[flexcoders] Re: Does Drag Drop Only Update the DataProvider?
collectionChange doesn't appear to be a valid DataGrid event, but I
tried dataChanged, added, add, valueCommit, and updateComplete. None
of these did what I wanted, and actually, I have verified that the
__employees ArrayCollection does not update after a DD event.
Looking through everything in debug mode, I'm seeing that the
dataProvider of the DataGrid is updated after DD, but not the bound
variable __employees.
I wonder if it's how I declared the variable? I did it like so:
code
[Bindable]
private var __employees:ArrayCollection;
public function get employees():ArrayCollection {
return __employees;
}
public function set employees( employees:ArrayCollection ):void {
if (employees != null) {
__employees = employees;
}
}
/code
Maybe I should just make it public? Nope, that didn't work.
I'm also wondering if the event.preventDefault(); is messing
something up. Nope, that just prevents the the base class ListBase
from doing it's DD handling. Since this doesn't check for
duplicates, I don't want to use it.
I'm not sure what to do
--- In flexcoders@yahoogroups.com, Alex Harui [EMAIL PROTECTED] wrote:
Mx:DataGrid's change event is for when selection changes, not when the
collection changes. Could that be the issue? collectionChange may be
what you want.
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Friday, May 18, 2007 10:12 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
I don't have the code in front of me right now, but to be more precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to
broadcast an
event every time there is a change to the DataGrid. The dgEmployees
DataGrid has a
change event method defined, somthing like:
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
change=broadcastEvent(event)
...
/code
The broadcastEvent() method constructs a custom event containing the
number of
elements in the DataGrid, and then dispatches it to be used elsewhere.
Now, as I type this, I see that I might have keyed off the wrong event,
change. Not sure if
that is broadcast upon a change in the dataProvider, BUT I had been
working on this code
previously (converting to Flex 2.0), and I believe that I saw this same
issue.
I noticed that when I used the debugger to step throught the
doDragDrop() method, I was
seeing that only the dataProvider was being updated, and not the
ArrayCollection. I can't
verify this until Monday (5/21), but I'm almost 100% sure this is what I
saw.
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
How do you know it didn't update __employees?
Can you post a mini-example in a couple of screenfuls of text?
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Thursday, May 17, 2007 6:11 PM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Does Drag Drop Only Update the DataProvider?
I have a DataGrid that has a dataProvider bound to an ArrayCollection.
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
...
/code
I also have another DataGrid (dgAllEmployees) that is within a popup,
which I use as a source for Drag Drop operations to populate the
dgEmployee dataGrid.
What I've noticed is that when I drag drop employees from the all
employees DataGrid to the employees DataGrid, it seems to only
update the dataProvider of dgEmployees, and not the ArrayCollection
__employees. Why is this?
Below is a snip of my drag drop code where it actually copies the
data. This is a generic method that is used all over the application.
code
public static function doDragDrop( event:DragEvent ):void
{
// Prevent the default event from happening.
event.preventDefault();
// Get drop target
var dropTarget:DataGrid = DataGrid(event.currentTarget);
// Get the dragged items from the drag initiator.
var dropItems:Array = event.dragSource.dataForFormat(items) as
Array;
// Add each item to the drop target.
for (var i:uint = 0; i dropItems.length; i++)
{
var dest:IList = IList(dropTarget.dataProvider);
if (!contains(dest, dropItems[i]))
{
dest.addItem(dropItems[i]);
}
}
}
/code
I think that I had event.preventDefault(); in there because it was
putting 2 of each dropped item in the dgEmployee DataGrid. Might this
be messing something up?
Also, contains() is a custom method to compare the source items to
what's in the target's list to prevent duplicates. Is there a better
way to do this?
Thanks in advance.
GT
RE: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
collectionChange is dispatched from the collection and not the DataGrid.
Binding to private variables is not recommended, but not the problem
either.
Can you fit an entire example in two screens of text? If so, post it.
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 9:56 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
collectionChange doesn't appear to be a valid DataGrid event, but I
tried dataChanged, added, add, valueCommit, and updateComplete. None
of these did what I wanted, and actually, I have verified that the
__employees ArrayCollection does not update after a DD event.
Looking through everything in debug mode, I'm seeing that the
dataProvider of the DataGrid is updated after DD, but not the bound
variable __employees.
