Date: 02-16-2022
Return to Index
created by gbSnippets
'Determine if Node has at least 1 child. In this case, we don't care how
'many children the node has. This isn't a very complicated function, but it
'can be very visually convenient in writing more complicated code.
'Primary Code:
'If Node has 1 or more children, return %True, otherwise %False
'Returns 1st child of Node, or 0 if no child exists
Function TreeNodeHasChild(ByVal hNode As Dword) As Long
TreeView Get Child hDlg, %IDC_TreeView, hNode To hNode
Function = hNode '0 = no children >0 = has at least 1 child
End Function
'Compilable Example: (Jose Includes)
#Compiler PBWin 9, PBWin 10
#Compile EXE
#Dim All
%Unicode=1
#Include "Win32API.inc"
%IDC_TreeView = 100 : %IDC_Button = 200
Global hDlg As Dword
Function PBMain() As Long
Local hItem As Dword, hTemp As Dword, hTemp2 As Dword, hTemp3 As Dword
Dialog New Pixels, 0, "TreeView",200,200,155,250, %WS_SysMenu, 0 To hDlg
Control Add TreeView, hDlg, %IDC_TreeView, "", 10,10,130,200
Control Add Button, hDlg, %IDC_Button,"Has Child?", 25,220,95,20
TreeView Insert Item hDlg, %IDC_TreeView, 0, %TVI_Last, 0,0,"Root" To hItem
TreeView Insert Item hDlg, %IDC_TreeView, hItem, %TVI_Last, 0,0,"Mother" To hTemp
TreeView Insert Item hDlg, %IDC_TreeView, hTemp, %TVI_Last, 0,0,"Dan" To hTemp2
TreeView Insert Item hDlg, %IDC_TreeView, hTemp, %TVI_Last, 0,0,"Bob" To hTemp3
TreeView Set Expanded hDlg, %IDC_TreeView, hTemp, %True
TreeView Insert Item hDlg, %IDC_TreeView, hTemp3, %TVI_Last, 0,0,"Foot" To hTemp2
TreeView Insert Item hDlg, %IDC_TreeView, hTemp3, %TVI_Last, 0,0,"Arm" To hTemp2
TreeView Set Expanded hDlg, %IDC_TreeView, hTemp3, %True
TreeView Insert Item hDlg, %IDC_TreeView, hItem, %TVI_Last, 0,0,"Father" To hTemp
TreeView Insert Item hDlg, %IDC_TreeView, hTemp, %TVI_Last, 0,0,"Helen" To hTemp2
TreeView Insert Item hDlg, %IDC_TreeView, hTemp, %TVI_Last, 0,0,"Any" To hTemp3
TreeView Set Expanded hDlg, %IDC_TreeView, hTemp, %True
TreeView Insert Item hDlg, %IDC_TreeView, hTemp3, %TVI_Last, 0,0,"Leg" To hTemp2
TreeView Insert Item hDlg, %IDC_TreeView, hTemp3, %TVI_Last, 0,0,"Finger" To hTemp2
TreeView Set Expanded hDlg, %IDC_TreeView, hTemp3, %True
TreeView Set Expanded hDlg, %IDC_TreeView, hItem, %True
Dialog Show Modal hDlg Call DlgProc
End Function
CallBack Function DlgProc() As Long
Local hNode As Dword
If CB.Msg = %WM_Command AND CB.Ctl = %IDC_Button Then
TreeView Get Select hDlg, %IDC_TreeView To hNode
If TreeNodeHasChild(hNode) Then MsgBox "Has Child" Else MsgBox "No Child"
End If
End Function
Function TreeNodeHasChild(ByVal hNode As Dword) As Long
'If Node has 1 or more children, return %True, otherwise %False
'Returns 1st child of Node, or 0 if no child exists
TreeView Get Child hDlg, %IDC_TreeView, hNode To hNode
Function = hNode '0 = no children >0 = has at least 1 child
End Function
'gbs_00273
'Date: 03-10-2012
http://www.garybeene.com/sw/gbsnippets.htm