153 lines
4.1 KiB
C++
153 lines
4.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* This code is based on the CRAB engine
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*
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* Copyright (c) Arvind Raja Yadav
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*
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* Licensed under MIT
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*
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*/
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#include "graphics/screen.h"
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#include "crab/crab.h"
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#include "crab/input/cursor.h"
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#include "crab/ui/slider.h"
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namespace Crab {
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using namespace pyrodactyl::ui;
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using namespace pyrodactyl::image;
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using namespace pyrodactyl::input;
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void Slider::load(rapidxml::xml_node<char> *node, const int &min, const int &max, const int &val) {
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if (nodeValid(node)) {
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_knob.load(node->first_node("knob"), false);
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_bar.load(node->first_node("bar"));
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_knob.x = _bar.x + ((_bar.w - _knob.w) * _value / (_max - _min));
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_knob.y = _bar.y;
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_knob.w = g_engine->_imageManager->getTexture(_knob._img._normal).w();
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_knob.h = g_engine->_imageManager->getTexture(_knob._img._normal).h();
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_knob._canmove = true;
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_min = min;
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_max = max;
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_value = val;
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_caption.load(node->first_node("caption"), &_bar);
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}
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}
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bool Slider::handleEvents(const Common::Event &Event) {
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if (_isGreyed) // do not entertain events when greyed is set
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return false;
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// A person is moving the knob
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if (_knob.handleEvents(Event) == BUAC_GRABBED) {
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int dx = g_engine->_mouse->_motion.x - _bar.x;
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if (dx < 0)
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dx = 0;
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else if (dx > (_bar.w - _knob.w))
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dx = (_bar.w - _knob.w);
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_knob.x = _bar.x + dx;
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_knob.y = _bar.y;
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_value = _min + (((_max - _min) * (_knob.x - _bar.x)) / (_bar.w - _knob.w));
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return true;
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}
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// If a person clicks on the slider bar, the knob needs to travel there
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if ((Event.type == Common::EVENT_LBUTTONDOWN || Event.type == Common::EVENT_RBUTTONDOWN) && _bar.contains(g_engine->_mouse->_button.x, g_engine->_mouse->_button.y)) {
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_knob.x = g_engine->_mouse->_button.x;
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_knob.y = _bar.y;
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_value = _min + (((_max - _min) * (_knob.x - _bar.x)) / (_bar.w - _knob.w));
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return true;
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}
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return false;
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}
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void Slider::draw() {
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_bar.draw();
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_caption.draw(false);
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_knob.draw();
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greyOut();
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}
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// This function only works when slider is drawn over the textured background in Unrest
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// Constants have been found by hit and trial
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void Slider::greyOut() {
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if (!_isGreyed)
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return;
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int w = _bar.w + _bar.x - _caption.x;
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int h = _knob.h > _caption.h ? _knob.h : _caption.h;
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byte a, r, g, b;
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for (int y = _caption.y; y < _caption.y + h; y++) {
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uint32 *ptr = (uint32 *)g_engine->_screen->getBasePtr(_caption.x, y);
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for (int x = 0; x < w; x++, ptr++) {
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g_engine->_format.colorToARGB(*ptr, a, r, g, b);
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if (x >= _knob.x - _caption.x && x <= _knob.w + _knob.x - _caption.x) {
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r /= 3;
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g /= 3;
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b /= 2;
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*ptr = g_engine->_format.ARGBToColor(a, r, g, b);
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} else if (g > 0x37) {
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r >>= 1;
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g >>= 1;
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b >>= 1;
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*ptr = g_engine->_format.ARGBToColor(a, r, g, b);
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}
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}
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}
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}
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void Slider::value(const int val) {
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_value = val;
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if (_value < _min)
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_value = _min;
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else if (_value > _max)
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_value = _max;
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_knob.x = _bar.x + ((_bar.w - _knob.w) * (_value - _min)) / (_max - _min);
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}
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void Slider::setUI() {
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_bar.setUI();
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_knob.setUI();
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_caption.setUI(&_bar);
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_knob.x = _bar.x + ((_bar.w - _knob.w) * _value / (_max - _min));
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_knob.y = _bar.y;
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_knob.w = g_engine->_imageManager->getTexture(_knob._img._normal).w();
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_knob.h = g_engine->_imageManager->getTexture(_knob._img._normal).h();
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}
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} // End of namespace Crab
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