Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / InputElement.cs / 1305600 / InputElement.cs
using System.Windows.Media; using MS.Win32; using MS.Internal; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using System.Windows.Interop; using System.Windows.Media.Media3D; using System; namespace System.Windows.Input { // Helper class for working with IInputElement objects. internal static class InputElement { // Return whether the InputElement is one of our types. internal static bool IsValid(IInputElement e) { DependencyObject o = e as DependencyObject; return IsValid(o); } internal static bool IsValid(DependencyObject o) { return IsUIElement(o) || IsContentElement(o) || IsUIElement3D(o); } // Returns whether the given DynamicObject is a UIElement or not. internal static bool IsUIElement(DependencyObject o) { return UIElementType.IsInstanceOfType(o); } // Returns whether the given DynamicObject is a UIElement3D or not. internal static bool IsUIElement3D(DependencyObject o) { return UIElement3DType.IsInstanceOfType(o); } // Returns whether the given DynamicObject is a ContentElement or not. internal static bool IsContentElement(DependencyObject o) { return ContentElementType.IsInstanceOfType(o); } // Returns the containing input element of the given DynamicObject. // If onlyTraverse2D is set to true, then we stop once we see a 3D object and return null internal static DependencyObject GetContainingUIElement(DependencyObject o, bool onlyTraverse2D) { DependencyObject container = null; Visual v; Visual3D v3D; if(o != null) { if(IsUIElement(o)) { container = o; } else if (IsUIElement3D(o) && !onlyTraverse2D) { container = o; } else if(IsContentElement(o)) { DependencyObject parent = ContentOperations.GetParent((ContentElement)o); if(parent != null) { container = GetContainingUIElement(parent, onlyTraverse2D); } else { // parent = ((ContentElement)o).GetUIParentCore(); if(parent != null) { container = GetContainingUIElement(parent, onlyTraverse2D); } } } else if ((v = o as Visual) != null) { DependencyObject parent = VisualTreeHelper.GetParent(v); if(parent != null) { container = GetContainingUIElement(parent, onlyTraverse2D); } } else if (!onlyTraverse2D && (v3D = o as Visual3D) != null) { DependencyObject parent = VisualTreeHelper.GetParent(v3D); if (parent != null) { container = GetContainingUIElement(parent, onlyTraverse2D); } } } return container; } // Returns the containing input element of the given DynamicObject. internal static DependencyObject GetContainingUIElement(DependencyObject o) { return GetContainingUIElement(o, false); } // Returns the containing input element of the given DynamicObject. // If onlyTraverse2D is set to true, then we stop once we see a 3D object and return null internal static IInputElement GetContainingInputElement(DependencyObject o, bool onlyTraverse2D) { IInputElement container = null; Visual v; Visual3D v3D; if(o != null) { if(IsUIElement(o)) { container = (UIElement) o; } else if(IsContentElement(o)) { container = (ContentElement) o; } else if (IsUIElement3D(o) && !onlyTraverse2D) { container = (UIElement3D)o; } else if((v = o as Visual) != null) { DependencyObject parent = VisualTreeHelper.GetParent(v); if(parent != null) { container = GetContainingInputElement(parent, onlyTraverse2D); } } else if (!onlyTraverse2D && (v3D = o as Visual3D) != null) { DependencyObject parent = VisualTreeHelper.GetParent(v3D); if (parent != null) { container = GetContainingInputElement(parent, onlyTraverse2D); } } } return container; } // Returns the containing input element of the given DynamicObject. // internal static IInputElement GetContainingInputElement(DependencyObject o) { return GetContainingInputElement(o, false); } // Returns the containing visual of the given DynamicObject. internal static DependencyObject GetContainingVisual(DependencyObject o) { DependencyObject v = null; if(o != null) { if(IsUIElement(o)) { v = (Visual)o; } else if (IsUIElement3D(o)) { v = (Visual3D)o; } else if(IsContentElement(o)) { DependencyObject parent = ContentOperations.GetParent((ContentElement)o); if(parent != null) { v = GetContainingVisual(parent); } else { // parent = ((ContentElement)o).GetUIParentCore(); if(parent != null) { v = GetContainingVisual(parent); } } } else { v = o as Visual; if (v == null) { v = o as Visual3D; } } } return v; } // Returns the root visual of the containing element. internal static DependencyObject GetRootVisual(DependencyObject o) { return GetRootVisual(o, true /* enable2DTo3DTransition */); } internal static DependencyObject GetRootVisual(DependencyObject o, bool enable2DTo3DTransition) { DependencyObject rootVisual = GetContainingVisual(o); DependencyObject parentVisual; while(rootVisual != null && ((parentVisual = VisualTreeHelper.GetParent(rootVisual)) != null)) { // if we are not supposed to transition from 2D to 