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ID: 250
Viewed: 2774
Added: Jul 26, 2002
Snippet uploaded by: snippet
Written By: unknown
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To add buttons to title bar, besides the ones that are already there

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Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long 
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As Rect) As Long
Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook&, ByVal lpfn&, ByVal hmod&, ByVal dwThreadId&) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook&) As Long
Private Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long

Private Type Rect
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Type CWPSTRUCT
lParam As Long
wParam As Long
Message As Long
hwnd As Long
End Type

Const WM_MOVE = &H3
Const WM_NCPAINT = &H85
Const WM_COMMAND = &H111

Const GWL_EXSTYLE = -20

Private WHook&
Private ButtonHwnd As Long

Public Sub Init()
'Create the button that is going to be placed in the Titlebar
ButtonHwnd& = CreateWindowEx(0&, "Button", "i", &H40000000, 50, 50, 14, 14, Form1.hwnd, 0&, App.hInstance, 0&)
'Show the button cause it´s invisible
Call ShowWindow(ButtonHwnd&, 1)
'Initialize the window hooking for the button
WHook = SetWindowsHookEx(4, AddressOf HookProc, 0, App.ThreadID)
Call SetWindowLong(ButtonHwnd&, GWL_EXSTYLE, &H80)
Call SetParent(ButtonHwnd&, GetParent(Form1.hwnd))
End Sub

Public Sub Terminate()
'Terminate the window hooking
Call UnhookWindowsHookEx(WHook)
Call SetParent(ButtonHwnd&, Form1.hwnd)
End Sub

Public Function HookProc&(ByVal nCode&, ByVal wParam&, Inf As CWPSTRUCT)
Dim FormRect As Rect
Static LastParam&
If Inf.hwnd = GetParent(ButtonHwnd&) Then
If Inf.Message = WM_COMMAND Then
Select Case LastParam
'If the LastParam is cmdInTitlebar call the Click-Procedure
'of the button
Case ButtonHwnd&: Call Form1.cmdInTitlebar_Click
End Select
ElseIf Inf.Message = WM_SETCURSOR Then
LastParam = Inf.wParam
End If
ElseIf Inf.hwnd = Form1.hwnd Then
If Inf.Message = WM_NCPAINT Or Inf.Message = WM_MOVE Then
'Get the size of the Form
Call GetWindowRect(Form1.hwnd, FormRect)
'Place the button int the Titlebar
Call SetWindowPos(ButtonHwnd&, 0, FormRect.Right - 75, FormRect.Top + 6, 17, 14, SWP_FRAMECHANGED)
End If
End If
End Function

Highlight All
And Put this In the Form's module: 

Public Sub cmdInTitlebar_Click()
Me.WindowState = 1 'minimizes the form
End Sub

Private Sub Form_Load()
Call Init
End Sub

Private Sub Form_Unload(Cancel As Integer)
Call Terminate
End Sub

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