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Adding is reversed property #72

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Adding is reversed property #72

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520b706
Added IsReversed Property
MykhailoDav Mar 28, 2025
f378fce
Added CheckBox for IsReversed Property on sample
MykhailoDav Mar 28, 2025
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13 changes: 11 additions & 2 deletions src/AlohaKit.Gallery/Views/SliderView.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -125,8 +125,17 @@
</StackLayout>
</StackLayout>
<VerticalStackLayout Grid.Row="3">
<Label HorizontalOptions="Center" Text="{Binding Source={x:Reference Slider}, Path=Value}" />
<controls:Slider x:Name="Slider" />
<Label HorizontalOptions="Center"
Text="{Binding Source={x:Reference Slider}, Path=Value}"/>
<controls:Slider x:Name="Slider"
IsReversed="{Binding IsChecked, Source={x:Reference IsReversedCheckBox}, x:DataType=controls:CheckBox}"/>
</VerticalStackLayout>
<VerticalStackLayout Grid.Row="4"
Margin="20"
Spacing="10"
HorizontalOptions="Center">
<Label Text="Is Reversed"/>
<controls:CheckBox x:Name="IsReversedCheckBox"/>
</VerticalStackLayout>
</Grid>
</ContentPage>
35 changes: 31 additions & 4 deletions src/AlohaKit/Controls/Slider/Slider.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,23 @@ public ThumbShape ThumbShape
set => SetValue(ThumbShapeProperty, value);
}

public static readonly BindableProperty IsReversedProperty =
BindableProperty.Create(nameof(IsReversed), typeof(bool), typeof(Slider), false,
propertyChanged: (bindableObject, oldValue, newValue) =>
{
if (newValue != null && bindableObject is Slider slider)
{
slider.UpdateValue();
slider.ValueChanged?.Invoke(slider, new ValueChangedEventArgs((double)oldValue, (double)newValue));
}
});

public bool IsReversed
{
get => (bool)GetValue(IsReversedProperty);
set => SetValue(IsReversedProperty, value);
}

public event EventHandler<ValueChangedEventArgs> ValueChanged;

protected override void OnParentSet()
Expand Down Expand Up @@ -182,7 +199,7 @@ void UpdateMinimum()
if (SliderDrawable == null)
return;

SliderDrawable.Minimum = Minimum;
SliderDrawable.Minimum = IsReversed ? Maximum : Minimum;

Invalidate();
}
Expand All @@ -192,7 +209,7 @@ void UpdateMaximum()
if (SliderDrawable == null)
return;

SliderDrawable.Maximum = Maximum;
SliderDrawable.Maximum = IsReversed ? Minimum : Maximum;

Invalidate();
}
Expand All @@ -203,7 +220,15 @@ void UpdateValue()
return;

Value = Math.Clamp(Value, Minimum, Maximum);
SliderDrawable.Value = Value;

double adjustedValue = Value;

if (IsReversed)
{
adjustedValue = Maximum - (Value - Minimum);
}

SliderDrawable.Value = adjustedValue;

Invalidate();
}
Expand Down Expand Up @@ -262,7 +287,9 @@ void OnSliderDragInteraction(object sender, TouchEventArgs args)

void UpdateValueFromInteraction(PointF touchPoint)
{
Value = touchPoint.X * Maximum / Width;
double adjustedTouchPointX = IsReversed ? (Width - touchPoint.X) : touchPoint.X;

Value = adjustedTouchPointX * Maximum / Width;
}
}
}
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