Build Your Own DataGrid for Silverlight: Step 3

// Copyright 2008-2009 NETiKA TECH.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Windows;
using System.Windows.Controls;

namespace Open.Windows.Controls
{
    /// <summary>
    /// The HandyListBox control inherits from the Silverlight ListBox. It adds HandyStyle features to it.
    /// </summary>
    public class HandyListBox: ListBox
    {
        public static readonly DependencyProperty HandyStyleProperty;

        static HandyListBox()
        {
            HandyStyleProperty = DependencyProperty.Register("HandyStyle", typeof(HandyListBoxStyle), typeof(HandyListBox), null);
            
        }

        public HandyListBox()
        {
            DefaultStyleKey = typeof(HandyListBox);
            this.LayoutUpdated += new EventHandler(HandyListBox_LayoutUpdated);
            
        }

        private void HandyListBox_LayoutUpdated(object sender, EventArgs e)
        {
            if (!handyStyleApplied)
            {
                this.ApplyHandyStyle();
            }
        }

        /// <summary>
        /// The Style to apply to the control  
        /// </summary>
        public HandyListBoxStyle HandyStyle
        {
            get
            {
                return (HandyListBoxStyle)this.GetValue(HandyStyleProperty);
            }
            set
            {
                base.SetValue(HandyStyleProperty, value);
            }
        }


        private bool handyStyleApplied;
        private void ApplyHandyStyle()
        {
            Style style = ResourceHelper.FindResource(Enum.GetName(typeof(HandyListBoxStyle), HandyStyle)) as Style;
            if (style != null)
            {
                if (this.Style == null)
                {
                    this.Style = style;
                    handyStyleApplied = true;
                }
            }
        }

        protected override bool IsItemItsOwnContainerOverride(object item)
        {
            return item is HandyListBoxItem;
        }

        protected override DependencyObject GetContainerForItemOverride()
        {
            HandyListBoxItem item = new HandyListBoxItem();
            if (this.ItemContainerStyle != null)
            {
                item.Style = this.ItemContainerStyle;
            }
            return item;
        }

    }
}