Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / UIAutomation / Win32Providers / MS / Internal / AutomationProxies / ProxyHwnd.cs / 1 / ProxyHwnd.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: Base class for all the Win32 and office Controls.
//
//
// Only true ROOT object should derive from this class
// NOTE: In the case when ProxyHwnd.ElementProviderFromPoint
// returns provider of type ProxyFragment we MUST do the further drilling ourselves
// since UIAutomation will not (and correctly!!!) do it. (see ProxyFragment's
// comments on how to implement this and WindowsListView.cs for example)
//
// Class ProxyHwnd: ProxyFragment, IRawElementProviderAdviseEvents
// AdviseEventAdded
// AdviseEventRemoved
//
//
//
// History:
// 07/01/2003 : a-jeanp Created
// 08/21/03: alexsn Class explanations
//
//---------------------------------------------------------------------------
// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
using System;
using System.Text;
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Collections;
using System.Collections.Specialized;
using System.Runtime.InteropServices;
using System.Globalization;
using System.ComponentModel;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
#region ProxyHwnd
// Base Class for all the Windows Control that handle context.
// Implements the default behavior
class ProxyHwnd : ProxyFragment, IRawElementProviderAdviseEvents
{
// -----------------------------------------------------
//
// Constructors
//
// -----------------------------------------------------
#region Constructors
internal ProxyHwnd (IntPtr hwnd, ProxyFragment parent, int item)
: base (hwnd, parent, item)
{
}
#endregion
//------------------------------------------------------
//
// Patterns Implementation
//
//-----------------------------------------------------
#region ProxyHwnd Methods
// ------------------------------------------------------
//
// Internal Methods
//
// ------------------------------------------------------
// Advises proxy that an event has been added.
// Maps the Automation Events into WinEvents and add those to the list of WinEvents notification hooks
internal virtual void AdviseEventAdded (AutomationEvent eventId, AutomationProperty [] aidProps)
{
// No RawElementBase creation callback, exit from here
if (_createOnEvent == null)
{
return;
}
int cEvents = 0;
WinEventTracker.EvtIdProperty [] aEvents;
// Gets an Array of WinEvents to trap on a per window handle basis
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
aEvents = PropertyToWinEvent (aidProps, out cEvents);
}
else
{
aEvents = EventToWinEvent (eventId, out cEvents);
}
// If we have WinEvents to trap, add those to the list of WinEvent
// notification list
if (cEvents > 0)
{
WinEventTracker.AddToNotificationList (_hwnd, _createOnEvent, aEvents, cEvents);
}
}
// Advises proxy that an event has been removed.
internal virtual void AdviseEventRemoved(AutomationEvent eventId, AutomationProperty [] aidProps)
{
// No RawElementBase creation callback, exit from here
if (_createOnEvent == null)
{
return;
}
int cEvents;
WinEventTracker.EvtIdProperty [] aEvents;
// Gets an Array of WinEvents to trap on a per window handle basis
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
aEvents = PropertyToWinEvent (aidProps, out cEvents);
}
else
{
aEvents = EventToWinEvent (eventId, out cEvents);
}
// If we have WinEvents to remove, remive those to the list of WinEvent
// notification list
if (cEvents > 0)
{
WinEventTracker.RemoveToNotificationList (_hwnd, aEvents, null, cEvents);
}
}
// Returns a proxy element corresponding to the specified screen coordinates.
// For an hwnd element, the default behavior is to let UIAutomation do the work.
internal override ProxySimple ElementProviderFromPoint (int x, int y)
{
// Optimisation. If the point is within the client area return this, otherwise it could the the
// non client area. It would be better to return null all the time but this will lead to
// object to be created twice.
return PtInClientRect (_hwnd, x, y) ? this : null;
}
internal override string GetAccessKey()
{
string accessKey = base.GetAccessKey();
if ((bool)GetElementProperty(AutomationElement.IsKeyboardFocusableProperty))
{
if (string.IsNullOrEmpty(accessKey))
{
accessKey = GetLabelAccessKey(_hwnd);
}
}
return accessKey;
}
// Process all the Element Properties
internal override object GetElementProperty (AutomationProperty idProp)
{
// if the hwnd is a winform, then return the Winform id otherwise let
// UIAutomation do the job
if (idProp == AutomationElement.AutomationIdProperty)
{
// Winforms have a special way to obtain the id
if (WindowsFormsHelper.IsWindowsFormsControl(_hwnd, ref _windowsForms))
{
string sPersistentID = WindowsFormsHelper.WindowsFormsID (_hwnd);
return string.IsNullOrEmpty(sPersistentID) ? null : sPersistentID;
}
}
else if (idProp == AutomationElement.NameProperty)
{
string name;
// If this is a winforms control and the AccessibleName is set, use it.
