Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / Win32Providers / MS / Internal / AutomationProxies / ProxySimple.cs / 1 / ProxySimple.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: Base class for all the Win32 and office Controls.
//
// The ProxySimple class is the base class for the leafs
// in the raw element tree. Also proxy that directly derives
// from this clas should not care about events
//
// The UIAutomation Simple class is limited to UI elements that are
// Hwnd based. This makes it of little use for Win32 and office controls.
// The ProxySimple class removes this limitation. This leads to a couple of
// changes; RuntTimeID and BoundingRect must be implemented by this object.
//
//
// Class ProxySimple: IRawElementProviderFragment, IRawElementProviderSimple
// BoundingRectangle
// RuntimeId
// Properties
// GetPatterns
// SetFocus
//
// Example: ComboboxButton, MenuItem, Office CommandBar button, ListViewSubitem
//
//
//
// History:
// 07/01/2003 : a-jeanp Created
// 08/06/2003: alexsn - Changes that allow more classes to be derived from Simple
// Description update
//---------------------------------------------------------------------------
// 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.Automation;
using System.Windows.Automation.Provider;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Collections;
using Accessibility;
using System.Windows;
using System.Windows.Input;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
// Base Class for all the Windows Control.
// Implements the default behavior
//
// The distinction between Proxy siblings is made through an ID (called _item).
// The underlying hwnd is kept, as the proxy parent and a flag to _fSubtree.
class ProxySimple : IRawElementProviderSimple, IRawElementProviderFragment
{
// -----------------------------------------------------
//
// Constructors
//
// -----------------------------------------------------
#region Constructors
// Constructor.
// Param "hwnd" is the handle to underlying window
// Param "parent" is the Parent, must be a ProxyFragment
// Param "item" is the ID of item to represent
internal ProxySimple(IntPtr hwnd, ProxyFragment parent, int item)
{
_hwnd = hwnd;
_item = item;
_parent = parent;
// is element a leaf?
_fSubTree = (_parent != null);
}
#endregion
// ------------------------------------------------------
//
// Patterns Implementation
//
// -----------------------------------------------------
#region ProxySimple Methods
internal virtual ProviderOptions ProviderOptions
{
get
{
return ProviderOptions.ClientSideProvider;
}
}
// Returns the bounding rectangle of the control.
// If the control is not an hwnd, the subclass should implement this call
internal virtual Rect BoundingRectangle
{
get
{
if (_hwnd == IntPtr.Zero)
{
return Rect.Empty;
}
NativeMethods.Win32Rect controlRectangle = NativeMethods.Win32Rect.Empty;
if (!Misc.GetWindowRect(_hwnd, ref controlRectangle))
{
return Rect.Empty;
}
// Don't normalize, consumers & subclasses will normalize with conditionals
return controlRectangle.ToRect(false);
}
}
// Sets the focus to this item.
// By default, fails
internal virtual bool SetFocus()
{
return false;
}
// Returns the Run Time Id.
//
// The RunTimeID is a array of int with RID [0] set to 1 and RID [1] the hwnd
// identifier. The remaining of the chain are values one per sub node in
// the raw element tree.
// Avalon and other none hwnd based elements have RunTimeIDs that never starts
// with '1'. This makes the RunTimeId for Win32 controls uniq.
//
// By default the _item data member is used as ID for each depth
// in the element tree
internal virtual int [] GetRuntimeId ()
{
if (_fSubTree && !IsHwndElement())
{
// add the id for this level at the end of the chain
return Misc.AppendToRuntimeId(GetParent().GetRuntimeId(), _item);
}
else
{
// UIA handles runtimeID for the HWND part for us
return null;
}
}
// Get unique ID for this element...
// This is the internal version of GetRuntimeId called when a complete RuntimeId is needed internally (e.g.