I wonder if it's how I declared the variable? I did it like so:
code
[Bindable]
private var __employees:ArrayCollection;
public function get employees():ArrayCollection {
return __employees;
}
public function set employees( employees:ArrayCollection ):void {
if (employees != null) {
__employees = employees;
}
}
/code
Maybe I should just make it public? Nope, that didn't work.
I'm also wondering if the event.preventDefault(); is messing
something up. Nope, that just prevents the the base class ListBase
from doing it's DD handling. Since this doesn't check for
duplicates, I don't want to use it.
I'm not sure what to do
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui [EMAIL PROTECTED] wrote:
Mx:DataGrid's change event is for when selection changes, not when the
collection changes. Could that be the issue? collectionChange may be
what you want.
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Friday, May 18, 2007 10:12 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
I don't have the code in front of me right now, but to be more
precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to
broadcast an
event every time there is a change to the DataGrid. The dgEmployees
DataGrid has a
change event method defined, somthing like:
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
change=broadcastEvent(event)
...
/code
The broadcastEvent() method constructs a custom event containing the
number of
elements in the DataGrid, and then dispatches it to be used elsewhere.
Now, as I type this, I see that I might have keyed off the wrong
event,
change. Not sure if
that is broadcast upon a change in the dataProvider, BUT I had been
working on this code
previously (converting to Flex 2.0), and I believe that I saw this
same
issue.
I noticed that when I used the debugger to step throught the
doDragDrop() method, I was
seeing that only the dataProvider was being updated, and not the
ArrayCollection. I can't
verify this until Monday (5/21), but I'm almost 100% sure this is what
I
saw.
--- In flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
How do you know it didn't update __employees?
Can you post a mini-example in a couple of screenfuls of text?
From: flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Thursday, May 17, 2007 6:11 PM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Does Drag Drop Only Update the DataProvider?
I have a DataGrid that has a dataProvider bound to an
ArrayCollection.
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
...
/code
I also have another DataGrid (dgAllEmployees) that is within a
popup,
which I use as a source for Drag Drop operations to populate the
dgEmployee dataGrid.
What I've noticed is that when I drag drop employees from the all
employees DataGrid to the employees DataGrid, it seems to only
update the dataProvider of dgEmployees, and not the ArrayCollection
__employees. Why is this?
Below is a snip of my drag drop code where it actually copies the
data. This is a generic method that is used all over the
application.
code
public static function doDragDrop( event:DragEvent ):void
{
// Prevent the default event from happening.
event.preventDefault();
// Get drop target
var dropTarget:DataGrid = DataGrid
[flexcoders] Re: Does Drag Drop Only Update the DataProvider?
Why is binding to private variables not recommended? Should I bind to
the employees pseudo property?
I figured out why it wasn't working. Binding is one way. I'm binging
the DataGrids dataProvider to the ArrayCollection, so only changes to
the ArrayCollection would effect the dataProvider. It doesn't work
the other way around (changes to the DataProvider updating the
ArrayCollection). Somehow I seemed to have forgotten that fact.
--- In flexcoders@yahoogroups.com, Alex Harui [EMAIL PROTECTED] wrote:
collectionChange is dispatched from the collection and not the DataGrid.
Binding to private variables is not recommended, but not the problem
either.
Can you fit an entire example in two screens of text? If so, post it.
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 9:56 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
collectionChange doesn't appear to be a valid DataGrid event, but I
tried dataChanged, added, add, valueCommit, and updateComplete. None
of these did what I wanted, and actually, I have verified that the
__employees ArrayCollection does not update after a DD event.
Looking through everything in debug mode, I'm seeing that the
dataProvider of the DataGrid is updated after DD, but not the bound
variable __employees.
I wonder if it's how I declared the variable? I did it like so:
code
[Bindable]
private var __employees:ArrayCollection;
public function get employees():ArrayCollection {
return __employees;
}
public function set employees( employees:ArrayCollection ):void {
if (employees != null) {
__employees = employees;
}
}
/code
Maybe I should just make it public? Nope, that didn't work.
