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Form changing color

Windows Forms tutorial showing how to create form with button and how to register an event handler. When the button is clicked, the form changes its background color.

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open System
open System.Drawing
open System.Windows.Forms

// Create form, button and add button to form
let form = new Form(Text = "Hello world!")
let btn = new Button(Text = "Click here")
form.Controls.Add(btn)

// Register event handler for button click event
btn.Click.Add(fun _ ->
  // Generate random color and set it as background
  let rnd = new Random()
  let r, g, b = rnd.Next(256), rnd.Next(256), rnd.Next(256)
  form.BackColor <- Color.FromArgb(r, g, b) )

// Show the form (in F# Interactive)
form.Show()
// Run the application (in compiled application)
Application.Run(form)

namespace System

namespace System.Drawing

namespace System.Windows

namespace System.Windows.Forms

val form : Form

Full name: Script.form

Multiple items
type Form =
  inherit ContainerControl
  new : unit -> Form
  member AcceptButton : IButtonControl with get, set
  member Activate : unit -> unit
  member ActiveMdiChild : Form
  member AddOwnedForm : ownedForm:Form -> unit
  member AllowTransparency : bool with get, set
  member AutoScale : bool with get, set
  member AutoScaleBaseSize : Size with get, set
  member AutoScroll : bool with get, set
  member AutoSize : bool with get, set
  ...
  nested type ControlCollection

Full name: System.Windows.Forms.Form

--------------------
Form() : unit

Multiple items
namespace System.Drawing.Text

--------------------
namespace System.Text

val btn : Button

Full name: Script.btn

Multiple items
type Button =
  inherit ButtonBase
  new : unit -> Button
  member AutoSizeMode : AutoSizeMode with get, set
  member DialogResult : DialogResult with get, set
  member NotifyDefault : value:bool -> unit
  member PerformClick : unit -> unit
  member ToString : unit -> string
  event DoubleClick : EventHandler
  event MouseDoubleClick : MouseEventHandler

Full name: System.Windows.Forms.Button

--------------------
Button() : unit

property Control.Controls: Control.ControlCollection

Control.ControlCollection.Add(value: Control) : unit

event Control.Click: IEvent<EventHandler,EventArgs>

member IObservable.Add : callback:('T -> unit) -> unit

val rnd : Random

Multiple items
type Random =
  new : unit -> Random + 1 overload
  member Next : unit -> int + 2 overloads
  member NextBytes : buffer:byte[] -> unit
  member NextDouble : unit -> float

Full name: System.Random

--------------------
Random() : unit
Random(Seed: int) : unit

val r : int

val g : int

val b : int

Random.Next() : int
Random.Next(maxValue: int) : int
Random.Next(minValue: int, maxValue: int) : int

property Form.BackColor: Color

type Color =
  struct
    member A : byte
    member B : byte
    member Equals : obj:obj -> bool
    member G : byte
    member GetBrightness : unit -> float32
    member GetHashCode : unit -> int
    member GetHue : unit -> float32
    member GetSaturation : unit -> float32
    member IsEmpty : bool
    member IsKnownColor : bool
    ...
  end

Full name: System.Drawing.Color

Color.FromArgb(argb: int) : Color
Color.FromArgb(alpha: int, baseColor: Color) : Color
Color.FromArgb(red: int, green: int, blue: int) : Color
Color.FromArgb(alpha: int, red: int, green: int, blue: int) : Color

Control.Show() : unit
Form.Show(owner: IWin32Window) : unit

type Application =
  static member AddMessageFilter : value:IMessageFilter -> unit
  static member AllowQuit : bool
  static member CommonAppDataPath : string
  static member CommonAppDataRegistry : RegistryKey
  static member CompanyName : string
  static member CurrentCulture : CultureInfo with get, set
  static member CurrentInputLanguage : InputLanguage with get, set
  static member DoEvents : unit -> unit
  static member EnableVisualStyles : unit -> unit
  static member ExecutablePath : string
  ...
  nested type MessageLoopCallback

Full name: System.Windows.Forms.Application

Application.Run() : unit
Application.Run(context: ApplicationContext) : unit
Application.Run(mainForm: Form) : unit

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More information

Link:	http://fssnip.net/p
Posted:	14 years ago
Author:	Tomas Petricek
Tags:	windows forms , form , random , color , events , tutorial , hello world