Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / UIElement3D.cs / 1 / UIElement3D.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // //----------------------------------------------------------------------------- using MS.Utility; using MS.Internal; using MS.Internal.Media; using MS.Internal.PresentationCore; using MS.Internal.KnownBoxes; using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.ComponentModel; using System.Security; using System.Security.Permissions; using System.Windows.Automation.Peers; using System.Windows.Input; using System.Windows.Interop; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Media.Composition; using System.Windows.Media.Effects; using System.Windows.Media.Media3D; using System.Windows.Markup; using System.Windows.Threading; using System.Windows.Input.StylusPlugIns; namespace System.Windows { ////// UIElement3D is the base class for frameworks building on the Windows Presentation Core. /// ////// UIElement3D adds to the base visual class "IFE" - Input, Focus, and Eventing. /// public abstract partial class UIElement3D : Visual3D, IInputElement { ////// Critical: This code is used to register various thunks that are used to send input to the tree /// TreatAsSafe: This code attaches handlers that are inside the class and private. Not configurable or overridable /// [SecurityCritical,SecurityTreatAsSafe] static UIElement3D() { RegisterEvents(); // add owner and then override metadata for IsVisibile IsVisibleProperty = UIElement.IsVisibleProperty.AddOwner(typeof(UIElement3D)); _isVisibleMetadata = new ReadOnlyPropertyMetadata(BooleanBoxes.FalseBox, new GetReadOnlyValueCallback(GetIsVisible), new PropertyChangedCallback(OnIsVisibleChanged)); IsVisibleProperty.OverrideMetadata(typeof(UIElement3D), _isVisibleMetadata, UIElement.IsVisiblePropertyKey); // add owner and then override metadta for IsFocused IsFocusedProperty = UIElement.IsFocusedProperty.AddOwner(typeof(UIElement3D)); IsFocusedProperty.OverrideMetadata(typeof(UIElement3D), new PropertyMetadata( BooleanBoxes.FalseBox, // default value new PropertyChangedCallback(IsFocused_Changed)), UIElement.IsFocusedPropertyKey); } ////// Constructor. This form of constructor will encounter a slight perf hit since it needs to initialize Dispatcher for the instance. /// protected UIElement3D() { _children = new Visual3DCollection(this); Initialize(); } private void Initialize() { BeginPropertyInitialization(); VisibilityCache = (Visibility) VisibilityProperty.GetDefaultValue(DependencyObjectType); // Note: IsVisibleCache is false by default. // to cause the first render to occur InvalidateModel(); } #region AllowDrop ////// The DependencyProperty for the AllowDrop property. /// public static readonly DependencyProperty AllowDropProperty = UIElement.AllowDropProperty.AddOwner( typeof(UIElement3D), new PropertyMetadata(BooleanBoxes.FalseBox)); ////// A dependency property that allows the drop object as DragDrop target. /// public bool AllowDrop { get { return (bool) GetValue(AllowDropProperty); } set { SetValue(AllowDropProperty, BooleanBoxes.Box(value)); } } #endregion AllowDrop private object CallRenderCallback(object o) { OnUpdateModel(); _renderRequestPosted = false; return null; } ////// Invalidates the rendering of the element. /// Causes public void InvalidateModel() { if(!_renderRequestPosted) { MediaContext.From(Dispatcher).BeginInvokeOnRender(CallRenderCallback, this); _renderRequestPosted = true; } } ///to be called at a later time. /// /// This class provides a point for subclasses to access the protected content of the /// UIElement to set what the geometry they should render should be. /// protected virtual void OnUpdateModel() { } ////// OnVisualParentChanged is called when the parent of the Visual3D is changed. /// /// Old parent or null if the Visual3D did not have a parent before. protected internal override void OnVisualParentChanged(DependencyObject oldParent) { // Synchronize ForceInherit properties if (InternalVisualParent != null) { DependencyObject parent = InternalVisualParent; if (!InputElement.IsUIElement(parent) && !InputElement.IsUIElement3D(parent)) { Visual parentAsVisual = parent as Visual; if (parentAsVisual != null) { // We are being plugged into a non-UIElement visual. This // means that our parent doesn't play by the same rules we // do, so we need to track changes to our ancestors in // order to bridge the gap. parentAsVisual.VisualAncestorChanged += new Visual.AncestorChangedEventHandler(OnVisualAncestorChanged_ForceInherit); } else { Visual3D parentAsVisual3D = parent as Visual3D; if (parentAsVisual3D != null) { // We are being plugged into a non-UIElement visual. This // means that our