Treeview Node click behavior

DanielH Published at Dev

DanielH

I have a Winform application where I am using TreeView. Some users of this application have a problem that they must double click on a node to expand it. So I added this code to use single click to expand nodes:

Private Sub MyTreeView_NodeMouseClick(sender As System.Object, 
     e As System.Windows.Forms.TreeNodeMouseClickEventArgs) Handles MyTreeView.NodeMouseClick

    If e.Node.IsExpanded Then
        e.Node.Collapse()
    Else
        e.Node.Expand()
    End If

End Sub

This works but I noticed strange behavior regarding clicking on a nodes. I noticed that there are 2 places with different behavior. First place is with +/- symbol and dots next to it (first circle in the picture), second place is a text of the node (second circle):

enter image description here

Normally single click on the first place is enough to expand node and double click must be done on the second place to expand node. Then when I use my code, single click on the second place is enough to expand the node but when I do single click on the first place, the node is expanded and collapsed.

Why the user must do twice more clicks on the second place to expand node? What can I do to expand nodes with single click on both places? Thank you guys!

John Arlen

The plus/minus is still considered part of the Node - and when the user clicks it, your code toggles the expansion but the framework continues and does the same.

Add to your code to not act on the plus/minus:

private static void TreeView_OnNodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
    var hitTest = e.Node.TreeView.HitTest(e.Location);
    if (hitTest.Location == TreeViewHitTestLocations.PlusMinus)
        return;

    if (e.Node.IsExpanded)
        e.Node.Collapse();
    else
        e.Node.Expand();
}

Collected from the Internet

Please contact [email protected] to delete if infringement.

edited at2021-02-9

Comments

0 comments

From Dev

Related Related

Article

Treeview Node click behavior

Treeview Node click behavior

Bind Gridview on Treeview Node Click

Change selected Treeview Node on Datagridview Cell Click

How to add WPF treeView Node Click event to get the node value

How to add WPF treeView Node Click event to get the node value

Winform:TreeView Node Collapse without Node Click event firing

Treeview .Click and .MouseClick event not firing when no node is clicked

Telerik Kendo ui treeView - expand/collapse node on single click

Execute code on Mouse Click and Keyboard node selection - Virtual Treeview

Treeview .Click and .MouseClick event not firing when no node is clicked

TreeView double click event

Detect click on the Collapsebutton in a TreeView

Detect click on the Collapsebutton in a TreeView

Remove node from TreeView

Treeview node format

Deselect TreeView Node

Find Treeview node recursively

NullReferenceException on TreeView node deselect

Treeview node format

Remove node from TreeView

JQuery validation for treeview node

retrieve treeview data on double click

Inconsistent behavior from .click()?

Recursively adding a node into a .NET TreeView

WPF TreeView parent node binding

WPF: TreeView get parent node

Disable TreeView Node Focus Cue

Winform Treeview find node by tag

Finding specific tree node in TreeView

Making a node in Tkinter Treeview unselectable