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What is the method to mention a personalized slider within a listview on Xamarin Forms?

asked 2021-11-17 11:00:00 +0000

scrum gravatar image

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answered 2021-08-13 08:00:00 +0000

plato gravatar image

To mention a personalized slider within a listview on Xamarin Forms, the following steps can be followed:

  1. Create a ViewModel for the slider and set the slider value and minimum/maximum values.
  2. Create a custom ViewCell with a Slider control and bind the Slider control's properties to the ViewModel properties.
  3. In the ListView's ItemTemplate, set the ViewCell to the custom ViewCell.
  4. Set the ListView's ItemsSource property to a collection of the ViewModel objects.

Here is an example of the code:

ViewModel:

public class SliderViewModel : INotifyPropertyChanged
{
    private double value;
    public double Value
    {
        get { return value; }
        set
        {
            if (this.value != value)
            {
                this.value = value;
                OnPropertyChanged("Value");
            }
        }
    }

    private double min = 0;
    public double Min
    {
        get { return min; }
        set
        {
            if (min != value)
            {
                min = value;
                OnPropertyChanged("Min");
            }
        }
    }

    private double max = 100;
    public double Max
    {
        get { return max; }
        set
        {
            if (max != value)
            {
                max = value;
                OnPropertyChanged("Max");
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

Custom ViewCell:

public class SliderViewCell : ViewCell
{
    public SliderViewCell()
    {
        var slider = new Slider();
        slider.SetBinding(Slider.ValueProperty, new Binding("Value"));
        slider.SetBinding(Slider.MinimumProperty, new Binding("Min"));
        slider.SetBinding(Slider.MaximumProperty, new Binding("Max"));

        View = slider;
    }
}

ListView:

var viewModel = new ObservableCollection<SliderViewModel>();
// Add some sliders to the viewModel collection

var listView = new ListView();
listView.ItemTemplate = new DataTemplate(typeof(SliderViewCell));
listView.ItemsSource = viewModel;
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Asked: 2021-11-17 11:00:00 +0000

Seen: 17 times

Last updated: Aug 13 '21