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blockly > Events > ViewportChange
Events.ViewportChange class
Notifies listeners that the workspace surface's position or scale has changed.
Does not notify when the workspace itself resizes.
Signature:
export declare class ViewportChange extends UiBase
Extends: UiBase
Constructors
Properties
| Property |
Modifiers |
Type |
Description |
| oldScale? |
|
number |
(Optional) The previous scale of the workspace. |
| scale? |
|
number |
(Optional) The scale of the workpace. |
| type |
|
EventType |
|
| viewLeft? |
|
number |
(Optional) The left edge of the visible portion of the workspace, relative to the workspace origin. |
| viewTop? |
|
number |
(Optional) Top edge of the visible portion of the workspace, relative to the workspace origin. |
Methods
| Method |
Modifiers |
Description |
| toJson() |
|
Encode the event as JSON. |
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Last updated 2025-05-16 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-16 UTC."],[[["The `ViewportChange` event is triggered when the workspace view changes, such as panning or zooming."],["This event provides information about the new and previous scale and position of the workspace view."],["It does not trigger when the workspace itself resizes, only when the visible area changes."],["Developers can use this event to react to workspace view changes and update UI elements accordingly."]]],["The `ViewportChange` class notifies listeners about changes to the workspace surface's position or scale, excluding workspace resizing. It extends the `UiBase` class. Key properties include `oldScale`, `scale`, `viewLeft`, and `viewTop`, representing the previous and current scale, and the visible portion's edges, respectively. The class's constructor creates new instances, and the `toJson()` method encodes the event into JSON format. Its purpose is to inform of changes in what the user see.\n"]]
