AS3 :: Flex - Inherited Classes And Dynamic Views In PureMVC
Jul 14, 2009
I was wondering best practices for views of inherited classes in PureMVC in this situation: Multiple classes inherit a BaseClass (lets say InheritedClass1 and InheritedClass2) Each InheritedClass has a respective view (derived from a base view class, but each unique) With a given dataset (lets say ArrayCollection of InheritedClass1/2 Objects), the respective views need to be dynamically loaded. The dataset is relatively large, so a TileList would be nice (since it only instantiates objects which are currently displayed) I can think of a couple solutions, but I find them to be too "hackish" to be the best solution:
In View: Repeater over a BaseClassView which attributes a view to a State (set to the "InheritedClass1" state to add a InheritedClass1 object) Pros: No unneeded memory increase (States' objects are instantiated when needed) Cons: View is dependent on the data types, so adds coupling In Mediator: Loop over the ArrayCollection and addChild() the views based on data type Pros: Works. Cons: Mediator is adding things to the View, which defeats the point of the separation of Mediator and View. Slower than a Repeater.
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Sep 15, 2010
Often multiple instances of the view component would be used in multiple places in an application. Each time I do this, I register the same mediator with a different name. When a notification is dispatched, I attach the name of the mediator to the body of the notification, like so:
[Code]...
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Aug 16, 2011
I'm making an app with flash AS3 and puremvc, the way to correctly handle view mediators is sort of throwing me a little...I have 3 or 4 distinct views, each governed by it's own mediator.Each view is only displayed on its own - ie. when 1 is visible/on stage - the others are invisible/removed from stage (over simplified, but I guess could be thought of as seperate pages, viewed one at a time, a nav bar allows a user to change views when they like)
At first each view mediator I had creating and added to stage it's own view component, and as such, when it was 'turn' to show or hide that view, it was simple - addChild and removeChild for it's view component.However, I read over at puremvc.org that it's not good practice to
a. pass round the stage (which was the viewComponent for each mediator in my case - where each view was added to - eg. viewComponent.addChild(foo)
b. create its own view - which allowed me to add and remove it in the first place.
So I changed to the recommended way - when I create each mediator, what I pass in is the view component it governs (rather than the stage/main doc class eg.
var view:MyView = new MyView();
facade.registerMediator( new MyViewMediator( view ) );
viewComponent.addChild(view);
with that the case - I have no idea how I would go about removing/adding each view when needed.I could easily enough set the visibility from within each mediator, but I sort of wanted to avoid doing that - prefer removing when not in use for resource management...how I am 'meant' to go about this (as in, when a view is no longer needed on stage, remove it - temporarily, and add it later on when it is needed?)
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Oct 6, 2009
I'm used to building applications using pure AS3. I always pass dependencies into the constructor of classes I make, but this method seems to not work out well for Flex MXML views. It seems like I should define setters on the MXML class, which map to attributes in the tag/class instantiation. But using this method I cannot specify which properties are required and in what order I expect them etc. What is the preferred method to give a Flex view it's dependencies?
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Feb 15, 2011
I'm at the verge of starting a (for me) very complicated project and I am confused about in what way I should setup my code.EXPERIENCE:- I've been programming AS2 for almost 7 years now- Finally switched to AS3 a year ago- Have beworking with the PureMVC framework in my last couple projects nowPROJECT DESCRIPTION:I have to make several templates for a dynamic quiz game.+ Information about the quizzes comes from a database+ quizzes can have different kind of question and there are also other types of screens (information, video, etc)+ All quizzes are dynamic and therefor different+ there have to be several different templates (design, animations and dimensions)MY PROBLEM:I don't really know how to tackle the different templates in the right way.I want all the templates to make use of the same basic code, but only look different (design, transitions and dimensions) terefor I think I should use a MVC pattern.But how do I implement it in such a way that I:- can have 3 different templates- add extra features to the source code without needing to update all the templates- easily add other templates when neededI'm a bit stuck in the MVC way if thinking (which is quite complex for me).
- Do I need to create different sf's = SWFs for every template (and thus the need to update them all for every new feature we implement)- Or should I use a core template, on which I can expand a new "skin" by dynamically loading a theme-swf?
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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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Apr 21, 2010
I'm building modular application with 2 modules which share common vo: ShopRegionVO
This vo is also a BlazeDS entity and is mapped to a remote java object. When shell loads first module everything is ok. The second module is a list of ShopRegionVOs and item change is handled with the following code:
sendNotification(CoverageConstants.SET_SELECTED_REGION_COMMAND, ShopRegionVO(List(e.target).selectedItem));
The exception is thrown right here:
Main Thread (Suspended: Error #1034: Type Coercion failed: cannot convert model.vo::ShopRegionVO@14961809 to model.vo.ShopRegionVO.)
view.list::RegionListMediator/onChange
flash.events::EventDispatcher/dispatchEventFunction [no source][code].....