parent doesn't play by the same rules we // do, so we need to track changes to our ancestors in // order to bridge the gap. parentAsVisual3D.VisualAncestorChanged += new Visual.AncestorChangedEventHandler(OnVisualAncestorChanged_ForceInherit); } } // find a UIElement(3D) ancestor to use for coersion parent = InputElement.GetContainingUIElement(parentAsVisual); } if (parent != null) { UIElement.SynchronizeForceInheritProperties(null, null, this, parent); } else { // We don't have a UIElement parent or ancestor, so no // coersions are necessary at this time. } } else { DependencyObject parent = oldParent; if (!InputElement.IsUIElement(parent) && !InputElement.IsUIElement3D(parent)) { // We are being unplugged from a non-UIElement visual. This // means that our parent didn't play by the same rules we // do, so we started track changes to our ancestors in // order to bridge the gap. Now we can stop. if (oldParent is Visual) { ((Visual) oldParent).VisualAncestorChanged -= new Visual.AncestorChangedEventHandler(OnVisualAncestorChanged_ForceInherit); } else if (oldParent is Visual3D) { ((Visual3D) oldParent).VisualAncestorChanged -= new Visual.AncestorChangedEventHandler(OnVisualAncestorChanged_ForceInherit); } // Try to find a UIElement ancestor to use for coersion. parent = InputElement.GetContainingUIElement(oldParent); } if (parent != null) { UIElement.SynchronizeForceInheritProperties(null, null, this, parent); } else { // We don't have a UIElement parent or ancestor, so no // coersions are necessary at this time. } } // Synchronize ReverseInheritProperty Flags // // NOTE: do this AFTER synchronizing force-inherited flags, since // they often effect focusability and such. this.SynchronizeReverseInheritPropertyFlags(oldParent, true); } private void OnVisualAncestorChanged_ForceInherit(object sender, AncestorChangedEventArgs e) { // NOTE: // // We are forced to listen to AncestorChanged events because // a UIElement may have raw Visuals between it and its nearest // UIElement parent. We only care about changes that happen // to the visual tree BETWEEN this UIElement and its nearest // UIElement parent. This is because we can rely on our // nearest UIElement parent to notify us when its force-inherit // properties change. DependencyObject parent = null; if(e.OldParent == null) { // We were plugged into something. // Find our nearest UIElement parent. parent = InputElement.GetContainingUIElement(InternalVisualParent); // See if this parent is a child of the ancestor who's parent changed. // If so, we don't care about changes that happen above us. if(parent != null && VisualTreeHelper.IsAncestorOf(e.Ancestor, parent)) { parent = null; } } else { // we were unplugged from something. // Find our nearest UIElement parent. parent = InputElement.GetContainingUIElement(InternalVisualParent); if(parent != null) { // If we found a UIElement parent in our subtree, the // break in the visual tree must have been above it, // so we don't need to respond. parent = null; } else { // There was no UIElement parent in our subtree, so we // may be detaching from some UIElement parent above // the break point in the tree. parent = InputElement.GetContainingUIElement(e.OldParent); } } if(parent != null) { UIElement.SynchronizeForceInheritProperties(null, null, this, parent); } } internal void OnVisualAncestorChanged(object sender, AncestorChangedEventArgs e) { UIElement3D uie3D = sender as UIElement3D; if(null != uie3D) PresentationSource.OnVisualAncestorChanged(uie3D, e); } internal DependencyObject GetUIParent(bool continuePastVisualTree) { return UIElementHelper.GetUIParent(this, continuePastVisualTree); } ////// Called to get the UI parent of this element when there is /// no visual parent. /// ////// Returns a non-null value when some framework implementation /// of this method has a non-visual parent connection, /// protected internal DependencyObject GetUIParentCore() { // return null; } #region LoadedAndUnloadedEvents ////// Initiate the processing for [Un]Loaded event broadcast starting at this node /// internal virtual void OnPresentationSourceChanged(bool attached) { // Reset the FocusedElementProperty in order to get LostFocus event if (!attached && FocusManager.GetFocusedElement(this)!