DataGrid sort efficiency questions
Hi,
I guess I have two specific questions:
1. Is sorting a DataGrid faster/slower/same by applying a
sortCompareFunction to a specific column vs. applying a Sort object
directly to the underlying dataprovider?
2. It says in the following link that if you use a
labelFunction on a column, you must also use a sortCompareFunction:
dataGridColumn.sortCompareFunction
ASDOC
Is this really true - anyone know why?
Thanks!
-Noah
Alexander,
In Flex 3 sorting is controlled by the collections rather than the controls. This provides greater flexibility overall despite making it hard to adjust to. To get or set a sort on the DataGrid in Flex 3, use the sort property of its dataProvider:
ListCollectionView(dataGrid.dataProvider).sort
You can both read and write to the sort property. When you write to it, you have to call refresh() after for it to apply. Refer to the documentation on the ListCollectionView class for how to properly get and set its sort property.
Thanks,
Philip
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Efficiency Question - Cutting Clips
Efficiency Question - Cutting Clips.
So I was wondering if there is a better way to cut my clips that I am not using. Basically I often have large long clips of raw footage that I cut down to the usable segments. Each raw file may be over an hour long and have 100s of small segments of live commentary, often I find I am cutting out slightly to long pauses in the talking and other stuff before I have a clip ready to send to the main edit.
Anyway, often I am zoomed will in so I can edit, and I press C, make a cut.. then make another a bit further up, press V, click on the segment I just cut out.. press delete and then click on and move the rest of the raw clip to the left to bump up where I made the first cut, often needing to zoom well out and then back in again to continue editing.
Is there a better way to do this? So I do not need to zoom in and out all the time... is there a way to delete a chunk of video form the sequence and have the clip automatically "close the gap" for me?
--ThanksI would take the Source Clip into the Source Monitor.
Mark an In Point ("I") where the good content starts...and an Out Point ("O") where the good content stops.
Hit "," to Insert it to the Sequence.
Back to Source Monitor and repeat for the next section of good content in the same Source Clip..
No gaps . Done
Then ..if necessary...I would play thru the Sequence and do Trim Edits at the editpoints.
Many different ways to "skin the cat" at Trim stage.
Alternatively in the first part:
I would take the Source Clip into the Source Monitor.
Mark an In Point ("I") where the good content starts...and an Out Point ("O") where the good content stops.
CTRL-Drag to the Program Monitor. -
DataGrid sort start/completion: specific associated events?
Hi all,
A lot of my DataGrid sorts take a non-trivial amount of time.
So, I'd like to show a busy cursor while the operation runs. In
order to do this I'd need events associated with the start and
completion of the operation. Are there such events available?
Thanks!
-NoahThis thread was "imported" from the old forums -- most, if not all, code seems to have disappeared. But here are the sort functions I posted:
function sortXML(source:XML, elementName:Object, fieldName:Object,
options:Object = null):XML
// list of elements we're going to sort
var list:XMLList=source.elements("*").(name()==elementName);
// list of elements not included in the sort -
// we place these back into the source node at the end
var excludeList:XMLList=source.elements("*").(name()!=elementName);
list= sortXMLList(list,fieldName,options);
list += excludeList;
source.setChildren(list);
return source;
function sortXMLList(list:XMLList, fieldName:Object, options:Object =
null):XMLList
var arr:Array = new Array();
var ch:XML;
for each(ch in list)
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var resultArr:Array = fieldName==null ?
options==null ? arr.sort() :arr.sort(options)
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Datagrid sorting issues with 1/0 items to consider
Hi all,
I have an issue I can't find a way to fix. I am using a datagrid which I pouplate through a XMListCollection based on some XML datas.
XML:
var prefs:XML = <files>
<file name="@toto" favourite="1"/>
<file name="@toto"favourite="0"/>
</files>;
XMLListCollection
var xlc:XMLListCollection = new XMLListCollection( new XMLList ( prefs.file) );
MXML
<mx:DataGrid id="filesList" width="100%" height="100%" dataProvider="{xlc}">
<mx:columns>
<mx:DataGridColumn width="25" dataField="@favourite"sortCompareFunction="favourite_sortCompareFunc"/>
</mx:columns>
</mx:DataGrid>
Sorting fucnction:
private function favourite_sortCompareFunc(itemA:Object, itemB:Object):int {
var value1:Number = Number( itemA.@favourite );
var value2:Number = Number( itemB.@favourite );
if(value1 < value2){
var n:Number = -1;
return n;
else if(value1 > value2){
return 1;
else{
return 0;
return 1;
Once loaded, the datagrid appears in a "normal state":
But if I try to sort first column, it becomes messy
I think it might be related to the fact that the data to be sorted is only made of 0 & 1. But I can't imagine this kind of situations is not fixable.
