Access 2010 VBA Forms - Automatic Form Resize

I have complete my form to use around the office, however, when opened on different computers the form doesnt resize.Instead, the scroll bar appears. How can i make the form and controls automatically resize ?

回答1:

Here is some VBA code you could add to your form that will keep the form looking the same no matter how large or small the user has made the window on their monitor or what their monitor resolution is.

Also you can make the text larger or smaller by holding the Ctrl key and scrolling the mouse wheel up and down (or, alternatively, holding the Shift key and hitting the + key or the - key.)

To use this functionality, just open Access and open your form in design view. First, right-click on the image of the form and add the Form Header/Footer.

If you don't add the header and footer to the form, the code below will error out. However, you can shrink the height of both the header and the footer to nothing if you don't want them to appear on your form.

Select the Form itself by clicking the little box at the top left of the form, just below the tab:

This will make sure we are looking at the properties for the form itself when we view the Property Sheet.

To view the Property Sheet for the form (if it isn't visible already), hold the Alt key and press the Enter key.

Choose the Event tab.

You'll then need to add the literal text [Event Procedure] to the following five events behind the form itself:

On Load

On Key Up

On Key Down

On Resize

On Mouse Wheel

You can either type the literal text [Event Procedure] into the text box next to these events, or click the ellipsis (...) button next to each event and choose Code Builder from the pop up menu.

It will look something like this:

...

Also, at the bottom of the list of events, you'll also need to change the Key Preview property to Yes:

Finally, you'll probably want to turn Scroll Bars off on the form so that they don't overlap any content. To do this, go to the Format tab of the Property Sheet for your form in design view and change the Scroll Bars property to Neither.

Now, to add the VBA code, hold Alt and hit F11 to view the VBA editor.

Once inside the VBA editor, double click on the Form_YourFormName option under the Microsoft Access Class Objects folder:

If you do not see the Microsoft Access Class Objects folder, then go back to the form in design view and click the ellipsis (...) next to the literal text [Event Procedure] on any of the events you just modified.

This will take you back to the VBA editor and you should now be inside the Form_YourFormName code area. There will already be some code there, but you can erase all of it before proceeding to the next step.

Then in the main part of the screen on the right, just copy and paste the code below and you're done.

Option Compare Database
Option Explicit


'Set an unchangeable variable to the amount (10% for example) to increase or
'decrease the font size with each zoom, in or out.
Const FONT_ZOOM_PERCENT_CHANGE = 0.1


'Create the fontZoom and ctrlKeyIsPressed variables outside of
'the sub definitions so they can be shared between subs
Private fontZoom As Double
Private ctrlKeyIsPressed As Boolean


'Create an enum so we can use it later when pulling the data out of the "Tag" property
Private Enum ControlTag
    FromLeft = 0
    FromTop
    ControlWidth
    ControlHeight
    OriginalFontSize
    OriginalControlHeight
End Enum


Private Sub Form_Load()
    'Set the font zoom setting to the default of 100% (represented by a 1 below).
    'This means that the fonts will appear initially at the proportional size
    'set during design time. But they can be made smaller or larger at run time
    'by holding the "Shift" key and hitting the "+" or "-" key at the same time,
    'or by holding the "Ctrl" key and scrolling the mouse wheel up or down.
    fontZoom = 1

    'When the form loads, we need to find the relative position of each control
    'and save it in the control's "Tag" property so the resize event can use it
    SaveControlPositionsToTags Me
End Sub


Private Sub Form_Resize()
    'Set the height of the header and footer before calling RepositionControls
    'since it caused problems changing their heights from inside that sub.
    'The Tag property for the header and footer is set inside the SaveControlPositionsToTags sub
    Me.Section(acHeader).Height = Me.WindowHeight * CDbl(Me.Section(acHeader).Tag)
    Me.Section(acFooter).Height = Me.WindowHeight * CDbl(Me.Section(acFooter).Tag)

    'Call the RepositionControls Sub and pass this form as a parameter
    'and the fontZoom setting which was initially set when the form loaded and then
    'changed if the user holds the "Shift" key and hits the "+" or "-" key
    'or holds the "Ctrl" key and scrolls the mouse wheel up or down.
    RepositionControls Me, fontZoom
End Sub


Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)

