Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / RadioButton.cs / 1458001 / RadioButton.cs
using System; using System.Collections; using System.ComponentModel; using System.Threading; using System.Windows.Threading; using System.Windows.Automation; using System.Windows.Controls.Primitives; using System.Windows.Data; using System.Windows; using System.Windows.Input; using System.Windows.Media; using MS.Utility; // Disable CS3001: Warning as Error: not CLS-compliant #pragma warning disable 3001 namespace System.Windows.Controls { ////// RadioButton implements option button with two states: true or false /// [Localizability(LocalizationCategory.RadioButton)] public class RadioButton : ToggleButton { #region Constructors static RadioButton() { DefaultStyleKeyProperty.OverrideMetadata(typeof(RadioButton), new FrameworkPropertyMetadata(typeof(RadioButton))); _dType = DependencyObjectType.FromSystemTypeInternal(typeof(RadioButton)); KeyboardNavigation.AcceptsReturnProperty.OverrideMetadata(typeof(RadioButton), new FrameworkPropertyMetadata(MS.Internal.KnownBoxes.BooleanBoxes.FalseBox)); } ////// Default RadioButton constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public RadioButton() : base() { } #endregion #region private helpers private static void OnGroupNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { RadioButton radioButton = (RadioButton)d; string groupName = e.NewValue as string; string currentlyRegisteredGroupName = _currentlyRegisteredGroupName.GetValue(radioButton); if (groupName != currentlyRegisteredGroupName) { // Unregister the old group name if set if (!string.IsNullOrEmpty(currentlyRegisteredGroupName)) Unregister(currentlyRegisteredGroupName, radioButton); // Register the new group name is set if (!string.IsNullOrEmpty(groupName)) Register(groupName, radioButton); } } private static void Register(string groupName, RadioButton radioButton) { if (_groupNameToElements == null) _groupNameToElements = new Hashtable(1); lock (_groupNameToElements) { ArrayList elements = (ArrayList)_groupNameToElements[groupName]; if (elements == null) { elements = new ArrayList(1); _groupNameToElements[groupName] = elements; } else { // There were some elements there, remove dead ones PurgeDead(elements, null); } elements.Add(new WeakReference(radioButton)); } _currentlyRegisteredGroupName.SetValue(radioButton, groupName); } private static void Unregister(string groupName, RadioButton radioButton) { if (_groupNameToElements == null) return; lock (_groupNameToElements) { // Get all elements bound to this key and remove this element ArrayList elements = (ArrayList)_groupNameToElements[groupName]; if (elements != null) { PurgeDead(elements, radioButton); if (elements.Count == 0) { _groupNameToElements.Remove(groupName); } } } _currentlyRegisteredGroupName.SetValue(radioButton, null); } private static void PurgeDead(ArrayList elements, object elementToRemove) { for (int i = 0; i < elements.Count; ) { WeakReference weakReference = (WeakReference)elements[i]; object element = weakReference.Target; if (element == null || element == elementToRemove) { elements.RemoveAt(i); } else { i++; } } } private void UpdateRadioButtonGroup() { string groupName = GroupName; if (!string.IsNullOrEmpty(groupName)) { Visual rootScope = KeyboardNavigation.GetVisualRoot(this); if (_groupNameToElements == null) _groupNameToElements = new Hashtable(1); lock (_groupNameToElements) { // Get all elements bound to this key and remove this element ArrayList elements = (ArrayList)_groupNameToElements[groupName]; for (int i = 0; i < elements.Count; ) { WeakReference weakReference = (WeakReference)elements[i]; RadioButton rb = weakReference.Target as RadioButton; if (rb == null) { // Remove dead instances elements.RemoveAt(i); } else { // Uncheck all checked RadioButtons