soft-mood/slider.cpp

/* 
 * This file is part of Soft Mood (https://notabug.org/alkeon/soft-mood).
 * Copyright (c) 2019 Alejandro "alkeon" Castilla
 * 
 * This program is free software: you can redistribute it and/or modify  
 * it under the terms of the GNU General Public License as published by  
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "slider.h"

slider::slider(SDL_Renderer * src, int pos_x, int pos_y):
	_src(src), _value(0), _pos_x(pos_x), _pos_y(pos_y) {
	
	_button_dst.x = _pos_x - (SLIDER_WIDTH / 2);
	_button_dst.y = _pos_y - (SLIDER_HEIGHT / 2);
	_button_dst.w = SLIDER_WIDTH;
	_button_dst.h = SLIDER_HEIGHT;

	_button_bounds_dst.w = _button_dst.w;
	_button_bounds_dst.h = (_button_dst.h * 5) + 10;
	_button_bounds_dst.x = _button_dst.x;
	_button_bounds_dst.y = _button_dst.y - (_button_bounds_dst.h - _button_dst.h);

	_fillbar_dst.h = _button_bounds_dst.h - (_button_dst.y - _button_bounds_dst.y);
	_fillbar_dst.w = _button_dst.w / 4;
	_fillbar_dst.x = _button_dst.x + _button_dst.w / 2 - _fillbar_dst.w / 2;
	_fillbar_dst.y = _button_dst.y;

	draw();
}

void slider::set_image(const string& file){

	_has_image = true;
	_image_file = file;
	draw_image();

}

void slider::test_mouse_follow(SDL_Point* mouse, SDL_Point* mouse_offset){
	if(SDL_PointInRect(mouse, &_button_dst)){
		_mouse_follow = true;
		mouse_offset->y = mouse->y - _button_dst.y;
	}
}

void slider::draw_image(){
	if(_has_image){

		SDL_Rect s1;
		s1.x = _button_bounds_dst.x + 5;
		s1.y = _button_bounds_dst.y + _button_bounds_dst.h + 20;
		
		SDL_Surface * temp_surface;
		temp_surface = IMG_Load(_image_file.c_str());
		if(temp_surface != NULL){
			
			SDL_Texture * fillbar = SDL_CreateTextureFromSurface(_src, temp_surface);
			if(fillbar == NULL)
				cout << "Fillbar couldn't be created" << endl;

			SDL_QueryTexture(fillbar, NULL, NULL, &s1.w, &s1.h);
			SDL_RenderCopy(_src, fillbar, NULL, &s1);
			SDL_DestroyTexture(fillbar);

		}else if(_image_file.size() > 0)
			cout << "Icon (" << _image_file << ") couldn't be loaded" << endl;

		SDL_FreeSurface(temp_surface);
	}
}

void slider::draw(){

	SDL_Surface * s;
	SDL_Texture * texture;
	SDL_Texture * bar;
	SDL_Texture * bg;

	s = SDL_CreateRGBSurface(0, _pos_y + SLIDER_HEIGHT, _pos_x + SLIDER_WIDTH, 32, 0, 0, 0, 255);
	if(s == NULL)
		cout << "Surface couldn't be created" << endl;

	_button_dst.x = _pos_x - (SLIDER_WIDTH / 2);
	SDL_FillRect(s, NULL, SDL_MapRGBA(s->format, 0, 0, 0, 255));
	bg = SDL_CreateTextureFromSurface(_src, s);
	if(bg == NULL)
		cout << "Background couldn't be created" << endl;

	int min = _button_bounds_dst.y + _button_dst.h / 2;
	int max = (_button_bounds_dst.y + _button_bounds_dst.h) - (_button_dst.h / 2);
	int b = max - (_button_dst.y + _button_dst.h / 2);
	float step = ((float) (max - min)) / 100;
	_value = roundf(b / step);

	SDL_FillRect(s,NULL, SDL_MapRGBA(s->format, 100, 100, 100, 255));
	texture = SDL_CreateTextureFromSurface(_src, s);
	if(texture == NULL)
		cout << "Texture couldn't be created" << endl;

	SDL_FillRect(s,NULL, SDL_MapRGBA(s->format, 238, 18, 18, 255));
	bar = SDL_CreateTextureFromSurface(_src, s);
	if(bar == NULL)
		cout << "Bar couldn't be created" << endl;

	SDL_RenderCopy(_src, bg, NULL, &_button_bounds_dst);
	SDL_RenderCopy(_src, bar, NULL, &_fillbar_dst);
	SDL_RenderCopy(_src, texture, NULL, &_button_dst);

	SDL_FreeSurface(s);
	SDL_DestroyTexture(bg);
	SDL_DestroyTexture(bar);
	SDL_DestroyTexture(texture);
	draw_image();

}

void slider::update(int pos_y){
	if(_mouse_follow){
		_button_dst.y = pos_y;
		
		if (_button_dst.y <= _button_bounds_dst.y)
			_button_dst.y = _button_bounds_dst.y;
		if (_button_dst.y+_button_dst.h >= _button_bounds_dst.y + _button_bounds_dst.h)
			_button_dst.y = (_button_bounds_dst.y + _button_bounds_dst.h) - _button_dst.h;
			
		_fillbar_dst.y = _button_dst.y;
		_fillbar_dst.h = _button_bounds_dst.h - (_button_dst.y - _button_bounds_dst.y);
	
	}
}