Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Automation / ElementUtil.cs / 1305600 / ElementUtil.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description:
//
// History:
// 07/16/2003 : BrendanM Ported to WCP
//
//---------------------------------------------------------------------------
using System;
using System.Windows.Threading;
using System.Threading;
using System.Windows;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;
using System.Security;
using MS.Win32;
using MS.Internal.Media;
using System.Runtime.InteropServices;
using System.Globalization;
using MS.Internal.PresentationCore; // SafeSecurityHelper
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.Automation
{
// static class providing utility information for working with WCP elements
internal class ElementUtil
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// static class, so use private ctor
private ElementUtil() { }
#endregion Constructors
//------------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal static Visual GetParent( Visual el )
{
return VisualTreeHelper.GetParent(el) as Visual;
}
internal static Visual GetFirstChild( Visual el )
{
if (el == null)
{
return null;
}
return FindVisibleSibling ( el, 0, true );
}
internal static Visual GetLastChild( Visual el )
{
if (el == null)
{
return null;
}
return FindVisibleSibling ( el, el.InternalVisualChildrenCount - 1, false );
}
// Warning: Method is O(N). See FindVisibleSibling function for more information.
internal static Visual GetNextSibling( Visual el )
{
// To get next/previous sibling, have to find out where we
// are in our parent's children collection (ie. our siblings)
Visual parent = VisualTreeHelper.GetParent(el) as Visual;
// If parent is null, we're at root, so have no siblings
if (parent == null)
{
return null;
}
return FindVisibleSibling ( parent, el, true /* Next */);
}
// Warning: Method is O(N). See FindVisibleSibling function for more information.
internal static Visual GetPreviousSibling( Visual el )
{
// To get next/previous sibling, have to find out where we
// are in our parent's children collection (ie. our siblings)
Visual parent = VisualTreeHelper.GetParent(el) as Visual;
// If parent is null, we're at root, so have no siblings
if (parent == null)
{
return null;
}
return FindVisibleSibling ( parent, el, false /* Previous */);
}
internal static Visual GetRoot( Visual el )
{
// Keep moving up parent chain till we reach the top...
Visual scan = el;
for( ; ; )
{
Visual test = VisualTreeHelper.GetParent(scan) as Visual;
if( test == null )
break;
scan = test;
}
return scan;
}
// Get bounding rectangle, in coords relative to root (not screen)
internal static Rect GetLocalRect( UIElement element )
{
// Get top-most visual.
Visual parent = GetRoot( element );
// Get the points for the rectangle and transform them.
double height = element.RenderSize.Height;
double width = element.RenderSize.Width;
Rect rect = new Rect(0, 0, width, height);
GeneralTransform g = element.TransformToAncestor(parent);
return g.TransformBounds(rect);
}
// Get bounding rectangle, relative to screen
internal static Rect GetScreenRect( IntPtr hwnd, UIElement el )
{
Rect rc = GetLocalRect( el );
// Map from local to screen coords...
NativeMethods.RECT rcWin32 = new NativeMethods.RECT( (int) rc.Left, (int) rc.Top, (int) rc.Right, (int) rc.Bottom );
try
{
SafeSecurityHelper.TransformLocalRectToScreen(new HandleRef(null, hwnd), ref rcWin32);
}
catch (System.ComponentModel.Win32Exception)
{
return Rect.Empty;
}
rc = new Rect( rcWin32.left, rcWin32.top, rcWin32.right - rcWin32.left, rcWin32.bottom - rcWin32.top );
return rc;
}
// Get element at given point (screen coords)
///
/// Critical - accepts critical data. Hwnd was created under an elevation.
/// - calls HwndSource.CriticalFromHwnd to get the HwndSource for this visual
/// TreatAsSafe - returning an element is considered safe.
/// - the hwndSource is not exposed.
///
[SecurityCritical, SecurityTreatAsSafe ]
internal static Visual GetElementFromPoint( IntPtr hwnd, Visual root, Point pointScreen )
{
HwndSource hwndSource = HwndSource.CriticalFromHwnd(hwnd);
if(hwndSource == null)
return null;
Point pointClient = PointUtil.ScreenToClient( pointScreen, hwndSource );
Point pointRoot = PointUtil.ClientToRoot(pointClient, hwndSource);
PointHitTestResult result = VisualTreeUtils.AsNearestPointHitTestResult(VisualTreeHelper.HitTest(root, pointRoot));
Visual visual = (result != null) ? result.VisualHit : null;
return visual;
}
// Ensures that an element is enabled; throws exception otherwise
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal static void CheckEnabled(Visual visual)
{
UIElement el = visual as UIElement;
if( el != null && ! el.IsEnabled )
{
throw new ElementNotEnabledException();
}
}
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal static object Invoke(AutomationPeer peer, DispatcherOperationCallback work, object arg)
{
Dispatcher dispatcher = peer.Dispatcher;
// Null dispatcher likely means the visual is in bad shape!
