[flexcoders] Re: MenuBar using databinding

Tim Hoff Tue, 16 May 2006 21:41:02 -0700

That's cool Graham. I might use your solution as well, until the
MenuBar XML items allow databinding.

Later,
Tim

--- In [email protected], Graham Weldon <[EMAIL PROTECTED]>
wrote:
>
> Hi Tim,
>
> I like your concept, but I don't feel that it will be practical
for the
> situation in which I want to use it.
>
> I have this data binding working on a tool bar, which I can define
> completely with MXML... (detailed below).
>
> Note that some of the names have changed since my last post, but
you can
> see since I have a complete MXML implementation, using no
ActionScript.
> This allows me to insert using the curly-brace notation for data
binding
> directly to the ModelLocator. This method works fine, and I have
for the
> moment installed a temporary button that toggles the state of some
of
> these ACTION_ENABLED variables and have verified that this works
> wonderfully.
>
> Perhaps there is a way to define a MenuBar completely in MXML, to
allow
> this data binding option also? I'm not certain since the
documentation
> for MenuBars varies depending on where you are reading it.
>
> Regards,
> Graham Weldon
>
> ================================================================
> <mx:Canvas
>     xmlns:mx="http://www.adobe.com/2006/mxml"
>     styleName="myToolbar">
>
>     
>     
>     <mx:LinkButton
>         styleName="myToolbarButton"
>         id="toolbar_fileNew"
>         toolTip="New"
>         icon="@Embed('images/icons/ck_6.gif')"
>         disabledIcon="@Embed('images/icons/ck_6_off.gif')"
>         width="25"
>         height="25"
>         enabled="{ModelLocator.getInstance
().ACTION_ENABLED__FILE_NEW}"
>         x="0"/>
>
>     <mx:LinkButton
>         styleName="myToolbarButton"
>         id="toolbar_fileOpen"
>         toolTip="Open"
>         icon="@Embed('images/icons/ck_1.gif')"
>         disabledIcon="@Embed('images/icons/ck_1_off.gif')"
>         width="25"
>         height="25"
>         enabled="{ModelLocator.getInstance
().ACTION_ENABLED__FILE_OPEN}"
>         x="25"/>
>     
>
> </mx:Canvas>
>
> ================================================================
>
>
>
>
> Tim Hoff wrote:
>
> > Yeah, I was afraid of that. You would probably have to dispatch
an
> > event that is listened for by the view, when you want to
> > enable/disable menu options. The listening function would do
> > something like this:
> >
> > private function enableMenuItems(mb:MenuBar):void
> >       {
> >       for (var i:int = 0; i < 2; i++)
> >                   {
> >                         mb.getMenuAt(i).enabled =
> > ModelLocator.getInstance().enabledMenuArray(i).enabledValue;
> >                   }
> >       }
> >
> > Not true binding, but it might work. This code has errors, but
you
> > get the idea. Just brainstorming.
> >
> > -TH
> >
> > --- In [email protected], Graham Weldon <graham.weldon@>
> > wrote:
> > >
> > > Hi Tim,
> > >
> > > Curly braces dont work for data binding within ActionScript in
the
> > > manner you suggest:
> > > *    Expecting colon before dot.
> > > *    Syntax Error: rightbrace is unexpected.
> > > *    Expecting rightbrace before semicolon.
> > >
> > > Those are the compile errors encountered. Perhaps there is
another
> > wya
> > > to use dataBinding from ActionScript? Or alternatively, there
may
> > be a
> > > way to completely define this component in MXML, allowsin us to
> > use the
> > > curly-brace notation for databinding?
> > >
> > > Regards,
> > > Graham Weldon
> > >
> > >
> > >
> > >
> > > Tim Hoff wrote:
> > >
> > > > Did you try this: (curly braces for binding)
> > > >
> > > > <menuItem label="New" enabled="' +
> > > >             { ModelLocator.getInstance
> > ().ACTION_ENABLED_FILE_NEW }
> > > > + '"/>
> > > >
> > > > --- In [email protected], "Graham Weldon"
> > > > <graham.weldon@> wrote:
> > > > >
> > > > > I've asked this question previously, but in a slightly
> > different
> > > > > manner, and since its post, I ahve managed to make some
> > progress.
> > > > >
> > > > > I have created a new MXML component that represents a
MenuBar
> > with
> > > > > some items within that will not change except for their
enabled
> > > > value.
> > > > > I am building this on top of the Cairngorm framework 2.0
beta,
> > > > which
> > > > > means I'm taking advantage of the ModelLocator construct.
> > > > >
> > > > > I have a collection of ENABLED indicators stored on the
> > > > ModelLocator,
> > > > > which will be changed at varying points in the programs
> > execution.
> > > > > These states need to enable and disable the options in the
> > menu.
> > > > >
> > > > > Here is a snippet of what I am using, which works great for
> > > > indicating
> > > > > the initial required enabled or disabled state, but does
not
> > > > update as
> > > > > the variables change...
> > > > >
> > > > > Any thoughts on how to restructure this to allow the
options to
> > > > update
> > > > > in real time with data binding, rather than being set upon
> > > > > instantiation and initialisation of the component.
> > > > >
> > > > > Thanks in advance!
> > > > >
> > > > > Regards,
> > > > > Graham Weldon
> > > > >
> > > > >
> > > > > ==============================================
> > > > >
> > > > > import mx.collections.XMLListCollection;
> > > > >
> > > > > [Bindable]
> > > > > private var menuXML : XMLListCollection = new
> > > > > XMLListCollection(rawMenuXML);
> > > > > [Bindable]
> > > > > private var rawMenuXML : XMLList = XMLList(
> > > > >     '<menuItem label="File" enabled="' +
> > > > >         ModelLocator.getInstance().ACTION_ENABLED_FILEMENU
> > + '">' +
> > > > >
> > > > >         '<menuItem label="New" enabled="' +
> > > > >             ModelLocator.getInstance
().ACTION_ENABLED_FILE_NEW
> > > > + '"/>' +
> > > > >         '<meunItem label="Open" enabled="' +
> > > > >             ModelLocator.getInstance
().ACTION_ENABLED_FILE_OPEN
> > > > + '"/>' +
> > > > >
> > > > >     '</menuItem>'
> > > > >     );
> > > > >
> > > > >
> > > > >
> > > > > <mx:MenuBar
> > > > >     labelField="@label"
> > > > >     xmlns:mx="http://www.adobe.com/2006/mxml"
> > > > >     dataProvider="{menuXML}"/>
> > > > >
> > > > > ==============================================
> > > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
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[flexcoders] Re: MenuBar using databinding

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