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OpenWPFChart: assembling charts from components: Part I - Parts

, 19 Mar 2009
Provides the component model along with base components to assemble charts.
SourceCode.zip
trunk
ChartControls
ChartControls.csproj.user
OpenWPFChart.Chart.Icon.png
OpenWPFChart.WellLogChart.Icon.png
Properties
Themes
ChartHelpers
AxisPropertiesDialog
ChartHelpers.csproj.user
ChartScaleControl
FontChooser
ItemPropertiesDialog
Properties
ChartParts
Axes
ChartParts.csproj.user
Grid
Items
Data
DataView
Elements
Visuals
NumericalRecipes
Properties
Scales
ChartParts.vsmdi
SampleDataFiles
WellLog
Samples
ControlSamples
ColumnChartControlSample
Properties
Settings.settings
CurveChartControlSample
Properties
Settings.settings
WellLogControlSample
Properties
Settings.settings
DirectCompositionSamples
BasicSample
Properties
Settings.settings
TemperatureSample
Properties
Settings.settings
WellLogSample
Properties
Settings.settings
// <copyright file="GenericDataTemplateSelector.cs" company="Oleg V. Polikarpotchkin">
// Copyright © 2008 Nick Zhebrun.
// </copyright>
// <author>Nick Zhebrun</author>
// <author>Oleg V. Polikarpotchkin</author>
// <email>ov-p@yandex.ru</email>
// <date>2009-01-21</date>
// <summary>OpenWPFChart library. Modified GenericDataTemplateSelector by Nick Zhebrun 
// (http://zhebrun.blogspot.com/2008/09/are-you-tired-to-create.html).
// </summary>
// <revision>$Id: GenericDataTemplateSelector.cs 18093 2009-03-16 04:15:06Z unknown $</revision>

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;

namespace OpenWPFChart.Parts
{
	/// <summary>
	/// Generic DataTemplateSelector based on the value of the property of the Item templated.
	/// </summary>
	/// <remarks>
	/// <para>Modified version of GenericDataTemplateSelector proposed by Nick Zhebrun 
	/// (<see href="http://zhebrun.blogspot.com/2008/09/are-you-tired-to-create.html">see http://zhebrun.blogspot.com/2008/09/are-you-tired-to-create.html</see>).
	/// </para>
	/// <para>Changes:
	/// <list type="number">
	/// <item>ContentPropertyAttribute added to the class.</item>
	/// <item>Property DataTemplateSelectorItems renamed to SelectorItems and made read only.</item>
	/// <item>Type of SelectorItems changed to Collection&lt;&gt;.</item>
	/// <item>SelectorItems collection is created on construction.</item>
	/// <item>Item type is checked in SelectTemplate override to decide if the template 
	/// could be applied to it.</item>
	/// <item>External Reflector type replaced with TypeDescriptor.</item>
	/// </list>
	/// </para>
	/// </remarks>
	/// <seealso cref="T:OpenWPFChart.GenericDataTemplateSelectorItem"/>
	[ContentProperty("SelectorItems")]
	public class GenericDataTemplateSelector : DataTemplateSelector
	{
		Collection<GenericDataTemplateSelectorItem> selectorItems = new Collection<GenericDataTemplateSelectorItem>();
		/// <summary>
		/// Gets the collection of selector items.
		/// </summary>
		/// <value>The selector items collection.</value>
		public Collection<GenericDataTemplateSelectorItem> SelectorItems 
		{ 
			get { return selectorItems;  }
		}

		/// <summary>
		/// When overridden in a derived class, returns a 
		/// <see cref="T:System.Windows.DataTemplate"/> based on custom logic.
		/// </summary>
		/// <param name="item">The data object for which to select the template.</param>
		/// <param name="container">The data-bound object.</param>
		/// <returns>
		/// Returns a <see cref="T:System.Windows.DataTemplate"/> or null. The default value is null.
		/// </returns>
		public override DataTemplate SelectTemplate(object item, DependencyObject container)
		{
			if (item != null)
			{
				foreach (GenericDataTemplateSelectorItem selectorItem in SelectorItems)
				{
					// If the TemplatedType is specified we check the item has that type.
					if (selectorItem.TemplatedType != null && item.GetType() != selectorItem.TemplatedType)
						continue;

					// If the property exists on item and its value matches with the value provided
					// then select that template.
					PropertyDescriptor propertyDescriptor = TypeDescriptor.GetProperties(item)[selectorItem.PropertyName];
					if (propertyDescriptor != null && selectorItem.Value.Equals(propertyDescriptor.GetValue(item)))
						return selectorItem.Template;
				}
			}
			return null;
		}
	}

	/// <summary>
	/// Associates the named property value with DataTemplate.
	/// </summary>
	/// <remarks>
	/// <para>Modified GenericDataTemplateSelector by Nick Zhebrun 
	/// (<see href="http://zhebrun.blogspot.com/2008/09/are-you-tired-to-create.html">see http://zhebrun.blogspot.com/2008/09/are-you-tired-to-create.html</see>).
	/// <para>Changes:
	/// <list type="number">
	/// <item>GenericDataTemplateSelectorItem type changed to struct.</item>
	/// <item>Value property type changed to object to be more generic.</item>
	/// <item>TemplatedType property added to allow to chech the templated item has that type 
	/// or is derived from it.</item>
	/// <item>Description property added. It could be used in UI to allow the user to select one or 
	/// other template.</item>
	/// </list>
	/// </para></para>
	/// </remarks>
	/// <seealso cref="T:OpenWPFChart.GenericDataTemplateSelector"/>
	public struct GenericDataTemplateSelectorItem
	{
		/// <summary>
		/// Gets or sets the name of the property of the data item which 
		/// is used as a template selector.
		/// </summary>
		/// <value>The name of the property.</value>
		public string PropertyName { get; set; }
		/// <summary>
		/// Gets or sets the value of the property that triggers the DataTemplate 
		/// association.
		/// </summary>
		/// <value>The value.</value>
		public object Value { get; set; }
		/// <summary>
		/// Gets or sets the DataTemplate.
		/// </summary>
		/// <value>The DataTemplate.</value>
		public DataTemplate Template { get; set; }
		/// <summary>
		/// Gets or sets the type of the templated data item to which template could be applied.
		/// The templated item must have the TemplatedType or be derived from it.
		/// </summary>
		/// <value>The type of the templated item or null.</value>
		public Type TemplatedType { get; set; }
		/// <summary>
		/// Gets or sets the user-readable description.
		/// It could be used in UI to allow the user to select one or other template.
		/// </summary>
		/// <value>The description.</value>
		public string Description { get; set; }
	}
}

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About the Author

Oleg V. Polikarpotchkin
Team Leader
Russian Federation Russian Federation
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