// RuntimeId is needed to create StructureChangedEventArgs) vs when UIAutomation asks for a RuntimeId
// through IRawElementProviderFragment. WCTL #32188 : We need a helper method in UIAutomationCore that takes
// an hwnd and returns a RuntimeId. Symptom of this being broken is getting InvalidOperationException
// during events with message: Value cannot be null. Parameter name: runtimeId.
internal int[] MakeRuntimeId()
{
int idLen = ( _fSubTree && !IsHwndElement() ) ? 3 : 2;
int[] id = new int[idLen];
// Base runtime id is the number indicating Win32Provider + hwnd
id[0] = ProxySimple.Win32ProviderRuntimeIdBase;
id[1] = _hwnd.ToInt32();
// Append part id to make this unique
if ( idLen == 3 )
{
id[2] = _item;
}
return id;
}
internal virtual IRawElementProviderSimple HostRawElementProvider
{
get
{
if (_hwnd == IntPtr.Zero || (GetParent() != null && GetParent()._hwnd == _hwnd))
{
return null;
}
return AutomationInteropProvider.HostProviderFromHandle(_hwnd);
}
}
internal virtual ProxySimple GetParent()
{
return _parent;
}
// Process all the Element Properties
internal virtual object GetElementProperty(AutomationProperty idProp)
{
// we can handle some properties locally
if (idProp == AutomationElement.LocalizedControlTypeProperty)
{
return _sType;
}
else if(idProp == AutomationElement.ControlTypeProperty)
{
return _cControlType != null ? (object)_cControlType.Id : null;
}
else if (idProp == AutomationElement.IsContentElementProperty)
{
return _item >= 0 && _fIsContent;
}
else if (idProp == AutomationElement.NameProperty)
{
return LocalizedName;
}
else if (idProp == AutomationElement.AccessKeyProperty)
{
return GetAccessKey();
}
else if (idProp == AutomationElement.IsEnabledProperty)
{
return Misc.IsEnabled(_hwnd);
}
else if (idProp == AutomationElement.IsKeyboardFocusableProperty)
{
return IsKeyboardFocusable();
}
else if (idProp == AutomationElement.ProcessIdProperty)
{
// Get the pid of the process that the HWND lives in, not the
// pid that this proxy lives in
uint pid;
Misc.GetWindowThreadProcessId(_hwnd, out pid);
return (int)pid;
}
else if (idProp == AutomationElement.ClickablePointProperty)
{
NativeMethods.Win32Point pt = new NativeMethods.Win32Point();
if (GetClickablePoint(out pt, !IsHwndElement()))
{
// Due to P/Invoke marshalling issues, the reurn value is in the
// form of a {x,y} array instead of using the Point datatype
return new double[] { pt.x, pt.y };
}
return AutomationElement.NotSupported;
}
else if (idProp == AutomationElement.HasKeyboardFocusProperty)
{
// Check first if the hwnd has the Focus
// Punt if not the case, drill down otherwise
// If already focused, leave as-is. Calling SetForegroundWindow
// on an already focused HWND will remove focus!
return Misc.GetFocusedWindow() == _hwnd ? IsFocused() : false;
}
else if (idProp == AutomationElement.AutomationIdProperty)
{
// PerSharp/PreFast will flag this as a warning 6507/56507: Prefer 'string.IsNullOrEmpty(_sAutomationId)' over checks for null and/or emptiness.
// _sAutomationId being null is invalid, while being empty is a valid state.
// The use of IsNullOrEmpty while hide this.
#pragma warning suppress 6507
System.Diagnostics.Debug.Assert(_sAutomationId != null, "_sAutomationId is null!");
#pragma warning suppress 6507
return _sAutomationId.Length > 0 ? _sAutomationId : null;
}
else if (idProp == AutomationElement.IsOffscreenProperty)
{
return IsOffscreen();
}
else if (idProp == AutomationElement.HelpTextProperty)
{
return HelpText;
}
else if (idProp == AutomationElement.FrameworkIdProperty)
{
return WindowsFormsHelper.IsWindowsFormsControl(_hwnd) ? "WinForm" : "Win32";
}
return null;
}
internal virtual bool IsKeyboardFocusable()
{
// if it curently has focus it is obviosly focusable
if (Misc.GetFocusedWindow() == _hwnd && IsFocused())
{
return true;
}
// If it's visible and enabled it might be focusable
if (SafeNativeMethods.IsWindowVisible(_hwnd) && (bool)GetElementProperty(AutomationElement.IsEnabledProperty))
{
// If it is something that we know is focusable and have marked it that way in the specific
// proxy it should be focusable.
if (IsHwndElement())
{
// For a control that has the WS_TABSTOP style set, it should be focusable.
