Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / Command.cs / 1 / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- LoginViewDesigner.cs
- ImageField.cs
- AssociationSet.cs
- PublisherMembershipCondition.cs
- ViewGenerator.cs
- XmlIncludeAttribute.cs
- ServiceHostFactory.cs
- SlipBehavior.cs
- SpeechSynthesizer.cs
- SystemIcons.cs
- EntityClassGenerator.cs
- HttpSysSettings.cs
- DbParameterHelper.cs
- HelpProvider.cs
- MetadataItemCollectionFactory.cs
- CharacterBufferReference.cs
- TableLayoutStyle.cs
- TransformerInfoCollection.cs
- GregorianCalendar.cs
- ReadOnlyNameValueCollection.cs
- ConfigXmlWhitespace.cs
- AppDomainManager.cs
- EdmItemError.cs
- StackBuilderSink.cs
- TransportManager.cs
- NavigationFailedEventArgs.cs
- MediaContextNotificationWindow.cs
- StylusPointProperty.cs
- SudsWriter.cs
- CultureTableRecord.cs
- JsonFormatReaderGenerator.cs
- SafeWaitHandle.cs
- TextRenderingModeValidation.cs
- _CacheStreams.cs
- UserControl.cs
- CellPartitioner.cs
- ComplexTypeEmitter.cs
- QilInvokeLateBound.cs
- BooleanProjectedSlot.cs
- NTAccount.cs
- EllipseGeometry.cs
- DataErrorValidationRule.cs
- EUCJPEncoding.cs
- RuntimeConfigurationRecord.cs
- DefaultObjectSerializer.cs
- DataTableCollection.cs
- TdsParserSessionPool.cs
- ProviderManager.cs
- PasswordValidationException.cs
- LocalizedNameDescriptionPair.cs
- IdnElement.cs
- ManipulationBoundaryFeedbackEventArgs.cs
- RegexFCD.cs
- BindStream.cs
- XamlVector3DCollectionSerializer.cs
- ByteStream.cs
- TabItemAutomationPeer.cs
- BaseDataBoundControl.cs
- RoutedEventConverter.cs
- GridItemProviderWrapper.cs
- BrushMappingModeValidation.cs
- RecipientInfo.cs
- RepeaterCommandEventArgs.cs
- TimeIntervalCollection.cs
- GradientStopCollection.cs
- PrintingPermission.cs
- ExceptionHelpers.cs
- Table.cs
- SynchronizationFilter.cs
- DocumentScope.cs
- _TLSstream.cs
- XmlLangPropertyAttribute.cs
- BezierSegment.cs
- TextBoxAutomationPeer.cs
- ConcatQueryOperator.cs
- InstalledFontCollection.cs
- GetPageNumberCompletedEventArgs.cs
- FileDialog.cs
- SHA1Managed.cs
- MdiWindowListItemConverter.cs
- SimpleHandlerBuildProvider.cs
- MaskedTextProvider.cs
- RuntimeIdentifierPropertyAttribute.cs
- DesignerProperties.cs
- BamlRecordReader.cs
- ACE.cs
- CryptoApi.cs
- HwndKeyboardInputProvider.cs
- PngBitmapDecoder.cs
- XmlReader.cs
- DataGridDesigner.cs
- SHA256Managed.cs
- SymbolEqualComparer.cs
- XmlSequenceWriter.cs
- CodeIterationStatement.cs
- MailBnfHelper.cs
- SQLSingleStorage.cs
- DesignerLinkAdapter.cs
- ResXResourceWriter.cs
- SqlXml.cs