Initial commit

engines/crab/ui/slider.cpp

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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