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59 lines
1.9 KiB
59 lines
1.9 KiB
/*
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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 "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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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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p.setBrush(backgroundColor());
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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(handleColor());
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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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