ACC2000: How to Get the Right and Down Measurements of a Form

• Microsoft Access 2000

SUMMARY

This article shows you how to create a Visual Basic for Applications Sub procedure called GetFormDimensions to get a form window's right and down measurements so that you can use them in the MoveSize macro action. This article also demonstrates how to position a form immediately below or to the right of a second form. Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact a Microsoft Certified Solution Provider or the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Solution Providers, please see the following page on the World Wide Web:

http://www.microsoft.com/mcsp/

http://www.microsoft.com/support/supportnet/overview/overview.asp

MORE INFORMATION

In Microsoft Access, you can use the WindowWidth and WindowHeight form properties to determine the current width and height of the window that a form is contained in. However, there are no properties to determine the window's right and down measurements (these measurements are commonly used in the MoveSize macro action to position a form window).

The right and down measurements, along with the width and height, are useful if you want to position a form side-by-side with another form. The following examples show you how to create and use the GetFormDimensions Sub procedure to get these measurements and to use them to position a form to the right of, and then below, another form by using the MoveSize macro action.

How to Create the Sub Procedure

1. Open the sample database Northwind.mdb.



2. Create a module and type the following line in the Declarations section:




Option Explicit

Type RECT_Type
   left As Long
   top As Long
   right As Long
   bottom As Long
End Type

Declare Function apiGetWindowRect Lib "user32" Alias _
   "GetWindowRect" (ByVal hWnd As Long, lpRect As RECT_Type) As Long
Declare Function apiGetDC Lib "user32" Alias "GetDC" _
   (ByVal hWnd As Long) As Long
Declare Function apiReleaseDC Lib "user32" Alias "ReleaseDC" (ByVal _
   hWnd As Long, ByVal hDC As Long) As Long
Declare Function apiGetDeviceCaps Lib "gdi32" Alias "GetDeviceCaps" _
   (ByVal hDC As Long, ByVal nIndex As Long) As Long
Declare Function apiGetActiveWindow Lib "user32" Alias _
   "GetActiveWindow" () As Long
Declare Function apiGetParent Lib "user32" Alias "GetParent" (ByVal _
   hWnd As Long) As Long
Declare Function apiGetClassName Lib "user32" Alias "GetClassNameA" _
   (ByVal hWnd As Long, ByVal lpClassName As String, ByVal _
   nMaxCount As Long) As Long

Global Const TWIPSPERINCH = 1440 

3. Type the following procedure:




Sub GetFormDimensions(F As Form, FLeft As Long, FTop As Long, _
   FWidth As Long, FHeight As Long)
   '*************************************************************
   ' PURPOSE: Returns the left, top, width, and height
   '          measurements of a form window in tdwips.
   ' ARGUMENTS:
   '    F: The form object whose measurements are to be determined.
   '    FLeft, FTop, FWidth, FHeight: Measurement variables
   '    that will return the dimensions of form F "by reference."
   ' NOTE: The FWidth and FHeight values will be equivalent to
   '    those provided by the form WindowWidth and WindowHeight
   '    properties.
   '*************************************************************
   Dim FormRect As RECT_Type
   Dim MDIClient As RECT_Type
   Dim MDIClientLeft As Long
   Dim MDIClientTop  As Long
   
   ' Get the screen coordinates and window size of the form.
   ' The screen coordinates are returned in pixels measured
   ' from the upper-left corner of the screen.
   apiGetWindowRect F.hWnd, FormRect
   FLeft = FormRect.left
   FTop = FormRect.top
   FWidth = FormRect.right - FormRect.left
   FHeight = FormRect.bottom - FormRect.top
   
   ' Convert the measurements from pixels to twips.
   ConvertPIXELSToTWIPS FLeft, FTop
   ConvertPIXELSToTWIPS FWidth, FHeight
   
   ' If the form is not a pop-up form, adjust the screen
   ' coordinates to measure from the top of the Microsoft
   ' Access MDIClient window. Position 0,0 for a pop-up form
   ' is the upper-left corner of the screen, whereas position
   ' 0,0 for a normal window is the upper-left corner of the
   ' Microsoft Access client window below the menu bar.
   If GetWindowClass(F.hWnd) <> "OFormPopup" Then
      ' Get the screen coordinates and window size of the
      ' MDIClient window.
      apiGetWindowRect apiGetParent(F.hWnd), MDIClient
      MDIClientLeft = MDIClient.left
      MDIClientTop = MDIClient.top
      ConvertPIXELSToTWIPS MDIClientLeft, MDIClientTop
      
