ChangeHistoryService

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Plugin developers must use ChangeHistoryService to tell Studio how to undo and redo changes that their plugins make to experiences by recording. Before making changes, a plugin calls ChangeHistoryService:TryBeginRecording(), remembering the identifier it assigns, then after making changes, the Plugin calls ChangeHistoryService:FinishRecording() to complete the recording.

Plugins may also programmatically invoke an undo or redo through ChangeHistoryService:Undo() or ChangeHistoryService:Redo().

ChangeHistoryService is not enabled at runtime, so calling its methods in a running experience has no effect.

Resumo

Métodos

  • FinishRecording(identifier : string,operation : Enum.FinishRecordingOperation,finalOptions : Dictionary?):void
    segurança do plugin

    Communicates to Studio that the identified recording is finished and to take the final operation to complete the recording.

  • GetCanRedo():Tuple
    segurança do plugin

    Returns whether there are actions that can be redone, and, if there are, returns the last of them.

  • GetCanUndo():Tuple
    segurança do plugin

    Returns whether there are actions that can be undone, and, if there are, returns the last of them.

  • IsRecordingInProgress(identifier : string?):bool
    segurança do plugin
  • Redo():void
    segurança do plugin

    Executes the last action that was undone.

  • ResetWaypoints():void
    segurança do plugin

    Clears the history, causing all undo/redo waypoints to be removed.

  • SetEnabled(state : bool):void
    segurança do plugin

    Sets whether or not the ChangeHistoryService is enabled.

  • SetWaypoint(name : string):void
    segurança do plugin

    Sets a new waypoint which can be used as an undo or redo point.

  • TryBeginRecording(name : string,displayName : string?):string?
    segurança do plugin

    Begins tracking changes made to the data model into a recording.

  • Undo():void
    segurança do plugin

    Undos the last action taken, for which there exists a waypoint.

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Eventos

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Propriedades

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Métodos

FinishRecording

void
segurança do plugin

Parâmetros

identifier: string

Identifies the recording from the previous call to TryBeginRecording(). If the operation is Enum.ChangeHistoryService.FinishRecordingOperation.Cancel, this value is ignored, and the recording is determined by context.

operation: Enum.FinishRecordingOperation

Specifies the operation to take.

finalOptions: Dictionary

Optional table of values to pass to OnFinishRecording.


Devolução

void

Amostras de código

ChangeHistoryService:TryBeginRecording
local ChangeHistoryService = game:GetService("ChangeHistoryService")

local Selection = game:GetService("Selection")



local toolbar = plugin:CreateToolbar("Example Plugin")

local button = toolbar:CreateButton("Neon it up", "", "")



button.Click:Connect(function()

	local parts = {}

	for _, part in pairs(Selection:Get()) do

		if part:IsA("BasePart") then

			parts[#parts + 1] = part

		end

	end



	if #parts < 1 then

    -- Nothing to do.

    return

  end



  local recording = ChangeHistoryService:TryBeginRecording("Set selection to neon")

  if not recording then

    -- Handle error here. This indidcates that your plugin began a previous

    -- recording and never completed it. You may only have one recording

    -- per plugin active at a time.

    return

  end

  

  for _, part in pairs(parts) do

    part.Material = Enum.Material.Neon

  end



  ChangeHistoryService:FinishRecording(recording, Enum.FinishRecordingOperation.Commit)

end)

GetCanRedo

Tuple
segurança do plugin

Returns whether there are actions that can be redone, and, if there are, returns the last of them.


Devolução

Tuple

GetCanUndo

Tuple
segurança do plugin

Returns whether there are actions that can be undone, and, if there are, returns the last of them.


Devolução

Tuple

IsRecordingInProgress

bool
segurança do plugin

Parâmetros

identifier: string

Devolução

bool

Redo

void
segurança do plugin

Executes the last action that was undone.


Devolução

void

ResetWaypoints

void
segurança do plugin

Clears the history, causing all undo/redo waypoints to be removed.


Devolução

void

SetEnabled

void
segurança do plugin

Sets whether or not the ChangeHistoryService is enabled. When set to false, the undo/redo list is cleared, and does not repopulate. When set to true again, the original list is not restored, but further operations append to the list once more

Parâmetros

state: bool

Devolução

void

SetWaypoint

void
segurança do plugin

This method will be deprecated soon in favor of TryBeginRecording().

