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One Card! - Multiplayer Card Game

 import QtQuick 2.0
 import Felgo 3.0
 import "../common"

 // enables when the player has 2 or less cards in his hand
 Item {
   id: onuButton
   width: 110
   height: 110

   property alias button: button
   property alias blinkAnimation: blinkAnimation

   // effect plays when the user activates the ONUButton
   SoundEffect {
     volume: 0.5
     id: onuSound
     source: "../../assets/snd/onu.wav"
   }

   // button starts the fade animation when enabled changes
   ButtonBase {
     id: button
     radius: width/2
     enabled: false
     anchors.fill: parent

     onClicked: {
       // do not react to clicks if ONUButton is set invisible (= removed from the game / not available for users)
       if(onuButton.visible) {
         ga.logEvent("User", "ONU", "singlePlayer", multiplayer.singlePlayer)
         flurry.logEvent("User.ONU", "singlePlayer", multiplayer.singlePlayer)
         button.enabled = false
         onu(multiplayer.localPlayer.userId)
       }
     }

     onEnabledChanged: {
       if (enabled){
         blinkAnimation.start()
       } else {
         blinkAnimation.stop()
       }
     }
   }

   // darker deactivated button image
   Image {
     id: onuButton1
     anchors.fill: parent
     source: "../../assets/img/ONUButton1.png"
     smooth: true
   }

   // lighter activated button image
   Image {
     id: onuButton2
     anchors.fill: parent
     source: "../../assets/img/ONUButton2.png"
     opacity: 0
     smooth: true
   }

   // fade animation between the two button images
   SequentialAnimation {
     id: blinkAnimation
     running: false
     loops: Animation.Infinite
     alwaysRunToEnd: true

     NumberAnimation { target: onuButton2; property: "opacity"; easing.type: Easing.InOutQuad; to: 1.0; duration: 400 }
     NumberAnimation { target: onuButton2; property: "opacity"; easing.type: Easing.InOutQuad; to: 0.0; duration: 400 }
   }

   // activate the player's onu state
   function onu(userId){
     onuSound.play()
     var hand = gameLogic.getHand(userId)
     if (hand) hand.onu = true