[flexcoders] Re: Adding/Removing child components
Thank you all.
...to an extent, the repeater brings the functionality in place.
here is the code:
?xml version=1.0?
mx:Application xmlns:mx=http://www.adobe.com/2006/mxml;
mx:Script
![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
public var ar:ArrayCollection = new ArrayCollection
([{}]);
public function remove(i:Number):void
{
ar.removeItemAt(i);
}
public function add():void
{
ar.addItem({});
}
public function calcRowHeight(isHidden:Boolean):Number
{
var retVal:Number=25;
if(isHidden)
retVal = 0;
return retVal;
}
]]
/mx:Script
mx:Grid verticalGap=1
mx:Repeater id=Rep dataProvider={ar}
mx:GridRow id=gridrow height={calcRowHeight
(Rep.currentItem.isHidden)}
mx:GridItem id=griditem
height={calcRowHeight(Rep.currentItem.isHidden)}
mx:Button id=remBtn
label=Remove click=remove(event.target.repeaterIndices)/
/mx:GridItem
/mx:GridRow
/mx:Repeater
/mx:Grid
mx:HBox visible=true horizontalGap=1 height=100%
width=100%
mx:HBox height=100% width=100%/
mx:HBox height=100% width=10%
mx:LinkButton label=Add click=add()/
/mx:HBox
/mx:HBox
/mx:Application
--- In flexcoders@yahoogroups.com, Tom Chiverton [EMAIL PROTECTED]
wrote:
On Tuesday 06 May 2008, kalpkat9 wrote:
I dont know where I am missing it, but I am only able to remove
the
lines from the bottom of the stack and I wish to remove the line
items as such with their relevant index.
If you use a Repeater bound to an ArrayCollection of the items, you
could use
ArrayCollection.removeItemAt() and it should Just Work.
--
Tom Chiverton
Helping to conveniently unleash world-class content
on: http://thefalken.livejournal.com
This email is sent for and on behalf of Halliwells LLP.
Halliwells LLP is a limited liability partnership registered in
England and Wales under registered number OC307980 whose registered
office address is at Halliwells LLP, 3 Hardman Square,
Spinningfields, Manchester, M3 3EB. A list of members is available
for inspection at the registered office. Any reference to a partner
in relation to Halliwells LLP means a member of Halliwells LLP.
Regulated by The Solicitors Regulation Authority.
CONFIDENTIALITY
This email is intended only for the use of the addressee named
above and may be confidential or legally privileged. If you are not
the addressee you must not read it and must not use any information
contained in nor copy it nor inform any person other than Halliwells
LLP or the addressee of its existence or contents. If you have
received this email in error please delete it and notify Halliwells
LLP IT Department on 0870 365 2500.
For more information about Halliwells LLP visit www.halliwells.com.
[flexcoders] Re: Adding/Removing child components
Tom and Tracy both have good suggestions. However, I'd recommend using any of the List based controls, with an itemRenderer, instead of using a repeater. Unlike the Repeater component, which instantiates all objects that are repeated (no recycling), the List based controls instantiate only objects visible in the list. I dont know where I am missing it, but I am only able to remove the lines from the bottom of the stack Your problem is with this line: myAcc.removeChild(vBoxes.pop());. Here you are using the array method pop; which always removes the last element in an array. While the removeChild method works here, since the value of the removed array element is returned from pop, this is kind of a backwards way of controlling the displayList. There may be some confusion here about collections (data) and the display list (components). While you can certainly create an array and/or arrayCollection of components, it's much easier to create and maintain a List based control; with an arrayCollection of data bound as the dataProvider.Then, as Tom indicated, use the built-in ArrayCollection methods to add/remove the data; and the display automatically adjusts. All that you have to do is something like: myACC.removeItemAt(myList.selectedIndex) ; -TH --- In flexcoders@yahoogroups.com, Tracy Spratt [EMAIL PROTECTED] wrote: Yes, unless you have some special needs, using Repeater for your dynamic instantiation will save you a lot of work. Plus Repeater supports recycleChildren, which will help with performance over creating and removing children. Tracy -Original Message- From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Tom Chiverton Sent: Tuesday, May 06, 2008 11:15 AM To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Adding/Removing child components On Tuesday 06 May 2008, kalpkat9 wrote: I dont know where I am missing it, but I am only able to remove the lines from the bottom of the stack and I wish to remove the line items as such with their relevant index. If you use a Repeater bound to an ArrayCollection of the items, you could use ArrayCollection.removeItemAt() and it should Just Work. -- Tom Chiverton Helping to conveniently unleash world-class content on: http://thefalken.livejournal.com This email is sent for and on behalf of Halliwells LLP. Halliwells LLP is a limited liability partnership registered in England and Wales under registered number OC307980 whose registered office address is at Halliwells LLP, 3 Hardman Square, Spinningfields, Manchester, M3 3EB. A list of members is available for inspection at the registered office. Any reference to a partner in relation to Halliwells LLP means a member of Halliwells LLP. Regulated by The Solicitors Regulation Authority. CONFIDENTIALITY This email is intended only for the use of the addressee named above and may be confidential or legally privileged. If you are not the addressee you must not read it and must not use any information contained in nor copy it nor inform any person other than Halliwells LLP or the addressee of its existence or contents. If you have received this email in error please delete it and notify Halliwells LLP IT Department on 0870 365 2500. For more information about Halliwells LLP visit www.halliwells.com. -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups Links
