palmed.edit.scrollbar
Class VerticalScrollbar

java.lang.Object
  palmed.edit.scrollbar.VerticalScrollbar

All Implemented Interfaces:

IDrawer, IScrollable, IScrollbar, IScrollView, IComponent

public final class VerticalScrollbar
extends java.lang.Object
implements IScrollbar, IScrollable, IDrawer, IScrollView, IComponent

This class provides a vertical scrollbar.

Version:

$Revision$ $Date$

Author:

Mathieu Champlon

Constructor Summary

VerticalScrollbar(IViewport viewport)
Create a vertical scrollbar.

Method Summary

boolean	click(int x, int y) Handle a click event.
void	drag(int x, int y) Handle a drag event.
void	drawArrow(javax.microedition.lcdui.Graphics g, int end, int from, int to) Draw an arrow.
void	drawBackground(javax.microedition.lcdui.Graphics g, int size, int width) Draw the background.
void	drawBody(javax.microedition.lcdui.Graphics g, int start, int end, int from, int to) Draw the body.
void	drawCursor(javax.microedition.lcdui.Graphics g, int start, int width, int from, int length) Draw the cursor.
int	getHeight() Retrieve the current height.
int	getLayout() Retrieve the layout.
int	getWidth() Retrieve the current width.
void	paint(javax.microedition.lcdui.Graphics g) Paint the component.
void	resize(int width, int height) Request a component resize.
void	scroll(int steps) Scroll the component.
void	scrolled(Coordinate position) The content has scrolled to the given position.
void	unclick(int x, int y) Handle an unclick event.
void	update(int visible, int max) Change the length of the cursor.

Methods inherited from class java.lang.Object

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

Constructor Detail

VerticalScrollbar

public VerticalScrollbar(IViewport viewport)

Create a vertical scrollbar.

Parameters:

viewport - the viewport to manage

Method Detail

paint

public void paint(javax.microedition.lcdui.Graphics g)

Paint the component.

Specified by:

paint in interface IComponent

Parameters:

g - the graphics

update

public void update(int visible,
                   int max)

Change the length of the cursor.

Specified by:

update in interface IScrollbar

Parameters:

visible - the number of visible elements

max - the total number of elements

resize

public void resize(int width,
                   int height)

Request a component resize.

Specified by:

resize in interface IComponent

Parameters:

width - the new width

height - the new height

click

public boolean click(int x,
                     int y)

Handle a click event.

Specified by:

click in interface IComponent

Parameters:

x - the pointer abscissa

y - the pointer ordinate

Returns:

whether the component claims focus or not

drag

public void drag(int x,
                 int y)

Handle a drag event.

The component must have claimed focus upon click in order to receive this event.

Specified by:

drag in interface IComponent

Parameters:

x - the pointer abscissa

y - the pointer ordinate

unclick

public void unclick(int x,
                    int y)

Handle an unclick event.

The component must have claimed focus upon click ini order to receive this event.

Specified by:

unclick in interface IComponent

Parameters:

x - the pointer abscissa

y - the pointer ordinate

scrolled

public void scrolled(Coordinate position)

The content has scrolled to the given position.

Specified by:

scrolled in interface IScrollView

Parameters:

position - the upper-left content position

scroll

public void scroll(int steps)

Scroll the component.

Specified by:

scroll in interface IScrollable

Parameters:

steps - the number of steps to scroll

drawArrow

public void drawArrow(javax.microedition.lcdui.Graphics g,
                      int end,
                      int from,
                      int to)

Draw an arrow.

Specified by:

drawArrow in interface IDrawer

Parameters:

g - the graphics

end - the offset where to end at perpendiculary of the axis of the scrollbar

from - the offset where to start at on the axis of the scrollbar

to - the offset where to end at on the axis of the scrollbar

drawBody

public void drawBody(javax.microedition.lcdui.Graphics g,
                     int start,
                     int end,
                     int from,
                     int to)

Draw the body.

Specified by:

drawBody in interface IDrawer

Parameters:

g - the graphics

start - the offset where to start at perpendiculary of the axis of the scrollbar

end - the offset where to end at perpendiculary of the axis of the scrollbar

from - the offset where to start at on the axis of the scrollbar

to - the offset where to end at on the axis of the scrollbar

drawCursor

public void drawCursor(javax.microedition.lcdui.Graphics g,
                       int start,
                       int width,
                       int from,
                       int length)

Draw the cursor.

Specified by:

drawCursor in interface IDrawer

Parameters:

g - the graphics

start - the offset to start at perpendiculary of the axis of the scrollbar

width - the width of the cursor

from - the offset to start at on the axis of the scrollbar

length - the length of the cursor

drawBackground

public void drawBackground(javax.microedition.lcdui.Graphics g,
                           int size,
                           int width)

Draw the background.

Specified by:

drawBackground in interface IDrawer

Parameters:

g - the graphics

size - the size of the scrollbar

width - the width of the scrollbar

getLayout

public int getLayout()

Retrieve the layout.

Supported layouts are :

• Item.LAYOUT_DEFAULT
• Item.LAYOUT_EXPAND
• Item.LAYOUT_VEXPAND

Specified by:

getLayout in interface IComponent

Returns:

a combination of layout flags

getWidth

public int getWidth()

Retrieve the current width.

Specified by:

getWidth in interface IComponent

Returns:

the width in pixels

getHeight

public int getHeight()

Retrieve the current height.

Specified by:

getHeight in interface IComponent

Returns:

the height in pixels