Here's the example. Right click to view/download code. Look at RowColorDataGrid.as component, near the bottom.
http://www.iepl.net/DataGridRowColorSample/DataGridRowColorSample.html
-TH
--- In [email protected], "Pan Troglodytes" <[EMAIL PROTECTED]> wrote:
>
> I don't understand why that would fail. What is actualRow? Is it the last
> parameter passed into drawRowBackground()? That's what you should be
> using. If that's what it is, can you post a small example that reproduces
> you problem?
>
> I'm using the method Matt posting and it's working great. So there must be
> some small detail throwing things off.
>
> On 7/25/06, Tim Hoff [EMAIL PROTECTED] wrote:
> >
> > Jason,
> >
> > Thanks for the response. If I was using an ArrayCollection outside
> > of the subclassed DataGrid component, that makes sense. However,
> > inside the component, I'm not having any luck accessing the
> > dataProvider and/or underlying data with any method. I tried the
> > following line, but it comes up blank.
> >
> > rowData = dataProvider.getItemAt(actualRow,0);
> >
> > Again, it may just be something that I'm doing wrong through
> > subclassing; like setter/getter or something similar.
> >
> > -TH
> >
> > --- In [email protected], "Pan Troglodytes"
> > chimpathetic@ wrote:
> > >
> > > Matt just means to use getItemAt(dataIndex) to get the item for
> > row. Then
> > > you can use whatever field/property to make your decision on how
> > to color
> > > it. Make sense?
> > >
> > > On 7/25/06, Tim Hoff TimHoff@ wrote:
> > > >
> > > > Matt, or anyone else,
> > > >
> > > > Similar to your suggestion, I've been creating a sample that
> > shows how to
> > > > set the row color of a DataGrid. When you say, "get data at
> > dataIndex
> > > > using dataProvider methods", how exactly do you go about this.
> > Manish
> > > > suggested looking at the iterator. I've tried this, as well as
> > listData,
> > > > dataProvider and several others. The problem is that none of
> > them are
> > > > returning the actual data in individual cells. I'm sure that my
> > thick head
> > > > is just missing something simple. The following sample shows
> > where I'm at
> > > > with this currently. If you have any tips or advise that can
> > help me get
> > > > over this hurdle, I would greatly appreciate it. This won't be
> > a component
> > > > for sale, but rather a sample for free.
> > > >
> > > >
> > DataGridRowColorSample<http://www.iepl.net/DataGridRowColorSample/Dat
> > aGridRowColorSample.html>
> > > > - See RowColorDataGrid.as near the bottom.
> > > >
> > > > Thanks,
> > > > Tim Hoff
> > > >
> > > >
> > > > --- In [email protected], "Matt Chotin" <mchotin@>
> > wrote:
> > > > >
> > > > > For dealing with the row backgrounds maybe you could look into
> > > > > subclassing DataGrid and overriding drawRowBackground?
> > > > >
> > > > >
> > > > >
> > > > > override protected function drawRowBackground(s:Sprite
> > > > >
> > <http://livedocs.macromedia.com/flex/2/langref/flash/display/Sprite.h
> > tml
> > > > > > , rowIndex:int
> > > > > <http://livedocs.macromedia.com/flex/2/langref/int.html> ,
> > y:Number
> > > > > <http://livedocs.macromedia.com/flex/2/langref/Number.html> ,
> > > > > height:Number
> > > > > <http://livedocs.macromedia.com/flex/2/langref/Number.html> ,
> > color:uint
> > > > > <http://livedocs.macromedia.com/flex/2/langref/uint.html> ,
> > > > > dataIndex:int
> > <http://livedocs.macromedia.com/flex/2/langref/int.html>
> > > > > ):void
> > > > >
> > <http://livedocs.macromedia.com/flex/2/langref/specialTypes.html#void
> > >
> > > >
> > > > >
> > > > > {
> > > > >
> > > > > //get data at dataIndex using dataProvider methods
> > > > >
> > > > > //var colorToUse:uint = dataIsSpecial ? customColor : color;
> > > > >
> > > > > Super.drawRowBackground(s, rowIndex, y, height, colorToUse,
> > dataIndex);
> > > > >
> > > > > }
> > > > >
> > > > >
> > > > >
> > > > > That could eliminate a lot of the extra renderers?
