From 3ceee7cddb27fc6b5237328684d799f27cf6623a Mon Sep 17 00:00:00 2001
From: Peter Hartmann <peter@edelhirsch.io>
Date: Wed, 30 Sep 2020 16:25:42 +0200
Subject: [PATCH] change hints for progress bars

---
 .../iot-dashboard/CircularProgressBar.cpp     | 19 ++++++++++++-------
 examples/iot-dashboard/CircularProgressBar.h  |  9 +++++++++
 examples/iot-dashboard/PieChartPainted.cpp    | 12 ++++++++++++
 3 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/examples/iot-dashboard/CircularProgressBar.cpp b/examples/iot-dashboard/CircularProgressBar.cpp
index c961b213..c9999716 100644
--- a/examples/iot-dashboard/CircularProgressBar.cpp
+++ b/examples/iot-dashboard/CircularProgressBar.cpp
@@ -7,6 +7,17 @@ CircularProgressBar::CircularProgressBar( const QGradient& gradient, int progres
     , m_gradient( gradient )
     , m_progress( progress )
 {
+    connect( this, &QQuickPaintedItem::contentsSizeChanged, [this]()
+    {
+        auto size = contentsSize();
+        QRadialGradient ringGradient( size.width() / 2, size.height() / 2, 45 );
+        QGradientStop stop1( 0.0, "#c0c0c0" );
+        QGradientStop stop2( 0.5, "#f0f0f0" );
+        QGradientStop stop3( 1.0, "#c0c0c0" );
+        ringGradient.setStops( {stop1, stop2, stop3} );
+
+        m_ringGradient = ringGradient;
+    } );
 }
 
 void CircularProgressBar::paint( QPainter* painter )
@@ -16,13 +27,7 @@ void CircularProgressBar::paint( QPainter* painter )
 
     painter->setRenderHint( QPainter::Antialiasing, true );
 
-    QRadialGradient gradient( size.width() / 2, size.height() / 2, 45 );
-    QGradientStop stop1( 0.0, "#c0c0c0" );
-    QGradientStop stop2( 0.5, "#f0f0f0" );
-    QGradientStop stop3( 1.0, "#c0c0c0" );
-    gradient.setStops( {stop1, stop2, stop3} );
-
-    painter->setBrush( gradient );
+    painter->setBrush( m_ringGradient );
     painter->setPen( m_backgroundColor );
     painter->drawEllipse( outerRect );
 
diff --git a/examples/iot-dashboard/CircularProgressBar.h b/examples/iot-dashboard/CircularProgressBar.h
index 78489492..c5ee14b0 100644
--- a/examples/iot-dashboard/CircularProgressBar.h
+++ b/examples/iot-dashboard/CircularProgressBar.h
@@ -26,11 +26,20 @@ class CircularProgressBar : public QQuickPaintedItem
             m_backgroundColor = color;
         }
 
+        QRadialGradient ringGradient() const
+        {
+            return m_ringGradient;
+        }
 
+        void setRingGradient( const QRadialGradient& gradient )
+        {
+            m_ringGradient = gradient;
+        }
 
     private:
         QGradient m_gradient;
         QColor m_backgroundColor;
+        QRadialGradient m_ringGradient;
         double m_width = 20;
         int m_progress;
 };
diff --git a/examples/iot-dashboard/PieChartPainted.cpp b/examples/iot-dashboard/PieChartPainted.cpp
index bdf863c8..744f3ef5 100644
--- a/examples/iot-dashboard/PieChartPainted.cpp
+++ b/examples/iot-dashboard/PieChartPainted.cpp
@@ -33,6 +33,18 @@ PieChartPainted::PieChartPainted( const QColor& color, const QGradient& gradient
     {
         const QColor c = this->color( Panel );
         m_progressBar->setBackgroundColor( c );
+
+        QRadialGradient gradient = m_progressBar->ringGradient();
+        QRadialGradient newGradient = gradient;
+
+        for( const QGradientStop& stop : gradient.stops() )
+        {
+            QColor s = stop.second;
+            QColor newColor = { 255 - s.red(), 255 - s.green(), 255 - s.blue()};
+            newGradient.setColorAt( stop.first, newColor );
+        }
+
+        m_progressBar->setRingGradient( newGradient );
     } );
 }