ref: 9eaba52cafcac7c2f3bfc72d7be1f15893196be1
dir: /DoConfig/fltk/src/Fl_Slider.cxx/
//
// "$Id$"
//
// Slider widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2015 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <FL/Fl.H>
#include <FL/Fl_Slider.H>
#include <FL/Fl_Fill_Slider.H>
#include <FL/Fl_Hor_Slider.H>
#include <FL/Fl_Hor_Fill_Slider.H>
#include <FL/Fl_Hor_Nice_Slider.H>
#include <FL/Fl_Nice_Slider.H>
#include <FL/fl_draw.H>
#include <math.h>
#include "flstring.h"
void Fl_Slider::_Fl_Slider() {
slider_size_ = 0;
slider_ = 0; // FL_UP_BOX;
}
/**
Creates a new Fl_Slider widget using the given position,
size, and label string. The default boxtype is FL_DOWN_BOX.
*/
Fl_Slider::Fl_Slider(int X, int Y, int W, int H, const char* L)
: Fl_Valuator(X, Y, W, H, L) {
box(FL_DOWN_BOX);
_Fl_Slider();
}
/**
Creates a new Fl_Slider widget using the given type, position,
size, and label string.
*/
Fl_Slider::Fl_Slider(uchar t, int X, int Y, int W, int H, const char* L)
: Fl_Valuator(X, Y, W, H, L) {
type(t);
box(t==FL_HOR_NICE_SLIDER || t==FL_VERT_NICE_SLIDER ?
FL_FLAT_BOX : FL_DOWN_BOX);
_Fl_Slider();
}
void Fl_Slider::slider_size(double v) {
if (v < 0) v = 0;
if (v > 1) v = 1;
if (slider_size_ != float(v)) {
slider_size_ = float(v);
damage(FL_DAMAGE_EXPOSE);
}
}
/**
Sets the minimum (a) and maximum (b) values for the valuator widget.
if at least one of the values is changed, a partial redraw is asked.
*/
void Fl_Slider::bounds(double a, double b) {
if (minimum() != a || maximum() != b) {
Fl_Valuator::bounds(a, b);
damage(FL_DAMAGE_EXPOSE);
}
}
/**
Sets the size and position of the sliding knob in the box.
\param[in] pos position of first line displayed
\param[in] size size of window in lines
\param[in] first number of first line
\param[in] total total number of lines
Returns Fl_Valuator::value(p)
*/
int Fl_Slider::scrollvalue(int pos, int size, int first, int total) {
step(1, 1);
if (pos+size > first+total) total = pos+size-first;
slider_size(size >= total ? 1.0 : double(size)/double(total));
bounds(first, total-size+first);
return value(pos);
}
// All slider interaction is done as though the slider ranges from
// zero to one, and the left (bottom) edge of the slider is at the
// given position. Since when the slider is all the way to the
// right (top) the left (bottom) edge is not all the way over, a
// position on the widget itself covers a wider range than 0-1,
// actually it ranges from 0 to 1/(1-size).
