How to resolve the algorithm GUI component interaction step by step in the F# programming language

Published on 12 May 2024 09:40 PM
#F_Sharp

How to resolve the algorithm GUI component interaction step by step in the F# programming language

Table of Contents

Problem Statement

Almost every application needs to communicate with the user in some way. Therefore, a substantial part of the code deals with the interaction of program logic with GUI components. Typically, the following is needed:

For a minimal "application", write a program that presents a form with three components to the user:

The field is initialized to zero. The user may manually enter a new value into the field, or increment its value with the "increment" button. Entering a non-numeric value should be either impossible, or issue an error message. Pressing the "random" button presents a confirmation dialog, and resets the field's value to a random value if the answer is "Yes". (This task may be regarded as an extension of the task Simple windowed application).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm GUI component interaction step by step in the F# programming language

Source code in the fsharp programming language

// GUI component interaction. Nigel Galloway: June 13th., 2020
let n=new System.Windows.Forms.Form(Size=new System.Drawing.Size(250,150))
let i=new System.Windows.Forms.TextBox(Location=new System.Drawing.Point(30,30),Text="0")
let g=new System.Windows.Forms.Label(Location=new System.Drawing.Point(135,33),Text="Value")
let e=new System.Windows.Forms.Button(Location=new System.Drawing.Point(30,70),Text="Increment")
let l=new System.Windows.Forms.Button(Location=new System.Drawing.Point(135,70),Text="Random")
n.Controls.AddRange([|i;g;e;l|])
let rand=new System.Random()
i.Leave.AddHandler(new System.EventHandler(fun _ _->i.Text<-try string(int(i.Text)) with |_->"0"))
e.Click.AddHandler(new System.EventHandler(fun _ _->i.Text<-(string(int(i.Text)+1))))
l.Click.AddHandler(new System.EventHandler(fun _ _->i.Text<-(string(rand.Next()))))
System.Windows.Forms.Application.Run(n)

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