Class: Change

Constructor

Change

new Change(block, element, name, oldValue, newValue)

Class for a block change event.

Parameter
block	Blockly.Block The changed block. Null for a blank event.
element	string One of 'field', 'comment', 'disabled', etc.
name	string Name of input or field affected, or null. Value may be null.
oldValue	any type Previous value of element.
newValue	any type New value of element.

Extends: Blockly.Events.BlockBase

Properties

blockId

unknown

The block id for the block this event pertains to

Inherited from: Blockly.Events.BlockBase#blockId

group

unknown

The event group id for the group this event belongs to. Groups define events that should be treated as an single action from the user's perspective, and should be undone together.

Inherited from: Blockly.Events.Abstract#group

recordUndo

unknown

Sets whether the event should be added to the undo stack.

Inherited from: Blockly.Events.Abstract#recordUndo

type

string

Type of this event.

workspaceId

unknown

The workspace identifier for this event.

Inherited from: Blockly.Events.Abstract#workspaceId

Methods

fromJson

fromJson(json)

Decode the JSON event.

Parameter
json	Object JSON representation. Value must not be null.

getEventWorkspace_

protected

getEventWorkspace_() returns Blockly.Workspace

Get workspace the event belongs to.

Inherited from: Blockly.Events.Abstract#getEventWorkspace_
Throws: if workspace is null.
Returns: The workspace the event belongs to.

isNull

isNull() returns boolean

Does this event record any change of state?

Returns: boolean False if something changed.

run

run(forward)

Run a change event.

Parameter
forward	boolean True if run forward, false if run backward (undo).

Parameter

forward

boolean

True if run forward, false if run backward (undo).

toJson

toJson() returns Object

Encode the event as JSON.

Returns: non-null Object JSON representation.