void Fl_Slider::draw_bg(int X, int Y, int W, int H) {
fl_push_clip(X, Y, W, H);
draw_box();
fl_pop_clip();
Fl_Color black = active_r() ? FL_FOREGROUND_COLOR : FL_INACTIVE_COLOR;
if (type() == FL_VERT_NICE_SLIDER) {
draw_box(FL_THIN_DOWN_BOX, X+W/2-2, Y, 4, H, black);
} else if (type() == FL_HOR_NICE_SLIDER) {
draw_box(FL_THIN_DOWN_BOX, X, Y+H/2-2, W, 4, black);
}
}
void Fl_Slider::draw(int X, int Y, int W, int H) {
double val;
if (minimum() == maximum())
val = 0.5;
else {
val = (value()-minimum())/(maximum()-minimum());
if (val > 1.0) val = 1.0;
else if (val < 0.0) val = 0.0;
}
int ww = (horizontal() ? W : H);
int xx, S;
if (type()==FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) {
S = int(val*ww+.5);
if (minimum()>maximum()) {S = ww-S; xx = ww-S;}
else xx = 0;
} else {
S = int(slider_size_*ww+.5);
int T = (horizontal() ? H : W)/2+1;
if (type()==FL_VERT_NICE_SLIDER || type()==FL_HOR_NICE_SLIDER) T += 4;
if (S < T) S = T;
xx = int(val*(ww-S)+.5);
}
int xsl, ysl, wsl, hsl;
if (horizontal()) {
xsl = X+xx;
wsl = S;
ysl = Y;
hsl = H;
} else {
ysl = Y+xx;
hsl = S;
xsl = X;
wsl = W;
}
draw_bg(X, Y, W, H);
Fl_Boxtype box1 = slider();
if (!box1) {box1 = (Fl_Boxtype)(box()&-2); if (!box1) box1 = FL_UP_BOX;}
if (type() == FL_VERT_NICE_SLIDER) {
draw_box(box1, xsl, ysl, wsl, hsl, FL_GRAY);
int d = (hsl-4)/2;
draw_box(FL_THIN_DOWN_BOX, xsl+2, ysl+d, wsl-4, hsl-2*d,selection_color());
} else if (type() == FL_HOR_NICE_SLIDER) {
draw_box(box1, xsl, ysl, wsl, hsl, FL_GRAY);
int d = (wsl-4)/2;
draw_box(FL_THIN_DOWN_BOX, xsl+d, ysl+2, wsl-2*d, hsl-4,selection_color());
} else {
if (wsl>0 && hsl>0) draw_box(box1, xsl, ysl, wsl, hsl, selection_color());
if (type() != FL_HOR_FILL_SLIDER && type() != FL_VERT_FILL_SLIDER &&
Fl::is_scheme("gtk+")) {
if (W>H && wsl>(hsl+8)) {
// Draw horizontal grippers
int yy, hh;
hh = hsl-8;
xx = xsl+(wsl-hsl-4)/2;
yy = ysl+3;
fl_color(fl_darker(selection_color()));
fl_line(xx, yy+hh, xx+hh, yy);
fl_line(xx+6, yy+hh, xx+hh+6, yy);
fl_line(xx+12, yy+hh, xx+hh+12, yy);
xx++;
fl_color(fl_lighter(selection_color()));
fl_line(xx, yy+hh, xx+hh, yy);
fl_line(xx+6, yy+hh, xx+hh+6, yy);
fl_line(xx+12, yy+hh, xx+hh+12, yy);
} else if (H>W && hsl>(wsl+8)) {
// Draw vertical grippers
int yy;
xx = xsl+4;
ww = wsl-8;
yy = ysl+(hsl-wsl-4)/2;
fl_color(fl_darker(selection_color()));
fl_line(xx, yy+ww, xx+ww, yy);
fl_line(xx, yy+ww+6, xx+ww, yy+6);
fl_line(xx, yy+ww+12, xx+ww, yy+12);
yy++;
fl_color(fl_lighter(selection_color()));
fl_line(xx, yy+ww, xx+ww, yy);
fl_line(xx, yy+ww+6, xx+ww, yy+6);
fl_line(xx, yy+ww+12, xx+ww, yy+12);
}
}
}
draw_label(xsl, ysl, wsl, hsl);
if (Fl::focus() == this) {
if (type() == FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) draw_focus();
else draw_focus(box1, xsl, ysl, wsl, hsl);
}
}
void Fl_Slider::draw() {
if (damage()&FL_DAMAGE_ALL) draw_box();
draw(x()+Fl::box_dx(box()),
y()+Fl::box_dy(box()),
w()-Fl::box_dw(box()),
h()-Fl::box_dh(box()));
}
int Fl_Slider::handle(int event, int X, int Y, int W, int H) {
// Fl_Widget_Tracker wp(this);
switch (event) {
case FL_PUSH: {
Fl_Widget_Tracker wp(this);
if (!Fl::event_inside(X, Y, W, H)) return 0;
handle_push();
if (wp.deleted()) return 1; }
// fall through ...
