> When I am inside one of the components I want to access the
> same doubleclick function I use in the main mxml. However
> since the as file the doubleclick code is in is included in
> the main mxml the component can't see the function. I have
> to add the mx.core.Application.application.____ in order for
> the component to see it.
The key here is to stop thinking about it as "inclusion". That will
lead to very brittle applications where you can't easily write reusable
code.
What you need to do is to have your application pass a reference to
either your application or pieces of your application down to your
helper classes. One option is to simply pass a reference to a
particular Function down to your helper code. However, I prefer using
interfaces; here's an example:
I'm going to skip a lot of syntactic sugar (imports and package and
whatnot) in order to try to type this in this lousy email IDE. No
promises that it will actually work, I haven't tested this because
Microsoft Outlook doesn't have a "run" button. :-)
// IGreeting.as - interface for things that know how to print greetings
public interface IGreeting
{
function get greet():String;
}
// World.as - a little object that uses the services of a greeter
public class World
{
public function set greeting( greeting:IGreeting ):Void
{
_greeting = greeting;
}
public function get print():String
{
return _greeting.greet + " world";
}
private var _greeting:IGreeting;
}
// MyApp.mxml - an app that implements the IGreeting interface and lets
// its services be used by the World object. (Could just as easily be
an .as app!)
<mx:Application implements="IGreeting" initialize="setup()">
<mx:Script>
private var world:World = new World();
private function setup():Void
{
world.greeting = this;
}
public function get greet()
{
return "hello";
}
</mx:Script>
<mx:Button label="{world.print}" />
</mx:Application>
So, if I were writing this stuff, I might not want to have the IGreeting
implementation in the app, I might want to reuse that as well. So, lets
treat it as a sort of mixin...
// HelloGreeter.as
public class HelloGreeter implements IGreeting
{
public function get greet()
{
return "hello";
}
}
Just for kicks, lets add a different IGreeting implementation.
// HowdyGreeter.as
public class HowdyGreeter implements IGreeting
{
public function get greet()
{
return "howdy";
}
}
// MyApp.mxml - mostly the same app, except this one delegates the
greetings.
// We'll also make it so it can change greeters on the fly
<mx:Application initialize="setup()">
<mx:Script>
private var world:World;
private function setup():Void
{
world = new World();
world.greeting = new HelloGreeter();
}
private function change():Void
{
world.greeting = new HowdyGreeter();
}
</mx:Script>
<mx:Button label="{world.print}" />
<mx:Button label="change the greeting" click="change()" />
</mx:Application>
All of the reusable classes (IGreeting, HelloGreeter, HowdyGreeter,
World) could easily be put off in a dedicated package hierarchy so that
they could be shared between multiple apps. To really encapsulate them,
package them up into a SWC library using compc.exe.
Hope this gives you some ideas,
-rg
> -----Original Message-----
> From: flexcoders@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Greg Johnson
> Sent: Wednesday, November 02, 2005 6:05 AM
> To: flexcoders@yahoogroups.com
> Subject: [flexcoders] Re: Flex 2:Package/Class problem
>
> Well that definatly clears up a few things that were confusing me.
>
> Basicaly what I am doing is that we have several intrAnet
> applications that we are trying to create a central reporting
> system for.
>
> In all cases the reports will be based on a person or list of
> people. We have a tabed interface where the first tab lets
> the manager build the list of people. They can do this
> either by searching for and selecting individual people which
> builds a list of people's unique campus wide ID, or using
> departments and department codes, or eventually companies and
> company codes.
>
> When you click on the next tab it takes whichever type of
> list the manager built and generates a list of whatever in a
> dataGrid. You can then double click on a row and it uses a
> accordian to show a viewstack with all the details for that record.
>
> However instead of coding the visual part all in one mxml
> file I have a main mxml file with the search, then each
> additional tab I have in a seperate mxml file as a component.
> So in the tabNavigator I simply add lines like <local:otdTab
> id="otdTabHandle"/>
>
> When I am inside one of the components I want to access the
> same doubleclick function I use in the main mxml. However
> since the as file the doubleclick code is in is included in
> the main mxml the component can't see the function. I have
> to add the mx.core.Application.application.____ in order for
> the component to see it.