I'm also wondering if the event.preventDefault(); is messing
something up. Nope, that just prevents the the base class ListBase
from doing it's DD handling. Since this doesn't check for
duplicates, I don't want to use it.
I'm not sure what to do
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
Mx:DataGrid's change event is for when selection changes, not when the
collection changes. Could that be the issue? collectionChange may be
what you want.
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Friday, May 18, 2007 10:12 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
I don't have the code in front of me right now, but to be more
precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to
broadcast an
event every time there is a change to the DataGrid. The dgEmployees
DataGrid has a
change event method defined, somthing like:
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
change=broadcastEvent(event)
...
/code
The broadcastEvent() method constructs a custom event containing the
number of
elements in the DataGrid, and then dispatches it to be used elsewhere.
Now, as I type this, I see that I might have keyed off the wrong
event,
change. Not sure if
that is broadcast upon a change in the dataProvider, BUT I had been
working on this code
previously (converting to Flex 2.0), and I believe that I saw this
same
issue.
I noticed that when I used the debugger to step throught the
doDragDrop() method, I was
seeing that only the dataProvider was being updated, and not the
ArrayCollection. I can't
verify this until Monday (5/21), but I'm almost 100% sure this is what
I
saw.
--- In flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
How do you know it didn't update __employees?
Can you post a mini-example in a couple of screenfuls of text?
From: flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Thursday, May 17, 2007 6:11 PM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Does Drag Drop Only Update the DataProvider?
I have a DataGrid that has a dataProvider bound to an
ArrayCollection.
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
...
/code
I also have another DataGrid (dgAllEmployees) that is within a
popup,
which I use
RE: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
Binding just converts a variable into a property by wrapping in function
get/set. The best practice to dispatch an event from the setter and
declare the event name in the [Bindable] metadata.
I thought there was a warning for binding to private, but maybe we got
around it somehow.
Binding is one way, but if the dg is bound to employees, the underlying
array that got passed into the ArrayCollection should get modified when
you drop into the dg.
-Alex
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 2:41 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
Why is binding to private variables not recommended? Should I bind to
the employees pseudo property?
I figured out why it wasn't working. Binding is one way. I'm binging
the DataGrids dataProvider to the ArrayCollection, so only changes to
the ArrayCollection would effect the dataProvider. It doesn't work
the other way around (changes to the DataProvider updating the
ArrayCollection). Somehow I seemed to have forgotten that fact.
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui [EMAIL PROTECTED] wrote:
collectionChange is dispatched from the collection and not the
DataGrid.
Binding to private variables is not recommended, but not the problem
either.
Can you fit an entire example in two screens of text? If so, post it.
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 9:56 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
collectionChange doesn't appear to be a valid DataGrid event, but I
tried dataChanged, added, add, valueCommit, and updateComplete. None
of these did what I wanted, and actually, I have verified that the
__employees ArrayCollection does not update after a DD event.
Looking through everything in debug mode, I'm seeing that the
dataProvider of the DataGrid is updated after DD, but not the bound
variable __employees.
I wonder if it's how I declared the variable? I did it like so:
code
[Bindable]
private var __employees:ArrayCollection;
public function get employees():ArrayCollection {
return __employees;
}
public function set employees( employees:ArrayCollection ):void {
if (employees != null) {
__employees = employees;
}
}
/code
Maybe I should just make it public? Nope, that didn't work.
I'm also wondering if the event.preventDefault(); is messing
something up. Nope, that just prevents the the base class ListBase
from doing it's DD handling. Since this doesn't check for
duplicates, I don't want to use it.
I'm not sure what to do
--- In flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
Mx:DataGrid's change event is for when selection changes, not when
the
collection changes. Could that be the issue? collectionChange may be
what you want.
From: flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Friday, May 18, 2007 10:12 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
I don't have the code in front of me right now, but to be more
precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to
broadcast an
event every time there is a change to the DataGrid. The dgEmployees
DataGrid has a
change event method defined, somthing like:
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
change=broadcastEvent(event)
...
/code
The broadcastEvent() method constructs a custom event containing the
number of
elements in the DataGrid, and then dispatches it to be used
elsewhere.
