111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
/*
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* nheko Copyright (C) 2017 Konstantinos Sideris <siderisk@auth.gr>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <QDebug>
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#include <QGraphicsOpacityEffect>
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#include <QPropertyAnimation>
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#include "ScrollBar.h"
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ScrollBar::ScrollBar(QScrollArea *area, QWidget *parent)
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: QScrollBar(parent)
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, area_{area}
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{
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hideTimer_.setSingleShot(true);
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connect(&hideTimer_, &QTimer::timeout, this, &ScrollBar::fadeOut);
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eff = new QGraphicsOpacityEffect(this);
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setGraphicsEffect(eff);
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}
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void
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ScrollBar::fadeOut()
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{
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isActive = false;
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QPropertyAnimation *anim = new QPropertyAnimation(eff, "opacity");
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anim->setDuration(AnimationDuration);
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anim->setStartValue(1);
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anim->setEndValue(0);
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anim->setEasingCurve(QEasingCurve::Linear);
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anim->start(QPropertyAnimation::DeleteWhenStopped);
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}
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void
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ScrollBar::fadeIn()
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{
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QPropertyAnimation *anim = new QPropertyAnimation(eff, "opacity");
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anim->setDuration(AnimationDuration);
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anim->setStartValue(0);
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anim->setEndValue(1);
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anim->setEasingCurve(QEasingCurve::Linear);
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anim->start(QPropertyAnimation::DeleteWhenStopped);
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}
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void
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ScrollBar::sliderChange(SliderChange change)
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{
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if (!isActive)
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fadeIn();
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hideTimer_.stop();
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hideTimer_.start(1500);
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isActive = true;
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QScrollBar::sliderChange(change);
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}
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void
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ScrollBar::paintEvent(QPaintEvent *)
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{
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if (!width() && !height()) {
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hide();
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return;
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}
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QPainter p(this);
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p.setRenderHint(QPainter::TextAntialiasing);
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p.setRenderHint(QPainter::Antialiasing);
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p.setRenderHint(QPainter::SmoothPixmapTransform);
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p.setPen(Qt::NoPen);
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QColor bg(33, 33, 33, 30);
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QColor handle(0, 0, 0, 80);
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p.setBrush(bg);
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QRect backgroundArea(Padding, 0, handleWidth_, height());
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p.drawRoundedRect(backgroundArea, roundRadius_, roundRadius_);
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int areaHeight = area_->height();
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int widgetHeight = area_->widget()->height();
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double visiblePercentage = (double)areaHeight / (double)widgetHeight;
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int handleHeight = std::max(visiblePercentage * areaHeight, (double)minHandleHeight_);
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if (maximum() == 0) {
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return;
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}
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int handle_y = (value() * (areaHeight - handleHeight - roundRadius_ / 2)) / maximum();
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p.setBrush(handle);
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QRect handleArea(Padding, handle_y, handleWidth_, handleHeight);
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p.drawRoundedRect(handleArea, roundRadius_, roundRadius_);
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}
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