if (WindowsFormsHelper.IsWindowsFormsControl(_hwnd, ref _windowsForms))
{
name = GetAccessibleName(NativeMethods.CHILD_SELF);
if (!string.IsNullOrEmpty(name))
{
return name;
}
}
// Only hwnd's can be labeled.
name = LocalizedName;
// PerSharp/PreFast will flag this as a warning 6507/56507: Prefer 'string.IsNullOrEmpty(name)' over checks for null and/or emptiness.
// It is valid to set LocalizedName to an empty string. LocalizedName being an
// empty string will prevent the SendMessage(WM_GETTEXT) call.
#pragma warning suppress 6507
if (name == null && GetParent() == null)
{
if (_fControlHasLabel)
{
IntPtr label = Misc.GetLabelhwnd(_hwnd);
name = Misc.GetControlName(label, true);
if (!string.IsNullOrEmpty(name))
{
_controlLabel = label;
}
}
else
{
name = Misc.ProxyGetText(_hwnd);
}
}
// If name is still null, and we have an IAccessible, try it:
// this picks up names on HWNDs set through Dynamic Annotation
// (eg. on the richedits in Windows Mail), and holds us over till
// we add DA support to UIA properly.
if (String.IsNullOrEmpty(name))
{
name = GetAccessibleName(NativeMethods.CHILD_SELF);
}
return name;
}
// Only hwnd's can be labeled.
else if (idProp == AutomationElement.LabeledByProperty && _fControlHasLabel)
{
// This is called to make sure that _controlLabel gets set.
object name = GetElementProperty(AutomationElement.NameProperty);
// If a control has a LocalizedName, the _controlLabel will not get set.
// So look for it now.
if (_controlLabel == IntPtr.Zero && name != null && GetParent() == null)
{
_controlLabel = Misc.GetLabelhwnd(_hwnd);
}
// If we have a cached _controlLabel that means that the name property we just got
// was retreived from the label of the control and not its text or something else. If this
// is the case expose it as the label.
if (_controlLabel != IntPtr.Zero)
{
return AutomationInteropProvider.HostProviderFromHandle(_controlLabel);
}
}
else if (idProp == AutomationElement.IsOffscreenProperty)
{
if (!SafeNativeMethods.IsWindowVisible(_hwnd))
{
return true;
}
IntPtr hwndParent = Misc.GetParent(_hwnd);
// Check if rect is within rect of parent. Don't do this for top-level windows,
// however, since the win32 desktop hwnd claims to have a rect only as large as the
// primary monitor, making hwnds on other monitors seem clipped.
if (hwndParent != IntPtr.Zero && hwndParent != UnsafeNativeMethods.GetDesktopWindow())
{
NativeMethods.Win32Rect parentRect = NativeMethods.Win32Rect.Empty;
if (Misc.GetClientRectInScreenCoordinates(hwndParent, ref parentRect) && !parentRect.IsEmpty)
{
Rect itemRect = BoundingRectangle;
if (!itemRect.IsEmpty && !Misc.IsItemVisible(ref parentRect, ref itemRect))
{
return true;
}
}
}
}
return base.GetElementProperty(idProp);
}
// Gets the controls help text
internal override string HelpText
{
get
{
int idChild = Misc.GetWindowId(_hwnd);
string text = Misc.GetItemToolTipText(_hwnd, IntPtr.Zero, idChild);
if (string.IsNullOrEmpty(text))
{
text = Misc.GetItemToolTipText(_hwnd, IntPtr.Zero, 0);
}
if (string.IsNullOrEmpty(text))
{
Accessible acc = Accessible.Wrap(AccessibleObject);
if (acc != null)
{
text = acc.Description;
}
}
return text;
}
}
#endregion
#region IRawElementProviderAdviseEvents Interface
// -----------------------------------------------------
//
// IRawElementProviderAdviseEvents interface implementation
//
// ------------------------------------------------------
// Advises event sinks that an event has been added.
