Re: [flexcoders] Re: How to get the reference to an item renderer given item index in dataProvide
Hi Gordon,
I actually found a use-case where I think this is needed. If you are
interested I'd be happy to discuss it with you off-list.
-Andy
On Mon, Apr 28, 2008 at 8:12 PM, Gordon Smith <[EMAIL PROTECTED]> wrote:
>Can you please explain your use case for needing a reference to an item
> renderer? As Tracy said, "You are probably making a mistake". Item renderers
> are intended to render data items, not to be manipulated directly as visual
> components.
>
>
>
> Gordon Smith
>
> Adobe Flex SDK Team
>
>
> --
>
> *From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On
> Behalf Of *Marcin Glowacki
> *Sent:* Monday, April 28, 2008 1:37 PM
> *To:* flexcoders@yahoogroups.com
>
> *Subject:* [flexcoders] Re: How to get the reference to an item renderer
> given item index in dataProvide
>
>
>
> Thanks, I will give it a shut
>
> --- In flexcoders@yahoogroups.com , "Tracy
> Spratt" <[EMAIL PROTECTED]> wrote:
> >
> > You are probably making a mistake, but, from the docs:
> >
> >
> >
> > indexToItemRenderer
> >
> > ()
> >
> > method
> >
> >
> >
> > public function indexToItemRenderer(index:int
> > <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
> > t.html> ):IListItemRenderer
> > <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
> > /controls/listClasses/IListItemRenderer.html>
> >
> > Get an item renderer for the index of an item in the data provider, if
> > one exists. Since item renderers only exist for items within the set of
> > viewable rows items, you cannot use this method for items that are not
> > visible.
> >
> > Parameters
> >
> >
> >
> > index:int
> > <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
> > t.html> - The offset into the data provider for an item
> >
> > Returns
> >
> >
> >
> > IListItemRenderer
> > <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
> > /controls/listClasses/IListItemRenderer.html> - The item renderer that
> > is displaying the item, or null if the item is not currently displayed
> >
> >
> >
> > Tracy
> >
> >
> >
> >
> >
> > From: flexcoders@yahoogroups.com [mailto:
> flexcoders@yahoogroups.com ] On
> > Behalf Of Marcin Glowacki
> > Sent: Monday, April 28, 2008 11:31 AM
> > To: flexcoders@yahoogroups.com
> > Subject: [flexcoders] Re: How to get the reference to an item renderer
> > given item index in dataProvide
> >
> >
> >
> > OK, thanks for your input.
> >
> > However, I would appreciate any hints on how I could write a method in
> > MyDataGrid that will return reference to itemRenderer or itemEditor or
> > null at any given point in time.
> >
> > If a given row is not displayed on the screen this method should
> > return null, otherwise itemRenderer or itemEditor.
> >
> > protected function getItemRendererByPosition(dateProviderIndex:int,
> > columnIndex:int):IDataRenderer
> > {
> > // go through all item renderers and return the one I need
> > // where are the renderers stored? any protected member?
> > // how can you tell current position of an item renderer?
> > }
> >
> > --- In flexcoders@yahoogroups.com flexcoders%40yahoogroups.com >
> > , "Tracy Spratt" wrote:
> > >
> > > You cannot do that.
> > >
> > >
> > >
> > > Item renderers are recycled. Only the visible rows are
> > > instantiated(plus a few buffers) So if row 5 is not visible, it does
> > > not exist, and you cannot reference it.
> > >
> > >
> > >
> > > In almost all cases, work should be done on the underlying
> > dataProvider.
> > >
> > >
> > >
> > > Search archives or google for: itemRenderer recycle
> > >
> > >
> > >
> > > Tracy
> > >
> > >
> > >
> > >
> > >
> > > From: flexcoders@yahoogroups.com flexcoders%40yahoogroups.com >
> > [mailto:flexcoders@yahoogroups.com flexcoders%40yahoogroups.com >
> > ] On
> > > Behalf Of Marcin Glowacki
> > > Sent: Sunday, April 27, 2008 3:21 PM
> > > To: flexcoders@yahoogroups.com flexcoders%40yahoogroups.com >
> > > Subject: [flexcoders] How to get the reference to an item renderer
> > given
> > > item index in dataProvider?
