How to resolve the algorithm GUI enabling/disabling of controls step by step in the LiveCode programming language

Published on 12 May 2024 09:40 PM
#Livecode

How to resolve the algorithm GUI enabling/disabling of controls step by step in the LiveCode programming language

Table of Contents

Problem Statement

In addition to fundamental GUI component interaction, an application should dynamically enable and disable GUI components, to give some guidance to the user, and prohibit (inter)actions which are inappropriate in the current state of the application.

Similar to the task GUI component interaction, 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, increment its value with the "increment" button, or decrement the value with the "decrement" button. The input field should be enabled only when its value is zero. The "increment" button only as long as the field's value is less then 10: When the value 10 is reached, the button should go into a disabled state. Analogously, the "decrement" button should be enabled only as long as the value is greater than zero. Effectively, the user can now either increment up to 10, or down to zero. Manually entering values outside that range is still legal, but the buttons should reflect that and enable/disable accordingly.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm GUI enabling/disabling of controls step by step in the LiveCode programming language

Source code in the livecode programming language

command enableButtons v
    switch
        case v <= 0
            put 0 into fld "Field1"
            set the enabled of btn "Button1" to true            
            set the enabled of btn "Button2" to false
            break
        case v >= 10
            put 10 into fld "Field1"
            set the enabled of btn "Button1" to false            
            set the enabled of btn "Button2" to true            
            break
        default
            set the enabled of btn "Button1" to true            
            set the enabled of btn "Button2" to true            
            put v into fld "Field1"
    end switch
end enableButtons

on mouseUp
    put field "Field1" into x
    add 1 to x
    enableButtons x
end mouseUp

on mouseUp
    put field "Field1" into x
    subtract 1 from x
    enableButtons x
end mouseUp

on rawKeyDown k
    if numToChar(k) is among the items of "1,2,3,4,5,6,7,8,9,0" then
        if (numToChar(k) + the text of me) <= 10 then
            enableButtons (numToChar(k) + the text of me)
        end if
    else if k = 65288 then 
        pass rawKeyDown
    end if
end rawKeyDown

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