Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / UIAutomation / Win32Providers / MS / Internal / AutomationProxies / WindowsComboBox.cs / 1 / WindowsComboBox.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: Win32 Combobox proxy
//
// History:
// alexsn - Created
//
//---------------------------------------------------------------------------
using System;
using System.Globalization;
using System.Text;
using System.ComponentModel;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows;
using System.Runtime.InteropServices;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
// Combobox Logical Tree and Patterns (NOTE: Edit is removed, by Design)
//
// Combo box (Commands, ExpandCollapse, Selection, Text, Value)
// --List box (Selection, Scroll, Text) [container]
// -----List item (Selection Item, Text)
// -----List item (Selection Item, Text)
// -----List item (Selection Item, Text)
// --DropDownButton peripheral (Invoke)
//
// NOTE: We will reparent the List portion of the combo (ComboLBox) by
// 1. We will provide a proxy for List portion (actually we will reuse WindowsListBox for it)
// 2. List Host will refer to the ComboLBox hwnd
// 3. Providing an ability to navigate from Combo to List and returtning Combo as
// List's parent
// Combobox proxy
class WindowsComboBox : ProxyHwnd, IValueProvider, IExpandCollapseProvider
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructor
WindowsComboBox (IntPtr hwnd, ProxyFragment parent, IntPtr hwndEx, int item)
: base(hwnd, parent, item)
{
_cControlType = ControlType.ComboBox;
_hwndEx = hwndEx;
_comboType = GetComboType ();
_fIsKeyboardFocusable = true;
_createOnEvent = new WinEventTracker.ProxyRaiseEvents (RaiseEvents);
}
#endregion Constructor
#region Proxy Create
// Static Create method called by UIAutomation to create this proxy.
// returns null if unsuccessful
internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild, int idObject)
{
return Create(hwnd, idChild);
}
internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild)
{
// Something is wrong if idChild is not zero
if (idChild != 0)
{
System.Diagnostics.Debug.Assert (idChild == 0, "Invalid Child Id, idChild != 0");
throw new ArgumentOutOfRangeException("idChild", idChild, SR.Get(SRID.ShouldBeZero));
}
return new WindowsComboBox(hwnd, null, HostedByComboEx(hwnd), idChild);
}
#endregion
//------------------------------------------------------
//
// Pattern Implementation
//
//-----------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider (AutomationPattern iid)
{
if (iid == ValuePattern.Pattern && IsEditableCombo())
{
return this;
}
else if (iid == ExpandCollapsePattern.Pattern && !IsSimpleCombo ())
{
return this;
}
else if (iid == SelectionPattern.Pattern)
{
// delegate work to the WindowsListBox implementation of ISelection
ProxySimple list = CreateListBox ();
if (list != null)
{
ISelectionProvider selection = list.GetPatternProvider (iid) as ISelectionProvider;
if (selection != null)
{
return selection;
}
}
}
//
return null;
}
// Gets the bounding rectangle for this element
internal override Rect BoundingRectangle
{
get
{
NativeMethods.Win32Rect rcCombo = new NativeMethods.Win32Rect (base.BoundingRectangle);
if (GetDroppedState (_hwnd))
{
// NOTE: Do not use CB_GETDROPPEDCONTROLRECT
// it will not produce the correct rect
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
NativeMethods.Win32Rect rcList = NativeMethods.Win32Rect.Empty;
if (!Misc.GetWindowRect(cbInfo.hwndList, ref rcList))
{
return Rect.Empty;
}
if (!Misc.UnionRect(out rcCombo, ref rcCombo, ref rcList))
{
return Rect.Empty;
}
}
}
return rcCombo.ToRect(Misc.IsControlRTL(_hwnd));
}
}
// Process all the Logical and Raw Element Properties
internal override object GetElementProperty (AutomationProperty idProp)
{
if (idProp == AutomationElement.NameProperty)
{
if (Misc.GetClassName(_hwnd).Equals("Internet Explorer_TridentCmboBx"))
{
object result = base.GetElementProperty(idProp);
// Return an empty string instead of null to prevent the default HWND proxy
// from using the window text as the name - since the window text for this owner-
// draw trident combo is garbage.
return result == null ? "" : (string)result;
}
}
// EventManager.DispatchEvent() genericaly uses GetElementProperty()
// to get properties during a property change event. Proccess ExpandCollapseStateProperty
// so the ExpandCollapseStateProperty Change Event can get the correct state.
else if (idProp == ExpandCollapsePattern.ExpandCollapseStateProperty)
{
return ((IExpandCollapseProvider)this).ExpandCollapseState;
}
return base.GetElementProperty (idProp);
}
internal override ProxySimple [] GetEmbeddedFragmentRoots ()
{
// Only applies to drop-down lists, which reparent the list, need to do this...
if (IsSimpleCombo())
return null;
// Because we are moving the listbox portion of the combo from the being a child of the
// desktop to a child of the combo, We have to tell automation the that this is one of our
// children so the listbox will get advised of events added/removed.
return new ProxySimple[] { CreateListBox() };
}
//Gets the localized name
internal override string LocalizedName
{
get
{
// In the case of ComboBoxEx32, this element's _hwnd will be the
// HWND of the ComboBox which is a child of ComboBoxEx the lable that names
// Combobox however is a sibling of ComboBoxEx32, hence we need to handle this case here
if (IsComboBoxEx32())
{
return Misc.GetControlName(Misc.GetLabelhwnd(_hwndEx), true);
}
return null;
}
}
#endregion ProxySimple Interface
#region ProxyFragment Interface
// Returns the next sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null if no next child
internal override ProxySimple GetNextSibling (ProxySimple child)
{
if (child._item == (int) ComboChildren.List && !IsSimpleCombo ())
{
return CreateComboButton ();
}
return null;
}
// Returns the previous sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null is no previous
internal override ProxySimple GetPreviousSibling (ProxySimple child)
{
if (child._item == (int) ComboChildren.Button)
{
return CreateListBox ();
}
return null;
}
// Returns the first child element in the raw hierarchy.
internal override ProxySimple GetFirstChild ()
{
// List portion is a first child of the combo-box
return CreateListBox ();
}
// Returns the last child element in the raw hierarchy.
