111 lines
2.3 KiB
C#
111 lines
2.3 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Windows;
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using Xamarin.Forms;
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namespace DataDisplay.DataSource
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{
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public class EnumerableDataSource<T> : EnumerableDataSourceBase<T>
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{
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public EnumerableDataSource(IEnumerable<T> data) : base(data) { }
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public EnumerableDataSource(IEnumerable data) : base(data) { }
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private readonly List<Mapping<T>> mappings = new List<Mapping<T>>();
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private Func<T, double> xMapping;
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private Func<T, double> yMapping;
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private Func<T, Point> xyMapping;
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public Func<T, double> XMapping
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{
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get { return xMapping; }
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set { SetXMapping(value); }
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}
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public Func<T, double> YMapping
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{
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get { return yMapping; }
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set { SetYMapping(value); }
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}
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public Func<T, Point> XYMapping
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{
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get { return xyMapping; }
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set { SetXYMapping(value); }
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}
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public void SetXMapping(Func<T, double> mapping)
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{
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if (mapping == null)
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throw new ArgumentNullException("mapping");
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this.xMapping = mapping;
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RaiseDataChanged();
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}
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public void SetYMapping(Func<T, double> mapping)
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{
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if (mapping == null)
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throw new ArgumentNullException("mapping");
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this.yMapping = mapping;
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RaiseDataChanged();
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}
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public void SetXYMapping(Func<T, Point> mapping)
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{
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if (mapping == null)
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throw new ArgumentNullException("mapping");
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this.xyMapping = mapping;
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RaiseDataChanged();
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}
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public void AddMapping(BindableProperty property, Func<T, object> mapping)
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{
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if (property == null)
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throw new ArgumentNullException("property");
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if (mapping == null)
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throw new ArgumentNullException("mapping");
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mappings.Add(new Mapping<T> { Property = property, F = mapping });
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}
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public override IPointEnumerator GetEnumerator(BindableObject context)
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{
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return new EnumerablePointEnumerator<T>(this);
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}
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internal void FillPoint(T elem, ref Point point)
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{
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if (xyMapping != null)
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{
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point = xyMapping(elem);
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}
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else
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{
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if (xMapping != null)
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{
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point.X = xMapping(elem);
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}
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if (yMapping != null)
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{
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point.Y = yMapping(elem);
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}
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}
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}
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internal void ApplyMappings(BindableObject target, T elem)
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{
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if (target != null)
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{
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foreach (var mapping in mappings)
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{
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target.SetValue(mapping.Property, mapping.F(elem));
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}
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}
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}
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}
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}
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