specified by:

handlePenUp in interface UserWidget

Parameters:

xc - int - x coordinate of pen point.

yc - int - y coordinate of pen point.

Returns:

ActionEvent - event triggered by PenUp (or null).

See Also:

ActionEvent

handleKeyDown

public ActionEvent handleKeyDown(int keyCode)

Handle a "keyDown" event. Return an ActionEvent if neccessary.

Specified by:

handleKeyDown in interface UserWidget

Parameters:

key - int - key send to the control.

Returns:

ActionEvent - event triggered by keyDown (or null).

See Also:

ActionEvent

handleSysKeyDown

public ActionEvent handleSysKeyDown(int keyCode)

Handle a "sysKeyDown" event. Return an ActionEvent if neccessary.

Specified by:

handleSysKeyDown in interface UserWidget

Parameters:

key - int - key send to the control.

Returns:

ActionEvent - event triggered by keyDown (or null).

See Also:

ActionEvent

paint

public abstract void paint()

Paint the user control.

Specified by:

paint in interface UserWidget