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/*
* This file is part of OpenTTD.
* OpenTTD 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 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file slider.cpp Implementation of the horizontal slider widget. */
#include "../stdafx.h"
#include "../window_gui.h"
#include "../window_func.h"
#include "../strings_func.h"
#include "../zoom_func.h"
#include "slider_func.h"
#include "../safeguards.h"
static const int SLIDER_WIDTH = 3;
/**
* Draw a volume slider widget with know at given value
* @param r Rectangle to draw the widget in
* @param value Value to put the slider at
*/
void DrawVolumeSliderWidget(Rect r, byte value)
{
/* Draw a wedge indicating low to high volume level. */
const int ha = (r.bottom - r.top) / 5;
int wx1 = r.left, wx2 = r.right;
if (_current_text_dir == TD_RTL) std::swap(wx1, wx2);
const uint shadow = _colour_gradient[COLOUR_GREY][3];
const uint fill = _colour_gradient[COLOUR_GREY][6];
const uint light = _colour_gradient[COLOUR_GREY][7];
const std::vector<Point> wedge{ Point{wx1, r.bottom - ha}, Point{wx2, r.top + ha}, Point{wx2, r.bottom - ha} };
GfxFillPolygon(wedge, fill);
GfxDrawLine(wedge[0].x, wedge[0].y, wedge[2].x, wedge[2].y, light);
GfxDrawLine(wedge[1].x, wedge[1].y, wedge[2].x, wedge[2].y, _current_text_dir == TD_RTL ? shadow : light);
GfxDrawLine(wedge[0].x, wedge[0].y, wedge[1].x, wedge[1].y, shadow);
/* Draw a slider handle indicating current volume level. */
const int sw = ScaleGUITrad(SLIDER_WIDTH);
if (_current_text_dir == TD_RTL) value = 127 - value;
const int x = r.left + (value * (r.right - r.left - sw) / 127);
DrawFrameRect(x, r.top, x + sw, r.bottom, COLOUR_GREY, FR_NONE);
}
/**
* Handle click on a volume slider widget to change the value
* @param r Rectangle of the widget
* @param pt Clicked point
* @param value[in,out] Volume value to modify
* @return True if the volume setting was modified
*/
bool ClickVolumeSliderWidget(Rect r, Point pt, byte &value)
{
const int sw = ScaleGUITrad(SLIDER_WIDTH);
byte new_vol = Clamp((pt.x - r.left - sw / 2) * 127 / (r.right - r.left - sw), 0, 127);
if (_current_text_dir == TD_RTL) new_vol = 127 - new_vol;
if (new_vol != value) {
value = new_vol;
return true;
}
return false;
}
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