nuclear@6: /*
nuclear@6: GoatKit - a themable/animated widget toolkit for games
nuclear@6: Copyright (C) 2014  John Tsiombikas <nuclear@member.fsf.org>
nuclear@6: 
nuclear@6: This program is free software: you can redistribute it and/or modify
nuclear@6: it under the terms of the GNU Lesser General Public License as published by
nuclear@6: the Free Software Foundation, either version 3 of the License, or
nuclear@6: (at your option) any later version.
nuclear@6: 
nuclear@6: This program is distributed in the hope that it will be useful,
nuclear@6: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@6: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@6: GNU Lesser General Public License for more details.
nuclear@6: 
nuclear@6: You should have received a copy of the GNU Lesser General Public License
nuclear@6: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@6: */
nuclear@6: #include <stdio.h>
nuclear@6: #include <math.h>
nuclear@6: #include "slider.h"
nuclear@6: #include "screen.h"
nuclear@6: 
nuclear@6: namespace goatkit {
nuclear@6: 
nuclear@6: struct SliderImpl {
nuclear@6: 	float value, prev_value;
nuclear@6: 	float range_min, range_max;
nuclear@6: 	float padding;
nuclear@6: 	float step;
nuclear@6: 	bool dragging;
nuclear@6: 	bool cont_change;
nuclear@6: };
nuclear@6: 
nuclear@6: static float remap(float val, float inlow, float inhigh, float outlow, float outhigh);
nuclear@6: 
nuclear@6: Slider::Slider()
nuclear@6: {
nuclear@6: 	slider = new SliderImpl;
nuclear@6: 	slider->value = slider->prev_value = 0.0f;
nuclear@6: 	slider->dragging = false;
nuclear@6: 	slider->cont_change = true;
nuclear@6: 
nuclear@6: 	slider->range_min = 0.0;
nuclear@6: 	slider->range_max = 1.0;
nuclear@6: 	slider->step = 0.0;
nuclear@6: 
nuclear@6: 	slider->padding = -1.0;
nuclear@6: }
nuclear@6: 
nuclear@6: Slider::~Slider()
nuclear@6: {
nuclear@6: 	delete slider;
nuclear@6: }
nuclear@6: 
nuclear@6: const char *Slider::get_type_name() const
nuclear@6: {
nuclear@6: 	return "slider";
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::set_value(float val)
nuclear@6: {
nuclear@6: 	slider->value = remap(val, slider->range_min, slider->range_max, 0, 1);
nuclear@6: }
nuclear@6: 
nuclear@6: float Slider::get_value() const
nuclear@6: {
nuclear@6: 	return remap(slider->value, 0, 1, slider->range_min, slider->range_max);
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::set_value_norm(float val)
nuclear@6: {
nuclear@6: 	slider->value = val < 0.0 ? 0.0 : (val > 1.0 ? 1.0 : val);
nuclear@6: }
nuclear@6: 
nuclear@6: float Slider::get_value_norm() const
nuclear@6: {
nuclear@6: 	return slider->value;
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::set_padding(float pad)
nuclear@6: {
nuclear@6: 	slider->padding = pad;
nuclear@6: }
nuclear@6: 
nuclear@6: float Slider::get_padding() const
nuclear@6: {
nuclear@6: 	if(slider->padding < 0.0) {
nuclear@6: 		BBox box = get_box();
nuclear@6: 		return (box.bmax.y - box.bmin.y) * 0.25;
nuclear@6: 	}
nuclear@6: 	return slider->padding;
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::set_continuous_change(bool cont)
nuclear@6: {
nuclear@6: 	slider->cont_change = cont;
nuclear@6: }
nuclear@6: 
nuclear@6: bool Slider::get_continuous_change() const
nuclear@6: {
nuclear@6: 	return slider->cont_change;
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::set_range(float min, float max)
nuclear@6: {
nuclear@6: 	slider->range_min = min;
nuclear@6: 	slider->range_max = max;
nuclear@6: }
nuclear@6: 
nuclear@6: float Slider::get_range_min() const
nuclear@6: {
nuclear@6: 	return slider->range_min;
nuclear@6: }
nuclear@6: 
nuclear@6: float Slider::get_range_max() const
nuclear@6: {
nuclear@6: 	return slider->range_max;
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::set_step(float step)
nuclear@6: {
nuclear@6: 	slider->step = step;
nuclear@6: }
nuclear@6: 
nuclear@6: float Slider::get_step() const
nuclear@6: {
nuclear@6: 	return slider->step;
nuclear@6: }
nuclear@6: 
nuclear@6: void Slider::on_mouse_button(const ButtonEvent &ev)
nuclear@6: {
nuclear@6: 	if(ev.button == 0) {
nuclear@6: 		Screen *scr = get_screen();
nuclear@6: 
nuclear@6: 		slider->dragging = ev.press;
nuclear@6: 		if(ev.press) {
nuclear@6: 			if(scr) scr->grab_mouse(this);
nuclear@6: 		} else {
nuclear@6: 			if(scr) scr->grab_mouse(0);
nuclear@6: 
nuclear@6: 			// on release, if the value has changed send the appropriate event
nuclear@6: 			if(slider->prev_value != slider->value) {
nuclear@6: 				Event ev;
nuclear@6: 				ev.type = EV_CHANGE;
nuclear@6: 				handle_event(ev);
nuclear@6: 				slider->prev_value = slider->value;
nuclear@6: 			}
nuclear@6: 		}
nuclear@6: 	}
nuclear@6: }
nuclear@6: 
nuclear@6: #define ROUND(x)	floor((x) + 0.5)
nuclear@6: 
nuclear@6: void Slider::on_mouse_motion(const MotionEvent &ev)
nuclear@6: {
nuclear@6: 	if(!slider->dragging) {
nuclear@6: 		return;
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	BBox box = get_box();
nuclear@6: 
nuclear@6: 	float padding = get_padding();
nuclear@6: 	float start = box.bmin.x + padding;
nuclear@6: 	float end = box.bmax.x - padding;
nuclear@6: 	float new_val = (ev.pos.x - start) / (end - start);
nuclear@6: 
nuclear@6: 	// if we have a non-zero step, snap to the nearest value
nuclear@6: 	if(slider->step > 0.0) {
nuclear@6: 		float range = slider->range_max - slider->range_min;
nuclear@6: 		float st = slider->step / range;
nuclear@6: 
nuclear@6: 		new_val = ROUND(new_val / st) * st;
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	if(new_val < 0.0) new_val = 0.0;
nuclear@6: 	if(new_val > 1.0) new_val = 1.0;
nuclear@6: 
nuclear@6: 	if(new_val != slider->value) {
nuclear@6: 		slider->value = new_val;
nuclear@6: 		if(slider->cont_change) {
nuclear@6: 			Event cev;
nuclear@6: 			cev.type = EV_CHANGE;
nuclear@6: 			handle_event(cev);
nuclear@6: 		}
nuclear@6: 	}
nuclear@6: }
nuclear@6: 
nuclear@6: static float remap(float val, float inlow, float inhigh, float outlow, float outhigh)
nuclear@6: {
nuclear@6: 	float t = (val - inlow) / (inhigh - inlow);
nuclear@6: 	if(t < 0.0) t = 0.0;
nuclear@6: 	if(t > 1.0) t = 1.0;
nuclear@6: 	return t * (outhigh - outlow) + outlow;
nuclear@6: }
nuclear@6: 
nuclear@6: }	// namespace goatkit