3D and the root // is a Visual and the parent is a Visual3D break if (!enable2DTo3DTransition && rootVisual is Visual && parentVisual is Visual3D) { break; } rootVisual = parentVisual; } return rootVisual; } ////// Critical: This code accesses PresetationSource /// TreatAsSafe: This code does not expose the critical resource. /// Translating points considered safe to expose. /// [SecurityCritical,SecurityTreatAsSafe] internal static Point TranslatePoint(Point pt, DependencyObject from, DependencyObject to) { bool unused = false; return TranslatePoint(pt, from, to, out unused); } ////// Critical: This code accesses PresetationSource /// TreatAsSafe: This code does not expose the critical resource. /// Translating points considered safe to expose. /// [SecurityCritical,SecurityTreatAsSafe] internal static Point TranslatePoint(Point pt, DependencyObject from, DependencyObject to, out bool translated) { translated = false; Point ptTranslated = pt; // Get the containing and root visuals we are coming from. DependencyObject vFromAsDO = InputElement.GetContainingVisual(from); Visual rootFrom = InputElement.GetRootVisual(from) as Visual; Visual vFrom = vFromAsDO as Visual; if (vFromAsDO != null && vFrom == null) { // must be a Visual3D - get it's 2D visual parent vFrom = VisualTreeHelper.GetContainingVisual2D(vFromAsDO); } if(vFrom != null && rootFrom != null) { GeneralTransform gUp; Matrix mUp; bool isUpSimple = false; isUpSimple = vFrom.TrySimpleTransformToAncestor(rootFrom, false, /* do not apply inverse */ out gUp, out mUp); if (isUpSimple) { ptTranslated = mUp.Transform(ptTranslated); } else if (gUp.TryTransform(ptTranslated, out ptTranslated) == false) { // Error. Out parameter has been set false. return new Point(); } // If no element was specified to translate to, we leave the coordinates // translated to the root. if(to != null) { // Get the containing and root visuals we are going to. DependencyObject vTo = InputElement.GetContainingVisual(to); Visual rootTo = InputElement.GetRootVisual(to) as Visual; if(vTo != null && rootTo != null) { // If both are under the same root visual, we can easily translate the point // between them by translating up to the root, and then back down. // // However, if both are under different roots, we can only translate // between them if we know how to relate the two root visuals. Currently // we only know how to do that if both roots are sourced in HwndSources. if(rootFrom != rootTo) { HwndSource sourceFrom = PresentationSource.CriticalFromVisual(rootFrom) as HwndSource; HwndSource sourceTo = PresentationSource.CriticalFromVisual(rootTo) as HwndSource; if(sourceFrom != null && sourceFrom.CriticalHandle != IntPtr.Zero && sourceFrom.CompositionTarget != null && sourceTo != null && sourceTo.CriticalHandle != IntPtr.Zero && sourceTo.CompositionTarget != null) { // Translate the point into client coordinates. ptTranslated = PointUtil.RootToClient(ptTranslated, sourceFrom); // Translate the point into screen coordinates. Point ptScreen = PointUtil.ClientToScreen(ptTranslated, sourceFrom); // Translate the point back the the client coordinates of the To window. ptTranslated = PointUtil.ScreenToClient(ptScreen, sourceTo); // Translate the point back to the root element. ptTranslated = PointUtil.ClientToRoot(ptTranslated, sourceTo); } else { // Error. Out parameter has been set false. return new Point(); } } // Translate the point from the root to the visual. GeneralTransform gDown; Matrix mDown; Visual vToAsVisual = vTo as Visual; if (vToAsVisual == null) { // must be a Visual3D vToAsVisual = VisualTreeHelper.GetContainingVisual2D(vTo); } bool isDownSimple = vToAsVisual.TrySimpleTransformToAncestor(rootTo, true, /* apply inverse */ out gDown, out mDown); if (isDownSimple) { ptTranslated = mDown.Transform(ptTranslated); } else if (gDown != null) { if (gDown.TryTransform(ptTranslated, out ptTranslated) == false) { // Error. Out parameter has been set false. return new Point(); } } else { // Error. Out parameter has been set false. return new Point(); } } else { // Error. Out parameter has been set false. return new Point(); } } } else { // Error. Out parameter has been set false. return new Point(); } translated = true; return ptTranslated; } // Caches the ContentElement's DependencyObjectType private static DependencyObjectType ContentElementType = DependencyObjectType.FromSystemTypeInternal(typeof(ContentElement)); // Caches the UIElement's DependencyObjectType private static DependencyObjectType UIElementType = DependencyObjectType.FromSystemTypeInternal(typeof(UIElement)); // Caches the UIElement3D's DependencyObjectType private static DependencyObjectType UIElement3DType = DependencyObjectType.FromSystemTypeInternal(typeof(UIElement3D)); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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