Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Controls / TemplatedAdorner.cs / 1305600 / TemplatedAdorner.cs
//---------------------------------------------------------------------------- // //// Copyright (C) 2005 by Microsoft Corporation. All rights reserved. // // // // Description: // TemplatedAdorner applies the style provided in the ctor to a // control and provides a transform via GetDesiredTransform that // will cause the AdornedElementPlaceholder to be positioned directly // over the AdornedElement. // // 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.Controls; using System.Windows.Documents; using MS.Utility; namespace MS.Internal.Controls { ////// This class is sealed because it calls OnVisualChildrenChanged virtual in the /// constructor and it does not override it, but derived classes could. /// internal sealed class TemplatedAdorner: Adorner { private Control _child; ////// The clear the single child of a TemplatedAdorner /// public void ClearChild() { this.RemoveVisualChild(_child); _child = null; } public TemplatedAdorner(UIElement adornedElement, ControlTemplate adornerTemplate) : base(adornedElement) { Debug.Assert(adornedElement != null, "adornedElement should not be null"); Debug.Assert(adornerTemplate != null, "adornerTemplate should not be null"); Control control = new Control(); control.DataContext = Validation.GetErrors(adornedElement); //control.IsEnabled = false; // Hittest should not work on visual subtree control.IsTabStop = false; // Tab should not get into adorner layer control.Template = adornerTemplate; _child = control; this.AddVisualChild(_child); } ////// Adorners don't always want to be transformed in the same way as the elements they /// adorn. Adorners which adorn points, such as resize handles, want to be translated /// and rotated but not scaled. Adorners adorning an object, like a marquee, may want /// all transforms. This method is called by AdornerLayer to allow the adorner to /// filter out the transforms it doesn't want and return a new transform with just the /// transforms it wants applied. An adorner can also add an additional translation /// transform at this time, allowing it to be positioned somewhere other than the upper /// left corner of its adorned element. /// /// The transform applied to the object the adorner adorns ///Transform to apply to the adorner public override GeneralTransform GetDesiredTransform(GeneralTransform transform) { if (ReferenceElement == null) return transform; GeneralTransformGroup group = new GeneralTransformGroup(); group.Children.Add(transform); GeneralTransform t = this.TransformToDescendant(ReferenceElement); if (t != null) { group.Children.Add(t); } return group; } public FrameworkElement ReferenceElement { get { return _referenceElement; } set { _referenceElement = value; } } ////// Derived class must implement to support Visual children. The method must return /// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1. /// /// By default a Visual does not have any children. /// /// Remark: /// During this virtual call it is not valid to modify the Visual tree. /// protected override Visual GetVisualChild(int index) { if(_child == null || index != 0) { throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange)); } return _child; } ////// Derived classes override this property to enable the Visual code to enumerate /// the Visual children. Derived classes need to return the number of children /// from this method. /// /// By default a Visual does not have any children. /// /// Remark: During this virtual method the Visual tree must not be modified. /// protected override int VisualChildrenCount { get { return _child != null ? 1 : 0; } } ////// Measure adorner. /// protected override Size MeasureOverride(Size constraint) { Debug.Assert(_child != null, "_child should not be null"); if (ReferenceElement != null && AdornedElement != null && AdornedElement.IsMeasureValid && !DoubleUtil.AreClose(ReferenceElement.DesiredSize, AdornedElement.DesiredSize) ) { ReferenceElement.InvalidateMeasure(); } (_child).Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity)); return (_child).DesiredSize; } ////// Default control arrangement is to only arrange /// the first visual child. No transforms will be applied. /// protected override Size ArrangeOverride(Size size) { Size finalSize; finalSize = base.ArrangeOverride(size); if (_child != null) { _child.Arrange(new Rect(new Point(), finalSize)); } return finalSize; } internal override bool NeedsUpdate(Size oldSize) { bool result = base.NeedsUpdate(oldSize); Visibility desired = AdornedElement.IsVisible ? Visibility.Visible : Visibility.Collapsed; if (desired != this.Visibility) { this.Visibility = desired; result = true; } return result; } private FrameworkElement _referenceElement; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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