DataTemplate.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / DataTemplate.cs / 1305600 / DataTemplate.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: DataTemplate describes how to display a single data item. 
// 
// Specs:       http://avalon/coreui/Specs%20%20Property%20Engine/Styling%20Revisited.doc
// 
//---------------------------------------------------------------------------

using System.ComponentModel;
using System.Windows.Controls; 
using System.Windows.Markup;
 
namespace System.Windows 
{
    ///  
    ///     DataTemplate describes how to display a single data item.
    /// 
    [DictionaryKeyProperty("DataTemplateKey")]
    public class DataTemplate : FrameworkTemplate 
    {
        #region Constructors 
 
        //-------------------------------------------------------------------
        // 
        //  Constructors
        //
        //-------------------------------------------------------------------
 
        /// 
        ///     DataTemplate Constructor 
        ///  
        public DataTemplate()
        { 
        }

        /// 
        ///     DataTemplate Constructor 
        /// 
        public DataTemplate(object dataType) 
        { 
            Exception ex = TemplateKey.ValidateDataType(dataType, "dataType");
            if (ex != null) 
                throw ex;

            _dataType = dataType;
        } 

        #endregion Constructors 
 
        #region Public Properties
 
        //--------------------------------------------------------------------
        //
        //  Public Properties
        // 
        //-------------------------------------------------------------------
 
        ///  
        ///     DataType for this DataTemplate.  If the template is intended
        ///     for object data, this is the Type of the data.  If the 
        ///     template is intended for XML data, this is the tag name
        ///     of the data (i.e. a string).
        /// 
        [DefaultValue(null)] 
        [Ambient]
        public object DataType 
        { 
            get {  return _dataType; }
            set 
            {
                Exception ex = TemplateKey.ValidateDataType(value, "value");
                if (ex != null)
                    throw ex; 

                CheckSealed(); 
                _dataType = value; 
            }
        } 

        /// 
        ///     Collection of Triggers
        ///  
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        [DependsOn("VisualTree")] 
        [DependsOn("Template")] 
        public TriggerCollection Triggers
        { 
            get
            {
                if (_triggers == null)
                { 
                    _triggers = new TriggerCollection();
 
                    // If the template has been sealed prior to this the newly 
                    // created TriggerCollection also needs to be sealed
                    if (IsSealed) 
                    {
                        _triggers.Seal();
                    }
                } 
                return _triggers;
            } 
        } 

        ///  
        ///     The key that will be used if the DataTemplate is added to a
        ///     ResourceDictionary in Xaml without a specified Key (x:Key).
        /// 
        public object DataTemplateKey 
        {
            get 
            { 
                return (DataType != null) ? new DataTemplateKey(DataType) : null;
            } 
        }

        #endregion PublicProperties
 
        #region Internal Properties
 
        //-------------------------------------------------------------------- 
        //
        //  Internal Properties 
        //
        //--------------------------------------------------------------------

        // 
        //  TargetType for DataTemplate. This is override is
        //  so FrameworkTemplate can see this property. 
        // 
        internal override Type TargetTypeInternal
        { 
            get {  return DefaultTargetType; }
        }

        // Subclasses must provide a way for the parser to directly set the 
        // target type.  For DataTemplate, this is not allowed.
        internal override void SetTargetTypeInternal(Type targetType) 
        { 
            throw new InvalidOperationException(SR.Get(SRID.TemplateNotTargetType));
        } 

        //
        //  DataType for DataTemplate. This is override is
        //  so FrameworkTemplate can see this property. 
        //
        internal override object DataTypeInternal 
        { 
            get {  return DataType; }
        } 

        //
        //  Collection of Triggers for a DataTemplate. This is
        //  override is so FrameworkTemplate can see this property. 
        //
        internal override TriggerCollection TriggersInternal 
        { 
            get { return Triggers; }
        } 

        // Target type of DataTrigger is ContentPresenter
        static internal Type DefaultTargetType
        { 
            get { return typeof(ContentPresenter); }
        } 
 
        #endregion Internal Properties
 
        #region Protected Methods

        //-------------------------------------------------------------------
        // 
        //  Protected Methods
        // 
        //-------------------------------------------------------------------- 

        ///  
        ///     Validate against the following rules
        ///     1. Must have a non-null feTemplatedParent
        ///     2. A DataTemplate must be applied to a ContentPresenter
        ///  
        protected override void ValidateTemplatedParent(FrameworkElement templatedParent)
        { 
            // Must have a non-null feTemplatedParent 
            if (templatedParent == null)
            { 
                throw new ArgumentNullException("templatedParent");
            }

            // A DataTemplate must be applied to a ContentPresenter 
            if (!(templatedParent is ContentPresenter))
            { 
                throw new ArgumentException(SR.Get(SRID.TemplateTargetTypeMismatch, "ContentPresenter", templatedParent.GetType().Name)); 
            }
        } 

        #endregion Protected Methods

        #region Data 

        private object                  _dataType; 
        private TriggerCollection       _triggers; 

        #endregion Data 
    }
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataTemplate.cs source code in C# .NET

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