Visual Basic Source Code/Visual Basic Source Code.iso/vbsource/resize2a/resizer.ctl

Text File | 1998-10-14 | 9KB | 339 lines

VERSION 5.00
Begin VB.UserControl Resizer
   ClientHeight    =   480
   ClientLeft      =   0
   ClientTop       =   0
   ClientWidth     =   495
   InvisibleAtRuntime=   -1  'True
   ScaleHeight     =   480
   ScaleWidth      =   495
   ToolboxBitmap   =   "Resizer.ctx":0000
   Begin VB.Image Image1
      Height          =   480
      Left            =   0
      Picture         =   "Resizer.ctx":0182
      Top             =   0
      Width           =   480
   End
End
Attribute VB_Name = "Resizer"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
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

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
Attribute ParentForm.VB_VarHelpID = -1

' 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

  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()

  ' 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)

  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()

  ' refuse to resize '
  Image1.Move 0, 0
  UserControl.Width = Image1.Width
  UserControl.Height = Image1.Height

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()

  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()

  ' 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)

     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 Changes.AllowChangeTop = True Then
                       .Width = ctrl.Width
'                     End If
'                     If Changes.AllowChangeTop = True Then
                       .Height = ctrl.Height
'                     End If
                     .FontSize = ctrl.Font.Size
     End With

  Next

End Sub

'''''''''''''''''''''''''''''''''''''''''''''''''''''''
' update size and position of controls on parent form '
'''''''''''''''''''''''''''''''''''''''''''''''''''''''
Sub Refresh()

  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)

                     ' 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

                     ' 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