public static IEnumerable <T> GetAutoFilterValues <T>(IEnumerable <T> source, DataGridColumn column)
{
var grid = column.DataGrid;
// get all filter states without taking the current column into account
var filterStates = grid.FilteredColumns
.Where(c => c != column)
.Select(c => new DataGridColumnValue <DataGridFilterState>(c, c.FilterState));
var filter = C1DataGridFilterHelper.BuildFilterPredicate <T>(filterStates.ToArray(), DataGridFilterCombination.And);
if (filter == null)
{
return(source);
}
var filteredElements = new List <T>();
foreach (var elem in source)
{
if (filter(elem))
{
filteredElements.Add(elem);
}
}
return(filteredElements);
}
public override IDataGridFilter GetFilter()
{
var colorsFilter = new DataGridMultiValueFilter();
colorsFilter.ItemTemplate = XamlReader.Parse(@"<DataTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"" xmlns:local=""clr-namespace:DataGridSamples;assembly=" + new AssemblyName(Assembly.GetExecutingAssembly().FullName).Name + @""" xmlns:c1=""http://schemas.componentone.com/winfx/2006/xaml"">
<StackPanel Orientation=""Horizontal"">
<StackPanel.Resources>
<local:ColorConverter x:Key=""colorConverter""/>
</StackPanel.Resources>
<c1:C1CheckeredBorder BorderThickness=""1"" BorderBrush=""Black"" Background=""{Binding Converter={StaticResource colorConverter}}"" Width=""12"" Height=""12"" VerticalAlignment=""Center""/>
<TextBlock Text=""{Binding}"" VerticalAlignment=""Center"" Margin=""2 0 0 0 ""/>
</StackPanel>
</DataTemplate>") as DataTemplate;
colorsFilter.SetBinding(DataGridMultiValueFilter.ItemsSourceProperty, new Binding("ItemsSource")
{
Source = DataGrid,
Converter = CustomConverter.Create((value, type, parameter, culture) =>
{
if (value is IEnumerable)
{
var enumerable = ((IEnumerable)value).Cast <object>();
var colorConverter = new ColorConverter();
return(enumerable.Select(o => C1DataGridFilterHelper.GetPropertyValue <object>(o, FilterMemberPath)).Distinct().Select(o => (Color)colorConverter.Convert(o, typeof(Color), null, CultureInfo.CurrentCulture)).OrderBy(c => new C1HslColor(c).Hue));
}
return(value);
})
});
colorsFilter.SetBinding(DataGridMultiValueFilter.BackgroundProperty, new Binding("HeaderBackground")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.ForegroundProperty, new Binding("HeaderForeground")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.BorderBrushProperty, new Binding("BorderBrush")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.MouseOverBrushProperty, new Binding("MouseOverBrush")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.PressedBrushProperty, new Binding("PressedBrush")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.FocusBrushProperty, new Binding("SelectedBackground")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.InputBackgroundProperty, new Binding("RowBackground")
{
Source = DataGrid
});
colorsFilter.SetBinding(DataGridMultiValueFilter.InputForegroundProperty, new Binding("RowForeground")
{
Source = DataGrid
});
var filter = new DataGridContentFilter
{
Content = new DataGridFilterList
{
Items = new List <IDataGridFilterUnity>
{
new DataGridTextFilter(),
colorsFilter,
}
}
};
return(filter);
}
//------------------------------------------------------------------
#region ** implementation
void UpdateHistogram()
{
// get items source
var items = ItemsSource == null ? new List <object>() : ItemsSource.Cast <object>();
try
{
_values = items.Select(o => C1DataGridFilterHelper.GetPropertyValue <double>(o, ValueMemberPath)).ToList();
}
catch
{
_values = new List <double>();
}
if (_values == null || _values.Count == 0)
{
Points = null;
return;
}
// get range, bin count
_calculatedMinimum = _values.Min();
_calculatedMaximum = _values.Max();
var min = Minimum;
var max = Maximum;
var range = max - min;
var binSize = range / BinCount;
// group values in bins
var bins = new int[BinCount];
foreach (var d in _values)
{
if (d >= min && d <= max)
{
var bin = (int)((d - min) / range * BinCount);
if (bin < 0 || bin >= bins.Length)
{
bin = 0;
}
bins[bin]++;
}
}
// plot values
var pc = new PointCollection();
pc.Add(new Point(0, 0));
for (int i = 0; i < BinCount; i++)
{
pc.Add(new Point(i, bins[i]));
pc.Add(new Point(i + 1, bins[i]));
}
pc.Add(new Point(BinCount, 0));
// update control
Points = pc;
RaisePropertyChanged("Maximum");
RaisePropertyChanged("Minimum");
RaisePropertyChanged("LowerValue");
RaisePropertyChanged("UpperValue");
}
