In this case, the state image at the indicated index position is shown. However, the displayed images may be different if the following situation occurs: If the SelectedImageIndex of the node is set to a value other than 0 or 1, and the CheckBoxes property of the parent TreeView is set to false, the SelectedImageIndex will not automatically reset to -1 to indicate it is not set. When the CheckBoxes property of a TreeView is set to true, and the StateImageList property is set, each TreeNode that is contained in the TreeView displays the first and second images from the StateImageList to indicate an unchecked or checked state, respectively. Check boxes allow the user to select more than one tree node at a time. ' Recursively check the children of the current child node.Ī check box is displayed to the left of both the tree node label and tree node Image, if any. Private Function HasCheckedChildNodes(ByVal node As TreeNode) As Boolean ' Returns a value indicating whether the specified Private Sub CheckForCheckedChildren(ByVal sender As Object, ByVal e As TreeViewCancelEventArgs) ' Prevent expansion of a node that does not have any checked child nodes. RemoveHandler treeView1.BeforeExpand, AddressOf CheckForCheckedChildren
#Bootstrap treeview checkbox manual#
' event so manual node expansion will work correctly. ' Remove the checkForCheckedChildren event handler from the BeforeExpand ' prevented from expanding by the checkForCheckedChildren event handler. ' Add the CheckForCheckedChildren event handler to the BeforeExpand event.ĪddHandler treeView1.BeforeExpand, AddressOf CheckForCheckedChildren
' Disable redrawing of treeView1 to prevent flickering Private Sub showCheckedNodesButton_Click(ByVal sender As Object, ByVal e As EventArgs) TreeView1.Anchor = AnchorStyles.Top | AnchorStyles.Left |ĪnchorStyles.Bottom | AnchorStyles.Right New TreeViewCancelEventHandler(CheckForCheckedChildrenHandler) Private TreeViewCancelEventHandler checkForCheckedChildren Recursively check the children of the current child node. TreeNode^ childNode = safe_cast(myEnum->Current) System::Collections::IEnumerator^ myEnum = node->Nodes->GetEnumerator() Returns a value indicating whether the specifiedīool HasCheckedChildNodes( TreeNode^ node ) Void CheckForCheckedChildrenHandler( Object^ /*sender*/, TreeViewCancelEventArgs^ e ) Prevent expansion of a node that does not have any checked child nodes. TreeView1->BeforeExpand -= checkForCheckedChildren event so manual node expansion will work correctly. Remove the checkForCheckedChildren event handler from the BeforeExpand prevented from expanding by the checkForCheckedChildren event handler. TreeView1->BeforeExpand += checkForCheckedChildren Add the checkForCheckedChildren event handler to the BeforeExpand event.
Disable redrawing of treeView1 to prevent flickering Void showCheckedNodesButton_Click( Object^ /*sender*/, EventArgs^ /*e*/ ) Gets or sets a value indicating whether check boxes are displayed next to the tree nodes in the tree view control.
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