[flexcoders] Re: Adding/Removing child components
Wanted to clarify that when I say (no recycling), I'm refering to itemRenderer reuse with the same set of data. The recycleChildren property of a Rpeater does allow for the re-use of children; when a new data is used. -TH In flexcoders@yahoogroups.com, Tim Hoff [EMAIL PROTECTED] wrote: Tom and Tracy both have good suggestions. However, I'd recommend using any of the List based controls, with an itemRenderer, instead of using a repeater. Unlike the Repeater component, which instantiates all objects that are repeated (no recycling), the List based controls instantiate only objects visible in the list. I dont know where I am missing it, but I am only able to remove the lines from the bottom of the stack Your problem is with this line: myAcc.removeChild(vBoxes.pop());. Here you are using the array method pop; which always removes the last element in an array. While the removeChild method works here, since the value of the removed array element is returned from pop, this is kind of a backwards way of controlling the displayList. There may be some confusion here about collections (data) and the display list (components). While you can certainly create an array and/or arrayCollection of components, it's much easier to create and maintain a List based control; with an arrayCollection of data bound as the dataProvider. Then, as Tom indicated, use the built-in ArrayCollection methods to add/remove the data; and the display automatically adjusts. All that you have to do is something like: myACC.removeItemAt(myList.selectedIndex) ; -TH --- In flexcoders@yahoogroups.com, Tracy Spratt tspratt@ wrote: Yes, unless you have some special needs, using Repeater for your dynamic instantiation will save you a lot of work. Plus Repeater supports recycleChildren, which will help with performance over creating and removing children. Tracy -Original Message- From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Tom Chiverton Sent: Tuesday, May 06, 2008 11:15 AM To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Adding/Removing child components On Tuesday 06 May 2008, kalpkat9 wrote: I dont know where I am missing it, but I am only able to remove the lines from the bottom of the stack and I wish to remove the line items as such with their relevant index. If you use a Repeater bound to an ArrayCollection of the items, you could use ArrayCollection.removeItemAt() and it should Just Work. -- Tom Chiverton Helping to conveniently unleash world-class content on: http://thefalken.livejournal.com This email is sent for and on behalf of Halliwells LLP. Halliwells LLP is a limited liability partnership registered in England and Wales under registered number OC307980 whose registered office address is at Halliwells LLP, 3 Hardman Square, Spinningfields, Manchester, M3 3EB. A list of members is available for inspection at the registered office. Any reference to a partner in relation to Halliwells LLP means a member of Halliwells LLP. Regulated by The Solicitors Regulation Authority. CONFIDENTIALITY This email is intended only for the use of the addressee named above and may be confidential or legally privileged. If you are not the addressee you must not read it and must not use any information contained in nor copy it nor inform any person other than Halliwells LLP or the addressee of its existence or contents. If you have received this email in error please delete it and notify Halliwells LLP IT Department on 0870 365 2500. For more information about Halliwells LLP visit www.halliwells.com. -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups Links
[flexcoders] Re: Adding/Removing child components
--- In flexcoders@yahoogroups.com, Tim Hoff [EMAIL PROTECTED] wrote: Tom and Tracy both have good suggestions. However, I'd recommend using any of the List based controls, with an itemRenderer, instead of using a repeater. Unlike the Repeater component, which instantiates all objects that are repeated (no recycling), the List based controls instantiate only objects visible in the list. However, if you know that the most likely use case is that the repeater will not be showing enough items to cause scrolling, you may want to consider this: http://flexdiary.blogspot.com/2008/04/is-horizontallist-faster-than- hbox-with.html
[flexcoders] Re: Adding/Removing child components
Absolutely Amy, Or if you know that the number items will always be performance acceptable, put your list in a container and set the height of the list to measuredHeightOfItems; to ensure smooth scrolling by instantiating all of the items like a repeater. No right or wrong; just depends. -TH --- In flexcoders@yahoogroups.com, Amy [EMAIL PROTECTED] wrote: --- In flexcoders@yahoogroups.com, Tim Hoff TimHoff@ wrote: Tom and Tracy both have good suggestions. However, I'd recommend using any of the List based controls, with an itemRenderer, instead of using a repeater. Unlike the Repeater component, which instantiates all objects that are repeated (no recycling), the List based controls instantiate only objects visible in the list. However, if you know that the most likely use case is that the repeater will not be showing enough items to cause scrolling, you may want to consider this: http://flexdiary.blogspot.com/2008/04/is-horizontallist-faster-than- hbox-with.html
