Flex :: Spark ItemRenderer Labels Disappear When Large Redraws Occur?
Apr 14, 2011
I have an application with a Google Map, an Area Chart, and an accordion containing a list.When the selection in the list is changed, the application fetches data from the server and updates the chart and map, repositioning the map to contain all markers within its viewport and kicking off a SeriesEffect to animate the chart data redraw.When a user changes selections and continues to mouse over the items in the list while the map and chart are redrawing, the labels on the item renderers disappear.The item renderer code is the following:
<s:ItemRenderer xmlns:fx = "http://ns.adobe.com/mxml/2009"
xmlns:s = "library://ns.adobe.com/flex/spark"
xmlns:mx = "library://ns.adobe.com/flex/mx"
[code]....
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Jul 1, 2011
I have a renderer that looks like this:
[Code]...
Loading thumbnails using this method works perfectly. The issue happens when you scroll the List.
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Mar 1, 2011
i have a spark list component and a corresponding custom itemrenderer:
list component:
<s:List id="albumImagesList" itemRenderer="the.namespace.for.XYZImageRenderer" useVirtualLayout="false" width="400" height="160">
<s:layout>
<s:TileLayout requestedColumnCount="5"
[Code].....
it's all fine and dandy, the data gets populated correctly and i verified that the data.image_path property arrives safe and sound inside the itemrenderer.
my only problem is: the image is not displaying. i am not sure if it doesn't render at all or if it's just not visible somehow.
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Aug 26, 2010
I have 2 spark labels next to each other. They are in a basic layout and both have bottom set to 0. They have different font sizes (28 and 12).
Both fields only display numbers. I want the baseline of the numbers to line up.
At the moment they do not as there are no descenders and the descender area of the line is obviously a different height for the 2 different font sizes.
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Oct 26, 2010
In Flex I can create an ItemRenderer to represent each item in the Lists DataProvider but how do I access the instance of the ItemRenderer via the DataProviders Object? Something like myList.getItemRenderer(dp.getItemAt(10));
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Nov 14, 2010
have been working on an air app for quite some time and in one of my mx:lists i have a custom renderer written in pure AS (no mxml). it extends the listitemrenderer mx componenet. in it i have overrode the createChildren() function to add some children of my own.
now, fort right-to-left text i want in this itemrenderer, i would like to add a spark:TextArea component in this createChildren() function
is there a way to do so?
this is the itemRenderer:
import flash.text.TextField;
import mx.controls.listClasses.ListItemRenderer;
[Code].....
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Apr 25, 2011
I need to create a slideshow using data received from another view.I'm calling the slideshow's view like this:
<s:List id = "list" dataProvider = "{actions}"
change = "navigator.pushView (DetailsProduct, list.selectedItem) ">
<s:itemRenderer>
[code].....
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Sep 19, 2011
I'm trying to make a horizontal list of labels with a space in-between them (for use as part of a ticker tape).Labels outside of a list have a transparent background but as part of either the ItemRenderer or List, they get a white background. My assumption is that this is part of the default styling applied to a Spark ItemRenderer.Question - Is there any way to totally get rid of all default visual stylings applied to an ItemRenderer?
protected var messages:ArrayCollection = new ArrayCollection( new Array("1", "2", "3", "etc") );
<s:List dataProvider="{messages}" itemRenderer="SimpleTextRenderer">
<s:layout >[code].....
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Dec 29, 2010
I am using a spark list control with an itemrenderer. Whenever I set an itemrenderer's currentState, the moment I mouse out of the itemrenderer, it gets reset to its default state. How can I make an itemrenderer keep its currentState unless I explicitly tell it to change?
