Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Automation / Peers / MenuItemAutomationPeer.cs / 1 / MenuItemAutomationPeer.cs
using System; using System.Collections; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Security; using System.Text; using System.Windows; using System.Windows.Automation.Provider; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Interop; using System.Windows.Media; using MS.Internal; using MS.Win32; namespace System.Windows.Automation.Peers { /// public class MenuItemAutomationPeer : FrameworkElementAutomationPeer, IExpandCollapseProvider, IInvokeProvider, IToggleProvider { /// public MenuItemAutomationPeer(MenuItem owner): base(owner) { } /// override protected string GetClassNameCore() { return "MenuItem"; } /// override protected AutomationControlType GetAutomationControlTypeCore() { return AutomationControlType.MenuItem; } /// override public object GetPattern(PatternInterface patternInterface) { object result = null; MenuItem owner = (MenuItem)Owner; if (patternInterface == PatternInterface.ExpandCollapse) { MenuItemRole role = owner.Role; if ( (role == MenuItemRole.TopLevelHeader || role == MenuItemRole.SubmenuHeader) && owner.HasItems) { result = this; } } else if (patternInterface == PatternInterface.Toggle) { if (owner.IsCheckable) { result = this; } } else if (patternInterface == PatternInterface.Invoke) { MenuItemRole role = owner.Role; if ( (role == MenuItemRole.TopLevelItem || role == MenuItemRole.SubmenuItem) && !owner.HasItems) { result = this; } } return result; } /// override protected string GetAccessKeyCore() { string accessKey = base.GetAccessKeyCore(); if (!string.IsNullOrEmpty(accessKey)) { MenuItem menuItem = (MenuItem)Owner; MenuItemRole role = menuItem.Role; if (role == MenuItemRole.TopLevelHeader || role == MenuItemRole.TopLevelItem) { accessKey = "Alt+" + accessKey; } } return accessKey; } // MenuItem cannot rely on the base which gets the visal children because submenu items are part of // other visual tree under a Popup. // We return the list of items containers if they are currently visible // In case MenuItem is not expanded we return null /// protected override ListGetChildrenCore() { List children = null; if (ExpandCollapseState.Expanded == ((IExpandCollapseProvider)this).ExpandCollapseState) { ItemsControl owner = (ItemsControl)Owner; ItemCollection items = owner.Items; if (items.Count > 0) { children = new List (items.Count); for (int i = 0; i < items.Count; i++) { UIElement uiElement = owner.ItemContainerGenerator.ContainerFromIndex(i) as UIElement; if (uiElement != null) { AutomationPeer peer = UIElementAutomationPeer.FromElement(uiElement); if (peer == null) peer = UIElementAutomationPeer.CreatePeerForElement(uiElement); children.Add(peer); } } } } return children; } /// void IExpandCollapseProvider.Expand() { if(!IsEnabled()) throw new ElementNotEnabledException(); MenuItem owner = (MenuItem)Owner; MenuItemRole role = owner.Role; if ( (role != MenuItemRole.TopLevelHeader && role != MenuItemRole.SubmenuHeader) || !owner.HasItems) { throw new InvalidOperationException(SR.Get(SRID.UIA_OperationCannotBePerformed)); } owner.OpenMenu(); } /// void IExpandCollapseProvider.Collapse() { if(!IsEnabled()) throw new ElementNotEnabledException(); MenuItem owner = (MenuItem)Owner; MenuItemRole role = owner.Role; if ( (role != MenuItemRole.TopLevelHeader && role != MenuItemRole.SubmenuHeader) || !owner.HasItems) { throw new InvalidOperationException(SR.Get(SRID.UIA_OperationCannotBePerformed)); } owner.IsSubmenuOpen = false; } /// ExpandCollapseState IExpandCollapseProvider.ExpandCollapseState { get { ExpandCollapseState result = ExpandCollapseState.Collapsed; MenuItem owner = (MenuItem)Owner; MenuItemRole role = owner.Role; if (role == MenuItemRole.TopLevelItem || role == MenuItemRole.SubmenuItem || !owner.HasItems) { result = ExpandCollapseState.LeafNode; } else if (owner.IsSubmenuOpen) { result = ExpandCollapseState.Expanded; } return result; } } /// void IInvokeProvider.Invoke() { if(!IsEnabled()) throw new ElementNotEnabledException(); MenuItem owner = (MenuItem)Owner; MenuItemRole role = owner.Role; if (role == MenuItemRole.TopLevelItem || role == MenuItemRole.SubmenuItem) { owner.ClickItem(); } else if (role == MenuItemRole.TopLevelHeader || role == MenuItemRole.SubmenuHeader) { owner.ClickHeader(); } } /// void IToggleProvider.Toggle() { if(!IsEnabled()) throw new ElementNotEnabledException(); MenuItem owner = (MenuItem)Owner; if (!owner.IsCheckable) { throw new InvalidOperationException(SR.Get(SRID.UIA_OperationCannotBePerformed)); } owner.IsChecked = !owner.IsChecked; } /// ToggleState IToggleProvider.ToggleState { get { MenuItem owner = (MenuItem)Owner; return owner.IsChecked ? ToggleState.On : ToggleState.Off; } } /// // [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)] internal void RaiseExpandCollapseAutomationEvent(bool oldValue, bool newValue) { RaisePropertyChangedEvent( ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty, oldValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed, newValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed); } // Return the base without the AccessKey character /// override protected string GetNameCore() { string result = base.GetNameCore(); if (!string.IsNullOrEmpty(result)) { MenuItem menuItem = (MenuItem)Owner; if (menuItem.Header is string) { return AccessText.RemoveAccessKeyMarker(result); } } return result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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