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//---------------------------------------------------------------------------
//
// <copyright file="WindowsListViewItemStartMenu.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
//
// Description: Win32 ListView Item proxy for the Start Menu.
// The Start Menu has a special use of ListViews. The items in the
// list are treated like menuitems. To expose this special behavor
// data from MSAA is need. The Shell team has implemented a special
// IAccessible to support the Sart Menu.
//
// History:
// 2005/01/25 - Microsoft - Created
//
//---------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows;
using Accessibility;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
// This class will only change a couple of aspects of a ListViewItem. So derive from the ListViewItem to
// retain the majority of the ListView item functionality.
internal class ListViewItemStartMenu : ListViewItem
{
// ------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
internal ListViewItemStartMenu(IntPtr hwnd, ProxyFragment parent, int item, IAccessible acc)
: base (hwnd, parent, item)
{
// The items are zero based, i.e. the first listview item is item 0. The
// zero item in MSAA is self, so need to add one to the item to get the
// correct Accessible child.
AccessibleRole role = Accessible.GetRole(acc, item + 1);
// Normal Listview items should be of control type listitem. But
// the Listview items in the Start Menu act like menuitems. Get the Role
// from IAccessible interface implemented by the Shell team and set the
// control type.
if (role == AccessibleRole.MenuItem)
{
_cControlType = ControlType.MenuItem;
}
else
{
System.Diagnostics.Debug.Assert(false, "The listview item on the Start Menu has an unexpected IAccessible role!");
}
}
#endregion Constructos
//------------------------------------------------------
//
// Patterns Implementation
//
//------------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider(AutomationPattern iid)
{
// Treate these listview items as menuitems and only support Invoke or Expand/Collapse patterns.
// Invoke Pattern needs to be supported when the item has no children. When the item does have
// children it needs to support ExpandCollapse Pattern.
if (iid == InvokePattern.Pattern)
{
return this;
}
//
return null;
}
// Process all the Logical and Raw Element Properties
internal override object GetElementProperty(AutomationProperty idProp)
{
// Normal Listview items do not have a concept of an AccessKey. But
// the Listview items in the Start Menu does. This information is
// in the IAccessible interface implemented by the Shell team.
if (idProp == AutomationElement.AccessKeyProperty)
{
// The IAccessible should be valid here since it is the cached value in ProxySimple.
System.Diagnostics.Debug.Assert(AccessibleObject != null, "Failed to get a valid IAccessible!");
try
{
string key = AccessibleObject.get_accKeyboardShortcut(_item + 1);
if (!string.IsNullOrEmpty(key))
{
return ST.Get(STID.KeyAlt) + "+" + key;
}
}
catch (Exception e)
{
if (Misc.IsCriticalException(e))
{
throw;
}
}
}
else if (idProp == AutomationElement.HasKeyboardFocusProperty)
{
return IsFocused();
}
return base.GetElementProperty(idProp);
}
#endregion
}
}
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