GroupStyle.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / GroupStyle.cs / 1305600 / GroupStyle.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) 2003 by Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Description of UI for grouping. 
//
// See spec at http://avalon/connecteddata/Specs/Grouping.mht 
//
//---------------------------------------------------------------------------

using System.ComponentModel;    // [DefaultValue] 
using System.Windows.Data;      // CollectionViewGroup
 
namespace System.Windows.Controls 
{
    ///  
    /// The GroupStyle describes how to display the items in a GroupCollection,
    /// such as the collection obtained from CollectionViewGroup.Items.
    /// 
    [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] // cannot be read & localized as string 
    public class GroupStyle : INotifyPropertyChanged
    { 
        #region Constructors 

        //----------------------------------------------------- 
        //
        //  Constructors
        //
        //----------------------------------------------------- 

        ///  
        /// Initializes a new instance of GroupStyle. 
        /// 
        public GroupStyle() 
        {
            _panel = DefaultGroupPanel;
        }
 
        static GroupStyle()
        { 
            ItemsPanelTemplate template = new ItemsPanelTemplate(new FrameworkElementFactory(typeof(StackPanel))); 
            template.Seal();
            DefaultGroupPanel = template; 

            s_DefaultGroupStyle = new GroupStyle();
        }
 
        #endregion Constructors
 
        #region INotifyPropertyChanged 

        ///  
        ///     This event is raised when a property of the group style has changed.
        /// 
        event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged
        { 
            add
            { 
                PropertyChanged += value; 
            }
            remove 
            {
                PropertyChanged -= value;
            }
        } 

        ///  
        /// PropertyChanged event (per ). 
        /// 
        protected virtual event PropertyChangedEventHandler PropertyChanged; 

        /// 
        /// A subclass can call this method to raise the PropertyChanged event.
        ///  
        protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
        { 
            if (PropertyChanged != null) 
            {
                PropertyChanged(this, e); 
            }
        }

        #endregion INotifyPropertyChanged 

        #region Public Properties 
 
        //------------------------------------------------------
        // 
        //  Public Properties
        //
        //-----------------------------------------------------
 
        /// 
        /// A template that creates the panel used to layout the items. 
        ///  
        public ItemsPanelTemplate Panel
        { 
            get { return _panel; }
            set
            {
                _panel = value; 
                OnPropertyChanged("Panel");
            } 
        } 

        ///  
        ///     ContainerStyle is the style that is applied to the GroupItem generated
        ///     for each item.
        /// 
        [DefaultValue(null)] 
        public Style ContainerStyle
        { 
            get { return _containerStyle; } 
            set { _containerStyle = value;  OnPropertyChanged("ContainerStyle"); }
        } 

        /// 
        ///     ContainerStyleSelector allows the app writer to provide custom style selection logic
        ///     for a style to apply to each generated GroupItem. 
        /// 
        [DefaultValue(null)] 
        public StyleSelector ContainerStyleSelector 
        {
            get { return _containerStyleSelector; } 
            set { _containerStyleSelector = value;  OnPropertyChanged("ContainerStyleSelector"); }
        }

        ///  
        ///     HeaderTemplate is the template used to display the group header.
        ///  
        [DefaultValue(null)] 
        public DataTemplate HeaderTemplate
        { 
            get { return _headerTemplate; }
            set { _headerTemplate = value;  OnPropertyChanged("HeaderTemplate"); }
        }
 
        /// 
        ///     HeaderTemplateSelector allows the app writer to provide custom selection logic 
        ///     for a template used to display the group header. 
        /// 
        [DefaultValue(null)] 
        public DataTemplateSelector HeaderTemplateSelector
        {
            get { return _headerTemplateSelector; }
            set { _headerTemplateSelector = value;  OnPropertyChanged("HeaderTemplateSelector"); } 
        }
 
        ///  
        ///     HeaderStringFormat is the format used to display the header content as a string.
        ///     This arises only when no template is available. 
        /// 
        [DefaultValue(null)]
        public String HeaderStringFormat
        { 
            get { return _headerStringFormat; }
            set { _headerStringFormat = value;  OnPropertyChanged("HeaderStringFormat"); } 
        } 

        ///  
        /// HidesIfEmpty allows the app writer to indicate whether items corresponding
        /// to empty groups should be displayed.
        /// 
        [DefaultValue(false)] 
        public bool HidesIfEmpty
        { 
            get { return _hidesIfEmpty; } 
            set { _hidesIfEmpty = value;  OnPropertyChanged("HidesIfEmpty"); }
        } 

        /// 
        /// AlternationCount controls the range of values assigned to the
        /// ItemsControl.AlternationIndex property on containers generated 
        /// for this level of grouping.
        [DefaultValue(0)] 
        public int AlternationCount 
        {
            get { return _alternationCount; } 
            set
            {
                _alternationCount = value;
                _isAlternationCountSet = true; 
                OnPropertyChanged("AlternationCount");
            } 
        } 

        /// The default panel template. 
        public static readonly ItemsPanelTemplate DefaultGroupPanel;

        /// The default GroupStyle.
        public static GroupStyle Default 
        {
            get { return s_DefaultGroupStyle; } 
        } 

        #endregion Public Properties 

        #region Private Properties
        private void OnPropertyChanged(string propertyName)
        { 
            OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
        } 
 
        internal bool IsAlternationCountSet
        { 
            get { return _isAlternationCountSet; }
        }

        #endregion Private Properties 

        #region Private Fields 
 
        //------------------------------------------------------
        // 
        //  Private Fields
        //
        //------------------------------------------------------
 
        ItemsPanelTemplate      _panel;
        Style                   _containerStyle; 
        StyleSelector           _containerStyleSelector; 
        DataTemplate            _headerTemplate;
        DataTemplateSelector    _headerTemplateSelector; 
        string                  _headerStringFormat;
        bool                    _hidesIfEmpty;
        bool                    _isAlternationCountSet;
        int                     _alternationCount; 

        static GroupStyle       s_DefaultGroupStyle; 
 
        #endregion Private Fields
    } 

    /// 
    /// A delegate to select the group style as a function of the
    /// parent group and its level. 
    /// 
    public delegate GroupStyle GroupStyleSelector(CollectionViewGroup group, int level); 
} 

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

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