NIconButton: added native tooltip handling

Widgets/NIconButton.qml

@@ -11,6 +11,7 @@ Rectangle {
   property real sizeMultiplier: 0.8
   property real size: Style.baseWidgetSize * sizeMultiplier * scaling
   property string icon
+  property string tooltipText
   property bool enabled: true
   property bool hovering: false
   property var onEntered: function () {}
@@ -37,16 +38,29 @@ Rectangle {
     opacity: root.enabled ? Style.opacityFull : Style.opacityMedium
   }
 
+  NTooltip {
+    id: tooltip
+    target: root
+    positionAbove: false
+    text: root.tooltipText
+  }
+
   MouseArea {
     anchors.fill: parent
     cursorShape: Qt.PointingHandCursor
     hoverEnabled: true
     onEntered: {
       hovering = true
+      if (tooltipText) {
+        tooltip.show()
+      }
       root.onEntered()
     }
     onExited: {
       hovering = false
+      if (tooltipText) {
+        tooltip.hide()
+      }
       root.onExited()
     }
     onClicked: {