Question

Simple Question in Nodes (TreeView control)

Asked by: waleed_makarem

Hi all  ,


I have a simple question regarding Nodes in treeview control .
i need to desing the following treeview control having the following specifications :-

1- have 4 Parent Nodes A, B,C,D (with different images from an image list)
2- each parent node (ie A,B,C or D ) have 3 subNodes (ie A have children 1,2,3 ) , (B have 4,5,6) ,... etc
3- when the user click any of these Parent Node , the first children in this node is selected and msgbox appears to describle the name of the subNode (child) and the name of the parent.
4 whne the user click any of the child nodes , msgbox returning the name of the parent node and the name of the child node
5- when the user clicks another Parent Node , the previous Parent node collapses and the new one expands
6-- and same as above for the next main node

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Asked On
2004-03-15 at 12:34:47ID20919666
Tags

treeview

Topic

Visual Basic Programming

Participating Experts
2
Points
25
Comments
9

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Answers

 

by: Idle_MindPosted on 2004-03-15 at 22:12:16ID: 10603735

Create a new project and add a TreeView control and a label.

Personally, I think having a MsgBox on each click is a bad idea so I made the info appear in a Label instead.  It's easy enough to change it to a MsgBox if you like.

All you need to do is implement the image list.

Idle_Mind

Private Sub Form_Load()
    Dim nodX As Node   ' Declare the object variable.
   
    Set nodX = TreeView1.Nodes.Add(, , "A", "A")
    Set nodX = TreeView1.Nodes.Add("A", tvwChild, "A1", "1")
    Set nodX = TreeView1.Nodes.Add("A", tvwChild, "A2", "2")
    Set nodX = TreeView1.Nodes.Add("A", tvwChild, "A3", "3")
   
    Set nodX = TreeView1.Nodes.Add(, , "B", "B")
    Set nodX = TreeView1.Nodes.Add("B", tvwChild, "B4", "4")
    Set nodX = TreeView1.Nodes.Add("B", tvwChild, "B5", "5")
    Set nodX = TreeView1.Nodes.Add("B", tvwChild, "B6", "6")
   
    Set nodX = TreeView1.Nodes.Add(, , "C", "C")
    Set nodX = TreeView1.Nodes.Add("C", tvwChild, "C7", "7")
    Set nodX = TreeView1.Nodes.Add("C", tvwChild, "C8", "8")
    Set nodX = TreeView1.Nodes.Add("C", tvwChild, "C9", "9")
   
    Set nodX = TreeView1.Nodes.Add(, , "D", "D")
    Set nodX = TreeView1.Nodes.Add("D", tvwChild, "D10", "10")
    Set nodX = TreeView1.Nodes.Add("D", tvwChild, "D11", "11")
    Set nodX = TreeView1.Nodes.Add("D", tvwChild, "D12", "12")
End Sub

Private Sub TreeView1_NodeClick(ByVal Node As MSComctlLib.Node)
    Dim x As Node
       
    If Node.Parent Is Nothing Then
        For Each x In TreeView1.Nodes
            If x.Parent Is Nothing And x.Key <> Node.Key Then
                x.Expanded = False
            End If
        Next x
        Node.Expanded = True
        Node.Child.Selected = True
    End If
    Label1.Caption = "Node: " & TreeView1.SelectedItem.Text _
        & "     Parent Node: " & TreeView1.SelectedItem.Parent.Text
End Sub

 

by: daniellyhPosted on 2004-03-16 at 08:18:33ID: 10607382

HI idle_mind,
i tried ur method but i got 1 question here.

i set my treeview properties, checkbox = true, hide selection=true.when i run ur code, it doesn't capture the correct result.it will always capture the highlighted item in the treeview, which captured as treeview1.selected. this mean even i check on index 10, but my treeview's highlighted item will still remain on index 5, and the result .selected will return value of index 5.

it will return correct asnwer only when user purposely highlight that item, then check on the check box for the same item, which is not logic.

may b some of my properties setting is not correct, pls correct me if i m wrong.

rgds,
daniel

 

by: Idle_MindPosted on 2004-03-16 at 09:04:24ID: 10607770

No Problem.

When you check the box it fires a different event.  Change your program to this and you should get the desired behaviour.