// Toolbars are genrealy not focusable but the short cut toolbar on the start menu is.
// The WS_TABSTOP will pick this up.
if (Misc.IsBitSet(WindowStyle, NativeMethods.WS_TABSTOP))
{
return true;
}
else
{
return _fIsKeyboardFocusable;
}
}
else
{
return _fIsKeyboardFocusable;
}
}
return false;
}
internal virtual bool IsOffscreen()
{
Rect itemRect = BoundingRectangle;
if (itemRect.IsEmpty)
{
return true;
}
// As per the specs, IsOffscreen only takes immediate parent-child relationship into account,
// so we only need to check if this item in offscreen with respect to its immediate parent.
ProxySimple parent = GetParent();
if (parent != null )
{
if ((bool)parent.GetElementProperty(AutomationElement.IsOffscreenProperty))
{
return true;
}
// Now check to see if this item in visible on its parent
Rect parentRect = parent.BoundingRectangle;
if (!parentRect.IsEmpty && !Misc.IsItemVisible(ref parentRect, ref itemRect))
{
return true;
}
}
// if this element is not on any monitor than it is off the screen.
NativeMethods.Win32Rect itemWin32Rect = new NativeMethods.Win32Rect(itemRect);
return UnsafeNativeMethods.MonitorFromRect(ref itemWin32Rect, UnsafeNativeMethods.MONITOR_DEFAULTTONULL) == IntPtr.Zero;
}
internal virtual string GetAccessKey()
{
// If the control is part of a dialog box or a form,
// get the accelerator from the static preceding that control
// on the dialog.
if (GetParent() == null && (bool)GetElementProperty(AutomationElement.IsKeyboardFocusableProperty))
{
string sRawName = Misc.GetControlName(_hwnd, false);
return string.IsNullOrEmpty(sRawName) ? null : Misc.AccessKey(sRawName);
}
return null;
}
// Returns a pattern interface if supported.
internal virtual object GetPatternProvider(AutomationPattern iid)
{
return null;
}
internal virtual ProxySimple[] GetEmbeddedFragmentRoots()
{
return null;
}
//Gets the controls help text
internal virtual string HelpText
{
get
{
return null;
}
}
// Gets the localized name
internal virtual string LocalizedName
{
get
{
return null;
}
}
#endregion
#region Dispatch Event
// Dispatch WinEvent notifications
//
// A Generic mechanism is implemented to support most WinEvents.
// On reception of a WinEvent, a Proxy is created and a call to this method
// is made. This method then raises a UIAutomation Events based on the
// WinEvents IDs. The old value for a property is always set to null
internal virtual void DispatchEvents(int eventId, object idProp, int idObject, int idChild)
{
EventManager.DispatchEvent(this, _hwnd, eventId, idProp, idObject);
}
internal virtual void RecursiveRaiseEvents(object idProp, AutomationPropertyChangedEventArgs e)
{
return;
}
#endregion
#region IRawElementProviderSimple
// ------------------------------------------------------
//
// Default implementation for the IRawElementProviderSimple.
// Maps the UIAutomation methods to ProxySimple methods.
//
// ------------------------------------------------------
ProviderOptions IRawElementProviderSimple.ProviderOptions
{
get
{
return ProviderOptions;
}
}
// Return the context associated with this element
IRawElementProviderSimple IRawElementProviderSimple.HostRawElementProvider
{
get
{
return HostRawElementProvider;
}
}
// Request the closest rectangle encompassing this element
Rect IRawElementProviderFragment.BoundingRectangle
{
get
{
// Spec says that if an element is offscreen, we have the option of letting
// the rect pass through or returning Rect.Empty; here, we intentionally
// let it pass through as a convenience for MITA.