void IRawElementProviderAdviseEvents.AdviseEventAdded(int eventIdAsInt, int[] propertiesAsInts)
{
AutomationEvent eventId = AutomationEvent.LookupById(eventIdAsInt);
AutomationProperty [] properties = null;
if (propertiesAsInts != null)
{
properties = new AutomationProperty[propertiesAsInts.Length];
for (int i = 0; i < propertiesAsInts.Length; i++)
{
properties[i] = AutomationProperty.LookupById(propertiesAsInts[i]);
}
}
//ProxyHwnd.AdviseEventAdded
AdviseEventAdded (eventId, properties);
}
// Advises event sinks that an event has been removed.
void IRawElementProviderAdviseEvents.AdviseEventRemoved(int eventIdAsInt, int[] propertiesAsInts)
{
AutomationEvent eventId = AutomationEvent.LookupById(eventIdAsInt);
AutomationProperty [] properties = null;
if (propertiesAsInts != null)
{
properties = new AutomationProperty[propertiesAsInts.Length];
for (int i = 0; i < propertiesAsInts.Length; i++)
{
properties[i] = AutomationProperty.LookupById(propertiesAsInts[i]);
}
}
//ProxyHwnd.AdviseEventRemoved
AdviseEventRemoved (eventId, properties);
}
#endregion
// -----------------------------------------------------
//
// Internal Fields
//
// -----------------------------------------------------
#region Internal Fields
// Callback into the Proxy code to create a raw element based on a WinEvent callback parameters
internal WinEventTracker.ProxyRaiseEvents _createOnEvent = null;
#endregion
// -----------------------------------------------------
//
// Protected Methods
//
// ------------------------------------------------------
#region Protected Methods
// Picks a WinEvent to track for a UIA property
protected virtual int [] PropertyToWinEvent (AutomationProperty idProp)
{
if (idProp == AutomationElement.HasKeyboardFocusProperty)
{
return new int [] { NativeMethods.EventObjectFocus };
}
else if (idProp == AutomationElement.NameProperty)
{
return new int[] { NativeMethods.EventObjectNameChange };
}
else if (idProp == ValuePattern.ValueProperty || idProp == RangeValuePattern.ValueProperty)
{
return new int[] { NativeMethods.EventObjectValueChange };
}
else if (idProp == AutomationElement.IsOffscreenProperty)
{
return new int[] { NativeMethods.EventObjectLocationChange };
}
else if (idProp == ExpandCollapsePattern.ExpandCollapseStateProperty)
{
return new int [] { NativeMethods.EventObjectStateChange,
NativeMethods.EventObjectShow,
NativeMethods.EventObjectHide};
}
// Windows sent OBJECT_VALUECHANGE for changes in the scroll bar with the idObject set to the scroll bar id of the originator
else if ((idProp == ScrollPattern.HorizontalScrollPercentProperty ||
idProp == ScrollPattern.VerticalScrollPercentProperty) ||
idProp == ScrollPattern.HorizontalViewSizeProperty ||
idProp == ScrollPattern.VerticalViewSizeProperty )
{
return new int [] { NativeMethods.EventObjectValueChange };
}
else if (idProp == SelectionItemPattern.IsSelectedProperty)
{
return new int [] { NativeMethods.EventObjectSelectionAdd,
NativeMethods.EventObjectSelectionRemove,
NativeMethods.EventObjectSelection};
}
else if (idProp == TogglePattern.ToggleStateProperty)
{
return new int[] { NativeMethods.EventSystemCaptureEnd,
NativeMethods.EventObjectStateChange };
}
return null;
}
// Builds a list of Win32 WinEvents to process a UIAutomation Event.
protected virtual WinEventTracker.EvtIdProperty [] EventToWinEvent (AutomationEvent idEvent, out int cEvent)
{
// Fill this variable with a WinEvent id if found
int idWinEvent = 0;
if (idEvent == SelectionItemPattern.ElementSelectedEvent)
{
cEvent = 2;
return new WinEventTracker.EvtIdProperty[2]
{
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectSelection, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectStateChange, idEvent)
};
}
else if (idEvent == SelectionItemPattern.ElementAddedToSelectionEvent)
{
// For some control, the Event Selection is sent instead of SelectionAdd
// Trap both.
