MenuCommandService.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / CompMod / System / ComponentModel / Design / MenuCommandService.cs / 1 / MenuCommandService.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.ComponentModel.Design {
 

    using Microsoft.Win32;
    using System;
    using System.Design; 
    using System.Collections;
    using System.ComponentModel; 
    using System.ComponentModel.Design; 
    using System.Diagnostics;
    using System.Globalization; 

    using IServiceProvider = System.IServiceProvider;

    ///  
    /// 
    ///     The menu command service allows designers to add and respond to 
    ///     menu and toolbar items.  It is based on two interfaces.  Designers 
    ///     request IMenuCommandService to add menu command handlers, while
    ///     the document or tool window forwards IOleCommandTarget requests 
    ///     to this object.
    /// 
    public class MenuCommandService : IMenuCommandService, IDisposable {
 
        private IServiceProvider                    _serviceProvider;
        private Hashtable                           _commandGroups; 
        private EventHandler                        _commandChangedHandler; 
        private MenuCommandsChangedEventHandler     _commandsChangedHandler;
        private ArrayList                           _globalVerbs; 
        private ISelectionService                   _selectionService;

        internal static TraceSwitch MENUSERVICE = new TraceSwitch("MENUSERVICE", "MenuCommandService: Track menu command routing");
 
        // This is the set of verbs we offer through the Verbs property.
        // It consists of the global verbs + any verbs that the currently 
        // selected designer wants to offer.  This collection changes with the 
        // current selection.
        // 
        private DesignerVerbCollection          _currentVerbs;

        // this is the type that we last picked up verbs from
        // so we know when we need to refresh 
        //
        private Type                            _verbSourceType; 
 
        /// 
        ///  
        ///     Creates a new menu command service.
        /// 
        public MenuCommandService(IServiceProvider serviceProvider) {
            _serviceProvider = serviceProvider; 
            _commandGroups = new Hashtable();
            _commandChangedHandler = new EventHandler(this.OnCommandChanged); 
            TypeDescriptor.Refreshed += new RefreshEventHandler(this.OnTypeRefreshed); 
        }
 

        /// 
        /// 
        ///     This event is thrown whenever a MenuCommand is removed 
        ///     or added
        ///  
        public event MenuCommandsChangedEventHandler MenuCommandsChanged { 
            add {
                _commandsChangedHandler += value; 
            }
            remove {
                _commandsChangedHandler -= value;
            } 
        }
 
        ///  
        /// 
        ///      Retrieves a set of verbs that are global to all objects on the design 
        ///      surface.  This set of verbs will be merged with individual component verbs.
        ///      In the case of a name conflict, the component verb will NativeMethods.
        /// 
        public virtual DesignerVerbCollection Verbs { 
            get {
                EnsureVerbs(); 
                return _currentVerbs; 
            }
        } 

        /// 
        /// 
        ///     Adds a menu command to the document.  The menu command must already exist 
        ///     on a menu; this merely adds a handler for it.
        ///  
        public virtual void AddCommand(MenuCommand command) { 

            if (command == null) { 
                throw new ArgumentNullException("command");
            }

            // If the command already exists, it is an error to add 
            // a duplicate.
            // 
            if (((IMenuCommandService)this).FindCommand(command.CommandID) != null) { 
                throw new ArgumentException(SR.GetString(SR.MenuCommandService_DuplicateCommand, command.CommandID.ToString()));
            } 


            ArrayList commandsList = _commandGroups[command.CommandID.Guid] as ArrayList;
            if (null == commandsList) 
            {
                commandsList = new ArrayList(); 
                commandsList.Add(command); 
                _commandGroups.Add(command.CommandID.Guid, commandsList);
            } 
            else
            {
                commandsList.Add(command);
            } 

 
 
            command.CommandChanged += _commandChangedHandler;
            Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "Command added: " + command.ToString()); 

            //fire event
            OnCommandsChanged(new MenuCommandsChangedEventArgs(MenuCommandsChangedType.CommandAdded, command));
        } 