internal override ProxySimple GetLastChild ()
{
if (IsSimpleCombo ())
{
// there is no DropDown button
return CreateListBox ();
}
return CreateComboButton ();
}
// Returns a Proxy element corresponding to the specified screen coordinates.
internal override ProxySimple ElementProviderFromPoint (int x, int y)
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
// check for button
if (Misc.MapWindowPoints(_hwnd, IntPtr.Zero, ref cbInfo.rcButton, 2))
{
if (Misc.PtInRect(ref cbInfo.rcButton, x, y))
{
return new WindowsComboButton(_hwnd, this, (int)ComboChildren.Button);
}
}
// check for list
if (SafeNativeMethods.IsWindowVisible(cbInfo.hwndList))
{
NativeMethods.Win32Rect rcList = NativeMethods.Win32Rect.Empty;
if (Misc.GetWindowRect(cbInfo.hwndList, ref rcList) &&
Misc.PtInRect(ref rcList, x, y))
{
ProxySimple el = CreateListBox(cbInfo.hwndList);
return ((WindowsListBox) el).ElementProviderFromPoint (x, y);
}
}
}
return this;
}
#endregion
#region ProxyHwnd Interface
// override the default implementation so we can handle the WinEvents that are send to the edit
// portion of ComboBox (Combo proxy will hide edit portion from the user, but will take care of all
// the features/functionality that Edit presents) and some(show, hide) events that are send to the List portion of combo
// In both cases this events will be presented to the user as Combo's LE events
internal override void AdviseEventAdded (AutomationEvent eventId, AutomationProperty [] aidProps)
{
// call the base class implementation first to add combo-specific things and register combo specific callback
base.AdviseEventAdded (eventId, aidProps);
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST are still editable.
if (cbInfo.hwndItem != IntPtr.Zero && IsEditableCombo())
{
// subscribe to edit-specific notifications, that would be presented as combo le event
// ValueAsString, ValueAsObject, IsReadOnly
// create array containing events that user is interested in
WinEventTracker.EvtIdProperty [] editPortionEvents;
int counter;
CreateEditPortionEvents (out editPortionEvents, out counter, aidProps);
if ( counter > 0 )
{
WinEventTracker.AddToNotificationList( cbInfo.hwndItem, new WinEventTracker.ProxyRaiseEvents( EditPortionEvents ), editPortionEvents, counter );
}
}
}
// Need to also advise the list portions of the combobox so that it can raise events.
if (cbInfo.hwndList != IntPtr.Zero)
{
WindowsListBox listbox = new WindowsListBox(cbInfo.hwndList, this, 0, true);
listbox.AdviseEventAdded(eventId, aidProps);
}
}
}
internal override void AdviseEventRemoved (AutomationEvent eventId, AutomationProperty [] aidProps)
{
// remove combo-related events
base.AdviseEventRemoved (eventId, aidProps);
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
// remove edit and list specific events that got remapped into combo's events
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST are still editable.
if (cbInfo.hwndItem != IntPtr.Zero && IsEditableCombo())
{
// un-subscribe from edit-specific notifications
// ValueAsString, ValueAsObject, IsReadOnly
// create array containing events from which user wants to unsubscribe
WinEventTracker.EvtIdProperty [] editPortionEvents;
int counter;
CreateEditPortionEvents (out editPortionEvents, out counter, aidProps);
if ( counter > 0 )
{
WinEventTracker.RemoveToNotificationList( cbInfo.hwndItem, editPortionEvents, null, counter );
}
}
}
// Need to also remove the advise from the list portions of the combobox.
if (cbInfo.hwndList != IntPtr.Zero)
{
WindowsListBox listbox = new WindowsListBox(cbInfo.hwndList, this, 0, true);
listbox.AdviseEventRemoved(eventId, aidProps);
}
}
}
#endregion
#region Value Pattern
// Sets the text of the edit part of the Combo
void IValueProvider.SetValue (string str)
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
// piggy-back on win32editbox proxy
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo) && SafeNativeMethods.IsWindowVisible(cbInfo.hwndItem))
{
WindowsEditBox editBox = new WindowsEditBox(cbInfo.hwndItem, null, -1);
IValueProvider valueProvider = (IValueProvider) editBox.GetPatternProvider (ValuePattern.Pattern);
// try to set user-provided text
valueProvider.SetValue (str);
// Let the parent know that the value has change, to allow the parent to do any processing it needs
// to do on value change.
IntPtr hwndParent = Misc.GetParent(_hwnd);
if (hwndParent != IntPtr.Zero)
{
int id = Misc.GetWindowId(_hwnd);
IntPtr wParam = new IntPtr(NativeMethods.Util.MAKELONG(id, NativeMethods.CBN_EDITUPDATE));
Misc.ProxySendMessage(hwndParent, NativeMethods.WM_COMMAND, wParam, _hwnd);
}
return;
}
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
// Request to get the value that this UI element is representing as a string
string IValueProvider.Value
{
get
{
return Text;
}
}
bool IValueProvider.IsReadOnly
{
get
{
if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
{
return true;
}
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST are still editable.
if (IsComboBoxEx32())
{
return false;
}
else
{
return IsDropDownListCombo();
}
}
}
#endregion ValuePattern
#region ExpandCollapse Pattern
void IExpandCollapseProvider.Expand ()
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
if (GetDroppedState (_hwnd))
{
// list portion is already visible
return;
}
Expand (_hwnd);
}
void IExpandCollapseProvider.Collapse ()
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
if (!GetDroppedState (_hwnd))
{
// list portion is already collapsed
return;
}
Collapse(_hwnd);
}
ExpandCollapseState IExpandCollapseProvider.ExpandCollapseState
{
get
{
return (GetDroppedState (_hwnd)) ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed;
}
}
#endregion ExpandCollapse Pattern
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
internal bool IsSimpleCombo ()
{
return (NativeMethods.CBS_SIMPLE == _comboType);
}
// no edit portion....