Idle_Mind

Option Explicit

Private Sub Form_Load()
    Dim nodX As Node   ' Declare the object variable.
   
    Set nodX = TreeView1.Nodes.Add(, , "A", "A")
    Set nodX = TreeView1.Nodes.Add("A", tvwChild, "A1", "1")
    Set nodX = TreeView1.Nodes.Add("A", tvwChild, "A2", "2")
    Set nodX = TreeView1.Nodes.Add("A", tvwChild, "A3", "3")
   
    Set nodX = TreeView1.Nodes.Add(, , "B", "B")
    Set nodX = TreeView1.Nodes.Add("B", tvwChild, "B4", "4")
    Set nodX = TreeView1.Nodes.Add("B", tvwChild, "B5", "5")
    Set nodX = TreeView1.Nodes.Add("B", tvwChild, "B6", "6")
   
    Set nodX = TreeView1.Nodes.Add(, , "C", "C")
    Set nodX = TreeView1.Nodes.Add("C", tvwChild, "C7", "7")
    Set nodX = TreeView1.Nodes.Add("C", tvwChild, "C8", "8")
    Set nodX = TreeView1.Nodes.Add("C", tvwChild, "C9", "9")
   
    Set nodX = TreeView1.Nodes.Add(, , "D", "D")
    Set nodX = TreeView1.Nodes.Add("D", tvwChild, "D10", "10")
    Set nodX = TreeView1.Nodes.Add("D", tvwChild, "D11", "11")
    Set nodX = TreeView1.Nodes.Add("D", tvwChild, "D12", "12")
End Sub

Private Sub TreeView1_NodeCheck(ByVal Node As MSComctlLib.Node)
    Node.Selected = True
    Call TreeView1_NodeClick(Node)
End Sub

Private Sub TreeView1_NodeClick(ByVal Node As MSComctlLib.Node)
    Dim x As Node
       
    If Node.Parent Is Nothing Then
        For Each x In TreeView1.Nodes
            If x.Parent Is Nothing And x.Key <> Node.Key Then
                x.Expanded = False
            End If
        Next x
        Node.Expanded = True
        Node.Child.Selected = True
    End If
    Label1.Caption = "Node: " & TreeView1.SelectedItem.Text _
        & "     Parent Node: " & TreeView1.SelectedItem.Parent.Text
End Sub

 

by: waleed_makaremPosted on 2004-03-16 at 11:10:25ID: 10608939

I will try it right now .

thanks

 

by: daniellyhPosted on 2004-03-17 at 04:34:21ID: 10614523

hi idle_mind,
i have some questions abt treeview posted at
http://www.experts-exchange.com/Programming/Programming_Languages/Visual_Basic/VB_Controls/Q_20921800.html

it offer quite reasonable points.  :-)

rgds,
daniel

 

by: waleed_makaremPosted on 2004-03-27 at 09:50:37ID: 10695375

hi idle_mind ,

Your code is excellent .However , it has a weak point , if the user click a node that does NOT have children subitems , ,and error message will appear . In this case i want to return the parent node and the child node will be ""  ie NULL .

thanks and forgive me for delay ,

waleed

 

by: Idle_MindPosted on 2004-03-27 at 09:59:43ID: 10695407

True.  Here is one way to fix it:

Private Sub TreeView1_NodeClick(ByVal Node As MSComctlLib.Node)
    Dim x As Node
       
    If Node.Parent Is Nothing Then
        For Each x In TreeView1.Nodes
            If x.Parent Is Nothing And x.Key <> Node.Key Then
                x.Expanded = False
            End If
        Next x
        Node.Expanded = True
        If Node.Children > 0 Then
            Node.Child.Selected = True
            Label1.Caption = "Node: " & TreeView1.SelectedItem.Text _
                & "     Parent Node: " & TreeView1.SelectedItem.Parent.Text
        Else
            Label1.Caption = "Node: " & TreeView1.SelectedItem.Text
        End If
    End If
End Sub

 

by: waleed_makaremPosted on 2004-05-30 at 07:29:16ID: 11190997

Hi Idle Mind ,


Thanks for your code , and forgive me for being late , as i went abroad for a long period and i had  no time to test ur code .
 
You must have got your points by now .

Regards,
Waleed

 

by: daniellyhPosted on 2004-05-30 at 10:11:43ID: 11191647

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