# acceptsFirstMouse(for:) Returns a Boolean value that indicates whether the view accepts the initial mouse-down event. ``` func acceptsFirstMouse(for event: NSEvent?) -> Bool ``` ## Parameters `event` The initial mouse-down event, which must be over the view in its window. ## Discussion Subclasses can override this method to return if the view should be sent a [`mouseDown(with:)`](/documentation/AppKit/NSResponder/mouseDown(with:)) message for an initial mouse-down event, if not. The view can either return a value unconditionally or use the location of `event` to determine whether or not it wants the event. The default implementation ignores `event` and returns . Override this method in a subclass to allow instances to respond to click-through. This allows the user to click on a view in an inactive window, activating the view with one click, instead of clicking first to make the window active and then clicking the view. Most view objects refuse a click-through attempt, so the event simply activates the window. Many control objects, however, such as instances of [`NSButton`](/documentation/AppKit/NSButton) and [`NSSlider`](/documentation/AppKit/NSSlider), do accept them, so the user can immediately manipulate the control without having to release the mouse button. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)