Question

ComboBoxes highlited after resizing?

Asked by: Ark

After resizing winform with a nuber of databound comboboxes (Style=DropDown, Autocomplete=SuggestAppend) with an anchor set to left,top,right all them resized properly but all get highlighted. Is this a bug or future? Currently I use:

    Private Sub frmMain_Resize(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Resize
        UnHighlightCombos(Me)
    End Sub

    Private Sub UnHighlightCombos(ByVal ctrlParent As Control)
        For Each ctrl As Control In ctrlParent.Controls()
            If TypeOf ctrl Is ComboBox Then
                If Not ctrl.Focused Then
                    CType(ctrl, ComboBox).SelectionLength = 0
                End If
            Else
                If ctrl.Controls.Count > 0 Then
                    UnHighlightCombos(ctrl)
                End If
            End If
        Next
    End Sub

but this way you can see blinking selection over combo's. Is there a better way to bypass this 'future'?

Thanks
Ark

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Asked On
2007-08-04 at 22:25:38ID22742524
Tags

resize

Topic

Microsoft Visual Basic.Net

Participating Experts
1
Points
250
Comments
4

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Answers

 

by: Idle_MindPosted on 2007-08-05 at 09:49:03ID: 19634623

Hi Ark,

Try something like this out...

Public Class Form1

    Private combos As New ArrayList
    Private Const WM_ENTERSIZEMOVE As Integer = &H231&
    Private Const WM_EXITSIZEMOVE As Integer = &H232

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        GetCombos(Me)
    End Sub

    Private Sub GetCombos(ByVal ctrlParent As Control)
        For Each ctrl As Control In ctrlParent.Controls()
            If TypeOf ctrl Is ComboBox Then
                combos.Add(New MyComboBox(ctrl))
            Else
                If ctrl.Controls.Count > 0 Then
                    GetCombos(ctrl)
                End If
            End If
        Next
    End Sub

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        Select Case m.Msg
            Case WM_ENTERSIZEMOVE
                MyComboBox.SuppressSetText = True

            Case WM_EXITSIZEMOVE
                MyComboBox.SuppressSetText = False

        End Select

        MyBase.WndProc(m)
    End Sub

    Private Class MyComboBox
        Inherits NativeWindow

        Private Const WM_GETTEXTLENGTH As Integer = &HE
        Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As IntPtr, ByVal hWnd2 As IntPtr, ByVal lpsz1 As String, ByVal lpsz2 As String) As IntPtr

        Public Shared SuppressSetText As Boolean = False

        Public Sub New(ByVal cb As ComboBox)
            Dim editWnd As IntPtr = FindWindowEx(cb.Handle, IntPtr.Zero, "Edit", vbNullString)
            If Not editWnd.Equals(IntPtr.Zero) Then
                Me.AssignHandle(editWnd)
            End If
        End Sub

        Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
            If MyComboBox.SuppressSetText Then
                Select Case m.Msg
                    Case WM_GETTEXTLENGTH
                        Return ' Suprress the message

                End Select
            End If
            MyBase.WndProc(m)
        End Sub

    End Class

End Class

 

by: ArkPosted on 2007-08-05 at 15:14:55ID: 19635490

Thanks, Idle
Small addition:

    Private Const WM_SIZE As Integer = &H5& 'To handle Maximizing/restoring
'..................
  Case WM_ENTERSIZEMOVE, WM_SIZE
'.................

 

by: ArkPosted on 2007-08-05 at 16:01:46ID: 19635615

PS
I'm woundering how long programmers will 'dance like monkey' around MS bugs? Here are some handlers from my app:
#Region " Event handlers"
    'Handles MS bug (KB327244) - ComboBox Does Not Clear When You Set SelectedIndex to -1
    Private Sub HadleComboMS_Bug(ByVal sender As Object, ByVal e As System.EventArgs)
        If bFromCode Then Exit Sub
        Dim cbo As ComboBox = CType(sender, ComboBox)
        If cbo.SelectedIndex = -1 Then
            bFromCode = True
            cbo.SelectedIndex = 0
            cbo.SelectedIndex = -1
            bFromCode = False
        End If
    End Sub
   
 'Handles MS bug (KB313513) - PRB: InvalidCastException When You Bind DateTimePicker That Contains a Null Value
    Private Sub DTFormatter(ByVal sender As Object, ByVal e As ConvertEventArgs)
        If Not e.DesiredType Is GetType(DateTime) Then Return
        If e.Value.GetType Is GetType(System.DBNull) Then e.Value = CType("1/1/1800", System.DateTime)
    End Sub
   
 'Handles MS bug (KB313513) - PRB: InvalidCastException When You Bind DateTimePicker That Contains a Null Value
    Private Sub DTParser(ByVal sender As Object, ByVal e As ConvertEventArgs)
        If Not e.DesiredType Is GetType(DateTime) Then Return
        If Not e.Value.GetType Is GetType(DateTime) Then Return
        Dim value As String = CType(e.Value, String)
        If value.Equals("1/1/1800") Then e.Value = System.DBNull.Value
    End Sub

 

by: Idle_MindPosted on 2007-08-05 at 17:56:26ID: 19635881

You're welcome!  Glad to solve a problem that actually required a little thought and tinkering...  ;)

But I wholeheartedly agree...it is unfortunate that coders have to spend extra time writing "hacks" to fix things that should work correctly "out of the box".  =\

20120131-EE-VQP-002

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