Items.CellHasRadioButton Property (ExTree)

Retrieves or sets a value indicating whether the cell has associated a radio button or not. To change the state for a radio cell you have to use CellState property. The cell cannot display in the same time a radio and a check button. The control fires CellStateChanged event when the cell's state has been changed. To set the cell of check type you have call CellHasCheckBox property. To add or remove a cell to a given radio group you have to use CellRadioGroup property. Use the Def property to assign radio buttons for all cells in the column. Use the CellImage property to add a single icon to a cell. Use the CellImages property to assign multiple icons to a cell. Use the CellPicture property to load a custom size picture to a cell. Use the RadioImage property to change the radio button appearance.

The following VB sample sets the radio type for all cells in the first column, and group all of them in the same radio group ( 1234 ):

Dim h As Variant
Tree1.BeginUpdate
With Tree1.Items
For Each h In Tree1.Items
    .CellHasRadioButton(h, 0) = True
    .CellRadioGroup(h, 0) = 1234
Next
End With
Tree1.EndUpdate

Private Sub Tree1_AddItem(ByVal Item As EXTREELibCtl.HITEM)
    Tree1.Items.CellHasRadioButton(Item, 0) = True
    Tree1.Items.CellRadioGroup(Item, 0) = 1234
End Sub

To find out the radio cell that is checked in the radio group 1234 you have to call: MsgBox Tree1.Items.CellCaption(, Tree1.Items.CellChecked(1234))

The following sample group all cells of the first column into a radio group, and display the cell's checked on the radio group when the state of a radio group has been changed:

Private Sub Tree1_AddItem(ByVal Item As EXTREELibCtl.HITEM)
    Tree1.Items.CellHasRadioButton(Item, 0) = True
    Tree1.Items.CellRadioGroup(Item, 0) = 1234 ' The 1234 is arbirary and it represents the identifier for the radio group
End Sub

Private Sub Tree1_CellStateChanged(ByVal Item As EXTREELibCtl.HITEM, ByVal ColIndex As Long)
    Debug.Print "In the 1234 radio group the """ & Tree1.Items.CellCaption(, Tree1.Items.CellChecked(1234)) & """ is checked."
End Sub

The following VB sample assigns a radio button to the focused cell:

With Tree1.Items
    .CellHasRadioButton(.FocusItem, 0) = True
    .CellRadioGroup(.FocusItem, 0) = 1234
End With

The following C++ sample assigns a radio button to the focused cell:

#include "Items.h"
CItems items = m_tree.GetItems();
items.SetCellHasRadioButton( COleVariant( items.GetFocusItem() ), COleVariant( (long)0 ), TRUE );
items.SetCellRadioGroup( COleVariant( items.GetFocusItem() ), COleVariant( (long)0 ), 1234 );

The following VB.NET sample assigns a radio button to the focused cell:

With AxTree1.Items
    .CellHasRadioButton(.FocusItem, 0) = True
    .CellRadioGroup(.FocusItem, 0) = 1234
End With

The following C# sample assigns a radio button to the focused cell:

axTree1.Items.set_CellHasRadioButton(axTree1.Items.FocusItem, 0, true);
axTree1.Items.set_CellRadioGroup(axTree1.Items.FocusItem, 0, 1234);

The following VFP sample assigns a radio button to the focused cell:

with thisform.Tree1.Items
	.DefaultItem = .FocusItem
	.CellHasRadioButton(0,0) = .t.
	.CellRadioGroup(0,0) = 1234
endwith

Note: A cell is the intersection of an item with a column. All properties that has an Item and a ColIndex parameters are referring to a cell. The Item parameter represents the handle of an item, and the ColIndex parameter indicates an index ( a numerical value, see Column.Index property ) of a column , the column's caption ( a string value, see Column.Caption property ), or a handle to a cell. Here's few hints how to use properties with Item and ColIndex parameters:

Tree1.Items.CellBold(, Tree1.Items.ItemCell(Tree1.Items(0), 0)) = True

Tree1.Items.CellBold(Tree1.Items(0), 0) = True

Tree1.Items.CellBold(Tree1.Items(0), "ColumnName") = True

		Type	Description
		Item as Variant	A long expression that indicates the item's handle.
		ColIndex as Variant	A long expression that indicates the column's index, a string expression that indicates the column's caption or the column's key.
		Boolean	A boolean expression that indicates whether the cell contains a radio button.