[Solved] Help with Counter in Delegate

dengineer

I have this code that some what works. If I scroll through the model till the end all the minutes count down correctly. But if I don't do anything than only the minutes on the view get updated..

I can't do the following:

Update Model's values
Start Trigger on non-visible delegates

Any help would be appreciated.

Video of the Problem:
"Your text to link here...":http://www.youtube.com/watch?v=6dL3KuybwWM

Here is the sample code:
@import QtQuick 1.1
import com.nokia.meego 1.0

Page {
tools: commonTools

ListView {
     id: mainListView
     x: 0
     y: 70
     width: 480;
     height: 400
     clip: true
     boundsBehavior: Flickable.DragAndOvershootBounds
     cacheBuffer: 0
     snapMode: ListView.NoSnap
     orientation: ListView.Horizontal
     flickableDirection: Flickable.HorizontalFlick
     model: mainListViewXML;
     delegate:  myDelegate;
}

XmlListModel {
id:mainListViewXML
source: "http://nextbart.info/etd.php?station=12th";
query: "/nextbart/etd"
XmlRole { name: "minutes"; query: "@minutes/string()"; }

     onStatusChanged: {
             if (status === XmlListModel.Ready)
             {
                 // Method #2
                 updateMinutes.start()
             }
  }




     }

Timer {
id: updateMinutes
interval: 6000 ;
running: false;
repeat: true
onTriggered: {

      var xcount = mainListViewXML.count,
          i;

      for (i=0; i< xcount; i++)
      {
        var xmin  = parseFloat(mainListViewXML.get(i).minutes) - 1;
          mainListViewXML.setData(i,minutes,xmin)
      }
  }

  }

Component{
id: myDelegate

Item {

   width: 160;

             Timer {
                 interval: 9000; running: true; repeat: true
                 onTriggered: {
                     //! Method #1 (Only Updates visible minutes)
                     var xmin  = parseFloat(trainMinutes.text) - 1;
                     trainMinutes.text = xmin;
                 }
              }

             Text {
                 id: trainMinutes
                 text: minutes
                 font.bold: true
                 color: "#000000"
                 smooth: true
                 x: 40
                 y: 70
                 width: 86
                 height: 68
                 opacity: 1
             }
         }

}
}

@

Here is a sample screen of 3 numbers on the screen.

!http://i.imgur.com/2HF3N.png(3 Numbers)!
Note: There are lots of more trains but only these 3 get updated if you don't scroll.

mbrasser

A couple things you could try:

Regarding Method 1: ListView only creates visible delegates (that is, if the model has 10 items but the ListView can only display 3 items, it will not create the other 7). If you set a large cacheBuffer value it will force creation of all the items, and the Timer in the delegate method should work.
Regarding Method 1: Assuming the XML data is automatically updated, you could try changing your timer to call mainListViewXML.reload(), which will pull the latest file from the network and re-parse it.

Regards,
Michael

dengineer

Thanks Michael, I updated the cacheBuffer based on mainListViewXML.count, which seems to be working fine now.

@ //! Reset Buffer
mainListView.cacheBuffer = 160*mainListViewXML.count;@

I don't know how much the cache buffer affects the memory usage, but I would rather load the items than reload the XML.