Now, as I type this, I see that I might have keyed off the wrong
event,
change. Not sure if
that is broadcast upon a change in the dataProvider, BUT I had been
working on this code
previously (converting to Flex 2.0), and I believe that I saw this
same
issue.
I noticed that when I used the debugger to step throught the
doDragDrop() method, I was
seeing that only the dataProvider was being updated, and not the
ArrayCollection. I can't
verify this until Monday (5/21), but I'm almost 100% sure this is
what
I
saw.
--- In flexcoders@yahoogroups.com
[flexcoders] Re: Does Drag Drop Only Update the DataProvider?
I read (Migrating Applications to Flex 2 by Adobe, page 108) that if
you have private variables with getter/setter, you can omit the event
name as the compiler would automatically generate an event named
propertyChanged. What that example shows that I didn't do is it put
the [Bindable] metadata tag before the getter method, not the variable
declaration. I'll change that in the future.
Regarding your last statement, I would like to think that the bound
ArrayCollection would update if you specifically update the
dataProvider of the DataGrid, but according to what I'm seeing in the
debugger, that isn't the case. I wish it were... It would've made my
life a lot easier.
BTW, thanks for your help.
--- In flexcoders@yahoogroups.com, Alex Harui [EMAIL PROTECTED] wrote:
Binding just converts a variable into a property by wrapping in function
get/set. The best practice to dispatch an event from the setter and
declare the event name in the [Bindable] metadata.
I thought there was a warning for binding to private, but maybe we got
around it somehow.
Binding is one way, but if the dg is bound to employees, the underlying
array that got passed into the ArrayCollection should get modified when
you drop into the dg.
-Alex
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 2:41 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
Why is binding to private variables not recommended? Should I bind to
the employees pseudo property?
I figured out why it wasn't working. Binding is one way. I'm binging
the DataGrids dataProvider to the ArrayCollection, so only changes to
the ArrayCollection would effect the dataProvider. It doesn't work
the other way around (changes to the DataProvider updating the
ArrayCollection). Somehow I seemed to have forgotten that fact.
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
collectionChange is dispatched from the collection and not the
DataGrid.
Binding to private variables is not recommended, but not the problem
either.
Can you fit an entire example in two screens of text? If so, post it.
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 9:56 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
collectionChange doesn't appear to be a valid DataGrid event, but I
tried dataChanged, added, add, valueCommit, and updateComplete. None
of these did what I wanted, and actually, I have verified that the
__employees ArrayCollection does not update after a DD event.
Looking through everything in debug mode, I'm seeing that the
dataProvider of the DataGrid is updated after DD, but not the bound
variable __employees.
I wonder if it's how I declared the variable? I did it like so:
code
[Bindable]
private var __employees:ArrayCollection;
public function get employees():ArrayCollection {
return __employees;
}
public function set employees( employees:ArrayCollection ):void {
if (employees != null) {
__employees = employees;
}
}
/code
Maybe I should just make it public? Nope, that didn't work.
I'm also wondering if the event.preventDefault(); is messing
something up. Nope, that just prevents the the base class ListBase
from doing it's DD handling. Since this doesn't check for
duplicates, I don't want to use it.
I'm not sure what to do
--- In flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
Mx:DataGrid's change event is for when selection changes, not when
the
collection changes. Could that be the issue? collectionChange may be
what you want.
From: flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Friday, May 18, 2007 10:12 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
I don't have the code in front of me right now, but to be more
precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to
broadcast an
event every time there is a change to the DataGrid. The dgEmployees
DataGrid has a
change
RE: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
There are two common bindable patterns:
[Bindable]
public var foo
And
[Bindable(someEvent)]
public function get foo():...
public function set foo(value:...)
{
_foo = value;
dispatchEvent(new Event(someEvent));
}
Otherwise, in your case you ended up generating two levels of get/set
functions which is unnecessary.
Feel free to post a mini-example of the DG update issue. Then we'll
know for sure.
-Alex
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 4:08 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
I read (Migrating Applications to Flex 2 by Adobe, page 108) that if
you have private variables with getter/setter, you can omit the event
name as the compiler would automatically generate an event named
propertyChanged. What that example shows that I didn't do is it put
the [Bindable] metadata tag before the getter method, not the variable
declaration. I'll change that in the future.
