fltk::Scrollbar Class Reference

Inherits fltk::Slider.

List of all members.

Public Member Functions

int handle (int)
void pagesize (int a)
int pagesize () const
 Scrollbar (int x, int y, int w, int h, const char *l=0)
bool value (int position, int size, int top, int total)
bool value (int position)
int value () const

Static Public Attributes

static NamedStyledefault_style

Protected Member Functions

void draw ()


Detailed Description

scrollbar.gif

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.


Member Function Documentation

bool 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.

References fltk::Rectangle::b(), fltk::Rectangle::h(), fltk::Symbol::inset(), fltk::Valuator::linesize(), fltk::Rectangle::r(), fltk::Widget::redraw(), fltk::Valuator::value(), fltk::Widget::vertical(), and fltk::Rectangle::w().

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.


Wed Jun 17 08:58:18 2009. FLTK ©2007 Bill Spitzak and others.
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