ComboBox and automatic dropDown

[Peter Stojkovic]

VB 7.1 and windows.forms.

I have a comboBox on a form.
When the user goes with TAB-Key to the comboBox,
the comboBox should dropDown the ListBox automatically
and show ALL entries.
The user has no possibility to use a mouse !!

How can I program a automatic dropDown ( Showing all entries ),
if the user tabs to the comboBox ???
Thanks
for any help
Peter

[Marc Cramer]

Hello...
One solution is to write a custom control that inherits from the
combobox and listen for a specific message...

Private Const WM_SETFOCUS As Int32 = &H7

Protected Overrides Sub WndProc(ByRef m As System.Windows. Forms.Message)
MyBase.WndProc( m)
Select Case m.Msg
Case WM_SETFOCUS
Me.DroppedDown = True
Case Else
' do nothing...
End Select
End Sub
Also maybe Private Declare Function GetAsyncKeyStat e Lib "user32.dll " (ByVal vKey As Int32) As Short and check to see if the tab was down...? if so set droppeddown = true

Hope this helps...

Marc Cramer

Peter Stojkovic wrote: VB 7.1 and windows.forms.

I have a comboBox on a form.
When the user goes with TAB-Key to the comboBox,
the comboBox should dropDown the ListBox automatically
and show ALL entries.
The user has no possibility to use a mouse !!

How can I program a automatic dropDown ( Showing all entries ),
if the user tabs to the comboBox ???
Thanks
for any help
Peter

[Shiva]

Another option: Have SendKeys.Send ("{F4}") on the GotFocus event of the
dropdown.

"Peter Stojkovic" <Pe************ *@gmx.net> wrote in message
news:ut******** ******@TK2MSFTN GP12.phx.gbl...
VB 7.1 and windows.forms.

I have a comboBox on a form.
When the user goes with TAB-Key to the comboBox,
the comboBox should dropDown the ListBox automatically
and show ALL entries.
The user has no possibility to use a mouse !!

How can I program a automatic dropDown ( Showing all entries ),
if the user tabs to the comboBox ???
Thanks
for any help
Peter

[Shiva]

Yet another option: Have ComboBox.Droppe dDown = True in the GotFocus event
of that combo box.

"Peter Stojkovic" <Pe************ *@gmx.net> wrote in message
news:ut******** ******@TK2MSFTN GP12.phx.gbl...
VB 7.1 and windows.forms.

I have a comboBox on a form.
When the user goes with TAB-Key to the comboBox,
the comboBox should dropDown the ListBox automatically
and show ALL entries.
The user has no possibility to use a mouse !!

How can I program a automatic dropDown ( Showing all entries ),
if the user tabs to the comboBox ???
Thanks
for any help
Peter

[Cor Ligthert]

Peter,

Very quick and dirty
\\\
Private Sub ComboBox1_Enter (ByVal sender As Object, _
ByVal e As System.EventArg s) Handles ComboBox1.Enter
ComboBox1.DropD ownStyle = ComboBoxStyle.S imple
Me.ComboBox1.Si ze = New System.Drawing. Size(160, 152)
'size as you wish
End Sub
Private Sub ComboBox1_Leave (ByVal sender As Object, ByVal e _
As System.EventArg s) Handles ComboBox1.Leave
ComboBox1.DropD ownStyle = ComboBoxStyle.D ropDown
Me.TextBox1.Foc us() 'Next control or a nicer way
End Sub
///
I hope this helps?

Cor

"Peter Stojkovic" <Pe************ *@gmx.net>

VB 7.1 and windows.forms.

I have a comboBox on a form.
When the user goes with TAB-Key to the comboBox,
the comboBox should dropDown the ListBox automatically
and show ALL entries.
The user has no possibility to use a mouse !!

How can I program a automatic dropDown ( Showing all entries ),
if the user tabs to the comboBox ???
Thanks
for any help
Peter

[Herfried K. Wagner [MVP]]

"Peter Stojkovic" <Pe************ *@gmx.net> schrieb:

How can I program a automatic dropDown ( Showing all entries ),
if the user tabs to the comboBox ???

Add a handler to the control's 'Enter' event and set its 'DroppedDown'
property to 'True' there.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>