Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / AdornedElementPlaceholder.cs / 1305600 / AdornedElementPlaceholder.cs
//---------------------------------------------------------------------------- // //// Copyright (C) 2005 by Microsoft Corporation. All rights reserved. // // // // Description: // AdornedElementPlaceholder is an element used in a Binding.ErrorTemplate. // Its purpose is to mimic the height and width of the AdornedElement so that // other elements in Template can be arranged around or within it. // // See specs at http://avalon/connecteddata/Specs/Validation.mht // // History: // 02/01/2005 mharper: created. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Windows.Media; using System.Windows; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Markup; using MS.Internal.Controls; using MS.Utility; namespace System.Windows.Controls { ////// The base class for all controls. /// [ContentProperty("Child")] public class AdornedElementPlaceholder : FrameworkElement, IAddChild { #region Constructors ////// Default Control constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public AdornedElementPlaceholder() : base() { } #endregion Constructors ////// This method is called to Add the object as a child. This method is used primarily /// by the parser; a more direct way of adding a child is to use the /// /// The object to add as a child; it must be a UIElement. /// void IAddChild.AddChild (Object value) { // keeping consistent with other elements: adding null is a no-op. if (value == null) return; 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. /// Calling this method has no effect if text is just whitespace. If text is not /// just whitespace, throw an exception. /// /// /// Text to add as a child. /// void IAddChild.AddText (string text) { XamlSerializerUtil.ThrowIfNonWhiteSpaceInAddText(text, this); } ////// Element for which the AdornedElementPlaceholder is reserving space. /// public UIElement AdornedElement { get { TemplatedAdorner adorner = TemplatedAdorner; return adorner == null ? null : TemplatedAdorner.AdornedElement; } } ////// The single child of an [DefaultValue(null)] public virtual UIElement Child { get { return _child; } set { UIElement old = _child; if (old != value) { RemoveVisualChild(old); //need to remove old element from logical tree RemoveLogicalChild(old); _child = value; AddVisualChild(_child); AddLogicalChild(value); InvalidateMeasure(); } } } ////// /// Gets the Visual children count. /// protected override int VisualChildrenCount { get { return (_child == null) ? 0 : 1; } } ////// Gets the Visual 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; } ////// Returns enumerator to logical children. /// protected internal override IEnumerator LogicalChildren { get { // Could optimize this code by returning EmptyEnumerator.Instance if _child == null. return new SingleChildEnumerator(_child); } } ////// This virtual method in called when IsInitialized is set to true and it raises an Initialized event /// protected override void OnInitialized(EventArgs e) { if (TemplatedParent == null) throw new InvalidOperationException(SR.Get(SRID.AdornedElementPlaceholderMustBeInTemplate)); base.OnInitialized(e); } ////// AdornedElementPlaceholder measure behavior is to measure /// only the first visual child. Note that the return value /// of Measure on this child is ignored as the purpose of this /// class is to match the size of the element for which this /// is a placeholder. /// /// The measurement constraints. ///The desired size of the control. protected override Size MeasureOverride(Size constraint) { if (TemplatedParent == null) throw new InvalidOperationException(SR.Get(SRID.AdornedElementPlaceholderMustBeInTemplate)); if (AdornedElement == null) return new Size(0,0); Size desiredSize = AdornedElement.RenderSize; UIElement child = Child; if (child != null) child.Measure(desiredSize); return desiredSize; } ////// Default AdornedElementPlaceholder arrangement is to only arrange /// the first visual child. No transforms will be applied. /// /// The computed size. protected override Size ArrangeOverride(Size arrangeBounds) { UIElement child = Child; if (child != null) child.Arrange(new Rect(arrangeBounds)); return arrangeBounds; } private TemplatedAdorner TemplatedAdorner { get { if (_templatedAdorner == null) { // find the TemplatedAdorner FrameworkElement templateParent = this.TemplatedParent as FrameworkElement; if (templateParent != null) { _templatedAdorner = VisualTreeHelper.GetParent(templateParent) as TemplatedAdorner; if (_templatedAdorner != null && _templatedAdorner.ReferenceElement == null) { _templatedAdorner.ReferenceElement = this; } } } return _templatedAdorner; } } private UIElement _child; private TemplatedAdorner _templatedAdorner; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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