From 251f569a5c2306b711e6b24c43c393f169132df4 Mon Sep 17 00:00:00 2001
From: Konstantinos Sideris <sideris.konstantin@gmail.com>
Date: Wed, 24 May 2017 22:45:13 +0300
Subject: Add custom scrollbar on the timeline

---
 src/ui/ScrollBar.cc | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/ui/ScrollBar.cc

(limited to 'src/ui')

diff --git a/src/ui/ScrollBar.cc b/src/ui/ScrollBar.cc
new file mode 100644
index 00000000..300b9a04
--- /dev/null
+++ b/src/ui/ScrollBar.cc
@@ -0,0 +1,106 @@
+/*
+ * 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_);
+}
-- 
cgit 1.5.1