ref: 9eaba52cafcac7c2f3bfc72d7be1f15893196be1
dir: /DoConfig/fltk/src/Fl_Scrollbar.cxx/
//
// "$Id$"
//
// Scroll bar 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_Scrollbar.H>
#include <FL/fl_draw.H>
#include <math.h>
#include "flstring.h"
#define INITIALREPEAT .5
#define REPEAT .05
void Fl_Scrollbar::increment_cb() {
char inv = maximum()<minimum();
int ls = inv ? -linesize_ : linesize_;
int i;
switch (pushed_) {
case 1: // clicked on arrow left
i = -ls;
break;
default: // clicked on arrow right
i = ls;
break;
case 5: // clicked into the box next to the slider on the left
i = -(int((maximum()-minimum())*slider_size()/(1.0-slider_size())));
if (inv) {
if (i<-ls) i = -ls;
} else {
if (i>-ls) i = -ls; // err
}
break;
case 6: // clicked into the box next to the slider on the right
i = (int((maximum()-minimum())*slider_size()/(1.0-slider_size())));
if (inv) {
if (i>ls) i = ls;
} else {
if (i<ls) i = ls; // err
}
break;
}
handle_drag(clamp(value() + i));
}
void Fl_Scrollbar::timeout_cb(void* v) {
Fl_Scrollbar* s = (Fl_Scrollbar*)v;
s->increment_cb();
Fl::add_timeout(REPEAT, timeout_cb, s);
}
int Fl_Scrollbar::handle(int event) {
// area of scrollbar:
int area;
int X=x(); int Y=y(); int W=w(); int H=h();
// adjust slider area to be inside the arrow buttons:
if (horizontal()) {
if (W >= 3*H) {X += H; W -= 2*H;}
} else {
if (H >= 3*W) {Y += W; H -= 2*W;}
}
// which widget part is highlighted?
int relx;
int ww;
if (horizontal()) {
relx = Fl::event_x()-X;
ww = W;
} else {
relx = Fl::event_y()-Y;
ww = H;
}
if (relx < 0) area = 1;
else if (relx >= ww) area = 2;
else {
int 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;
double val =
(maximum()-minimum()) ? (value()-minimum())/(maximum()-minimum()) : 0.5;
int sliderx;
if (val >= 1.0) sliderx = ww-S;
else if (val <= 0.0) sliderx = 0;
else sliderx = int(val*(ww-S)+.5);
if (Fl::event_button() == FL_MIDDLE_MOUSE) area = 8;
else if (relx < sliderx) area = 5;
else if (relx >= sliderx+S) area = 6;
else area = 8;
}
switch (event) {
case FL_ENTER:
case FL_LEAVE:
return 1;
case FL_RELEASE:
damage(FL_DAMAGE_ALL);
if (pushed_) {
Fl::remove_timeout(timeout_cb, this);
pushed_ = 0;
}
handle_release();
return 1;
case FL_PUSH:
if (pushed_) return 1;
if (area != 8) pushed_ = area;
if (pushed_) {
handle_push();
Fl::add_timeout(INITIALREPEAT, timeout_cb, this);
increment_cb();
damage(FL_DAMAGE_ALL);
return 1;
}
return Fl_Slider::handle(event, X,Y,W,H);
case FL_DRAG:
if (pushed_) return 1;
return Fl_Slider::handle(event, X,Y,W,H);
case FL_MOUSEWHEEL :
if (horizontal()) {
if (Fl::e_dx==0) return 0;
int ls = maximum()>=minimum() ? linesize_ : -linesize_;
handle_drag(clamp(value() + ls * Fl::e_dx));
return 1;
} else {
if (Fl::e_dy==0) return 0;
int ls = maximum()>=minimum() ? linesize_ : -linesize_;
handle_drag(clamp(value() + ls * Fl::e_dy));
return 1;
}
case FL_SHORTCUT:
case FL_KEYBOARD: {
int v = value();
int ls = maximum()>=minimum() ? linesize_ : -linesize_;
if (horizontal()) {
switch (Fl::event_key()) {
