ToggleButton.cs source code in C# .NET

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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / Primitives / ToggleButton.cs / 2 / ToggleButton.cs

                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Collections; 
using System.ComponentModel;
using System.Diagnostics; 
using System.Windows.Threading;

using System.Windows.Automation.Peers;
using System.Windows.Automation.Provider; 
using System.Windows.Controls.Primitives;
using System.Windows; 
using System.Windows.Input; 
using System.Windows.Media;
using System.Windows.Shapes; 

using MS.Internal.KnownBoxes;

// Disable CS3001: Warning as Error: not CLS-compliant 
#pragma warning disable 3001
 
namespace System.Windows.Controls.Primitives 
{
    ///  
    ///     ToggleButton
    /// 
    [DefaultEvent("Checked")]
    public class ToggleButton: ButtonBase 
    {
 
        #region Constructors 

        static ToggleButton() 
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ToggleButton), new FrameworkPropertyMetadata(typeof(ToggleButton)));
            _dType = DependencyObjectType.FromSystemTypeInternal(typeof(ToggleButton));
        } 

        ///  
        ///     Default ToggleButton constructor 
        /// 
        ///  
        ///     Automatic determination of current Dispatcher. Use alternative constructor
        ///     that accepts a Dispatcher for best performance.
        /// 
        public ToggleButton() : base() 
        {
        } 
        #endregion 

        #region Properties and Events 

        /// 
        ///     Checked event
        ///  
        public static readonly RoutedEvent CheckedEvent = EventManager.RegisterRoutedEvent("Checked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ToggleButton));
 
        ///  
        ///     Unchecked event
        ///  
        public static readonly RoutedEvent UncheckedEvent = EventManager.RegisterRoutedEvent("Unchecked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ToggleButton));

        /// 
        ///     Indeterminate event 
        /// 
        public static readonly RoutedEvent IndeterminateEvent = EventManager.RegisterRoutedEvent("Indeterminate", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ToggleButton)); 
 
        /// 
        ///     Add / Remove Checked handler 
        /// 
        [Category("Behavior")]
        public event RoutedEventHandler Checked
        { 
            add
            { 
                AddHandler(CheckedEvent, value); 
            }
 
            remove
            {
                RemoveHandler(CheckedEvent, value);
            } 
        }
 
        ///  
        ///     Add / Remove Unchecked handler
        ///  
        [Category("Behavior")]
        public event RoutedEventHandler Unchecked
        {
            add 
            {
                AddHandler(UncheckedEvent, value); 
            } 

            remove 
            {
                RemoveHandler(UncheckedEvent, value);
            }
        } 

        ///  
        ///     Add / Remove Indeterminate handler 
        /// 
        [Category("Behavior")] 
        public event RoutedEventHandler Indeterminate
        {
            add
            { 
                AddHandler(IndeterminateEvent, value);
            } 
 
            remove
            { 
                RemoveHandler(IndeterminateEvent, value);
            }
        }
 
        /// 
        ///     The DependencyProperty for the IsChecked property. 
        ///     Flags:              BindsTwoWayByDefault 
        ///     Default Value:      false
        ///  
        public static readonly DependencyProperty IsCheckedProperty =
                DependencyProperty.Register(
                        "IsChecked",
                        typeof(bool?), 
                        typeof(ToggleButton),
                        new FrameworkPropertyMetadata( 
                                BooleanBoxes.FalseBox, 
                                FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Journal,
                                new PropertyChangedCallback(OnIsCheckedChanged))); 

        /// 
        ///     Indicates whether the ToggleButton is checked
        ///  
        [Category("Appearance")]
        [TypeConverter(typeof(NullableBoolConverter))] 
        [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] 
        public bool? IsChecked
        { 
            get
            {
                // Because Nullable unboxing is very slow (uses reflection) first we cast to bool
                object value = GetValue(IsCheckedProperty); 
                if (value == null)
                    return new Nullable(); 
                else 
                    return new Nullable((bool)value);
            } 
            set
            {
                SetValue(IsCheckedProperty, value.HasValue ? BooleanBoxes.Box(value.Value) : null);
            } 
        }
 
        private static object OnGetIsChecked(DependencyObject d) {return ((ToggleButton)d).IsChecked;} 

        ///  
        ///     Called when IsChecked is changed on "d."
        /// 
        /// The object on which the property was changed.
        /// EventArgs that contains the old and new values for this property 
        private static void OnIsCheckedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            ToggleButton button = (ToggleButton)d; 
            bool? oldValue = (bool?) e.OldValue;
            bool? newValue = (bool?) e.NewValue; 

