1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/goatkit/slider.cc	Wed Sep 23 05:44:58 2015 +0300
     1.3 @@ -0,0 +1,196 @@
     1.4 +/*
     1.5 +GoatKit - a themable/animated widget toolkit for games
     1.6 +Copyright (C) 2014  John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU Lesser General Public License as published by
    1.10 +the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU Lesser General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU Lesser General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +#include <stdio.h>
    1.22 +#include <math.h>
    1.23 +#include "slider.h"
    1.24 +#include "screen.h"
    1.25 +
    1.26 +namespace goatkit {
    1.27 +
    1.28 +struct SliderImpl {
    1.29 +	float value, prev_value;
    1.30 +	float range_min, range_max;
    1.31 +	float padding;
    1.32 +	float step;
    1.33 +	bool dragging;
    1.34 +	bool cont_change;
    1.35 +};
    1.36 +
    1.37 +static float remap(float val, float inlow, float inhigh, float outlow, float outhigh);
    1.38 +
    1.39 +Slider::Slider()
    1.40 +{
    1.41 +	slider = new SliderImpl;
    1.42 +	slider->value = slider->prev_value = 0.0f;
    1.43 +	slider->dragging = false;
    1.44 +	slider->cont_change = true;
    1.45 +
    1.46 +	slider->range_min = 0.0;
    1.47 +	slider->range_max = 1.0;
    1.48 +	slider->step = 0.0;
    1.49 +
    1.50 +	slider->padding = -1.0;
    1.51 +}
    1.52 +
    1.53 +Slider::~Slider()
    1.54 +{
    1.55 +	delete slider;
    1.56 +}
    1.57 +
    1.58 +const char *Slider::get_type_name() const
    1.59 +{
    1.60 +	return "slider";
    1.61 +}
    1.62 +
    1.63 +void Slider::set_value(float val)
    1.64 +{
    1.65 +	slider->value = remap(val, slider->range_min, slider->range_max, 0, 1);
    1.66 +}
    1.67 +
    1.68 +float Slider::get_value() const
    1.69 +{
    1.70 +	return remap(slider->value, 0, 1, slider->range_min, slider->range_max);
    1.71 +}
    1.72 +
    1.73 +void Slider::set_value_norm(float val)
    1.74 +{
    1.75 +	slider->value = val < 0.0 ? 0.0 : (val > 1.0 ? 1.0 : val);
    1.76 +}
    1.77 +
    1.78 +float Slider::get_value_norm() const
    1.79 +{
    1.80 +	return slider->value;
    1.81 +}
    1.82 +
    1.83 +void Slider::set_padding(float pad)
    1.84 +{
    1.85 +	slider->padding = pad;
    1.86 +}
    1.87 +
    1.88 +float Slider::get_padding() const
    1.89 +{
    1.90 +	if(slider->padding < 0.0) {
    1.91 +		BBox box = get_box();
    1.92 +		return (box.bmax.y - box.bmin.y) * 0.25;
    1.93 +	}
    1.94 +	return slider->padding;
    1.95 +}
    1.96 +
    1.97 +void Slider::set_continuous_change(bool cont)
    1.98 +{
    1.99 +	slider->cont_change = cont;
   1.100 +}
   1.101 +
   1.102 +bool Slider::get_continuous_change() const
   1.103 +{
   1.104 +	return slider->cont_change;
   1.105 +}
   1.106 +
   1.107 +void Slider::set_range(float min, float max)
   1.108 +{
   1.109 +	slider->range_min = min;
   1.110 +	slider->range_max = max;
   1.111 +}
   1.112 +
   1.113 +float Slider::get_range_min() const
   1.114 +{
   1.115 +	return slider->range_min;
   1.116 +}
   1.117 +
   1.118 +float Slider::get_range_max() const
   1.119 +{
   1.120 +	return slider->range_max;
   1.121 +}
   1.122 +
   1.123 +void Slider::set_step(float step)
   1.124 +{
   1.125 +	slider->step = step;
   1.126 +}
   1.127 +
   1.128 +float Slider::get_step() const
   1.129 +{
   1.130 +	return slider->step;
   1.131 +}
   1.132 +
   1.133 +void Slider::on_mouse_button(const ButtonEvent &ev)
   1.134 +{
   1.135 +	if(ev.button == 0) {
   1.136 +		Screen *scr = get_screen();
   1.137 +
   1.138 +		slider->dragging = ev.press;
   1.139 +		if(ev.press) {
   1.140 +			if(scr) scr->grab_mouse(this);
   1.141 +		} else {
   1.142 +			if(scr) scr->grab_mouse(0);
   1.143 +
   1.144 +			// on release, if the value has changed send the appropriate event
   1.145 +			if(slider->prev_value != slider->value) {
   1.146 +				Event ev;
   1.147 +				ev.type = EV_CHANGE;
   1.148 +				handle_event(ev);
   1.149 +				slider->prev_value = slider->value;
   1.150 +			}
   1.151 +		}
   1.152 +	}
   1.153 +}
   1.154 +
   1.155 +#define ROUND(x)	floor((x) + 0.5)
   1.156 +
   1.157 +void Slider::on_mouse_motion(const MotionEvent &ev)
   1.158 +{
   1.159 +	if(!slider->dragging) {
   1.160 +		return;
   1.161 +	}
   1.162 +
   1.163 +	BBox box = get_box();
   1.164 +
   1.165 +	float padding = get_padding();
   1.166 +	float start = box.bmin.x + padding;
   1.167 +	float end = box.bmax.x - padding;
   1.168 +	float new_val = (ev.pos.x - start) / (end - start);
   1.169 +
   1.170 +	// if we have a non-zero step, snap to the nearest value
   1.171 +	if(slider->step > 0.0) {
   1.172 +		float range = slider->range_max - slider->range_min;
   1.173 +		float st = slider->step / range;
   1.174 +
   1.175 +		new_val = ROUND(new_val / st) * st;
   1.176 +	}
   1.177 +
   1.178 +	if(new_val < 0.0) new_val = 0.0;
   1.179 +	if(new_val > 1.0) new_val = 1.0;
   1.180 +
   1.181 +	if(new_val != slider->value) {
   1.182 +		slider->value = new_val;
   1.183 +		if(slider->cont_change) {
   1.184 +			Event cev;
   1.185 +			cev.type = EV_CHANGE;
   1.186 +			handle_event(cev);
   1.187 +		}
   1.188 +	}
   1.189 +}
   1.190 +
   1.191 +static float remap(float val, float inlow, float inhigh, float outlow, float outhigh)
   1.192 +{
   1.193 +	float t = (val - inlow) / (inhigh - inlow);
   1.194 +	if(t < 0.0) t = 0.0;
   1.195 +	if(t > 1.0) t = 1.0;
   1.196 +	return t * (outhigh - outlow) + outlow;
   1.197 +}
   1.198 +
   1.199 +}	// namespace goatkit