Qt Quick Demo - Calqlatr | Qt 6.2

- Qt 6.2
- Qt Quick Demo - Calqlatr
- Qt 6.2.4 Reference Documentation

# Qt Quick Demo - Calqlatr

     /****************************************************************************
     **
     ** Copyright (C) 2017 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and The Qt Company. For licensing terms
     ** and conditions see https://www.qt.io/terms-conditions. For further
     ** information use the contact form at https://www.qt.io/contact-us.
     **
     ** BSD License Usage
     ** Alternatively, you may use this file under the terms of the BSD license
     ** as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     var curVal = 0
     var memory = 0
     var lastOp = ""
     var previousOperator = ""
     var digits = ""

     function disabled(op) {
         if (digits == "" && !((op >= "0" && op <= "9") || op == "."))
             return true
         else if (op == '=' && previousOperator.length != 1)
             return true
         else if (op == "." && digits.toString().search(/\./) != -1) {
             return true
         } else if (op == "√" &&  digits.toString().search(/-/) != -1) {
             return true
         } else {
             return false
         }
     }

     function digitPressed(op)
     {
         if (disabled(op))
             return
         if (digits.toString().length >= display.maxDigits)
             return
         if (lastOp.toString().length == 1 && ((lastOp >= "0" && lastOp <= "9") || lastOp == ".") ) {
             digits = digits + op.toString()
             display.appendDigit(op.toString())
         } else {
             digits = op
             display.appendDigit(op.toString())
         }
         lastOp = op
     }

     function operatorPressed(op)
     {
         if (disabled(op))
             return
         lastOp = op

         if (op == "±") {
                 digits = Number(digits.valueOf() * -1)
                 display.setDigit(display.displayNumber(digits))
                 return
             }

         if (previousOperator == "+") {
             digits = Number(digits.valueOf()) + Number(curVal.valueOf())
         } else if (previousOperator == "−") {
             digits = Number(curVal.valueOf()) - Number(digits.valueOf())
         } else if (previousOperator == "×") {
             digits = Number(curVal) * Number(digits.valueOf())
         } else if (previousOperator == "÷") {
             digits = Number(curVal) / Number(digits.valueOf())
         }

         if (op == "+" || op == "−" || op == "×" || op == "÷") {
             previousOperator = op
             curVal = digits.valueOf()
             digits = ""
             display.displayOperator(previousOperator)
             return
         }

         if (op == "=") {
             display.newLine("=", digits.valueOf())
         }

         curVal = 0
         previousOperator = ""

         if (op == "1/x") {
             digits = (1 / digits.valueOf()).toString()
         } else if (op == "x^2") {
             digits = (digits.valueOf() * digits.valueOf()).toString()
         } else if (op == "Abs") {
             digits = (Math.abs(digits.valueOf())).toString()
         } else if (op == "Int") {
             digits = (Math.floor(digits.valueOf())).toString()
         } else if (op == "√") {
             digits = Number(Math.sqrt(digits.valueOf()))
             display.newLine("√", digits.valueOf())
         } else if (op == "mc") {
             memory = 0;
         } else if (op == "m+") {
             memory += digits.valueOf()
         } else if (op == "mr") {
             digits = memory.toString()
         } else if (op == "m-") {
             memory = digits.valueOf()
         } else if (op == "backspace") {
             digits = digits.toString().slice(0, -1)
             display.clear()
             display.appendDigit(digits)
         } else if (op == "Off") {
             Qt.quit();
         }

         // Reset the state on 'C' operator or after
         // an error occurred
         if (op == "C" || display.isError) {
             display.clear()
             curVal = 0
             memory = 0
             lastOp = ""
             digits = ""
         }
     }