Tree Control Highlighting Programmatically Selected Item

Does anyone know whether it is possible to highlight a programmatically selected item in the LV Tree Control, eg I have used the "Get Child" method to select an item - how do I then highlight this item on the tree?

Yes, you can write the value to a local variable for the tree control. This will have the effect of selecting the item--which will highlight just ike the user clicked on it.
By the way, "Get Child" doesn't select an item in any sort of useful sense--it just tells you what the child is. Actually, it tells you what the first child under the indicated Parent is.
Mike...
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Similar Messages

Tree control: How to disable the selection of a child item

Hello everyone,
Im having trouble with disabling the selection of a child item in a tree control. I dont know if its possible but havent found any answers on this forum regarding this issue.
Example:
Parent tag 1
    child item 1
    child item 2
Parent tag 2
    child item a
    child item b
What i would like to do is being able to select the parent tags but not the child items, because i use the name of the selected item in my program to determine which actions are allowed and those that are not. To avoid this problem i look at the first 4 letters of the name and this way i can determine if it is a parent tag or child item and take appropriate action. Im able to do this because the parent tags have fixed names. But even though nothing happens in software if i select a child item it still lights up, so for the user of the program it looks as if the child items is selected but the program doesnt do anything(because i made it that way). Thats why i want to be able to disable the selection of the child item or at least make the selection colour of the child item transparant so it doesnt look like it is selected.
Can anyone help me with this problem, if there are parts of my question you dont understand, just ask.
greetz
Ynse.

Muks,
your last image disables the whole tree.
To programmatically disables an item use ActiveItem.Disabled? property.
Unfortunately this only has two states, Enabled and disabled (thus grayed).
Ton
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ViewStack programmatically changing selected item

Hi Guys or Ladies
New to flex and here is my scenario:
Using a ViewStack that has multipule custom componentes (forms) in it.
I have a diffrent navigation control that when clicked should preform two simple tasks.
1. Change the viewstack selected item according to the clicked item in the navigation control.
2. Bind Specific data to the inner custom component in the viewstack that should be set to selected already.
Sounds simple ... but for some reason unknown to me.
After I set the viewstack selectedchild to the right custom component
when I try to bind my data to that component I see that the change in the viewstack has occurred yet
and the component is still null;
Here is the code.
private function NavigationControl_ItemClick(event:MyCustomEvent):void{
//change viewstack selectedChild
MyViewStack.selectedChild = ThisSpecificComponent;
//Bind Data to the new created instance of component in the viewstack
ThisSpecificComponent.data = event.data;
Thanks

Set components creationPolicy value to "All" This property initialize all components inside the container, so you dont get null object reference.

JComboBox selection and highlight problem of the selected item

Hi,
I have a question how can I make my newly added item to the combo-box selectable and highlighted. I am adding new items to my custom comboBox dynamically and I want whatever item I add to be selected by default. I am using my own custom ComboBoxModel that extends AbstractListModel and implements ComboBoxModel and TreeModelListener, and my custom Renderer that extends JLabel and implements ListCellRenderer. Because I am trying to get a tree structure in my comboBox model and that's why I have my own custom model and renderer. Now when I add a new node or item to my comboBox it is being added and shown in the combo-box textField, but as soon I pull down the combo-box my parent directory is selected though my current selection is the last node added. That's how I am adding new nodes and making it selectable
treeModel.insertNodeInto(tempNode, (DefaultMutableTreeNode)nodeCollection.lastElement(), 0);
int nodeTotal =((CMRGlobals.myTreeGlobals).getModel()).getSize();
Object lastNode = CMRGlobals.myTreeGlobals).getModel()).getElementAt(nodeTotal - 1);
((CMRGlobals.myTreeGlobals).getModel()).setSelectedItem(lastNode);
when I do this my node is added under my parentNode and is shown in the comboBox but when I try to pull down the combo my parent node is high lighted and when I move out of the combo-box my parent node gets selected and show in the combo-box though I haven't selected it,and the contents of my last node are shown. I am just writing my own custom model that simulates the effect of JTree. I am using these......
DefaultMutableTreeNode and
DefaultTreeModel
and in my JComboBox I am setting my model as
this.setModel(new myModel(treemodel));
this.setRenderer(new myRenderer());
I am building my own FileDialog that just works like FileDialog I have all the functionality except this problem.Thanks for any help. I know I have posted this same thread yesterday but I didn't get any response hoping now may somebody can help me.Thanks again