cEvent = 2;
return new WinEventTracker.EvtIdProperty [2]
{
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectSelectionAdd, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectSelection, idEvent)
};
}
else if (idEvent == SelectionItemPattern.ElementRemovedFromSelectionEvent)
{
idWinEvent = NativeMethods.EventObjectSelectionRemove;
}
else if (idEvent == SelectionPattern.InvalidatedEvent)
{
idWinEvent = NativeMethods.EventObjectSelectionWithin;
}
else if (idEvent == InvokePattern.InvokedEvent)
{
cEvent = 4;
return new WinEventTracker.EvtIdProperty[4] {
new WinEventTracker.EvtIdProperty (NativeMethods.EventSystemCaptureEnd, idEvent), // For SysHeaders
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectStateChange, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectValueChange, idEvent), // For WindowsScrollBarBits
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectInvoke, idEvent)
};
}
else if (idEvent == AutomationElement.StructureChangedEvent)
{
cEvent = 3;
return new WinEventTracker.EvtIdProperty[3] {
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectCreate, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectDestroy, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectReorder, idEvent)
};
}
else if (idEvent == TextPattern.TextSelectionChangedEvent)
{
cEvent = 2;
return new WinEventTracker.EvtIdProperty[2] {
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectLocationChange, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectTextSelectionChanged, idEvent)
};
}
else
{
cEvent = 0;
return null;
}
// found one and only one
cEvent = 1;
return new WinEventTracker.EvtIdProperty [1] { new WinEventTracker.EvtIdProperty (idWinEvent, idEvent) };
}
// Check if a point is within the client Rect of a window
static protected bool PtInClientRect (IntPtr hwnd, int x, int y)
{
NativeMethods.Win32Rect rc = new NativeMethods.Win32Rect ();
if (!Misc.GetClientRect(hwnd, ref rc))
{
return false;
}
if (!Misc.MapWindowPoints(hwnd, IntPtr.Zero, ref rc, 2))
{
return false;
}
return x >= rc.left && x < rc.right && y >= rc.top && y < rc.bottom;
}
#endregion
// -----------------------------------------------------
//
// Private Methods
//
// ------------------------------------------------------
#region Private Methods
// Get the access key of the associated label (if there is
// an associated label).
static protected string GetLabelAccessKey(IntPtr hwnd)
{
string accessKey = string.Empty;
IntPtr label = Misc.GetLabelhwnd(hwnd);
if (label != IntPtr.Zero)
{
string labelText = Misc.ProxyGetText(label);
if (!string.IsNullOrEmpty(labelText))
{
accessKey = Misc.AccessKey(labelText);
}
}
return accessKey;
}
// Builds a list of Win32 WinEvents to process changes in properties changes values.
// Returns an array of Events to Set. The number of valid entries in this array is pass back in cEvents
private WinEventTracker.EvtIdProperty [] PropertyToWinEvent (AutomationProperty [] aProps, out int cEvent)
{
ArrayList alEvents = new ArrayList (16);
foreach (AutomationProperty idProp in aProps)
{
int [] evtId = PropertyToWinEvent (idProp);
for (int i = 0; evtId != null && i < evtId.Length; i++)
{
alEvents.Add (new WinEventTracker.EvtIdProperty (evtId [i], idProp));
}
}
WinEventTracker.EvtIdProperty [] aEvtIdProperties = new WinEventTracker.EvtIdProperty [alEvents.Count];
cEvent = alEvents.Count;
for (int i = 0; i < cEvent; i++)
{
aEvtIdProperties [i] = (WinEventTracker.EvtIdProperty) alEvents [i];
}
return aEvtIdProperties;
}
#endregion
// ------------------------------------------------------
//
// Private Fields
//
// -----------------------------------------------------
#region Private Fields
// True if the control has an associated label.
protected bool _fControlHasLabel = true;
// The hwnd of static text that is functioning as a label for a control.
// This is initialized in GetElementProperty for the Name property and
// used by the LabeledBy property.
// If !_fControlHasLabel, _controlLabel will be IntPtr.Zero.
private IntPtr _controlLabel;
#endregion
}
#endregion
}
// 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: Base class for all the Win32 and office Controls.