        ///  
        ///  
        ///      Adds a verb to the set of global verbs.  Individual components should
        ///      use the Verbs property of their designer, rather than call this method. 
        ///      This method is intended for objects that want to offer a verb that is
        ///      available regardless of what components are selected.
        /// 
        public virtual void AddVerb(DesignerVerb verb) { 

            if (verb == null) { 
                throw new ArgumentNullException("verb"); 
            }
 
            if (_globalVerbs == null) {
                _globalVerbs = new ArrayList();
            }
 
            _globalVerbs.Add(verb);
            OnCommandsChanged(new MenuCommandsChangedEventArgs(MenuCommandsChangedType.CommandAdded, verb)); 
            EnsureVerbs(); 
            if (!((IMenuCommandService)this).Verbs.Contains(verb)) {
                ((IMenuCommandService)this).Verbs.Add(verb); 
            }

            /*
 

 
 

 



 

 
 

 
*/
        }

        ///  
        /// 
        ///     Disposes of this service. 
        ///  
        public void Dispose() {
            Dispose(true); 
        }

        /// 
        ///  
        ///     Disposes of this service.
        ///  
        protected virtual void Dispose(bool disposing) { 

            if (disposing) { 
                if (_selectionService != null) {
                    _selectionService.SelectionChanging -= new EventHandler(this.OnSelectionChanging);
                    _selectionService = null;
                } 

                if (_serviceProvider != null) { 
                    _serviceProvider = null; 
                    TypeDescriptor.Refreshed -= new RefreshEventHandler(this.OnTypeRefreshed);
                } 

                IDictionaryEnumerator groupsEnum = _commandGroups.GetEnumerator();
                while(groupsEnum.MoveNext()) {
                    ArrayList commands = (ArrayList)groupsEnum.Value; 
                    foreach(MenuCommand command in commands) {
                        command.CommandChanged -= _commandChangedHandler; 
                    } 
                    commands.Clear();
                } 
            }
        }

        ///  
        /// 
        ///      Ensures that the verb list has been created. 
        ///  
        protected void EnsureVerbs() {
 
            // We apply global verbs only if the base component is the
            // currently selected object.
            //
            bool useGlobalVerbs = false; 

            if (_currentVerbs == null && _serviceProvider != null) { 
                Hashtable buildVerbs = null; 
                ArrayList verbsOrder;
 
                if (_selectionService == null) {
                    _selectionService = GetService(typeof(ISelectionService)) as ISelectionService;

                    if (_selectionService != null) { 
                        _selectionService.SelectionChanging += new EventHandler(this.OnSelectionChanging);
                    } 
                } 

                int verbCount = 0; 
                DesignerVerbCollection localVerbs = null;
                DesignerVerbCollection designerActionVerbs = new DesignerVerbCollection(); // we instanciate this one here...
                IDesignerHost designerHost = GetService(typeof(IDesignerHost)) as IDesignerHost;
 
                if (_selectionService != null && designerHost != null && _selectionService.SelectionCount == 1) {
                    object selectedComponent = _selectionService.PrimarySelection; 
                    if (selectedComponent is IComponent && 
                        !TypeDescriptor.GetAttributes(selectedComponent).Contains(InheritanceAttribute.InheritedReadOnly)) {
 
                        useGlobalVerbs = (selectedComponent == designerHost.RootComponent);

                        // LOCAL VERBS
                        IDesigner designer = designerHost.GetDesigner((IComponent)selectedComponent); 
                        if (designer != null) {
                            localVerbs = designer.Verbs; 
                            if (localVerbs != null) { 
                                verbCount += localVerbs.Count;
                                _verbSourceType = selectedComponent.GetType(); 
                            }
                            else {
                                _verbSourceType = null;
                            } 
                        }
 
                        // DesignerAction Verbs 
                        DesignerActionService daSvc = GetService(typeof(DesignerActionService)) as DesignerActionService;
                        if(daSvc != null) { 
                            DesignerActionListCollection actionLists = daSvc.GetComponentActions(selectedComponent as IComponent);
                            if(actionLists != null) {
                                foreach(DesignerActionList list in actionLists) {
                                    DesignerActionItemCollection dai = list.GetSortedActionItems(); 
                                    if(dai != null) {
                                        for(int i = 0; i< dai.Count; i++ ) { 
                                            DesignerActionMethodItem dami = dai[i] as DesignerActionMethodItem; 
                                            if(dami != null && dami.IncludeAsDesignerVerb) {
                                                EventHandler handler = new EventHandler(dami.Invoke); 
                                                DesignerVerb verb = new DesignerVerb(dami.DisplayName, handler);
                                                designerActionVerbs.Add(verb);
                                                verbCount++;
                                            } 
                                        }
                                    } 
                                } 
                            }
                        } 
                    }
                }