never mind I got it
Thanks

Tlist & tree controls - highlight colour

Does anyone know if/how we can influence the colour used to highlight a row in a tree/t-list.
Is it configurable or are we stuck with whatever the colour scheme gives us?
Thanks,
Bren

you can change the color via visual attribute - for the whole item
in the tlist you can't change the colors between the values of the tlist... That's impossible in native Oracle Forms.
Maybe a PJC helps you in that case

How to get access to Row Data (Child Text) in a Tree Control Pragmatically?

In LabVIEW 2010, I have entered Row Data into a Tree Control pragmatically using the Add Item method and providing the Child Text array and the Child Tag for the Row. When a Row in the Tree Control is selected, I can get the Row Tag in the Value Property of the Tree. But how do I access the Child Text array data when the Row is selected? I can't seem to find a Tree Control Property or Method that will return that data back again.
What I am trying to do is: once a Row in a Tree is selected and a button is pushed, if the Row Tag is valid, I want to transfer all of the Row data into another similarly formatted Tree. To do that I need the Row Data for the Tree and Row that was selected. I can not find a way to get access to this Row Data after it has been entered into the Tree.
Can anyone tell me how to pragmatically access the Child Text or Row Data in a Tree Control from a selected Row in the Tree? I have the Tag for the Row, but how do I access the data?
Thanks for your assistance.
Solved!
Go to Solution.

As mentioned in the posting here, you can use the Active Item:Tag property to set the item to which subsequent property changes apply. This includes pulling the Active Celltring values out in a for loop as you increment the Active Cell:Active Column Number to get the row's Child Text data programmatically as I was originally wanting to do.
Note that wiring a 0 to the ActiveColNum property and reading the String value will return the tree item's visible name (in column 0), but not the unique item Tag (which is somewhat intangible after its creation). Therefore, I save the unique item tag when I add the item to the tree control (the output of the Add Item invoke node) and store it as a separate column of the Child Text array and place it out of sight in the tree control so I have access to it later. It might be useful, it might not.
I find the tree control totally non-intuitive and not well explained anywhere, but that's how a lot of LabVIEW coding is I guess. Play with it long enough and you become an expert. I had to learn the hard way, but I hope this helps someone else.
-Richard
"Computers are useless. They can only give you answers." - Pablo Picasso

How to highlight all child items in a tree control?

I have a tree control and a boolean button. I want to use the button to select all (highlight) the child items in the tree control. I've seen CVI functions where you can set the active items, but such a function/method does not appear in LabVIEW.
Any clues?

Hi settles,
Once you have all the children, you just need to set the value of the tree control to be an array of all the child tags. Here's a screenshot of a VI that does this:
First I get all the tags, then I get the parent of each tag. If the parent is a non-empty string, I add it to an array. Then I write that array value to a local variable of the tree control. Let me know if you have any questions on this method. I believe the "All Tags" property I'm using was added in LabVIEW 8.0.
-D
Message Edited by Darren on 08-20-2008 10:58 AM
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman
Attachments:
select_all_children_in_tree.PNG ‏34 KB

State Change causing tree item to loss selected item highlight

I'm looking for some guidance on a situation i'm encountering. I've an application with a tree component which will be used as a report selector in all view states. The parent nodes are not selectable but the children are. Each child has a for a lack of a better term parameter classification. When a report item is selected in the tree then a state change occurs and displays the appropriate parameter selection view.
My issue is this. Upon clicking an item and displaying the new state for the first time, the selected item in the tree losses the visual representation or highlight around the selected item. But within the debugger it still shows which item is the selectedItem. Once the state has been displayed at least once...i.e. I select other items and then eventually back to initial tree item when the state changes it does not loss the highlight on the selected tree item.
Couple things I've tried to see if i'm in the right neck of the woods is use the currentStateChange and currentStateChanging handlers to do a bit of tracing and found that the tree item remains selected all the way through both currentStateChanging and then even in the currentStateChange...the redraw occurs just after which is when the tree item losses its highlight.
Does anyone have any ideas or even encounter this?