//
//
// Only true ROOT object should derive from this class
// NOTE: In the case when ProxyHwnd.ElementProviderFromPoint
// returns provider of type ProxyFragment we MUST do the further drilling ourselves
// since UIAutomation will not (and correctly!!!) do it. (see ProxyFragment's
// comments on how to implement this and WindowsListView.cs for example)
//
// Class ProxyHwnd: ProxyFragment, IRawElementProviderAdviseEvents
// AdviseEventAdded
// AdviseEventRemoved
//
//
//
// History:
// 07/01/2003 : a-jeanp Created
// 08/21/03: alexsn Class explanations
//
//---------------------------------------------------------------------------
// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
using System;
using System.Text;
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Collections;
using System.Collections.Specialized;
using System.Runtime.InteropServices;
using System.Globalization;
using System.ComponentModel;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
#region ProxyHwnd
// Base Class for all the Windows Control that handle context.
// Implements the default behavior
class ProxyHwnd : ProxyFragment, IRawElementProviderAdviseEvents
{
// -----------------------------------------------------
//
// Constructors
//
// -----------------------------------------------------
#region Constructors
internal ProxyHwnd (IntPtr hwnd, ProxyFragment parent, int item)
: base (hwnd, parent, item)
{
}
#endregion
//------------------------------------------------------
//
// Patterns Implementation
//
//-----------------------------------------------------
#region ProxyHwnd Methods
// ------------------------------------------------------
//
// Internal Methods
//
// ------------------------------------------------------
// Advises proxy that an event has been added.
// Maps the Automation Events into WinEvents and add those to the list of WinEvents notification hooks
internal virtual void AdviseEventAdded (AutomationEvent eventId, AutomationProperty [] aidProps)
{
// No RawElementBase creation callback, exit from here
if (_createOnEvent == null)
{
return;
}
int cEvents = 0;
WinEventTracker.EvtIdProperty [] aEvents;
// Gets an Array of WinEvents to trap on a per window handle basis
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
aEvents = PropertyToWinEvent (aidProps, out cEvents);
}
else
{
aEvents = EventToWinEvent (eventId, out cEvents);
}
// If we have WinEvents to trap, add those to the list of WinEvent
// notification list
if (cEvents > 0)
{
WinEventTracker.AddToNotificationList (_hwnd, _createOnEvent, aEvents, cEvents);
}
}
// Advises proxy that an event has been removed.
internal virtual void AdviseEventRemoved(AutomationEvent eventId, AutomationProperty [] aidProps)
{
// No RawElementBase creation callback, exit from here
if (_createOnEvent == null)
{
return;
}
int cEvents;
WinEventTracker.EvtIdProperty [] aEvents;
// Gets an Array of WinEvents to trap on a per window handle basis
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
aEvents = PropertyToWinEvent (aidProps, out cEvents);
}
else
{
aEvents = EventToWinEvent (eventId, out cEvents);
}
// If we have WinEvents to remove, remive those to the list of WinEvent
// notification list
if (cEvents > 0)
{
WinEventTracker.RemoveToNotificationList (_hwnd, aEvents, null, cEvents);
}
}
// Returns a proxy element corresponding to the specified screen coordinates.
// For an hwnd element, the default behavior is to let UIAutomation do the work.
internal override ProxySimple ElementProviderFromPoint (int x, int y)
{
// Optimisation. If the point is within the client area return this, otherwise it could the the
// non client area. It would be better to return null all the time but this will lead to
// object to be created twice.
return PtInClientRect (_hwnd, x, y) ? this : null;
}
internal override string GetAccessKey()
{
string accessKey = base.GetAccessKey();
if ((bool)GetElementProperty(AutomationElement.IsKeyboardFocusableProperty))
{
if (string.IsNullOrEmpty(accessKey))
{
accessKey = GetLabelAccessKey(_hwnd);
}
}
return accessKey;
}
// Process all the Element Properties
internal override object GetElementProperty (AutomationProperty idProp)
{
// if the hwnd is a winform, then return the Winform id otherwise let
// UIAutomation do the job
if (idProp == AutomationElement.AutomationIdProperty)
{
// Winforms have a special way to obtain the id
if (WindowsFormsHelper.IsWindowsFormsControl(_hwnd, ref _windowsForms))
{
string sPersistentID = WindowsFormsHelper.WindowsFormsID (_hwnd);
return string.IsNullOrEmpty(sPersistentID) ? null : sPersistentID;
}
}
else if (idProp == AutomationElement.NameProperty)
{
string name;
// If this is a winforms control and the AccessibleName is set, use it.
