B4J Question Questions about TreeTableView

Mashiane · Sep 24, 2023

Hi

A couple of questions for clarity and request for help?

Q1. How can I set a "tag" for each TreeTableItem, I see there is no way to make each TreeTableItem have a unique id?
Q2. How does one search for a TreeTableItem by "text" and return the TreeTableItem? For example Id like to use AddChild(parentID, childID, childText), where the parentID will be a unique identifier for the parent.
Q3. Is it possible to move an item up / down or right / left using code?
Q4. Is it possible to get the position of a TreeTableItem within the tree?
Q6. When having added a context menu... how do I get the TreeTableItem the mouse actioned on?

Q7. How do I delete a TreeTableItem via code?

Thank you so much in advance.

stevel05 · Sep 24, 2023

Q1. TreeItem does not have a tag implementation as it does not inherit from Node. You could keep your own Map to achieve this.
Q2. You could traverse the tree starting at root to find an item by text, or you could put that in a map as well.
Q3. Yes by removing it from it's current parent or position in the parents children and inserting it where you want it.
Q4. as Q2
Q5?
Q6. in the action call on the context menu, you can get the Source item from the Event getSource method (using JavaObject)
Q7. Remove it from it's parent.

Most of this depends on being able to identify the parent and it's position within it's parent. A Map and searching the parents items will go a long way to giving you the information you need.

Mashiane · Sep 24, 2023

Q5. When executing item adding

B4X:

tti.Initialize("", Array(childName, "A","B", "C", "D", "E"))

How do I instead pass a List variable? I want to control what is added on the array.

stevel05 · Sep 24, 2023

Q5.

You can do something like this:

B4X:

    Dim L As List
    L.Initialize
    L.Add("A")
    L.Add("B")
    L.Add("C")
    L.Add("D")
    L.Add("E")
    
    Dim TTI As TreeTableItem
    TTI.Initialize("TTi", L.As(JavaObject).RunMethod("toArray",Null))
    
    For i = 0 To L.Size - 1
        Log(TTI.GetValue(i))
    Next

Mashiane · Sep 24, 2023

So far its going well.

Move Up

Move Down

Delete

Move Left & Right

MoveLeft - add it to the previous parent.
MoveRight - make it a child of the previous item

Will make it available as a class helper as soon as Im able to finish it.

Mashiane · Sep 24, 2023

Toggling Columns

Mashiane · Sep 24, 2023

Q8. How do I get the level (how deep) of a node?

stevel05 · Sep 24, 2023

If you have the TreeItem, You can get the parent until you get to the root level.

Something like.

B4X:

Dim TTI As TreeTableItem = SourceTTI
    Dim Level As Int
    Do While TTI.Parent.Root = False
       Dim TTI As TreeTableItem = TTI.Parent
        Level = Level + 1
    Loop
   
    Log(Level)

You could also capture the parents to a list. Or put them in the Map when you build it in the first place. Although you would have to maintain that when you move the nodes about.

Mashiane · Sep 24, 2023

stevel05 said:
You could also capture the parents to a list. Or put them in the Map when you build it in the first place. Although you would have to maintain that when you move the nodes about.

I am using 2 maps inside to manage the internal structure,

I have defined a schema like this

B4X:

tv.AddItem("", "prj1", "Anele Mbanga (Mashy)", Array("A","B","C","D","E"))
    tv.AddItem("prj1", "page1", "Page 1", Array("A","B","C","D","E"))
    tv.AddItem("prj1", "page2", "Page 2", Array("A","B","C","D","E"))
    tv.AddItem("prj1", "page3", "Page 3", Array("A","B","C","D","E"))
    tv.AddItem("page1", "page4", "Page 4", Array("A","B","C","D","E"))
    tv.AddItem("page1", "page5", "Page 5", Array("A","B","C","D","E"))
    tv.AddItem("page1", "page6", "Page 6", Array("A","B","C","D","E"))
    'search

Assumptions made are : the id and name are unique, because I need to search by id and also search by name. So far its doing stufff as planned.

Thank you so much @stevel05 for the help, appreciated. I might ask a lot of other questions...

Mashiane · Sep 24, 2023

stevel05 said:
Dim TTI As TreeTableItem = TTI.Parent

Perfect, just had to remove the "dim call"

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