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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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/>.
*
*/
/*
* This code is based on the CRAB engine
*
* Copyright (c) Arvind Raja Yadav
*
* Licensed under MIT
*
*/
#include "graphics/screen.h"
#include "crab/crab.h"
#include "crab/input/cursor.h"
#include "crab/ui/slider.h"
namespace Crab {
using namespace pyrodactyl::ui;
using namespace pyrodactyl::image;
using namespace pyrodactyl::input;
void Slider::load(rapidxml::xml_node<char> *node, const int &min, const int &max, const int &val) {
if (nodeValid(node)) {
_knob.load(node->first_node("knob"), false);
_bar.load(node->first_node("bar"));
_knob.x = _bar.x + ((_bar.w - _knob.w) * _value / (_max - _min));
_knob.y = _bar.y;
_knob.w = g_engine->_imageManager->getTexture(_knob._img._normal).w();
_knob.h = g_engine->_imageManager->getTexture(_knob._img._normal).h();
_knob._canmove = true;
_min = min;
_max = max;
_value = val;
_caption.load(node->first_node("caption"), &_bar);
}
}
bool Slider::handleEvents(const Common::Event &Event) {
if (_isGreyed) // do not entertain events when greyed is set
return false;
// A person is moving the knob
if (_knob.handleEvents(Event) == BUAC_GRABBED) {
int dx = g_engine->_mouse->_motion.x - _bar.x;
if (dx < 0)
dx = 0;
else if (dx > (_bar.w - _knob.w))
dx = (_bar.w - _knob.w);
_knob.x = _bar.x + dx;
_knob.y = _bar.y;
_value = _min + (((_max - _min) * (_knob.x - _bar.x)) / (_bar.w - _knob.w));
return true;
}
// If a person clicks on the slider bar, the knob needs to travel there
if ((Event.type == Common::EVENT_LBUTTONDOWN || Event.type == Common::EVENT_RBUTTONDOWN) && _bar.contains(g_engine->_mouse->_button.x, g_engine->_mouse->_button.y)) {
_knob.x = g_engine->_mouse->_button.x;
_knob.y = _bar.y;
_value = _min + (((_max - _min) * (_knob.x - _bar.x)) / (_bar.w - _knob.w));
return true;
}
return false;
}
void Slider::draw() {
_bar.draw();
_caption.draw(false);
_knob.draw();
greyOut();
}
// This function only works when slider is drawn over the textured background in Unrest
// Constants have been found by hit and trial
void Slider::greyOut() {
if (!_isGreyed)
return;
int w = _bar.w + _bar.x - _caption.x;
int h = _knob.h > _caption.h ? _knob.h : _caption.h;
byte a, r, g, b;
for (int y = _caption.y; y < _caption.y + h; y++) {
uint32 *ptr = (uint32 *)g_engine->_screen->getBasePtr(_caption.x, y);
for (int x = 0; x < w; x++, ptr++) {
g_engine->_format->colorToARGB(*ptr, a, r, g, b);
if (x >= _knob.x - _caption.x && x <= _knob.w + _knob.x - _caption.x) {
r /= 3;
g /= 3;
b /= 2;
*ptr = g_engine->_format->ARGBToColor(a, r, g, b);
} else if (g > 0x37) {
r >>= 1;
g >>= 1;
b >>= 1;
*ptr = g_engine->_format->ARGBToColor(a, r, g, b);
}
}
}
}
void Slider::value(const int val) {
_value = val;
if (_value < _min)
_value = _min;
else if (_value > _max)
_value = _max;
_knob.x = _bar.x + ((_bar.w - _knob.w) * (_value - _min)) / (_max - _min);
}
void Slider::setUI() {
_bar.setUI();
_knob.setUI();
_caption.setUI(&_bar);
_knob.x = _bar.x + ((_bar.w - _knob.w) * _value / (_max - _min));
_knob.y = _bar.y;
_knob.w = g_engine->_imageManager->getTexture(_knob._img._normal).w();
_knob.h = g_engine->_imageManager->getTexture(_knob._img._normal).h();
}
} // End of namespace Crab
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