I'm using a Menu control. Normally I'd catch the Menu's control event and then
act on whatever selection the user made with something like a switch block.
But I wanted to see if I could be more clever and embed the function name and
parameters in the XML Menu data provider itself, like this:
<mx:XML id="xmlFormMenuOptions" >
<Menu id="MenuOptions">
<menuitem id="AddNewChartMenuOption" label="Add Chart..."
callback="AddNewChartButton_click" arguments="" />
<menuitem id="RenameChartMenuOption" label="Rename Chart..."
callback="PopUpTextBox" arguments="RenameChart, RenameChartButtonTextBox,
{nameChartSelected}" enabled="{selectedChartingPanelTableCell}" />
<menuitem id="DeleteChartMenuOption" label="Delete Chart"
callback="PopUpCheckBox" arguments="DeleteChart, DeleteChartButtonCheckBox"
enabled="{selectedChartingPanelTableCell}" />
<menuitem id="RaiseChartOrderMenuOption" label="Raise Chart Order"
callback="RaiseChartOrderButton_click" arguments=""
enabled="{RaiseChartOrderButton.enabled}" />
<menuitem id="LowerChartOrderMenuOption" label="Lower Chart Order"
callback="LowerChartOrderButton_click" arguments=""
enabled="{LowerChartOrderButton.enabled}" />
<menuitem id="OpenAlertsWindowMenuOption" label="Open Alerts Window"
callback="ProjectProperties.setValue" arguments="ShowAlertsWindow, true" />
<menuitem id="ChartingPanelWhatAmIMenuOption" label="What am I?"
callback="PopUpMessage" arguments="ChartingPanelWhatAmIMenuOption, null " />
<menuitem id="HelpMenuOption" label="Help" callback="" />
</Menu>
</mx:XML>
If you look at each <menuitem/> you'll see a 'callback' attribute and an
'arguments' attribute. The arguments are comma-delineated that I need to parse
into an Array and scrub: for example, by converting string references into real
ones like this:
if( this.hasOwnProperty(arg) )
arrayArguments[i] = this[arg];
I then have been successful in using the callLater function like this:
callLater(this[callback], arrayArguments);
So far so good - it works great!
But I've hit a tiny snag. If the function is in a foreign class then everything
falls apart. For example, this won't work:
callback = "ProjectProperties.setValue"
arguments = "ShowAlertsWindow, true"
Because there is no such thing as this[ProjectProperties.setValue] the
callLater function can't handle it. I can easily build a little stub but I'm
hoping to keep things clean and elegant.
I've been searching for a way to call-by-name in Flex but haven't found one
(except for callLater). Is there a way I can do this?