different from the current one if (rb != this && (rb.IsChecked == true) && rootScope == KeyboardNavigation.GetVisualRoot(rb)) rb.UncheckRadioButton(); i++; } } } } else // Logical parent should be the group { DependencyObject parent = this.Parent; if (parent != null) { // Traverse logical children IEnumerable children = LogicalTreeHelper.GetChildren(parent); IEnumerator itor = children.GetEnumerator(); while (itor.MoveNext()) { RadioButton rb = itor.Current as RadioButton; if (rb != null && rb != this && string.IsNullOrEmpty(rb.GroupName) && (rb.IsChecked == true)) rb.UncheckRadioButton(); } } } } private void UncheckRadioButton() { SetCurrentValueInternal(IsCheckedProperty, MS.Internal.KnownBoxes.BooleanBoxes.FalseBox); } #endregion #region Properties and Events ////// The DependencyID for the GroupName property. /// Default Value: "String.Empty" /// public static readonly DependencyProperty GroupNameProperty = DependencyProperty.Register( "GroupName", typeof(string), typeof(RadioButton), new FrameworkPropertyMetadata(String.Empty, new PropertyChangedCallback(OnGroupNameChanged))); ////// GroupName determine mutually excusive radiobutton groups /// [DefaultValue("")] [Localizability(LocalizationCategory.NeverLocalize)] // cannot be localized public string GroupName { get { return (string)GetValue(GroupNameProperty); } set { SetValue(GroupNameProperty, value); } } #endregion #region Override methods ////// Creates AutomationPeer ( protected override System.Windows.Automation.Peers.AutomationPeer OnCreateAutomationPeer() { return new System.Windows.Automation.Peers.RadioButtonAutomationPeer(this); } ///) /// /// This method is invoked when the IsChecked becomes true. /// /// RoutedEventArgs. protected override void OnChecked(RoutedEventArgs e) { // If RadioButton is checked we should uncheck the others in the same group UpdateRadioButtonGroup(); base.OnChecked(e); } ////// This override method is called from OnClick(). /// RadioButton implements its own toggle behavior /// protected internal override void OnToggle() { SetCurrentValueInternal(IsCheckedProperty, MS.Internal.KnownBoxes.BooleanBoxes.TrueBox); } ////// The Access key for this control was invoked. /// /// protected override void OnAccessKey(AccessKeyEventArgs e) { if (!IsKeyboardFocused) { Focus(); } base.OnAccessKey(e); } #endregion #region Accessibility #endregion Accessibility #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 #region private data [ThreadStatic] private static Hashtable _groupNameToElements; private static readonly UncommonField_currentlyRegisteredGroupName = new UncommonField (); #endregion private data } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Collections; using System.ComponentModel; using System.Threading; using System.Windows.Threading; using System.Windows.Automation; using System.Windows.Controls.Primitives; using System.Windows.Data; using System.Windows; using System.Windows.Input; using System.Windows.Media; using MS.Utility; // Disable CS3001: Warning as Error: not CLS-compliant #pragma warning disable 3001 namespace System.Windows.Controls { /// /// RadioButton implements option button with two states: true or false /// [Localizability(LocalizationCategory.RadioButton)] public class RadioButton : ToggleButton { #region Constructors static RadioButton() { DefaultStyleKeyProperty.OverrideMetadata(typeof(RadioButton), new FrameworkPropertyMetadata(typeof(RadioButton))); _dType = DependencyObjectType.FromSystemTypeInternal(typeof(RadioButton)); KeyboardNavigation.AcceptsReturnProperty.OverrideMetadata(typeof(RadioButton), new FrameworkPropertyMetadata(MS.Internal.KnownBoxes.BooleanBoxes.FalseBox)); } ////// Default RadioButton constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public RadioButton() : base() { } #endregion #region