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  "identifier" : "/documentation/AppKit/NSMatrix/mouseDownFlags",
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  "role" : "Instance Property",
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# mouseDownFlags

The flags in effect at the mouse-down event that started the current tracking session.

```
var mouseDownFlags: Int { get }
```

## Discussion

The [`NSMatrix`](/documentation/AppKit/NSMatrix) [`mouseDown(with:)`](/documentation/AppKit/NSMatrix/mouseDown(with:)) method obtains these flags by sending a [`modifierFlags`](/documentation/AppKit/NSEvent/modifierFlags-swift.property) message to the event passed into [`mouseDown(with:)`](/documentation/AppKit/NSMatrix/mouseDown(with:)). Use this property if you want to access these flags. This property is valid only during tracking; it isn’t useful if the target of the receiver initiates another tracking loop as part of its action method (as a cell that pops up a pop-up list does, for example).

## See Also

[`sendAction(on:)`](/documentation/AppKit/NSControl/sendAction(on:))

Sets the conditions on which the receiver sends action messages to its target.


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