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Jan 17, 2011
I'm writing a s:ItemRenderer to render some simple graphical components in my app. Each element can have multiple shapes that can be selected by the user, i.e. a certain element can be a square, or a circle, or a star, or whatever else.The simplest way I could think for doing this was to include all possible shapes in a s:Group and then manage their visible tag depending on what shape the user has selected. Is there a better way to do that? Also, if I encapsulate the group in a separate MXML component, how do I propagate the state of the itemRenderer (say "hovered") down to the MXML component that manages the shapes?Let's say you want to display three types of objects alternatively - the IR below with an AS snippet that turns visible to false for 2 out of the 3 objects definitely does the trick, but seems so ugly to me. In the mean time I found setCurrentState (stateName: String, playTransition:Boolean=true) to propagate the state down, so that's solved.[code]
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Feb 9, 2011
I am having an issue with my ItemRenderer, which I am using for a spark List. My code is the following:
I have this list:
<s:List
id="productSetList"
dataProvider="{ model.productSets }"
[Code]....
The thing is, if I scroll the list, and click on an item, it does not trace 'arthur' ! Why is this so ? I must trace that all the time that someone clicks in the list!
EDIT: If I remove change="model.selectSet( productSetList )" in the list, it works!! but I cannot remove that, some suggestions ? How can I switch that to another function?
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May 4, 2011
Objective:I would like to pass Skins to an itemRenderer (which is a Button) of a List, and be able to skin every button in that List.This is what I have:
List:
<s:List itemRenderer="renderers.ItemRenderer" dataProvider="{collectionWorkspace}" />
ArrayCollection:
<s:ArrayCollection id="collectionWorkspace">
<comp:Layout1 />[code]...
I get an error (fixed for clarification):Error: Skin for Application....Button1 cannot be found.
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Mar 22, 2011
I've made a custom list itemRenderer with 2 buttons and a label. One button deletes the list entry (and thats not the problem) the second button would change the actual view.how I can change actual view within the itemrenderer ?
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Apr 26, 2011
I would like my spark ItemRenderer to be able to render a varying number of graphical objects that depends on the user input. As an example, let's say that I want to render a set of ellipses on a line.I've been using MXML for my most recent batch of ItemRenderers and have loved every minute of it, but I'm not sure how to accomplish the above goal with an MXML IR. In Actionscript I can acquire the list of ellipses locations and draw them programmatically in the updateDisplayList method. Is there an equivalent in MXML?
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Feb 27, 2012
I've got a DataGrid in my mobile application (I know, I know but there's currently not other solution for this), that numeric values. Depending on the value of a cell, the text gets colored. My big issue is that this doesn't work very for more than about 5 rows of data. I reckon the issue is that the set text function (in which I format the color) can't keep up with the amount of cell changes and formats the text based on the last updated cell of the row.I thought about a column item renderer so that the renderer only gets the value for that column, and not the whole data of the row.
Just for reference, this is my current item renderer (again, this works fine for few rows, for 5+ of fast changing data, this doesn't work any more, cells get formatted even though their data hasn't changed).[code]I just double-checked and have to revert my previous statement. A single row works fine, the second row already messes up the color formatting though. It seems as if the datagrid somehow throws together the values.
Doing the color formatting in the set data method shows the exact same effect;[code]My assumption about the grid messing up the ItemRenderer's data seems to be correct.A simple trace in the set data method (trace("old: " + _oldVal + "new : " + value[column.dataField]);) revealed that somehow, values of the next grid row (in case there are 2) get used as well as _oldVal gets the old value of the next row.
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Sep 1, 2011
I have a main application that contains a list, using a custom itemRenderer to display data.
I would like to be able to call a function, inside the itemRenderer, from the main application.
When running the app, we have a list with three persons, and a button. I want to call the function myItemRendererFunction() inside the itemRenderer, of the selected item in the list, all this, from the main app.
[Code]...
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May 3, 2011
I am trying to create a generic List, where I can pass the layout & item renderer as parameters.Since it is not possible to pass parameters to a MXML component's Constructor, I figured I should create my List in Actionscript.
[Code]...
I would prefer to have the List in MXML (because It will be easier using states later), but If I am forced to use pure Actionscript so I can instantiate it and pass in parameters, any help would go a long way.