internal bool IsDropDownListCombo ()
{
return (NativeMethods.CBS_DROPDOWNLIST == _comboType);
}
// get text of the listboxitem (external use)
internal string GetListItemText (int index)
{
IntPtr hwndToAsk = IsComboBoxEx32() ? _hwndEx : _hwnd;
return SpecialText (hwndToAsk, index);
}
// Detect if our combobox is hosted inside of comboex
// This is important to know becuase:
// Real styles will be provided by comboex
// comboex supplies the edit
static internal IntPtr HostedByComboEx (IntPtr hwnd)
{
IntPtr hwndEx = UnsafeNativeMethods.GetAncestor (hwnd, NativeMethods.GA_PARENT);
if ((IntPtr.Zero != hwndEx) && IsComboEx (hwndEx))
{
return hwndEx;
}
return IntPtr.Zero;
}
// Wrapper on top of Win32's GetComboInfo
static internal bool GetComboInfo(IntPtr hwnd, ref NativeMethods.COMBOBOXINFO cbInfo)
{
bool result = Misc.GetComboBoxInfo(hwnd, ref cbInfo);
if (result)
{
// some combo boxes do not have an edit portion
// instead they return combo hwnd in the item
// to make our life easier set hwndItem to IntPtr.Zero
if (cbInfo.hwndItem == cbInfo.hwndCombo)
{
cbInfo.hwndItem = IntPtr.Zero;
}
// Possible that Combo is hosted by ComboboxEx32
// hence GetComboBoxInfo did not provide us with edit.
// We should try to detect it ourselves
if (cbInfo.hwndItem == IntPtr.Zero && IsComboEx (UnsafeNativeMethods.GetAncestor (hwnd, NativeMethods.GA_PARENT)))
{
cbInfo.hwndItem = Misc.FindWindowEx(hwnd, IntPtr.Zero, "EDIT", null);
if (cbInfo.hwndItem != IntPtr.Zero)
{
result = Misc.GetWindowRect(cbInfo.hwndItem, ref cbInfo.rcItem);
if( result)
{
result = Misc.MapWindowPoints(_hwndDesktop, hwnd, ref cbInfo.rcItem, 2);
}
if (!result)
{
cbInfo.rcItem = NativeMethods.Win32Rect.Empty;
}
}
}
}
return result;
}
// determin if the list portion of combo is dropped
static internal bool GetDroppedState (IntPtr hwnd)
{
return Misc.ProxySendMessageInt(hwnd, NativeMethods.CB_GETDROPPEDSTATE, IntPtr.Zero, IntPtr.Zero) != 0;
}
// expand the list portion
static internal void Expand (IntPtr hwnd)
{
IntPtr hwndFocused = Misc.GetFocusedWindow();
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
GetComboInfo(hwnd, ref cbInfo);
// if the combobox does not already have focus, set the focus.
if (hwndFocused != hwnd && hwndFocused != cbInfo.hwndCombo && hwndFocused != cbInfo.hwndItem && hwndFocused != cbInfo.hwndList)
{
Misc.SetFocus(hwnd);
}
Misc.ProxySendMessage(hwnd, NativeMethods.CB_SHOWDROPDOWN, new IntPtr(1), IntPtr.Zero);
}
// collapse the list portion
static internal void Collapse (IntPtr hwnd)
{
Misc.ProxySendMessage(hwnd, NativeMethods.CB_SHOWDROPDOWN, new IntPtr(0), IntPtr.Zero);
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Fields
//
//------------------------------------------------------
#region Internal Fields
// enum describing children of the combobox
internal enum ComboChildren: int
{
Button = -1,
List = 2
}
internal const string Combobox = "ComboBox";
#endregion Internal Fields
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
// retrieve combobox text
private string Text
{
get
{
if (IsDropDownListCombo() && IsComboBoxEx32())
{
// special case ComboboxEx droplist
string text = SpecialText(_hwndEx, -1);
if (!string.IsNullOrEmpty(text))
{
return text;
}
}
// all other cases
return Misc.ProxyGetText(IsComboBoxEx32() ? _hwndEx : _hwnd);
}
}
private int GetComboType()
{
IntPtr hwnd = IsComboBoxEx32() ? _hwndEx : _hwnd;
return (Misc.GetWindowStyle(hwnd) & NativeMethods.CBS_COMBOTYPEMASK);
}
// create combo button
private ProxySimple CreateComboButton ()
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo) && cbInfo.stateButton != NativeMethods.STATE_SYSTEM_INVISIBLE)
{
return new WindowsComboButton (_hwnd, this, (int) ComboChildren.Button);
}
return null;
}
// create list portion of combo box
private ProxySimple CreateListBox()
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo) && (IntPtr.Zero != cbInfo.hwndList))
{
return new WindowsListBox(cbInfo.hwndList, this, (int)ComboChildren.List, true);
}
return null;
}
// create listbox from known hwnd
private ProxySimple CreateListBox (IntPtr hwndList)
{
return new WindowsListBox(hwndList, this, (int)ComboChildren.List, true);
}
// detect if passed int window corresponds to the comboex
static private bool IsComboEx (IntPtr hwndEx)
{
if (hwndEx == IntPtr.Zero)
{
return false;
}
return (0 == String.Compare(Misc.GetClassName(hwndEx), ComboboxEx32, StringComparison.OrdinalIgnoreCase));
}
private bool IsEditableCombo()
{
// Standard Combo Box controls with the style CBS_DROPDOWNLIST has the edit control replaced by a
// static text item to displays the current selection in the list box. This is not true of
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST.
return !IsDropDownListCombo() || IsComboBoxEx32();
}
// Retrieve the text of the list portion of Combo.
// Or Text of the edit portion of ComboBoxEx32 (path -1 as index)
// Use CB_XXX instead of LB_XXX, since CB_XXX will give us back text in ownerdrawn combo
static private string SpecialText (IntPtr hwnd, int index)
{
if (index == -1)
{
// get the selected element
index = Misc.ProxySendMessageInt(hwnd, NativeMethods.CB_GETCURSEL, IntPtr.Zero, IntPtr.Zero);
if (index == -1)
{
return "";
}
}
int len = Misc.ProxySendMessageInt(hwnd, NativeMethods.CB_GETLBTEXTLEN, new IntPtr(index), IntPtr.Zero);
if (len < 1)
{
return "";
}
if (Misc.GetClassName(hwnd).Equals("Internet Explorer_TridentCmboBx"))
{
// The Trident listbox is a superclassed standard listbox.
// Trident listboxes are owner draw that does not have the hasstring style set.
