Qt Quick Demo - Calqlatr

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import QtQuick 2.0
import "content"
import "content/calculator.js" as CalcEngine

Rectangle {
    id: window
    width: 320
    height: 480
    focus: true
    color: "#272822"

    onWidthChanged: controller.reload()
    onHeightChanged: controller.reload()

    function operatorPressed(operator) {
        CalcEngine.operatorPressed(operator)
        numPad.buttonPressed()
    }
    function digitPressed(digit) {
        CalcEngine.digitPressed(digit)
        numPad.buttonPressed()
    }
    function isButtonDisabled(op) {
        return CalcEngine.disabled(op)
    }

    Item {
        id: pad
        width: 180
        NumberPad { id: numPad; y: 10; anchors.horizontalCenter: parent.horizontalCenter }
    }

    AnimationController {
        id: controller
        animation: ParallelAnimation {
            id: anim
            NumberAnimation { target: display; property: "x"; duration: 400; from: -16; to: window.width - display.width; easing.type: Easing.InOutQuad }
            NumberAnimation { target: pad; property: "x"; duration: 400; from: window.width - pad.width; to: 0; easing.type: Easing.InOutQuad }
            SequentialAnimation {
                NumberAnimation { target: pad; property: "scale"; duration: 200; from: 1; to: 0.97; easing.type: Easing.InOutQuad }
                NumberAnimation { target: pad; property: "scale"; duration: 200; from: 0.97; to: 1; easing.type: Easing.InOutQuad }
            }
        }
    }

    Keys.onPressed: {
        if (event.key == Qt.Key_0)
            digitPressed("0")
        else if (event.key == Qt.Key_1)
            digitPressed("1")
        else if (event.key == Qt.Key_2)
            digitPressed("2")
        else if (event.key == Qt.Key_3)
            digitPressed("3")
        else if (event.key == Qt.Key_4)
            digitPressed("4")
        else if (event.key == Qt.Key_5)
            digitPressed("5")
        else if (event.key == Qt.Key_6)
            digitPressed("6")
        else if (event.key == Qt.Key_7)
            digitPressed("7")
        else if (event.key == Qt.Key_8)
            digitPressed("8")
        else if (event.key == Qt.Key_9)
            digitPressed("9")
        else if (event.key == Qt.Key_Plus)
            operatorPressed("+")
        else if (event.key == Qt.Key_Minus)
            operatorPressed("−")
        else if (event.key == Qt.Key_Asterisk)
            operatorPressed("×")
        else if (event.key == Qt.Key_Slash)
            operatorPressed("÷")
        else if (event.key == Qt.Key_Enter || event.key == Qt.Key_Return)
            operatorPressed("=")
        else if (event.key == Qt.Key_Comma || event.key == Qt.Key_Period)
            digitPressed(".")
        else if (event.key == Qt.Key_Backspace)
            operatorPressed("backspace")
    }

    Display {
        id: display
        x: -16
        width: window.width - pad.width
        height: parent.height

        MouseArea {
            id: mouseInput
            property real startX: 0
            property real oldP: 0
            property bool rewind: false

            anchors {
                bottom: parent.bottom
                left: parent.left
                right: parent.right
            }
            height: 50
            onPositionChanged: {
                var reverse = startX > window.width / 2
                var mx = mapToItem(window, mouseInput.mouseX, mouseInput.mouseY).x
                var p = Math.abs((mx - startX) / (window.width - display.width))
                if (p < oldP)
                    rewind = reverse ? false : true
                else
                    rewind = reverse ? true : false
                controller.progress = reverse ? 1 - p : p
                oldP = p
            }
            onPressed: startX = mapToItem(window, mouseInput.mouseX, mouseInput.mouseY).x
            onReleased: {
                if (rewind)
                    controller.completeToBeginning()
                else
                    controller.completeToEnd()
            }
        }
    }

}