Display.qml Example File
demos/calqlatr/content/Display.qml
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
}
}
function displayNumber(num) {
if (typeof(num) != "number")
return errorString;
var intNum = parseInt(num);
var intLen = intNum.toString().length;
var maxLen = num < 0 ? maxDigits + 1 : maxDigits;
if (num.toString().length <= maxLen) {
if (isFinite(num))
return num.toString();
return errorString;
}
if (intNum == num || intLen > maxLen - 3) {
var expVal = num.toExponential(maxDigits - 6).toString();
if (expVal.length <= maxLen)
return expVal;
}
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 { }
}
}
}