if( dispatcher == null )
{
throw new ElementNotAvailableException();
}
Exception remoteException = null;
bool completed = false;
object retVal = dispatcher.Invoke(
DispatcherPriority.Send,
TimeSpan.FromMinutes(3),
(DispatcherOperationCallback) delegate(object unused)
{
try
{
return work(arg);
}
catch(Exception e)
{
remoteException = e;
return null;
}
catch //for non-CLS Compliant exceptions
{
remoteException = null;
return null;
}
finally
{
completed = true;
}
},
null);
if(completed)
{
if(remoteException != null)
{
throw remoteException;
}
}
else
{
bool dispatcherInShutdown = dispatcher.HasShutdownStarted;
if(dispatcherInShutdown)
{
throw new InvalidOperationException(SR.Get(SRID.AutomationDispatcherShutdown));
}
else
{
throw new TimeoutException(SR.Get(SRID.AutomationTimeout));
}
}
return retVal;
}
#endregion Internal Methods
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
//
private static Visual FindVisibleSibling ( Visual parent, int start, bool searchForwards)
{
int index = start;
int childrenCount = parent.InternalVisualChildrenCount;
while ( index >= 0 && index < childrenCount )
{
Visual sibling = parent.InternalGetVisualChild(index);
// if its visible or something other than a UIElement keep it
if ( !(sibling is UIElement) || (((UIElement)sibling).Visibility == Visibility.Visible ) )
return sibling;
index += searchForwards ? 1 : -1;
}
return null;
}
//
private static Visual FindVisibleSibling(Visual parent, Visual child, bool searchForwards)
{
//
// First we figure out the index of the specified child Visual. This is why the runtime
// of this method is O(n).
int childrenCount = parent.InternalVisualChildrenCount;
int childIndex;
for (childIndex = 0; childIndex < childrenCount; childIndex++)
{
Visual current = parent.InternalGetVisualChild(childIndex);
if (current == child)
{
// Found the child.
break;
}
}
//
// Now that we have the child index, we can go and lookup the sibling.
if(searchForwards)
return FindVisibleSibling(parent, childIndex+1, searchForwards); // (FindVisibleSibling can deal with out of range indices).
else
return FindVisibleSibling(parent, childIndex-1, searchForwards); // (FindVisibleSibling can deal with out of range indices).
}
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// static class, so no private fields
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description:
//
// History:
// 07/16/2003 : BrendanM Ported to WCP
//
//---------------------------------------------------------------------------
using System;
using System.Windows.Threading;
using System.Threading;
using System.Windows;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;
using System.Security;
using MS.Win32;
using MS.Internal.Media;
using System.Runtime.InteropServices;
using System.Globalization;
using MS.Internal.PresentationCore; // SafeSecurityHelper
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.Automation
{
// static class providing utility information for working with WCP elements
internal class ElementUtil
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// static class, so use private ctor
private ElementUtil() { }
#endregion Constructors
//------------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal static Visual GetParent( Visual el )
{
return VisualTreeHelper.GetParent(el) as Visual;
}
internal static Visual GetFirstChild( Visual el )
{
if (el == null)
{
return null;
}
return FindVisibleSibling ( el, 0, true );
}
internal static Visual GetLastChild( Visual el )
{
if (el == null)
{
return null;
}
return FindVisibleSibling ( el, el.InternalVisualChildrenCount - 1, false );
}
// Warning: Method is O(N). See FindVisibleSibling function for more information.
internal static Visual GetNextSibling( Visual el )
{
// To get next/previous sibling, have to find out where we
// are in our parent's children collection (ie. our siblings)
Visual parent = VisualTreeHelper.GetParent(el) as Visual;
// If parent is null, we're at root, so have no siblings
if (parent == null)
{
return null;
}
return FindVisibleSibling ( parent, el, true /* Next */);
}
// Warning: Method is O(N). See FindVisibleSibling function for more information.
internal static Visual GetPreviousSibling( Visual el )
{
// To get next/previous sibling, have to find out where we
// are in our parent's children collection (ie. our siblings)
Visual parent = VisualTreeHelper.GetParent(el) as Visual;
// If parent is null, we're at root, so have no siblings
if (parent == null)
{
return null;
}
return FindVisibleSibling ( parent, el, false /* Previous */);
}
internal static Visual GetRoot( Visual el )
{
// Keep moving up parent chain till we reach the top...
Visual scan = el;
for( ; ; )
{
Visual test = VisualTreeHelper.GetParent(scan) as Visual;
if( test == null )
break;
scan = test;
}
return scan;
}
// Get bounding rectangle, in coords relative to root (not screen)
internal static Rect GetLocalRect( UIElement element )
{
// Get top-most visual.