if (WindowsFormsHelper.IsWindowsFormsControl(_hwnd, ref _windowsForms))
{
name = GetAccessibleName(NativeMethods.CHILD_SELF);
if (!string.IsNullOrEmpty(name))
{
return name;
}
}
// Only hwnd's can be labeled.
name = LocalizedName;
// PerSharp/PreFast will flag this as a warning 6507/56507: Prefer 'string.IsNullOrEmpty(name)' over checks for null and/or emptiness.
// It is valid to set LocalizedName to an empty string. LocalizedName being an
// empty string will prevent the SendMessage(WM_GETTEXT) call.
#pragma warning suppress 6507
if (name == null && GetParent() == null)
{
if (_fControlHasLabel)
{
IntPtr label = Misc.GetLabelhwnd(_hwnd);
name = Misc.GetControlName(label, true);
if (!string.IsNullOrEmpty(name))
{
_controlLabel = label;
}
}
else
{
name = Misc.ProxyGetText(_hwnd);
}
}
// If name is still null, and we have an IAccessible, try it:
// this picks up names on HWNDs set through Dynamic Annotation
// (eg. on the richedits in Windows Mail), and holds us over till
// we add DA support to UIA properly.
if (String.IsNullOrEmpty(name))
{
name = GetAccessibleName(NativeMethods.CHILD_SELF);
}
return name;
}
// Only hwnd's can be labeled.
else if (idProp == AutomationElement.LabeledByProperty && _fControlHasLabel)
{
// This is called to make sure that _controlLabel gets set.
object name = GetElementProperty(AutomationElement.NameProperty);
// If a control has a LocalizedName, the _controlLabel will not get set.
// So look for it now.
if (_controlLabel == IntPtr.Zero && name != null && GetParent() == null)
{
_controlLabel = Misc.GetLabelhwnd(_hwnd);
}
// If we have a cached _controlLabel that means that the name property we just got
// was retreived from the label of the control and not its text or something else. If this
// is the case expose it as the label.
if (_controlLabel != IntPtr.Zero)
{
return AutomationInteropProvider.HostProviderFromHandle(_controlLabel);
}
}
else if (idProp == AutomationElement.IsOffscreenProperty)
{
if (!SafeNativeMethods.IsWindowVisible(_hwnd))
{
return true;
}
IntPtr hwndParent = Misc.GetParent(_hwnd);
// Check if rect is within rect of parent. Don't do this for top-level windows,
// however, since the win32 desktop hwnd claims to have a rect only as large as the
// primary monitor, making hwnds on other monitors seem clipped.
if (hwndParent != IntPtr.Zero && hwndParent != UnsafeNativeMethods.GetDesktopWindow())
{
NativeMethods.Win32Rect parentRect = NativeMethods.Win32Rect.Empty;
if (Misc.GetClientRectInScreenCoordinates(hwndParent, ref parentRect) && !parentRect.IsEmpty)
{
Rect itemRect = BoundingRectangle;
if (!itemRect.IsEmpty && !Misc.IsItemVisible(ref parentRect, ref itemRect))
{
return true;
}
}
}
}
return base.GetElementProperty(idProp);
}
// Gets the controls help text
internal override string HelpText
{
get
{
int idChild = Misc.GetWindowId(_hwnd);
string text = Misc.GetItemToolTipText(_hwnd, IntPtr.Zero, idChild);
if (string.IsNullOrEmpty(text))
{
text = Misc.GetItemToolTipText(_hwnd, IntPtr.Zero, 0);
}
if (string.IsNullOrEmpty(text))
{
Accessible acc = Accessible.Wrap(AccessibleObject);
if (acc != null)
{
text = acc.Description;
}
}
return text;
}
}
#endregion
#region IRawElementProviderAdviseEvents Interface
// -----------------------------------------------------
//
// IRawElementProviderAdviseEvents interface implementation
//
// ------------------------------------------------------
// Advises event sinks that an event has been added.