Any hint ?
Thanks in advance for any advice,
LoicHi guys,
First of all, all my apologizes for my silence. I had technical issues with Yahoo mail that made me miss 3 months mail ! So I just missed your posts and I can only come today to thank you all for your care and answers.
In the meanwhile, I finally got it working by doing…nothing. Let me explain. The issue was caused by equal datas ( 1 or 0 ). So Flex couldn't sort 1 and 1 or 0 and 0 by itself. But these 0 and 1 were flags for an itemrenderer made of a button in toggle mode. 1 standed for on, 0 for off.
Doing so I did override updateDisplayList and then the issue went away. But if I had to stick with pure datas ( 1 or 0 ) I think I would have had to do a custom sort function to deal with equal datas like a few of you offered.
@DonMitchinson the @ stands for the xml attribute as the datagrid is populated with XMLListCollection from an XML file.
Thanks for your sharing,
Best,
Loic -
Noobish "efficiency" question on DataOutputStream
So, I currently have this:
byte[] buf = some_bytes;
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
out.writeInt(buf.length);
out.write(buf);I've always thought that calling write(byte[]) and any given OutputStream will be "efficient", in that things will be chunked under the hood to avoid incurring whatever I/O overhead is present for each and every byte. So, as I understand it, we only need to explicitly use BufferedOutputStream if we're writing one or a few bytes at a time.
Now I'm not so sure.
Digging through the core API source code a bit, it seems that this ultimately calls OutputStream.write(byte) in a loop, which, presumably, is bad unless the OutputStream in question is a Buffered one.
Am I shooting myself in the foot here? Should I be wrapping that DataOuputStream around a BufferedOutputStream? Or vice versa?
Or should I just scrap the DataOuputStream altogether and write the int's bytes out myself?
I'm going to test it both ways, but in the meantime, and just in case the tests are not definitive, I'm wondering if anybody here can tell me what I should expect to see.
I think I've been staring at this stuff for a bit too long and am second-guessing myself to death here no matter which way I look at it. So thanks in advance for any nudge you can give me back toward sanity.
Edited by: jverd on Feb 16, 2012 3:59 PMEJP wrote:
So, what's the point of the basic OutputStream not being buffered then?I guess the idea was that if you want buffering you say so,Ok.
I think you'll find that every significant class that extends OutputStream (specifically FileOutputStream and SocketOutputStream) overrides write(byte[], int, int) to do an atomic write to the OS, so it isn't really such an issue except in the case of DataOutputStream (and not ObjectOutputStream, see above).Okay, so, in this case, I've got a DataOutputStream wrapped around a SocketOutputStream. It's not an issue for SOS, but it is for the wrapping DOS. Yes?
So to overcome the DOS doing a bunch of piddly 1-byte writes to the SOS, which in turn could result in a bunch of piddly 1-byte writes to the network, which I don't want, I inject a BOS between them. Yes?
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Hash Table efficiency question
Hi experts,
In my program, I want to read in a lot of string and store the occurance of each string. I found that hash table is the best and most efficient option, but the problem is that, hash table only store one item.
So, I either have to:
1) store an array object into each hash table entries. ie String[String][Occurance]
2) create two hash table based on the hash code of the string.
For 2) I am planning to store all distinct String into one hashtable using the string as the hashcode, then create another hashtable to store the occurance using the String as the hashcode.
My question is that:
1)which implementation is more efficient? Constantly creating String array for each entry or create two hashtables?
2) Is the second implementation possible? Would the hashcode be mapped to different cell in the hashtable even the two hashtable are using the same hashcode and the same size?
Thank you very much for your help.
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If you really wanna store another reference for that string, create a simple object
public final class WordCount {
* The Word being counted.
* @since 1.1
private String _word;
* Count for the Number of Words.
* @since 1.1
private int _count;
* Creates a new instance of the Word Count Object.
* @param word The Word being counted.
* @since 1.1
public WordCount(final String word) {
super();
_word = word;
_count = 0;
* Call this method to increment the Count for the Word.
