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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| import QtQuick 2.0 |
| import QtQuick.Window 2.0 |
| |
| 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 { } |
| } |
| |
| } |
| |
| } |