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Auto-filter for Microsoft WPF DataGrid

, 29 Jan 2009 Eclipse
Allows auto filtering functionality for DataGrid columns.
WPFGridFilter.zip
WPFGridFilter
PowerCollections
PowerCollections.csproj.user
Properties
Stepi.Collections
bin
Filters
Properties
Stepi.UIFilters
bin
Initializers
Properties
Settings.settings
Themes
Test.GridSorting
bin
Debug
Test.GridFilter.vshost.exe
Properties
Settings.settings
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System;

namespace Stepi.UIFilters
{
    /// <summary>
    /// 
    /// </summary>
    [TemplatePart(Name=RangeFilterView.PART_FromInput, Type = typeof(TextBox))]
    [TemplatePart(Name = RangeFilterView.PART_ToInput, Type = typeof(TextBox))]
    public class RangeFilterView : FilterViewBase<IRangeFilterPresentationModel>
    {
        internal const string PART_FromInput = "PART_From";
        internal const string PART_ToInput = "PART_To";

        private TextBox _txtFrom;
        private TextBox _txtTo;

        /// <summary>
        /// Initializes a new instance of the <see cref="RangeFilterView"/> class.
        /// </summary>
        public RangeFilterView()
        {
            DefaultStyleKey = typeof(RangeFilterView);
        }

        /// <summary>
        /// Called when [apply template].
        /// </summary>
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            //if (_txtFrom != null)
            //{
            //    _txtFrom.BindingValidationError -= new System.EventHandler<ValidationErrorEventArgs>(OnBindingValidationError);
            //}
            _txtFrom = GetTemplateChild(PART_FromInput) as TextBox;

            //if (_txtTo != null)
            //{
            //    _txtTo.BindingValidationError += new System.EventHandler<ValidationErrorEventArgs>(OnBindingValidationError);
            //}
            _txtTo = GetTemplateChild(PART_ToInput) as TextBox;
            
            InitialiseBindings();
        }

        /// <summary>
        /// Gets or sets the model.
        /// </summary>
        /// <value>The model.</value>
        public override IRangeFilterPresentationModel Model
        {
            get { return base.Model; }
            set
            {
                if (base.Model != value)
                {
                    base.Model = value;
                    InitialiseBindings();
                }
            }
        }

        /// <summary>
        /// Initialises the bindings.
        /// </summary>
        private void InitialiseBindings()
        {            
            IRangeFilterPresentationModel model = Model;
            if (model != null)
            {
                if (_txtFrom != null)
                {
                    _txtFrom.SetBinding(TextBox.TextProperty, CreateTextBoxBinding(model, "From"));
                    //_txtFrom.BindingValidationError += new System.EventHandler<ValidationErrorEventArgs>(OnBindingValidationError);
                }
                if (_txtTo != null)
                {
                    _txtTo.SetBinding(TextBox.TextProperty, CreateTextBoxBinding(model, "To"));
                    //_txtTo.BindingValidationError += new System.EventHandler<ValidationErrorEventArgs>(OnBindingValidationError);
                }
            }
        }

        /// <summary>
        /// Called when [binding validation error].
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The <see cref="System.Windows.Controls.ValidationErrorEventArgs"/> instance containing the event data.</param>
        [Obsolete]
        private void OnBindingValidationError(object sender, ValidationErrorEventArgs e)
        {
            IRangeFilterPresentationModel model = Model;
            if(model != null)
            {
                bool state = (e.Action == ValidationErrorEventAction.Removed);
                model.CanApply = state;
                if (!state)
                {
                    model.IsActive = state;
                }
            }
        }

        /// <summary>
        /// Creates the text box binding.
        /// </summary>
        /// <param name="model">The model.</param>
        /// <param name="path">The path.</param>
        /// <returns></returns>
        private static Binding CreateTextBoxBinding(IRangeFilterPresentationModel model, string path)
        {
            Binding binding = new Binding();
            binding.Source = model;
            binding.ValidatesOnExceptions = true;
            binding.NotifyOnValidationError = true;
            binding.Mode = BindingMode.TwoWay;
            binding.Path = new PropertyPath(path);
            return binding;
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The Eclipse Public License 1.0

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About the Author

Stefan Bocutiu
Software Developer (Senior) Lab49
United Kingdom United Kingdom
No Biography provided

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