B4J Question How to access cell value in Tableview?

[rbghongade]

Dear Friends,
How to access cell value in a Tableview?
regards,

 

[Erel]

Dim row() As Object = TableView1.Items.Get(0) 'first row
Dim cell As String = row(1) 'second column

 

[rbghongade]

Thank you Erel.
Now how do I set the cell value ? Basically I am converting my software for neural networks from VB.net to B4J , hence I need to access the TableView .
tried using
TableView1.Items.set(i,Row(1))
but am getting error

java.lang.ClassCastException: java.lang.Double cannot be cast to [Ljava.lang.Object;
    at anywheresoftware.b4j.objects.TableViewWrapper$MyCellValueFactory.call(TableViewWrapper.java:205)
    at anywheresoftware.b4j.objects.TableViewWrapper$MyCellValueFactory.call(TableViewWrapper.java:1)
    at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:578)
    at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:563)
    at javafx.scene.control.TableCell.updateItem(TableCell.java:644)
    at javafx.scene.control.TableCell.indexChanged(TableCell.java:468)
    at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.requestCellUpdate(TableRowSkinBase.java:659)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.handleControlPropertyChanged(TableRowSkinBase.java:234)
    at com.sun.javafx.scene.control.skin.TableRowSkin.handleControlPropertyChanged(TableRowSkin.java:70)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase.lambda$registerChangeListener$61(BehaviorSkinBase.java:197)
    at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
    at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)
    at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
    at javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
    at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113)
    at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147)
    at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:115)
    at com.sun.javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1957)
    at com.sun.javafx.scene.control.skin.VirtualFlow.addLeadingCells(VirtualFlow.java:1246)
    at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1194)
    at javafx.scene.Parent.layout(Parent.java:1087)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Scene.doLayoutPass(Scene.java:552)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
java.lang.ClassCastException: java.lang.Double cannot be cast to [Ljava.lang.Object;
    at anywheresoftware.b4j.objects.TableViewWrapper$MyCellValueFactory.call(TableViewWrapper.java:205)
    at anywheresoftware.b4j.objects.TableViewWrapper$MyCellValueFactory.call(TableViewWrapper.java:1)
    at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:578)
    at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:563)
    at javafx.scene.control.TableCell.updateItem(TableCell.java:644)
    at javafx.scene.control.TableCell.indexChanged(TableCell.java:468)
    at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.requestCellUpdate(TableRowSkinBase.java:659)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.lambda$init$497(TableRowSkinBase.java:159)
    at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
    at javafx.scene.control.Cell.setItem(Cell.java:403)
    at javafx.scene.control.Cell.updateItem(Cell.java:670)
    at javafx.scene.control.TableRow.updateItem(TableRow.java:259)
    at javafx.scene.control.TableRow.indexChanged(TableRow.java:225)
    at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
    at com.sun.javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1957)
    at com.sun.javafx.scene.control.skin.VirtualFlow.addLeadingCells(VirtualFlow.java:1246)
    at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1194)
    at javafx.scene.Parent.layout(Parent.java:1087)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Scene.doLayoutPass(Scene.java:552)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
java.lang.ClassCastException: java.lang.Double cannot be cast to [Ljava.lang.Object;
    at anywheresoftware.b4j.objects.TableViewWrapper$MyCellValueFactory.call(TableViewWrapper.java:205)
    at anywheresoftware.b4j.objects.TableViewWrapper$MyCellValueFactory.call(TableViewWrapper.java:1)
    at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:578)
    at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:563)
    at javafx.scene.control.TableCell.updateItem(TableCell.java:644)
    at javafx.scene.control.TableCell.indexChanged(TableCell.java:468)
    at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.updateCells(TableRowSkinBase.java:533)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.checkState(TableRowSkinBase.java:634)
    at com.sun.javafx.scene.control.skin.TableRowSkinBase.computePrefHeight(TableRowSkinBase.java:571)
    at javafx.scene.control.Control.computePrefHeight(Control.java:547)
    at javafx.scene.Parent.prefHeight(Parent.java:935)
    at javafx.scene.layout.Region.prefHeight(Region.java:1435)
    at com.sun.javafx.scene.control.skin.VirtualFlow.resizeCellSize(VirtualFlow.java:1947)
    at com.sun.javafx.scene.control.skin.VirtualFlow.addLeadingCells(VirtualFlow.java:1247)
    at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1194)
    at javafx.scene.Parent.layout(Parent.java:1087)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Scene.doLayoutPass(Scene.java:552)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)

 

[Erel]

I've updated the Table tutorial: https://www.b4x.com/android/forum/threads/tableview-tutorial.35542/

It includes methods to get and set the cells values.

 

[rbghongade]

Got it , Thanks again Erel. But I wish the table be editable. Will the same logic work as described elsewhere in this forum about "inline editing the table"?

 

[Erel]

You can use TextFields instead of Labels.

See the attached project.

Edit: new version uploaded that fixes the wrong index issue.

 

[Peter Lewis]

You can use TextFields instead of Labels.

See the attached project.

Now I am very confused. I though I was understanding this perfectly then When I clicked on a Cell it gives the wrong info .. Is that a Bug or is it just my machine ?
This happened after I sorted the Column.

 

[EnriqueGonzalez]

Hi Peter!

The problem is that Erel is storing the index on the tag of the textfields, everytime you reorder the index is changed, add this code to solve the issue:

private Sub tableview1_MouseClicked (EventData As MouseEvent)
    For i = 0 To TableView1.Items.Size -1
        Dim r(2) As Object = TableView1.Items.Get(i)
       
        For j = 0 To r.Length -1
            Dim txt As TextField = r(j)
            txt.Tag = i
        Next
    Next
End Sub

you may call it brutal force, but it works.


Another option, less error prone is:

private Sub TableTextField_FocusChanged (HasFocus As Boolean)
    If HasFocus Then
        Dim tf As TextField = Sender
        TableView1.SelectedRow = ASJO(tf.parent).RunMethodJO("getTableRow",Null).RunMethod("getIndex",Null)
    End If
end sub

Private Sub ASJO(JO As JavaObject) As JavaObject
    Return JO
End Sub

you can use any of the 2 solutions.

 

[Erel]

I've updated the project to fix this issue. I've used a slightly different approach:

Sub CreateRow(Row() As String) As Object()
   Dim labels(Row.Length) As Object
   For i = 0 To Row.Length - 1
     Dim lbl As TextField
     lbl.Initialize("TableTextField")
     lbl.Text = Row(i)
     lbl.Tag = labels '<-- reference to the row object.
     labels(i) = lbl
   Next
   Return labels
End Sub

Sub TableTextField_FocusChanged (HasFocus As Boolean)
   If HasFocus Then
     Dim tf As TextField = Sender
     Dim row() As Object = tf.Tag
     TableView1.SelectedRow = TableView1.Items.IndexOf(row) 'find the row index.
   End If
End Sub