private helpers private static void OnGroupNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { RadioButton radioButton = (RadioButton)d; string groupName = e.NewValue as string; string currentlyRegisteredGroupName = _currentlyRegisteredGroupName.GetValue(radioButton); if (groupName != currentlyRegisteredGroupName) { // Unregister the old group name if set if (!string.IsNullOrEmpty(currentlyRegisteredGroupName)) Unregister(currentlyRegisteredGroupName, radioButton); // Register the new group name is set if (!string.IsNullOrEmpty(groupName)) Register(groupName, radioButton); } } private static void Register(string groupName, RadioButton radioButton) { if (_groupNameToElements == null) _groupNameToElements = new Hashtable(1); lock (_groupNameToElements) { ArrayList elements = (ArrayList)_groupNameToElements[groupName]; if (elements == null) { elements = new ArrayList(1); _groupNameToElements[groupName] = elements; } else { // There were some elements there, remove dead ones PurgeDead(elements, null); } elements.Add(new WeakReference(radioButton)); } _currentlyRegisteredGroupName.SetValue(radioButton, groupName); } private static void Unregister(string groupName, RadioButton radioButton) { if (_groupNameToElements == null) return; lock (_groupNameToElements) { // Get all elements bound to this key and remove this element ArrayList elements = (ArrayList)_groupNameToElements[groupName]; if (elements != null) { PurgeDead(elements, radioButton); if (elements.Count == 0) { _groupNameToElements.Remove(groupName); } } } _currentlyRegisteredGroupName.SetValue(radioButton, null); } private static void PurgeDead(ArrayList elements, object elementToRemove) { for (int i = 0; i < elements.Count; ) { WeakReference weakReference = (WeakReference)elements[i]; object element = weakReference.Target; if (element == null || element == elementToRemove) { elements.RemoveAt(i); } else { i++; } } } private void UpdateRadioButtonGroup() { string groupName = GroupName; if (!string.IsNullOrEmpty(groupName)) { Visual rootScope = KeyboardNavigation.GetVisualRoot(this); if (_groupNameToElements == null) _groupNameToElements = new Hashtable(1); lock (_groupNameToElements) { // Get all elements bound to this key and remove this element ArrayList elements = (ArrayList)_groupNameToElements[groupName]; for (int i = 0; i < elements.Count; ) { WeakReference weakReference = (WeakReference)elements[i]; RadioButton rb = weakReference.Target as RadioButton; if (rb == null) { // Remove dead instances elements.RemoveAt(i); } else { // Uncheck all checked RadioButtons different from the current one if (rb != this && (rb.IsChecked == true) && rootScope == KeyboardNavigation.GetVisualRoot(rb)) rb.UncheckRadioButton(); i++; } } } } else // Logical parent should be the group { DependencyObject parent = this.Parent; if (parent != null) { // Traverse logical children IEnumerable children = LogicalTreeHelper.GetChildren(parent); IEnumerator itor = children.GetEnumerator(); while (itor.MoveNext()) { RadioButton rb = itor.Current as RadioButton; if (rb != null && rb != this && string.IsNullOrEmpty(rb.GroupName) && (rb.IsChecked == true)) rb.UncheckRadioButton(); } } } } private void UncheckRadioButton() { SetCurrentValueInternal(IsCheckedProperty, MS.Internal.KnownBoxes.BooleanBoxes.FalseBox); } #endregion #region Properties and Events ////// The DependencyID for the GroupName property. /// Default Value: "String.Empty" /// public static readonly DependencyProperty GroupNameProperty = DependencyProperty.Register( "GroupName", typeof(string), typeof(RadioButton), new FrameworkPropertyMetadata(String.Empty, new PropertyChangedCallback(OnGroupNameChanged))); ////// GroupName determine mutually excusive radiobutton groups /// [DefaultValue("")] [Localizability(LocalizationCategory.NeverLocalize)] // cannot