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import QtQuick 2.0

Item {
    id: button
    property alias text: textItem.text
    property color color: "#eceeea"
    property color btnBg: "#333333"

    property bool operator: false
    property bool dimmable: false
    property bool dimmed: false
    property bool backSpaceDisplay: false
    property real btnOpacity: 1

    width:(calculator.width/* - 4 * 16*/) / 5
    height: smallScreen ? 42 : 80
    Rectangle {
        color: btnBg
        width: parent.width
        height:parent.height
        anchors.centerIn: parent
//        radius: parent.width / 2
        opacity: btnOpacity
        Image {
            anchors.centerIn: parent
            width: 50
            height: 40
            id: backSpaceIcon
            source: backSpaceDisplay ? "qrc:/calculator/images/backspace.png" : ""
        }
    }

    Text {
        id: textItem
        font.pixelSize: 30
        font.bold: true
        wrapMode: Text.WordWrap
        anchors.centerIn: parent
        //lineHeight: 0.75
        opacity: btnOpacity
        color: (dimmable && dimmed) ? Qt.darker(button.color) : button.color
        Behavior on color { ColorAnimation { duration: 120; easing.type: Easing.OutElastic} }
        states: [
            State {
                name: "pressed"
                when: mouse.pressed && !dimmed
                PropertyChanges {
                    target: textItem
                    color: Qt.lighter(button.color)
                }
            }
        ]
    }

    MouseArea {
        id: mouse
        anchors.fill: parent
        anchors.margins: -5
        onClicked: {
            if (operator)
                calculator.operatorPressed(parent.text)
            else
                calculator.digitPressed(parent.text)
        }
        onPressed: btnOpacity = 0.5
        onReleased: btnOpacity = 1
    }

    function updateDimmed() {
        dimmed = calculator.isButtonDisabled(button.text)
    }

    Component.onCompleted: {
        numPad.buttonPressed.connect(updateDimmed)
        updateDimmed()
    }
}