Class: ViewportChange

Defined in: packages/blockly/core/events/events_viewport.ts:26

Notifies listeners that the workspace surface's position or scale has changed.

Does not notify when the workspace itself resizes.

Extends

• UiBase

Properties index

Property	Description
group	An ID for the group of events this block is associated with.
isBlank	Whether or not the event was constructed without necessary parameters (to be populated by fromJson).
workspaceId	The workspace identifier for this event.
recordUndo	Whether this event is undoable or not.
isUiEvent	Whether or not the event is a UI event.
viewTop	Top edge of the visible portion of the workspace, relative to the workspace origin.
viewLeft	The left edge of the visible portion of the workspace, relative to the workspace origin.
scale	The scale of the workpace.
oldScale	The previous scale of the workspace.
type	Type of this event.

Methods index

Method	Description
isNull	Does this event record any change of state?
run	Run an event.
getEventWorkspace_	Get workspace the event belongs to.
toJson	Encode the event as JSON.

Constructors

Constructor

new ViewportChange(
   opt_top?, 
   opt_left?, 
   opt_scale?, 
   opt_workspaceId?, 
   opt_oldScale?
): ViewportChange;

Defined in: packages/blockly/core/events/events_viewport.ts:58

Parameters

Parameter	Type	Description
opt_top?	number	Top-edge of the visible portion of the workspace, relative to the workspace origin. Undefined for a blank event.
opt_left?	number	Left-edge of the visible portion of the workspace relative to the workspace origin. Undefined for a blank event.
opt_scale?	number	The scale of the workspace. Undefined for a blank event.
opt_workspaceId?	string	The workspace identifier for this event. Undefined for a blank event.
opt_oldScale?	number	The old scale of the workspace. Undefined for a blank event.

Returns

ViewportChange

Overrides

UiBase.constructor

Properties

group

group: string;

Defined in: packages/blockly/core/events/events_abstract.ts:38

An ID for the group of events this block is associated with.

Groups define events that should be treated as an single action from the user's perspective, and should be undone together.

Inherited from

UiBase.group

---

isBlank

isBlank: boolean = true;

Defined in: packages/blockly/core/events/events_ui_base.ts:25

Whether or not the event was constructed without necessary parameters (to be populated by fromJson).

Inherited from

UiBase.isBlank

---

workspaceId

workspaceId: string;

Defined in: packages/blockly/core/events/events_ui_base.ts:26

The workspace identifier for this event.

Inherited from

UiBase.workspaceId

---

recordUndo

recordUndo: boolean = false;

Defined in: packages/blockly/core/events/events_ui_base.ts:29

Whether this event is undoable or not.

Inherited from

UiBase.recordUndo

---

isUiEvent

isUiEvent: boolean = true;

Defined in: packages/blockly/core/events/events_ui_base.ts:32

Whether or not the event is a UI event.

Inherited from

UiBase.isUiEvent

---

viewTop?

optional viewTop?: number;

Defined in: packages/blockly/core/events/events_viewport.ts:31

Top edge of the visible portion of the workspace, relative to the workspace origin.

---

viewLeft?

optional viewLeft?: number;

Defined in: packages/blockly/core/events/events_viewport.ts:37

The left edge of the visible portion of the workspace, relative to the workspace origin.

---

scale?

optional scale?: number;

Defined in: packages/blockly/core/events/events_viewport.ts:40

The scale of the workpace.

---

oldScale?

optional oldScale?: number;

Defined in: packages/blockly/core/events/events_viewport.ts:43

The previous scale of the workspace.

---

type

type: EventType = EventType.VIEWPORT_CHANGE;

Defined in: packages/blockly/core/events/events_viewport.ts:45

Type of this event.

Overrides

UiBase.type

Methods

isNull()

isNull(): boolean;

Defined in: packages/blockly/core/events/events_abstract.ts:91

Does this event record any change of state?

Returns

boolean

True if null, false if something changed.

Inherited from

UiBase.isNull

---

run()

run(_forward): void;

Defined in: packages/blockly/core/events/events_abstract.ts:100

Run an event.

Parameters

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

Returns

void

Inherited from

UiBase.run

---

getEventWorkspace_()

getEventWorkspace_(): Workspace;

Defined in: packages/blockly/core/events/events_abstract.ts:111

Get workspace the event belongs to.

Returns

Workspace

The workspace the event belongs to.

Throws

if workspace is null.

Inherited from

UiBase.getEventWorkspace_

---

toJson()

toJson(): ViewportChangeJson;

Defined in: packages/blockly/core/events/events_viewport.ts:78

Encode the event as JSON.

Returns

ViewportChangeJson

JSON representation.

Overrides

UiBase.toJson