      ' Adjust the form dimensions from the MDIClient
      ' measurements.
      FLeft = FLeft - MDIClientLeft
      FTop = FTop - MDIClientTop
   End If
End Sub

Sub ConvertPIXELSToTWIPS(X As Long, Y As Long)

   '*************************************************************
   ' PURPOSE: Converts the two pixel measurements passed as
   '          arguments to twips.
   ' ARGUMENTS:
   '    X, Y: Measurement variables in pixels. These will be
   '          converted to twips and returned through the same
   '          variables "by reference."
   '*************************************************************
   Dim hDC As Long, hWnd As Long, RetVal As Long
   Dim XPIXELSPERINCH, YPIXELSPERINCH
   Const LOGPIXELSX = 88
   Const LOGPIXELSY = 90
   
   ' Retrieve the current number of pixels per inch, which is
   ' resolution-dependent.
   hDC = apiGetDC(0)
   XPIXELSPERINCH = apiGetDeviceCaps(hDC, LOGPIXELSX)
   YPIXELSPERINCH = apiGetDeviceCaps(hDC, LOGPIXELSY)
   RetVal = apiReleaseDC(0, hDC)
   
   ' Compute and return the measurements in twips.
   X = (X / XPIXELSPERINCH) * TWIPSPERINCH
   Y = (Y / YPIXELSPERINCH) * TWIPSPERINCH

End Sub

Function GetWindowClass(hWnd As Long) As String

   '*************************************************************
   ' PURPOSE: Retrieve the class of the passed window handle.
   ' ARGUMENTS:
   '    hWnd: The window handle whose class is to be retrieved.
   ' RETURN:
   '    The window class name.
   '*************************************************************
   Dim Buff As String
   Dim BuffSize As Integer
   Buff = String$(255, " ")
   BuffSize = apiGetClassName(hWnd, Buff, 255)
   GetWindowClass = left$(Buff, BuffSize)

End Function
 

How to Use the GetFormDimensions Sub Procedure

1. Open the sample database Northwind.mdb.



2. Add the following Sub procedure to the module that you created in step 2 of the previous section:




Sub MoveEmployeesAround()

   Dim frmCust As Form
   Dim frmEmp As Form
   Dim frmCustLeft As Long
   Dim frmCustTop As Long
   Dim frmCustWidth As Long
   Dim frmCustHeight  As Long
   Dim frmEmpLeft As Long
   Dim frmEmpTop As Long
   Dim frmEmpWidth As Long
   Dim frmEmpHeight  As Long
   
   Set frmCust = Forms!Customers
   Set frmEmp = Forms!Employees
   
   GetFormDimensions frmCust, frmCustLeft, frmCustTop, _
   frmCustWidth, frmCustHeight
   GetFormDimensions frmEmp, frmEmpLeft, frmEmpTop, _
   frmEmpWidth, frmEmpHeight
   
   frmEmp.SetFocus
   
   MsgBox "Move Employees to the right of Customers!"
   DoCmd.MoveSize frmCustLeft + frmCustWidth, frmCustTop
   
   MsgBox "Move Employees below Customers!"
   DoCmd.MoveSize frmCustLeft, frmCustTop + frmCustHeight

End Sub
 

3. Open the Customers and Employees forms in Form view.



4. Open the Immediate window by pressing CTRL+G. Type the following line, and then press ENTER:




MoveEmployeesAround 

5. In the message box that appears, click OK. The Employees form will be positioned immediately to the right of the Customers form, and then another message box will appear.



6. In the second message box, click OK. The Employees form will be positioned immediately below the Customers form.
   
   NOTE: Depending on the position and size of the Customers form, the Employees form may be positioned so that you cannot see it.

REFERENCES

For more information about the WindowHeight and WindowWidth properties, click Microsoft Access Help on the Help menu, type "WindowHeight" or "WindowWidth" in the Office Assistant or the Answer Wizard, and then click Search to view the topic.

Additional query words:

Keywords : kbdta AccCon FmsProp
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbinfo