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annotate libs/goatkit/slider.cc @ 20:2b85d05df3f2

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animation controls for easier screenshot grabbing
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 02 Oct 2015 04:54:55 +0300
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nuclear@6 1 /*
nuclear@6 2 GoatKit - a themable/animated widget toolkit for games
nuclear@6 3 Copyright (C) 2014 John Tsiombikas <nuclear@member.fsf.org>
nuclear@6 4
nuclear@6 5 This program is free software: you can redistribute it and/or modify
nuclear@6 6 it under the terms of the GNU Lesser General Public License as published by
nuclear@6 7 the Free Software Foundation, either version 3 of the License, or
nuclear@6 8 (at your option) any later version.
nuclear@6 9
nuclear@6 10 This program is distributed in the hope that it will be useful,
nuclear@6 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@6 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@6 13 GNU Lesser General Public License for more details.
nuclear@6 14
nuclear@6 15 You should have received a copy of the GNU Lesser General Public License
nuclear@6 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@6 17 */
nuclear@6 18 #include <stdio.h>
nuclear@6 19 #include <math.h>
nuclear@6 20 #include "slider.h"
nuclear@6 21 #include "screen.h"
nuclear@6 22
nuclear@6 23 namespace goatkit {
nuclear@6 24
nuclear@6 25 struct SliderImpl {
nuclear@6 26 float value, prev_value;
nuclear@6 27 float range_min, range_max;
nuclear@6 28 float padding;
nuclear@6 29 float step;
nuclear@6 30 bool dragging;
nuclear@6 31 bool cont_change;
nuclear@6 32 };
nuclear@6 33
nuclear@6 34 static float remap(float val, float inlow, float inhigh, float outlow, float outhigh);
nuclear@6 35
nuclear@6 36 Slider::Slider()
nuclear@6 37 {
nuclear@6 38 slider = new SliderImpl;
nuclear@6 39 slider->value = slider->prev_value = 0.0f;
nuclear@6 40 slider->dragging = false;
nuclear@6 41 slider->cont_change = true;
nuclear@6 42
nuclear@6 43 slider->range_min = 0.0;
nuclear@6 44 slider->range_max = 1.0;
nuclear@6 45 slider->step = 0.0;
nuclear@6 46
nuclear@6 47 slider->padding = -1.0;
nuclear@6 48 }
nuclear@6 49
nuclear@6 50 Slider::~Slider()
nuclear@6 51 {
nuclear@6 52 delete slider;
nuclear@6 53 }
nuclear@6 54
nuclear@6 55 const char *Slider::get_type_name() const
nuclear@6 56 {
nuclear@6 57 return "slider";
nuclear@6 58 }
nuclear@6 59
nuclear@6 60 void Slider::set_value(float val)
nuclear@6 61 {
nuclear@6 62 slider->value = remap(val, slider->range_min, slider->range_max, 0, 1);
nuclear@6 63 }
nuclear@6 64
nuclear@6 65 float Slider::get_value() const
nuclear@6 66 {
nuclear@6 67 return remap(slider->value, 0, 1, slider->range_min, slider->range_max);
nuclear@6 68 }
nuclear@6 69
nuclear@6 70 void Slider::set_value_norm(float val)
nuclear@6 71 {
nuclear@6 72 slider->value = val < 0.0 ? 0.0 : (val > 1.0 ? 1.0 : val);
nuclear@6 73 }
nuclear@6 74
nuclear@6 75 float Slider::get_value_norm() const
nuclear@6 76 {
nuclear@6 77 return slider->value;
nuclear@6 78 }
nuclear@6 79
nuclear@6 80 void Slider::set_padding(float pad)
nuclear@6 81 {
nuclear@6 82 slider->padding = pad;
nuclear@6 83 }
nuclear@6 84
nuclear@6 85 float Slider::get_padding() const
nuclear@6 86 {
nuclear@6 87 if(slider->padding < 0.0) {
nuclear@6 88 BBox box = get_box();
nuclear@6 89 return (box.bmax.y - box.bmin.y) * 0.25;
