Class TUndoItem

Fields

Unit

type TUndoItem = class(TObject)

TUndoItem is an abstract interface for a command. Descendants define what the command does and how to undo and redo the command.

This is an ancestral type; different forms can inherit this and modify it to meet needs of data on that form.

	`function GetUndoDescription: string; virtual;`
	`function GetShortUndoDescription: string; virtual;`
	`function GetRedoDescription: string; virtual;`
	`function GetShortRedoDescription: string; virtual;`
	`function GetUndoMenuText: string; virtual;`
	`function GetRedoMenuText: string; virtual;`
	`procedure DoCommand; virtual; abstract;`
	`procedure Undo; virtual; abstract;`
	`procedure Redo; virtual; abstract;`

	`property UndoDescription: string read GetUndoDescription;`
	`property ShortUndoDescription: string read GetShortUndoDescription;`
	`property RedoDescription: string read GetRedoDescription;`
	`property ShortRedoDescription: string read GetShortRedoDescription;`
	`property UndoMenuText: string read GetUndoMenuText;`
	`property RedoMenuText: string read GetRedoMenuText;`

	`function GetUndoDescription: string; virtual;`
`GetUndoDescription` is a description of what is to be undone.

	`function GetShortUndoDescription: string; virtual;`
`GetShortUndoDescription` is a short description of what is to be undone.

	`function GetRedoDescription: string; virtual;`
`GetRedoDescription` is a description of what is to be redone.

	`function GetShortRedoDescription: string; virtual;`
`GetShortRedoDescription` is a short description of what is to be redone.

	`function GetUndoMenuText: string; virtual;`
`GetUndoMenuText` is text to display for a menu item that undoes the action.

	`function GetRedoMenuText: string; virtual;`
`GetRedoMenuText` is text to display for a menu item that redoes the action.

	`procedure DoCommand; virtual; abstract;`
`DoCommand` does the command for the first time.

	`procedure Undo; virtual; abstract;`
`Undo` undoes the command.

	`procedure Redo; virtual; abstract;`
`Redo` redoes the command after being undone.

	`property UndoDescription: string read GetUndoDescription;`
`UndoDescription` is a description of what is to be undone.

	`property ShortUndoDescription: string read GetShortUndoDescription;`
`ShortUndoDescription` is a short description of what is to be undone.

	`property RedoDescription: string read GetRedoDescription;`
`RedoDescription` is a description of what is to be redone.

	`property ShortRedoDescription: string read GetShortRedoDescription;`
`ShortRedoDescription` is a short description of what is to be redone.

	`property UndoMenuText: string read GetUndoMenuText;`
`UndoMenuText` is text to display for a menu item that undoes the action.

	`property RedoMenuText: string read GetRedoMenuText;`
`RedoMenuText` is text to display for a menu item that redoes the action.

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