Adding a RoundButton element.

Also moving the Plan View tool bar buttons into a Row element.

qgroundcontrol.qrc

@@ -114,6 +114,7 @@
         <file alias="QGroundControl/Controls/MissionItemSummary.qml">src/QmlControls/MissionItemSummary.qml</file>
         <file alias="QGroundControl/Controls/MissionItemEditor.qml">src/QmlControls/MissionItemEditor.qml</file>
         <file alias="QGroundControl/Controls/DropButton.qml">src/QmlControls/DropButton.qml</file>
+        <file alias="QGroundControl/Controls/RoundButton.qml">src/QmlControls/RoundButton.qml</file>
         <file alias="QGroundControl/Controls/QGCCanvas.qml">src/QmlControls/QGCCanvas.qml</file>
 
         <!-- Vehicle Setup -->

src/QmlControls/QGroundControl.Controls.qmldir

@@ -14,6 +14,7 @@ QGCCanvas           1.0 QGCCanvas.qml
 SubMenuButton       1.0 SubMenuButton.qml
 IndicatorButton     1.0 IndicatorButton.qml
 DropButton          1.0 DropButton.qml
+RoundButton         1.0 RoundButton.qml
 VehicleRotationCal  1.0 VehicleRotationCal.qml
 VehicleSummaryRow   1.0 VehicleSummaryRow.qml
 ViewWidget          1.0 ViewWidget.qml

src/QmlControls/RoundButton.qml

+import QtQuick                  2.4
+import QtQuick.Controls         1.2
+import QtQuick.Controls.Styles  1.2
+
+import QGroundControl.ScreenTools   1.0
+
+Item {
+    id: _root
+
+    signal          clicked()
+    property alias  buttonImage:        button.source
+    property real   radius:             (ScreenTools.defaultFontPixelHeight * 3) / 2
+
+    width:  radius * 2
+    height: radius * 2
+
+    Rectangle {
+        anchors.fill:   parent
+        radius:         width / 2
+        border.width:   2
+        border.color:   "white"
+        color:          "transparent"
+        Image {
+            id:             button
+            anchors.fill:   parent
+            fillMode:       Image.PreserveAspectFit
+            mipmap:         true
+            smooth:         true
+            MouseArea {
+                anchors.fill:   parent
+                onClicked:      _root.clicked()
+            }
+        }
+    }
+}