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Oct 12, 2009
I am building a tabbed interface for switching between various similar layers. Each layer will have a number of graphs. By dragging with the mouse the graphs can be rearranged or even moved between layers. My question is, is it best practice to register a unique mediator for each layer that keeps track of the layers content / organization, or should i keep track of it all with one central mediator.some considerations:
the layer contents and organization will be saved(in a db) so that it can be restored when a user comes back to the app.the layers themselves are functionally identical.the user can add and remove layers at will.
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Dec 28, 2009
I have one question about pureMvc. I use pureMvc to build an engine, in the engine init part i have an requirement
1) moduleA must init firt
2) moduleB , moduleC need init after moduleA init complate.
3) moduleD need init after moduleB & moduleC init complate.
4) moduleA , moduleB , moduleC , moduleD all extends Proxy beacuse the four system all need to send notifiation ,but no need to listen it.
But to fit for the requirement I can't use command to do it, because they have ini order and also they need to remember current state(ex: moudelB is init Complate but moudleC is not init complete then can't init moudleD) but command is stateless. The best way I think is use one Mediator to do it, beacuse it can both listen and send notification. My question is :
1) Is this a good way to use one Mediator to do it?
2) If use Mediator is good way, then when it hear first moduleA is init complate
registerCommand(FIRST_MODULE_INIT_COMPLATE , initStepTwoCommand);
sendNotification(FIRST_MODULE_INIT_COMPLATE);
removeCommand(FIRST_MODULE_INIT_COMPLATE);
Need to do things like that way or just do the inti logic in the Mediator?
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Oct 11, 2011
I'm looking for suggestions regarding implementing process flow / work flow management in a PureMVC based application. Our Flex application includes a number of processes such as account creation, payment processing, etc. Within our team, there is some discussion of how rigidly we should adhere to the PureMVC model. Within the PureMVC model, it seems reasonable that the current state in the process could be managed in a Proxy. Commands are clearly responsible for processing the actions required of each node and for node transitions. Mediators for managing the UI.
However, I think that there is an important bit still missing here: a ProcessController. The approaches we've reviewed all seem to either violate the PureMVC model (even just slightly) or make unreadable code. A proxy would maintain the state of the process. As such, it seems to be an appropriate way to implement the controller. However, this is putting a lot of business logic into the proxy.
[Code]...
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Jul 10, 2010
I have a flex application written using PureMVC framework.Now,I want to write tests.We are using FlashBuilder 4.Is FlexUnit sufficient for testing? Are there any issues you have faced while writing tests?
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Mar 30, 2011
Ive read a ton of online tutorials about this and cant seem to get a definite answer...
View1.mxml
navigator.pushView(views.view2, {response:"BLAH"});
View2.mxml
[code].....
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Dec 9, 2009
My company is building a Flex application that we may need to port to other platforms:
[Code]...
Currently, I'm looking into application frameworks to build upon and I'm torn between pureMVC and Swiz. I LOVE swiz for its simplicity and how it just gives you a way to hook things up and then apply your own patterns. From a flex-only perspective, this is my 1st choice. But, PureMVC is platform-independent and has already been ported over to most of the platforms that are mentioned above. How valuable is this portability? Will it really make our lives significantly easier when it comes to porting and developing/maintaining multiple applications? If so, then it seems like PureMVC is the way to go.
Alternatively, since Silverlight has the most definite business case for porting of our application, maybe we could port Swiz to Silverlight? I'm not too familiar with which AS3 language and Flex framework features Swiz depends on and whether they are available in C#/Silvelright.
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Oct 19, 2010
I'm working on an existing modular project that was built in PureMVC. Instead of converting everything over to RobotLegs, I want to create a new module using RobotLegs and plug it into the pureMVC shell. Currently, when the module loads, I get the following flash error: ReferenceError: Error #1065: Variable IMediatorMap is not defined.
Inititally, I thought it was because my module needed a pureMVC Mediator to call the pureMVC StartupCommand to get things "hooked up" and THEN create the RobotLegs' Context. However, that didn't work and I'm still getting the error.
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May 27, 2011
I am trying to write a simple multicore PureMVC helloword. I am getting Error: multitonKey for this Notifier not yet initialized!
[Code]....
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Jun 10, 2010
I'm trying to figure out how to in as3 (not mxml) add views to a view stack.For example I have a view component like so[code]I've being trying to add it to a viewstack in the following way.[code]I'm aware I have to assign ID's but for now I just want to get the view in there
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Jul 1, 2010
I have a Flex application with three different views. Only one view is shown at a time, and the choice of view depends on what part of the application the user is working with. If it had been an ordinary HTML webapp I would have created three different HTML-templates/pages for each view.
What is the recommended way to handle such application views in Flex?
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Sep 13, 2011
I'd like to make an application for PlayBook (using Flex) that has the UI similar to the PlayBook web browser. By similar I mean I want to implement a menu that is shown when the user swipes down from the top bezel of the tablet. I like this feature because I can draw on it, place tons of other objects and handle all kind of events without using screen space when not needed. Plus the PlayBook does not have a "Menu" button like some phones have.Depending on configurations chosen from the first view a number of other views will be pushed onto the the stack view. When the user will access the pull down menu I'd like to show in form of thumbnail snapshot my main (configuration view) and the rest of the views that are on the view stack. This will basically show the user what is going on in different view and let him choose to which one to switch.[code]The menu is accessible from any view, but the code for event handler is in my main MXML file (project.MXML), I found this to be the only way of having one menu for all the views. I managed to pull down the menu from any view and displaying a thumbnail of the current view.