> > > > >
> > > > >
> > > > >
> > > > > Matt
> > > > >
> > > > > ________________________________
> > > > >
> > > > > From: [email protected]
> > [mailto:[EMAIL PROTECTED] On
> > > > > Behalf Of Pan Troglodytes
> > > > > Sent: Friday, July 21, 2006 7:42 AM
> > > > > To: [email protected]
> > > > > Subject: Re: [flexcoders] performance issues
> > > > >
> > > > >
> > > > >
> > > > > Yeah, I've tried that. Here's the the actual full code I'm
> > using:
> > > > >
> > > > > override public function set data(value:Object):void {
> > > > > var dirty:Boolean = (value != null) && (data != value);
> > > > > super.data = "">> > > > >
> > > > > if (dirty) {
> > > > > var n:Number = data[DataGridListData(listData).dataField];
> > > > > if (n < 0)
> > > > > setStyle("color", negativeColor);
> > > > > else if (n > 0)
> > > > > setStyle("color", positiveColor);
> > > > > else if (n == 0)
> > > > > setStyle("color", zeroColor);
> > > > > }
> > > > > }
> > > > >
> > > > > As I mentioned before, the main slowness is not just scrolling
> > a row at
> > > > > a time but whole pages. The hit is coming in when it has to
> > set the
> > > > > data on every itemRenderer onscreen at once. This usually
> > happens when
> > > > > scrolling by quickly dragging the scroll thumb.
> > > > >
> > > > > And yes, there are a lot of records on-screen. Probably about
> > 45. If I
> > > > > shrink it, performance gets better. It's probably also hurting
> > that all
> > > > > eight columns have to be itemRenderers, because I need to
> > color the row
> > > > > background on a per-row basis depending on the data. Only one
> > of the
> > > > > rows are something other than simple text. What I think might
> > help the
> > > > > most is to build a smarter datagrid that knows how to do some
> > events at
> > > > > the grid level ( e.g. set the styling of each cell depending
> > on the
> > > > > data) rather than forcing anything other than plain text
> > that's the same
> > > > > on every row to use a custom renderer.
> > > > >
> > > > > As for ben's reply, I believe it fires every time any row
> > scrolls into
> > > > > and out of view is because it reuses renderers, setting the
> > data instead
> > > > > of creating a whole new renderer. When you scroll down, the
> > top row
> > > > > gets reused as the new bottom row. Found this out when I didn't
> > > > > properly invalidate my colored backgrounds.
> > > > >
> > > > > On 7/21/06, Matt Chotin mchotin@ wrote:
> > > > >
> > > > > Well DataGrid scrolling performance is something that we've
> > spent a lot
> > > > > of time tuning so I would love for us to get a full test case
> > that we
> > > > > can look at. I saw in the thread you linked mentioning a
> > 1600x1200
> > > > > monitor, is the DataGrid taking up most of that real estate?
> > The more
> > > > > visible rows the slower the scrolling will be. Another thing
> > you could
> > > > > look at is in your setter for the data comparing against the
> > old value
> > > > > and if it hasn't changed not doing anything, it may be that
> > it's
> > > > > invalidating too often? I'll ask one of the people who worked
> > on
> > > > > performance if she has any thoughts.
