Qt Quick Demo - Calqlatr

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import QtQuick import QtQuick.Window Item { id: display property real fontSize: Math.floor(Screen.pixelDensity * 5.0) property bool enteringDigits: false property int maxDigits: (width / fontSize) + 1 property string displayedOperand property string errorString: qsTr("ERROR") property bool isError: displayedOperand === errorString function displayOperator(operator) { listView.model.append({ "operator": operator, "operand": "" }) enteringDigits = true listView.positionViewAtEnd() } function newLine(operator, operand) { displayedOperand = displayNumber(operand) listView.model.append({ "operator": operator, "operand": displayedOperand }) enteringDigits = false listView.positionViewAtEnd() } function appendDigit(digit) { if (!enteringDigits) listView.model.append({ "operator": "", "operand": "" }) var i = listView.model.count - 1; listView.model.get(i).operand = listView.model.get(i).operand + digit; enteringDigits = true listView.positionViewAtEnd() } function setDigit(digit) { var i = listView.model.count - 1; listView.model.get(i).operand = digit; listView.positionViewAtEnd() } function clear() { displayedOperand = "" if (enteringDigits) { var i = listView.model.count - 1 if (i >= 0) listView.model.remove(i) enteringDigits = false } } // Returns a string representation of a number that fits in // display.maxDigits characters, trying to keep as much precision // as possible. If the number cannot be displayed, returns an // error string. function displayNumber(num) { if (typeof(num) != "number") return errorString; var intNum = parseInt(num); var intLen = intNum.toString().length; // Do not count the minus sign as a digit var maxLen = num < 0 ? maxDigits + 1 : maxDigits; if (num.toString().length <= maxLen) { if (isFinite(num)) return num.toString(); return errorString; } // Integer part of the number is too long - try // an exponential notation if (intNum == num || intLen > maxLen - 3) { var expVal = num.toExponential(maxDigits - 6).toString(); if (expVal.length <= maxLen) return expVal; } // Try a float presentation with fixed number of digits var floatStr = parseFloat(num).toFixed(maxDigits - intLen - 1).toString(); if (floatStr.length <= maxLen) return floatStr; return errorString; } Item { id: theItem width: parent.width + 32 height: parent.height Rectangle { id: rect x: 16 color: "white" height: parent.height width: display.width - 16 } Image { anchors.right: rect.left source: "images/paper-edge-left.png" height: parent.height fillMode: Image.TileVertically } Image { anchors.left: rect.right source: "images/paper-edge-right.png" height: parent.height fillMode: Image.TileVertically } Image { id: grip source: "images/paper-grip.png" anchors.horizontalCenter: parent.horizontalCenter anchors.bottom: parent.bottom anchors.bottomMargin: 20 } ListView { id: listView x: 16; y: 30 width: display.width height: display.height - 50 - y delegate: Item { height: display.fontSize * 1.1 width: parent.width Text { id: operator x: 6 font.pixelSize: display.fontSize color: "#6da43d" text: model.operator } Text { id: operand font.pixelSize: display.fontSize anchors.right: parent.right anchors.rightMargin: 22 text: model.operand } } model: ListModel { } } } }