Good question. Well you're right in asking. Just using a spark Label to show me the label of the selectedItem, upon the first time I click on the selection nothing populates the label's text BUT the state changes as its suppose to. Took me clicking on it a second time to get the item to be highlighted and the label to show me what had been selected.
My question here is...is there another event which is occurring after the changeState?

LabVIEW 7 Tree Control - Selected Item

Hi,
Has anyone tried the new Tree control in LV7 yet? I can't seem to find a method to programatically determine what item in the tree has been selected by the user other than if the user has double clicked on the tree - can someone point me to the method? From a user interface perspective double clicking an item in a tree shouldn't be the only way to select an item and as a side effect double clicking on the LV7 tree item closes a branch if there are children under the node double clicked on, which is very undesirable when only selecting an item.
Cheers,
Wayne

WPS,
The tree control's data, which is available from its terminal, is the tag(s) of the selected item(s).
-Jim

Tree control - How to get the full path of selected Item in tree control

I am Flex newbie. When the user clicks the particular item in
the tree control I just wanted to get it name along with it's full
parent.
Here is my XML
var dirXML:XML=<root basename="/home/tcegrid">
<Directories>
<Dir Name=".autosave" />
<Dir Name=".emacs.d" />
<Dir Name="AnsysDistributed">
<Dir Name="opt"/>
<Dir Name="root" />
</Dir>
<Dir Name="postgres"/>
<Dir Name="FineTurbo"/>
<Directories>
</root>
The above XML is data provider for Tree control. When the
user clicks the Dir Name called opt. I wanted it absolute path in
XML. say Directories.Dir.Dir.@Name is opt
Can any one tell me how to get this?

"Thamizhannal" <[email protected]> wrote in
message
news:gam9q8$4es$[email protected]..
>I am Flex newbie. When the user clicks the particular
item in the tree
>control
> I just wanted to get it name along with it's full
parent.
> Here is my XML
> var dirXML:XML=<root basename="/home/tcegrid">
> <Directories>
> <Dir Name=".autosave" />
> <Dir Name=".emacs.d" />
> <Dir Name="AnsysDistributed">
> <Dir Name="opt"/>
> <Dir Name="root" />
> </Dir>
> <Dir Name="postgres"/>
> <Dir Name="FineTurbo"/>
> <Directories>
> </root>
>
> The above XML is data provider for Tree control. When
the user clicks the
> Dir
> Name called opt. I wanted it absolute path in XML. say
> Directories.Dir.Dir.@Name is opt
> Can any one tell me how to get this?
loop until the parent() property of the XML node is empty.
HTH;
Amy

How can I display and change built-in symbols of a tree control programmatically?

I want to set the built-in symbols of a tree control during runtime.
I only found an example to assign custom pictures but not how to select one of the 40 built-in symbol.
Many Thanks
Solved!
Go to Solution.

The ActiveItem.SymbolIndex will allow you to select the symbol for the active item. You can use the ListBox Symbol Ring Constant (Dialog and User Interface palette) to select a symbol (or you can just enter the number directly if you know what it is).
Message Edited by smercurio_fc on 07-10-2008 09:36 AM
Attachments:
Example_VI_BD6.png ‏2 KB

How can I drag and drop an item from one Tree control to another in LabVIEW 7.1?

