Code:
/ DotNET / DotNET / 8.0 / 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.
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