PlayerScreen: disallow navigation when toise pressed

qml/PlayerScreen.qml

@@ -38,6 +38,8 @@ Item {
 	// landscape / portrait
 	property bool is_portrait: height > width
 
+	property bool toisepressed: toise.pressed || toise_octave.pressed
+
 	// frequency and temperament
 	Column {
 		id: freq_temp

qml/Sailfish.qml

@@ -96,8 +96,12 @@ ApplicationWindow {
 			property bool playing: false
 			property bool tunerPlaying: playing && status == PageStatus.Active
 
+			backNavigation: !screen.toisepressed
+
 			SilicaFlickable {
+				id: flick
 				anchors.fill: parent
+				interactive: !screen.toisepressed
 
 				PullDownMenu {
 					MenuItem {

qml/ToiseFlickable.qml

@@ -32,10 +32,14 @@ Toise {
 	property double p_min: index2pos(min)
 	property double p_max: index2pos(max)
 
+	property alias pressed: area.pressed
+
 	signal released()
 	//animation_enabled: false
 
 	MouseArea {
+		id: area
+
 		property int refX: 0
 		property double refPos: parent.position