Build Your Own DataGrid for Silverlight: Step 2

// 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;

namespace Open.Windows.Controls
{
    /// <summary>
    /// Content control that the user can resize. The Sizer control allows being resized only if the new size is 'accepted' by its content. 
    /// </summary>
    public class HandySizer : Netika.Windows.Controls.Sizer
    {
        public static readonly DependencyProperty HandyStyleProperty;

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

        public HandySizer()
        {
            DefaultStyleKey = typeof(HandySizer);
            this.LayoutUpdated += new EventHandler(HandySizer_LayoutUpdated);
        }

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

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


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

                    if (templateLoaded && !onHandyStyleAppliedEventCalled)
                        OnHandyStyleApplied(EventArgs.Empty);
                }
            }
        }

        /// <summary>
        /// This event occurs when the real style linked to the HandyStyle has been applied to the control. 
        /// </summary>
        public event EventHandler HandyStyleApplied;
        protected virtual void OnHandyStyleApplied(EventArgs e)
        {
            if (HandyStyleApplied != null)
                HandyStyleApplied(this, e);
        }

        private bool onHandyStyleAppliedEventCalled;
        private bool templateLoaded;
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            if (handyStyleApplied)
            {
                if (!onHandyStyleAppliedEventCalled)
                {
                    OnHandyStyleApplied(EventArgs.Empty);
                    onHandyStyleAppliedEventCalled = true;
                }
            }

            templateLoaded = true;

        }
    }
}