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Providing a Graphical Calendar
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You can always provide an input mask to help a user enter a date and time value correctly, but it s much more helpful if the user can choose the date using a graphical calendar. Both the 867
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Part 5: Automating an Access Application
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Microsoft Office Access 2003 Inside Out LawTrack Contacts and the Housing Reservations sample applications provide this enhancement. The two applications actually have two different versions of a calendar form one that employs the Calendar ActiveX control (frmCalendarOCX), and a second (frmCalendar) that uses Visual Basic code to draw the calendar on a form using an option group and toggle button controls. This graphical facility is available in the sample applications wherever you see a small command button next to a date or date/time field on a form. Click the button to open the calendar and set the value. One date field that uses the ActiveX version of the calendar is the Birth Date field on the frmContacts form. You can see the open calendar in Figure 23-5.
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Part 1: Part Title
23 23 22 23 23 23
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Figure 23-5. Providing a graphical interface to set a date value.
The code in the Click event of this command button calls a public function to open the form and pass it the related control that should receive the resulting date value. You can find this code in the module for the frmContacts form as shown below.
Private Sub cmdContactBirthCal_Click() Dim varReturn As Variant Clicked the calendar icon asking for graphical help Put the focus on the control to be updated Me.BirthDate.SetFocus Call the get a date function varReturn = GetDateOCX(Me.BirthDate, True) End Sub
When the user clicks the command button, Access moves the focus to it. The code moves the focus back to the date field to be edited and calls the public function where the real action happens. You can find the code for the function GetDateOCX in the modCalendar module, and the code is also listed below.
Option Compare Database Option Explicit Place holder for the form class Dim frmCalOCX As Form_frmCalendarOCX
Part 5: Automating an Access Application
Automating Your Application with Visual Basic
End Declarations Section Function GetDateOCX(ctlToUpdate As Control, _ Optional intDateOnly As Integer = 0) ---------------------------------------------------------- Inputs: A Control object containing a date/time value Optional "date only" (no time value) flag Outputs: Sets the Control to the value returned by frmCalendar Created By: JLV 11/15/02 Last Revised: JLV 11/15/02 ---------------------------------------------------------- Set an error trap On Error GoTo ProcErr Open the OCX calendar form by setting a new object NOTE: Uses a module variable in the Declarations section so that the form doesn t go away when this code exits Set frmCalOCX = New Form_frmCalendarOCX Call the calendar form s public method to pass it the control to update and the "date only" flag Set frmCalOCX.ctlToUpdate(intDateOnly) = ctlToUpdate Put the focus on the OCX calendar form frmCalOCX.SetFocus ProcExit: Done Exit Function ProcErr: MsgBox "An error has occurred in GetDateOCX. " _ & "Error number " & Err.Number & ": " & Err.Description _ & vbCrLf & vbCrLf & _ "If this problem persists, note the error message and " _ & "call your programmer.", , "Oops . . . (unexpected error)" Resume ProcExit End Function
The function begins by setting an error trap that executes the code at the ProcErr label if anything goes wrong. You might remember from the previous chapter that you can open a form that has code behind it by setting an object to a new instance of the form s class module. This is exactly what this function does to get the form open. In addition, it calls the Property Set procedure for the form s ctlToUpdate property to pass it the control object that should be updated after the user picks a date value. The function also passes along an optional variable to indicate whether the control needs a date and time or a date only (intDateOnly). Once the calendar form is open and has the control it needs to update, this function is finished. Notice that the object variable used to open the form is declared in this module s Declarations section. It cannot be declared inside the function because the variable would go out of scope (and the form would close) when the GetDateOCX function exits. The final pieces of code that make this all work are in the module behind the frmCalendarOCX form. You see the portion of the code that initializes the form listed below.
Option Compare Database Option Explicit This form demonstrates both using a custom control (MSCal.OCX) and manipulating a Class via Property Set
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