- Qt 5.15
- Qt Quick Demo - Calqlatr
- Qt 5.15.12 Reference Documentation

# 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()
                 }
             }
         }

     }