// All the control contains is the owner draw data and not text. Private
// messages were added to retrieve the owner draw data as text. The new messages
// are used just like the normally LB_GETTEXT and CB_GETTEXT messages.
return XSendMessage.GetItemText(hwnd, NativeMethods.WM_USER + NativeMethods.CB_GETLBTEXT, index, len);
}
else
{
return Misc.GetUnsafeText(hwnd, NativeMethods.CB_GETLBTEXT, new IntPtr(index), len);
}
}
// Combo-specific events
static private void RaiseEvents (IntPtr hwnd, int eventId, object idProp, int idObject, int idChild)
{
// -----------------------------------------------------/////////////////////////////////////
//
// Depending of the type of Combobox we will get different WinEvents
//
// Simple: No events
//
// DropDown: OBJ_STATECHANGE: for the dropbutton button (idChild == 2)
// NOTE: that OBJECT_STATECHANGE will only be generated when user uses button to show the list
// if user uses the button to hide the list, event will not be generated
//
// DropDownList: OBJ_STATECHANGE (same as above)
// : OBJECT_VALUECHANGE - when using the keyboard to navigate between list children
// - no need to handle it here, ListBox proxy will take care of that
//
// ------------------------------------------------------//////////////////////////////////////
ProxySimple el = null;
if (idProp is AutomationProperty && idProp == ExpandCollapsePattern.ExpandCollapseStateProperty)
{
// expand/collapse events are handled in WindowsListBox with the ComboLBox hwnd.
// so just return here so we don't fire extraneous events
return;
}
switch (idObject)
{
case NativeMethods.OBJID_CLIENT :
{
if (eventId == NativeMethods.EventObjectStateChange && idChild == 2)
{
// event came for combobutton
// We will be getting 2 OBJECT_STATECHANGED event
// one with button state pressed and another normal
// both indicate the same invoke event
// hence second event is a duplicate of the first one and we need to filter it out
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (WindowsComboBox.GetComboInfo(hwnd, ref cbInfo) && Misc.IsBitSet(NativeMethods.STATE_SYSTEM_PRESSED, cbInfo.stateButton))
{
// The event could be for both the button and the combo
WindowsComboBox cb = (WindowsComboBox) Create (hwnd, 0);
cb.DispatchEvents (eventId, idProp, idObject, idChild);
el = cb.CreateComboButton ();
el.DispatchEvents (eventId, idProp, idObject, idChild);
return;
}
}
el = (ProxySimple) Create (hwnd, 0);
break;
}
}
if (el != null)
{
el.DispatchEvents (eventId, idProp, idObject, idChild);
}
}
// Handles combo's edit portion specific events
// as combo-specific events
private static void EditPortionEvents (IntPtr hwnd, int eventId, object idProp, int idObject, int idChild)
{
// Get hwnd of the combo-box
IntPtr hwndCombo = UnsafeNativeMethods.GetAncestor (hwnd, NativeMethods.GA_PARENT);
if (hwndCombo != IntPtr.Zero)
{
ProxySimple el = (ProxySimple) Create (hwndCombo, 0);
el.DispatchEvents (eventId, idProp, idObject, idChild);
}
}
// Return an array that contains combo's edit portion specific events
// These events will be remapped as combo box events
private static void CreateEditPortionEvents (out WinEventTracker.EvtIdProperty [] editPortionEvents, out int counter, AutomationProperty [] aidProps)
{
// count how many events to pass back for the edit part of combo
int c = 0;
foreach ( AutomationProperty p in aidProps )
{
if ( p == ValuePattern.ValueProperty || p == ValuePattern.IsReadOnlyProperty )
{
c++;
}
}
if (c == 0)
{
editPortionEvents = null;
counter = 0;
return;
}
// allocate array with the number of events from above
editPortionEvents = new WinEventTracker.EvtIdProperty[c];
c = 0;
foreach ( AutomationProperty p in aidProps )
{
if ( p == ValuePattern.ValueProperty || p == ValuePattern.IsReadOnlyProperty )
{
editPortionEvents[c]._idProp = p;
editPortionEvents[c]._evtId = (p == ValuePattern.ValueProperty) ? NativeMethods.EventObjectValueChange : NativeMethods.EventObjectStateChange;
c++;
}
}
counter = c;
}
// When _hwndEx is not IntPtr.Zero the control is a ComboBoxEx32 control.
private bool IsComboBoxEx32()
{
return _hwndEx != IntPtr.Zero;
}
#endregion Private Methods
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private fields
// HWND of ComboBoxEx32 (if exist)
private IntPtr _hwndEx;
private int _comboType;
private const string ComboboxEx32 = "ComboBoxEx32";
#endregion Private fields
//------------------------------------------------------
//
// WindowsComboButton Private Class
//
//-----------------------------------------------------
#region WindowsComboButton
// Proxy for ComboBox button
class WindowsComboButton: ProxySimple, IInvokeProvider
{
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructor
internal WindowsComboButton (IntPtr hwnd, ProxyFragment parent, int item)
: base(hwnd, parent, item)
{
_cControlType = ControlType.Button;
_sAutomationId = "DropDown"; // This string is a non-localizable string
}
#endregion Constructor
//-----------------------------------------------------
//
// Pattern Implementation
//
//-----------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider (AutomationPattern iid)
{
if (iid == InvokePattern.Pattern)
{
return this;
}
return null;
}
// Gets the bounding rectangle for this element
internal override Rect BoundingRectangle
{
get
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (!WindowsComboBox.GetComboInfo(_hwnd, ref cbInfo))
{
return Rect.Empty;
}
if (!Misc.MapWindowPoints(_hwnd, IntPtr.Zero, ref cbInfo.rcButton, 2))
{
return Rect.Empty;
}
return cbInfo.rcButton.ToRect(Misc.IsControlRTL(_hwnd));
}
}
//Gets the localized name
internal override string LocalizedName
{
get
{
return ST.Get(STID.LocalizedNameWindowsComboButton);
}
}
#endregion ProxySimple Interface
#region Invoke Pattern
// Same effect as a click on the drop down button
void IInvokeProvider.Invoke ()
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
if (!WindowsComboBox.GetDroppedState (_hwnd))
{
WindowsComboBox.Expand (_hwnd);
}
else
{
WindowsComboBox.Collapse (_hwnd);
}
}
#endregion Invoke Pattern
}
#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: Win32 Combobox proxy
//
// History:
// alexsn - Created
//
//---------------------------------------------------------------------------
using System;
using System.Globalization;
using System.Text;
using System.ComponentModel;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows;
using System.Runtime.InteropServices;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
// Combobox Logical Tree and Patterns (NOTE: Edit is removed, by Design)
//
// Combo box (Commands, ExpandCollapse, Selection, Text, Value)
// --List box (Selection, Scroll, Text) [container]
// -----List item (Selection Item, Text)
// -----List item (Selection Item, Text)
// -----List item (Selection Item, Text)
// --DropDownButton peripheral (Invoke)
//
// NOTE: We will reparent the List portion of the combo (ComboLBox) by
// 1. We will provide a proxy for List portion (actually we will reuse WindowsListBox for it)
// 2. List Host will refer to the ComboLBox hwnd
// 3. Providing an ability to navigate from Combo to List and returtning Combo as
// List's parent
// Combobox proxy
class WindowsComboBox : ProxyHwnd, IValueProvider, IExpandCollapseProvider
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructor
WindowsComboBox (IntPtr hwnd, ProxyFragment parent, IntPtr hwndEx, int item)
: base(hwnd, parent, item)
{
_cControlType = ControlType.ComboBox;
_hwndEx = hwndEx;
_comboType = GetComboType ();
_fIsKeyboardFocusable = true;
_createOnEvent = new WinEventTracker.ProxyRaiseEvents (RaiseEvents);
}
#endregion Constructor
#region Proxy Create
// Static Create method called by UIAutomation to create this proxy.
