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/*
* nheko Copyright (C) 2017 Konstantinos Sideris <siderisk@auth.gr>
*
* 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/>.
*/
#include <QDebug>
#include <QGraphicsOpacityEffect>
#include <QPropertyAnimation>
#include "ScrollBar.h"
ScrollBar::ScrollBar(QScrollArea *area, QWidget *parent)
: QScrollBar(parent)
, area_{area}
{
hideTimer_.setSingleShot(true);
connect(&hideTimer_, &QTimer::timeout, this, &ScrollBar::fadeOut);
eff = new QGraphicsOpacityEffect(this);
setGraphicsEffect(eff);
}
void ScrollBar::fadeOut()
{
isActive = false;
QPropertyAnimation *anim = new QPropertyAnimation(eff, "opacity");
anim->setDuration(AnimationDuration);
anim->setStartValue(1);
anim->setEndValue(0);
anim->setEasingCurve(QEasingCurve::Linear);
anim->start(QPropertyAnimation::DeleteWhenStopped);
}
void ScrollBar::fadeIn()
{
QPropertyAnimation *anim = new QPropertyAnimation(eff, "opacity");
anim->setDuration(AnimationDuration);
anim->setStartValue(0);
anim->setEndValue(1);
anim->setEasingCurve(QEasingCurve::Linear);
anim->start(QPropertyAnimation::DeleteWhenStopped);
}
void ScrollBar::sliderChange(SliderChange change)
{
if (!isActive)
fadeIn();
hideTimer_.stop();
hideTimer_.start(1500);
isActive = true;
QScrollBar::sliderChange(change);
}
void ScrollBar::paintEvent(QPaintEvent *)
{
if (!width() && !height()) {
hide();
return;
}
QPainter p(this);
p.setRenderHint(QPainter::TextAntialiasing);
p.setRenderHint(QPainter::Antialiasing);
p.setRenderHint(QPainter::SmoothPixmapTransform);
p.setPen(Qt::NoPen);
QColor bg(33, 33, 33, 30);
QColor handle(0, 0, 0, 80);
p.setBrush(bg);
QRect backgroundArea(Padding, 0, handleWidth_, height());
p.drawRoundedRect(backgroundArea, roundRadius_, roundRadius_);
int areaHeight = area_->height();
int widgetHeight = area_->widget()->height();
double visiblePercentage = (double)areaHeight / (double)widgetHeight;
int handleHeight = std::max(visiblePercentage * areaHeight, (double)minHandleHeight_);
if (maximum() == 0) {
return;
}
int handle_y = (value() * (areaHeight - handleHeight - roundRadius_ / 2)) / maximum();
p.setBrush(handle);
QRect handleArea(Padding, handle_y, handleWidth_, handleHeight);
p.drawRoundedRect(handleArea, roundRadius_, roundRadius_);
}
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