From 845228ac6ac549ec9af97ee0da3aaa71168f605e Mon Sep 17 00:00:00 2001
From: Konstantinos Sideris <sideris.konstantin@gmail.com>
Date: Fri, 27 Oct 2017 22:20:33 +0300
Subject: Add scroll-down button

---
 src/ui/FloatingButton.cc | 95 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 src/ui/FloatingButton.cc

(limited to 'src/ui')

diff --git a/src/ui/FloatingButton.cc b/src/ui/FloatingButton.cc
new file mode 100644
index 00000000..74dcd482
--- /dev/null
+++ b/src/ui/FloatingButton.cc
@@ -0,0 +1,95 @@
+#include <QPainterPath>
+
+#include "FloatingButton.h"
+
+FloatingButton::FloatingButton(const QIcon &icon, QWidget *parent)
+  : RaisedButton(parent)
+{
+        setFixedSize(DIAMETER, DIAMETER);
+        setGeometry(buttonGeometry());
+
+        if (parentWidget())
+                parentWidget()->installEventFilter(this);
+
+        setFixedRippleRadius(50);
+        setIcon(icon);
+        raise();
+}
+
+QRect
+FloatingButton::buttonGeometry() const
+{
+        QWidget *parent = parentWidget();
+
+        if (!parent)
+                return QRect();
+
+        return QRect(parent->width() - (OFFSET_X + DIAMETER),
+                     parent->height() - (OFFSET_Y + DIAMETER),
+                     DIAMETER,
+                     DIAMETER);
+}
+
+bool
+FloatingButton::event(QEvent *event)
+{
+        if (!parent())
+                return RaisedButton::event(event);
+
+        switch (event->type()) {
+        case QEvent::ParentChange: {
+                parent()->installEventFilter(this);
+                setGeometry(buttonGeometry());
+                break;
+        }
+        case QEvent::ParentAboutToChange: {
+                parent()->installEventFilter(this);
+                break;
+        }
+        default:
+                break;
+        }
+
+        return RaisedButton::event(event);
+}
+
+bool
+FloatingButton::eventFilter(QObject *obj, QEvent *event)
+{
+        const QEvent::Type type = event->type();
+
+        if (QEvent::Move == type || QEvent::Resize == type)
+                setGeometry(buttonGeometry());
+
+        return RaisedButton::eventFilter(obj, event);
+}
+
+void
+FloatingButton::paintEvent(QPaintEvent *event)
+{
+        Q_UNUSED(event);
+
+        QRect square = QRect(0, 0, DIAMETER, DIAMETER);
+        square.moveCenter(rect().center());
+
+        QPainter p(this);
+        p.setRenderHints(QPainter::Antialiasing);
+
+        QBrush brush;
+        brush.setStyle(Qt::SolidPattern);
+        brush.setColor(backgroundColor());
+
+        p.setBrush(brush);
+        p.setPen(Qt::NoPen);
+        p.drawEllipse(square);
+
+        QRect iconGeometry(0, 0, ICON_SIZE, ICON_SIZE);
+        iconGeometry.moveCenter(square.center());
+
+        QPixmap pixmap = icon().pixmap(QSize(ICON_SIZE, ICON_SIZE));
+        QPainter icon(&pixmap);
+        icon.setCompositionMode(QPainter::CompositionMode_SourceIn);
+        icon.fillRect(pixmap.rect(), foregroundColor());
+
+        p.drawPixmap(iconGeometry, pixmap);
+}
-- 
cgit 1.5.1