dotnet windows forms designtime: Resize control with Verbs -- dotnet windows forms designtime

Resize control with Verbs

Tom Juergens
2/16/2007 9:28:10 AM

dotnet windows forms designtime:

Hi,

I've written a very simple control designer with a few verbs which resize
the control it's assosciated with to a couple of default widths. When I use
the verbs to resize the control at design time the control itself is resized,
but the resize handles in the designer are not updated - they remain stuck at
the old size until I switch focus to another control and back. I can't figure
out how to get the resize handles to adjust immediately.

Can anyone help?

Thanks
Tom

To be specific:

<Designer(GetType(MyControlDesigner), GetType(IDesigner))> _
Public Class MyControl
Inherits TextBox
...
End Class

Public Class MyControlDesigner
Inherits ControlDesigner
...
Public Overrides ReadOnly Property Verbs() As DesignerVerbCollection
Get
If _verbs Is Nothing Then
_verbs = New DesignerVerbCollection()
_verbs.Add(New DesignerVerb("Maxi", New
EventHandler(AddressOf Maxi)))
_verbs.Add(New DesignerVerb("Mini", New
EventHandler(AddressOf Mini)))
End If
Return _verbs
End Get
End Property

Private Sub Maxi(ByVal sender As Object, ByVal args As EventArgs)
Me.Control.Width = 106
' Tried all sorts of things here...
End Sub

Private Sub Mini(ByVal sender As Object, ByVal args As EventArgs)
Me.Control.Width = 42
' Tried all sorts of things here...
End Sub

Re: Resize control with Verbs

Tom Juergens
2/17/2007 3:08:00 AM

Thanks for the tip, Sergey.

In case anyone else ever needs it: After changing the size I now use
IComponentChangeService to inform the designer of the changes, like this:

Private Sub Maxi(ByVal sender As Object, ByVal args As EventArgs)
Me.Control.Width = 140
Dim svc As IComponentChangeService = DirectCast _
(Me.GetService(GetType(IComponentChangeService)), _
IComponentChangeService)
svc.OnComponentChanged(Me.Control, Nothing, Nothing, Nothing)
End Sub

Thanks again.
Tom

[quoted text, click to view]

Re: Resize control with Verbs

Tom Juergens
2/17/2007 3:13:00 AM

One more note: Now I see that the documentation for the
IComponentChangeService.OnComponentChanged method recommends first calling
OnComponentChanging, then making the change, then calling
OnComponentChanged, so that's what I'll do.

Tom

[quoted text, click to view]

Re: Resize control with Verbs

Sergey M
2/17/2007 11:00:36 AM

[quoted text, click to view]

I meant calling OnComponentChanged as oppose to ComponentChanging, of
course. Sorry about that.
--
Sergey Mishkovskiy
http://www.usysware.com/dpack/ - DPack - free VS add-ons
http://www.usysware.com/blog/

Re: Resize control with Verbs

jetan NO[at]SPAM online.microsoft.com (
2/19/2007 12:00:00 AM

Hi Tom,

Yes, you are right.

Normally, we should fire OnComponentChanging before the component is
actually changed, and gives the designer a chance to abort the change or
perform any pre-change processing. And after making the changes, you may
call OnComponentChanged method.

.Net BCL designer classes also obey this rule. See the code of
Localize(IDesignTimeResourceWriter resourceWriter) method in
System.Web.UI.Design.ControlDesigner:

public void Localize(IDesignTimeResourceWriter resourceWriter)
{
string text1;
this.OnComponentChanging(base.Component, new
ComponentChangingEventArgs(base.Component, null));
string text2 = ControlLocalizer.LocalizeControl((Control)
base.Component, resourceWriter, out text1);
if (!string.IsNullOrEmpty(text2))
{
this.SetTagAttribute("meta:resourcekey", text2, true);
}
if (!string.IsNullOrEmpty(text1))
{
this._localizedInnerContent = text1;
}
this.OnComponentChanged(base.Component, new
ComponentChangedEventArgs(base.Component, null, null, null));
}

Anyway, if you need further help, please feel free to post, thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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