Visual parent = GetRoot( element );
// Get the points for the rectangle and transform them.
double height = element.RenderSize.Height;
double width = element.RenderSize.Width;
Rect rect = new Rect(0, 0, width, height);
GeneralTransform g = element.TransformToAncestor(parent);
return g.TransformBounds(rect);
}
// Get bounding rectangle, relative to screen
internal static Rect GetScreenRect( IntPtr hwnd, UIElement el )
{
Rect rc = GetLocalRect( el );
// Map from local to screen coords...
NativeMethods.RECT rcWin32 = new NativeMethods.RECT( (int) rc.Left, (int) rc.Top, (int) rc.Right, (int) rc.Bottom );
try
{
SafeSecurityHelper.TransformLocalRectToScreen(new HandleRef(null, hwnd), ref rcWin32);
}
catch (System.ComponentModel.Win32Exception)
{
return Rect.Empty;
}
rc = new Rect( rcWin32.left, rcWin32.top, rcWin32.right - rcWin32.left, rcWin32.bottom - rcWin32.top );
return rc;
}
// Get element at given point (screen coords)
///
/// Critical - accepts critical data. Hwnd was created under an elevation.
/// - calls HwndSource.CriticalFromHwnd to get the HwndSource for this visual
/// TreatAsSafe - returning an element is considered safe.
/// - the hwndSource is not exposed.
///
[SecurityCritical, SecurityTreatAsSafe ]
internal static Visual GetElementFromPoint( IntPtr hwnd, Visual root, Point pointScreen )
{
HwndSource hwndSource = HwndSource.CriticalFromHwnd(hwnd);
if(hwndSource == null)
return null;
Point pointClient = PointUtil.ScreenToClient( pointScreen, hwndSource );
Point pointRoot = PointUtil.ClientToRoot(pointClient, hwndSource);
PointHitTestResult result = VisualTreeUtils.AsNearestPointHitTestResult(VisualTreeHelper.HitTest(root, pointRoot));
Visual visual = (result != null) ? result.VisualHit : null;
return visual;
}
// Ensures that an element is enabled; throws exception otherwise
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal static void CheckEnabled(Visual visual)
{
UIElement el = visual as UIElement;
if( el != null && ! el.IsEnabled )
{
throw new ElementNotEnabledException();
}
}
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal static object Invoke(AutomationPeer peer, DispatcherOperationCallback work, object arg)
{
Dispatcher dispatcher = peer.Dispatcher;
// Null dispatcher likely means the visual is in bad shape!
if( dispatcher == null )
{
throw new ElementNotAvailableException();
}
Exception remoteException = null;
bool completed = false;
object retVal = dispatcher.Invoke(
DispatcherPriority.Send,
TimeSpan.FromMinutes(3),
(DispatcherOperationCallback) delegate(object unused)
{
try
{
return work(arg);
}
catch(Exception e)
{
remoteException = e;
return null;
}
catch //for non-CLS Compliant exceptions
{
remoteException = null;
return null;
}
finally
{
completed = true;
}
},
null);
if(completed)
{
if(remoteException != null)
{
throw remoteException;
}
}
else
{
bool dispatcherInShutdown = dispatcher.HasShutdownStarted;
if(dispatcherInShutdown)
{
throw new InvalidOperationException(SR.Get(SRID.AutomationDispatcherShutdown));
}
else
{
throw new TimeoutException(SR.Get(SRID.AutomationTimeout));
}
}
return retVal;
}
#endregion Internal Methods
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
//
private static Visual FindVisibleSibling ( Visual parent, int start, bool searchForwards)
{
int index = start;
int childrenCount = parent.InternalVisualChildrenCount;
while ( index >= 0 && index < childrenCount )
{
Visual sibling = parent.InternalGetVisualChild(index);
// if its visible or something other than a UIElement keep it
if ( !(sibling is UIElement) || (((UIElement)sibling).Visibility == Visibility.Visible ) )
return sibling;
index += searchForwards ? 1 : -1;
}
return null;
}
//
private static Visual FindVisibleSibling(Visual parent, Visual child, bool searchForwards)
{
//
// First we figure out the index of the specified child Visual. This is why the runtime
// of this method is O(n).
int childrenCount = parent.InternalVisualChildrenCount;
int childIndex;
for (childIndex = 0; childIndex < childrenCount; childIndex++)
{
Visual current = parent.InternalGetVisualChild(childIndex);
if (current == child)
{
// Found the child.
break;
}
}
//
// Now that we have the child index, we can go and lookup the sibling.
if(searchForwards)
return FindVisibleSibling(parent, childIndex+1, searchForwards); // (FindVisibleSibling can deal with out of range indices).
else
return FindVisibleSibling(parent, childIndex-1, searchForwards); // (FindVisibleSibling can deal with out of range indices).
}
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// static class, so no private fields
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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