Example of using the Command Pattern in C#. More...

Collaboration diagram for Command_Exercise:

Public Member Functions
void	Run ()
	Executes the example for the Command Pattern in C#.

Private Member Functions
void	Command_Save_And_Execute (Command_TextObject text, Command command)
	Save the given command on the undo list then execute the command on the given text object.

void	Command_Operation_Replace (Command_TextObject source, string searchPattern, string replaceText)
	An operation to search and replace text in a Command_TextObject.

void	Command_Operation_Reverse (Command_TextObject source)
	An operation to reverse the characters in the given Command_TextObject.

void	Command_Undo (Command_TextObject text)
	Perform an undo on the given Command_TextObject, using the commands in the "global" undo list. If the undo list is empty, nothing happens.

void	Command_ApplyReplaceCommand (Command_TextObject text, string searchPattern, string replaceText)
	Helper function to create a Command object that replaces text in the given Command_TextObject, adds the command to the undo list and then applies the command to the Command_TextObject. Finally, it shows off what was done.

void	Command_ApplyReverseCommand (Command_TextObject text)
	Helper function to create a Command object that reverses the order of the characters in the given Command_TextObject, adds the command to the undo list and then applies the command to the Command_TextObject. Finally, it shows what was done.

Private Attributes
Stack< Command >	_commandUndoList = new Stack<Command>()
	The list of commands applied.

Detailed Description

Example of using the Command Pattern in C#.

The Command pattern is used to encapsulate an operation or command associated with an object so that the command can be applied to the object at a later time.

In this exercise, an undo list is implemented using Commands that associate commands defined in this file with a text object. The commands are applied to the text object in succession then effectively undone.

Definition at line 24 of file Command_Exercise.cs.

Member Function Documentation

◆ Command_ApplyReplaceCommand()

void Command_ApplyReplaceCommand	(	Command_TextObject	text,
		string	searchPattern,
		string	replaceText
	)

inlineprivate

Helper function to create a Command object that replaces text in the given Command_TextObject, adds the command to the undo list and then applies the command to the Command_TextObject. Finally, it shows off what was done.

Parameters

text	The Command_TextObject to affect.
searchPattern	What to look for in the Command_TextObject.
replaceText	What to replace the searchPattern with.

Definition at line 104 of file Command_Exercise.cs.

References Command_Exercise.Command_Operation_Replace(), and Command_Exercise.Command_Save_And_Execute().

Referenced by Command_Exercise.Run().

◆ Command_ApplyReverseCommand()

void Command_ApplyReverseCommand ( Command_TextObject text )

inlineprivate

Helper function to create a Command object that reverses the order of the characters in the given Command_TextObject, adds the command to the undo list and then applies the command to the Command_TextObject. Finally, it shows what was done.

Parameters