case FL_Left:
v -= ls;
break;
case FL_Right:
v += ls;
break;
default:
return 0;
}
} else { // vertical
switch (Fl::event_key()) {
case FL_Up:
v -= ls;
break;
case FL_Down:
v += ls;
break;
case FL_Page_Up:
if (slider_size() >= 1.0) return 0;
v -= int((maximum()-minimum())*slider_size()/(1.0-slider_size()));
v += ls;
break;
case FL_Page_Down:
if (slider_size() >= 1.0) return 0;
v += int((maximum()-minimum())*slider_size()/(1.0-slider_size()));
v -= ls;
break;
case FL_Home:
v = int(minimum());
break;
case FL_End:
v = int(maximum());
break;
default:
return 0;
}
}
v = int(clamp(v));
if (v != value()) {
Fl_Slider::value(v);
value_damage();
set_changed();
do_callback();
}
return 1;}
}
return 0;
}
void Fl_Scrollbar::draw() {
if (damage()&FL_DAMAGE_ALL) draw_box();
int X = x()+Fl::box_dx(box());
int Y = y()+Fl::box_dy(box());
int W = w()-Fl::box_dw(box());
int H = h()-Fl::box_dh(box());
if (horizontal()) {
if (W < 3*H) {Fl_Slider::draw(X,Y,W,H); return;}
Fl_Slider::draw(X+H,Y,W-2*H,H);
if (damage()&FL_DAMAGE_ALL) {
draw_box((pushed_==1) ? fl_down(slider()) : slider(),
X, Y, H, H, selection_color());
draw_box((pushed_==2) ? fl_down(slider()) : slider(),
X+W-H, Y, H, H, selection_color());
if (active_r())
fl_color(labelcolor());
else
fl_color(fl_inactive(labelcolor()));
int w1 = (H-4)/3; if (w1 < 1) w1 = 1;
int x1 = X+(H-w1-1)/2;
int yy1 = Y+(H-2*w1-1)/2;
if (Fl::is_scheme("gtk+")) {
fl_polygon(x1, yy1+w1, x1+w1, yy1+2*w1, x1+w1-1, yy1+w1, x1+w1, yy1);
x1 += (W-H);
fl_polygon(x1, yy1, x1+1, yy1+w1, x1, yy1+2*w1, x1+w1, yy1+w1);
} else {
fl_polygon(x1, yy1+w1, x1+w1, yy1+2*w1, x1+w1, yy1);
x1 += (W-H);
fl_polygon(x1, yy1, x1, yy1+2*w1, x1+w1, yy1+w1);
}
}
} else { // vertical
if (H < 3*W) {Fl_Slider::draw(X,Y,W,H); return;}
Fl_Slider::draw(X,Y+W,W,H-2*W);
if (damage()&FL_DAMAGE_ALL) {
draw_box((pushed_==1) ? fl_down(slider()) : slider(),
X, Y, W, W, selection_color());
draw_box((pushed_==2) ? fl_down(slider()) : slider(),
X, Y+H-W, W, W, selection_color());
if (active_r())
fl_color(labelcolor());
else
fl_color(fl_inactive(labelcolor()));
int w1 = (W-4)/3; if (w1 < 1) w1 = 1;
int x1 = X+(W-2*w1-1)/2;
int yy1 = Y+(W-w1-1)/2;
if (Fl::is_scheme("gtk+")) {
fl_polygon(x1, yy1+w1, x1+w1, yy1+w1-1, x1+2*w1, yy1+w1, x1+w1, yy1);
yy1 += H-W;
fl_polygon(x1, yy1, x1+w1, yy1+1, x1+w1, yy1+w1);
fl_polygon(x1+w1, yy1+1, x1+2*w1, yy1, x1+w1, yy1+w1);
} else {
fl_polygon(x1, yy1+w1, x1+2*w1, yy1+w1, x1+w1, yy1);
yy1 += H-W;
fl_polygon(x1, yy1, x1+w1, yy1+w1, x1+2*w1, yy1);
}
}
}
}
/**
Creates a new Fl_Scrollbar widget with given position, size, and label.
You need to do type(FL_HORIZONTAL) if you want a horizontal scrollbar.
*/
Fl_Scrollbar::Fl_Scrollbar(int X, int Y, int W, int H, const char* L)
: Fl_Slider(X, Y, W, H, L) {
box(FL_FLAT_BOX);
color(FL_DARK2);
slider(FL_UP_BOX);
linesize_ = 16;
pushed_ = 0;
step(1);
}
/** Destroys the Scrollbar. */
Fl_Scrollbar::~Fl_Scrollbar() {
if (pushed_)
Fl::remove_timeout(timeout_cb, this);
}
//
// End of "$Id$".
//