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Controlling images of nodes in a TreeView


Controlling images of nodes in a TreeView

By : user3861714
Date : November 21 2020, 07:01 PM
hop of those help? I'll assume here you only want to change the TreeNode image shown when a given Node is selected. And I'm not going to deal here with the issue of showing 'folder icons for every TreeNode with Child Nodes: I think if you grasp what's going on here, you'll have no problem adding a (third) image and "doing the right thing" to make folders explicit: and then you can extend that, if you wish, so Nodes with "no child nodes" can have different icons for selected/unselected.
(1 add an ImageList to your Form with two images: the image with index #0 will be the default (unselected) TreeNode image.
code :


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Is it possible to add images to treeview nodes without using a ImageList?

Is it possible to add images to treeview nodes without using a ImageList?


By : John
Date : March 29 2020, 07:55 AM
This might help you I think you have two options. You can populate an ImageList from your data like you're suggesting, or you can draw the image onto the control yourself (with the Paint event).
MFC Treeview : How to apply different images to different nodes in Treeview?

MFC Treeview : How to apply different images to different nodes in Treeview?


By : user2392790
Date : March 29 2020, 07:55 AM
will help you You can use BOOL SetItemImage(HTREEITEM hItem, int nImage, int nSelectedImage); it within CTreeCtrl class.
UPD: Import your bitmaps in your resource pain and load them:
code :
m_Bitmap1.LoadBitmap(IDB_BITMAP1);
m_Bitmap2.LoadBitmap(IDB_BITMAP9);
m_Bitmap3.LoadBitmap(IDB_BITMAP10);
m_Bitmap4.LoadBitmap(IDB_BITMAP8);
m_ImageListTree = new CImageList;
m_ImageListTree->Create(IDB_BITMAP1, 16, 1, RGB(255, 255, 255));
m_ImageListTree->Add(&m_Bitmap2, RGB(255, 255, 255));
m_ImageListTree->Add(&m_Bitmap3, RGB(255, 255, 255));
m_ImageListTree->Add(&m_Bitmap4, RGB(255, 255, 255));
Sorting child nodes of a treeview after populating the treeview in c# winforms

Sorting child nodes of a treeview after populating the treeview in c# winforms


By : srinivas
Date : March 29 2020, 07:55 AM
this one helps. You need to create a custom comparer and assign it to the TreeViewNodeSorter property:
code :
public class NodeSorter : System.Collections.IComparer
{
    public int Compare(object x, object y)
    {
        TreeNode tx = (TreeNode)x;
        TreeNode ty = (TreeNode)y;

        // Your sorting logic here... return -1 if tx < ty, 1 if tx > ty, 0 otherwise
        ...
    }
}


...

treeView.TreeViewNodeSorter = new NodeSorter();
treeView.Sort();
Assign different images for different nodes in TreeView

Assign different images for different nodes in TreeView


By : Southie75
Date : March 29 2020, 07:55 AM
Any of those help I think you're searching for TreeNode.ImageIndex property use.
Assign an index of the Image present in TreeView's associated ImageList.
Using single panel containing checkboxes for multiple treeview nodes (Images & Code Attached)

Using single panel containing checkboxes for multiple treeview nodes (Images & Code Attached)


By : dan54166
Date : March 29 2020, 07:55 AM
To fix this issue What you clearly need is a way to store the user's selections in memory, before saving them to the spreadsheet. There are several ways you could do this, but given your inexperience I suggest you consider the simplest, which is to define a basic class to represent the user's selections for a single node, and an array – where each item is an instance of the class – to store the entire set of user selections.
Define the node selection class – to represent selections for a single node:
code :
Public Class NodeSelection
    Public CheckA As Boolean
    Public PickAIndex As Integer = -1
    Public CheckB As Boolean
    Public PickBIndex As Integer = -1
    Public CheckC As Boolean
    Public PickCIndex As Integer = -1
    Public ItemProcessed As Boolean
End Class
Private _userPicks(89) As NodeSelection 'Array of user's selections
Private _previousIndex As Integer = -1  'Used to record the previously selected node
'Instantiate the class for each element of the array 
For i As Integer = 0 To _userPicks.Count - 1
    _userPicks(i) = New NodeSelection
Next
Private Sub TreeView1_AfterSelect(sender As Object, e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect

    'Exit if the click is on the parent node (Node0)
    If e.Node.GetNodeCount(False) > 0 Then Return

    UpdateNodeInfo()

    'If the currently selected node has already been processed, 
    'restore user selection values to the controls,
    'otherwise reset the controls
    With _userPicks(e.Node.Index)
        CheckBox1.Checked = If(.ItemProcessed, .CheckA, False)
        ComboBox1.SelectedIndex = If(.ItemProcessed, .PickAIndex, -1)
        CheckBox2.Checked = If(.ItemProcessed, .checkB, False)
        ComboBox2.SelectedIndex = If(.ItemProcessed, .PickBIndex, -1)
        CheckBox3.Checked = If(.ItemProcessed, .checkC, False)
        ComboBox3.SelectedIndex = If(.ItemProcessed, .PickCIndex, -1)
    End With

    'Color the previous selection so the user can see it's been processed
    If _previousIndex >= 0 Then TreeView1.Nodes(0).Nodes(_previousIndex).BackColor = Color.AntiqueWhite

    'Record this (selected) node's index for updating when the next node is selected
    _previousIndex = e.Node.Index
End Sub

Private Sub UpdateNodeInfo()
    If _previousIndex < 0 Then Return 'No item has been set yet
    With _userPicks(_previousIndex)
        .CheckA = CheckBox1.Checked
        .PickAIndex = If(.CheckA, ComboBox1.SelectedIndex, -1)
        .CheckB = CheckBox2.Checked
        .PickBIndex = If(.CheckB, ComboBox2.SelectedIndex, -1)
        .checkC = CheckBox3.Checked
        .PickCIndex = If(.checkC, ComboBox3.SelectedIndex, -1)
        .ItemProcessed = True 'Record the fact the item has already been processed
    End With
End Sub
For i As Integer = 0 To _userPicks.Count - 1
    With _userPicks(i)
        oSheet.Cells(3, i + 2) = "Node" & (i + 1).ToString
        oSheet.Cells(9, i + 2) = "Node" & (i + 1).ToString
        oSheet.Cells(4, i + 2) = If(.ItemProcessed AndAlso .CheckA, 1, 0)
        oSheet.Cells(5, i + 2) = If(.ItemProcessed AndAlso .CheckB, 1, 0)
        oSheet.Cells(6, i + 2) = If(.ItemProcessed AndAlso .checkC, 1, 0)
        oSheet.Cells(10, i + 2) = If(.ItemProcessed AndAlso .CheckA, ComboBox1.Items(.PickAIndex).ToString, "")
        oSheet.Cells(11, i + 2) = If(.ItemProcessed AndAlso .CheckB, ComboBox1.Items(.PickBIndex).ToString, "")
        oSheet.Cells(12, i + 2) = If(.ItemProcessed AndAlso .checkC, ComboBox1.Items(.PickCIndex).ToString, "")
    End With
Next
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