// returns null if unsuccessful
internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild, int idObject)
{
return Create(hwnd, idChild);
}
internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild)
{
// Something is wrong if idChild is not zero
if (idChild != 0)
{
System.Diagnostics.Debug.Assert (idChild == 0, "Invalid Child Id, idChild != 0");
throw new ArgumentOutOfRangeException("idChild", idChild, SR.Get(SRID.ShouldBeZero));
}
return new WindowsComboBox(hwnd, null, HostedByComboEx(hwnd), idChild);
}
#endregion
//------------------------------------------------------
//
// Pattern Implementation
//
//-----------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider (AutomationPattern iid)
{
if (iid == ValuePattern.Pattern && IsEditableCombo())
{
return this;
}
else if (iid == ExpandCollapsePattern.Pattern && !IsSimpleCombo ())
{
return this;
}
else if (iid == SelectionPattern.Pattern)
{
// delegate work to the WindowsListBox implementation of ISelection
ProxySimple list = CreateListBox ();
if (list != null)
{
ISelectionProvider selection = list.GetPatternProvider (iid) as ISelectionProvider;
if (selection != null)
{
return selection;
}
}
}
//
return null;
}
// Gets the bounding rectangle for this element
internal override Rect BoundingRectangle
{
get
{
NativeMethods.Win32Rect rcCombo = new NativeMethods.Win32Rect (base.BoundingRectangle);
if (GetDroppedState (_hwnd))
{
// NOTE: Do not use CB_GETDROPPEDCONTROLRECT
// it will not produce the correct rect
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
NativeMethods.Win32Rect rcList = NativeMethods.Win32Rect.Empty;
if (!Misc.GetWindowRect(cbInfo.hwndList, ref rcList))
{
return Rect.Empty;
}
if (!Misc.UnionRect(out rcCombo, ref rcCombo, ref rcList))
{
return Rect.Empty;
}
}
}
return rcCombo.ToRect(Misc.IsControlRTL(_hwnd));
}
}
// Process all the Logical and Raw Element Properties
internal override object GetElementProperty (AutomationProperty idProp)
{
if (idProp == AutomationElement.NameProperty)
{
if (Misc.GetClassName(_hwnd).Equals("Internet Explorer_TridentCmboBx"))
{
object result = base.GetElementProperty(idProp);
// Return an empty string instead of null to prevent the default HWND proxy
// from using the window text as the name - since the window text for this owner-
// draw trident combo is garbage.
return result == null ? "" : (string)result;
}
}
// EventManager.DispatchEvent() genericaly uses GetElementProperty()
// to get properties during a property change event. Proccess ExpandCollapseStateProperty
// so the ExpandCollapseStateProperty Change Event can get the correct state.
else if (idProp == ExpandCollapsePattern.ExpandCollapseStateProperty)
{
return ((IExpandCollapseProvider)this).ExpandCollapseState;
}
return base.GetElementProperty (idProp);
}
internal override ProxySimple [] GetEmbeddedFragmentRoots ()
{
// Only applies to drop-down lists, which reparent the list, need to do this...
if (IsSimpleCombo())
return null;
// Because we are moving the listbox portion of the combo from the being a child of the
// desktop to a child of the combo, We have to tell automation the that this is one of our
// children so the listbox will get advised of events added/removed.
return new ProxySimple[] { CreateListBox() };
}
//Gets the localized name
internal override string LocalizedName
{
get
{
// In the case of ComboBoxEx32, this element's _hwnd will be the
// HWND of the ComboBox which is a child of ComboBoxEx the lable that names
// Combobox however is a sibling of ComboBoxEx32, hence we need to handle this case here
if (IsComboBoxEx32())
{
return Misc.GetControlName(Misc.GetLabelhwnd(_hwndEx), true);
}
return null;
}
}
#endregion ProxySimple Interface
#region ProxyFragment Interface
// Returns the next sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null if no next child
internal override ProxySimple GetNextSibling (ProxySimple child)
{
if (child._item == (int) ComboChildren.List && !IsSimpleCombo ())
{
return CreateComboButton ();
}
return null;
}
// Returns the previous sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null is no previous
internal override ProxySimple GetPreviousSibling (ProxySimple child)
{
if (child._item == (int) ComboChildren.Button)
{
return CreateListBox ();
}
return null;
}
// Returns the first child element in the raw hierarchy.
internal override ProxySimple GetFirstChild ()
{
// List portion is a first child of the combo-box
return CreateListBox ();
}
// Returns the last child element in the raw hierarchy.
internal override ProxySimple GetLastChild ()
{
if (IsSimpleCombo ())
{
// there is no DropDown button
return CreateListBox ();
}
return CreateComboButton ();
}
// Returns a Proxy element corresponding to the specified screen coordinates.
internal override ProxySimple ElementProviderFromPoint (int x, int y)
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
// check for button
if (Misc.MapWindowPoints(_hwnd, IntPtr.Zero, ref cbInfo.rcButton, 2))
{
if (Misc.PtInRect(ref cbInfo.rcButton, x, y))
{
return new WindowsComboButton(_hwnd, this, (int)ComboChildren.Button);
}
}
// check for list
if (SafeNativeMethods.IsWindowVisible(cbInfo.hwndList))
{
NativeMethods.Win32Rect rcList = NativeMethods.Win32Rect.Empty;
if (Misc.GetWindowRect(cbInfo.hwndList, ref rcList) &&
Misc.PtInRect(ref rcList, x, y))
{
ProxySimple el = CreateListBox(cbInfo.hwndList);
return ((WindowsListBox) el).ElementProviderFromPoint (x, y);
}
}
}
return this;
}
#endregion
#region ProxyHwnd Interface
// override the default implementation so we can handle the WinEvents that are send to the edit
// portion of ComboBox (Combo proxy will hide edit portion from the user, but will take care of all
// the features/functionality that Edit presents) and some(show, hide) events that are send to the List portion of combo
// In both cases this events will be presented to the user as Combo's LE events
internal override void AdviseEventAdded (AutomationEvent eventId, AutomationProperty [] aidProps)
{
// call the base class implementation first to add combo-specific things and register combo specific callback
base.AdviseEventAdded (eventId, aidProps);
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST are still editable.
if (cbInfo.hwndItem != IntPtr.Zero && IsEditableCombo())
{
// subscribe to edit-specific notifications, that would be presented as combo le event
// ValueAsString, ValueAsObject, IsReadOnly
// create array containing events that user is interested in
WinEventTracker.EvtIdProperty [] editPortionEvents;
int counter;
CreateEditPortionEvents (out editPortionEvents, out counter, aidProps);
if ( counter > 0 )
{
WinEventTracker.AddToNotificationList( cbInfo.hwndItem, new WinEventTracker.ProxyRaiseEvents( EditPortionEvents ), editPortionEvents, counter );
}
}
}
// Need to also advise the list portions of the combobox so that it can raise events.
if (cbInfo.hwndList != IntPtr.Zero)
{
WindowsListBox listbox = new WindowsListBox(cbInfo.hwndList, this, 0, true);
listbox.AdviseEventAdded(eventId, aidProps);
}
}
}
internal override void AdviseEventRemoved (AutomationEvent eventId, AutomationProperty [] aidProps)
{
// remove combo-related events
base.AdviseEventRemoved (eventId, aidProps);
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo))
{
// remove edit and list specific events that got remapped into combo's events
if (eventId == AutomationElement.AutomationPropertyChangedEvent)
{
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST are still editable.
if (cbInfo.hwndItem != IntPtr.Zero && IsEditableCombo())
{
// un-subscribe from edit-specific notifications
// ValueAsString, ValueAsObject, IsReadOnly
// create array containing events from which user wants to unsubscribe
WinEventTracker.EvtIdProperty [] editPortionEvents;
int counter;
CreateEditPortionEvents (out editPortionEvents, out counter, aidProps);
if ( counter > 0 )
{
WinEventTracker.RemoveToNotificationList( cbInfo.hwndItem, editPortionEvents, null, counter );
}
}
}
// Need to also remove the advise from the list portions of the combobox.
if (cbInfo.hwndList != IntPtr.Zero)
{
WindowsListBox listbox = new WindowsListBox(cbInfo.hwndList, this, 0, true);
listbox.AdviseEventRemoved(eventId, aidProps);
}
}
}
#endregion
#region Value Pattern
// Sets the text of the edit part of the Combo
void IValueProvider.SetValue (string str)
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
// piggy-back on win32editbox proxy
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo) && SafeNativeMethods.IsWindowVisible(cbInfo.hwndItem))
{
WindowsEditBox editBox = new WindowsEditBox(cbInfo.hwndItem, null, -1);
IValueProvider valueProvider = (IValueProvider) editBox.GetPatternProvider (ValuePattern.Pattern);
// try to set user-provided text
valueProvider.SetValue (str);
// Let the parent know that the value has change, to allow the parent to do any processing it needs
// to do on value change.
IntPtr hwndParent = Misc.GetParent(_hwnd);
if (hwndParent != IntPtr.Zero)
{
int id = Misc.GetWindowId(_hwnd);
IntPtr wParam = new IntPtr(NativeMethods.Util.MAKELONG(id, NativeMethods.CBN_EDITUPDATE));
Misc.ProxySendMessage(hwndParent, NativeMethods.WM_COMMAND, wParam, _hwnd);
}
return;
}
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
// Request to get the value that this UI element is representing as a string
string IValueProvider.Value
{
get
{
return Text;
}
}
bool IValueProvider.IsReadOnly
{
get
{
if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
{
return true;
}
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST are still editable.
if (IsComboBoxEx32())
{
return false;
}
else
{
return IsDropDownListCombo();
}
}
}
#endregion ValuePattern
#region ExpandCollapse Pattern
void IExpandCollapseProvider.Expand ()
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
if (GetDroppedState (_hwnd))
{
// list portion is already visible
return;
}
Expand (_hwnd);
}
void IExpandCollapseProvider.Collapse ()
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
if (!GetDroppedState (_hwnd))
{
// list portion is already collapsed
return;
}
Collapse(_hwnd);
}
ExpandCollapseState IExpandCollapseProvider.ExpandCollapseState
{
get
{
return (GetDroppedState (_hwnd)) ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed;
}
}
#endregion ExpandCollapse Pattern
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
internal bool IsSimpleCombo ()
{
return (NativeMethods.CBS_SIMPLE == _comboType);
}
// no edit portion....
internal bool IsDropDownListCombo ()
{
return (NativeMethods.CBS_DROPDOWNLIST == _comboType);
}
// get text of the listboxitem (external use)
internal string GetListItemText (int index)
{
IntPtr hwndToAsk = IsComboBoxEx32() ? _hwndEx : _hwnd;
return SpecialText (hwndToAsk, index);
}
// Detect if our combobox is hosted inside of comboex
// This is important to know becuase:
// Real styles will be provided by comboex
// comboex supplies the edit
static internal IntPtr HostedByComboEx (IntPtr hwnd)
{
IntPtr hwndEx = UnsafeNativeMethods.GetAncestor (hwnd, NativeMethods.GA_PARENT);
if ((IntPtr.Zero != hwndEx) && IsComboEx (hwndEx))
{
return hwndEx;
}
return IntPtr.Zero;
}
// Wrapper on top of Win32's GetComboInfo
static internal bool GetComboInfo(IntPtr hwnd, ref NativeMethods.COMBOBOXINFO cbInfo)
{
bool result = Misc.GetComboBoxInfo(hwnd, ref cbInfo);
if (result)
{
// some combo boxes do not have an edit portion
// instead they return combo hwnd in the item
// to make our life easier set hwndItem to IntPtr.Zero
if (cbInfo.hwndItem == cbInfo.hwndCombo)
{
cbInfo.hwndItem = IntPtr.Zero;
}
// Possible that Combo is hosted by ComboboxEx32
// hence GetComboBoxInfo did not provide us with edit.