>
> So what I would rather do is just be able to add a include or
> something in the component making the functions already
> loaded in the main file available to the component file.
> --- In flexcoders@yahoogroups.com, "Roger Gonzalez" <[EMAIL PROTECTED]>
> wrote:
> >
> > This seems like you're talking about a couple different things here.
> > I'm not sure I understand where mx.core.Application.application
> comes
> > into it.
> >
> > You can do the same thing with source as you can with a SWC;
> >
> > Make a new directory tree, looks like you're using mrstd.
> >
> > Then, you'll make one source file per class (that you are currently
> > putting in one file). Name the source file the same as the
> classname.
> >
> > BTW - several of your utility functions should probably really be
> static
> > - there's no reason to create a class instance just to call a
> function
> > when there are no vars on the object!
> >
> > Add the directory one level above the mrstd directory to your
> > actionscript-classpath (either via the flex-config file or by
> setting it
> > in FlexBuilder; Project > ActionScript Build Path > Class path.
> >
> > When you want to use these classes from some other file, just do
> > import mrstd.*;
> >
> > Use the classes as you would expect.
> >
> > This should get you most of the way there.
> >
> > Ok, so what if you want to hand your mrstd classes off to someone
> else?
> > Or maybe you don't want to keep compiling them? That's when you
> need a
> > SWC. Unfortunately, the alpha build of FlexBuilder doesn't have
> any SWC
> > support built-in, so you need to drop down to the command line.
> >
> > Run compc.exe -i source source source -o mrstd.swc
> >
> > Go back into FlexBuilder, and remove the mrstd directory from the
> > classpath, and add the mrstd.swc file to the library path tab.
> >
> > Is this what you need?
> >
> > -Roger
> >
> > Roger Gonzalez
> > mailto:[EMAIL PROTECTED]
> >
> >
> > > -----Original Message-----
> > > From: flexcoders@yahoogroups.com
> > > [mailto:[EMAIL PROTECTED] On Behalf Of Greg Johnson
> > > Sent: Tuesday, November 01, 2005 11:45 AM
> > > To: flexcoders@yahoogroups.com
> > > Subject: [flexcoders] Re: Flex 2:Package/Class problem
> > >
> > > This is a part I didn't even get a chance to get into with 1.5 so
> im
> > > coming kinda late in 2.
> > >
> > > In my post you saw the functions that I want to make so I can use
> > > them all over without having to use
> > > "mx.core.Application.application." every time I use one.
> > >
> > > Most of them I use in .as files not .mxml files. And the ones I
> use
> > > in the .mxml files I usually use as function calls. Like for a
> grid
> > > column that contains a date, I use the dateFunction parameter and
> > > give the function name.
> > >
> > > I have looked at the interface and class builder "wizards". But
> > > didn't really get anywhere with them. I definatly need to
> optimize
> > > as much as I can as the applications I will be working on are
> going
> > > to be extensive in some cases.
> > >
> > > Can you point me somewhere that shows how to build a "library"
> that I
> > > can use in any code I have by just putting in the import
> > > mylib.whatever.*?
> > >
> > > Thanks
> > > Greg
> > >
> > > --- In flexcoders@yahoogroups.com, "Roger Gonzalez"
> <[EMAIL PROTECTED]>
> > > wrote:
> > > >
> > > > How so? A library isn't one file.
> > > >
> > > > You should package everything up by making a manifest file so
> that
> > > you
> > > > can use your classes as MXML tags, and then use compc.exe to
> bundle
> > > a
> > > > SWC. You can also bundle in additional stuff like icons and
> CSS and
> > > > whatnot.
> > > >
> > > > Its a much more efficient distribution and packaging mechanism!
