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blockly > comments > CommentView > addOnCollapseListener
Registers a callback that listens for collapsed-ness changes.
Signature:
addOnCollapseListener(listener: (newCollapse: boolean) => void): void;
Parameters
| Parameter |
Type |
Description |
| listener |
(newCollapse: boolean) => void |
|
Returns:
void
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Last updated 2024-09-18 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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-09-18 UTC."],[[["The `addOnCollapseListener` method allows you to register a callback function."],["This callback function is triggered whenever the collapsed state of a comment view changes."],["The listener function receives a boolean argument indicating the new collapsed state of the comment view (`true` for collapsed, `false` for expanded)."],["This method facilitates reacting to comment visibility changes within Blockly projects."]]],["The `addOnCollapseListener` method, part of the `comments.CommentView` class, registers a callback function. This function, provided as a `listener` parameter, is invoked whenever the collapsed state of a comment changes. The `listener` function receives a boolean `newCollapse` parameter, indicating the new collapsed state. The method does not return any value.\n"]]
