by Ben White (3 Submissions)
Category: Coding Standards
Compatability: Visual Basic 3.0
Difficulty: Beginner
Date Added: Wed 3rd February 2021
Rating: 
(4 Votes)
When a form contains a toolbar (from MS Common Controls 6.0), there is a bug in vb6 that causes the systray icon to not respond to mouse events. The workaround for this is to set the toolbar.enabled = False before creating the systray icon
API DeclarationsPublic Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function Shell_NotifyIcon Lib "shell32" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, pnid As NOTIFYICONDATA) As Boolean
VBcoders'*** This is a very simplistic Example
'*** Create a form with a toolbar named Toolbar1 and place the following code in it
'-------------
' FORM CODE
'-------------
Private Sub Form_Resize()
If Me.WindowState = vbMinimized Then
Toolbar1.Enabled = False
TrayAdd Me
End If
End Sub
Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim Result As Long
Select Case TrayEvent(Me, X)
Case 1:
TrayRestore Me
Toolbar1.Enabled = True
Case 2:
End Select
End Sub
'**** this is generic code not written, only modified by myself
'*** Create a module and place the following code in it
'-------------
' MODULE CODE
'-------------
'user defined type required by Shell_NotifyIcon API call
Private Type NOTIFYICONDATA
cbSize As Long
hwnd As Long
uId As Long
uFlags As Long
uCallBackMessage As Long
hIcon As Long
szTip As String * 64
End Type
'constants required by Shell_NotifyIcon API call:
Private Const NIM_ADD = &H0
Private Const NIM_MODIFY = &H1
Private Const NIM_DELETE = &H2
Private Const NIF_MESSAGE = &H1
Private Const NIF_ICON = &H2
Private Const NIF_TIP = &H4
Private Const WM_MOUSEMOVE = &H200
Private Const WM_LBUTTONDOWN = &H201 'Button down
Private Const WM_LBUTTONUP = &H202 'Button up
Private Const WM_LBUTTONDBLCLK = &H203 'Double-click
Private Const WM_RBUTTONDOWN = &H204 'Button down
Private Const WM_RBUTTONUP = &H205 'Button up
Private Const WM_RBUTTONDBLCLK = &H206 'Double-click
Private nid As NOTIFYICONDATA
Public Sub TrayAdd(frmWindow As Form)
With nid
.cbSize = Len(nid)
.hwnd = frmWindow.hwnd
.uId = vbNull
.uFlags = NIF_ICON Or NIF_TIP Or NIF_MESSAGE
.uCallBackMessage = WM_MOUSEMOVE
.hIcon = frmWindow.Icon
.szTip = App.Title & vbNullChar
End With
Shell_NotifyIcon NIM_ADD, nid
frmWindow.Hide
End Sub
Public Sub TrayDel()
Shell_NotifyIcon NIM_DELETE, nid
End Sub
Public Sub TrayEdit(frmWindow As Form)
With nid
.cbSize = Len(nid)
.hwnd = frmWindow.hwnd
.uId = vbNull
.uFlags = NIF_ICON Or NIF_TIP Or NIF_MESSAGE
.uCallBackMessage = WM_MOUSEMOVE
.hIcon = frmWindow.Icon
.szTip = App.Title & vbNullChar
End With
Shell_NotifyIcon NIM_MODIFY, nid
End Sub
Public Sub TrayRestore(frmWindow As Form)
Dim Result As Long
frmWindow.WindowState = vbNormal
Result = SetForegroundWindow(frmWindow.hwnd)
frmWindow.Show
Shell_NotifyIcon NIM_DELETE, nid
End Sub
Public Function TrayEvent(frmWindow As Form, X As Single)
'Call this sub from the mousemove
'event on a form
TrayEvent = 0
Dim msg As Long
If frmWindow.ScaleMode <> vbPixels Then
msg = X / Screen.TwipsPerPixelX
Else
msg = X
End If
Select Case msg
Case WM_LBUTTONDOWN
Case WM_LBUTTONUP
TrayEvent = 1
Case WM_LBUTTONDBLCLK
Case WM_RBUTTONDOWN
TrayEvent = 2
Case WM_RBUTTONUP
Case WM_RBUTTONDBLCLK
End Select
End Function