    'PURPOSE: Make the text on the form bigger if "Shift" and "+" are pressed
    'at the same time and smaller if "Shift" and "-" are pressed at the same time.
    'NOTE: Using the "Ctrl" key instead of the "Shift" key conflicts with Access's
    'default behavior of using "Ctrl -" to delete a record, so "Shift" is used instead

    'Was the "Shift" key being held down while the Key was pressed?
    Dim shiftKeyPressed As Boolean
    shiftKeyPressed = (Shift And acShiftMask) > 0

    'If so, check to see if the user pressed the "+" or the "-" button at the
    'same time as the "Shift" key. If so, then make the font bigger/smaller
    'by the percentage specificed in the FONT_ZOOM_PERCENT_CHANGE variable.
    If shiftKeyPressed Then

        Select Case KeyCode
            Case vbKeyAdd
                fontZoom = fontZoom + FONT_ZOOM_PERCENT_CHANGE
                RepositionControls Me, fontZoom

                'Set the KeyCode back to zero to prevent the "+" symbol from
                'showing up if a textbox or similar control has the focus
                KeyCode = 0

            Case vbKeySubtract
                fontZoom = fontZoom - FONT_ZOOM_PERCENT_CHANGE
                RepositionControls Me, fontZoom

                'Set the KeyCode back to zero to prevent the "-" symbol from
                'showing up if a textbox or similar control has the focus
                KeyCode = 0

        End Select

    End If

    'Detect if the "Ctrl" key was pressed. This variable
    'will be used later when we detect a mouse wheel scroll event.
    If (Shift And acCtrlMask) > 0 Then
        ctrlKeyIsPressed = True
    End If

End Sub

Private Sub Form_KeyUp(KeyCode As Integer, Shift As Integer)
    'Change the ctrlKeyIsPressed variable to false when
    'any key is let up. This will make sure the form text does
    'not continue to grow/shrink when the mouse wheel is
    'scrolled after the ctrl key is pressed and let up.
    ctrlKeyIsPressed = False
End Sub


Private Sub Form_MouseWheel(ByVal Page As Boolean, ByVal Count As Long)
    'If the "Ctrl" key is also being pressed, then zoom the form in or out
    If ctrlKeyIsPressed Then
        Debug.Print ctrlKeyIsPressed
        'The user scrolled up, so make the text larger
        If Count < 0 Then

            'Make the font bigger by the percentage specificed
            'in the FONT_ZOOM_PERCENT_CHANGE variable
            fontZoom = fontZoom + FONT_ZOOM_PERCENT_CHANGE
            RepositionControls Me, fontZoom

        'The user scrolled down, so make the text smaller
        ElseIf Count > 0 Then

            'Make the font smaller by the percentage specificed
            'in the FONT_ZOOM_PERCENT_CHANGE variable
            fontZoom = fontZoom - FONT_ZOOM_PERCENT_CHANGE
            RepositionControls Me, fontZoom
        End If

    End If
End Sub


Public Sub SaveControlPositionsToTags(frm As Form)
On Error Resume Next

    Dim ctl As Control

    Dim ctlLeft As String
    Dim ctlTop As String
    Dim ctlWidth As String
    Dim ctlHeight As String
    Dim ctlOriginalFontSize As String
    Dim ctlOriginalControlHeight As String

    For Each ctl In frm.Controls

        'Find the relative position of this control in design view
        'e.g.- This control is 5% from the left, 10% from the top, etc.
        'Those percentages can then be saved in the Tag property for this control
        'and used later in the form's resize event
        ctlLeft = CStr(Round(ctl.Left / frm.Width, 4))
        ctlTop = CStr(Round(ctl.Top / frm.Section(ctl.Section).Height, 4))
        ctlWidth = CStr(Round(ctl.Width / frm.Width, 4))
        ctlHeight = CStr(Round(ctl.Height / frm.Section(ctl.Section).Height, 4))

        'If this control has a FontSize property, then capture the
        'control's original font size and the control's original height from design-time
        'These will be used later to calculate what the font size should be when the form is resized
        Select Case ctl.ControlType
            Case acLabel, acCommandButton, acTextBox, acComboBox, acListBox, acTabCtl, acToggleButton
                ctlOriginalFontSize = ctl.FontSize
                ctlOriginalControlHeight = ctl.Height
        End Select

