Programming F# 3.0 by Chris Smith

Author:Chris Smith [Chris Smith]
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Programming Languages / General
ISBN: 9781449335519
Publisher: O'Reilly Media
Published: 2012-04-04T16:00:00+00:00

However, Observable.filter and Observable.partition are not the only useful methods in the module.

Observable.add

Observable.add simply subscribes to the event. Typically this method is used at the end of a series of pipe-forward operations and is a cleaner way to subscribe to events than calling AddHandler on the event object.

Observable.add has the following signature:

val add : ('a -> unit) -> IObservable<'a> -> unit

Example 8-16 pops up a message box whenever the mouse moves into the bottom half of a form.

Example 8-16. Subscribing to events with Observable.add

open System.Windows.Forms let form = new Form(Text="Keep out of the bottom!", TopMost=true) form.MouseMove |> Observable.filter (fun moveArgs -> moveArgs.Y > form.Height / 2) |> Observable.add (fun moveArgs -> MessageBox.Show("Moved into bottom half!") |> ignore) form.ShowDialog()

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