Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / Command.cs / 1305376 / Command.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.ComponentModel; using System.Windows.Forms; using System.Drawing; using Microsoft.Win32; ////// internal class Command : WeakReference { private static Command[] cmds; private static int icmdTry; private static object internalSyncObject = new object(); private const int idMin = 0x00100; private const int idLim = 0x10000; internal int id; public Command(ICommandExecutor target) : base(target, false) { AssignID(this); } public virtual int ID { get { return id; } } [SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods")] protected static void AssignID(Command cmd) { lock(internalSyncObject) { int icmd; if (null == cmds) { cmds = new Command[20]; icmd = 0; } else { Debug.Assert(cmds.Length > 0, "why is cmds.Length zero?"); Debug.Assert(icmdTry >= 0, "why is icmdTry negative?"); int icmdLim = cmds.Length; if (icmdTry >= icmdLim) icmdTry = 0; // First look for an empty slot (starting at icmdTry). for (icmd = icmdTry; icmd < icmdLim; icmd++) if (null == cmds[icmd]) goto FindSlotComplete; for (icmd = 0; icmd < icmdTry; icmd++) if (null == cmds[icmd]) goto FindSlotComplete; // All slots have Command objects in them. Look for a command // with a null referent. for (icmd = 0; icmd < icmdLim; icmd++) if (null == cmds[icmd].Target) goto FindSlotComplete; // Grow the array. icmd = cmds.Length; icmdLim = Math.Min(idLim - idMin, 2 * icmd); if (icmdLim <= icmd) { // Already at maximal size. Do a garbage collect and look again. GC.Collect(); for (icmd = 0; icmd < icmdLim; icmd++) { if (null == cmds[icmd] || null == cmds[icmd].Target) goto FindSlotComplete; } throw new ArgumentException(SR.GetString(SR.CommandIdNotAllocated)); } else { Command[] newCmds = new Command[icmdLim]; Array.Copy(cmds, 0, newCmds, 0, icmd); cmds = newCmds; } } FindSlotComplete: cmd.id = icmd + idMin; Debug.Assert(cmd.id >= idMin && cmd.id < idLim, "generated command id out of range"); cmds[icmd] = cmd; icmdTry = icmd + 1; } } public static bool DispatchID(int id) { Command cmd = GetCommandFromID(id); if (null == cmd) return false; return cmd.Invoke(); } protected static void Dispose(Command cmd) { lock (internalSyncObject) { if (cmd.id >= idMin) { cmd.Target = null; if (cmds[cmd.id - idMin] == cmd) cmds[cmd.id - idMin] = null; cmd.id = 0; } } } public virtual void Dispose() { if (id >= idMin) Dispose(this); } public static Command GetCommandFromID(int id) { lock (internalSyncObject) { if (null == cmds) return null; int i = id - idMin; if (i < 0 || i >= cmds.Length) return null; return cmds[i]; } } public virtual bool Invoke() { object target = Target; if (!(target is ICommandExecutor)) return false; ((ICommandExecutor)target).Execute(); return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.ComponentModel; using System.Windows.Forms; using System.Drawing; using Microsoft.Win32; ////// internal class Command : WeakReference { private static Command[] cmds; private static int icmdTry; private static object internalSyncObject = new object(); private const int idMin = 0x00100; private const int idLim = 0x10000; internal int id; public Command(ICommandExecutor target) : base(target, false) { AssignID(this); } public virtual int ID { get { return id; } } [SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods")] protected static void AssignID(Command cmd) { lock(internalSyncObject) { int icmd; if (null == cmds) { cmds = new Command[20]; icmd = 0; } else { Debug.Assert(cmds.Length > 0, "why is cmds.Length zero?"); Debug.Assert(icmdTry >= 0, "why is icmdTry negative?"); int icmdLim = cmds.Length; if (icmdTry >= icmdLim) icmdTry = 0; // First look for an empty slot (starting at icmdTry). for (icmd = icmdTry; icmd < icmdLim; icmd++) if (null == cmds[icmd]) goto FindSlotComplete; for (icmd = 0; icmd < icmdTry; icmd++) if (null == cmds[icmd]) goto FindSlotComplete; // All slots have Command objects in them. Look