You can use the mouse up and down event on the two tree controls but the problem is making the correct selection in the second tree control. I want to be able to switch over to the selection bar of the second tree control so that I can place my item in the correct position. I know all possible workarounds with double-clicks and so on... but I really want a windows drag and drop.
This is what I have for the moment. Please check the library below. I need to activate the selection bar of the second tree control somehow to get the position in the control. The VI below is written in LV 7.1
Attachments:
Drag&Drop.llb ‏65 KB

Hi Jones,
As far as I know this feature is currently not supported by the Tree control. A workaround, would be to use the vertical position of the mouse in the button up event to determine what line you�re dropping the item.
If you would like the Tree control to include the drag and drop feature, please submit this as a Product Suggestion under the feedback at www.ni.com/contact.
Good luck!
Best regards,
Philip C.
Applications Engineer
National Instruments
www.ni.com/ask
- Philip Courtois, Thinkbot Solutions

How do I get the tag of a selected line in a tree control ?

I am running LabVIEW 7.1.
I want to be able to add a parent or sibling to a tree to a selected item in a tree.

The tag of the selected item is actually the output of the tree control itself. If you create an indicator from the tree control, you will get a duplicate tree control (indicator), but if you wire the output into a string indicator, the tag of the selected item will show up. You can an item to the tree by wiring the tree reference into an invoke node, calling the method "Edit Tree Items: Add Item", and wiring the output of the tree control (which will be the tag of the selected item) into the "Parent Tag" terminal. This method will only let you add a child to an item, you cannot add a parent or sibling. Items cannot have multiple parents, so it wouldn't make sense to add a parent; and to add a sibling for the selected item, you could call the method "Navigate Tree: Get Parent" and pass the tag of the parent into the "Edit Tree Items: Add Item" method.
Robert Mortensen
Software Engineer
National Instruments

Items in Tree control move around when data is submitted using custom ItemRenderer

I'm working on a Tree control with an XMLListCollection as
its dataProvider.
The dataProvider has information looking like this :
quote:
<?xml version='1.0' encoding='utf-8'?>
<INFO>
<FIELD label="STR_USER_NAME"
type="text"
value=""
>
</FIELD>
<FIELD label="STR_USER_EMAIL"
type="text"
value=""
>
</FIELD>
<FIELD label="STR_OPTIONAL"
type="branch"
value="0"
>
<FIELD label="STR_USER_ADDRESS"
type="text"
value=""
>
</FIELD>
<FIELD label="STR_USER_POSTAL_CODE"
type="text"
value=""
>
</FIELD>
</FIELD>
</INFO>
So in the Tree control I'd like the information to show up
with a label and
an
editable textbox for each item :
[Label] [textbox]
To do this I made a tree like this :
quote:
<mx:Tree id="userTree"
editable="true"
rendererIsEditor="true"
editorDataField="curVal"
itemRenderer="{new ClassFactory(ItemRendererUser)}"
itemEditEnd="e_ProcessData(event);"
dataDescriptor="{new DataDescriptorUsers()}"
showRoot="false"
verticalScrollPolicy="{ScrollPolicy.AUTO}"
/>
where the e_ProcessData() function looks like this (I used
http://livedocs.adobe.com/flex/201/html/wwhelp/wwhimpl/js/html/wwhelp.htm?href=c
elleditor_073_16.html#202105 as a guide) :
quote:
public function e_ProcessData(event:ListEvent):void
event.preventDefault();
userTree.editedItemRenderer.data.@value =
ItemRendererUsers(event.currentTarget.itemEditorInstance).curVal;
userTree.destroyItemEditor();
userTree.dataProvider.notifyItemUpdate(userTree.editedItemRenderer);
} // END OF e_ProcessData()
I attached the rest of the files because they're a little
bit longer.
When I run the program, the data shows up fine when it is
initialized the
very
first time, and I made a test button that just dumps the
contents of the
dataProvider in a trace statement to verify that the data has
been set
properly.
The problem I've run into is whenever the textfield is
edited, the item
that
I've selected jumps around the list.
For example, if I edit the item "STR_USER_NAME" after I
finish the edit, it
will move from the very first position in the Tree to the
bottom of the
Tree.
I traced the contents of the dataProvider and the
dataProvider structure
stays
the same, with the "STR_USER_NAME" at the top, but if I look
at the flex app
in
the web browser, its position is at the bottom of the Tree.
This happens for every other item I try to edit... I read in
the
documentation
that the ItemRenderers are recycled, so it means I should be
checking to
make
sure the initial states are covered, but I'm not sure how
this affects my
application.
Can anyone help me out with this ? Its very confusing - I've
tried making
an
ItemRenderer using pure actionscript, mxml and the
combination you see in
this
example and I always end up with the same behaviour - So I
must be missing
something critical...
// ItemRendererUsers.mxml
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="
http://www.adobe.com/2006/mxml"
verticalScrollPolicy="{ScrollPolicy.OFF}"
horizontalScrollPolicy="{ScrollPolicy.OFF}"
creationComplete="initItemRendererUsers();"
>
From my FAQ:
Q: I've created a custom itemRenderer component to use in a
List
based component (Datagrid, TileList, HorizontalList, etc.).
When my List
first displays, everything looks fine, but when I scroll it
or change the
dataProvider, some of the itemRenderers show values or
formatting that
aren't right. How do I fix this?
A: List-based components don't draw a renderer for every item
in the
dataProvider. Instead, they create enough to display what is
on screen now,
plus one or two more waiting in the wings. This means they
recycle the
renderers rather than creating new ones when you change
dataProvider or
scroll up and down. When you use a creationComplete event to
set up the
itemRenderer, that event doesn't happen again when the
renderer is used for
a different set of data. The solution to this is to override
the set data
protected function that most components have.
For more information, check out the following resources:
http://www.adobe.com/devnet/flex/articles/itemrenderers_pt1.html?devcon=f1
http://blogs.adobe.com/aharui/2007/03/thinking_about_item_renderers_1.html
Please note, I post this FAQ weekly, and you can find a
permanent copy of it
here
http://www.magnoliamultimedia.com/flex_examples/Amys_Flex_FAQ.pdf