> > >
> > >
> > >
> > > In Flex 3 DataGrid, how to get the reference to item renderer given
> > > item index in dataProvider and column number?
> > > I am extending DataGrid, and I need to access it in MyDataGrid.
> > >
> > > Lets say I want itemRenderer for item in dataProvider at index 5 and
> > > column 2.
> > >
> > > And
> > >
> > > how to get the array of all itemRenderers and/or itemEditor for a
> > > given index of an item in dataProvider?
> > >
> >
>
>
>
RE: [flexcoders] Re: How to get the reference to an item renderer given item index in dataProvide
Can you please explain your use case for needing a reference to an item
renderer? As Tracy said, "You are probably making a mistake". Item
renderers are intended to render data items, not to be manipulated
directly as visual components.
Gordon Smith
Adobe Flex SDK Team
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Marcin Glowacki
Sent: Monday, April 28, 2008 1:37 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: How to get the reference to an item renderer
given item index in dataProvide
Thanks, I will give it a shut
--- In flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
, "Tracy Spratt" <[EMAIL PROTECTED]> wrote:
>
> You are probably making a mistake, but, from the docs:
>
>
>
> indexToItemRenderer
>
> ()
>
> method
>
>
>
> public function indexToItemRenderer(index:int
>
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
>
> t.html> ):IListItemRenderer
>
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
>
> /controls/listClasses/IListItemRenderer.html>
>
> Get an item renderer for the index of an item in the data provider, if
> one exists. Since item renderers only exist for items within the set
of
> viewable rows items, you cannot use this method for items that are not
> visible.
>
> Parameters
>
>
>
> index:int
>
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
>
> t.html> - The offset into the data provider for an item
>
> Returns
>
>
>
> IListItemRenderer
>
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
>
> /controls/listClasses/IListItemRenderer.html> - The item renderer that
> is displaying the item, or null if the item is not currently displayed
>
>
>
> Tracy
>
>
>
>
>
> From: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
[mailto:flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
] On
> Behalf Of Marcin Glowacki
> Sent: Monday, April 28, 2008 11:31 AM
> To: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
> Subject: [flexcoders] Re: How to get the reference to an item renderer
> given item index in dataProvide
>
>
>
> OK, thanks for your input.
>
> However, I would appreciate any hints on how I could write a method in
> MyDataGrid that will return reference to itemRenderer or itemEditor or
> null at any given point in time.
>
> If a given row is not displayed on the screen this method should
> return null, otherwise itemRenderer or itemEditor.
>
> protected function getItemRendererByPosition(dateProviderIndex:int,
> columnIndex:int):IDataRenderer
> {
> // go through all item renderers and return the one I need
> // where are the renderers stored? any protected member?
> // how can you tell current position of an item renderer?
> }
>
> --- In flexcoders@yahoogroups.com
<mailto:flexcoders%40yahoogroups.com>
<mailto:flexcoders%40yahoogroups.com>
> , "Tracy Spratt" wrote:
> >
> > You cannot do that.
> >
> >
> >
> > Item renderers are recycled. Only the visible rows are
> > instantiated(plus a few buffers) So if row 5 is not visible, it does
> > not exist, and you cannot reference it.
> >
> >
> >
> > In almost all cases, work should be done on the underlying
> dataProvider.
> >
> >
> >
> > Search archives or google for: itemRenderer recycle
> >
> >
> >
> > Tracy
> >
> >
> >
> >
> >
> > From: flexcoders@yahoogroups.com
<mailto:flexcoders%40yahoogroups.com>
<mailto:flexcoders%40yahoogroups.com>
> [mailto:flexcoders@yahoogroups.com
<mailto:flexcoders%40yahoogroups.com>
<mailto:flexcoders%40yahoogroups.com>
> ] On
> > Behalf Of Marcin Glowacki
> > Sent: Sunday, April 27, 2008 3:21 PM
> > To: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
<mailto:flexcoders%40yahoogroups.com>
> > Subject: [flexcoders] How to get the reference to an item renderer
> given
> > item index in dataProvider?
