 Often,
in attempting to display a menu with a large number of selections, it may exceed the screen height truncating the menu list. This page
details using the SetMenuItemInfo API to split a menu into sections.
Two methods are provided. The first simply uses the menu item count
to split the menu before the last entry. The second method splits a menu in half; if it contains an odd number of entries, it assures that the
'extra' entry is added into the first column. |
Option Explicit
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Copyright ©1996-2011 VBnet/Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Distribution: You can freely use this code in your own
' applications, but you may not reproduce
' or publish this code on any web site,
' online service, or distribute as source
' on any media without express permission.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Private Const MIIM_STATE As Long = &H1
Private Const MIIM_ID As Long = &H2
Private Const MIIM_SUBMENU As Long = &H4
Private Const MIIM_CHECKMARKS As Long = &H8
Private Const MIIM_TYPE As Long = &H10
Private Const MIIM_DATA As Long = &H20
Private Const MFT_RADIOCHECK As Long = &H200
Private Const MFT_STRING As Long = &H0
Private Const RGB_STARTNEWCOLUMNWITHVERTBAR As Long = &H20
Private Const RGB_STARTNEWCOLUMN As Long = &H40
Private Const RGB_EMPTY As Long = &H100
Private Const RGB_VERTICALBARBREAK As Long = &H160
Private Const RGB_SEPARATOR As Long = &H800
Private Type MENUITEMINFO
cbSize As Long
fMask As Long
fType As Long
fState As Long
wID As Long
hSubMenu As Long
hbmpChecked As Long
hbmpUnchecked As Long
dwItemData As Long
dwTypeData As String
cch As Long
End Type
Private Declare Function GetMenu Lib "user32" _
(ByVal hwnd As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" _
(ByVal hMenu As Long) As Long
Private Declare Function GetSubMenu Lib "user32" _
(ByVal hMenu As Long, ByVal nPos As Long) As Long
Private Declare Function GetMenuItemInfo Lib "user32" _
Alias "GetMenuItemInfoA" _
(ByVal hMenu As Long, ByVal un As Long, _
ByVal b As Boolean, lpmii As MENUITEMINFO) As Long
Private Declare Function SetMenuItemInfo Lib "user32" _
Alias "SetMenuItemInfoA" _
(ByVal hMenu As Long, ByVal uItem As Long, _
ByVal fByPosition As Long, lpmii As MENUITEMINFO) As Long
Private Sub Command1_Click()
'divides the menu at the last menu
'item (mnuItemCount - 1)
Dim hSubMenu As Long
Dim mnuItemCount As Long
Dim mInfo As MENUITEMINFO
'get the menuitem handle
hSubMenu = GetSubMenu(GetMenu(Me.hWnd), 0)
mnuItemCount = GetMenuItemCount(hSubMenu)
'retrieve the current information for the
'last item in the menu into an MENUITEMINFO
'structure.
'True means MF_BYPOSITION.
With mInfo
.cbSize = Len(mInfo)
.fMask = MIIM_TYPE
.fType = MFT_STRING
.dwTypeData = Space$(256)
.cch = Len(mInfo.dwTypeData)
End With
Call GetMenuItemInfo(hSubMenu, mnuItemCount - 1, True, mInfo)
'modify its attributes to the new Type,
'telling the menu to insert a break before
'the member in the MENUITEMINFO structure.
mInfo.fType = RGB_STARTNEWCOLUMNWITHVERTBAR
'we only want to change the style,
'so reset fMask
mInfo.fMask = MIIM_TYPE
Call SetMenuItemInfo(hSubMenu, mnuItemCount - 1, True, mInfo)
Print " Done !"
End Sub
Private Sub Command2_Click()
'divides the menu into 2 even columns
Dim hSubMenu As Long
Dim mnuItemCount As Long
Dim mInfo As MENUITEMINFO
Dim pad As Long
'get the menuitem handle
hSubMenu = GetSubMenu(GetMenu(Me.hWnd), 0)
mnuItemCount = GetMenuItemCount(hSubMenu)
'if there are an odd number of menu items, make
'sure that the left column has the extra item
If mnuItemCount Mod 2 <> 0 Then pad = 1
'retrieve the current information for the
'last item in the menu into an MENUITEMINFO
'structure.
'True means MF_BYPOSITION.
With mInfo
.cbSize = Len(mInfo)
.fMask = MIIM_TYPE
.fType = MFT_STRING
.dwTypeData = Space$(256)
.cch = Len(mInfo.dwTypeData)
End With
Call GetMenuItemInfo(hSubMenu, (mnuItemCount \ 2) + pad, True, mInfo)
'modify its attributes to the new Type,
'telling the menu to insert a break before
'the member in the MENUITEMINFO structure.
mInfo.fType = RGB_STARTNEWCOLUMNWITHVERTBAR
mInfo.fMask = MIIM_TYPE
Call SetMenuItemInfo(hSubMenu, (mnuItemCount \ 2) + pad, True, mInfo)
Print " Done !"
End Sub |