for a command // with a null referent. for (icmd = 0; icmd < icmdLim; icmd++) if (null == cmds[icmd].Target) goto FindSlotComplete; // Grow the array. icmd = cmds.Length; icmdLim = Math.Min(idLim - idMin, 2 * icmd); if (icmdLim <= icmd) { // Already at maximal size. Do a garbage collect and look again. GC.Collect(); for (icmd = 0; icmd < icmdLim; icmd++) { if (null == cmds[icmd] || null == cmds[icmd].Target) goto FindSlotComplete; } throw new ArgumentException(SR.GetString(SR.CommandIdNotAllocated)); } else { Command[] newCmds = new Command[icmdLim]; Array.Copy(cmds, 0, newCmds, 0, icmd); cmds = newCmds; } } FindSlotComplete: cmd.id = icmd + idMin; Debug.Assert(cmd.id >= idMin && cmd.id < idLim, "generated command id out of range"); cmds[icmd] = cmd; icmdTry = icmd + 1; } } public static bool DispatchID(int id) { Command cmd = GetCommandFromID(id); if (null == cmd) return false; return cmd.Invoke(); } protected static void Dispose(Command cmd) { lock (internalSyncObject) { if (cmd.id >= idMin) { cmd.Target = null; if (cmds[cmd.id - idMin] == cmd) cmds[cmd.id - idMin] = null; cmd.id = 0; } } } public virtual void Dispose() { if (id >= idMin) Dispose(this); } public static Command GetCommandFromID(int id) { lock (internalSyncObject) { if (null == cmds) return null; int i = id - idMin; if (i < 0 || i >= cmds.Length) return null; return cmds[i]; } } public virtual bool Invoke() { object target = Target; if (!(target is ICommandExecutor)) return false; ((ICommandExecutor)target).Execute(); return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- StretchValidation.cs
- MdiWindowListItemConverter.cs
- RoleServiceManager.cs
- MailWriter.cs
- EventHandlersDesigner.cs
- OrderedDictionary.cs
- ChangeNode.cs
- ObjectDataSourceEventArgs.cs
- TCEAdapterGenerator.cs
- TemplatePagerField.cs
- PatternMatcher.cs
- AppDomainEvidenceFactory.cs
- XmlTextEncoder.cs
- JoinCqlBlock.cs
- SvcMapFileLoader.cs
- QueuePathDialog.cs
- FunctionGenerator.cs
- GregorianCalendar.cs
- ResourceProviderFactory.cs
- DataPagerField.cs
- SqlReferenceCollection.cs
- TdsParserSessionPool.cs
- Token.cs
- CodeSnippetExpression.cs
- XmlSerializationGeneratedCode.cs
- WriteableBitmap.cs
- DbDataReader.cs
- SessionEndingCancelEventArgs.cs
- QueryCursorEventArgs.cs
- ValidationErrorInfo.cs
- TaskSchedulerException.cs
- LocalFileSettingsProvider.cs
- EntityStoreSchemaFilterEntry.cs
- AnnotationResourceCollection.cs
- ClipboardData.cs
- ObjectNavigationPropertyMapping.cs
- ResolveRequestResponseAsyncResult.cs
- ExtensibleClassFactory.cs
- xmlglyphRunInfo.cs
- XmlTextAttribute.cs
- XmlConverter.cs
- DeploymentSectionCache.cs
- TextClipboardData.cs
- XPathExpr.cs
- SafeFileMappingHandle.cs
- PageThemeCodeDomTreeGenerator.cs
- CustomUserNameSecurityTokenAuthenticator.cs
- Oid.cs
- XmlQueryRuntime.cs
- SmtpDateTime.cs
- CellIdBoolean.cs
- InvokeBase.cs
- ConfigurationElementCollection.cs
- DoWorkEventArgs.cs
- DirectoryObjectSecurity.cs
- TextDecorationCollection.cs
- IPCCacheManager.cs
- BStrWrapper.cs
- XmlTextAttribute.cs
- RealProxy.cs
- ConstantSlot.cs
- ProviderSettings.cs
- ResourcePermissionBaseEntry.cs
- FamilyMap.cs
- LabelTarget.cs
- DetailsViewInsertedEventArgs.cs
- TemplateEditingFrame.cs
- CounterSampleCalculator.cs
- EndpointDispatcher.cs
- ClientBuildManagerCallback.cs
- StylusButtonCollection.cs
- Message.cs
- MissingSatelliteAssemblyException.cs
- HeaderUtility.cs
- Wildcard.cs
- ResourceReferenceKeyNotFoundException.cs
- AttachedPropertyBrowsableForChildrenAttribute.cs
- Page.cs
- TemplateManager.cs
- ErrorWebPart.cs
- SessionParameter.cs
- GroupItem.cs
- TreeViewDesigner.cs
- SignatureToken.cs
- ThreadPool.cs
- MetadataElement.cs
- CircleEase.cs
- MsmqMessage.cs
- DesignerVerbToolStripMenuItem.cs
- UnitySerializationHolder.cs
- QilTernary.cs
- Menu.cs
- controlskin.cs
- DataStreamFromComStream.cs
- EndOfStreamException.cs
- HttpCacheVary.cs
- XmlEventCache.cs
- ProcessHost.cs
- LocalizationCodeDomSerializer.cs
- TokenBasedSet.cs