> >
> >
> >
> > In Flex 3 DataGrid, how to get the reference to item renderer given
> > item index in dataProvider and column number?
> > I am extending DataGrid, and I need to access it in MyDataGrid.
> >
> > Lets say I want itemRenderer for item in dataProvider at index 5 and
> > column 2.
> >
> > And
> >
> > how to get the array of all itemRenderers and/or itemEditor for a
> > given index of an item in dataProvider?
> >
>
[flexcoders] Re: How to get the reference to an item renderer given item index in dataProvide
Thanks, I will give it a shut
--- In flexcoders@yahoogroups.com, "Tracy Spratt" <[EMAIL PROTECTED]> wrote:
>
> You are probably making a mistake, but, from the docs:
>
>
>
> indexToItemRenderer
>
> ()
>
> method
>
>
>
> public function indexToItemRenderer(index:int
> <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
> t.html> ):IListItemRenderer
> <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
> /controls/listClasses/IListItemRenderer.html>
>
> Get an item renderer for the index of an item in the data provider, if
> one exists. Since item renderers only exist for items within the set of
> viewable rows items, you cannot use this method for items that are not
> visible.
>
> Parameters
>
>
>
> index:int
> <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
> t.html> - The offset into the data provider for an item
>
> Returns
>
>
>
> IListItemRenderer
> <http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
> /controls/listClasses/IListItemRenderer.html> - The item renderer that
> is displaying the item, or null if the item is not currently displayed
>
>
>
> Tracy
>
>
>
> ____
>
> From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
> Behalf Of Marcin Glowacki
> Sent: Monday, April 28, 2008 11:31 AM
> To: flexcoders@yahoogroups.com
> Subject: [flexcoders] Re: How to get the reference to an item renderer
> given item index in dataProvide
>
>
>
> OK, thanks for your input.
>
> However, I would appreciate any hints on how I could write a method in
> MyDataGrid that will return reference to itemRenderer or itemEditor or
> null at any given point in time.
>
> If a given row is not displayed on the screen this method should
> return null, otherwise itemRenderer or itemEditor.
>
> protected function getItemRendererByPosition(dateProviderIndex:int,
> columnIndex:int):IDataRenderer
> {
> // go through all item renderers and return the one I need
> // where are the renderers stored? any protected member?
> // how can you tell current position of an item renderer?
> }
>
> --- In flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
> , "Tracy Spratt" wrote:
> >
> > You cannot do that.
> >
> >
> >
> > Item renderers are recycled. Only the visible rows are
> > instantiated(plus a few buffers) So if row 5 is not visible, it does
> > not exist, and you cannot reference it.
> >
> >
> >
> > In almost all cases, work should be done on the underlying
> dataProvider.
> >
> >
> >
> > Search archives or google for: itemRenderer recycle
> >
> >
> >
> > Tracy
> >
> >
> >
> >
> >
> > From: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
> [mailto:flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
> ] On
> > Behalf Of Marcin Glowacki
> > Sent: Sunday, April 27, 2008 3:21 PM
> > To: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
> > Subject: [flexcoders] How to get the reference to an item renderer
> given
> > item index in dataProvider?
> >
> >
> >
> > In Flex 3 DataGrid, how to get the reference to item renderer given
> > item index in dataProvider and column number?
> > I am extending DataGrid, and I need to access it in MyDataGrid.
> >
> > Lets say I want itemRenderer for item in dataProvider at index 5 and
> > column 2.
> >
> > And
> >
> > how to get the array of all itemRenderers and/or itemEditor for a
> > given index of an item in dataProvider?
> >
>
RE: [flexcoders] Re: How to get the reference to an item renderer given item index in dataProvide
You are probably making a mistake, but, from the docs:
indexToItemRenderer
()
method
public function indexToItemRenderer(index:int
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
t.html> ):IListItemRenderer
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
/controls/listClasses/IListItemRenderer.html>
Get an item renderer for the index of an item in the data provider, if
one exists. Since item renderers only exist for items within the set of
viewable rows items, you cannot use this method for items that are not
visible.
