Flex :: What Was Design Decision Behind ItemPendingError
Jul 29, 2009
Flex has the notion of lazily loading data. It has a class named ItemPendingError which allows developers to handle it when an attempt is made to access data that is not yet available aka "pending".However, looking at the documentation it's clear you have to add try/catch blocks around your code wherever you have code that might cause an IPE (ItemPendingError) to occur.I'm curious if anyone knows why it works this way. I'm not sure what the best solution might be, but having to willy-nilly add in try/catch blocks to catch the error and then register a Responder with it feels bad and not very clean. And the fact that you sort of have to exercise your application to make sure you've caught all the possible places where the error might occur is also lame.Is there some other way or better approach that I haven't seen/heard of?
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Aug 14, 2009
I've just recently learned the PureMVC framework, and am a little confused as to the coupling between Proxy and Mediator objects. The links on this page connect to some documents describing the framework. (Please note, the links on the aforementioned page open PDFs.)
The diagrams and examples of PureMVC I've examined often show a direct coupling between a Mediator and Proxy. When the proxy's state is updated, rather than sending a new Notification, the Mediator (which retrieves a reference to the Proxy from the Facade) has its state updated.
This certainly seems to simplify the logic of the code, but it also directly couples two seemingly disparate components together. To my understanding, a Mediator's purpose is to translate Events from a view into PureMVC Notifications. Proxies are meant to perform some function to gather data and relay it back to the view. These two components seem to exist in different layers of the application, and perhaps shouldn't necessarily be coupled together.
Wouldn't it make more sense to have the Proxy objects send their own Notifications when their state updates, which are forwarded to the interested Mediator by the Facade?
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Jun 2, 2010
I'm going to write an application with the Air/Flex-Framework. I'm looking for Best Practise and general Design Patterns for designing software especially in Air/Flex. I have experience with this framework but never had the pleasure to write a piece of software from scratch.
For instance: I stumbled across lots of software written in Air/Flex with nearly infinity global vars Most of the software I saw was not object-oriented How can I pack the asynchronous method calls nicely?
I'm familiar with general design patterns by gamma. I'm looking more for advise in designing good quality software with Adobe Air/Flex.
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May 16, 2010
I have only worked on web apps for my whole career.I'm starting a new desktop (Adobe AIR) app project but I found myself having difficulties with:
stuck with thinking about overall UI design in the traditional page model
not sure how to handle the navigation part in the UI
not taking advantage of states
deciding what should be implemented on client vs server side, (or on both?).
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Aug 27, 2010
I now need to design a chemistry periodic table. I will have a set of few elements that have been chosen by the user,and that should be reflected on the periodic table by making these few elements clickable.So when the user clicks on these few elements,corresponding explanation text will pop up on the text area outside the periodic table.Making all the elements of the periodic table buttons,so only the buttons that are within the set are enabled(clickable),while others are disabled.Embedding a static periodic table picture,and do things there(don't know exactly how yet).
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Jun 11, 2009
i need of simple UsA map in flex ,all Area need to be click able as button Is there any tool available for designing buttons in various shape in flex or any build in free map is available in flex. As vector format so that zoom in will not affect the quality.[URL]..
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Oct 17, 2009
I'm struggling to reproduce the gradient fill of this chart. Is there tools that help testing GradientEntry properties on fills?
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Aug 30, 2010
I'm new to Flex 4 and have been doing the Flex in a Week crash course online.
build a dynamically growing or shrinking table with columns and rows. The cell backgrounds of the table will change color depending on an XML file.[url]...
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Feb 1, 2011
I'm working with an application which was originally designed to make heavy use of static-variables and functions to impose singleton-style access to objects. I've been utilizing Parsley to break apart some of the coupling in this project, and I'd like to start chiseling away at the use of static functions. I will explain the basic architecture first, and then I'll ask my questions. Within this application exists a static utility which sends/receives HTTP requests. When a component wishes to request data via HTTP, it invokes a static function in this class: Utility.fetchUrl(url, parameters, successHandler, errorHandler); This function calls another static function in a tracking component which monitors how long requests take, how many are sent, etc. The invocation looks very similar in the utility class:
[Code]...
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Jun 20, 2011
I am just looking design patterns used in Flex. Any value object design pattern and how is it implemented in Flex.