> > > > >
> > > > >
> > > > >
> > > > > Matt
> > > > >
> > > > >
> > > > >
> > > > > ________________________________
> > > > >
> > > > > From: [email protected]
> > [mailto:[email protected] ] On
> > > > > Behalf Of Pan Troglodytes
> > > > > Sent: Wednesday, July 19, 2006 11:44 PM
> > > > > To: [email protected]
> > > > > Subject: [flexcoders] performance issues
> > > > >
> > > > >
> > > > >
> > > > > Well, specifically I had a DataGrid using this for the
> > itemRenderer:
> > > > >
> > > > > package nes {
> > > > >
> > > > > import mx.controls.dataGridClasses.DataGridListData ;
> > > > > import mx.controls.Label;
> > > > >
> > > > > public class SignColorItemRenderer extends Label {
> > > > > public var negativeColor:uint = 0xFF0000;
> > > > > public var positiveColor:uint = 0x008000;
> > > > > public var zeroColor:uint;
> > > > >
> > > > > override public function set data(value:Object):void {
> > > > > super.data = "">> > > > >
> > > > > var n:Number = data[DataGridListData(listData).dataField];
> > > > > if (n < 0)
> > > > > setStyle("color", negativeColor);
> > > > > else if (n > 0)
> > > > > setStyle("color", positiveColor);
> > > > > else if (n == 0)
> > > > > setStyle("color", zeroColor);
> > > > > }
> > > > > }
> > > > > }
> > > > >
> > > > > I brought it up in this thread:
> > > > >
> > http://groups.yahoo.com/group/flexcoders/message/43243;_ylc=X3oDMTM3c
> > WM2
> > > > >
> > MG9mBF9TAzk3MzU5NzE0BGdycElkAzEyMjg2MTY3BGdycHNwSWQDMTYwMDAwNzIwNwRtc
> > 2dJ
> > > > >
> > ZAM0MzI2MwRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzExNTI4NTY4NDUEdHBjSWQDNDMyN
> > DM-
> > > > >
> > > > > I tried LOADS of different ways to do it. I found that anytime
> > I put
> > > > > much of any extra code in, it took away from the
> > responsiveness. Even
> > > > > replacing the above data procedure with just a single setStyle
> > > > > statement. As I said, it's not horrible. But I definitely
> > notice it.
> > > > >
> > > > > The other main thing I can point out is some sluggishness when
> > resizing
> > > > > the browser window and having it resize/relayout the Flex app.
> > But it's
> > > > > hard to tell how much of that is the browser and how much is
> > Flex.
> > > > >
> > > > > On 7/20/06, Matt Chotin < mchotin@ <mailto:mchotin@ >
> > > >
> > > > > wrote:
> > > > >
> > > > > Can you provide a little more detail on the performance areas
> > that are
> > > > > hurting you? If there's a sample that demonstrates the speed
> > issue it
> > > > > may be something we can look at.
> > > > >
> > > > >
> > > > >
> > > > > Matt
> > > > >
> > > > >
> > > > >
> > > > > ________________________________
> > > > >
> > > > > From: [email protected] [mailto:
> > [email protected]
> > > > > <mailto:[email protected] ] On Behalf Of Pan
> > Troglodytes
> > > > > Sent: Wednesday, July 19, 2006 10:49 PM
> > > > > To: [email protected]
> > > > > Subject: Re: [flexcoders] So? What are folks here actually
> > building...?
> > > > >
> > > > >
> > > > >
> > > > > Well, since I have never programmed in ActionScript at all, my
> > projects
> > > > > have served a dual purpose - functional and educational. In
> > other
> > > > > words, some of the software may never see the light of day but
> > that's
> > > > > okay - at least it taught me how to build in Flex.
> > > > >
> > > > > My most "real" application has been an ad-hoc query builder.
> > We have
> > > > > some financial reporting that it broken down into various
> > fields:
> > > > > branch, quarter, period, that kind of thing. So I gave each
> > field an
> > > > > accordion pane and filled it with the values for that field.
> > Then I let
> > > > > the user drag-n-drop the values for each field into another
> > List,
> > > > > arranging them hierarchically however they want. This then
> > feeds a sql
> > > > > statement that uses group by and rollup to get all the data
> > both on the
> > > > > detail level and summarized by each parent level.
