Merge data into filtered ArrayCollection (maybe by using IViewCursor or localIndex?)

Question

I have a Flex question, which isn\'t as easy as it seems at first.

At least I\'m struggling since 1 week with it.

I have prepared a test case and a screensho

Answer 1

Try to operate ArrayCollection's source property the following way:

    
        
    

    
    = 0; i--)
            {
                for (j = data.length - 1; j >= 0; j--)
                {
                    if (sourceData[i] == data[j])
                        continue found1;
                }
                var index:int = _data.getItemIndex(sourceData[i]);
                if (index > -1)
                    _data.removeItemAt(index); // remove visible items
                else
                    sourceData.splice(i, 1); // remove hidden (filtered) items
            }

            // 2) add items appeared in data to _data
            found2: for (j = 0; j < data.length; j++)
            {
                for (i = 0; i < sourceData.length; i++)
                {
                    if (sourceData[i] == data[j])
                        continue found2;
                }
                _data.addItem(data[j]);
            }
        }

        private function radioClicked(event:Event):void
        {
            switch (filterGroup.selection)
            {
                case allButton:
                {
                    _data.filterFunction = null;
                    break;
                }
                case oddButton:
                {
                    _data.filterFunction = filterOdd;
                    break;
                }
                case evenButton:
                {
                    _data.filterFunction = filterEven;
                    break;
                }
            }
            _data.refresh();
        }
    ]]>
    

    
        
    

    
        
        
        
        
    

    

    
    
    
    
    
    

And a couple of advices on using RadioButton and RadioButtonGroup:

• Do not use click events to handle changes. This disables possibility to manage buttons other way (from keyboard for example). Use change instead.
• If you are using RadioButtonGroup it is better to refer group rather than groupName. It gives you possibility to check problems on compile time (imagine some misprints in group name).
• Do not check selected button against label. You can misprint label name or you can change label etc. and compiler can't help you in that.