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Feb 9, 2012
When i try to open my mxml script in design mode i'm always getting following message "This Component is base on VBox, which is not a visual component. Switch to source mode to edit it"
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Jun 22, 2009
I am a newbie to Papervision. I want to design a sphere with 8 holes around one of its diameters. How do I do it? How do I draw anything on a sphere in Papervision?
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Jun 23, 2009
My embedded images show up in the Flex Builder Design Preview, but are not displayed when the application is run. The images have relative paths (/assets/images/...), and the application is run on the server (wamp). I've appended the path to the compiled location [URL] and tried to display a image in the browser, and the image exists, too. I've compiled it via FlashDevelop, Flex Builder, and Ant. I've deleted and remade the bin/bin-debug/release/bin-release files to no avail.
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Dec 29, 2009
How can i change the color, when the user mouse over an item on datagrid or tilelist. Basically once the user mouse overs and once the user selects a file. How to change the default color to something else. The default is blue and i dont like it :)
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Dec 22, 2010
I am looking for some decent tutorial that will explain the correlation between flash and flex (how can I use flex's coding ability with flash's design interface).
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May 11, 2010
I'm looking for a tool to create just the skins for different kinds of Flex 4 components.I'd like to be able to create the components myself and have the designer/artist do the skin, but I don't think they'd like the idea of doing them by writing MXML files.
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Jun 25, 2010
We are currently thinking on getting our apps automaticaly built and tested through a CI server.My major concern is regarding UI tests.. I've been playing with FlexMonkium/Selenium IDE in Firefox but it doesn't really play nice with my app. I'm also testing RIATest 3 but I would have liked the Firefox approach better because it's easy to use for non technical users..A bigger concern is that my app is really complex, using custom events, custom components, ExternalInterface calls.. in order to make it all work smoothly, should I give an automationName to every single component ? How can I handle custom events ? RPC responses time
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Sep 9, 2010
I have a very interesting challenge here for my Flex project development. I now have an experiment wizard which consists of three states.In the first state,the user selects the elements they are interested from the periodic table. When it comes to the second stage,now we have the elements that the user selected in the first state,and these elements are shown on a list A',the user can select an element from there. Also,I have an xml file that has the intensities and wavelengths for all the elements in the periodic table
[Code]...
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Apr 7, 2011
I had experiences using Mate and Parsley. But for now, I'm using none.For instance, I'm using observer and singleton patterns like following.
RegisterView.mxml implements IRegisterAction interface
function onBtnRegisterClick(){
var action:RegisterAction = new RegisterAction();[code].......
This is my interface IRegisterAction.as
function registerCallback(customer:Customer ):void;
My question is "What additional benefits I will get, if I use a particular framework ?".
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Jun 12, 2011
I am new to Flex and trying to modify some existing code.I am trying to It uses and Advanced DataGrid. In the click event, the ListEvent is passed in, and the code is able to access properties such as event.itemRenderer.data.feature.I would like to check whether the user has clicked on a parent (group) record or the child record; at runtime, I can see that the property I want to access is event.itemRenderer.listData.hasChildren. However, the listData property of itemRenderer does not show up in intellisense, and when I try to access that at design time, the project will not build because of the error "Access of possibly undefined property listData". But the property .data.feature doesn't show up in intellisense at design time either, and that builds and runs just fine.
What do I need to do to access event.itemRenderer.listData without throwing errors when I build the project? Do I need to capture a different event, or cast the event object or one of its properties into another object that will have the properties I need at runtime (I've investigated these options but cannot find info on how to do that).
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Apr 1, 2010
Do you know how if you drag an <mx:Label> or <s:Label> component into your Flex project, when you go to design mode you get this panel on the right to set its properties like text etc.
I have a custom component that I can call with actionscript, or with mxml like this:
<comps:TheComp field1="OK" field2="Yes" />
The component takes this input and uses it for its internal operation
[Code]...
When I go to design mode, I can see the component under custom components, I can drag it to the stage and see it, but can't set its values field1 and field visually on the right like a normal <s:Label> or <mx:Label> would have. how I can add that? Do I need to make it inherit something or anything else
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Jun 3, 2011
If I have a component that has some states defined, is there a way to make changes in design mode but not have it tied to a particular state? For example, if I have state1 and state2, any changes in design mode will be based on state1 or state2 (i.e. width.state1). I understand this is the direction Flex is going in but I'm transitioning from a Flex 3 app and right now I just want to make the change to width and not width.state1.