 
                // GLOBAL VERBS
                if (useGlobalVerbs && _globalVerbs == null) { 
                    useGlobalVerbs = false; 
                }
 
                if (useGlobalVerbs) {
                    verbCount += _globalVerbs.Count;
                }
 

                // merge all 
                buildVerbs = new Hashtable(verbCount, StringComparer.OrdinalIgnoreCase); 
                verbsOrder = new ArrayList(verbCount);
 
                // PRIORITY ORDER FROM HIGH TO LOW: LOCAL VERBS - DESIGNERACTION VERBS - GLOBAL VERBS
                if (useGlobalVerbs) {
                    for(int i=0;i<_globalVerbs.Count;i++) {
                        string key = ((DesignerVerb)_globalVerbs[i]).Text; 
                        buildVerbs[key] = verbsOrder.Add(_globalVerbs[i]);
                    } 
                } 
                if(designerActionVerbs.Count > 0) {
                    for(int i=0;i 0) {
                    for(int i=0;i
        /// 
        ///     Searches for the given command ID and returns the MenuCommand
        ///     associated with it. 
        /// 
        public MenuCommand FindCommand(CommandID commandID) { 
            return FindCommand(commandID.Guid, commandID.ID); 
        }
 
        /// 
        /// 
        ///     Locates the requested command. This will throw an appropriate
        ///     ComFailException if the command couldn't be found. 
        /// 
        protected MenuCommand FindCommand(Guid guid, int id) { 
            Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "MCS Searching for command: " + guid.ToString() + " : " + id.ToString(CultureInfo.CurrentCulture)); 

            // Search in the list of commands only if the command group is known 
            ArrayList commands = _commandGroups[guid] as ArrayList;
            if(null != commands) {
                Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "\t...MCS Found group");
                foreach(MenuCommand command in commands) { 
                    if(command.CommandID.ID == id) {
                        Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "\t... MCS Found Command"); 
                        return command; 
                    }
                } 
            }

            // Next, search the verb list as well.
            // 
            EnsureVerbs();
            if (_currentVerbs != null) { 
                int currentID = StandardCommands.VerbFirst.ID; 
                foreach (DesignerVerb verb in _currentVerbs) {
                    CommandID cid = verb.CommandID; 

                    if (cid.ID == id) {
                        Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "\t...MCS Found verb");
 
                        if (cid.Guid.Equals(guid)) {
                            Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "\t...MCS Found group"); 
                            return verb; 
                        }
                    } 

                    // We assign virtual sequential IDs to verbs we get from the component. This allows users
                    // to not worry about assigning these IDs themselves.
                    // 
                    if (currentID == id) {
                        Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "\t...MCS Found verb"); 
 
                        if (cid.Guid.Equals(guid)) {
                            Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "\t...MCS Found group"); 
                            return verb;
                        }
                    }
 
                    if (cid.Equals(StandardCommands.VerbFirst))
                        currentID++; 
                } 
            }
 
            return null;
        }

        ///  
        /// 
        ///     Get the command list for a given GUID 
        ///  
        protected ICollection GetCommandList(Guid guid) {
            return (_commandGroups[guid] as ArrayList); 
        }

        /// 
        ///  
        /// 
        protected object GetService(Type serviceType) { 
            if (serviceType == null) { 
                throw new ArgumentNullException("serviceType");
            } 
            if (_serviceProvider != null) {
                return _serviceProvider.GetService(serviceType);
            }
            return null; 
        }
 
        ///  
        /// 
        ///     Invokes a command on the local form or in the global environment. 
        ///     The local form is first searched for the given command ID.  If it is
        ///     found, it is invoked.  Otherwise the the command ID is passed to the
        ///     global environment command handler, if one is available.
        ///  
        public virtual bool GlobalInvoke(CommandID commandID) {
 
            // try to find it locally 
            MenuCommand cmd = ((IMenuCommandService)this).FindCommand(commandID);
            if (cmd != null) { 
                cmd.Invoke();
                return true;
            }
            return false; 
        }
 