> > > >
> > > > -Roger
> > > >
> > > > Roger Gonzalez
> > > > mailto:[EMAIL PROTECTED]
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: flexcoders@yahoogroups.com
> > > > > [mailto:[EMAIL PROTECTED] On Behalf Of Greg Johnson
> > > > > Sent: Tuesday, November 01, 2005 8:05 AM
> > > > > To: flexcoders@yahoogroups.com
> > > > > Subject: [flexcoders] Re: Flex 2:Package/Class problem
> > > > >
> > > > > Hmm, well that pokes a hole in that plan. If I have to
> create a
> > > > > bunch of different files it kinda is contrary to my goal of
> > > combining
> > > > > things into one main generic library :(
> > > > >
> > > > > --- In flexcoders@yahoogroups.com, "Geoffrey Williams"
> > > <[EMAIL PROTECTED]>
> > > > > wrote:
> > > > > >
> > > > > > You can only have one public function / class / prop
> per .as
> > > file.
> > > > > Also, the
> > > > > > .as files name must match that of the function / class /
> prop.
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: flexcoders@yahoogroups.com
> > > > > [mailto:[EMAIL PROTECTED] On
> > > > > > Behalf Of Greg Johnson
> > > > > > Sent: Tuesday, November 01, 2005 9:43 AM
> > > > > > To: flexcoders@yahoogroups.com
> > > > > > Subject: [flexcoders] Flex 2:Package/Class problem
> > > > > >
> > > > > > I am tryinig to create a class with functions that I use
> > > repeatedly
> > > > > > so I can just include them in different
> > > components/applications.
> > > > > As
> > > > > > far as I can tell I have written it correctly, but when I
> use
> > > an
> > > > > > include, and they try calling one of the functions, it
> doesn't
> > > work.
> > > > > >
> > > > > > Here is the package
> > > > > > package mrstd{
> > > > > > // Imported Libraries
> > > > > > import mx.managers.PopUpManager;
> > > > > > import mx.containers.TitleWindow;
> > > > > > import mx.controls.gridclasses.DataGridColumn;
> > > > > > import mx.managers.DragManager;
> > > > > > import mx.events.DragEvent;
> > > > > > import mx.formatters.*
> > > > > > import flash.util.Timer;
> > > > > >
> > > > > > // Standard Library Class
> > > > > > public class stdlib {
> > > > > > // Does what it says, used when a
> > > function has to be
> > > > > > called, but you don't actually want to do anything
> > > > > > public function doNothing():Void {}
>
> > > > > >
> > > > > > // Get Today's Date as a string
> > > > > > public function getToday():String {
> > > > > > var today_date:Date = new Date();
> > > > > > var date_str:String =
> > > ((today_date.getMonth()
> > > > > > +1)+"/"+today_date.getDate()+"/"+today_date.getFullYear());
> > > > > > return date_str;
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > // Mouse Related Functions
> > > > > > public class mouseHandlers {
> > > > > > // Handles drag and drop events.
> > > > > > public function
> > > doDragDrop(event:DragEvent):Void {
> > > > > > private var items:Array =
> > > > > > event.dragSource.dataForFormat("items");
> > > > > > private var dest:Object =
> > > event.currentTarget;
> > > > > > private var dropLoc:int =
> > > dest.getDropLocation
> > > > > > ();
> > > > > > dest.hideDropFeedback(event);
> > > > > > items.reverse();
> > > > > > var l:int = items.length;
> > > > > > for(var i:int = 0; i < l; i++) {
> > > > > >
> > > dest.dataProvider.addItemAt(items[i],
> > > > > > dropLoc);
> > > > > > }
> > > > > > event.preventDefault();
> > > > > > }
> > > > > >
> > > > > > // Variables used for detectDoubleClick
> function
> > > > > > private var lastClick:int = 0;
> > > > > > private var lastObject:Object = new Object();;
> > > > > > private var lastIndex:int = 0;
> > > > > > private var maxTicks:int = 300;
> > > > > >
> > > > > > // Detect if a double click was made
> > > and if so, call
> > > > > > a function
> > > > > > public function detectDoubleClick
> (event:Object,