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Jan 13, 2012
In my Flash Builder (Flex) 4.6 app, I just noticed for some reason all my "s:Window" components will not allow me to click and select anything in design mode in flash builder!
My other non-window type components are fine - I can open a TitleWindow or Group for example and click on the various fields and labels no problem.
In my Window components, I can select an item in the 'outline' window, but not using the mouse and actually clicking on the component in the visual design window. When I click in there, it looks like it's selecting the actual 'window' box. Almost like it needs to be 'sent to back' or something.
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Dec 13, 2011
I was editing a very basic mobile Flex project, and after I debugged the master (application) mxml file, Design View stopped working (blank screen displayed, no Design View errors) for all files. Creating new projects, either mobile or else, or testing old, working projects, doesn't work either. Out of the related issues I've found info on, most concern earlier versions of the IDE, and deal with either Design View errors (got none), use of certain functions or custom components (I get the error even on a new project), or are solved by changing styles back-and-forth (tried already, to no avail).
I can't drag and drop components to the design area, either (a "prohibited" symbol appears and nothing happens when I drop); so I'm pretty sure it's not code-related or a bug, but probably something stupid, like a configuration issue, so I definitely need someone to take a fresh look at it.
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Apr 9, 2011
It's my understanding that view states can be useful when switching the layout of design elements. Such as, a loading page as one state and the main application design in another state. Is this the correct use of them? Additionally, I have a label in State1 and I cannot figure out how to access that label via actionscript. labelID.text = "New Text"; is not working.
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Jan 22, 2011
Flash Builder's design view is worse than 3's (which at least was usable if you ignore some quirks), so WHAT do Flex UI designers (those who don't have paid design teams...) do to design a complex UI? Because Design View (also based on what a lot of people say about it..) gets more useless with every release.See image for some differences in design view vs.Flash. WHAT is causing this? css also posted..("Duration", "hr", "min" are mx Labels, the image size text is an mx Text comp.Project is an "mx only" SDK 4.1 project.) I don't even care that the spinners look different, I just need it to show me correctly sized stuff so I can position things via Canvas, or properly size containers.
mx|Label {
font-weight:bold;
font-size:12;[code].....
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Sep 15, 2010
Is it bad practice/design to nest components inside components using Flex 4? Should I simply be creating components and inserting them into my main application as below, or doesn't it matter?
<com:MyComp1>
<com:MyComp2>
<com:MyComp3>
[code]....
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Aug 26, 2011
Don't know if the flash layer on the view stack contain only the compiled flash swf file
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Feb 28, 2011
I've been trying to teach myself flash for a couple of weeks and am totally lost. I have had experience with programming in the past, so I understand logic, etc, but I really am not grasping this forced time based system.What I need to do seems pretty simple. I have a jpg of a washing machine front panel. I need to be able to put some transparent "buttons" over it, and have some areas "light up" when the buttons are pressed. So far I understand that I have to work in a chronological setup, with key frames for each state of interaction, and use buttons with some kind of gotoframe action script. what I can't do:
1. get the background jpg to stick to the stage. it apparently has to be either a symbol or a layer?
2. make transparent buttons. in flash catalyst I can just set the opacity to 0, but I'm not sure how to do this in flash pro.
I guess those are the pressing issues. I had tried to import the jpg as a psd background, but then I had to put the button on a separate layer, and it was always either behind the background, or I had to have it's action refer only to the timeline of it's own layer and not the background.
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Mar 21, 2010
Background: I've been coding in VIM/C++/OpenGL for a long time.I've come to realize that this (VIM/C++/OpenGL) isn't the way to learn about programming fancy/cool-looking/futuristic UIs; and that the design of such UIs belongs more so in the artistic/designer world of Flash.
Anyway, I currently have a machine with MacOSX. What software should I install? What book should I read to learn about the artistic/design side of these futuristic UIs? [It's okay if the tools to design them are mouse clicking + graphical rather than coding based].
Question: what software packages + books to read to learn about creating fancy-looking / futuristic UIs in flash?
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