// We should try to detect it ourselves
if (cbInfo.hwndItem == IntPtr.Zero && IsComboEx (UnsafeNativeMethods.GetAncestor (hwnd, NativeMethods.GA_PARENT)))
{
cbInfo.hwndItem = Misc.FindWindowEx(hwnd, IntPtr.Zero, "EDIT", null);
if (cbInfo.hwndItem != IntPtr.Zero)
{
result = Misc.GetWindowRect(cbInfo.hwndItem, ref cbInfo.rcItem);
if( result)
{
result = Misc.MapWindowPoints(_hwndDesktop, hwnd, ref cbInfo.rcItem, 2);
}
if (!result)
{
cbInfo.rcItem = NativeMethods.Win32Rect.Empty;
}
}
}
}
return result;
}
// determin if the list portion of combo is dropped
static internal bool GetDroppedState (IntPtr hwnd)
{
return Misc.ProxySendMessageInt(hwnd, NativeMethods.CB_GETDROPPEDSTATE, IntPtr.Zero, IntPtr.Zero) != 0;
}
// expand the list portion
static internal void Expand (IntPtr hwnd)
{
IntPtr hwndFocused = Misc.GetFocusedWindow();
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
GetComboInfo(hwnd, ref cbInfo);
// if the combobox does not already have focus, set the focus.
if (hwndFocused != hwnd && hwndFocused != cbInfo.hwndCombo && hwndFocused != cbInfo.hwndItem && hwndFocused != cbInfo.hwndList)
{
Misc.SetFocus(hwnd);
}
Misc.ProxySendMessage(hwnd, NativeMethods.CB_SHOWDROPDOWN, new IntPtr(1), IntPtr.Zero);
}
// collapse the list portion
static internal void Collapse (IntPtr hwnd)
{
Misc.ProxySendMessage(hwnd, NativeMethods.CB_SHOWDROPDOWN, new IntPtr(0), IntPtr.Zero);
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Fields
//
//------------------------------------------------------
#region Internal Fields
// enum describing children of the combobox
internal enum ComboChildren: int
{
Button = -1,
List = 2
}
internal const string Combobox = "ComboBox";
#endregion Internal Fields
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
// retrieve combobox text
private string Text
{
get
{
if (IsDropDownListCombo() && IsComboBoxEx32())
{
// special case ComboboxEx droplist
string text = SpecialText(_hwndEx, -1);
if (!string.IsNullOrEmpty(text))
{
return text;
}
}
// all other cases
return Misc.ProxyGetText(IsComboBoxEx32() ? _hwndEx : _hwnd);
}
}
private int GetComboType()
{
IntPtr hwnd = IsComboBoxEx32() ? _hwndEx : _hwnd;
return (Misc.GetWindowStyle(hwnd) & NativeMethods.CBS_COMBOTYPEMASK);
}
// create combo button
private ProxySimple CreateComboButton ()
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo) && cbInfo.stateButton != NativeMethods.STATE_SYSTEM_INVISIBLE)
{
return new WindowsComboButton (_hwnd, this, (int) ComboChildren.Button);
}
return null;
}
// create list portion of combo box
private ProxySimple CreateListBox()
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (GetComboInfo(_hwnd, ref cbInfo) && (IntPtr.Zero != cbInfo.hwndList))
{
return new WindowsListBox(cbInfo.hwndList, this, (int)ComboChildren.List, true);
}
return null;
}
// create listbox from known hwnd
private ProxySimple CreateListBox (IntPtr hwndList)
{
return new WindowsListBox(hwndList, this, (int)ComboChildren.List, true);
}
// detect if passed int window corresponds to the comboex
static private bool IsComboEx (IntPtr hwndEx)
{
if (hwndEx == IntPtr.Zero)
{
return false;
}
return (0 == String.Compare(Misc.GetClassName(hwndEx), ComboboxEx32, StringComparison.OrdinalIgnoreCase));
}
private bool IsEditableCombo()
{
// Standard Combo Box controls with the style CBS_DROPDOWNLIST has the edit control replaced by a
// static text item to displays the current selection in the list box. This is not true of
// ComboBoxEx32 controls with the style CBS_DROPDOWNLIST.
return !IsDropDownListCombo() || IsComboBoxEx32();
}
// Retrieve the text of the list portion of Combo.
// Or Text of the edit portion of ComboBoxEx32 (path -1 as index)
// Use CB_XXX instead of LB_XXX, since CB_XXX will give us back text in ownerdrawn combo
static private string SpecialText (IntPtr hwnd, int index)
{
if (index == -1)
{
// get the selected element
index = Misc.ProxySendMessageInt(hwnd, NativeMethods.CB_GETCURSEL, IntPtr.Zero, IntPtr.Zero);
if (index == -1)
{
return "";
}
}
int len = Misc.ProxySendMessageInt(hwnd, NativeMethods.CB_GETLBTEXTLEN, new IntPtr(index), IntPtr.Zero);
if (len < 1)
{
return "";
}
if (Misc.GetClassName(hwnd).Equals("Internet Explorer_TridentCmboBx"))
{
// The Trident listbox is a superclassed standard listbox.
// Trident listboxes are owner draw that does not have the hasstring style set.