        'Add all this data to the Tag property of the current control, separated by colons
        ctl.Tag = ctlLeft & ":" & ctlTop & ":" & ctlWidth & ":" & ctlHeight & ":" & ctlOriginalFontSize & ":" & ctlOriginalControlHeight

    Next

    'Set the Tag properties for the header and the footer to their proportional height
    'in relation to the height of the whole form (header + detail + footer)
    frm.Section(acHeader).Tag = CStr(Round(frm.Section(acHeader).Height / (frm.Section(acHeader).Height + frm.Section(acDetail).Height + frm.Section(acFooter).Height), 4))
    frm.Section(acFooter).Tag = CStr(Round(frm.Section(acFooter).Height / (frm.Section(acHeader).Height + frm.Section(acDetail).Height + frm.Section(acFooter).Height), 4))

End Sub


Public Sub RepositionControls(frm As Form, fontZoom As Double)
On Error Resume Next

    Dim formDetailHeight As Long
    Dim tagArray() As String

    'Since "Form.Section(acDetail).Height" usually returns the same value (unless the detail section is tiny)
    'go ahead and calculate the detail section height ourselves and store it in a variable
    formDetailHeight = frm.WindowHeight - frm.Section(acHeader).Height - frm.Section(acFooter).Height

    Dim ctl As Control

    'Loop through all the controls on the form
    For Each ctl In frm.Controls

        'An extra check to make sure the Tag property has a value
        If ctl.Tag <> "" Then

            'Split the Tag property into an array
            tagArray = Split(ctl.Tag, ":")

            If ctl.Section = acDetail Then
                'This is the Detail section of the form so use our "formDetailHeight" variable from above
                ctl.Move frm.WindowWidth * (CDbl(tagArray(ControlTag.FromLeft))), _
                                   formDetailHeight * (CDbl(tagArray(ControlTag.FromTop))), _
                                   frm.WindowWidth * (CDbl(tagArray(ControlTag.ControlWidth))), _
                                   formDetailHeight * (CDbl(tagArray(ControlTag.ControlHeight)))
            Else
                ctl.Move frm.WindowWidth * (CDbl(tagArray(ControlTag.FromLeft))), _
                                   frm.Section(ctl.Section).Height * (CDbl(tagArray(ControlTag.FromTop))), _
                                   frm.WindowWidth * (CDbl(tagArray(ControlTag.ControlWidth))), _
                                   frm.Section(ctl.Section).Height * (CDbl(tagArray(ControlTag.ControlHeight)))
            End If

            'Now we need to change the font sizes on the controls.
            'If this control has a FontSize property, then find the ratio of
            'the current height of the control to the form-load height of the control.
            'So if form-load height was 1000 (twips) and the current height is 500 (twips)
            'then we multiply the original font size * (500/1000), or 50%.
            'Then we multiply that by the fontZoom setting in case the user wants to
            'increase or decrease the font sizes while viewing the form.
            Select Case ctl.ControlType
                Case acLabel, acCommandButton, acTextBox, acComboBox, acListBox, acTabCtl, acToggleButton
                    ctl.FontSize = Round(CDbl(tagArray(ControlTag.OriginalFontSize)) * CDbl(ctl.Height / tagArray(ControlTag.OriginalControlHeight))) * fontZoom
            End Select

        End If

    Next

End Sub

Here are some screenshots of what a form looks like when shrunk.

Before:

After:

Also, you can make the text larger by holding the Ctrl key and scrolling the mouse wheel up (or, alternatively by holding the Shift key and pressing the + key.)

And, you can make the text smaller by holding the Ctrl key and scrolling the mouse wheel down (or, alternatively by holding the Shift key and pressing the - key.)

回答2:

A few notes:

Have a look at how to anchor controls to the form so they can resize with the form.
Design your forms so they display properly on the smallest screensize that your users have.
It's important that you think about how your users will interact with your application. You cannot expect Access to magically reflow and resize everything, it's something you, as the designer of the application, need to think about.
So limit the number of controls on your form, and keep them small enough that they display correctly on whatever is the smallest reasonable screen resolution in your office.
If you do not want bars to appear, look at the form's scrollbars properties.
Look into the various form styles you can use: in Access 2007 and above, you can use forms in tabs. You can also make them popup, and prevent them from being resized.
Look into the following form properties and play around the various combinations to get the desired effect: