[flexcoders] UIComponent.graphics not respecting a grandparent's clipContent
Hi, I'm observing some strange behavior regarding the clipContent of a Canvas as applied to some lines that are programatically drawn via one of its grandchildren's Sprite.graphics object. What I am seeing is that the clipContent property is not respected by its grandchildren (kids these days have no respect) if the intermediate child is not outside of the Canvas's boundaries. A diagram might help me explain this better: Canvas id=workspace width=200 height=200 clipContent=true UIComponent id=drawingLayer width=200 height=200/ /Canvas If I programatically add children to drawingLayer, and then use those children's graphics property to draw lines programatically, the lines will appear outside of workspace. What is interesting is that if I change the width and height of drawingLayer to 201 (so that a part of drawingLayer appears outside the boundaries of workspace), then the workspace.clipContent is respected and the lines are clipped as expected. Unfortunately, I cannot use this as a workaround because workspace needs its scroll policies set to auto for other reasons, and having drawingLayer outside of workspace would cause undesirable scroll bars. Am I describing a known bug? (Btw I can post a 20-line sample application that demonstrates this.) Thanks in advance! Erik
Re: [flexcoders] UIComponent.graphics not respecting a grandparent's clipContent
On Nov 26, 2007 2:29 PM, Daniel Freiman [EMAIL PROTECTED] wrote:
This is by design. Flex clipping is expensive (at least relative to not
clipping), so Flex Containers don't clip unless measurement says they
should. Drawing isn't included in measurement. You can use
mx_internal::forceClipping but then you're using mx_internal.
Thanks for the response, Dan. That makes a lot of sense, but it would
be great if the AS3doc for clipContent went into that detail. I'll
check the bug database to see if it's already been logged and if not,
log it as a docs enhancement.
For anyone else who may run into this problem, I was able to use a
workaround following an approach something like this example:
Script
private function handleResize(event:ResizeEvent):void
{
drawingLayerMask.graphics.clear();
drawingLayerMask.graphics.drawRect(0, 0, workspace.width, workspace.height);
}
/Script
Canvas id=workspace resize=handleResize(event)
UIComponent id=drawingLayer mask={drawingLayerMask}/
UIComponent id=drawingLayerMask/
/Canvas
Regards,
Erik
Re: [flexcoders] Parameter passing !! I am shocked
On 6/7/07, Guido [EMAIL PROTECTED] wrote: I'm not really familiar with technical specifications on how AS manages argument references. However, I believe this has more to do with OO Paradigm than with AS. This is unrelated to the issue at hand. On 6/7/07, Jeffry Houser [EMAIL PROTECTED] wrote: I think you missed his point. He sent in obj as a parameter to a function. So objParam should be a reference to obj; and nulling one should definitely null the other. Not really true. I think it is more helpful to think of it this way (most popular languages use this exact same design): 1. When a parameter is passed to a function or method call, it is ALWAYS pass-by-value (i.e., makes a copy of it local to the function). But the thing being passed/copied is not the actual object itself, but rather, a pointer or reference to an object. 2. Therefore, if you pass a reference to an object to a function or method as a parameter, you have a COPY of the reference, but both your in-function copy AND your out-of-function original both point to the same object out there on the heap. 3. Therefore, if you set your parameter reference to null, you're nulling out your local copy of the reference. But the reference from outside of the function still exists, and is not set to null (because only the COPY was set to null). Therefore, the object will not magically disappear. To summarize, you can't set an object to null in the first place. You can only set references to objects to null. Therefore, if you have a reference to object A outside of your function, and a reference to object A inside of your function, setting one to null does not mean the other is set to null. It's all pass by value, just keep in mind it's the REFERENCES that are getting passed by value (i.e., copied), not the objects themselves. e
[flexcoders] how to eliminate the grey background of a disabled TileList
Hi, Caveat: this question is for a Flex 1.5 app. Question: How do I prevent the TileList from creating a grey background color when I set enabled=false ? backgroundDisabledColor doesn't seem to apply to the selected item. What I have done so far: In my app I have a TileList component, whose background color is normally #FF, that I have disabled by setting its enabled property to false in the MXML file. This resulted in the entire TileList having a grey color over (or under) it, which is the default behavior for a disabled TileList. I found the backgroundDisabledColor and set it to #FF, which ALMOST solves the problem. The remaining issue is that the currently selected item in the TileList still has the grey background. So, to paint a picture of what it looks like, my disabled TileList has a white background for all of the cells except the one that is selected. Any advice you can provide would be gratefully appreciated. Erik
Re: [flexcoders] Re: Error: default arguments may not be interspersed with other options
On 4/30/07, Shailesh Mangal [EMAIL PROTECTED] wrote: Thanks Bjorn, It certainly worked, So you keep two copies of SDK or is there a way to point FlexBuilder to this new version of FlexSDK and delete from its original location (/Applications/Adobe Flex Builder 2 Plug-in/Flex SDK 2/) I symlinked the Flex SDK to /usr/local/flex_sdk and added that to my $PATH, that way I can always change what the symlink is pointing to, but all of my scripts and configuration can just reference /usr/local/flex_sdk. You will probably need to use 'sudo' to create the symlink. It sounds like for your setup, you'd need to issue this command: sudo ln -s /Applications/Adobe Flex Builder 2 Plug-in/Flex Sdk 2 /usr/local/flex_sdk e
Re: [flexcoders] Dynamic UI requires view-aware Commands, no?
On 4/30/07, ben.clinkinbeard [EMAIL PROTECTED] wrote: Basically, when the user selects a certain task, I need to attach a set of screens to the stage and allow them to begin working. If they later choose a different option, I need to remove the existing stack and attach the new one. I don't know enough about Cairngorm to say whether this would work with that framework, but is this something that States can help you with? I.e., databind the states to the user's task selection in the UI, and add the appropriate children to the display list in that state? This would let you keep your view code in the view and not pollute your command http://livedocs.adobe.com/flex/2/docs/0924.html#391089 e
Re: [flexcoders] Games in Flex / Apollo?
On 4/27/07, André Rodrigues Pena [EMAIL PROTECTED] wrote: I was also considering to develop something for flex-based games. But I think that, the only reason that could lead someone to do this would be the AS3 capabilities but now Flash CS3 has come up with this technology, and it has a bunch of other functionalities to help with gaming. (True, but Flash CS3 is $699 more than the cost of the Flex SDK.) e
Re: [flexcoders] Find and replace wih regex?
On 4/26/07, b_alen [EMAIL PROTECTED] wrote: I have a huge XML file with complex DTD. Now I have to parse this into something more usable by stripping the redundant tags and modifying some of them. I see two options: 1. Recursivly visit all the nodes and handle them with if statements. 2. Use RegEx to do some sort of find and replace. The second options seems easier and faster if someone can point me in the right direction. Or maybe some other ideas? Just an idea - if your XML is coming from the server, perhaps running an XSL transformation on the document would be easier and faster. e
Re: [flexcoders] Re: Module GC question
On 4/26/07, kyle.vanvranken [EMAIL PROTECTED] wrote:
UPDATE: So it would seem the hack method of forcing garbage collection
for my test was actually causing the trouble.
-
try {
new LocalConnection().connect('foo');
new LocalConnection().connect('foo');
} catch (e:*) {}
-
Without that code it seems to be working nicely now. I've had a test
app running on my machine now for a bit with a timer every couple
seconds reloading the simple module and it appears to be working as
intended now. I don't really understand why forcing GC was causing it
to eat up more memory then not forcing, but I am sufficiently
satisfied that it seems to be working.
How are you sure that the hack was actually causing GC? Is that
documented anywhere?
e
Re: [flexcoders] Re: Inserting data from Flex: FDS vs. HTTPService vs. RemoteObject
On 4/25/07, Scott Hoff [EMAIL PROTECTED] wrote: C or perl. When people say CGI, do they refer to server side scripting in general or do they refer to a specific programming language? Technically, CGI is a language-agnostic protocol to allow a web server to communicate with another application on the host (such as a Python script or a C binary, for example). But in my experience, when most people say CGI, they're simply using as a shorthand way of saying server side programming in general. e
Re: [flexcoders] Re: Inserting data from Flex: FDS vs. HTTPService vs. RemoteObject
On 4/25/07, Erik Price [EMAIL PROTECTED] wrote: script or a C binary, for example). But in my experience, when most people say CGI, they're simply using as a shorthand way of saying server side programming in general. I should add to that, server side programming in general, using HTTP, without the use of a remoting framework or other abstraction of HTTP. In other words, they mean sending HTTP variables to the server directly. AMFPHP, for example, is more advanced than this and thus doesn't really qualify as CGI (even if the remoting implementation uses the CGI protocol on some level), since it abstracts the programmer from the details of HTTP. Opening a network socket directly might not make use of HTTP at all, so that doesn't really qualify as CGI either. e
Re: [flexcoders] Re: Inserting data from Flex: FDS vs. HTTPService vs. RemoteObject
On 4/25/07, Scott Hoff [EMAIL PROTECTED] wrote: What makes AMFPHP much more advanced? Is that something I should just google? Always google. But in a nutshell, AMFPHP provides remoting facilities. This means it attempts to abstract some of the details of the transport of data between your Flex application and your server-side code. http://en.wikipedia.org/wiki/Remoting e
Re: [flexcoders] A big newbie flex question.