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Jan 16, 2012
I am trying to use the same custom renderer for all the columns in a spark DataGrid. I need to know the dataField or columnIndex based on which I can change state in my custom itemrenderer.
Earlier in mx:DataGrid, this can be achieved by extending the MXDataGridItemRenderer which implements IDropInListItemRenderer and hence dataGridListData property is available.
But using the spark DataGrid, I am extending the GridItemRenderer which DOES NOT implement the IDropInListItemRenderer and hence unable to access dataGridListData property. I have tried to write an action script class extending GridItemRenderer and implementing dataGridListData but flex throws an error in the set function of this variable.
// Sample itemRenderer used for mx:DataGrid [Working Code]
<fx:Script>
<![CDATA[
import mx.events.FlexEvent;
[Code]....
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Jun 29, 2011
In a flex project that I have that is designed to scale 100% to the web window, I have a spark list. And I have a simple itemrenderer that takes the data and displays a name, and a message. Just think of it like a simple instant messenger display. The problem is that for my msg_txt label I want to give it a width thats the width of the parent list thats holding it.I tried turning the horizontalScrollPolicy to off, also tried width="this.parent.parent.width}" (as well as this.parent.width) for the spark label inside the item renderer. and in the label i tried some things like left="0" right="0" maxWidth="{this.width}" but nothing really does the trick.How can I make this label have a max width of the list thats holding it, AND make sure it resizes if the size of the browser changes and the list size changes?heres the list:
<s:List id="chat_content" width="100%" height="100%"
alternatingItemColors="[#EEEEEE,#E6E6E6]" contentBackgroundColor="#EEEEEE"
horizontalScrollPolicy="off" itemRenderer="renderers.ActiveChatItemRenderer">
[code].....
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Feb 7, 2011
I'm looking to add a couple of buttons to the title bar of a Spark Panel or Spark TitleWindow. Is this possible to do without making the panel from scratch?
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Sep 3, 2009
The jist of what I'd like to know and focus on understanding, is details on how binary deserialization occurs in Flex 3. When is the constructor called, when are properties set, are private members serialized or does all deserialization occur on and through setters, etc? I'm having a hard time finding information on this.In a Flex 3 AIR application, I have a pretty complex object graph(just a bunch of objects referencing one another, kinda like a big data model except a bit more complex) that I serialize to a file using a single call on the FileStream.writeObject and readObject on a root object, which serializes and deserializes the entire object graph.I found that I needed to always have a default constructor, else I would get exceptions on the objects when deserializing if they were part of an ArrayCollection. So I had to eleminate the constructor parameters or set default values. I now have many setters like this in my classes, such as the below where mConnection accumulates some information it needs through different setters, where as before I had this all packed into the constructor since all of the information is really necesary for the Connection to function:[code]So the connection's serverIP is still an empty string because the server was assigned to the client's property before the server was completely initialized.
I could probably resolve this by using binding so that updates to the serverip in the server are bound to the connection, but I find binding properties to be fairly complicated (it's really simple on UI in mxml cause you just use the curly bracket syntax but doing it by code is what I found complicated). I have also resolved some cases by removing the constructor parameters entirely, so that there is no default values. All that aside, I still really need a deeper understanding of the details of binary serialization as far as how it rebuilds the object graph. I even have circular references, and it seems to handle those fine and maintain multiple references without duplicating objects. It's just when my constructors/setters are more complex that I'm running into these problems because of the order of what occurs during deserialization. It is really inconsistent though, as adding breakpoints in various places seems to influence the order that things occur, making it more difficult to debug.On a side note for anyone that might sidetrack the topic because I am serializing a class called Connection. I added some code to address some things, like in the Connection class there is an instance of a Socket. Of course my socket would not be connected after I close and reopen the application and deserialize it, so before I serialize my object graph, I go through and close the socket and set the reference in the Connection class to null, so that there is no longer a reference to the socket and thus it will not get serialized. After deserialization on the next application run I create a new socket.