"peterh8234" <[email protected]> wrote in
message
news:gaqttd$kft$[email protected]..
> Yes - the set and get functions are listed down below.
But the quirky
> behaviour
> is the same regardless of whether I override the set and
get functions or
> not.
>
> I noticed there was another variable called listData -
should I be using
> that
> one or the data variable to read and write to the
dataProvider ?
>
> // _data
> [Bindable] public var _data:Object;
> [Bindable("dataChange")]
> //
> override public function get data():Object
> {
> trace('[ItemRendererDefault.GET data()] called for {' +
> _data.attribute("label") + '}.');
> return _data;
> } // END OF get data()
>
> //
> override public function set data(value:Object):void
> {
> _data.@value = inputText.text;
> trace('[ItemRendererDefault.SET data()] called for {' +
> _data.attribute("label") + '}.');
>
> invalidateProperties();
> } // END OF set data()
Your set data needs to set a flag that gets picked up in
commitProperties()
and does your thing that you were doing before in
creationComplete. You
should see examples of this in the links I posted. Instead of
this:
_data.@value = inputText.text;
you should look at implementing IDropInListItemRenderer,
which will allow
you to dynamically determine which field to look at, instead
of hardcoding
it. You also might wind up overwriting the stored value with
a null value
when the List passes the stored value in. I'd encourage you
to really go
through those links I posted and make sure you understand
what they're
saying. The itemRenderer life cycle is one of the hardest
things to
understand, but once you understand it, it makes many things
in Flex much
easier. It's worth investing the time.

Save selected node in Tree control

I'm making this flex form for my school to add a new student
to the DB. When the admin clicks on a button it will open a Tree
control that displays the available courses and sections in the
following heirarchy:
Year>Semester>Course Name>Sections
Now I want that when he clicks on the button Select within
this new window showing the Tree, it will store the current
selected node and the full path to it, so that back in the original
form it will display the Year, Semester, Course name and section.
I've tried using the value and selecteditem methods from the tree
control but they are not working. Any ideas to figure out the full
path of the selected item?

You will need to climb back up the ancestor nodes to build
that path yourself.
"parent()" i believe returns the parent of the current node.
Tracy

Tree Control Highlighti​ng Programmat​ically Selected Item

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Tree Control Highlighting Programmatically Selected Item