* @since 1.1
public void increment() {
_count++;
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* @return Word being counted.
* @since 1.1
public String getWord() {
return _word;
* Return the Count for the Word.
* @return Non-negative count for the Word.
* @since 1.1
public int getCount() {
return _count;
}Then your method can be as follows
* Counts the Number of Occurrences of Words within the String
* @param someString The String to be counted for
* @param pattern Pattern to be used to split the String
* @since 1.1
public static final WordCount[] countWords(final String someString, final String pattern) {
StringTokenizer st = new StringTokenizer(someString, pattern);
HashMap wordCountMap = new HashMap();
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String token = st.nextToken();
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count.increment();
wordCountMap.put(token, count);
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return (WordCount[]) values.toArray(new WordCount[values.size()]);
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Regards
Jega -
Efficiency Question: Simple Java DC vs Used WD Component
Hello guys,
The scenario is - I want to call a function that returns a FileInputStream object so I can process it on my WD view. I can think of two approaches - one is to simply write a simple Java DC that does so and just use it as a used DC so I can call the functionality from there. Or create another WD DC that exposes the value (as binary) via component interface.
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>Or create another WD DC that exposes the value (as binary) via component interface
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If your API does not require WebDynpro Runtime API invocations or anything else related to WebDynpro then your choice is simple Java API.
>But I'm just curious on what would be the Pro-side (if there's any) if I use the WD Component interface approach? Is there a plus for the efficiency?
No. Performance will be better in simple Java API then in WebDynpro component interface. The reason is the API will not pass thought heavy WebDynpro engine.
BR, Siarhei -
Moving Multiple Albums & Album Sort Order Questions
Hopefully this is a really easy question to answer, but I just can't figure out how to do this.
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2. Can you specify the sort order or manual set the
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Hi all,
We are running one query from Sql Query Analyser ,
for selecting values and displaying it in ascending order.
We are executing the same query from coding to load in to
datagrid , but its not arranging it by ascending order instead
its sorting randomly.
Because of this, if i select particular row from Datagrid, its not fetching
the selected row from the grid instead its taking corresponding row number's
value.
Thanks
VaithyHI vaitheeswaran l... ,
yeah what u said is correct grid takes in that manner when u are using collapse levels.try without using collapse levels.if u want using collapse levels it wont come
Edited by: micheal willis on Oct 9, 2009 11:34 AM -
Question being asked multiple times but need to sort the questions into the report
question needs to be placed 150 times on the form, but needs to be sorted as if it were one question on the report
Hello seaturtles24
Check out the article below for repeated requests for authorizations in iTunes.
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
http://support.apple.com/kb/ts1389
Regards,
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Hello,
I have a problem when it comes to sorting a datagrid with multiple fields. I have two fields A and B . B has numerical values . How can i sort B yet also change the data in A since they are dependent from each other?
This is my datagrid
<s:DataGrid id="rankinggrid" includeIn="Ranking" x="156" y="84" width="528" height="229"
dataProvider="{gridrank}" requestedRowCount="4">
<s:columns>
<s:ArrayList>
<s:GridColumn dataField="sequrank" headerText="Sequence" sortDescending="true"></s:GridColumn>
<s:GridColumn dataField="coeff" headerText="Coeffiecent"></s:GridColumn>
</s:ArrayList>
</s:columns>
</s:DataGrid>
Basically i want to sort coeff in desending order but i want to data in seqrank to move accordingly.
Thanks for your help
P.s i am managing to populate the datagrid so all i need is to sort it thanksThanks for your help again
I have reduced the code since the original code is very lengthy and hence impossible to post , yet this should work.
Here i am sorting the grid array according to cost. The problem is that it doesnt work it out in a descending manner(the command you told me doesnt work it gives me an error ) i have used sort and it sorts it in an ascending way and does not give me an error
I would like to solve in a descending way Hope you can help thanks for your time i really appreciate
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="init()"
width="800" height="600">
<fx:Declarations>
<s:ArrayCollection id="ProcessAdder">
<fx:Object ProcessName ="Milling" Cost ="240" Service_Rate="14" />
<fx:Object ProcessName ="Lathe" Cost ="975" Service_Rate="9" />
<fx:Object ProcessName ="Boring" Cost ="800" Service_Rate="8" />
<fx:Object ProcessName ="Drilling" Cost ="270" Service_Rate="20" />
</s:ArrayCollection>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.collections.*;
import mx.collections.ArrayCollection;
import mx.collections.Sort;
import mx.collections.SortField;
public function init(){
var mySort:Sort = new Sort();
// Set the sort field; sort on the last name first, first name second.
var sortfieldRank:SortField = new SortField("Cost", Sort); //descendingSort
mySort.fields = [sortfieldRank];
// Apply the sort to the collection.