=null) FocusManager.SetFocusedElement(this, null); } #endregion LoadedAndUnloadedEvents // // Left/Right Mouse Button Cracking Routines: // internal static RoutedEvent CrackMouseButtonEvent(MouseButtonEventArgs e) { RoutedEvent newEvent = null; switch(e.ChangedButton) { case MouseButton.Left: if(e.RoutedEvent == Mouse.PreviewMouseDownEvent) newEvent = UIElement3D.PreviewMouseLeftButtonDownEvent; else if(e.RoutedEvent == Mouse.MouseDownEvent) newEvent = UIElement3D.MouseLeftButtonDownEvent; else if(e.RoutedEvent == Mouse.PreviewMouseUpEvent) newEvent = UIElement3D.PreviewMouseLeftButtonUpEvent; else newEvent = UIElement3D.MouseLeftButtonUpEvent; break; case MouseButton.Right: if(e.RoutedEvent == Mouse.PreviewMouseDownEvent) newEvent = UIElement3D.PreviewMouseRightButtonDownEvent; else if(e.RoutedEvent == Mouse.MouseDownEvent) newEvent = UIElement3D.MouseRightButtonDownEvent; else if(e.RoutedEvent == Mouse.PreviewMouseUpEvent) newEvent = UIElement3D.PreviewMouseRightButtonUpEvent; else newEvent = UIElement3D.MouseRightButtonUpEvent; break; default: // No wrappers exposed for the other buttons. break; } return ( newEvent ); } private void CrackMouseButtonEventAndReRaiseEvent(MouseButtonEventArgs e) { RoutedEvent newEvent = CrackMouseButtonEvent(e); if(newEvent != null) { ReRaiseEventAs(e, newEvent); } } ////// A property indicating if the mouse is over this element or not. /// public bool IsMouseDirectlyOver { get { // We do not return the cached value of reverse-inherited seed properties. // // The cached value is only used internally to detect a "change". // // More Info: // The act of invalidating the seed property of a reverse-inherited property // on the first side of the path causes the invalidation of the // reverse-inherited properties on both sides. The input system has not yet // invalidated the seed property on the second side, so its cached value can // be incorrect. // return IsMouseDirectlyOver_ComputeValue(); } } private bool IsMouseDirectlyOver_ComputeValue() { return (Mouse.DirectlyOver == this); } #region new ////// Asynchronously re-evaluate the reverse-inherited properties. /// [FriendAccessAllowed] internal void SynchronizeReverseInheritPropertyFlags(DependencyObject oldParent, bool isCoreParent) { if(IsKeyboardFocusWithin) { Keyboard.PrimaryDevice.ReevaluateFocusAsync(this, oldParent, isCoreParent); } // Reevelauate the stylus properties first to guarentee that our property change // notifications fire before mouse properties. if(IsStylusOver) { StylusLogic.CurrentStylusLogicReevaluateStylusOver(this, oldParent, isCoreParent); } if(IsStylusCaptureWithin) { StylusLogic.CurrentStylusLogicReevaluateCapture(this, oldParent, isCoreParent); } if(IsMouseOver) { Mouse.PrimaryDevice.ReevaluateMouseOver(this, oldParent, isCoreParent); } if(IsMouseCaptureWithin) { Mouse.PrimaryDevice.ReevaluateCapture(this, oldParent, isCoreParent); } } ////// Controls like popup want to control updating parent properties. This method /// provides an opportunity for those controls to participate and block it. /// internal virtual bool BlockReverseInheritance() { return false; } ////// A property indicating if the mouse is over this element or not. /// public bool IsMouseOver { get { return ReadFlag(CoreFlags.IsMouseOverCache); } } ////// A property indicating if the stylus is over this element or not. /// public bool IsStylusOver { get { return ReadFlag(CoreFlags.IsStylusOverCache); } } ////// Indicates if Keyboard Focus is anywhere /// within in the subtree starting at the /// current instance /// public bool IsKeyboardFocusWithin { get { return ReadFlag(CoreFlags.IsKeyboardFocusWithinCache); } } #endregion new ////// A property indicating if the mouse is captured to this element or not. /// public bool IsMouseCaptured { get { return (bool) GetValue(IsMouseCapturedProperty); } } ////// Captures the mouse to this element. /// public bool CaptureMouse() { return Mouse.Capture(this); } ////// Releases the mouse capture. /// public void ReleaseMouseCapture() { if (Mouse.Captured == this) { Mouse.Capture(null); } } ////// Indicates if mouse capture is anywhere within the subtree /// starting at the current instance /// public bool IsMouseCaptureWithin { get { return ReadFlag(CoreFlags.IsMouseCaptureWithinCache); } } ////// A property indicating if the stylus is over this element or not. /// public bool IsStylusDirectlyOver { get { // We do not return the cached value of reverse-inherited seed properties. // // The cached value is only used internally to detect a "change". // // More Info: // The act of invalidating the seed property of a reverse-inherited property // on the first side of the path causes the invalidation of the // reverse-inherited properties on both sides. The input system has not yet // invalidated the seed property on the second side, so its cached value can // be incorrect. // return IsStylusDirectlyOver_ComputeValue(); } } private bool IsStylusDirectlyOver_ComputeValue() { return (Stylus.DirectlyOver == this); } ////// A property indicating if the stylus is captured to this element or not. /// public bool IsStylusCaptured { get { return (bool) GetValue(IsStylusCapturedProperty); } } ////// Captures the stylus to this element. /// public bool CaptureStylus() { return Stylus.Capture(this); } ////// Releases the stylus capture. /// public void ReleaseStylusCapture() { Stylus.Capture(null); } ////// Indicates if stylus capture is anywhere within the subtree /// starting at the current instance /// public bool IsStylusCaptureWithin { get { return ReadFlag(CoreFlags.IsStylusCaptureWithinCache); } } ////// A property indicating if the keyboard is focused on this /// element or not. /// public bool IsKeyboardFocused { get { // We do not return the cached value of reverse-inherited seed properties. // // The cached value is only used internally to detect a "change". // // More Info: // The act of invalidating the seed property of a reverse-inherited property // on the first side of the path causes the invalidation of the // reverse-inherited properties on both sides. The input system has not yet // invalidated the seed property on the second side, so its cached value can // be incorrect. // return IsKeyboardFocused_ComputeValue(); } } private bool IsKeyboardFocused_ComputeValue() { return (Keyboard.FocusedElement == this); } ////// Set a logical focus on the element. If the current keyboard focus is within the same scope move the keyboard on this element. /// public bool Focus() { if (Keyboard.Focus(this) == this) { // Successfully setting the keyboard focus updated the logical focus as well return true; } if (Focusable && IsEnabled) { // If we cannot set keyboard focus then set the logical focus only // Find element's FocusScope and set its FocusedElement if not already set // If FocusedElement is already set we don't want to steal focus for that scope DependencyObject focusScope = FocusManager.GetFocusScope(this); if (FocusManager.GetFocusedElement(focusScope) == null) { FocusManager.SetFocusedElement(focusScope, (IInputElement)this); } } // Return false because current KeyboardFocus is not set on the element - only the logical focus is set return false; } ////// Request to move the focus from this element to another element /// /// Determine how to move the focus ///Returns true if focus is moved successfully. Returns false if there is no next element public virtual bool MoveFocus(TraversalRequest request) { return false; } ////// Request to predict the element that should receive focus relative to this element for a /// given direction, without actually moving focus to it. /// /// The direction for which focus should be predicted ////// Returns the next element that focus should move to for a given FocusNavigationDirection. /// Returns null if focus cannot be moved relative to this element. /// public virtual DependencyObject PredictFocus(FocusNavigationDirection direction) { return null; } ////// The access key for this element was invoked. Base implementation sets focus to the element. /// /// The arguments to the access key event protected virtual void OnAccessKey(AccessKeyEventArgs e) { this.Focus(); } ////// A property indicating if the inptu method is enabled. /// public bool IsInputMethodEnabled { get { return (bool) GetValue(InputMethod.IsInputMethodEnabledProperty); } } ////// The Visibility property. /// [CommonDependencyProperty] public static readonly DependencyProperty VisibilityProperty = UIElement.VisibilityProperty.AddOwner( typeof(UIElement3D), new PropertyMetadata( VisibilityBoxes.VisibleBox, new PropertyChangedCallback(OnVisibilityChanged))); private static void OnVisibilityChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement3D uie = (UIElement3D) d; Visibility newVisibility = (Visibility) e.NewValue; uie.VisibilityCache = newVisibility; uie.switchVisibilityIfNeeded(newVisibility); // The IsVisible property depends on this property. uie.UpdateIsVisibleCache(); } private static bool ValidateVisibility(object o) { Visibility value = (Visibility) o; return (value == Visibility.Visible) || (value == Visibility.Hidden) || (value == Visibility.Collapsed); } ////// Visibility accessor /// [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] public Visibility Visibility { get { return VisibilityCache; } set { SetValue(VisibilityProperty, VisibilityBoxes.Box(value)); } } private void switchVisibilityIfNeeded(Visibility visibility) { switch(visibility) { case Visibility.Visible: ensureVisible(); break; case Visibility.Hidden: ensureInvisible(false); break; case Visibility.Collapsed: ensureInvisible(true); break; } } private void ensureVisible() { InternalIsVisible = true; } private void ensureInvisible(bool collapsed) { InternalIsVisible = false; if(!ReadFlag(CoreFlags.IsCollapsed) && collapsed) //Hidden or Visible->Collapsed { WriteFlag(CoreFlags.IsCollapsed, true); } else if(ReadFlag(CoreFlags.IsCollapsed) && !collapsed) //Collapsed -> Hidden { WriteFlag(CoreFlags.IsCollapsed, false); } } // Internal accessor for AccessKeyManager class internal void InvokeAccessKey(AccessKeyEventArgs e) { OnAccessKey(e); } ////// GotFocus event /// public static readonly RoutedEvent GotFocusEvent = FocusManager.GotFocusEvent.AddOwner(typeof(UIElement3D)); ////// An event announcing that IsFocused changed to true. /// public event RoutedEventHandler GotFocus { add { AddHandler(GotFocusEvent, value); } remove { RemoveHandler(GotFocusEvent, value); } } ////// LostFocus event /// public static readonly RoutedEvent LostFocusEvent = FocusManager.LostFocusEvent.AddOwner(typeof(UIElement3D)); ////// An event announcing that IsFocused changed to false. /// public event RoutedEventHandler LostFocus { add { AddHandler(LostFocusEvent, value); } remove { RemoveHandler(LostFocusEvent, value); } } ////// The DependencyProperty for IsFocused. /// Flags: None /// Read-Only: true /// public static readonly DependencyProperty IsFocusedProperty; private static void IsFocused_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement3D uiElement3D = ((UIElement3D)d); if ((bool) e.NewValue) { uiElement3D.OnGotFocus(new RoutedEventArgs(GotFocusEvent, uiElement3D)); } else { uiElement3D.OnLostFocus(new RoutedEventArgs(LostFocusEvent, uiElement3D)); } } ////// This method is invoked when the IsFocused property changes to true /// /// RoutedEventArgs protected virtual void OnGotFocus(RoutedEventArgs e) { RaiseEvent(e); } ////// This method is invoked when the IsFocused property changes to false /// /// RoutedEventArgs protected virtual void OnLostFocus(RoutedEventArgs e) { RaiseEvent(e); } ////// Gettor for IsFocused Property /// public bool IsFocused { get { return (bool) GetValue(IsFocusedProperty); } } //********************************************************************* #region IsEnabled Property //********************************************************************* ////// The DependencyProperty for the IsEnabled property. /// [CommonDependencyProperty] public static readonly DependencyProperty IsEnabledProperty = UIElement.IsEnabledProperty.AddOwner( typeof(UIElement3D), new UIPropertyMetadata( BooleanBoxes.TrueBox, // default value new PropertyChangedCallback(OnIsEnabledChanged), new CoerceValueCallback(CoerceIsEnabled))); ////// A property indicating if this element is enabled or not. /// public bool IsEnabled { get { return (bool) GetValue(IsEnabledProperty);} set { SetValue(IsEnabledProperty, BooleanBoxes.Box(value)); } } ////// IsEnabledChanged event /// public event DependencyPropertyChangedEventHandler IsEnabledChanged { add {EventHandlersStoreAdd(UIElement.IsEnabledChangedKey, value);} remove {EventHandlersStoreRemove(UIElement.IsEnabledChangedKey, value);} } ////// Fetches the value that IsEnabled should be coerced to. /// ////// This method is virtual is so that controls derived from UIElement3D /// can combine additional requirements into the coersion logic. /// /// It is important for anyone overriding this property to also /// call CoerceValue when any of their dependencies change. /// protected virtual bool IsEnabledCore { get { return true; } } private static object CoerceIsEnabled(DependencyObject d, object value) { UIElement3D uie = (UIElement3D) d; // We must be false if our parent is false, but we can be // either true or false if our parent is true. // // Another way of saying this is that we can only be true // if our parent is true, but we can always be false. if((bool) value) { // Our parent can constrain us. We can be plugged into either // a "visual" or "content" tree. If we are plugged into a // "content" tree, the visual tree is just considered a // visual representation, and is normally composed of raw // visuals, not UIElement3Ds, so we prefer the content tree. // // The content tree uses the "logical" links. But not all // "logical" links lead to a content tree. // DependencyObject parent = uie.GetUIParentCore() as ContentElement; if(parent == null) { parent = InputElement.GetContainingUIElement(uie.InternalVisualParent); } if(parent == null || (bool)parent.GetValue(UIElement.IsEnabledProperty)) { return BooleanBoxes.Box(uie.IsEnabledCore); } else { return BooleanBoxes.FalseBox; } } else { return BooleanBoxes.FalseBox; } } private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement3D uie = (UIElement3D)d; // Raise the public changed event. uie.RaiseDependencyPropertyChanged(UIElement.IsEnabledChangedKey, e); // Invalidate the children so that they will inherit the new value. InvalidateForceInheritPropertyOnChildren(uie, e.Property); // The