Net_Resize.CTL
Option Explicit
' if True, also fonts are resized '
Public ResizeFont As Boolean
' if True, form's height/width ratio is preserved '
Public KeepRatio As Boolean
Private Type TControlInfo
ctrl As Control
Left As Single
Top As Single
Width As Single
Height As Single
FontSize As Single
Tag As String
End Type
Private Type TAllowChanges
AllowChangeTop As Boolean
AllowChangeLeft As Boolean
AllowChangeWidth As Boolean
AllowChangeHeight As Boolean
End Type
' this array holds the original position '
' and size of all controls on parent form '
Dim Controls() As TControlInfo
' a reference to the parent form '
Private WithEvents ParentForm As Form
' parent form's size at load time '
Private ParentWidth As Single
Private ParentHeight As Single
' ratio of original height/width '
Private HeightWidthRatio As Single
Private Function CheckForChanges(ByVal TagToUse As String) As TAllowChanges
On Error Resume Next
Dim ChangesToAllow As TAllowChanges
ChangesToAllow.AllowChangeTop = True
ChangesToAllow.AllowChangeLeft = True
ChangesToAllow.AllowChangeWidth = True
ChangesToAllow.AllowChangeHeight = True
If TagToUse <> "" Then
If UCase(Left(TagToUse, 9)) = "MSIRESIZE" Then
ChangesToAllow.AllowChangeTop = False
ChangesToAllow.AllowChangeLeft = False
ChangesToAllow.AllowChangeWidth = False
ChangesToAllow.AllowChangeHeight = False
If Mid(TagToUse, 10, 1) = "Y" Then
ChangesToAllow.AllowChangeLeft = True
End If
If Mid(TagToUse, 11, 1) = "Y" Then
ChangesToAllow.AllowChangeTop = True
End If
If Mid(TagToUse, 12, 1) = "Y" Then
ChangesToAllow.AllowChangeWidth = True
End If
If Mid(TagToUse, 13, 1) = "Y" Then
ChangesToAllow.AllowChangeHeight = True
End If
End If
End If
CheckForChanges = ChangesToAllow
End Function
Private Sub ParentForm_Load()
On Error Resume Next
' the ParentWidth variable works as a flag '
ParentWidth = 0
' save original ratio '
HeightWidthRatio = ParentForm.Height / ParentForm.Width
End Sub
Private Sub UserControl_ReadProperties(PropBag As PropertyBag)
On Error Resume Next
ResizeFont = PropBag.ReadProperty("ResizeFont", False)
KeepRatio = PropBag.ReadProperty("KeepRatio", False)
If Ambient.UserMode = False Then
Exit Sub
End If
' store a reference to the parent form and start receiving events '
Set ParentForm = Parent
End Sub
Private Sub UserControl_Resize()
On Local Error Resume Next
UserControl.Width = 480
UserControl.Height = 480
End Sub
''''''''''''''''''''''''''''''''''''''''''''
' trap the parent form's Resize event '
' this include the very first resize event '
' that occurs soon after form's load '
''''''''''''''''''''''''''''''''''''''''''''
Private Sub ParentForm_Resize()
On Error Resume Next
If ParentWidth = 0 Then
Rebuild
Else
Refresh
End If
End Sub
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' save size and position of all controls on parent form '
' you should manually invoke this method each time you add a new control '
' to the form (through Load method of a control array) '
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Sub Rebuild()
On Error Resume Next
' rebuild the internal table
Dim i As Integer
Dim ctrl As Control
' Dim Changes As TAllowChanges
' this is necessary for controls that don't support
' all properties (e.g. Timer controls)
On Error Resume Next
If Ambient.UserMode = False Then
Exit Sub
End If
' save a reference to the parent form, and its initial size
Set ParentForm = UserControl.Parent
ParentWidth = ParentForm.ScaleWidth
ParentHeight = ParentForm.ScaleHeight
' read the position of all controls on the parent form
ReDim Controls(ParentForm.Controls.Count - 1) As TControlInfo
For i = 0 To ParentForm.Controls.Count - 1
Set ctrl = ParentForm.Controls(i)
' Changes = CheckForChanges(ctrl)
Controls(i).Tag = ctrl.Tag
With Controls(i)
Set .ctrl = ctrl
' If Changes.AllowChangeLeft = True Then
.Left = ctrl.Left
' End If
' If Changes.AllowChangeTop = True Then
.Top = ctrl.Top
' End If
If .Tag = "" Then
' If Changes.AllowChangeTop = True Then
.Width = ctrl.Width
' End If
' If Changes.AllowChangeTop = True Then
.Height = ctrl.Height
' End If
.FontSize = ctrl.Font.Size
End If
End With
Next
End Sub
'''''''''''''''''''''''''''''''''''''''''''''''''''''''
' update size and position of controls on parent form '
'''''''''''''''''''''''''''''''''''''''''''''''''''''''
Sub Refresh()
On Error Resume Next
Dim i As Integer
Dim ctrl As Control
Dim minFactor As Single
Dim widthFactor As Single
Dim heightFactor As Single
Dim Changes As TAllowChanges
' inhibits recursive calls if KeepRatio = True '
Static executing As Boolean
If executing Then
Exit Sub
End If
If Ambient.UserMode = False Then
Exit Sub
End If
If KeepRatio Then
executing = True
' we must keep original ratio '
ParentForm.Height = HeightWidthRatio * ParentForm.Width
executing = False
End If
' this is necessary for controls that don't support '
' all properties (e.g. Timer controls) '
On Error Resume Next
widthFactor = ParentForm.ScaleWidth / ParentWidth
heightFactor = ParentForm.ScaleHeight / ParentHeight
' take the lesser of the two '
If widthFactor < heightFactor Then
minFactor = widthFactor
Else
minFactor = heightFactor
End If
' this is a regular resize '
For i = 0 To UBound(Controls)
Changes = CheckForChanges(Controls(i).ctrl.Tag)
With Controls(i)
' move and resize the controls - we can't use a Move '
' method because some controls do not support the change '
' of all the four properties (e.g. Height with comboboxes) '
If Changes.AllowChangeLeft = True Then
.ctrl.Left = .Left * widthFactor
End If
If Changes.AllowChangeTop = True Then
.ctrl.Top = .Top * heightFactor
End If
If .Tag = "" Then
' the change of font must occur *before* the resizing '
' to account for companion scrollbar of listbox '
' and other similar controls '
If ResizeFont Then
.ctrl.Font.Size = .FontSize * minFactor
End If
If Changes.AllowChangeWidth = True Then
.ctrl.Width = .Width * widthFactor
End If
If Changes.AllowChangeHeight = True Then
.ctrl.Height = .Height * heightFactor
End If
End If
End With
Next
End Sub
Private Sub UserControl_WriteProperties(PropBag As PropertyBag)
Call PropBag.WriteProperty("ResizeFont", ResizeFont, False)
Call PropBag.WriteProperty("KeepRatio", KeepRatio, False)
End Sub
Form1.FRM
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