Parameters
index:int
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/in
t.html> - The offset into the data provider for an item
Returns
IListItemRenderer
<http://127.0.0.1:58469/help/topic/com.adobe.flexbuilder.help/langref/mx
/controls/listClasses/IListItemRenderer.html> - The item renderer that
is displaying the item, or null if the item is not currently displayed
Tracy
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Marcin Glowacki
Sent: Monday, April 28, 2008 11:31 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: How to get the reference to an item renderer
given item index in dataProvide
OK, thanks for your input.
However, I would appreciate any hints on how I could write a method in
MyDataGrid that will return reference to itemRenderer or itemEditor or
null at any given point in time.
If a given row is not displayed on the screen this method should
return null, otherwise itemRenderer or itemEditor.
protected function getItemRendererByPosition(dateProviderIndex:int,
columnIndex:int):IDataRenderer
{
// go through all item renderers and return the one I need
// where are the renderers stored? any protected member?
// how can you tell current position of an item renderer?
}
--- In flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
, "Tracy Spratt" <[EMAIL PROTECTED]> wrote:
>
> You cannot do that.
>
>
>
> Item renderers are recycled. Only the visible rows are
> instantiated(plus a few buffers) So if row 5 is not visible, it does
> not exist, and you cannot reference it.
>
>
>
> In almost all cases, work should be done on the underlying
dataProvider.
>
>
>
> Search archives or google for: itemRenderer recycle
>
>
>
> Tracy
>
>
>
>
>
> From: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
[mailto:flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
] On
> Behalf Of Marcin Glowacki
> Sent: Sunday, April 27, 2008 3:21 PM
> To: flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
> Subject: [flexcoders] How to get the reference to an item renderer
given
> item index in dataProvider?
>
>
>
> In Flex 3 DataGrid, how to get the reference to item renderer given
> item index in dataProvider and column number?
> I am extending DataGrid, and I need to access it in MyDataGrid.
>
> Lets say I want itemRenderer for item in dataProvider at index 5 and
> column 2.
>
> And
>
> how to get the array of all itemRenderers and/or itemEditor for a
> given index of an item in dataProvider?
>
[flexcoders] Re: How to get the reference to an item renderer given item index in dataProvide
OK, thanks for your input.
However, I would appreciate any hints on how I could write a method in
MyDataGrid that will return reference to itemRenderer or itemEditor or
null at any given point in time.
If a given row is not displayed on the screen this method should
return null, otherwise itemRenderer or itemEditor.
protected function getItemRendererByPosition(dateProviderIndex:int,
columnIndex:int):IDataRenderer
{
// go through all item renderers and return the one I need
// where are the renderers stored? any protected member?
// how can you tell current position of an item renderer?
}
--- In flexcoders@yahoogroups.com, "Tracy Spratt" <[EMAIL PROTECTED]> wrote:
>
> You cannot do that.
>
>
>
> Item renderers are recycled. Only the visible rows are
> instantiated(plus a few buffers) So if row 5 is not visible, it does
> not exist, and you cannot reference it.
>
>
>
> In almost all cases, work should be done on the underlying dataProvider.
>
>
>
> Search archives or google for: itemRenderer recycle
>
>
>
> Tracy
>
>
>
>
>
> From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
> Behalf Of Marcin Glowacki
> Sent: Sunday, April 27, 2008 3:21 PM
> To: flexcoders@yahoogroups.com
> Subject: [flexcoders] How to get the reference to an item renderer given
> item index in dataProvider?
>
>
>
> In Flex 3 DataGrid, how to get the reference to item renderer given
> item index in dataProvider and column number?
> I am extending DataGrid, and I need to access it in MyDataGrid.
>
> Lets say I want itemRenderer for item in dataProvider at index 5 and
> column 2.
>
> And
>
> how to get the array of all itemRenderers and/or itemEditor for a
> given index of an item in dataProvider?
>
