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"use strict";
// replace_with_your_name - Lab 2 js file.
/** @global {boolean} */
let calculatorOn; // Remember if the calculator is on or off.
/** @global {string} */
let currentNumberEntered; // The current number entered and shown in the display.
/** @global {string} */
let memoryStore; // Used for MRC/M-/M+ buttons.
/** @global {string} */
let operationClicked; // The operation [%+x-÷] that was clicked.
/** @global {string} */
let previousAreaClicked; // The previous area that was clicked.
/** @global {string} */
let previousNumberEntered; // The previous number entered.
/** @global {string} */
let previousOperand_2; // The previous second operand. Used for following on = calculations.
function _Initialize() {
turnCalculatorOff();
}
/**
* Perform the calculator button function.
*
* @param {string} numberClicked - The value of the button that was clicked.
*/
function addKeyToCurrentNumberEntered(numberClicked) {
if (Number(currentNumberEntered)) {
currentNumberEntered += numberClicked;
} else {
currentNumberEntered = numberClicked;
}
} // END addKeyToCurrentNumberEntered.
/**
* Get the calculator display value.
*
* @return {string} The current display string.
*/
function getDisplay() {
return document.getElementById('calculatorDisplay').innerText;
} // END getDisplay.
/**
* Perform the calculator button function.
*
* @param {object} e - The area that was clicked on.
* @return (false) Stops the area href from being opened.
*/
function performCalculatorButton(e) {
let btnClicked = e.title;
console.log(`performCalculatorButton[] btnClicked = ${btnClicked}`);
if (calculatorOn) {
switch (btnClicked) {
case '1':
previousAreaClicked = btnClicked;
addKeyToCurrentNumberEntered(btnClicked);
setDisplay(currentNumberEntered);
break;
case 'on':
if (calculatorOn) {
turnCalculatorOff();
}
break;
default:
console.log(`${btnClicked} not programmed.`);
}
} else {
turnCalculatorOn();
}
return false;
} // END performCalculatorButton.
/**
* Turn on and reset the calculator global variables.
*/
function resetCalculator() {
currentNumberEntered = '';
memoryStore = '0';
previousAreaClicked = '';
previousNumberEntered = '0';
} // END resetCalculator.
/**
* Turn off the calculator.
*/
function turnCalculatorOff() {
console.log('turnCalculatorOff[]');
calculatorOn = false;
document.getElementById('calculatorDisplay').style.backgroundColor = 'black';
} // END turnCalculatorOff.
/**
* Turn on and reset the calculator.
*/
function turnCalculatorOn() {
console.log('turnCalculatorOn[]');
calculatorOn = true;
resetCalculator();
setDisplay(currentNumberEntered);
document.getElementById('calculatorDisplay').style.backgroundColor = 'silver';
} // END turnCalculatorOn.
/**
* Set the calculator display value.
*
* @param {object} displayValue - The value to display.
*/
function setDisplay(displayValue) {
document.getElementById('calculatorDisplay').innerText = displayValue;
} // END setDisplay.