Index: sources/gui/qml/components/RangeSlider.qml
===================================================================
diff -u -r0e1e685b6d5e0f837ed42a792f9099f78a018afa -r2ef03b2ce51b4dc507f66e9671953a8e0824bde9
--- sources/gui/qml/components/RangeSlider.qml	(.../RangeSlider.qml)	(revision 0e1e685b6d5e0f837ed42a792f9099f78a018afa)
+++ sources/gui/qml/components/RangeSlider.qml	(.../RangeSlider.qml)	(revision 2ef03b2ce51b4dc507f66e9671953a8e0824bde9)
@@ -1,13 +1,13 @@
 /*!
  *
- * Copyright (c) 2020-2023 Diality Inc. - All Rights Reserved.
+ * Copyright (c) 2020-2024 Diality Inc. - All Rights Reserved.
  * \copyright
  * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
  * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
  *
  * \file    RangeSlider.qml
  * \author  (last)      Behrouz NematiPour
- * \date    (last)      14-Mar-2023
+ * \date    (last)      31-Mar-2023
  * \author  (original)  Behrouz NematiPour
  * \date    (original)  17-Sep-2020
  *
@@ -51,6 +51,8 @@
     property real   maxValueLowerBound    : 0
     property real   maxValueUpperBound    : 0
 
+    property bool   lowerBoundValid : true
+    property bool   upperBoundValid : true
 
     property int    curHandler  : RangeSlider.HandlerOption.None    ///< current active slider handler
     property int    diameter    : Variables.progressbarHandler      ///< handlers diameter
@@ -103,15 +105,15 @@
     minimum         : 0
     maximum         : 0
 
-    /// Lable of the minimum of range
+    /// The label under the rangeSlider for minimum value
     minText {
         visible          : true
         anchors.topMargin: Variables.sliderTextMargin
         font.pixelSize   : Fonts.fontPixelSliderMarker
         font.bold        : false
     }
 
-    ///< Lable of the maximum of range
+    /// The label under the rangeSlider for maximum value
     maxText {
         visible          : true
         anchors.topMargin: Variables.sliderTextMargin
@@ -120,17 +122,21 @@
     }
 
     function incrementMax(vInStepSegments) {
-        updateMaxValue(vInStepSegments, true)
+        if ( ! maxAdjusted ) { setMaxValue(_root.maxValueUpperBound )}
+        else                 { updateMaxValue(vInStepSegments, true )}
     }
     function decrementMax(vInStepSegments) {
-        updateMaxValue(vInStepSegments, false)
+        if ( ! maxAdjusted ) { setMaxValue(_root.maxValueUpperBound )}
+        else                 { updateMaxValue(vInStepSegments, false)}
     }
 
     function incrementMin(vInStepSegments) {
-        updateMinValue(vInStepSegments, true)
+        if ( ! minAdjusted ) { setMinValue(_root.minValueLowerBound )}
+        else                 { updateMinValue(vInStepSegments, true )}
     }
     function decrementMin(vInStepSegments) {
-        updateMinValue(vInStepSegments, false)
+        if ( ! minAdjusted ) { setMinValue(_root.minValueLowerBound )}
+        else                 { updateMinValue(vInStepSegments, false)}
     }
     ///
     /// \brief   grays out the rangebar and handler if not adjusted and hasAdjust set to true
@@ -315,6 +321,14 @@
         setBound(newX)
     }
 
+    function getColor(vIsActive, vIsValid) {
+        let color = Colors.textMain
+        if ( ! vIsValid     ) { color = Colors.createTreatmentInvalidParam  ; return color }
+        if ( ! vIsActive    ) { color = Colors.textDisableButton            ; return color }
+        return color
+    }
+
+
     /// The main range rectangle bar - This is the "highlighted" area of the slider
     RangeRect { id: _rangeRect
         property alias  lowerBound  : _rangeRect.minimum
@@ -332,13 +346,15 @@
 
         decimal : _root.decimal
 
-        minText {
-            visible: false
+        minText { // The minimum value label above the handle
+            visible          : false
             anchors.topMargin: -60
+            color            : _root.getColor((_root.minAdjusted && _root.maxAdjusted), lowerBoundValid)
         }
-        maxText {
-            visible: false
+        maxText { // the maximum value label above the handle
+            visible          : false
             anchors.topMargin: -60
+            color            : _root.getColor((_root.minAdjusted && _root.maxAdjusted), upperBoundValid)
         }
 
         // propagation is not working on drag !