| /**************************************************************************** |
| ** |
| ** 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 = "" |
| } |
| } |
| |