void IRawElementProviderAdviseEvents.AdviseEventAdded(int eventIdAsInt, int[] propertiesAsInts)
{
AutomationEvent eventId = AutomationEvent.LookupById(eventIdAsInt);
AutomationProperty [] properties = null;
if (propertiesAsInts != null)
{
properties = new AutomationProperty[propertiesAsInts.Length];
for (int i = 0; i < propertiesAsInts.Length; i++)
{
properties[i] = AutomationProperty.LookupById(propertiesAsInts[i]);
}
}
//ProxyHwnd.AdviseEventAdded
AdviseEventAdded (eventId, properties);
}
// Advises event sinks that an event has been removed.
void IRawElementProviderAdviseEvents.AdviseEventRemoved(int eventIdAsInt, int[] propertiesAsInts)
{
AutomationEvent eventId = AutomationEvent.LookupById(eventIdAsInt);
AutomationProperty [] properties = null;
if (propertiesAsInts != null)
{
properties = new AutomationProperty[propertiesAsInts.Length];
for (int i = 0; i < propertiesAsInts.Length; i++)
{
properties[i] = AutomationProperty.LookupById(propertiesAsInts[i]);
}
}
//ProxyHwnd.AdviseEventRemoved
AdviseEventRemoved (eventId, properties);
}
#endregion
// -----------------------------------------------------
//
// Internal Fields
//
// -----------------------------------------------------
#region Internal Fields
// Callback into the Proxy code to create a raw element based on a WinEvent callback parameters
internal WinEventTracker.ProxyRaiseEvents _createOnEvent = null;
#endregion
// -----------------------------------------------------
//
// Protected Methods
//
// ------------------------------------------------------
#region Protected Methods
// Picks a WinEvent to track for a UIA property
protected virtual int [] PropertyToWinEvent (AutomationProperty idProp)
{
if (idProp == AutomationElement.HasKeyboardFocusProperty)
{
return new int [] { NativeMethods.EventObjectFocus };
}
else if (idProp == AutomationElement.NameProperty)
{
return new int[] { NativeMethods.EventObjectNameChange };
}
else if (idProp == ValuePattern.ValueProperty || idProp == RangeValuePattern.ValueProperty)
{
return new int[] { NativeMethods.EventObjectValueChange };
}
else if (idProp == AutomationElement.IsOffscreenProperty)
{
return new int[] { NativeMethods.EventObjectLocationChange };
}
else if (idProp == ExpandCollapsePattern.ExpandCollapseStateProperty)
{
return new int [] { NativeMethods.EventObjectStateChange,
NativeMethods.EventObjectShow,
NativeMethods.EventObjectHide};
}
// Windows sent OBJECT_VALUECHANGE for changes in the scroll bar with the idObject set to the scroll bar id of the originator
else if ((idProp == ScrollPattern.HorizontalScrollPercentProperty ||
idProp == ScrollPattern.VerticalScrollPercentProperty) ||
idProp == ScrollPattern.HorizontalViewSizeProperty ||
idProp == ScrollPattern.VerticalViewSizeProperty )
{
return new int [] { NativeMethods.EventObjectValueChange };
}
else if (idProp == SelectionItemPattern.IsSelectedProperty)
{
return new int [] { NativeMethods.EventObjectSelectionAdd,
NativeMethods.EventObjectSelectionRemove,
NativeMethods.EventObjectSelection};
}
else if (idProp == TogglePattern.ToggleStateProperty)
{
return new int[] { NativeMethods.EventSystemCaptureEnd,
NativeMethods.EventObjectStateChange };
}
return null;
}
// Builds a list of Win32 WinEvents to process a UIAutomation Event.
protected virtual WinEventTracker.EvtIdProperty [] EventToWinEvent (AutomationEvent idEvent, out int cEvent)
{
// Fill this variable with a WinEvent id if found
int idWinEvent = 0;
if (idEvent == SelectionItemPattern.ElementSelectedEvent)
{
cEvent = 2;
return new WinEventTracker.EvtIdProperty[2]
{
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectSelection, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectStateChange, idEvent)
};
}
else if (idEvent == SelectionItemPattern.ElementAddedToSelectionEvent)
{
// For some control, the Event Selection is sent instead of SelectionAdd
// Trap both.
