Using a Picker to set new value

source/factory/HomeAssistantNumericFactory.mc

@@ -0,0 +1,88 @@
+//-----------------------------------------------------------------------------------
+//
+// Distributed under MIT Licence
+//   See https://github.com/house-of-abbey/GarminHomeAssistant/blob/main/LICENSE.
+//
+//-----------------------------------------------------------------------------------
+//
+// GarminHomeAssistant is a Garmin IQ application written in Monkey C and routinely
+// tested on a Venu 2 device. The source code is provided at:
+//            https://github.com/house-of-abbey/GarminHomeAssistant.
+//
+// P A Abbey & J D Abbey & Someone0nEarth, 31 October 2023
+//
+//------------------------------------------------------------
+
+import Toybox.Graphics;
+import Toybox.Lang;
+import Toybox.WatchUi;
+
+//! Factory that controls which numbers can be picked
+class HomeAssistantNumericFactory extends WatchUi.PickerFactory {
+    // define default values in case not contained in data
+    private var mStart as Lang.Float = 0.0;
+    private var mStop as Lang.Float = 100.0;
+    private var mStep as Lang.Float = 1.0;
+    private var mFormatString as Lang.String = "%.2f";
+
+    //! Class Constructor
+    //!
+    public function initialize(data as Lang.Dictionary) {
+        PickerFactory.initialize();
+
+        // Get values from data
+
+        var val = data.get("start");
+        if (val != null) {
+            mStart = val.toString().toFloat();
+        }
+        val = data.get("stop");
+        if (val != null) {
+            mStop = val.toString().toFloat();
+        } 
+        val = data.get("step");
+        if (val != null) {
+            mStep = val.toString().toFloat();
+        } 
+       val = data.get("formatString");
+        if (val != null) {
+            mFormatString = val.toString();
+        } 
+
+    }
+
+    //! Get the index of a number item
+    //! @param value The number to get the index of
+    //! @return The index of the number
+    public function getIndex(value as Float) as Number {
+        return ((value / mStep) - mStart).toNumber();
+    }
+
+    //! Generate a Drawable instance for an item
+    //! @param index The item index
+    //! @param selected true if the current item is selected, false otherwise
+    //! @return Drawable for the item
+    public function getDrawable(index as Number, selected as Boolean) as Drawable? {
+        var value = getValue(index);
+        var text = "No item";
+        if (value instanceof Float) {
+            text = value.format(mFormatString);
+        }
+        return new WatchUi.Text({:text=>text, :color=>Graphics.COLOR_WHITE, 
+            :locX=>WatchUi.LAYOUT_HALIGN_CENTER, :locY=>WatchUi.LAYOUT_VALIGN_CENTER});
+    }
+
+    //! Get the value of the item at the given index
+    //! @param index Index of the item to get the value of
+    //! @return Value of the item
+    public function getValue(index as Number) as Object? {
+        return mStart + (index * mStep);
+    }
+
+    //! Get the number of picker items
+    //! @return Number of items
+    public function getSize() as Number {
+        return ((mStop - mStart) / mStep).toNumber() + 1;
+    }
+
+}