[SailfishDevel] [bug] Silica ComboBox.qml - can't set currentIndex after initialization

[Thomas Amler]

I'm using this workaround:

Component.onCompleted: {
         listid = parseInt(DB.getTaskProperty(taskid, "ListID"))
         DB.readLists()
         listLocatedIn.currentIndex = listindex
         listLocatedIn.currentItem = listLocatedIn.menu.children[listindex]
}

Am 05.01.2015 um 11:40 schrieb Andrey Kozhevnikov:
> yeah, i'm using _updating = false in my application also. This is the 
> best workaround i found.
>
> 29.12.2014 19:45, ok1hlm at centrum.cz пишет:
>> Hi,
>>
>> I've found a bug in ComboBox.qml used in Jolla phone. I wrote an 
>> application using pyotherside. During initialization, it populates 
>> combobox and sets the currentIndex to saved value. The problem is, 
>> that setting the currentIndex does nothing.
>>
>> ComboBox.qml uses weird timer to delay some tasks. When you change 
>> currentIndex before that timer is triggered, it ignores the change.
>>
>> Connections {
>>      target: comboBox.menu ? comboBox.menu._contentColumn : null
>>      onChildrenChanged: {
>>          // delay the reload in case there are more children changes 
>> to come
>>          if (!updateCurrentTimer.running) {
>>              _updating = true
>>              updateCurrentTimer.start()
>>          }
>>      }
>> }
>>
>> VS.
>>
>> onCurrentIndexChanged: {
>>      _currentIndexSet = true
>>      if (_completed && !_updating) {
>>          _updating = true
>>          _updateCurrent(currentIndex, null)
>>          _updating = false
>>      }
>> }
>>
>> My application does something like:
>>
>> function foo(result) {
>>    for(var i=0; i<result.length; ++i)
>>      combolistmodel.append({index:i, text:result[i]});
>> }
>> foo(['abc','def','foo','bar','baz']);
>> // comboid._updating = 0; // REQUIRED WORKAROUND
>> comboid.currentIndex=3;
>>
>> Whey I force the _updating to 'false', it works. Also if I set the 
>> correntIndex in a timer some time later, it works.
>>
>> I've tested following workaround:
>>
>> onCurrentIndexChanged: {
>>      _currentIndexSet = true
>>      if (_completed) {
>>        if (updateCurrentTimer.running) {
>>          var save_currentIndex = currentIndex;
>>          updateCurrentTimer.stop()
>>          updateCurrentTimer.onTriggered()
>>          currentIndex = save_currentIndex;
>>        }
>>        if (!_updating) {
>>          _updating = true
>>          _updateCurrent(currentIndex, null)
>>          _updating = false
>>        }
>>      }
>> }
>>
>> But it still seems odd to me to use a timer in in a combobox.
>>
>> Whole reproducer: http://fpaste.org/164044/59940141/
>> Code causing this problem: http://fpaste.org/163881/97171141/
>> Tested workaround: http://fpaste.org/164045/85997614/
>>
>>
>> Michal
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