---
title: "rulerView(_:shouldMove:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nstextview/rulerview(_:shouldmove:)"
---

# rulerView(_:shouldMove:)

Returns whether the marker should be moved.

## Declaration

```swift
func rulerView(_ ruler: NSRulerView, shouldMove marker: NSRulerMarker) -> Bool
```

## Parameters

- `ruler`: The ruler view sending the message.
- `marker`: The marker to be moved.

## Return Value

Return Value true if aMarker can be moved, false otherwise.

## Discussion

Discussion This method controls whether an existing marker aMarker can be moved. The receiver checks for permission to make the change by invoking shouldChangeText(in:replacementString:) and returning the return value of that message. If the change is allowed, the receiver is then sent a rulerView(_:didMove:) message.

## See Also

### Supporting the ruler view

- [rulerView(_:didMove:)](appkit/nstextview/rulerview(_:didmove:).md)
- [rulerView(_:willMove:toLocation:)](appkit/nstextview/rulerview(_:willmove:tolocation:).md)
- [rulerView(_:didRemove:)](appkit/nstextview/rulerview(_:didremove:).md)
- [rulerView(_:shouldRemove:)](appkit/nstextview/rulerview(_:shouldremove:).md)
- [rulerView(_:didAdd:)](appkit/nstextview/rulerview(_:didadd:).md)
- [rulerView(_:shouldAdd:)](appkit/nstextview/rulerview(_:shouldadd:).md)
- [rulerView(_:willAdd:atLocation:)](appkit/nstextview/rulerview(_:willadd:atlocation:).md)
- [rulerView(_:handleMouseDownWith:)](appkit/nstextview/rulerview(_:handlemousedownwith:).md)