B4J Question Treeview checkedboxitem

[micro]

Hi to all
I have same problems with checkedboxitem.

In Process_Globals:
Dim itemtreebox As CheckboxTreeItem and treearc is a TreeView

Sub caricatree
    Dim l As List
    Dim res() As String
    Dim img As Image
    img.Initialize(File.DirAssets, "table.png")
    l.Initialize
    l = DBUtils.ExecuteMemoryTable(SQL1, "SELECT name, sql FROM sqlite_master WHERE type='table' ", Null, 0)
    Dim i As Int
    Dim itemup As TreeItem
    itemup.Initialize("itemup", "Archivi")
    itemup.Image = img
    For i = 2 To l.Size -1
        res = l.Get(i)
        itemtreebox.Initialize("itemtreebox", res(0))
        itemup.Children.Add(itemtreebox)
    Next
     treearc.Root.Children.Add(itemup)
    treearc.SetCheckBoxesMode
    treearc.Root.Expanded = True   
End Sub

In treearc appears the entire correct list with ceckbox but i can not understand
as control which ceckboxitem are checked and how to activate event on ceckboxitem click.
I tried with:
Sub treearc_CheckedChange or itemtrrebox_CheckedChange but not work.
Only Sub treearc_SelectedItemChanged(SelectedItem As TreeItem) is raised.
Thanks

 

[rwblinn]

Hi,

use like below - There might be other solutions.

Sub CheckboxItem_CheckedChange(Checked As Boolean)
    Dim CheckboxItem As CheckboxTreeItem = Sender
    Log("CheckBoxItem state changed to " & Checked & " for " & CheckboxItem.Text)
End Sub

Sub TreeView1_SelectedItemChanged(SelectedItem As TreeItem)
   Dim CheckboxItem As CheckboxTreeItem = SelectedItem
   Log("SelectedItemChanged: " & SelectedItem.Text & ", State is " & CheckboxItem.Checked)
End Sub

The events are described in the documentation:
https://www.b4x.com/b4j/help/jfx.html#checkboxtreeitem

Pls find simple testproject attached.

 

[micro]

Ok, thanks rwblinn, now work.
Is possible ceck in a treeviwe wich item are checked with a iteration

For each cbt as CheckboxTreeItem in TreeView.....
    Dim check as boolean = cbt.Checked
Next

 

[rwblinn]

Hi,

use like

For i = 0 To TreeView1.Root.Children.Size - 1
  Dim CheckboxItem As CheckboxTreeItem = TreeView1.Root.Children.Get(i)
  Log(CheckboxItem.Text & " = " & CheckboxItem.Checked)
Next

Pls note correction in Post #2 for TreeView1_SelectedItemChanged.

 

[micro]

Thank you very much.

 

[micro]

For i = 0 To TreeView1.Root.Children.Size - 1

returns only the value 1 (the first item), the subitem rightly are not counted and if i add:

Dim treeitem As TreeItem = treearc.Root.Parent

treeitem is always empty (not initialized).
Good day to all.

 

[rwblinn]

Test if this works to get all items in the treeview populated with checkboxitems.

Private Sub CollectTreeItems(TreeItems As List, Items As List)
    For Each ti As TreeItem In Items
        Dim CheckboxItem As CheckboxTreeItem = ti
        TreeItems.Add(ti.Text & " = " & CheckboxItem.Checked)
        If ti.Children.Size > 0 Then
            CollectTreeItems(TreeItems, ti.Children)
        End If
    Next
End Sub

Then call like

Dim TreeList As List
TreeList.Initialize
CollectTreeItems(TreeList, TreeView1.Root.Children)
For i = 0 To TreeList.Size - 1
    Log(TreeList.Get(i))
Next

 

[micro]

This line code in Sub CollectTreeItems

TreeItems.Add(ti.Text & " = " & CheckboxItem.Checked)

generates the following exception

Program started.
Error occurred on line: 742 (main).
java.lang.RuntimeException: java.lang.IllegalArgumentException: object is not an instance of declaring class
    at anywheresoftware.b4j.objects.TreeViewWrapper$CheckBoxTreeItemWrapper.getChecked(TreeViewWrapper.java:213)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:563)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:221)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:156)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:82)
    at anywheresoftware.b4a.BA$2.run(BA.java:165)
    at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
    at com.sun.javafx.application.PlatformImpl$$Lambda$48/1593970726.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
    at com.sun.javafx.application.PlatformImpl$$Lambda$47/254413710.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
    at com.sun.glass.ui.win.WinApplication$$Lambda$36/326549596.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4j.objects.TreeViewWrapper$CheckBoxTreeItemWrapper.getChecked(TreeViewWrapper.java:210)
    ... 24 more

but the problem is that
treearc.Root.Children return 1 as size (the first item and not the subitem).

 

[micro]

Ok, work.
The problem is that the first item is a TreeItem and the subItem are CheckboxTreeItem, than

TreeItems.Add(ti.Text & " = " & CheckboxItem.Checked)

generates an exception.
Thanks