// ProxySimple.BoundingRectanlgle
return BoundingRectangle;
}
}
// Request to return the element in the specified direction
// ProxySimple object are leaf so it returns null except for the parent
IRawElementProviderFragment IRawElementProviderFragment.Navigate(NavigateDirection direction)
{
System.Diagnostics.Debug.Assert(_parent != null, "Navigate: Leaf element does not have parent");
switch (direction)
{
case NavigateDirection.Parent:
{
return GetParent();
}
case NavigateDirection.NextSibling:
{
// NOTE: Do not use GetParent(), call _parent explicitly
return _parent.GetNextSibling(this);
}
case NavigateDirection.PreviousSibling:
{
// NOTE: Do not use GetParent(), call _parent explicitly
return _parent.GetPreviousSibling(this);
}
}
return null;
}
IRawElementProviderFragmentRoot IRawElementProviderFragment.FragmentRoot
{
// NOTE: The implementation below is correct one.
// DO NOT CHANGE IT, since things will break
// There can be only 1 ROOT for each constellation
get
{
// Traverse up the parents until you find a node with no parents, this is the root
ProxySimple walk = this;
while (walk.GetParent() != null)
{
walk = walk.GetParent();
}
return walk as IRawElementProviderFragmentRoot;
}
}
// Returns the Run Time Id, an array of ints as the concatenation of IDs.
int [] IRawElementProviderFragment.GetRuntimeId ()
{
//ProxySimple.GetRuntimeId ();
return GetRuntimeId ();
}
// Returns a pattern interface if supported.
object IRawElementProviderSimple.GetPatternProvider(int patternId)
{
AutomationPattern iid = AutomationPattern.LookupById(patternId);
return GetPatternProvider(iid);
}
// Returns a given property
// UIAutomation as a generic call for all the properties for all the patterns.
// This routine splits properties per pattern and calls the appropriate routine
// within a pattern.
// A default implementation is provided for some properties
object IRawElementProviderSimple.GetPropertyValue(int propertyId)
{
AutomationProperty idProp = AutomationProperty.LookupById(propertyId);
return GetElementProperty(idProp);
}
// If this UI is capable of hosting other UI that also supports UIAutomation,
// and the subtree rooted at this element contains such hosted UI fragments,
// this should return an array of those fragments.
//
// If this UI does not host other UI, it may return null.
IRawElementProviderSimple[] IRawElementProviderFragment.GetEmbeddedFragmentRoots()
{
return GetEmbeddedFragmentRoots();
}
// Request that focus is set to this item.
// The UIAutomation framework will ensure that the UI hosting this fragment
// is already focused before calling this method, so this method should only
// update its internal focus state; it should not attempt to give its own
// HWND the focus, for example.
void IRawElementProviderFragment.SetFocus()
{
// Make sure that the control is enabled
if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
{
throw new ElementNotEnabledException();
}
// A number of the Override Proxies return null from the GetElementProperty() method. If
// a SetFocus() was called on them, the case to bool will cause a NullReferenceException.
// So make sure the return is of type bool before casting.
bool isKeyboardFocusable = true;
object isKeyboardFocusableProperty = GetElementProperty(AutomationElement.IsKeyboardFocusableProperty);
if (isKeyboardFocusableProperty is bool)
{
isKeyboardFocusable = (bool)isKeyboardFocusableProperty;
}
// UIAutomation already focuses the containing HWND for us, so only need to
// set focus on the item within that...
