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Date: Fri, 14 Mar 2014 13:40:51 +0000 (UTC)
From: "Gary Yang (JIRA)" <jira@apache.org>
To: issues@flex.apache.org
Message-ID: <JIRA.12701347.1394742285869.69272.1394804451240@arcas>
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References: <JIRA.12701347.1394742285869@arcas>
Subject: [jira] [Comment Edited] (FLEX-34143) Give <fx:Binding /> an event
 handle.
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    [ https://issues.apache.org/jira/browse/FLEX-34143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13934436#comment-13934436 ] 

Gary Yang edited comment on FLEX-34143 at 3/14/14 1:40 PM:
-----------------------------------------------------------

According to my knowledge, Flex Binding depend on two kinds of events:

1) PropertyChangedEvent, which will trigger binding when a)there is a [Bindable] for a class, and any of it's public property changed; b) a public property with [Bindable];

2) Any event with event type in property getter's [Bindable( event="eventTypeTriggeringBinding")], which will trigger binding when it is dispatched.

a binding is always:

        <fx:Binding source="a.b.c.d" changeHandle="onSomeChanged"/>
        <fx:Binding source="e.f.g.h" changeHandle="onSomeChanged"/>

What I am expecting to know is which of [ a, b, c, d, e, f, g, h ] 's change triggering the handler, NOT the source event( could be anything even MouseDown which is totally out of Binding's scope);

I'm sorry for the confusion.

Please see http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf69084-7cc5.html for more about Binding and events.

Thank you!


was (Author: flashflexpro):
According to my knowledge, Flex Binding depend on two kinds of events:

1) PropertyChangedEvent, which will trigger binding when a)there is a [Bindable] for a class, and any of it's public property changed; b) a public property with [Bindable];

2) Any event with event type in property getter's [Bindable( event="eventTypeTriggeringBinding")], which will trigger binding when it is dispatched.

a binding is always:

        <fx:Binding source="a.b.c.d" destination~~~~

What I am expecting to know is which of [ a, b, c, d ] 's change triggering the handler, NOT the source event( could be anything event MouseDown, totally out of Binding's scope);

I'm sorry for the confusion.


> Give <fx:Binding /> an event handle.
> ------------------------------------
>
>                 Key: FLEX-34143
>                 URL: https://issues.apache.org/jira/browse/FLEX-34143
>             Project: Apache Flex
>          Issue Type: Improvement
>          Components: Data Binding
>            Reporter: Gary Yang
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> 1st of all, Flex Binding is great!!!
> I am using it this way:
> >>>>>>>>>>>>>>>>>code>>>>>>>>>>>>
>  <fx:Script><![CDATA[
>         [Bindable("dataChange")]
>         public function get rowData():VLogicTreeGridRow{
>             return data as VLogicTreeGridRow;
>         }
>         private var _cellData:VLogicTreeGridCell;
>         [Bindable(event="cellDataChanged")]
>         public function get cellData():VLogicTreeGridCell{
>             return _cellData;
>         }
>         private function set rfrCellData( v:* ):void{
>             if( rowData != null
>                     && logicTreeGrid.columns != null && logicTreeGrid.columns.length > 0
>                     && rowData.cellList != null && rowData.cellList.length > 0
>                     ){
>                 var idx:int = logicTreeGrid.columns.getItemIndex( treeGridColLogic );
>                 var rt:VLogicTreeGridCell = rowData.cellList.getItemAt( idx ) as VLogicTreeGridCell;
>                 if( _cellData != rt ){
>                     _cellData = rt;
>                     dispatchEvent( new Event( "cellDataChanged" ) );
>                 }
>             }
>         }
>         ]]></fx:Script>
>     <ui:layout>
>         <s:HorizontalLayout paddingTop="2" paddingBottom="2" paddingLeft="2" paddingRight="2"/>
>     </ui:layout>
>     <fx:Binding source="logicTreeGrid.columns.length" destination="rfrCellData"/>
>     <fx:Binding source="rowData.cellList.length" destination="rfrCellData"/>
> <<<<<<<<<<<<<<<code<<<<<<<<<<<<
> Because the destination of Binding tag can only be setters, I have to use it this way if I want to handle changes from the Binding sources,  do you think it's possible to add a handle for Binding tag so that I can see exactly what event caused the change please?
> So that it can be like this
> >>>>>>>>>>>>>>>>>code>>>>>>>>>>>>
>         private function refreshCellData( ev:Event ):void{
>             if( ev is CollectionEvent ){
>                 
>             }
>             else if( ev is PropertyChangeEvent ){
>                 
>             }
>             if( rowData != null
>                     && logicTreeGrid.columns != null && logicTreeGrid.columns.length > 0
>                     && rowData.cellList != null && rowData.cellList.length > 0
>                     ){
>                 var idx:int = logicTreeGrid.columns.getItemIndex( treeGridColLogic );
>                 var rt:VLogicTreeGridCell = rowData.cellList.getItemAt( idx ) as VLogicTreeGridCell;
>                 if( _cellData != rt ){
>                     _cellData = rt;
>                     dispatchEvent( new Event( "cellDataChanged" ) );
>                 }
>             }
>         }
>         ]]></fx:Script>
>     <ui:layout>
>         <s:HorizontalLayout paddingTop="2" paddingBottom="2" paddingLeft="2" paddingRight="2"/>
>     </ui:layout>
>     <fx:Binding source="logicTreeGrid.columns.length" changeHandle="refreshCellData"/>
>     <fx:Binding source="rowData.cellList.length" changeHandle="refreshCellData"/>
> <<<<<<<<<<<<<<<code<<<<<<<<<<<<
> This is going to be very useful!!!


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