            //doing soft casting here because the peer can be that of RadioButton and it is not derived from
            //ToggleButtonAutomationPeer - specifically to avoid implementing TogglePattern
            ToggleButtonAutomationPeer peer = UIElementAutomationPeer.FromElement(button) as ToggleButtonAutomationPeer; 
            if (peer != null)
            { 
                peer.RaiseToggleStatePropertyChangedEvent(oldValue, newValue); 
            }
 
            if (newValue == true)
            {
                button.OnChecked(new RoutedEventArgs(CheckedEvent));
            } 
            else if (newValue == false)
            { 
                button.OnUnchecked(new RoutedEventArgs(UncheckedEvent)); 
            }
            else 
            {
                button.OnIndeterminate(new RoutedEventArgs(IndeterminateEvent));
            }
        } 

        ///  
        ///     Called when IsChecked becomes true. 
        /// 
        /// Event arguments for the routed event that is raised by the default implementation of this method. 
        protected virtual void OnChecked(RoutedEventArgs e)
        {
            RaiseEvent(e);
        } 

        ///  
        ///     Called when IsChecked becomes false. 
        /// 
        /// Event arguments for the routed event that is raised by the default implementation of this method. 
        protected virtual void OnUnchecked(RoutedEventArgs e)
        {
            RaiseEvent(e);
        } 

        ///  
        ///     Called when IsChecked becomes null. 
        /// 
        /// Event arguments for the routed event that is raised by the default implementation of this method. 
        protected virtual void OnIndeterminate(RoutedEventArgs e)
        {
            RaiseEvent(e);
        } 

        ///  
        ///     The DependencyProperty for the IsThreeState property. 
        ///     Flags:              None
        ///     Default Value:      false 
        /// 
        public static readonly DependencyProperty IsThreeStateProperty =
                DependencyProperty.Register(
                        "IsThreeState", 
                        typeof(bool),
                        typeof(ToggleButton), 
                        new FrameworkPropertyMetadata(BooleanBoxes.FalseBox)); 

        ///  
        ///     The IsThreeState property determines whether the control supports two or three states.
        ///     IsChecked property can be set to null as a third state when IsThreeState is true
        /// 
        [Bindable(true), Category("Behavior")] 
        public bool IsThreeState
        { 
            get { return (bool) GetValue(IsThreeStateProperty); } 
            set { SetValue(IsThreeStateProperty, BooleanBoxes.Box(value)); }
        } 

        #endregion

        #region Override methods 

        ///  
        /// Creates AutomationPeer () 
        /// 
        protected override AutomationPeer OnCreateAutomationPeer() 
        {
            return new ToggleButtonAutomationPeer(this);
        }
 
        /// 
        /// This override method is called when the control is clicked by mouse or keyboard 
        ///  
        protected override void OnClick()
        { 
            OnToggle();
            base.OnClick();
        }
 
        #endregion
 
        #region Method Overrides 

        ///  
        ///     Gives a string representation of this object.
        /// 
        public override string ToString()
        { 
            string typeText = this.GetType().ToString();
            string contentText = String.Empty; 
            bool? isChecked = false; 
            bool valuesDefined = false;
 
            // Accessing ToggleButton properties may be thread sensitive
            if (CheckAccess())
            {
                contentText = GetPlainText(); 
                isChecked = IsChecked;
                valuesDefined = true; 
            } 
            else
            { 
                //Not on dispatcher, try posting to the dispatcher with 20ms timeout
                Dispatcher.Invoke(DispatcherPriority.Send, new TimeSpan(0, 0, 0, 0, 20), new DispatcherOperationCallback(delegate(object o)
                {
                    contentText = GetPlainText(); 
                    isChecked = IsChecked;
                    valuesDefined = true; 
                    return null; 
                }), null);
            } 

            // If Content and isChecked are defined
            if (valuesDefined)
            { 
                return SR.Get(SRID.ToStringFormatString_ToggleButton, typeText, contentText, isChecked.HasValue ? isChecked.Value.ToString() : "null");
            } 
 
            // Not able to access the dispatcher
            return typeText; 
        }

        #endregion
 
        #region Protected virtual methods
 
        ///  
        /// This vitrual method is called from OnClick(). ToggleButton toggles IsChecked property.
        /// Subclasses can override this method to implement their own toggle behavior 
        /// 
        protected internal virtual void OnToggle()
        {
            // If IsChecked == true && IsThreeState == true   --->  IsChecked = null 
            // If IsChecked == true && IsThreeState == false  --->  IsChecked = false
            // If IsChecked == false                          --->  IsChecked = true 
            // If IsChecked == null                           --->  IsChecked = false 
            if (IsChecked == true)
                IsChecked = IsThreeState ? (bool?)null : (bool?)false; 
            else // false or null
                IsChecked = IsChecked.HasValue; // HasValue returns true if IsChecked==false
        }
 
        #endregion
 
        #region Data 

        #endregion 

        #region Accessibility

        #endregion 

        #region DTypeThemeStyleKey 
 
        // Returns the DependencyObjectType for the registered ThemeStyleKey's default
        // value. Controls will override this method to return approriate types. 
        internal override DependencyObjectType DTypeThemeStyleKey
        {
            get { return _dType; }
        } 

        private static DependencyObjectType _dType; 
 
        #endregion DTypeThemeStyleKey
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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