Wish [SOLVED] TableView - Column_Resized event

[LucaMs]

TableView - Column_Resized event.


[Unfortunately I see that it is not a B4Xlib; and now how do i solve this problem? It is an event that is indispensable to me... now ]

 

[LucaMs]

Found this one, only now:

I want to create text boxes above the header of the grid to be used as a filter boxes and match the width of the columns even when they are resized

I have the same need.

 

[LucaMs]

There is no other solution than to prevent the columns from being resized - and to throw away all the code written to save their widths as user settings.
And I still don't even know if there is a way to prevent column resizing

 

[LucaMs]

And I still don't even know if there is a way to prevent column resizing

https://www.b4x.com/android/forum/threads/implement-tableview-column-resize.49757/post-310809

now how to prevent the columns reorder...

 

[stevel05]

Try this:

Private Sub SetColumnListeners
    Dim jo As JavaObject = TableView1
    Dim ColumnList As List = jo.RunMethodJO("getColumns", Null)
    
    For Each Col As JavaObject In ColumnList
        Dim Prop As JavaObject = Col.RunMethod("widthProperty",Null)
        Dim o As Object = Prop.CreateEventFromUI("javafx.beans.value.ChangeListener","ColumnChanged",Null)
        Prop.RunMethod("addListener",Array(o))
    Next
End Sub

Private Sub ColumnChanged_Event (MethodName As String, Args() As Object) As Object
    Dim Col As JavaObject = Sender
    Dim jo As JavaObject = TableView1
    Dim ColumnList As List = jo.RunMethodJO("getColumns", Null)
    Dim Width As Double = Args(2)
    Dim ColNum As Int = ColumnList.IndexOf(Col.RunMethod("getBean",Null))
    Log(ColNum & " : " & Width)

End Sub

 

[LucaMs]

I found just now that to prevent column reordering it would be necessary to add a listener and so I figured you could get the required event as well, like in your source, Steve.

Having it ready is a lot better, though

Thank you, Steve.

 

[LucaMs]

An error occurred:
(Line: 0) 0
java.lang.Exception: Sub columnchanged_event signature does not match expected signature.
public static anywheresoftware.b4a.pc.RemoteObject b4j.example.b4xmainpage_subs_0._columnchanged_event(anywheresoftware.b4a.pc.RemoteObject,anywheresoftware.b4a.pc.RemoteObject,anywheresoftware.b4a.pc.RemoteObject,anywheresoftware.b4a.pc.RemoteObject) throws java.lang.Exception
class anywheresoftware.b4a.pc.RemoteObject, class anywheresoftware.b4a.pc.RemoteObject, class anywheresoftware.b4a.pc.RemoteObject,

.......

 

[stevel05]

I haven't tried it in a B4xPages project. Can you upload it so I don't have to create one?

 

[LucaMs]

I haven't tried it in a B4xPages project. Can you upload it so I don't have to create one?

um.. so you think can be a problem with B4XPages.

Well... creating a new empty project...

 

[stevel05]

so you think can be a problem with B4XPages

I wouldn't have thought so, but it works in a standard project as is.

 

[LucaMs]

Um... sorry, my fault...

I had added a parameter to the SetColumnListeners, to pass it a TableView and, automatically, without thinking, I also added it to the event! So I changed the signature of the event and it obviously is no longer recognized.

It works great... even with the B4XPages, of course.

I'm sorry.

 

[LucaMs]

I was very happy (so to speak ) but obviously I will have to change/add something (another listener?) to prevent the reordering of the columns as well.

However it is already a great step forward

 

[LucaMs]

Help!!!

tableView.widthProperty().addListener(new ChangeListener<Number>()
{
    @Override
    public void changed(ObservableValue<? extends Number> source, Number oldWidth, Number newWidth)
    {
        TableHeaderRow header = (TableHeaderRow) tableView.lookup("TableHeaderRow");
        header.reorderingProperty().addListener(new ChangeListener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                header.setReordering(false);
            }
        });
    }
});

 

[LucaMs]

A different (less "elegant") way:

public static <S, T> void columnReorder(TableView table, TableColumn<S, T> ...columns) {
    table.getColumns().addListener(new ListChangeListener() {
          public boolean suspended;

          @Override
          public void onChanged(Change change) {
              change.next();
              if (change.wasReplaced() && !suspended) {
                  this.suspended = true;
                  table.getColumns().setAll(columns);
                  this.suspended = false;
              }
          }
      });
    }

 

[stevel05]

It works, but is not great. It flashes a bit.

Private Sub DisableReordering
    Dim Jo As JavaObject = TableView1
    Dim Header As JavaObject = Jo.RunMethod("lookup",Array("TableHeaderRow"))
    Dim Prop As JavaObject = Header.RunMethod("reorderingProperty",Null)
    Dim o As Object = Prop.CreateEventFromUI("javafx.beans.value.ChangeListener","HeaderOrder",Null)
    Prop.RunMethod("addListener",Array(o))
End Sub

Private Sub HeaderOrder_Event (MethodName As String, Args() As Object) As Object
    Dim JO As JavaObject = Sender
    Dim Header As JavaObject = JO.RunMethod("getBean",Null)
    Header.RunMethod("setReordering",Array(False))
End Sub

 

[stevel05]

setReordering is not in the documentation for TableHeaderRow for Java 9. Apparently public since Java 12, but it's a hack.

 

[LucaMs]

It works, but is not great. It flashes a bit.

Strangely, while the "AddColumnChangedEvent" (I just changed its name) works written right after:

Root.LoadLayout ("MainPage")

adding then

DisableReordering

crashes, as if the TableView hadn't already been initialized.

Maybe it would be necessary to put that call in the page's Appear event, but it works just adding Sleep (0) right before that.

It works, but is not great. It flashes a bit.

IT'S GREAT, STEVE!
THANK YOU AGAIN!

 

[LucaMs]

That slight flickering doesn't matter, since the sw will be available to b4x.com members, not important people

[This phrase will make everyone love me, here ]

 

[LucaMs]

crashes, as if the TableView hadn't already been initialized.

Maybe it would be necessary to put that call in the page's Appear event, but it works just adding Sleep (0) right before that.

Yes, it looks better so (not about the flickering, which is not very "annoying"):

Private Sub B4XPage_Appear
    If Not(mReorderingDisabled) Then
        DisableReordering
        mReorderingDisabled = True
    End If
End Sub

 

[stevel05]

It needs to be called as late as possible and after the table headers have been set. So In page appear sounds good.