ParticleSystem doesn't always show until device interacted with

Allstar12345

Hi,

I use QML ParticleSystem to show a little snow effect in my App for winter, but for some reason it's very intermittent when it shows, some App launches it is visible straight away and others I have to interact with the App in some ways (Open a menu or push a page onto the stack for example) which causes it to abruptly show.

I'm using Qt 5.6 on Sailfish OS (yeah we are still stuck on 5.6 yey)

This is the code:

 ParticleSystem {
            id: particleSys
            Component.onCompleted: {checkIfAllowed();}
            function startSnow(){emitter.burst(emitter.emitRate)}
            function checkIfAllowed(){var month=Qt.formatDateTime (new Date(), "MM");
      if(appsettings.getSystemSetting("snowEffect", "")==="true"){
        if(month==="11"){startSnow();}
        else if(month==="12"){startSnow();}
        else if(month==="01"){startSnow();}
        else if(month==="02"){startSnow();}
        else{emitter.destroy();imgpart.destroy();particleSys.destroy();} }
            }
            }

        Emitter{
              id: emitter
              focus:true
              startTime: 10
              anchors{top:parent.top;}
              height:parent.height/1.5; width: parent.width
              system: particleSys
              emitRate: 15
              layer.enabled: true
              lifeSpan: 3000
              lifeSpanVariation: 300
              maximumEmitted: 800
              size: 4
              endSize: 30
              velocity: TargetDirection{
                  targetX: 0; targetY: 0
                  targetVariation: 360
                  magnitude: 150
                  targetItem: pillButton
              }
          }

          ImageParticle{
              id: imgpart
              color:lightTheme? "black": "white"
              source:"images/snowflake.png"
              system: particleSys
          }

I've shot a tiny video to show what it's doing:

Qt Particle bug

If anyone has any ideas please do share them :)