Regarding your last statement, I would like to think that the bound
ArrayCollection would update if you specifically update the
dataProvider of the DataGrid, but according to what I'm seeing in the
debugger, that isn't the case. I wish it were... It would've made my
life a lot easier.
BTW, thanks for your help.
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui [EMAIL PROTECTED] wrote:
Binding just converts a variable into a property by wrapping in
function
get/set. The best practice to dispatch an event from the setter and
declare the event name in the [Bindable] metadata.
I thought there was a warning for binding to private, but maybe we got
around it somehow.
Binding is one way, but if the dg is bound to employees, the
underlying
array that got passed into the ArrayCollection should get modified
when
you drop into the dg.
-Alex
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 2:41 PM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
Why is binding to private variables not recommended? Should I bind to
the employees pseudo property?
I figured out why it wasn't working. Binding is one way. I'm binging
the DataGrids dataProvider to the ArrayCollection, so only changes to
the ArrayCollection would effect the dataProvider. It doesn't work
the other way around (changes to the DataProvider updating the
ArrayCollection). Somehow I seemed to have forgotten that fact.
--- In flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
, Alex Harui aharui@ wrote:
collectionChange is dispatched from the collection and not the
DataGrid.
Binding to private variables is not recommended, but not the problem
either.
Can you fit an entire example in two screens of text? If so, post
it.
From: flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Monday, May 21, 2007 9:56 AM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the
DataProvider?
collectionChange doesn't appear to be a valid DataGrid event, but I
tried dataChanged, added, add, valueCommit, and updateComplete. None
of these did what I wanted, and actually, I have verified that the
__employees ArrayCollection does not update after a DD event.
Looking through everything in debug mode, I'm seeing that the
dataProvider of the DataGrid is updated after DD, but not the bound
variable __employees.
I wonder if it's how I declared the variable? I did it like so:
code
[Bindable]
private var __employees:ArrayCollection;
public function get employees():ArrayCollection {
return __employees;
}
public function set employees( employees:ArrayCollection ):void {
if (employees != null) {
__employees = employees;
}
}
/code
Maybe I should just make it public? Nope, that didn't work.
I'm also wondering if the event.preventDefault(); is messing
something up. Nope, that just prevents the the base class ListBase
from doing it's DD handling. Since this doesn't check for
duplicates, I don't want to use it.
I'm not sure what to do
--- In flexcoders@yahoogroups.com
mailto:flexcoders%40yahoogroups.com
mailto:flexcoders%40yahoogroups.com
[flexcoders] Re: Does Drag Drop Only Update the DataProvider?
I don't have the code in front of me right now, but to be more precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to broadcast
an
event every time there is a change to the DataGrid. The dgEmployees DataGrid
has a
change event method defined, somthing like:
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
change=broadcastEvent(event)
...
/code
The broadcastEvent() method constructs a custom event containing the number of
elements in the DataGrid, and then dispatches it to be used elsewhere.
Now, as I type this, I see that I might have keyed off the wrong event,
change. Not sure if
that is broadcast upon a change in the dataProvider, BUT I had been working on
this code
previously (converting to Flex 2.0), and I believe that I saw this same issue.
I noticed that when I used the debugger to step throught the doDragDrop()
method, I was
seeing that only the dataProvider was being updated, and not the
ArrayCollection. I can't
verify this until Monday (5/21), but I'm almost 100% sure this is what I saw.
--- In flexcoders@yahoogroups.com, Alex Harui [EMAIL PROTECTED] wrote:
How do you know it didn't update __employees?
Can you post a mini-example in a couple of screenfuls of text?
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Thursday, May 17, 2007 6:11 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Does Drag Drop Only Update the DataProvider?
I have a DataGrid that has a dataProvider bound to an ArrayCollection.
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
...
/code
I also have another DataGrid (dgAllEmployees) that is within a popup,
which I use as a source for Drag Drop operations to populate the
dgEmployee dataGrid.