input manager needs to re-hittest because something changed // that is involved in the hit-testing we do, so a different result // could be returned. InputManager.SafeCurrentNotifyHitTestInvalidated(); //Notify Automation in case it is interested. AutomationPeer peer = uie.GetAutomationPeer(); if(peer != null) peer.InvalidatePeer(); } //********************************************************************** #endregion IsEnabled Property //********************************************************************* //********************************************************************** #region IsHitTestVisible Property //********************************************************************** ////// The DependencyProperty for the IsHitTestVisible property. /// public static readonly DependencyProperty IsHitTestVisibleProperty = UIElement.IsHitTestVisibleProperty.AddOwner( typeof(UIElement3D), new UIPropertyMetadata( BooleanBoxes.TrueBox, // default value new PropertyChangedCallback(OnIsHitTestVisibleChanged), new CoerceValueCallback(CoerceIsHitTestVisible))); ////// A property indicating if this element is hit test visible or not. /// public bool IsHitTestVisible { get { return (bool) GetValue(IsHitTestVisibleProperty); } set { SetValue(IsHitTestVisibleProperty, BooleanBoxes.Box(value)); } } ////// IsHitTestVisibleChanged event /// public event DependencyPropertyChangedEventHandler IsHitTestVisibleChanged { add {EventHandlersStoreAdd(IsHitTestVisibleChangedKey, value);} remove {EventHandlersStoreRemove(IsHitTestVisibleChangedKey, value);} } internal static readonly EventPrivateKey IsHitTestVisibleChangedKey = new EventPrivateKey(); // Used by ContentElement private static object CoerceIsHitTestVisible(DependencyObject d, object value) { UIElement3D uie = (UIElement3D) d; // We must be false if our parent is false, but we can be // either true or false if our parent is true. // // Another way of saying this is that we can only be true // if our parent is true, but we can always be false. if((bool) value) { // Our parent can constrain us. We can be plugged into either // a "visual" or "content" tree. If we are plugged into a // "content" tree, the visual tree is just considered a // visual representation, and is normally composed of raw // visuals, not UIElements, so we prefer the content tree. // // The content tree uses the "logical" links. But not all // "logical" links lead to a content tree. // // However, ContentElements don't understand IsHitTestVisible, // so we ignore them. // DependencyObject parent = InputElement.GetContainingUIElement(uie.InternalVisualParent); if (parent == null || UIElementHelper.IsHitTestVisible(parent)) { return BooleanBoxes.TrueBox; } else { return BooleanBoxes.FalseBox; } } else { return BooleanBoxes.FalseBox; } } private static void OnIsHitTestVisibleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement3D uie = (UIElement3D)d; // Raise the public changed event. uie.RaiseDependencyPropertyChanged(IsHitTestVisibleChangedKey, e); // Invalidate the children so that they will inherit the new value. InvalidateForceInheritPropertyOnChildren(uie, e.Property); // The input manager needs to re-hittest because something changed // that is involved in the hit-testing we do, so a different result // could be returned. InputManager.SafeCurrentNotifyHitTestInvalidated(); } //********************************************************************* #endregion IsHitTestVisible Property //********************************************************************** //********************************************************************* #region IsVisible Property //********************************************************************* // both _isVisibleMetadata and IsVisibileProperty are constructed in UIElement3D's static constructor private static PropertyMetadata _isVisibleMetadata; ////// The DependencyProperty for the IsVisible property. /// public static readonly DependencyProperty IsVisibleProperty; ////// A property indicating if this element is Visible or not. /// public bool IsVisible { get { return ReadFlag(CoreFlags.IsVisibleCache); } } private static object GetIsVisible(DependencyObject d, out BaseValueSourceInternal source) { source = BaseValueSourceInternal.Local; return ((UIElement3D)d).IsVisible ? BooleanBoxes.TrueBox : BooleanBoxes.FalseBox; } ////// IsVisibleChanged event /// public event DependencyPropertyChangedEventHandler IsVisibleChanged { add {EventHandlersStoreAdd(UIElement.IsVisibleChangedKey, value);} remove {EventHandlersStoreRemove(UIElement.IsVisibleChangedKey, value);} } internal static readonly EventPrivateKey IsVisibleChangedKey = new EventPrivateKey(); // Used by ContentElement ////// Critical - Calls a critical method (PresentationSource.CriticalFromVisual) /// TreatAsSafe - No exposure /// [SecurityCritical, SecurityTreatAsSafe] internal void UpdateIsVisibleCache() // Called from PresentationSource { // IsVisible is a read-only property. It derives its "base" value // from the Visibility property. bool isVisible = (Visibility == Visibility.Visible); // We must be false if our parent is false, but we can be // either true or false if our parent is true. // // Another way of saying this is that we can only be true // if our parent is true, but we can always be false. if(isVisible) { bool constraintAllowsVisible = false; // Our parent can constrain us. We can be plugged into either // a "visual" or "content" tree. If we are plugged into a // "content" tree, the visual tree is just considered a // visual representation, and is normally composed of raw // visuals, not UIElements, so we prefer the content tree. // // The content tree uses the "logical" links. But not all // "logical" links lead to a content tree. // // However, ContentElements don't understand IsVisible, // so we ignore them. // DependencyObject parent = InputElement.GetContainingUIElement(InternalVisualParent); if(parent != null) { constraintAllowsVisible = UIElementHelper.IsVisible(parent); } else { // We cannot be visible if we have no visual parent, unless: // 1) We are the root, connected to a PresentationHost. PresentationSource presentationSource = PresentationSource.CriticalFromVisual(this); if(presentationSource != null) { constraintAllowsVisible = true; } else { // CODE } } if(!constraintAllowsVisible) { isVisible = false; } } if(isVisible != IsVisible) { // Our IsVisible force-inherited property has changed. Update our // cache and raise a change notification. WriteFlag(CoreFlags.IsVisibleCache, isVisible); NotifyPropertyChange(new DependencyPropertyChangedEventArgs(IsVisibleProperty, _isVisibleMetadata, !isVisible, isVisible)); } } private static void OnIsVisibleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement3D uie = (UIElement3D) d; // Raise the public changed event. uie.RaiseDependencyPropertyChanged(IsVisibleChangedKey, e); // Invalidate the children so that they will inherit the new value. InvalidateForceInheritPropertyOnChildren(uie, e.Property); // The input manager needs to re-hittest because something changed // that is involved in the hit-testing we do, so a different result // could be returned. InputManager.SafeCurrentNotifyHitTestInvalidated(); } //********************************************************************* #endregion IsVisible Property //********************************************************************** //********************************************************************* #region Focusable Property //********************************************************************** ////// The DependencyProperty for the Focusable property. /// [CommonDependencyProperty] public static readonly DependencyProperty FocusableProperty = UIElement.FocusableProperty.AddOwner( typeof(UIElement3D), new UIPropertyMetadata( BooleanBoxes.FalseBox, // default value new PropertyChangedCallback(OnFocusableChanged))); ////// Gettor and Settor for Focusable Property /// public bool Focusable { get { return (bool) GetValue(FocusableProperty); } set { SetValue(FocusableProperty, BooleanBoxes.Box(value)); } } ////// FocusableChanged event /// public event DependencyPropertyChangedEventHandler FocusableChanged { add {EventHandlersStoreAdd(UIElement.FocusableChangedKey, value);} remove {EventHandlersStoreRemove(UIElement.FocusableChangedKey, value);} } private static void OnFocusableChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement3D uie = (UIElement3D) d; // Raise the public changed event. uie.RaiseDependencyPropertyChanged(UIElement.FocusableChangedKey, e); } //********************************************************************** #endregion Focusable Property //********************************************************************* ////// Called by the Automation infrastructure when AutomationPeer /// is requested for this element. The element can return null or /// the instance of AutomationPeer-derived clas, if it supports UI Automation /// protected virtual AutomationPeer OnCreateAutomationPeer() { return null; } ////// Called by the Automation infrastructure or Control author /// to make sure the AutomationPeer is created. The element may /// create AP or return null, depending on OnCreateAutomationPeer override. /// internal AutomationPeer CreateAutomationPeer() { VerifyAccess(); //this will ensure the AP is created in the right context AutomationPeer ap = null; if(HasAutomationPeer) { ap = AutomationPeerField.GetValue(this); } else { ap = OnCreateAutomationPeer(); if(ap != null) { AutomationPeerField.SetValue(this, ap); HasAutomationPeer = true; } } return ap; } ////// Returns AutomationPeer if one exists. /// The AutomationPeer may not exist if not yet created by Automation infrastructure /// or if this element is not supposed to have one. /// internal AutomationPeer GetAutomationPeer() { VerifyAccess(); if(HasAutomationPeer) return AutomationPeerField.GetValue(this); return null; } // Helper method to retrieve and fire Clr Event handlers for DependencyPropertyChanged event private void RaiseDependencyPropertyChanged(EventPrivateKey key, DependencyPropertyChangedEventArgs args) { EventHandlersStore store = EventHandlersStore; if (store != null) { Delegate handler = store.Get(key); if (handler != null) { ((DependencyPropertyChangedEventHandler)handler)(this, args); } } } // Cache for the Visibility property. Storage is in Visual._nodeProperties. private Visibility VisibilityCache { get { if (CheckFlagsAnd(VisualFlags.VisibilityCache_Visible)) { return Visibility.Visible; } else if (CheckFlagsAnd(VisualFlags.VisibilityCache_TakesSpace)) { return Visibility.Hidden; } else { return Visibility.Collapsed; } } set { Debug.Assert(value == Visibility.Visible || value == Visibility.Hidden || value == Visibility.Collapsed); switch (value) { case Visibility.Visible: SetFlags(true, VisualFlags.VisibilityCache_Visible); SetFlags(false, VisualFlags.VisibilityCache_TakesSpace); break; case Visibility.Hidden: SetFlags(false, VisualFlags.VisibilityCache_Visible); SetFlags(true, VisualFlags.VisibilityCache_TakesSpace); break; case Visibility.Collapsed: SetFlags(false, VisualFlags.VisibilityCache_Visible); SetFlags(false, VisualFlags.VisibilityCache_TakesSpace); break; } } } #region ForceInherit property support // This is called from the force-inherit property changed events. internal static void InvalidateForceInheritPropertyOnChildren(Visual3D v, DependencyProperty property) { int cChildren = v.InternalVisual2DOr3DChildrenCount; for(int iChild = 0; iChild < cChildren; iChild++) { DependencyObject vChild = v.InternalGet2DOr3DVisualChild(iChild); if(vChild != null) { UIElement element = vChild as UIElement; UIElement3D element3D = vChild as UIElement3D; if(element3D != null) { if(property == IsVisibleProperty) { // For Read-Only force-inherited properties, use // a private update method. element3D.UpdateIsVisibleCache(); } else { // For Read/Write force-inherited properties, use // the standard coersion pattern. element3D.CoerceValue(property); } } else if (element != null) { if(property == IsVisibleProperty) { // For Read-Only force-inherited properties, use // a private update method. element.UpdateIsVisibleCache(); } else { // For Read/Write force-inherited properties, use // the standard coersion pattern. element.CoerceValue(property); } } else { // We have to "walk through" non-UIElement visuals. if (vChild is Visual) { UIElement.InvalidateForceInheritPropertyOnChildren((Visual)vChild, property); } else { InvalidateForceInheritPropertyOnChildren((Visual3D)vChild, property); } } } } } #endregion //------------------------------------------------------ // // Private Fields // //----------------------------------------------------- #region Private Fields private readonly Visual3DCollection _children; private bool _renderRequestPosted; #endregion Private Fields // Perf analysis showed we were not using these fields enough to warrant // bloating each instance with the field, so storage is created on-demand // in the local store. internal static readonly UncommonFieldEventHandlersStoreField = new UncommonField (); internal static readonly UncommonField InputBindingCollectionField = new UncommonField (); internal static readonly UncommonField CommandBindingCollectionField = new UncommonField (); private static readonly UncommonField AutomationPeerField = new UncommonField (); private bool HasAutomationPeer { get { return ReadFlag(CoreFlags.HasAutomationPeer); } set { WriteFlag(CoreFlags.HasAutomationPeer, value); } } internal static readonly FocusWithinProperty FocusWithinProperty = new FocusWithinProperty(); internal static readonly MouseOverProperty MouseOverProperty = new MouseOverProperty(); internal static readonly MouseCaptureWithinProperty MouseCaptureWithinProperty = new MouseCaptureWithinProperty(); internal static readonly StylusOverProperty StylusOverProperty = new StylusOverProperty(); internal static readonly StylusCaptureWithinProperty StylusCaptureWithinProperty = new StylusCaptureWithinProperty(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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