cEvent = 2;
return new WinEventTracker.EvtIdProperty [2]
{
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectSelectionAdd, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectSelection, idEvent)
};
}
else if (idEvent == SelectionItemPattern.ElementRemovedFromSelectionEvent)
{
idWinEvent = NativeMethods.EventObjectSelectionRemove;
}
else if (idEvent == SelectionPattern.InvalidatedEvent)
{
idWinEvent = NativeMethods.EventObjectSelectionWithin;
}
else if (idEvent == InvokePattern.InvokedEvent)
{
cEvent = 4;
return new WinEventTracker.EvtIdProperty[4] {
new WinEventTracker.EvtIdProperty (NativeMethods.EventSystemCaptureEnd, idEvent), // For SysHeaders
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectStateChange, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectValueChange, idEvent), // For WindowsScrollBarBits
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectInvoke, idEvent)
};
}
else if (idEvent == AutomationElement.StructureChangedEvent)
{
cEvent = 3;
return new WinEventTracker.EvtIdProperty[3] {
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectCreate, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectDestroy, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectReorder, idEvent)
};
}
else if (idEvent == TextPattern.TextSelectionChangedEvent)
{
cEvent = 2;
return new WinEventTracker.EvtIdProperty[2] {
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectLocationChange, idEvent),
new WinEventTracker.EvtIdProperty (NativeMethods.EventObjectTextSelectionChanged, idEvent)
};
}
else
{
cEvent = 0;
return null;
}
// found one and only one
cEvent = 1;
return new WinEventTracker.EvtIdProperty [1] { new WinEventTracker.EvtIdProperty (idWinEvent, idEvent) };
}
// Check if a point is within the client Rect of a window
static protected bool PtInClientRect (IntPtr hwnd, int x, int y)
{
NativeMethods.Win32Rect rc = new NativeMethods.Win32Rect ();
if (!Misc.GetClientRect(hwnd, ref rc))
{
return false;
}
if (!Misc.MapWindowPoints(hwnd, IntPtr.Zero, ref rc, 2))
{
return false;
}
return x >= rc.left && x < rc.right && y >= rc.top && y < rc.bottom;
}
#endregion
// -----------------------------------------------------
//
// Private Methods
//
// ------------------------------------------------------
#region Private Methods
// Get the access key of the associated label (if there is
// an associated label).
static protected string GetLabelAccessKey(IntPtr hwnd)
{
string accessKey = string.Empty;
IntPtr label = Misc.GetLabelhwnd(hwnd);
if (label != IntPtr.Zero)
{
string labelText = Misc.ProxyGetText(label);
if (!string.IsNullOrEmpty(labelText))
{
accessKey = Misc.AccessKey(labelText);
}
}
return accessKey;
}
// Builds a list of Win32 WinEvents to process changes in properties changes values.
// Returns an array of Events to Set. The number of valid entries in this array is pass back in cEvents
private WinEventTracker.EvtIdProperty [] PropertyToWinEvent (AutomationProperty [] aProps, out int cEvent)
{
ArrayList alEvents = new ArrayList (16);
foreach (AutomationProperty idProp in aProps)
{
int [] evtId = PropertyToWinEvent (idProp);
for (int i = 0; evtId != null && i < evtId.Length; i++)
{
alEvents.Add (new WinEventTracker.EvtIdProperty (evtId [i], idProp));
}
}
WinEventTracker.EvtIdProperty [] aEvtIdProperties = new WinEventTracker.EvtIdProperty [alEvents.Count];
cEvent = alEvents.Count;
for (int i = 0; i < cEvent; i++)
{
aEvtIdProperties [i] = (WinEventTracker.EvtIdProperty) alEvents [i];
}
return aEvtIdProperties;
}
#endregion
// ------------------------------------------------------
//
// Private Fields
//
// -----------------------------------------------------
#region Private Fields
// True if the control has an associated label.
protected bool _fControlHasLabel = true;
// The hwnd of static text that is functioning as a label for a control.
// This is initialized in GetElementProperty for the Name property and
// used by the LabeledBy property.
// If !_fControlHasLabel, _controlLabel will be IntPtr.Zero.
private IntPtr _controlLabel;
#endregion
}
#endregion
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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