sdrangel/sdrgui/gui/tickedslider.cpp

82 wiersze
3.2 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017 Edouard Griffiths, F4EXB. //
// //
// Swagger server adapter interface //
// //
// 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 as 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 V3 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <QStylePainter>
#include <QStyleOptionSlider>
#include <math.h>
#include "tickedslider.h"
TickedSlider::TickedSlider(QWidget* parent) :
QSlider(parent),
m_tickColor(Qt::white)
{ }
void TickedSlider::paintEvent(QPaintEvent *ev)
{
(void) ev;
QStylePainter p(this);
QStyleOptionSlider opt;
initStyleOption(&opt);
QRect handle = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
// draw tick marks
// do this manually because they are very badly behaved with style sheets
int interval = tickInterval();
if (interval == 0)
{
interval = pageStep();
}
if (tickPosition() != NoTicks)
{
for (int i = minimum(); i <= maximum(); i += interval)
{
int x = roundf((double)((double)((double)(i - this->minimum()) / (double)(this->maximum() - this->minimum())) * (double)(this->width() - handle.width()) + (double)(handle.width() / 2.0))) - 1;
int h = 4;
p.setPen(m_tickColor);
if (tickPosition() == TicksBothSides || tickPosition() == TicksAbove)
{
int y = this->rect().top();
p.drawLine(x, y, x, y + h);
}
if (tickPosition() == TicksBothSides || tickPosition() == TicksBelow)
{
int y = this->rect().bottom();
p.drawLine(x, y, x, y - h);
}
}
}
// draw the slider (this is basically copy/pasted from QSlider::paintEvent)
opt.subControls = QStyle::SC_SliderGroove;
p.drawComplexControl(QStyle::CC_Slider, opt);
// draw the slider handle
opt.subControls = QStyle::SC_SliderHandle;
p.drawComplexControl(QStyle::CC_Slider, opt);
}