        ///  
        /// 
        ///     Invokes a command on the local form or in the global environment. 
        ///     The local form is first searched for the given command ID.  If it is
        ///     found, it is invoked.  Otherwise the the command ID is passed to the
        ///     global environment command handler, if one is available.
        ///  
        public virtual bool GlobalInvoke(CommandID commandId, object arg) {
 
            // try to find it locally 
            MenuCommand cmd = ((IMenuCommandService)this).FindCommand(commandId);
            if (cmd != null) { 
                cmd.Invoke(arg);
                return true;
            }
            return false; 
        }
 
        ///  
        /// 
        ///     This is called by a menu command when it's status has changed. 
        /// 
        private void OnCommandChanged(object sender, EventArgs e) {
            Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "Command dirty: " + ((sender != null) ? sender.ToString() : "(null sender)" ));
            OnCommandsChanged(new MenuCommandsChangedEventArgs(MenuCommandsChangedType.CommandChanged, (MenuCommand)sender)); 
        }
 
        ///  
        /// 
        /// 
        /// 
        protected virtual void OnCommandsChanged(MenuCommandsChangedEventArgs e) {
            if (_commandsChangedHandler != null) {
                _commandsChangedHandler(this, e); 
            }
        } 
 
        /// 
        ///  
        ///     Called by TypeDescriptor when a type changes.  If this type is currently holding
        ///     our verb, invalidate the list.
        /// 
        private void OnTypeRefreshed(RefreshEventArgs e) { 
            if (_verbSourceType != null && _verbSourceType.IsAssignableFrom(e.TypeChanged)) {
                _currentVerbs = null; 
            } 
        }
 
        /// 
        /// 
        ///      This is called by the selection service when the selection has changed.  Here
        ///      we invalidate our verb list. 
        /// 
        private void OnSelectionChanging(object sender, EventArgs e) { 
            if (_currentVerbs != null) { 
                _currentVerbs = null;
                OnCommandsChanged(new MenuCommandsChangedEventArgs(MenuCommandsChangedType.CommandChanged, null)); 
            }
        }

        ///  
        /// 
        ///     Removes the given menu command from the document. 
        ///  
        public virtual void RemoveCommand(MenuCommand command) {
 
            if (command == null) {
                throw new ArgumentNullException("command");
            }
            ArrayList commands = _commandGroups[command.CommandID.Guid] as ArrayList; 
            if (null != commands)
            { 
                int index = commands.IndexOf(command); 
                if (-1 != index)
                { 
                    commands.RemoveAt(index);
                    // If there are no more commands in this command group, remove the group
                    if (commands.Count == 0)
                    { 
                        _commandGroups.Remove(command.CommandID.Guid);
                    } 
 

                    command.CommandChanged -= _commandChangedHandler; 

                    Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "Command removed: " + command.ToString());

                    //fire event 
                    OnCommandsChanged(new MenuCommandsChangedEventArgs(MenuCommandsChangedType.CommandRemoved, command));
                } 
                return; 
            }
 
            Debug.WriteLineIf(MENUSERVICE.TraceVerbose, "Unable to remove command: " + command.ToString());
        }

        ///  
        /// 
        ///     Removes the given verb from the document. 
        ///  
        public virtual void RemoveVerb(DesignerVerb verb) {
 
            if (verb == null) {
                throw new ArgumentNullException("verb");
            }
 
            if (_globalVerbs != null) {
                int index = _globalVerbs.IndexOf(verb); 
                if (index != -1) { 
                    _globalVerbs.RemoveAt(index);
                    EnsureVerbs(); 
                    if (((IMenuCommandService)this).Verbs.Contains(verb)) {
                        ((IMenuCommandService)this).Verbs.Remove(verb);
                    }
                    OnCommandsChanged(new MenuCommandsChangedEventArgs(MenuCommandsChangedType.CommandRemoved, verb)); 
                }
            } 
 
            /*
 



 

 
 

 



 

*/ 
        } 

        ///  
        /// 
        ///     Shows the context menu with the given command ID at the given
        ///     location.
        ///  
        public virtual void ShowContextMenu(CommandID menuID, int x, int y) {
        } 
 
    }
} 



// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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