if (isKeyboardFocusable)
{
// Then set the focus on this item (virtual methods)
SetFocus();
return;
}
throw new InvalidOperationException(SR.Get(SRID.SetFocusFailed));
}
#endregion
//-----------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// Returns the clickable point on the element
// In the case when clickable point is obtained - method returns true
// In the case when clickable point cannot be obtained - method returns false
internal bool GetClickablePoint(out NativeMethods.Win32Point pt, bool fClipClientRect)
{
NativeMethods.Win32Rect rcItem = new NativeMethods.Win32Rect(BoundingRectangle);
// Intersect the bounding Rectangle with the client rectangle for framents
// and simple items - use the override flag (used mostly for the non client area
if (fClipClientRect && !_fNonClientAreaElement)
{
NativeMethods.Win32Rect rcOutside = new NativeMethods.Win32Rect();
Misc.GetClientRectInScreenCoordinates(_hwnd, ref rcOutside);
if (!Misc.IntersectRect(ref rcItem, ref rcOutside, ref rcItem))
{
pt.x = pt.y = 0;
return false;
}
}
ArrayList alIn = new ArrayList(100);
ArrayList alOut = new ArrayList(100);
// Get the mid point to start with
pt.x = (rcItem.right - 1 + rcItem.left) / 2;
pt.y = (rcItem.bottom - 1 + rcItem.top) / 2;
alOut.Add(new ClickablePoint.CPRect(ref rcItem, true));
// First go through all the children to exclude whatever is on top
ProxyFragment proxyFrag = this as ProxyFragment;
if (proxyFrag != null)
{
ClickablePoint.ExcludeChildren(proxyFrag, alIn, alOut);
}
return ClickablePoint.GetPoint(_hwnd, alIn, alOut, ref pt);
}
internal string GetAccessibleName(int item)
{
string name = null;
IAccessible acc = AccessibleObject;
if (acc != null)
{
name = acc.get_accName(item);
name = string.IsNullOrEmpty(name) ? null : name;
}
return name;
}
#endregion
// -----------------------------------------------------
//
// Internal Properties
//
// -----------------------------------------------------
#region Internal Properties
// Returns the IAccessible interface for the container object
internal virtual IAccessible AccessibleObject
{
get
{
if (_IAccessible == null)
{
Accessible acc = null;
// We need to go search for it
_IAccessible = Accessible.AccessibleObjectFromWindow(_hwnd, NativeMethods.OBJID_CLIENT, ref acc) == NativeMethods.S_OK ? acc.IAccessible : null;
}
return _IAccessible;
}
set
{
_IAccessible = value;
}
}
// Get the hwnd for this element
internal IntPtr WindowHandle
{
get
{
return _hwnd;
}
}
// Reference to the window Handle
internal int WindowStyle
{
get
{
return Misc.GetWindowStyle(_hwnd);
}
}
//Gets the extended style of the window
internal int WindowExStyle
{
get
{
return Misc.GetWindowExStyle(_hwnd);
}
}
#endregion
// -----------------------------------------------------
//
// Internal Fields
//
// ------------------------------------------------------
#region Internal Fields
// Reference to the window Handle
internal IntPtr _hwnd;
// Is used to discriminate between items in a collection.
internal int _item;
// Parent of a subtree.
internal ProxyFragment _parent;
// Localized Control type name. If the control has a ControlType this should not be set.
internal string _sType;
// Must be set by a subclass, used to return the automation id
internal string _sAutomationId = "";
// Used by the IsFocussable Property.
// By default all elements are not Keyboard focusable, overide this flag
// to change the default behavior.
internal bool _fIsKeyboardFocusable;
// Top level Desktop window
internal static IntPtr _hwndDesktop = UnsafeNativeMethods.GetDesktopWindow();
// Identifies an element as hwnd-based; used as the first value in RuntimeId for Win32 providers.
internal const int Win32ProviderRuntimeIdBase = 1;
#endregion
// -----------------------------------------------------
//
// Protected Methods
//
// ------------------------------------------------------
#region Protected Methods
// This routine is only called on elements belonging to an hwnd
// that has the focus.
// Overload this routine for sub elements within an hwnd that can
// have the focus, tab items, listbox items ...
// The default implemention is to return true for proxy element
// that are hwnd.
protected virtual bool IsFocused ()
{
return this is ProxyHwnd;
}
protected bool IsHwndElement()
{
return this is ProxyHwnd;
}
#endregion
// ------------------------------------------------------
//
// Protected Fields
//
// -----------------------------------------------------
#region Protected Fields
// True if this is a WindowsForms control.
// This value is cached and calculated only when needed
protected WindowsFormsHelper.FormControlState _windowsForms = WindowsFormsHelper.FormControlState.Undeterminate;
// Which Controltype it is, Must be set by a subclass
protected ControlType _cControlType;
// Must be set by a subclass,
// Prevents the generic generation of the persistent IDs
protected bool _fHasPersistentID = true;
// Used by the GetClickablePoint Logic to figure out if clipping
// must happen on the Client Rect or the Non ClientRect
protected bool _fNonClientAreaElement;
// true if the parent is of type ProxyFragment
protected bool _fSubTree;
// Tells whether then control is Content or Peripheral
protected bool _fIsContent = true;
// The IAccessible interface associated with this node
protected IAccessible _IAccessible;
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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