case FL_DRAG: {
double val;
if (minimum() == maximum())
val = 0.5;
else {
val = (value()-minimum())/(maximum()-minimum());
if (val > 1.0) val = 1.0;
else if (val < 0.0) val = 0.0;
}
int ww = (horizontal() ? W : H);
int mx = (horizontal() ? Fl::event_x()-X : Fl::event_y()-Y);
int S;
static int offcenter;
if (type() == FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) {
S = 0;
if (event == FL_PUSH) {
int xx = int(val*ww+.5);
offcenter = mx-xx;
if (offcenter < -10 || offcenter > 10) offcenter = 0;
else return 1;
}
} else {
S = int(slider_size_*ww+.5); if (S >= ww) return 0;
int T = (horizontal() ? H : W)/2+1;
if (type()==FL_VERT_NICE_SLIDER || type()==FL_HOR_NICE_SLIDER) T += 4;
if (S < T) S = T;
if (event == FL_PUSH) {
int xx = int(val*(ww-S)+.5);
offcenter = mx-xx;
if (offcenter < 0) offcenter = 0;
else if (offcenter > S) offcenter = S;
else return 1;
}
}
int xx = mx-offcenter;
double v = 0;
char tryAgain = 1;
while (tryAgain)
{
tryAgain = 0;
if (xx < 0) {
xx = 0;
offcenter = mx; if (offcenter < 0) offcenter = 0;
} else if (xx > (ww-S)) {
xx = ww-S;
offcenter = mx-xx; if (offcenter > S) offcenter = S;
}
v = round(xx*(maximum()-minimum())/(ww-S) + minimum());
// make sure a click outside the sliderbar moves it:
if (event == FL_PUSH && v == value()) {
offcenter = S/2;
event = FL_DRAG;
tryAgain = 1;
}
}
handle_drag(clamp(v));
} return 1;
case FL_RELEASE:
handle_release();
return 1;
case FL_KEYBOARD:
{ Fl_Widget_Tracker wp(this);
switch (Fl::event_key()) {
case FL_Up:
if (horizontal()) return 0;
handle_push();
if (wp.deleted()) return 1;
handle_drag(clamp(increment(value(),-1)));
if (wp.deleted()) return 1;
handle_release();
return 1;
case FL_Down:
if (horizontal()) return 0;
handle_push();
if (wp.deleted()) return 1;
handle_drag(clamp(increment(value(),1)));
if (wp.deleted()) return 1;
handle_release();
return 1;
case FL_Left:
if (!horizontal()) return 0;
handle_push();
if (wp.deleted()) return 1;
handle_drag(clamp(increment(value(),-1)));
if (wp.deleted()) return 1;
handle_release();
return 1;
case FL_Right:
if (!horizontal()) return 0;
handle_push();
if (wp.deleted()) return 1;
handle_drag(clamp(increment(value(),1)));
if (wp.deleted()) return 1;
handle_release();
return 1;
default:
return 0;
}
}
// break not required because of switch...
case FL_FOCUS :
case FL_UNFOCUS :
if (Fl::visible_focus()) {
redraw();
return 1;
} else return 0;
case FL_ENTER :
case FL_LEAVE :
return 1;
default:
return 0;
}
}
int Fl_Slider::handle(int event) {
if (event == FL_PUSH && Fl::visible_focus()) {
Fl::focus(this);
redraw();
}
return handle(event,
x()+Fl::box_dx(box()),
y()+Fl::box_dy(box()),
w()-Fl::box_dw(box()),
h()-Fl::box_dh(box()));
}
Fl_Fill_Slider::Fl_Fill_Slider(int X,int Y,int W,int H,const char *L)
: Fl_Slider(X,Y,W,H,L)
{
type(FL_VERT_FILL_SLIDER);
}
Fl_Hor_Slider::Fl_Hor_Slider(int X,int Y,int W,int H,const char *l)
: Fl_Slider(X,Y,W,H,l) {
type(FL_HOR_SLIDER);
}
Fl_Hor_Fill_Slider::Fl_Hor_Fill_Slider(int X,int Y,int W,int H,const char *L)
: Fl_Slider(X,Y,W,H,L)
{
type(FL_HOR_FILL_SLIDER);
}
Fl_Hor_Nice_Slider::Fl_Hor_Nice_Slider(int X,int Y,int W,int H,const char *L)
: Fl_Slider(X,Y,W,H,L)
{
type(FL_HOR_NICE_SLIDER);
box(FL_FLAT_BOX);
}
Fl_Nice_Slider::Fl_Nice_Slider(int X,int Y,int W,int H,const char *L)
: Fl_Slider(X,Y,W,H,L) {
type(FL_VERT_NICE_SLIDER);
box(FL_FLAT_BOX);
}
//
// End of "$Id$".
//