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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / Decorator.cs / 1 / Decorator.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: Border.cs // // Description: Contains the Decorator class. // Spec at [....]/layout/Specs/Decorator.xml // // History: // 06/12/2003 : [....] - Added to WCP branch // //--------------------------------------------------------------------------- using MS.Internal; using MS.Internal.Controls; using MS.Utility; using System; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Windows.Threading; using System.Windows.Media; using System.Windows.Markup; // IAddChild, ContentPropertyAttribute namespace System.Windows.Controls { ////// Decorator is a base class for elements that apply effects onto or around a single child. /// [Localizability(LocalizationCategory.Ignore, Readability = Readability.Unreadable)] [ContentProperty("Child")] public class Decorator : FrameworkElement, IAddChild { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ////// Default DependencyObject constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public Decorator() : base() { } #endregion //-------------------------------------------------------------------- // // Public Methods // //------------------------------------------------------------------- #region Public Methods ////// This method is called to Add the object as a child of the Decorator. This method is used primarily /// by the parser; a more direct way of adding a child to a Decorator is to use the /// /// The object to add as a child; it must be a UIElement. /// void IAddChild.AddChild (Object value) { if (!(value is UIElement)) { throw new ArgumentException (SR.Get(SRID.UnexpectedParameterType, value.GetType(), typeof(UIElement)), "value"); } if (this.Child != null) { throw new ArgumentException(SR.Get(SRID.CanOnlyHaveOneChild, this.GetType(), value.GetType())); } this.Child = (UIElement)value; } ////// property. /// /// This method is called by the parser when text appears under the tag in markup. /// As Decorators do not support text, calling this method has no effect if the text /// is all whitespace. For non-whitespace text, throw an exception. /// /// /// Text to add as a child. /// void IAddChild.AddText (string text) { XamlSerializerUtil.ThrowIfNonWhiteSpaceInAddText(text, this); } #endregion //-------------------------------------------------------------------- // // Public Properties // //-------------------------------------------------------------------- #region Public Properties ////// The single child of a [DefaultValue(null)] public virtual UIElement Child { get { return _child; } set { if(_child != value) { // notify the visual layer that the old child has been removed. RemoveVisualChild(_child); //need to remove old element from logical tree RemoveLogicalChild(_child); _child = value; AddLogicalChild(value); // notify the visual layer about the new child. AddVisualChild(value); InvalidateMeasure(); } } } ////// /// Returns enumerator to logical children. /// protected internal override IEnumerator LogicalChildren { get { if (_child == null) { return EmptyEnumerator.Instance; } return new SingleChildEnumerator(_child); } } #endregion //------------------------------------------------------------------- // // Protected Methods // //-------------------------------------------------------------------- #region Protected Methods ////// Returns the Visual children count. /// protected override int VisualChildrenCount { get { return (_child == null) ? 0 : 1; } } ////// Returns the child at the specified index. /// protected override Visual GetVisualChild(int index) { if ( (_child == null) || (index != 0)) { throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange)); } return _child; } ////// Updates DesiredSize of the Decorator. Called by parent UIElement. This is the first pass of layout. /// ////// Decorator determines a desired size it needs from the child's sizing properties, margin, and requested size. /// /// Constraint size is an "upper limit" that the return value should not exceed. ///The Decorator's desired size. protected override Size MeasureOverride(Size constraint) { UIElement child = Child; if (child != null) { child.Measure(constraint); return (child.DesiredSize); } return (new Size()); } ////// Decorator computes the position of its single child inside child's Margin and calls Arrange /// on the child. /// /// Size the Decorator will assume. protected override Size ArrangeOverride(Size arrangeSize) { UIElement child = Child; if (child != null) { child.Arrange(new Rect(arrangeSize)); } return (arrangeSize); } #endregion #region Internal Properties internal UIElement IntChild { get { return _child; } set { _child = value; } } #endregion #region Private Members UIElement _child; #endregion Private Members } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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