> > > > >
> > > > > I then feed that into a DataGrid that has many custom
> > renderers. The
> > > > > main powerhouse is the "tree" renderer. Basically, the first
> > column
> > > > > down the page looks like a tree of those key fields. So if
> > they chose
> > > > > to report by quarter, then branch, then manager, it would look
> > like:
> > > > >
> > > > > (view the following in a fixed width font)
> > > > > Gross Expenses Profit
> > > > > Total X X X
> > > > > 1Q-2006 X X X
> > > > > Branch 1 X X X
> > > > > Jane Doe X X X
> > > > > John Smith X X X
> > > > > Branch 2 X X X
> > > > > Phil Johnson X X X
> > > > > 2Q-2006 X X X
> > > > > Branch 1 X X X
> > > > > Jane Doe X X X
> > > > > John Smith X X X
> > > > > Branch 2 X X X
> > > > > Phil Johnson X X X
> > > > >
> > > > > I put in Xs because I got tired of making up stuff. But you
> > get the
> > > > > picture. It's basically very pivot-table-ish. It's really the
> > > > > graphical touches that seal the deal. There's icons and
> > animations and
> > > > > colors all over the place. Not too much, but more than I could
> > have
> > > > > coded in the week or so I've been building it. I'm an
> > experienced
> > > > > Delphi user and have to say I'm really blown away by Flex.
> > Delphi is
> > > > > RAD but Flex is RAD^2.
> > > > >
> > > > > Okay, for my VERY basic advice on what I would put some effort
> > into.
> > > > > Well, first, fix the bugs that have come out here. You have a
> > pretty
> > > > > wide base of components already and I would like them to be
> > very stable.
> > > > > Nothing slows a developer down more than spending hours on a
> > problem to
> > > > > only find the bug isn't in his/her code.
> > > > >
> > > > > Second, I would REALLY like to see some optimization done. I
> > know this
> > > > > is going to be hard with the dynamic, frequently untyped
> > nature of Flex.
> > > > > But some of the code runs painfully slow for what it does. I'm
> > still
> > > > > not 100% happy with the speed of those custom itemRenderers in
> > the grid.
> > > > > And I stripped them down as far as they can go and it's not
> > because I
> > > > > wrote bad code. Overall, the speed is good for an "internet
> > > > > application". Internet apps get to make excuses. But I'd like
> > to get
> > > > > the speed good enough to rival native desktop apps. Sure, not
> > on
> > > > > everything - but at least on GUI graphics.
> > > > >
> > > > > Keep up the good work. I haven't had this much fun with a new
> > language
> > > > > in a while...
> > > > >
> > > > > On 7/20/06, David Mendels < dmendels@
> > > >
> > > > > <mailto:dmendels@ > wrote:
> > > > >
> > > > >
> > > > >
> > > > > Hello,
> > > > >
> > > > >
> > > > >
> > > > > It has been less than a month since we shipped Flex, but I
> > know many
> > > > > folks on this list had projects they started back in the
> > public beta
> > > > > time. I know in many cases you may not be able to talk about
> > what
> > > > > projects you are working on, but for those who can I'd love to
> > get a
> > > > > view onto what folks are building. We spent a long time
> > (almost two
> > > > > years) on all the parts of the Flex 2 product line (and the
> > Flash Player
> > > > > 9) and it is very cool to see the traffic here, the emergence
> > of third
> > > > > party conferences like www.flexseminar.com , the books coming
> > out on
> > > > > Flex, the 60K plus downloads of the IDE in the public beta,
> > but we'd
> > > > > love to get a sense of what real applications people are
> > starting to
> > > > > build. The team is already working on plans for mid-term and
> > longer
> > > > > term upgrades to Flex, and it helps us to really understand
> > what people
> > > > > are building. So, if you are able to talk about what you are
> > building
> > > > > please do share--I think it would be very interesting for the
> > community
> > > > > and very valuable for us on the Flex team at Adobe.
> > > > >
> > > > >
> > > > >
> > > > > --David
> > > > >
> > > > > Adobe
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Jason
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Jason
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Jason
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > --
> > > Jason
> > >
> >
> >
> >
> >
> >
> >
> > --
> > Flexcoders Mailing List
> > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
> > Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Jason
>
--
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