What I've noticed is that when I drag drop employees from the all
employees DataGrid to the employees DataGrid, it seems to only
update the dataProvider of dgEmployees, and not the ArrayCollection
__employees. Why is this?
Below is a snip of my drag drop code where it actually copies the
data. This is a generic method that is used all over the application.
code
public static function doDragDrop( event:DragEvent ):void
{
// Prevent the default event from happening.
event.preventDefault();
// Get drop target
var dropTarget:DataGrid = DataGrid(event.currentTarget);
// Get the dragged items from the drag initiator.
var dropItems:Array = event.dragSource.dataForFormat(items) as Array;
// Add each item to the drop target.
for (var i:uint = 0; i dropItems.length; i++)
{
var dest:IList = IList(dropTarget.dataProvider);
if (!contains(dest, dropItems[i]))
{
dest.addItem(dropItems[i]);
}
}
}
/code
I think that I had event.preventDefault(); in there because it was
putting 2 of each dropped item in the dgEmployee DataGrid. Might this
be messing something up?
Also, contains() is a custom method to compare the source items to
what's in the target's list to prevent duplicates. Is there a better
way to do this?
Thanks in advance.
GT
RE: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
Mx:DataGrid's change event is for when selection changes, not when the
collection changes. Could that be the issue? collectionChange may be
what you want.
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Geoffrey
Sent: Friday, May 18, 2007 10:12 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Does Drag Drop Only Update the DataProvider?
I don't have the code in front of me right now, but to be more precise,
dgEmployees is not
broadcasting a change event upon a DD action. I want dgEmployees to
broadcast an
event every time there is a change to the DataGrid. The dgEmployees
DataGrid has a
change event method defined, somthing like:
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
change=broadcastEvent(event)
...
/code
The broadcastEvent() method constructs a custom event containing the
number of
elements in the DataGrid, and then dispatches it to be used elsewhere.
Now, as I type this, I see that I might have keyed off the wrong event,
change. Not sure if
that is broadcast upon a change in the dataProvider, BUT I had been
working on this code
previously (converting to Flex 2.0), and I believe that I saw this same
issue.
I noticed that when I used the debugger to step throught the
doDragDrop() method, I was
seeing that only the dataProvider was being updated, and not the
ArrayCollection. I can't
verify this until Monday (5/21), but I'm almost 100% sure this is what I
saw.
--- In flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
, Alex Harui [EMAIL PROTECTED] wrote:
How do you know it didn't update __employees?
Can you post a mini-example in a couple of screenfuls of text?
From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
[mailto:flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
] On
Behalf Of Geoffrey
Sent: Thursday, May 17, 2007 6:11 PM
To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
Subject: [flexcoders] Does Drag Drop Only Update the DataProvider?
I have a DataGrid that has a dataProvider bound to an ArrayCollection.
code
mx:DataGrid id=dgEmployees
dataProvider={__employees}
...
/code
I also have another DataGrid (dgAllEmployees) that is within a popup,
which I use as a source for Drag Drop operations to populate the
dgEmployee dataGrid.
What I've noticed is that when I drag drop employees from the all
employees DataGrid to the employees DataGrid, it seems to only
update the dataProvider of dgEmployees, and not the ArrayCollection
__employees. Why is this?
Below is a snip of my drag drop code where it actually copies the
data. This is a generic method that is used all over the application.
code
public static function doDragDrop( event:DragEvent ):void
{
// Prevent the default event from happening.
event.preventDefault();
// Get drop target
var dropTarget:DataGrid = DataGrid(event.currentTarget);
// Get the dragged items from the drag initiator.
var dropItems:Array = event.dragSource.dataForFormat(items) as
Array;
// Add each item to the drop target.
for (var i:uint = 0; i dropItems.length; i++)
{
var dest:IList = IList(dropTarget.dataProvider);
if (!contains(dest, dropItems[i]))
{
dest.addItem(dropItems[i]);
}
}
}
/code
I think that I had event.preventDefault(); in there because it was
putting 2 of each dropped item in the dgEmployee DataGrid. Might this
be messing something up?
Also, contains() is a custom method to compare the source items to
what's in the target's list to prevent duplicates. Is there a better
way to do this?
Thanks in advance.
GT