//gridrank.sort = mySort;
ProcessAdder.sort = mySort;
ProcessAdder.refresh();
]]>
</fx:Script>
<mx:Legend dataProvider="{ProcessAdder}"/>
<mx:DataGrid id="ProssGrid" x="22" y="334" width="715" dataProvider="{ProcessAdder}"
>
<mx:columns>
<mx:DataGridColumn dataField="ProcessName" headerText="Process Name"/>
<mx:DataGridColumn dataField="Cost" headerText="Cost"/>
<mx:DataGridColumn dataField="Service_Rate" headerText="Service Rate"/>
</mx:columns>
</mx:DataGrid>
</s:WindowedApplication> -
DataGrid Sort Clears HeaderRenderer Checkbox
I have a datagrid that I defined a checkbox as the
headerrenderer for one of the columns. It took me a while to track
this down, but it seems like a re-sort on one of the columns (other
than the checkbox headerrenderer column) clears the state of the
checkbox and resets it to chexkbox.selected=false.
Is there any way to persist the checkbox selected property of
a headerrenderer checkbox instance on re-sort.
I played with disabling the default sort methods and creating
my own sort functionality by only allowing a specific column to be
sorted. That didn't solve my problem though.
Thanks,
JBI did something similar with my DataGrid. The way I solved
the problem was to make a global variable to hold the checkBox's
checked value and then on the checkbox's click event ran a global
function to handle the setting of the global var:
<mx:DataGridColumn id="copyColumn" dataField="check"
width="35">
<mx:headerRenderer>
<mx:Component>
<mx:HBox horizontalAlign="center"
verticalAlign="middle">
<mx:CheckBox id="check"
tabIndex="1" labelPlacement="top" selected="
{outerDocument.check_flg}"
click="
outerDocument.checkAll(check.selected)" height="18" />
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</mx:Component>
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note that the above code is contained in a component that
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I think you can get the jist... -
I have two datagrids. After a form is submitted, datagrid 1
is populated. Clicking on any of the rows will submit to another
query and populate datagrid 2.
If I have submitted my form and datagrid 1 is populated, and
I sort the columns, it will sort and kick of the second query.
Instead of sending to the HTTP service directly when clicking
on datagrid 1 header or row, I have it going to a routine. If the
user has not selected a row, and clicks a column, it will sort but
not submit.
However, that only gets me half the way there. If a user
selected a row in datagrid 1, and then sorts, it will still submit
to datagrid 2. Again, I don't see why if I'm clearly clicking on
the column header to sort that it should submit also.
Is there a way to make the column header independent of the
rows?I would not have expected that.
Pass "event" into the itemClick handler.
Use it to determine what was clicked, and do not make your
data service call if it is the header row. Not exactly how to
determine that, you will need to look at the contents of that
event. Maybe rowIndex = -1?
Tracy -
DataGrid Sorting Issue with Hotfix2
I already opened a ticket with Adobe on this, but since this
is a critical issue for us I wanted to post a message to see if
anyone has any idea where the issue in flex sdk lies.
