Polish MapViewer example

This patch does some improvements to the MapViewer example.
Namely:

- sliders, which have been problematic in many ways, are now from
QtQuickControls 2, and this solves a couple of glitches.

- changing map provider now retains tilt, bearing and field of view,
if possible.

- High DPI scaling is enabled by default in main()

- the slider panel is open at start

Change-Id: I1cc380e3d05b89aa547139d912c142e4f0d266c9
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/examples/location/mapviewer/mapviewer.qml b/examples/location/mapviewer/mapviewer.qml
index 21348919..debc329f 100644
--- a/examples/location/mapviewer/mapviewer.qml
+++ b/examples/location/mapviewer/mapviewer.qml
@@ -73,10 +73,18 @@ ApplicationWindow {
         }
 
         var zoomLevel = null
+        var tilt = null
+        var bearing = null
+        var fov = null
         var center = null
+        var panelExpanded = null
         if (map) {
             zoomLevel = map.zoomLevel
+            tilt = map.tilt
+            bearing = map.bearing
+            fov = map.fieldOfView
             center = map.center
+            panelExpanded = map.slidersExpanded
             map.destroy()
         }
 
@@ -84,8 +92,12 @@ ApplicationWindow {
         map.plugin = plugin;
 
         if (zoomLevel != null) {
+            map.tilt = tilt
+            map.bearing = bearing
+            map.fieldOfView = fov
             map.zoomLevel = zoomLevel
             map.center = center
+            map.slidersExpanded = panelExpanded
         } else {
             // Use an integer ZL to enable nearest interpolation, if possible.
             map.zoomLevel = Math.floor((map.maximumZoomLevel - map.minimumZoomLevel)/2)