Make LenaPi usable on Android devices

- Add app icon
- prevend android device from shutting down cpu while playing music
- fix scaling bug
- fix energy saver for RasPi by reconnecting to music player
- minor refactorings and renaming

LenaPi/controllers/StyleHandling.cpp

@@ -0,0 +1,90 @@
+#include "StyleHandling.h"
+#include <QGuiApplication>
+#include <QScreen>
+#include <QDebug>
+
+StyleHandling::StyleHandling(QObject *parent)
+    : QObject{parent}, mStyleSizes(new QQmlPropertyMap(this)),
+      mMargins(new QQmlPropertyMap(this)), mSpacings(new QQmlPropertyMap(this)), mPaddings(new QQmlPropertyMap(this))
+{
+ // nothing
+}
+
+void StyleHandling::calculateAndSetRatio()
+{
+    qreal refHeight = 480;
+    qreal refWidth = 800;
+    // Scales to fullscreen. No rescaling when changing window size
+    QRect rect = QGuiApplication::primaryScreen()->geometry();
+    qreal height = qMin(rect.width(),rect.height());
+    qreal width = qMax(rect.width(), rect.height());
+
+    mRatio = qMin(height/refHeight, width/refWidth);
+    qDebug() << "mRation=" << mRatio<< "sizes="<<width<<", "<< height<<"\n";
+}
+
+void StyleHandling::initStyleSizes()
+{
+    scaleAndInsert(mStyleSizes, "roundButtonDefaultSize", 65);
+    scaleAndInsert(mStyleSizes, "roundButtonBorderWidth", 2);
+    scaleAndInsert(mStyleSizes, "smallPlayerButtonSize", 60);
+    scaleAndInsert(mStyleSizes, "largePlayerButtonSize", 80);
+
+    scaleAndInsert(mStyleSizes, "scrollHandleWidth", 16);
+    scaleAndInsert(mStyleSizes, "scrollHandleHeight", 8);
+    scaleAndInsert(mStyleSizes, "scrollHandleBorderWidth", 1);
+
+    int progressBackgroundDefaultHeight = 10;
+    scaleAndInsert(mStyleSizes, "progressBackgroundDefaultHeight", progressBackgroundDefaultHeight);
+    scaleAndInsert(mStyleSizes, "progressBackgroundRadius", progressBackgroundDefaultHeight/2);
+    scaleAndInsert(mStyleSizes, "progressBarDefaultHeight", 8);
+    scaleAndInsert(mStyleSizes, "progressBackgroundBorderWidth", 1);
+
+    scaleAndInsert(mStyleSizes, "navigationListHeight", 210);
+    scaleAndInsert(mStyleSizes, "navigationDelegateDefaultSize", 150);
+
+}
+
+void StyleHandling::initSpacings()
+{
+    scaleAndInsert(mSpacings, "defaultSpacing", 20);
+    scaleAndInsert(mSpacings, "smallSpacing", 10);
+    scaleAndInsert(mSpacings, "tinySpacing", 5);
+}
+
+void StyleHandling::initMargins()
+{
+    scaleAndInsert(mMargins, "defaultMargin", 20);
+    scaleAndInsert(mMargins, "smallMargin", 10);
+    scaleAndInsert(mMargins, "tinyMargin", 5);
+    scaleAndInsert(mMargins, "scrollHandleMargins", 1);
+}
+
+void StyleHandling::initPaddings()
+{
+    scaleAndInsert(mPaddings, "defaultPadding", 5);
+}
+
+void StyleHandling::scaleAndInsert(QQmlPropertyMap *map, const QString &key, int value)
+{
+    map->insert(key, applyRatio(value));
+}
+
+int StyleHandling::applyRatio(int size) const
+{
+    return size*mRatio;
+}
+
+void StyleHandling::init(QQmlContext *context)
+{
+    calculateAndSetRatio();
+    initStyleSizes();
+    initMargins();
+    initSpacings();
+    initPaddings();
+
+    context->setContextProperty("StyleSizes", mStyleSizes);
+    context->setContextProperty("StyleSpacings", mSpacings);
+    context->setContextProperty("StyleMargins", mMargins);
+    context->setContextProperty("StylePaddings", mPaddings);
+}