be localized public string GroupName { get { return (string)GetValue(GroupNameProperty); } set { SetValue(GroupNameProperty, value); } } #endregion #region Override methods ////// Creates AutomationPeer ( protected override System.Windows.Automation.Peers.AutomationPeer OnCreateAutomationPeer() { return new System.Windows.Automation.Peers.RadioButtonAutomationPeer(this); } ///) /// /// This method is invoked when the IsChecked becomes true. /// /// RoutedEventArgs. protected override void OnChecked(RoutedEventArgs e) { // If RadioButton is checked we should uncheck the others in the same group UpdateRadioButtonGroup(); base.OnChecked(e); } ////// This override method is called from OnClick(). /// RadioButton implements its own toggle behavior /// protected internal override void OnToggle() { SetCurrentValueInternal(IsCheckedProperty, MS.Internal.KnownBoxes.BooleanBoxes.TrueBox); } ////// The Access key for this control was invoked. /// /// protected override void OnAccessKey(AccessKeyEventArgs e) { if (!IsKeyboardFocused) { Focus(); } base.OnAccessKey(e); } #endregion #region Accessibility #endregion Accessibility #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 #region private data [ThreadStatic] private static Hashtable _groupNameToElements; private static readonly UncommonField_currentlyRegisteredGroupName = new UncommonField (); #endregion private data } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XPathScanner.cs
- CompositeFontFamily.cs
- CapiNative.cs
- ExpandCollapsePattern.cs
- dsa.cs
- PtsPage.cs
- ColumnHeaderConverter.cs
- DataGridViewEditingControlShowingEventArgs.cs
- BrowserCapabilitiesFactoryBase.cs
- List.cs
- OperationCanceledException.cs
- RecordManager.cs
- SqlProcedureAttribute.cs
- BasicBrowserDialog.cs
- ReservationCollection.cs
- _ContextAwareResult.cs
- ItemContainerGenerator.cs
- MultiPageTextView.cs
- ChannelRequirements.cs
- CollectionDataContractAttribute.cs
- PanelDesigner.cs
- HttpModuleActionCollection.cs
- Geometry.cs
- ThreadNeutralSemaphore.cs
- ParameterToken.cs
- ToolStripProgressBar.cs
- Relationship.cs
- manifestimages.cs
- TraceContextRecord.cs
- DeviceContext2.cs
- DataExchangeServiceBinder.cs
- SettingsPropertyIsReadOnlyException.cs
- Matrix3DConverter.cs
- SizeAnimationUsingKeyFrames.cs
- GetParentChain.cs
- VectorConverter.cs
- TransformerInfo.cs
- WpfWebRequestHelper.cs
- MyContact.cs
- BrowserCapabilitiesFactory35.cs
- ProfileGroupSettingsCollection.cs
- diagnosticsswitches.cs
- SqlResolver.cs
- EventMappingSettingsCollection.cs
- DeleteHelper.cs
- TemplateParser.cs
- HelpProvider.cs
- Baml6Assembly.cs
- _NTAuthentication.cs
- ResolvedKeyFrameEntry.cs
- XPathQilFactory.cs
- RewritingPass.cs
- XmlDeclaration.cs
- MetafileHeader.cs
- XmlSchemaGroupRef.cs
- StringUtil.cs
- XmlElement.cs
- SchemaImporter.cs
- TextTreeInsertUndoUnit.cs
- CommandHelper.cs
- XmlCountingReader.cs
- DbException.cs
- ListView.cs
- EdmProviderManifest.cs
- WebPartMenuStyle.cs
- LazyTextWriterCreator.cs
- HtmlForm.cs
- ObjectNotFoundException.cs
- PasswordRecovery.cs
- RemoteWebConfigurationHostStream.cs
- TemplateKey.cs
- SafeNativeMethods.cs
- EvidenceBase.cs
- PartialCachingControl.cs
- ProviderSettingsCollection.cs
- Stroke2.cs
- RowToFieldTransformer.cs
- FeatureSupport.cs
- ReadOnlyHierarchicalDataSourceView.cs
- XmlException.cs
- XDRSchema.cs
- ToolStripLocationCancelEventArgs.cs
- ValidationRule.cs
- TCPClient.cs
- LockedBorderGlyph.cs
- BaseCollection.cs
- PeerNameResolver.cs
- CfgParser.cs
- StrongNamePublicKeyBlob.cs
- DataGridItemEventArgs.cs
- DbSetClause.cs
- SqlNodeAnnotation.cs
- DocumentSchemaValidator.cs
- FixedLineResult.cs
- NativeRecognizer.cs
- AsyncResult.cs
- ConfigUtil.cs
- XmlObjectSerializerReadContextComplexJson.cs
- CompoundFileDeflateTransform.cs
- TypeDescriptionProvider.cs