Check tab 2 of the sample app, Sorting a datagrid who's
column only has partial data causes an error, works fine on Hotfix
1 (same test)
Sample App:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="creationComplete()">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.utils.ObjectProxy;
[Bindable]
public var dgData:ArrayCollection = new ArrayCollection();
public function creationComplete():void
var object:ObjectProxy;
object = new ObjectProxy();
object["filled"] = "Filled A";
object["partial"] = "Partial A";
dgData.addItem(object);
object = new ObjectProxy();
object["filled"] = "Filled B";
object["partial"] = "Partial B";
dgData.addItem(object);
object = new ObjectProxy();
object["filled"] = "Filled C";
dgData.addItem(object);
object = new ObjectProxy();
object["filled"] = "Filled D";
dgData.addItem(object);
]]>
</mx:Script>
<mx:XMLList id="treeData">
<node label="Mail Box">
<node label="Inbox">
<node label="Marketing"/>
<node label="Product Management">
<node label="Large node Large Node Large Node Large
Node"/>
</node>
<node label="Personal"/>
</node>
<node label="Outbox">
<node label="Professional"/>
<node label="Personal"/>
</node>
<node label="Spam"/>
<node label="Sent"/>
<node label="Spam2"/>
<node label="Sent2"/>
<node label="Spam3"/>
<node label="Sent3"/>
<node label="Spam4"/>
<node label="Sent4"/>
<node label="Spam5"/>
<node label="Sent5"/>
<node label="Spam6"/>
<node label="Sent6"/>
</node>
</mx:XMLList>
<mx:TabNavigator height="100%" width="1005">
<mx:Canvas label="Tree Issue">
<mx:Text x="284" y="51" fontSize="16" fontWeight="bold"
text="Issue: Expand the tree node to open up Product Management
node, no Horizontal Scroll bar appears." width="390"/>
<mx:Canvas verticalScrollPolicy="auto"
horizontalScrollPolicy="auto">
<mx:Tree x="50" y="50" width="226" height="303"
dataProvider="{treeData}" labelField="@label"
verticalScrollPolicy="auto" horizontalScrollPolicy="auto"/>
</mx:Canvas>
</mx:Canvas>
<mx:Canvas label="DataGrid Issue">
<mx:DataGrid id="dgTest" dataProvider="{dgData}"
width="500" height="300" x="10" y="10">
<mx:columns>
<mx:DataGridColumn headerText="Filled Row"
dataField="filled"/>
<mx:DataGridColumn headerText="Partially Filled Row"
dataField="partial"/>
</mx:columns>
</mx:DataGrid>
<mx:Text x="10" y="318" fontSize="16" fontWeight="bold"
text="Issue: Toggle the sort in the column that has only partial
data. You will get a find criteria error. This worked in Hotfix 2
and was broke in Hotfix 2." width="390"/>
</mx:Canvas>
</mx:TabNavigator>
</mx:Application>Hi,
With new hotfixes some bugs ( most of bugs) in Flex SDK are
get fixed, but rarely new (sometimes critical) bugs can appear.
Before Flex 3 release which will allow on IDE level to switch
between different versions of Flex SDK on the fly, I would advice
you to store locallly copy of all versions of Flex 2 SDK released
to the public. Then, in case if you will encounter a serious bug in
the most recent release of Flex 2 SDK, you can fix it by yourlself
by reusing the old code from former release of Flex 2 SDK.
See what I did with found bug in Flex 2.0.1 release, which is
what not present in Flex 2.0 SDK release:
jabbypanda.com/blog/?p=25 -
Figuring out datagrid sort programmatically
OK I've got a datagrid with 4 columns. I'm giving the end
user the opportunity to sort on any of these columns. They also
have a report that is generated based on the data in the grid, but
I'm wondering how determine on which column the grid is sorted, and
which (ascending / descending) order so that I can sort the report
in that exact same manner.
I've added some code on the headerRelease event to track this
information (storing it in the Cairngorm ModelLocator), but if you
trace the results it doesn't foot to what you're actually doing,
for example the following writes inconsistent (to the apparent
action being taken in the interface) info to the console. I can
always get the correct dataField property, but its sortDescending
property is almost always opposite of what the datagrid displays:
private function
handleHeaderRelease(dgEvent:DataGridEvent):void
for(var k:int=0;k<myGrid.columns.length;k++)
trace(myGrid.columns[k].dataField + ":" +
myGrid.columns[k].sortDescending);
trace("");
Does anyone know of a better way to figure out on which
column the grid is currently sorted, and what sort nature is
currently applied?
TIA,
JoeOK I figured this out after remembering that the dataprovider
of the datagrid is just an ArrayCollection - here's the answer for
anyone who's looking for the same thing.
In the function that calls the report:
var s:Sort;
var sF:SortField;
s = summaryGrid.dataProvider.sort;
// if sort is null, they haven't clicked any column headers,
so use the default
if(s == null)
urlVariables.sortOrder = "dtAdded";
urlVariables.sortNature = "DESC";
otherwise use the first sort field
(this could be modified to build an appropriate order by
statement for multiple
sort fields if necessary)
else
sF = s.fields[0];
urlVariables.sortOrder = sF.name;
urlVariables.sortNature = sF.descending?"DESC":"ASC";
Hope this helps someone!
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