Scrollbar Class Reference

Inherits Slider.

List of all members.

Public Member Functions
	Scrollbar (int x, int y, int w, int h, const char *l=0)
int	value ()
int	value (int position, int size, int top, int total)
int	handle (int)
int	pagesize () const
void	pagesize (int a)
Static Public Attributes
NamedStyle *	default_style
Protected Member Functions
void	draw ()

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Detailed Description

The Scrollbar widget displays a slider with arrow buttons at the ends of the scrollbar. Clicking on the arrows move up/left and down/right by linesize(). If the scrollbar has the keyboard focus the arrows move by linesize(), and vertical scrollbars take Page Up/Down (they move by the page size minus linesize()) and Home/End (they jump to the top or bottom). Often a widget that takes focus such as the browser will just send keystrokes to the scrollbar directly to get it to move in response.

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Member Function Documentation

void Scrollbar::pagesize (  int  a  )  [inline]

How much the pageup/down keys and clicking in the empty area move by. If you call value() this is set to 1 linesize() less than the window.

int Scrollbar::value (  int  p, int  w, int  t, int  l )

Set the current position, the range, the pagesize, and the slider_size() all at once in a useful way. p = the position in the data of the first pixel in the window w = the size of the window t = the position of the top of your data (typically zero) l = the total size of your data.

int Scrollbar::value (   )  [inline]

Return the current position of the scrollbar as an integer. Scrollbars have step(1) preset (they always return integers). If desired you can set the step() to non-integer values. You will then have to use casts to get at the floating-point versions of value() from the Slider baseclass.

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The documentation for this class was generated from the following files:

• fltk/Scrollbar.h
• src/Scrollbar.cxx

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