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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / Label.cs / 1 / Label.cs
/****************************************************************************\ * * File: Label.cs * * Description: * Implements label control. * * Copyright (C) 2003-2006 by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using System; using System.Windows.Threading; using System.Windows; using System.Windows.Input; using System.Windows.Markup; namespace System.Windows.Controls { ////// The Label control provides two basic pieces of functionality. It provides the /// ability to label a control -- called the "target" herein -- thus providing information /// to the application user about the target. The labeling is done through both /// the actual text of the Label control and through information surfaced through /// the UIAutomation API. The second function of the Label control is to provide /// mnemonics support -- both functional and visual -- the target. For example, the /// TextBox has no way of displaying additional information outside of its content. /// A Label control could help solve this problem. Note, the Label control is /// frequently used in dialogs to allow quick keyboard access to controls in the dialog. /// ///[Localizability(LocalizationCategory.Label)] public class Label : ContentControl { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors /// /// Static constructor /// static Label() { EventManager.RegisterClassHandler(typeof(Label), AccessKeyManager.AccessKeyPressedEvent, new AccessKeyPressedEventHandler(OnAccessKeyPressed)); DefaultStyleKeyProperty.OverrideMetadata(typeof(Label), new FrameworkPropertyMetadata(typeof(Label))); _dType = DependencyObjectType.FromSystemTypeInternal(typeof(Label)); // prevent label from being a tab stop and focusable IsTabStopProperty.OverrideMetadata(typeof(Label), new FrameworkPropertyMetadata(MS.Internal.KnownBoxes.BooleanBoxes.FalseBox)); FocusableProperty.OverrideMetadata(typeof(Label), new FrameworkPropertyMetadata(MS.Internal.KnownBoxes.BooleanBoxes.FalseBox)); } ////// Default Label constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public Label() : base() { } #endregion //----------------------------------------------------- // // Public Properties // //------------------------------------------------------ #region Public Properties ////// DependencyProperty for Target property. /// public static readonly DependencyProperty TargetProperty = DependencyProperty.Register( "Target", typeof(UIElement), typeof(Label), new FrameworkPropertyMetadata( (UIElement) null, new PropertyChangedCallback(OnTargetChanged))); ////// The target of this label. /// public UIElement Target { get { return (UIElement) GetValue(TargetProperty); } set { SetValue(TargetProperty, value); } } private static void OnTargetChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { Label label = (Label) d; UIElement oldElement = (UIElement) e.OldValue; UIElement newElement = (UIElement) e.NewValue; // If the Target property has changed, set the LabeledByProperty on // the new Target and clear the LabeledByProperty on the old Target. if (oldElement != null) { object oldValueLabeledBy = oldElement.GetValue(LabeledByProperty); // If this Label was actually labelling the oldValue // then clear the LabeledByProperty if (oldValueLabeledBy == label) { oldElement.ClearValue(LabeledByProperty); } } if (newElement != null) { newElement.SetValue(LabeledByProperty, label); } } ////// Attached DependencyProperty which indicates the element that is labeling /// another element. /// private static readonly DependencyProperty LabeledByProperty = DependencyProperty.RegisterAttached( "LabeledBy", typeof(Label), typeof(Label), new FrameworkPropertyMetadata((Label)null)); ////// Returns the Label that an element might have been labeled by. /// /// The element that might have been labeled. ///The Label that labels the element. Null otherwise. ////// This internal method is used by UIAutomation's FrameworkElementProxy. /// internal static Label GetLabeledBy(DependencyObject o) { if (o == null) { throw new ArgumentNullException("o"); } return (Label)o.GetValue(LabeledByProperty); } #endregion //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ ////// Creates AutomationPeer ( protected override System.Windows.Automation.Peers.AutomationPeer OnCreateAutomationPeer() { return new System.Windows.Automation.Peers.LabelAutomationPeer(this); } #region Private Methods private static void OnAccessKeyPressed(object sender, AccessKeyPressedEventArgs e) { Label label = sender as Label; // if (!e.Handled && e.Scope == null && (e.Target == null || e.Target == label)) { e.Target = label.Target; } } #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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