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Item Type: NewsGroup Date Entered: 6/20/2005 8:32:16 PM Date Modified: Subscribers: 0 Subscribe Alert
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ultraman69
Asp.Net User
Composite control event problem6/20/2005 8:32:16 PM

0/0

Hi everyone !

I'm trying to build a cutom toolbar control. I used a simple table with ImageButton. Then I created an event linked to each of the buttons so that the client will know which button has been clicked. So far, everything is working fine, BUT....

I also defined properties where the client can set the images of the buttons (using the ViewState). One for the enabled button and another one if the button is disabled. If I trap a click event on the client page and try to change the "Enabled" value of my button to "False" (so that it displays the "disabled" image) the control is not displaying the correct image. It's all because events are processed AFTER the CreateChildControl method. So the control is already drawn before the click event is raised.

ToolControl code :

Public Event FirstClick As EventHandler

' Invoke the delegates

'*******************************************

Protected Overridable Sub OnFirstClick(ByVal e As EventArgs)

RaiseEvent FirstClick(Me, e)

End Sub

Private Sub btnFirst_Click(ByVal Sender As Object, ByVal E As ImageClickEventArgs)

OnFirstClick(ImageClickEventArgs.Empty)

End Sub



Protected Overrides Sub CreateChildControls()

....Some code here.....

If Me.ButtonFirstVisible Then

         Me.Controls.Add(New LiteralControl(vbTab & vbTab & "<td id='btnFirst' onmouseover=" & Chr(34) & "ChangeColor(0, this.id)" & Chr(34) & " onmouseout=" & Chr(34) & "ChangeColor(1, this.id)" & Chr(34) & ">"))

         Dim btnFirst As New ImageButton

         If Me.ButtonFirstEnabled And Not Me.ImgSrcDisabledFirst = "" Then

               btnFirst.ImageUrl = Me.ImgSrcFirstButton

         Else

               btnFirst.ImageUrl = Me.ImgSrcDisabledFirst

         End If

         btnFirst.ImageAlign = ImageAlign.Middle

         btnFirst.ToolTip = strFirst

         AddHandler btnFirst.Click, AddressOf btnFirst_Click

         Me.Controls.Add(btnFirst)

         Me.Controls.Add(New LiteralControl("</td>" & vbCrLf))

End If

...Rest of the code here.....

End Sub


Client page code :

Private Sub ToolControl1_FirstClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ToolControl1.FirstClick

ToolControl1.ButtonFirstEnabled = False

End Sub


I even tried to remove all controls in the ToolControl "btnFirst_Click" method before recalling "CreateChildControl". It works, but the next button I click don't raise the event. I have no idea why.

Is there some kind of workaround for this kind of things ?
_________________________________________

Ultraman69
ultraman69
Asp.Net User
Re: Composite control event problem6/21/2005 2:06:53 PM

0/0

Well, if anyone's interested, here's what solved my problem : I cleared all controls after the event was fired and then I recreated them. It is totally not performant, but it's the only way I found to make it work.

ToolControl code :

Private Sub btnFirst_Click(ByVal Sender As Object, ByVal E As ImageClickEventArgs)

     OnFirstClick(ImageClickEventArgs.Empty)

     Controls.Clear()

     ClearChildViewState()

     Me.CreateChildControls()

End Sub

_________________________________________

Ultraman69
2 Items, 1 Pages 1 |< << Go >> >|


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