Hi,
Ok DataGrids have been the bane of my life recently due to various
reasons and I have made some significant headway with various issues I
have had. My last (fingers crossed) problematic area I have decided
to throw out there as enough is enough :)
http://www.nutrixinteractive.com/apps/datagrid_example/
(view source is enabled)
Here is a comparison example I have been working on with the grid on
the left built to show a couple of problems I had right at the start.
The grid on the right was my fixed and working grid, that is until I
tested with a larger record set and yet another issue came to rise :(
The problem is simple and occurs sporadically but I must have this
working 100%. Only one check box should be selected at a time. If
you select a checkbox, scroll about a bit, then scroll down and select
another checkbox then scroll madly up and down you will notice that
the selected check box un-selects. Now this does not occur all the
time as I said and pretty much is fairly solid but the point is it
does happen so I could really do with some eyes on this to come up
with an explanation please?
The main methods handling the checkbox selection are:
In the default application:
private function onChange( e:ListEvent ):void
{
for ( var i:int = 0; i < e.itemRenderer.parent.numChildren; i ++ )
{
if( e.itemRenderer.parent.getChildAt(i) is CheckBox
&& e.itemRenderer.parent.getChildAt(i) != e.target
&&
CheckBox(e.itemRenderer.parent.getChildAt(i)).selected != false )
{
CheckBox(e.itemRenderer.parent.getChildAt(i)).selected
= false;
}
}
}
In the renderer:
override protected function commitProperties():void
{
super.commitProperties();
if (owner is ListBase)
{
if( ListBase(owner).isItemSelected(data) == true
&& data['row'] == listData.rowIndex
&& data['col'] == listData.columnIndex ) selected =
true;
else selected = false;
}
}
override protected function clickHandler(event:MouseEvent):void
{
super.clickHandler(event);
this.visible = false;
data['col'] = listData.columnIndex;
data['row'] = listData.rowIndex;
// Not sure if we need to but visuals i.e. visibility has changed so
best do it
invalidateDisplayList();
// Dispatch an event picked up by the datagrid which will deselect
cb's
dispatchEvent( new ListEvent( ListEvent.CHANGE, true, false,
listData.columnIndex, listData.rowIndex, null, this ) );
}
