Theme tweaks

- gridUnits is dynamic again, using FontMetrics now
- Add a page to display some sizing-relevant details, so we can debug
  dpi problems a bit better on Android

Signed-off-by: Sebastian Kügler <sebas@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-mobile/ThemeTest.qml

@@ -0,0 +1,15 @@
+import QtQuick 2.5
+import QtQuick.Layouts 1.1
+
+ColumnLayout {
+	id: themetest
+
+	Text {
+		text: "units.gridUnit is: " + units.gridUnit
+	}
+
+	Text {
+		text: "units.devicePixelRatio: " + units.devicePixelRatio
+
+	}
+}

qt-mobile/main.qml

@@ -72,6 +72,13 @@ ApplicationWindow {
 				stackView.push(logWindow)
 			}
 		}
+
+		MenuItem {
+			text: "Theme Information"
+			onTriggered: {
+				stackView.push(themetest)
+			}
+		}
 	}
 
 	StackView {
@@ -201,6 +208,11 @@ ApplicationWindow {
 		visible: false
 	}
 
+	ThemeTest {
+		id: themetest
+		visible: false
+	}
+
 	Component.onCompleted: {
 		print("units.gridUnit is: " + units.gridUnit);
 	}

qt-mobile/mobile-resources.qrc

@@ -8,6 +8,7 @@
         <file>DownloadFromDiveComputer.qml</file>
         <file>Log.qml</file>
 		<file>TopBar.qml</file>
+		<file>ThemeTest.qml</file>
 		<file alias="subsurface-mobile-icon.png">../icons/subsurface-mobile-icon.png</file>
     </qresource>
     <qresource prefix="/qml/theme">

qt-mobile/theme/Units.qml

@@ -31,7 +31,7 @@ QtObject {
      * Given the screen has an accurate DPI settings, it corresponds to a width of
      * the capital letter M
      */
-    property int gridUnit: 20
+    property int gridUnit: fontMetrics.height
 
     /**
      * units.iconSizes provides access to platform-dependent icon sizing
@@ -95,8 +95,8 @@ QtObject {
      */
     property int shortDuration: 150
 
-//     property QtObject fontMetrics: FontMetrics {
-//         //id: textSpacer
-//         //text: "M"
-//     }
+    property QtObject fontMetrics: FontMetrics {
+        //id: textSpacer
+        //text: "M"
+    }
 }