Version 1.1           Approx 0.8 MB (zipped)                 First Published 19 Mar 2024


My Attention Seeking example database demonstrates several ways of focusing users' attention on a specific form on the screen with minimal effort.

These include scrolling or flashing text, blurring, dimming or removing the background.

This article discusses how to dim or remove the background by changing its opacity. For example, in the screenshot below, the backgound has an opacity of 80%. Background objects cannot be clicked.


I have used this approach in several of my example apps such as Application Tips and Move / Resize Selected Columns
However, until now I have not explained how it works in any detail.

The dimmimg effect is achieved using a background form, frmDimmer. The highlighted form must be a popup and requires just two lines of code.



Download

Click to download:       Highlight Entire Form v1.1      ACCDB file       Approx 0.8 MB (zipped)

Download and unblock the zip file. For more details, see my article: Unblock downloaded files by removing the Mark of the Web

Unzip and save the ACCDB file to a trusted location.



How the Example App works

The app opens to a startup form. This includes a combo box which can be used to adjust the opacity value


When you click the Open Popup Form button, the background is automatically dimmed:


This is achieved by overlaying the entire screen with a form frmDimmer which applies the specified opacity. In this case 80%.

The highlighted form MUST be a popup so that is is independent of the application interface and therefore unaffected by the dimming effect.
Just one line of code is required in the Form_Load event of the highlighted form: Form_frmDimmer.DoDim Me

When the highlighted form is closed, the dimming effect is removed using just one line of code in the Form_Unload event: Form_frmDimmer.UnDim

The effect of altering the opacity can easily be tested by altering the combo value on the start form. For example, set to 40%:


If the value is set to 100%, the background is completely blacked out


All the code needed to achieve this is contained in form frmDimmer. The code isn't mine, but unfortunately I don't know the author's name.

The code is fairly complex and uses several APIs to achieve this effect. However, you do not need to understand the code in order to use it.
Just import the form frmDimmer into your own application and add the two code lines listed above to the popup form load / unload events.

Choose the opacity value that works best for you. In this example app, this is set using the combo and stored in tblSettings.
The function GetOpacity in modFunctions retrieves the stored value

The following code is used in frmDimmer:

CODE:

'Form declarations section Private TargetOpacity As Integer
Private Const StepSize = 3

'================================

Private Sub Form_Load()

      ' Fill screen
      Me.Move 0, 0, modMetrics.AccessAppInsideSize.Width, modMetrics.AccessAppInsideSize.Height

      ' Opacity can't be set until Visible=True
      Me.Visible = True

      SetOpacity Me, 0
      DoCmd.Maximize

End Sub

'================================

Private Sub Form_Current()

Dim Opacity As Integer

      For Opacity = 0 To TargetOpacity Step StepSize
            SetOpacity Me, (Opacity)
            DoEvents
      Next Opacity

End Sub

'================================

Public Sub SetOpacity(frm As Access.Form, AlphaPercent As Byte)

      If frm.PopUp Then
            'set opacity value from tblSettings
            'disable if using the constant value
            TargetOpacity = GetOpacity       'function in modFunctions

            'more code here to set form alpha value and extended attributes. . .

      End If

End Sub

If preferred, you can instead set the opacity as a constant in the declarations section of frmDimmer:

Private Const TargetOpacity = 80       '50 etc

If you do this, remove the line Private TargetOpacity As Integer from the declarations section together with the line TargetOpacity = GetOpacity from the SetOpacity procedure.

NOTE:
It is VERY important that users do NOT open frmDimmer directly from the navigation pane as doing that would make the application unresponsive

Attempting to open the form directly, triggers this message:


This is done by using the following code in the Form_Open event:

Private Sub Form_Open(Cancel As Integer)

      If Application.CurrentObjectName = Me.Name Then
            FormattedMsgBox "This form is designed to be used in conjunction with other forms. " & vbCrLf & _
                  "@It cannot be opened directly from the navigation pane @", vbExclamation, "Action not allowed!"
            Cancel = True
            Exit Sub
      End If

End Sub

Video

I have created a YouTube video (6:18) to accompany this article:

You can watch the Highlight Entire Form (Dim Background) video on my Isladogs YouTube channel or you can click below:



If you liked the video, please subscribe to my Isladogs on Access channel on YouTube. Thanks.



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Colin Riddington           Mendip Data Systems                 Last Updated 19 Mar 2024

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