B4J Question How to access cell value in Tableview?

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rbghongade

rbghongade

Active Member
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Longtime User
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
B4X: 
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)
 
Last edited:
Upvote 0
rbghongade

rbghongade

Active Member
Licensed User
Longtime User
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"?
 
Upvote 0
Erel

Erel

B4X founder
Staff member
Licensed User
Longtime User
You can use TextFields instead of Labels.

SS-2017-06-07_15.04.30.png


See the attached project.

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

Attachments

  • TableExample.zip
    2.8 KB · Views: 260
Last edited:
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P

Peter Lewis

Active Member
Licensed User
Longtime User
Erel said:
You can use TextFields instead of Labels.

SS-2017-06-07_15.04.30.png


See the attached project.
Click to expand...


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.

huh.png
 
Upvote 0
EnriqueGonzalez

EnriqueGonzalez

Well-Known Member
Licensed User
Longtime User
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:

B4X: 
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:

B4X: 
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.
 
Upvote 0
Erel

Erel

B4X founder
Staff member
Licensed User
Longtime User
I've updated the project to fix this issue. I've used a slightly different approach:
B4X: 
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
 
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