nuclear@6 90 }
nuclear@6 91 return slider->padding;
nuclear@6 92 }
nuclear@6 93
nuclear@6 94 void Slider::set_continuous_change(bool cont)
nuclear@6 95 {
nuclear@6 96 slider->cont_change = cont;
nuclear@6 97 }
nuclear@6 98
nuclear@6 99 bool Slider::get_continuous_change() const
nuclear@6 100 {
nuclear@6 101 return slider->cont_change;
nuclear@6 102 }
nuclear@6 103
nuclear@6 104 void Slider::set_range(float min, float max)
nuclear@6 105 {
nuclear@6 106 slider->range_min = min;
nuclear@6 107 slider->range_max = max;
nuclear@6 108 }
nuclear@6 109
nuclear@6 110 float Slider::get_range_min() const
nuclear@6 111 {
nuclear@6 112 return slider->range_min;
nuclear@6 113 }
nuclear@6 114
nuclear@6 115 float Slider::get_range_max() const
nuclear@6 116 {
nuclear@6 117 return slider->range_max;
nuclear@6 118 }
nuclear@6 119
nuclear@6 120 void Slider::set_step(float step)
nuclear@6 121 {
nuclear@6 122 slider->step = step;
nuclear@6 123 }
nuclear@6 124
nuclear@6 125 float Slider::get_step() const
nuclear@6 126 {
nuclear@6 127 return slider->step;
nuclear@6 128 }
nuclear@6 129
nuclear@6 130 void Slider::on_mouse_button(const ButtonEvent &ev)
nuclear@6 131 {
nuclear@6 132 if(ev.button == 0) {
nuclear@6 133 Screen *scr = get_screen();
nuclear@6 134
nuclear@6 135 slider->dragging = ev.press;
nuclear@6 136 if(ev.press) {
nuclear@6 137 if(scr) scr->grab_mouse(this);
nuclear@6 138 } else {
nuclear@6 139 if(scr) scr->grab_mouse(0);
nuclear@6 140
nuclear@6 141 // on release, if the value has changed send the appropriate event
nuclear@6 142 if(slider->prev_value != slider->value) {
nuclear@6 143 Event ev;
nuclear@6 144 ev.type = EV_CHANGE;
nuclear@6 145 handle_event(ev);
nuclear@6 146 slider->prev_value = slider->value;
nuclear@6 147 }
nuclear@6 148 }
nuclear@6 149 }
nuclear@6 150 }
nuclear@6 151
nuclear@6 152 #define ROUND(x) floor((x) + 0.5)
nuclear@6 153
nuclear@6 154 void Slider::on_mouse_motion(const MotionEvent &ev)
nuclear@6 155 {
nuclear@6 156 if(!slider->dragging) {
nuclear@6 157 return;
nuclear@6 158 }
nuclear@6 159
nuclear@6 160 BBox box = get_box();
nuclear@6 161
nuclear@6 162 float padding = get_padding();
nuclear@6 163 float start = box.bmin.x + padding;
nuclear@6 164 float end = box.bmax.x - padding;
nuclear@6 165 float new_val = (ev.pos.x - start) / (end - start);
nuclear@6 166
nuclear@6 167 // if we have a non-zero step, snap to the nearest value
nuclear@6 168 if(slider->step > 0.0) {
nuclear@6 169 float range = slider->range_max - slider->range_min;
nuclear@6 170 float st = slider->step / range;
nuclear@6 171
nuclear@6 172 new_val = ROUND(new_val / st) * st;
nuclear@6 173 }
nuclear@6 174
nuclear@6 175 if(new_val < 0.0) new_val = 0.0;
nuclear@6 176 if(new_val > 1.0) new_val = 1.0;
nuclear@6 177
nuclear@6 178 if(new_val != slider->value) {
nuclear@6 179 slider->value = new_val;
nuclear@6 180 if(slider->cont_change) {
nuclear@6 181 Event cev;
nuclear@6 182 cev.type = EV_CHANGE;
nuclear@6 183 handle_event(cev);
nuclear@6 184 }
nuclear@6 185 }
nuclear@6 186 }
nuclear@6 187
nuclear@6 188 static float remap(float val, float inlow, float inhigh, float outlow, float outhigh)
nuclear@6 189 {
nuclear@6 190 float t = (val - inlow) / (inhigh - inlow);
nuclear@6 191 if(t < 0.0) t = 0.0;
nuclear@6 192 if(t > 1.0) t = 1.0;
nuclear@6 193 return t * (outhigh - outlow) + outlow;
nuclear@6 194 }
nuclear@6 195
nuclear@6 196 } // namespace goatkit