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/* Battle Tanks Game
* Copyright (C) 2006-2009 Battle Tanks team
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* Additional rights can be granted beyond the GNU General Public License
* on the terms provided in the Exception. If you modify this file,
* you may extend this exception to your version of the file,
* but you are not obligated to do so. If you do not wish to provide this
* exception without modification, you must delete this exception statement
* from your version and license this file solely under the GPL without exception.
*/
#include "slider.h"
#include "sdlx/surface.h"
#include "resource_manager.h"
#include "window.h"
#include "sdlx/sdlx.h"
#include "math/unary.h"
Slider::Slider(const float value) : _n(10), _value(value), _grab(false) {
if (value > 1.0f)
throw_ex(("slider accepts only values between 0 and 1 (inclusive)"));
_tiles = ResourceManager->load_surface("menu/slider.png");
mm_slot.assign(this, &Slider::onMouseMotion, Window->mouse_motion_signal);
}
void Slider::render(sdlx::Surface &surface, const int x, const int y) const {
int w = _tiles->get_width() / 2, h = _tiles->get_height();
sdlx::Rect bound(0, 0, w, h), pointer(w, 0, w, h);
for(int i = 0; i < _n; ++i)
surface.blit(*_tiles, bound, w / 2 + x + i * w, y);
int xp = x + (int)(_value * _n * w);
surface.blit(*_tiles, pointer, xp, y);
}
void Slider::get_size(int &w, int &h) const {
w = (_tiles->get_width() / 2) * (_n + 1);
h = _tiles->get_height();
}
bool Slider::onMouse(const int button, const bool pressed, const int x, const int y) {
if (!pressed && _grab) {
_grab = false;
return true;
}
if (pressed && !_grab) {
int w = _tiles->get_width() / 2;
int xp = (int)(_value * _n * w + w/2);
if (math::abs(x - xp) < w / 2) {
_grab = true;
_grab_state = SDL_GetMouseState(NULL, NULL);
} else {
int dir = math::sign(x - xp);
_value += dir / (float)_n;
validate();
invalidate();
}
}
return false;
}
bool Slider::onMouseMotion(const int state, const int x, const int y, const int xrel, const int yrel) {
if (!_grab)
return false;
if (state != _grab_state) {
_grab = false;
return true;
}
int w = _tiles->get_width() / 2;
_value += 1.0f * xrel / w / _n;
validate();
invalidate();
//LOG_DEBUG(("tracking mouse: %d %d %d %d", x, y, xrel, yrel));
return true;
}
void Slider::set(const float value) {
_value = value;
validate();
invalidate();
}
void Slider::validate() {
if (_value < 0)
_value = 0;
else if (_value > 1)
_value = 1;
}
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