How to get access to all the views. I've been trying all day and all my trials give me access to the active view and my menu object. Here is some code to show what is going on:[code]As I mentioned above this for loop will successfully do the job for the current view then it will crash.Does anyone know how to loop through all the views? This is my first application with flex so if there are any alternatives to my approach I'll be glad to try them. Although I'd like to stick with a single ViewNavigator as opposed to tabbed navigator and multiple views instead of states.
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Feb 22, 2010
I have an ArrayCollection bound to a view, I use a filterFunction on this view to only display parts of the contents. Additionally I have another component where I want to display other parts of the ArrayCollection.
What I would like to do is wrap ArrayCollections around each other, meaning I could have one ArrayCollection containing the model data, and then two separate outer ones where I can set the filterFunction property (setting this in the model seems inappropriate in all cases). Is this possible somehow? If not, how else can this be solved, preferably without forcing model logic to end up in my view?
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Mar 19, 2011
how I would pass a value to "SelectedChild" in ViewStack:
In the example below, I am trying to set a public property in a form called "register" after I have navigated there from another form called "login".
The result I get seems to be a compilation error:
Error: Access of possibly undefined property pagename through a reference
with static type mx.core:INavigatorContent.
vsMain.selectedChild.pagename = "register page";
[Code]....
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Apr 18, 2011
I have a project that has 4 views where I'm using the tabBar with viewStack/NavigatorContent. I have a couple HTTPServices set up gathering the XML and converting to Bindable ArrayCollections. When and how is the best way to pass that data to such things as charts, dataGrids, etc. that aren't seen until the user clicks a tab? Right now I have each item set up with creationComplete functions that pass it then. Although it seems to be working, is this the best way, or is there something better and maybe even quicker?
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Nov 20, 2011
How do you define a global variable that is accessible across all views on Flex mobile / Flex 4.5/4.6
(Edited for clarification)
Is it still necessary to have to use a separate global class?
(additional) There is a new PersistanceManager in Flex 4.5, is there something like a GlobalObjectsManager that can be used to just set/get stuff in memory?
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Nov 21, 2011
What are the criteria for decomposing a Flex applicaiton to views? I find quite difficult to apply the Single Responsibility Principle in this context.I've come to the following conclusions through my experience:More monolithic approach(e.g. one view per tab, lots of panels in the same tab)Very easy communication between components as only one Presentation Model is used Cannot use multiple States, only on the top level component.More modular approach (e.g. one view per panel)(the opposite to the monolithic one)
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May 17, 2010
I have data model (dataProvider as ArrayCollection) i want to display in few views , each view should show filtered data. As you probably know, filterFunction is property of ArrayCollection,so I can't use this solution (unless creating new instance of ArrayCollection for each view on top original and impementing filterFunction).
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Dec 14, 2010
I'm looking to create a flashBuilder document which uses seperate MXML files as "views" which are controlled by states - I believe it's a design pattern of sorts but I'm relatively new to FlashBuilder. I was wondering if anyone knew what design pattern it was and if I can be pointed in the direction of some good references! FYI I'm looking into using FlashBuilder to design Android apps
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Aug 10, 2011
I have a list of txt files and when one is selected it is read and assigned to a string variable. this string is then pushed to a view : pushView(viewer, string), where the string is displayed in a textarea. I want to also pass the relative path of the file also. Is this possible to pass two strings?
[Code]...
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Feb 22, 2012
I have a SplitViewNavigator with two split views. In one of the views I have a list and in another one I have questions. User must solve the question and when user click send button, he will see another question.
But when user click to send button in one view, how can i know this in the other view? I'm a newbie in Flash Builder and I'm searching for this for hours.
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Jan 11, 2010
I have application with a viewstack witch load 5 modules. each module is loaded via the moduleLoader tag and they all have an id.
Every loaded module has a context menu. the context menu has 5 menuItems. one menuItem for each view for the viewstack.
The context menu is loaded via xml.
this is my application file.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute"
backgroundColor="#b1b1b1"
[Code].....
the xml of the context menu is in the module but, the context menu is in a as file that extensiate a button.
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Feb 22, 2010
This appeared as I was trying to use a mouseEvent to move an object.I placed the variables for mouseX and mouseY in the public class. I did the same for direction X and Y but there was no error message for those.
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Sep 12, 2011
I'm working on an app in which I want the viewstack to switch views on certain events. I have them switching correctly but there appears to be a slight "blink" when the change between views occurs. I've tried creationPolicy="all" but that doesn't fix the problem. The reason the "blink" is so noticeable is the fact that the views in the viewstack are different width/heights. Is there a way to stop this "blinking" effect on viewstack view switch?
[Code]...
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