> > > > > > functionToCall:Function, ... args):Void {
> > > > > > var currentClick:int;
> > > > > > var currentObject:Object;
> > > > > > var currentIndex:int;
> > > > > > var clickDif:int;
> > > > > > currentClick = getTimer();
> > > > > > currentObject = event.target;
> > > > > > currentIndex = event.index;
> > > > > > clickDif = currentClick - lastClick;
>
> > > > > > if( clickDif <= maxTicks &&
> > > currentObject ==
> > > > > > lastObject && currentIndex == lastIndex ) {
> > > > > > lastClick = currentClick;
> > > > > > lastObject = currentObject;
> > > > > > lastIndex = currentIndex;
> > > > > > if (args[0] == null) {
> > > > > > functionToCall();
> > > > > > } else {
> > > > > > functionToCall(args);
> > > > > > }
> > > > > > }
> > > > > > lastClick = currentClick;
> > > > > > lastObject = currentObject;
> > > > > > lastIndex = currentIndex;
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > // Standard Formaters
> > > > > > public class formaters {
> > > > > > private var
> > > StdMoneyFormat:CurrencyFormatter = new
> > > > > > CurrencyFormatter();
> > > > > > private var StdDateFormat:DateFormatter = new
> > > > > > DateFormatter();
> > > > > > StdMoneyFormat.precision=2;
> > > > > > // Formats a dataGrid cell as money
> > > > > > public function formatMoney(dpItem:Object,
> > > > > > dgColumn:DataGridColumn):String {
> > > > > > return
> StdMoneyFormat.format(dpItem [dgColumn.columnName]);
> > > > > > }
> > > > > >
> > > > > > // Formats a dataGrid cell as a date
>
> > > > > > public function formatDate(dpItem:Object,
> > > > > > dgColumn:DataGridColumn):String {
> > > > > > return
> StdDateFormat.format(dpItem [dgColumn.columnName]);
> > > > > > }
> > > > > >
> > > > > > // Formats a dataGrid cell as a string
> > > that is x
> > > > > > characters long followed by an elipse
> > > > > > public function shortString(dpItem:Object,
> > > > > > dgColumn:DataGridColumn, x:Number):String {
> > > > > > var tmpString:String;
> > > > > > tmpString = dpItem
> [dgColumn.columnName];
> > > > > > if (tmpString.length > x) {
> > > > > > tmpString =
> > > tmpString.substr(0,x);
> > > > > > tmpString =
> > > tmpString.concat('...');
> > > > > > }
> > > > > > return tmpString;
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > // General Error Window Handlers
> > > > > > public class errHandlers {
> > > > > > // CFC Error Handler Function
> > > > > > public function cfcerr(cfcName:String,
> functionName:String,
> > > > > > faultCode:String, faultString:String, description:String,
> > > > > > details:String):Void {
> > > > > > var cfcErrPopUp:cfcError = cfcError
> > > > > > (PopUpManager.createPopUp(this, cfcError, true));
> > > > > > cfcErrPopUp.cfcName.text = cfcName;
> > > > > > cfcErrPopUp.functionName.text =
> > > functionName;
> > > > > > cfcErrPopUp.faultCode.text =
> faultCode;
> > > > > >
> cfcErrPopUp.faultString.htmlText = faultString;
> > > > > >
> cfcErrPopUp.description.htmlText = description;
> > > > > > cfcErrPopUp.detail.htmlText = details;
> > > > > > }
> > > > > >
> > > > > > // Error Handler Function
> > > > > > public function err(message:String,
> source:String):Void {
> > > > > > var errpop:stdErr = stdErr
> > > > > > (PopUpManager.createPopUp(this, stdErr, true));
> > > > > > errpop.source.text = source;
> > > > > > errpop.message.text = message;
> > > > > > }
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > In the .as file I put
> > > > > >
> > > > > > import mrstd.errHandlers.err;
> > > > > >
> > > > > > and then down in the script I make a call to the err
> function
> > > > > >
> > > > > > err("sometext","sometitle");
> > > > > >
> > > > > > But I get an error at that line saying "Access of undefined
> > > > > property
> > > > > > err"
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
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