CommandQueue Class |
Class which is used as a command queue to store commands to execute. Supports undo/redo.
Inheritance HierarchyNamespace: SD.Tools.Algorithmia.Commands
Assembly: SD.Tools.Algorithmia (in SD.Tools.Algorithmia.dll) Version: 1.3.3.0 (1.3.18.0209)
SyntaxThe CommandQueue type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | CommandQueue |
Initializes a new instance of the CommandQueue class.
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Properties| Name | Description | |
|---|---|---|
 | ActiveCommand |
Gets the active command in this queue.
|
| CanDo |
Gets a value indicating whether this command queue can do a current command (so there's a command left to execute) (true) or false if no more commands
can be executed in this queue.
|
| CanUndo |
Gets a value indicating whether this command queue can undo the last executed command (so there are commands left to undo) (true), or false if no more
commands can be undone in this queue.
|
| Count |
Gets the number of commands in this queue
|
Methods| Name | Description | |
|---|---|---|
| Clear |
Clears this instance.
|
| DequeueLastExecutedCommand |
Dequeues the last executed command. This is done in periods which aren't undoable.
|
| DoCurrentCommand |
Calls the current command's Do() method, if there's a command left to execute. It first makes the next command the current command and then executes it.
|
| EnqueueCommand |
Enqueues the command specified and makes it the current command.
|
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetEnumerator |
Returns an enumerator that iterates through the collection.
|
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| RedoCurrentCommand |
Calls the current command's Redo() method, if there's a command left to execute. It first makes the next command the current command and then executes it.
|
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
| UndoPreviousCommand |
Calls the last executed command's Undo method, if there's was a command last executed. It then makes the previous command the current command.
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Extension Methods| Name | Description | |
|---|---|---|
 | SetEqualCommandBase(IEnumerableCommandBase) | Overloaded.
Checks whether the enumerable to compare with is equal to the source enumerable, element wise. If elements are in a different order, the
method will still return true. This is different from SequenceEqual which does take order into account
(Defined by IEnumerableExtensionMethods.) |
| SetEqualCommandBase(IEnumerableCommandBase, IEqualityComparerCommandBase) | Overloaded.
Checks whether the enumerable to compare with is equal to the source enumerable, element wise. If elements are in a different order, the
method will still return true. This is different from SequenceEqual which does take order into account
(Defined by IEnumerableExtensionMethods.) |
| ToFilteringBindingListCommandBase |
Converts the passed in enumerable to a FilteringBindingList
(Defined by ExtensionMethods.) |
| ToHashSetCommandBase |
Creates a new hashset and adds the source to it.
(Defined by IEnumerableExtensionMethods.) |
| ToListSafeCommandBase |
Converts the passed in enumerable to a List(Of T). If toEnumerate is a CommandifiedList(Of T) it will lock on its SyncRoot if it's a synchronized CommandifiedList.
if it's not a commandified list, it will simply call ToList() on the enumerable. If toEnumerate is null, null is returned.
(Defined by ExtensionMethods.) |
| ToReadOnlyCollectionTDestination |
Converts the enumerable to a ReadOnlyCollection.
(Defined by IEnumerableExtensionMethods.) |
Explicit Interface Implementations| Name | Description | |
|---|---|---|
  | IEnumerableGetEnumerator |
Returns an enumerator that iterates through a collection.
|
RemarksThis command queue uses the policy that the current command pointer points to the command which has been executed the last time. It can only be
null if it hasn't executed any commands or if the queue is empty.
This policy is different from the policy where the current command pointer points to the command which is about to be executed: as the execution of a command
can spawn commands, it first has to move to the command executed, and then execute it, otherwise there is a state where the current command pointer is actually
the command which was executed last (as the new command to enqueue is spawned during execution of the command), because the move to the new command happens after
the command has been executed in full.
See Also