Data binding occurs after onAdded() in CellRenderer?

Hi all, I extend the qnx.ui.listClasses.CellRenderer for my TileList. I noticed that sometimes the this.data would be null in my overridden onAdded() function.

After some tests, I realized that if I use a timer to check this.data seconds later, it would be filled with the correct data, it seems that the data binding happens a moment after the onAdded() function is called.

I'm happy to rely on the timer to the time delay, but someone has a better solution? Is there something else I should listen to instead of according to onAdded()?

Hey,.

This kind of thing makes me forget all sleep haha clearly that I don't SLEEP much at all!

OK, so I think I got the fix for this. instead of simply relying on onAdded() method that we must look in the drawLabel() method. in the contstructor this time, we do the new CheckBox object where our customization starts later with so we don't have duplicates of this object that is created each time the drawLabel method is called. instead of making the bulk of the work in the onAdded method, we will just to remove the object from the label that is displayed via the cell rendering engine. After that when the drawLabel() method is called, which is when we do our customization. mine includes a checkbox just to test. then we finally remove our object as usual in the onRemoved() method.

Here's the code for update for the rendering engine:

package
{
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.text.TextFieldAutoSize;

    import qnx.ui.buttons.CheckBox;
    import qnx.ui.buttons.LabelPlacement;
    import qnx.ui.listClasses.AlternatingCellRenderer;
    import qnx.ui.listClasses.List;
    import qnx.ui.text.Label;

    public class MyCustomCellRenderer extends AlternatingCellRenderer
    {
        /*
        * Place the object out here so that other methods can
        * access it
        */
        private var newCheckBox:CheckBox;

        public function MyCustomCellRenderer()
        {
            super();

            /*
             * Add the checkbox here so we dont keep re-adding a check box
             * whenever the onAdded method is called. other wise there
             * would be a lot of objects for checkbox
            */
            newCheckBox = new CheckBox();
        }
        override protected function onAdded():void
        {
            super.onAdded();

            /*
             * Do not want to use the label object at all. we want
             * to fully customize our cell renderer. for some reason
             * the label object is not considered a child object
             * when the drawLabel method is called so we must
             * removed it in this method where it is considered a
             * child object
            */
            removeChild(label);
        }
        override protected function drawLabel():void
        {
            if (this.data)
            {
                /*
                 * Sometimes this function is called prematurely when there
                 * is no data object available and it is null so we only
                 * do our custom label when there is a data object available
                */
                newCheckBox.width = 500;
                newCheckBox.label = this.data.label;
                newCheckBox.labelPadding = 10;
                newCheckBox.labelPlacement = LabelPlacement.RIGHT;
                newCheckBox.setPosition(10,10);

                addChild(newCheckBox);
            }
        }
        override protected function onRemoved():void
        {
            super.onRemoved();

            /*
            * Remember to remove the checkbox object
            */
            removeChild(newCheckBox);

        }
    }
}

I tested it on a list of single column and also a tilelist component and how it works to 100%. Let me know if I missed something. happy you raised this point! Good luck!

Tags: BlackBerry Developers

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