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Feb 4, 2011
i have a problem using the itemRenderer functionality. When using an ArrayCollection the visible Data in the DataGrid using the itemRenderer will be rendered just fine. But if i start scrolling the entries are repeating in the cells using the renderer. The cells are not filled with date according to the id. What mistake i'm doing here.
I read a lot of the explainations like:
[URL]
here is the code for the set data function (itemRenderer is extending HBox):
override public function set data(value:Object):void {
_data = value;
if(data!=null)
[code]....
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Oct 17, 2010
Anyone know how to change a single instance of an item renderer for a Flex tree item at runtime? To reiterate, I'm not trying to change the entire tree's item renderer like this:tree.itemRenderer = new ClassFactory(ItemRenderer2);I'm trying to change the item renderer of a single tree item like this (the following code does not work):tree.selectedItem.itemRenderer = new ClassFactory(ItemRenderer2);To put it more simply, does anyone know how to reference an instance of an item renderer and set it to a new item renderer class? I've tried using the Tree's itemToItemRenderer() method with no success.
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Feb 26, 2011
I have implemented drag and drop between 2 AdvancedDataGrid, but the default behaviour from Flex displays the row data during the drag using the grid item renderer showing all 5 columns.
Instead, I would like to display an icon / image or my own custom item renderer during the drag and drop.
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Sep 25, 2010
I want to create a list of progress bars and update the list accordingly.I have group data in an Array as
<mx:Array id="arr">
<mx:Object label="Group One" min="0" max="200" currentValue="60" />
<mx:Object label="Group Two" min="0" max="300" currentValue="50" />[code]....
The values in the array object indicate name of group,minimum,maximum and current value for the group (to be used in progressbar).I used the list with "mx.controls.ProgressBar" as itemRenderer as
<mx:List width="100%" dataProvider="{arr}"
itemRenderer="mx.controls.ProgressBar"/>
Now what I need is whenever currentValue field of Array "arr" changes i want to update the progressbar "progress" value to currentValue (where min and maximum value of progressbar are stored in Array "arr").
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Jun 25, 2011
im completely lost on how to do a simple multiline label. The docs say that labels are best used as single lined elements, but that alludes to it being able to do multiline if necessary. Anyone have any clarification on the subject?
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May 11, 2011
How can we navigate within an itemRenderer? For example, in Views we use the View.navigator (ViewNavigator) to push and pop views, there is no such feature in ItemRenderer.
Navigation within a View (Easy)
<s:View>
<s:HGroup >
<s:Button label="Questionnaire" click="navigator.pushView(view.QuestionnaireCategory1View)"/>
</s:HGroup>
Navigation within a Item Renderer (Impossible?)
<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
[code]...
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Jun 21, 2011
I have a List which has TextInput as itemRenderers for all its items. Upon application launch the items are rendered in the TextInputs correctly. The data is being populated from an Array of Objects.
What I want is, after the data has been populated in the ItemRenderers, I want to have an additional item renderer (TextInput of course)...so that if the user wants to enter another item, he can put it in the additional textInput.
And I also want to add the additional itemRenderer each time the user has added a new item and taps ENTER on the newly added item.
Below is my itemRenderer, there is the clearTxt_enterHandler handler..but I wonder how to add another itemRenderer upon "Enter".
<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
[Code].....
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Apr 18, 2010
Can I set label visibility in Flex ?
[Code]...
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Oct 25, 2010
I am working on an Adobe AIR (2.0) application that contains a feature to allow users to print documents (such as salary slips). Those documents are originally in PDF format. Due to circumstances we cannot directly display those PDFs in the AIR application (for example using flash.html.HTMLLoader). Therefore we convert the PDFs to SWFs (using the pdf2swf tool, see The SWFs are loaded into the application using a mx.controls.SWFLoader, like so:
<mx:SWFLoader
id="salarySlipImage"
loaderContext="{someLoaderContext}"
[code].....
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