Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / Primitives / ToggleButton.cs / 1458001 / 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 Nullableunboxing 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)); } button.UpdateVisualState(); } ////// 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 internal override void ChangeVisualState(bool useTransitions) { base.ChangeVisualState(useTransitions); // Update the Check state group var isChecked = IsChecked; if (isChecked == true) { VisualStateManager.GoToState(this, VisualStates.StateChecked, useTransitions); } else if (isChecked == false) { VisualStateManager.GoToState(this, VisualStates.StateUnchecked, useTransitions); } else { // isChecked is null VisualStates.GoToState(this, useTransitions, VisualStates.StateIndeterminate, VisualStates.StateUnchecked); } } ////// 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 bool? isChecked; if (IsChecked == true) isChecked = IsThreeState ? (bool?)null : (bool?)false; else // false or null isChecked = IsChecked.HasValue; // HasValue returns true if IsChecked==false SetCurrentValueInternal(IsCheckedProperty, isChecked); } #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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