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TextBox And Button Control in F-Sharp

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Viewed:  1065 
Posted On:  05/10/2012 22:18:18 
This article is a demonstration of TextBox and Button controls in F#. Here both controls are used for the implementation of a Book Song Example. Have a quick review to learn. 

Introduction

Today I am going to explain F# Textbox and Button controls by implementing a Book Song example. The Book Song example will show the song for 60 books until zero book. Both the controls TextBox and Button are used in the example. First we have created a form then we added controls to the Form.

TextBox

A TextBox control is used to display information entered either by you/user at design time or by an assignment statement in the code. A TextBox purpose is to allow the user to input Text to be used by the program. We use a single line text box or set the property to single line when only one line of input is required and set the property to multiline when more than one line of input is required.

Some TextBoxes are not editable; they are only used for displaying text. A TextBox is based on custom logic rules. In GUI programming, you will handle custom events provided by the TextBox to know when to execute your logic rules. The text displayed by a TextBox can be accessed using the TextBox Text property. A TextBox can contain zero, one or two scrollbars.

Button

Buttons are mainly used to start, end or interrupt a process. A button can be pressed either by clicking it by a mouse or by tabbing to it and than pressing enter. The Button is mainly used to initiate action. The caption Property determines the text to display on the face on the Button. If we set the Cancel property of the Button to true the Button will be activated from anywhere in the form by pressing the Esc key.

We can also invoke a Button's click event by setting up an "access key" for it. From the user point of view a Button is useful when clicked, in which case the user positions the mouse on it and presses one of the mouse buttons. The classic button is called a Command Button. A Button needs a container or host. The Container could be a form, a toolbar etc.
Properties of TextBox

Properties

Description

BackColor

Get/set the background color of the control.

ContextMenu

Get/set the shortcut menu associated with the control

Height

Get/set the height of the control

Margin

Get/set the space between control

Name

Get/set the name of the control

Site

Get/set site of the control

Text

Get/set the current Text in the TextBox


Properties Of Button

Properties

Description

Name

Get/set the name of the Button

Site

Get/set the site of the Button

Width

Get/set the width of the Button

ForeColor

Get/set the foreground color of the control

BackColor

Get/set the background color of the control

Font

Get/set the font of the Text displayed by the control

Size

Get/set the height and width of the control


Getting Started
Step1- Open a new project in F# using Visual Studio 2010 and give a name to it.

Text1.png

Figure 1.

Step2- Click on Program.fs file in Solution Explorer.

text2.png

Figure 2.

Step3- Write the following code in the Program.fs window; your window will look like below.

Text3.png

Figure 3.

#light

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

let
BookSong =
let strbSong = new StringBuilder()
let append (s:string) = strbSong.Append(s) |> ignore
for a = 60 downto 0 do
if
(a = 0) then
append("\nNo more book of F# on the library, no more book of F#." +
"\nGo to the store and buy some more, 60 book of F# on the library.")
else
let n = a - 1
let plural = if (a = 1) then "" else "s"
append (sprintf "\n%d book%s of F# on the library, %d book%s" a plural a plural);
append "\nTake one down and pass it around, ";
match n with
| 1 -> append "1 book "
| 0 -> append " no more book "
| _ -> append (sprintf "%d book of F# on the library.\n" n)
strbSong.ToString()
let form = new Form(Width=500, Height=420,
Visible=true, TopMost=true,
FormBorderStyle=FormBorderStyle.FixedSingle,
Text="Book counting Song")
let txtBox = new RichTextBox(Size=new Size(480, 350),
Location=new Point(5, 5),
Text=BookSong)
form.Controls.Add(txtBox)
let btnExit = new Button(Location=new Point(408, 360), Text="Exit")
btnExit.Click.Add (fun _ -> form.Close())
form.Controls.Add(btnExit)

[<STAThread>]
do Application.Run(form)

Step4- Now press F5 to execute the code.
Output

TExt4.png

Figure 4.

Text5.png

Figure 5.

Summary
In this article I have discussed the TextBox and Button controls in F#.

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