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using System;
using ElmSharp;
namespace Xamarin.Forms.Platform.Tizen
{
public class StepperRenderer : ViewRenderer<Stepper, Spinner>
{
public StepperRenderer()
{
RegisterPropertyHandler(Stepper.ValueProperty, UpdateValue);
RegisterPropertyHandler(Stepper.MinimumProperty, UpdateMinimum);
RegisterPropertyHandler(Stepper.MaximumProperty, UpdateMaximum);
RegisterPropertyHandler(Stepper.IncrementProperty, UpdateStep);
}
protected override void OnElementChanged(ElementChangedEventArgs<Stepper> e)
{
if (Control == null)
{
SetNativeControl(new Spinner(Forms.Context.MainWindow)
{
IsEditable = false,
});
Control.ValueChanged += OnValueChanged;
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (Control != null)
{
Control.ValueChanged -= OnValueChanged;
}
}
base.Dispose(disposing);
}
void OnValueChanged(object sender, EventArgs e)
{
double newValue = Control.Value;
((IElementController)Element).SetValueFromRenderer(Stepper.ValueProperty, newValue);
// Determines how many decimal places are there in current Stepper's value.
// The 15 pound characters below correspond to the maximum precision of Double type.
var decimalValue = Decimal.Parse(newValue.ToString("0.###############"));
// GetBits() method returns an array of four 32-bit integer values.
// The third (0-indexing) element of an array contains the following information:
// bits 00-15: unused, required to be 0
// bits 16-23: an exponent between 0 and 28 indicating the power of 10 to divide the integer number passed as a parameter.
// Conversely this is the number of decimal digits in the number as well.
// bits 24-30: unused, required to be 0
// bit 31: indicates the sign. 0 means positive number, 1 is for negative numbers.
//
// The precision information needs to be extracted from bits 16-23 of third element of an array
// returned by GetBits() call. Right-shifting by 16 bits followed by zeroing anything else results
// in a nice conversion of this data to integer variable.
var precision = (Decimal.GetBits(decimalValue)[3] >> 16) & 0x000000FF;
// Sets Stepper's inner label decimal format to use exactly as many decimal places as needed:
Control.LabelFormat = string.Format("%.{0}f", precision);
}
protected void UpdateValue()
{
Control.Value = Element.Value;
}
protected void UpdateMinimum()
{
Control.Minimum = Element.Minimum;
}
protected void UpdateMaximum()
{
Control.Maximum = Element.Maximum;
}
void UpdateStep()
{
Control.Step = Element.Increment;
}
}
}
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