ChangeHistoryService tracks plugin history as a stream of property changes. SetWaypoint() creates a cut in that stream of property changes so that the undo and redo actions know where to stop.

By convention, user-invoked actions in Studio must call SetWaypoint() after completing their set of changes to the experience. Calling it before a set of changes may clean up another misbehaving plugin which failed to set a waypoint, but it's a poor reason to justify such usage in your own plugin.

Parâmetros

name: string

Devolução

void

Amostras de código

ChangeHistoryService:SetWaypoint
local ChangeHistoryService = game:GetService("ChangeHistoryService")

local Selection = game:GetService("Selection")



local toolbar = plugin:CreateToolbar("Example Plugin")

local button = toolbar:CreateButton("Neon it up", "", "")



button.Click:Connect(function()

	local parts = {}

	for _, part in pairs(Selection:Get()) do

		if part:IsA("BasePart") then

			parts[#parts + 1] = part

		end

	end



	if #parts > 0 then

		-- Calling SetWaypoint before the work will not cause any issues, however 

		-- it is redundant, only the call AFTER the work is needed.

		--ChangeHistoryService:SetWaypoint("Setting selection to neon")

		

		for _, part in pairs(parts) do

			part.Material = Enum.Material.Neon

		end



		-- Call SetWaypoint AFTER completing the work

		ChangeHistoryService:SetWaypoint("Set selection to neon")

	else

		-- Nothing to do. You do not need to call SetWaypoint in the case where

		-- the action did not end up making any changes to the experience.

	end

end)

TryBeginRecording

string
segurança do plugin

This method begins a recording to track changes to the data model. You must call it prior to making changes to avoid future warnings or errors.

When the recording is completed, you call FinishRecording() with the returned recording identifier to complete the recording and update the undo/redo stack.

This method will return nil if it fails to begin a recording. Recordings fail if the plugin already has a recording in progress, or if the user is in Run or Play mode.

You may use IsRecordingInProgress() to check the recording status of the plugin.

Parâmetros

name: string

Name of the action being performed suitable for logging and coding purposes.

displayName: string

Name of the action being performed to display to the user.


Devolução

string

Amostras de código

ChangeHistoryService:TryBeginRecording
local ChangeHistoryService = game:GetService("ChangeHistoryService")

local Selection = game:GetService("Selection")



local toolbar = plugin:CreateToolbar("Example Plugin")

local button = toolbar:CreateButton("Neon it up", "", "")



button.Click:Connect(function()

	local parts = {}

	for _, part in pairs(Selection:Get()) do

		if part:IsA("BasePart") then

			parts[#parts + 1] = part

		end

	end



	if #parts < 1 then

    -- Nothing to do.

    return

  end



  local recording = ChangeHistoryService:TryBeginRecording("Set selection to neon")

  if not recording then

    -- Handle error here. This indidcates that your plugin began a previous

    -- recording and never completed it. You may only have one recording

    -- per plugin active at a time.

    return

  end

  

  for _, part in pairs(parts) do

    part.Material = Enum.Material.Neon

  end



  ChangeHistoryService:FinishRecording(recording, Enum.FinishRecordingOperation.Commit)

end)

Undo

void
segurança do plugin

Undos the last action taken, for which there exists a waypoint.


Devolução

void
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Eventos

OnRecordingFinished

segurança do plugin

Parâmetros

name: string

Name of the action being performed suitable for logging and coding purposes.

displayName: string

Name of the action being performed to display to the user.

identifier: string

The identifier for the recording.

operationn: Enum.FinishRecordingOperation
finalOptions: Dictionary

Optional table from FinishOperation().


OnRecordingStarted

segurança do plugin

Parâmetros

name: string

Name of the action being performed suitable for logging and coding purposes.

displayName: string

Name of the action being performed to display to the user.


OnRedo

segurança do plugin

Fired when the user reverses the undo command. Waypoint describes the type action that has been redone.

Parâmetros

waypoint: string

OnUndo

segurança do plugin

Fired when the user undoes an action in studio. Waypoint describes the type action that has been undone.

Parâmetros

waypoint: string

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