// All the control contains is the owner draw data and not text. Private
// messages were added to retrieve the owner draw data as text. The new messages
// are used just like the normally LB_GETTEXT and CB_GETTEXT messages.
return XSendMessage.GetItemText(hwnd, NativeMethods.WM_USER + NativeMethods.CB_GETLBTEXT, index, len);
}
else
{
return Misc.GetUnsafeText(hwnd, NativeMethods.CB_GETLBTEXT, new IntPtr(index), len);
}
}
// Combo-specific events
static private void RaiseEvents (IntPtr hwnd, int eventId, object idProp, int idObject, int idChild)
{
// -----------------------------------------------------/////////////////////////////////////
//
// Depending of the type of Combobox we will get different WinEvents
//
// Simple: No events
//
// DropDown: OBJ_STATECHANGE: for the dropbutton button (idChild == 2)
// NOTE: that OBJECT_STATECHANGE will only be generated when user uses button to show the list
// if user uses the button to hide the list, event will not be generated
//
// DropDownList: OBJ_STATECHANGE (same as above)
// : OBJECT_VALUECHANGE - when using the keyboard to navigate between list children
// - no need to handle it here, ListBox proxy will take care of that
//
// ------------------------------------------------------//////////////////////////////////////
ProxySimple el = null;
if (idProp is AutomationProperty && idProp == ExpandCollapsePattern.ExpandCollapseStateProperty)
{
// expand/collapse events are handled in WindowsListBox with the ComboLBox hwnd.
// so just return here so we don't fire extraneous events
return;
}
switch (idObject)
{
case NativeMethods.OBJID_CLIENT :
{
if (eventId == NativeMethods.EventObjectStateChange && idChild == 2)
{
// event came for combobutton
// We will be getting 2 OBJECT_STATECHANGED event
// one with button state pressed and another normal
// both indicate the same invoke event
// hence second event is a duplicate of the first one and we need to filter it out
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (WindowsComboBox.GetComboInfo(hwnd, ref cbInfo) && Misc.IsBitSet(NativeMethods.STATE_SYSTEM_PRESSED, cbInfo.stateButton))
{
// The event could be for both the button and the combo
WindowsComboBox cb = (WindowsComboBox) Create (hwnd, 0);
cb.DispatchEvents (eventId, idProp, idObject, idChild);
el = cb.CreateComboButton ();
el.DispatchEvents (eventId, idProp, idObject, idChild);
return;
}
}
el = (ProxySimple) Create (hwnd, 0);
break;
}
}
if (el != null)
{
el.DispatchEvents (eventId, idProp, idObject, idChild);
}
}
// Handles combo's edit portion specific events
// as combo-specific events
private static void EditPortionEvents (IntPtr hwnd, int eventId, object idProp, int idObject, int idChild)
{
// Get hwnd of the combo-box
IntPtr hwndCombo = UnsafeNativeMethods.GetAncestor (hwnd, NativeMethods.GA_PARENT);
if (hwndCombo != IntPtr.Zero)
{
ProxySimple el = (ProxySimple) Create (hwndCombo, 0);
el.DispatchEvents (eventId, idProp, idObject, idChild);
}
}
// Return an array that contains combo's edit portion specific events
// These events will be remapped as combo box events
private static void CreateEditPortionEvents (out WinEventTracker.EvtIdProperty [] editPortionEvents, out int counter, AutomationProperty [] aidProps)
{
// count how many events to pass back for the edit part of combo
int c = 0;
foreach ( AutomationProperty p in aidProps )
{
if ( p == ValuePattern.ValueProperty || p == ValuePattern.IsReadOnlyProperty )
{
c++;
}
}
if (c == 0)
{
editPortionEvents = null;
counter = 0;
return;
}
// allocate array with the number of events from above
editPortionEvents = new WinEventTracker.EvtIdProperty[c];
c = 0;
foreach ( AutomationProperty p in aidProps )
{
if ( p == ValuePattern.ValueProperty || p == ValuePattern.IsReadOnlyProperty )
{
editPortionEvents[c]._idProp = p;
editPortionEvents[c]._evtId = (p == ValuePattern.ValueProperty) ? NativeMethods.EventObjectValueChange : NativeMethods.EventObjectStateChange;
c++;
}
}
counter = c;
}
// When _hwndEx is not IntPtr.Zero the control is a ComboBoxEx32 control.
private bool IsComboBoxEx32()
{
return _hwndEx != IntPtr.Zero;
}
#endregion Private Methods
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private fields
// HWND of ComboBoxEx32 (if exist)
private IntPtr _hwndEx;
private int _comboType;
private const string ComboboxEx32 = "ComboBoxEx32";
#endregion Private fields
//------------------------------------------------------
//
// WindowsComboButton Private Class
//
//-----------------------------------------------------
#region WindowsComboButton
// Proxy for ComboBox button
class WindowsComboButton: ProxySimple, IInvokeProvider
{
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructor
internal WindowsComboButton (IntPtr hwnd, ProxyFragment parent, int item)
: base(hwnd, parent, item)
{
_cControlType = ControlType.Button;
_sAutomationId = "DropDown"; // This string is a non-localizable string
}
#endregion Constructor
//-----------------------------------------------------
//
// Pattern Implementation
//
//-----------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider (AutomationPattern iid)
{
if (iid == InvokePattern.Pattern)
{
return this;
}
return null;
}
// Gets the bounding rectangle for this element
internal override Rect BoundingRectangle
{
get
{
NativeMethods.COMBOBOXINFO cbInfo = new NativeMethods.COMBOBOXINFO(NativeMethods.comboboxInfoSize);
if (!WindowsComboBox.GetComboInfo(_hwnd, ref cbInfo))
{
return Rect.Empty;
}
if (!Misc.MapWindowPoints(_hwnd, IntPtr.Zero, ref cbInfo.rcButton, 2))
{
return Rect.Empty;
}
return cbInfo.rcButton.ToRect(Misc.IsControlRTL(_hwnd));
}
}
//Gets the localized name
internal override string LocalizedName
{
get
{
return ST.Get(STID.LocalizedNameWindowsComboButton);
}
}
#endregion ProxySimple Interface
#region Invoke Pattern
// Same effect as a click on the drop down button
void IInvokeProvider.Invoke ()
{
// Ensure that the window and all its parents are enabled.
Misc.CheckEnabled(_hwnd);
if (!WindowsComboBox.GetDroppedState (_hwnd))
{
WindowsComboBox.Expand (_hwnd);
}
else
{
WindowsComboBox.Collapse (_hwnd);
}
}
#endregion Invoke Pattern
}
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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