Qt 4.7: calculator.js Example File (demos/declarative/calculator/Core/calculator.js)

Qt Reference Documentation

# calculator.js Example File

demos/declarative/calculator/Core/calculator.js

     var curVal = 0
     var memory = 0
     var lastOp = ""
     var timer = 0

     function disabled(op) {
         if (op == "." && display.text.toString().search(/\./) != -1) {
             return true
         } else if (op == squareRoot &&  display.text.toString().search(/-/) != -1) {
             return true
         } else {
             return false
         }
     }

     function doOperation(op) {
         if (disabled(op)) {
             return
         }

         if (op.toString().length==1 && ((op >= "0" && op <= "9") || op==".") ) {
             if (display.text.toString().length >= 14)
                 return; // No arbitrary length numbers
             if (lastOp.toString().length == 1 && ((lastOp >= "0" && lastOp <= "9") || lastOp == ".") ) {
                 display.text = display.text + op.toString()
             } else {
                 display.text = op
             }
             lastOp = op
             return
         }
         lastOp = op

         if (display.currentOperation.text == "+") {
             display.text = Number(display.text.valueOf()) + Number(curVal.valueOf())
         } else if (display.currentOperation.text == "-") {
             display.text = Number(curVal) - Number(display.text.valueOf())
         } else if (display.currentOperation.text == multiplication) {
             display.text = Number(curVal) * Number(display.text.valueOf())
         } else if (display.currentOperation.text == division) {
             display.text = Number(Number(curVal) / Number(display.text.valueOf())).toString()
         } else if (display.currentOperation.text == "=") {
         }

         if (op == "+" || op == "-" || op == multiplication || op == division) {
             display.currentOperation.text = op
             curVal = display.text.valueOf()
             return
         }

         curVal = 0
         display.currentOperation.text = ""

         if (op == "1/x") {
             display.text = (1 / display.text.valueOf()).toString()
         } else if (op == "x^2") {
             display.text = (display.text.valueOf() * display.text.valueOf()).toString()
         } else if (op == "Abs") {
             display.text = (Math.abs(display.text.valueOf())).toString()
         } else if (op == "Int") {
             display.text = (Math.floor(display.text.valueOf())).toString()
         } else if (op == plusminus) {
             display.text = (display.text.valueOf() * -1).toString()
         } else if (op == squareRoot) {
             display.text = (Math.sqrt(display.text.valueOf())).toString()
         } else if (op == "mc") {
             memory = 0;
         } else if (op == "m+") {
             memory += display.text.valueOf()
         } else if (op == "mr") {
             display.text = memory.toString()
         } else if (op == "m-") {
             memory = display.text.valueOf()
         } else if (op == leftArrow) {
             display.text = display.text.toString().slice(0, -1)
             if (display.text.length == 0) {
                 display.text = "0"
             }
         } else if (op == "Off") {
             Qt.quit();
         } else if (op == "C") {
             display.text = "0"
         } else if (op == "AC") {
             curVal = 0
             memory = 0
             lastOp = ""
             display.text ="0"
         }
     }