On 4/25/07, Ian Skinner [EMAIL PROTECTED] wrote: So, one has managed to wade through all that exposition, what is a good way to do this? Where do I put the data access logic. I presume in my You might want to read up on MVC: http://en.wikipedia.org/wiki/Model_view_controller root application file. But, if I do that, how do I access it from my various view pieces? How do I connect all the dots? Your view pieces (components) shouldn't call your data access logic. Instead, they should fire (possibly custom) events when the user does something. In your Main.mxml, or better yet in a controller layer of ActionScript classes (see MVC, above), you will write code to listen for these events and call the data access logic code, which itself probably belongs in yet another separate layer of ActionScript classes. This process of factoring out your application into layers is called architecture, and there's an infinite number of ways to do it. When people recognize a general pattern for doing this, they usually will construct a framework to facilitate re-use and avoid repetition. The Cairngorm framework is an example of this. e
Re: [flexcoders] How do you Scroll programmatically in a Panel
On 4/25/07, jensen.axel [EMAIL PROTECTED] wrote: but all of that i can eventually figure out... I just need some direction on how to scoll in the panel, programmatically... Set the panel's 'verticalScrollPosition' property when you need to change the scroll position. e
Re: [flexcoders] Datagrid scrollbar lag
On 4/24/07, Austin Kottke [EMAIL PROTECTED] wrote: Hi. I've got a datagrid with about 60 rows and 30 columns. Each has a custom item renderer that extends a Canvas component. The scrollbar that appears is lagging majorly with this set. I've tried cacheasBitmap, Implementing different dataproviders such as XMLListCollection and other things to somewhat speed up the lag-also changing framerate. It seems that the scrollbar lag stays. Anyone have any ideas on this? Alex Harui's blog suggests that extending Canvas in a DataGrid's ItemRenderer is probably not a good idea if you have a lot of visible cells, because of the overhead that comes with using a container (they do a lot behind the scenes that you might not really need). His recommendation is to extend UIComponent directly and programatically lay out your view of the item. e
Re: [flexcoders] Root sprite not responding to MouseEvent ?
On 4/19/07, Ronnie Liew [EMAIL PROTECTED] wrote: the main app is a sprite, it should respond to mouse move right? and it does have a child and that is the visible pixel. How come it doesn't trace out? Did you forget to add your Sprite to the Stage? e
Re: [flexcoders] REPOST - Checkboxes in a DataGrid
On 4/16/07, zzberthod [EMAIL PROTECTED] wrote: I just need to insert graphical elements (ex: MXML checkbox) into the list. Example: - The first column is a checkbox (for selection of the line) - The second is the `name' column - Third is `date' -- |Select | Name | Date -- | X | Justin | 01/12/07 | | Martin | 01/15/07 | X | John | 01/17/07 -- You can specify an ItemRenderer when you declare your DataGrid's columns, which can customize the appearance of a column's content. An example using ItemRenderers: http://www.cflex.net/showFileDetails.cfm?ObjectID=443ChannelID=1 Once you've played with it, read this for caveats: http://blogs.adobe.com/aharui/2007/03/thinking_about_item_renderers_1.html e
Re: [flexcoders] passing variables to Timer handler routine
On 4/10/07, dougco2000 [EMAIL PROTECTED] wrote: But since Timer calls a new function, how to best pass along any objects or strings that it will need, other than have these as global vars? Excellent question. It's answered here: http://flexblog.faratasystems.com/?p=125 e
Re: [flexcoders] dynamic creation of class
On 4/8/07, Toby Tremayne [EMAIL PROTECTED] wrote:
Hi all,
I have a method which retrieves an actionscript object, and depending on
the value of one of the keys, converts it into an actionscript class. The
issue I have is I don't know how to instantiate a class whose name
I can't hard code - can anyone help me with this?
Basically the idea is that if obj.classname = Page then I need to write
oPage : Page = new Page(); dynamically. Is there any way to do this in
actionscript?
You can use the getDefinitionByName function to retrieve a reference to a
Class, and then you can create an instance of that class using the new
operator on the Class reference. The following is a very simplistic
demonstration of how to instantiate the instances, but in practice you will
probably want all of your dynamically-instantiated classes to implement a
common interface, and cast the instantiated objects to that interface, so
that you don't have to write a bunch of conditionals into your code every
time you add a new class:
?xml version=1.0 encoding=utf-8?
mx:Application xmlns:mx=http://www.adobe.com/2006/mxml;
applicationComplete=appComplete( event );
mx:Script
![CDATA[
import defaultpckg.MyClass;
private function appComplete( event : Event ) : void
{
var classRef : Class = getDefinitionByName( defaultpckg.MyClass )
as Class;
var myInstance : MyClass = new classRef() as MyClass;
myInstance.message = Done;
myInstance.showMessage();
}
]]
/mx:Script
/mx:Application
In a separate file, ./defaultpckg/MyClass.as:
package defaultpckg
{
import mx.controls.Alert;
public class MyClass
{
private var _message : String;
public function set message( msg : String ) : void
{
this._message = msg;
}
public function showMessage() : void
{
Alert.show( this._message );
}
}
}
