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Class Wrapper Event Handling

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ToolBar

This is a migrated thread and some comments may be shown as answers.

NW7US asked on 07 Sep 2012, 08:52 PM

Hello.

I am creating a class that wraps around a RadToolBar. The RadToolBar is dynamically created, with the exception that an empty toolbar is defined in the aspx code (example below). The class allows me to access buttons and a text box with simple class functions, properties, etc. Works nicely.

What I am stuck on is that I wish to handle button click events IN this class, allowing the new handlers to be then handled by the user in the .vb server-side code with the "handles" process (example idea, below). I know that I am on the track to figure this out, but I cannot seem to find the right solution.

So, here is the aspx:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="projects.aspx.vb" Inherits="EPD_WEB_APP.projects" %>

<%@ Import Namespace="EPD_WEB_APP" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Charting" TagPrefix="telerik" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title>Test</title>

</head>

<body style="height: 830px; width: 630px">

<form id="form1" runat="server">

<div style="height: 821px; width: 1392px; margin-right: 0px;">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

</telerik:RadScriptManager>

<br />

<telerik:RadToolBar ID="RadToolBar1" runat="server" Skin="Default"

AutoPostBack="True">

</telerik:RadToolBar>

<br />

<asp:Label ID="txtSearchFieldContents" runat="server" Text="Result:"></asp:Label>

</div>

</form>

</body>

</html>

And, here is the toolbar class which wraps around the toolbar:

Public Class tToolBar

Private m_RadToolBar As RadToolBar

Private m_ThisPage As System.Web.UI.Page

Private m_Skin As String

Private m_SearchText As String

Public Sub New(ByVal RadToolBar As RadToolBar)

m_RadToolBar = RadToolBar

m_ThisPage = HttpContext.Current.Handler

m_SearchText = ""

m_Skin = m_RadToolBar.Skin

If Not m_ThisPage.IsPostBack Then

Dim btnAdd As New RadToolBarButton()

btnAdd.Text = "Add"

btnAdd.Value = "1"

btnAdd.ImageUrl = "Images/AddRecord.gif"

'btnAdd.CheckOnClick = True

m_RadToolBar.Items.Add(btnAdd)

Dim btnEdit As New RadToolBarButton()

btnEdit.Text = "Edit"

btnEdit.Value = "2"

'btnEdit.CheckOnClick = True

btnEdit.ImageUrl = "Images/Edit.gif"

m_RadToolBar.Items.Add(btnEdit)

Dim buttonS1 As New RadToolBarButton()

buttonS1.IsSeparator = True

m_RadToolBar.Items.Add(buttonS1)

Dim btnSave As New RadToolBarButton()

btnSave.Text = "Save"

btnSave.Value = "3"

btnSave.ImageUrl = "Images/Save.gif"

m_RadToolBar.Items.Add(btnSave)

Dim btnCancel As New RadToolBarButton()

btnCancel.Text = "Cancel"

btnCancel.Value = "4"

btnCancel.ImageUrl = "Images/Cancel.gif"

m_RadToolBar.Items.Add(btnCancel)

Dim btnDelete As New RadToolBarButton()

btnDelete.Text = "Delete"

btnDelete.Value = "5"

btnDelete.ImageUrl = "Images/deletex.gif"

m_RadToolBar.Items.Add(btnDelete)

Dim buttonS2 As New RadToolBarButton()

buttonS2.IsSeparator = True

m_RadToolBar.Items.Add(buttonS2)

Dim ddSearchBy As New RadToolBarSplitButton()

ddSearchBy.Text = "Search By..."

ddSearchBy.ToolTip = "Select the type of search."

Dim btnUPC As New RadToolBarButton()

btnUPC.ToolTip = "Select the type of search."

btnUPC.Text = "UPC"

btnUPC.Value = "UPC"

Dim btnDesc As New RadToolBarButton()

btnDesc.ToolTip = "Select the type of search."

btnDesc.Text = "Description"

btnDesc.Value = "DESC"

ddSearchBy.Buttons.Add(btnUPC)

ddSearchBy.Buttons.Add(btnDesc)

m_RadToolBar.Items.Add(ddSearchBy)

'Dim splitButton As New RadToolBarSplitButton()

Dim btnSearchByTxt As New RadToolBarButton()

btnSearchByTxt.Text = "Search for?"

m_RadToolBar.Items.Add(btnSearchByTxt)

Dim btnSearch As New RadToolBarButton()

btnSearch.Text = "Search"

btnSearch.Value = "6"

btnSearch.ImageUrl = "Images/search.gif"

m_RadToolBar.Items.Add(btnSearch)

Dim buttonS3 As New RadToolBarButton()

buttonS3.IsSeparator = True

m_RadToolBar.Items.Add(buttonS3)

Dim btnFirst As New RadToolBarButton()

btnFirst.Text = "First"

btnFirst.Value = "8"

btnFirst.ImageUrl = "Images/blue-first-16.gif"

m_RadToolBar.Items.Add(btnFirst)

Dim btnPrev As New RadToolBarButton()

btnPrev.Text = "Previous"

btnPrev.Value = "9"

btnPrev.ImageUrl = "Images/blue-prev-16.gif"

m_RadToolBar.Items.Add(btnPrev)

Dim btnNext As New RadToolBarButton()

btnNext.Text = "Next"

btnNext.Value = "10"

btnNext.ImageUrl = "Images/blue-next-16.gif"

m_RadToolBar.Items.Add(btnNext)

Dim btnLast As New RadToolBarButton()

btnLast.Text = "Last"

btnLast.Value = "11"

btnLast.ImageUrl = "Images/blue-last-16.gif"

m_RadToolBar.Items.Add(btnLast)

Disable()

End If

InstantiateSearch()

End Sub

Public Property Skin() As String

Get

Return m_Skin

End Get

Set(ByVal value As String)

m_Skin = value

m_RadToolBar.Skin = m_Skin

End Set

End Property

Public Property SearchText() As String

Get

m_SearchText = ""

Dim textItem As RadToolBarItem = m_RadToolBar.FindItemByText("Search for?")

Dim textBox As TextBox = CType(textItem.FindControl("TextBox"), TextBox)

m_SearchText = textBox.Text

Return m_SearchText

End Get

Set(ByVal value As String)

m_SearchText = value

Dim textItem As RadToolBarItem = m_RadToolBar.FindItemByText("Search for?")

Dim textBox As TextBox = CType(textItem.FindControl("TextBox"), TextBox)

textBox.Text = m_SearchText

End Set

End Property

Public Sub InstantiateSearch()

Dim searchTemplate As New TextBoxSearchTemplate()

Dim textSearchItem As RadToolBarItem = m_RadToolBar.FindItemByText("Search for?")

If TypeOf textSearchItem Is RadToolBarButton Then

searchTemplate.InstantiateIn(textSearchItem)

End If

m_RadToolBar.DataBind()

End Sub

Public Sub Disable(Optional ByVal scope As String = "")

If scope = "All" Or scope = "" Then

m_RadToolBar.Enabled = False

End If

' other options may exist...

End Sub

Public Sub Enable(Optional ByRef scope As String = "")

If scope = "All" Or scope = "" Then

m_RadToolBar.Enabled = True

End If

' other options may exist...

End Sub

'Protected Sub SearchButton_Click(ByVal sender As Object, ByVal e As EventArgs)

'----- some way of handling the bar's click, and then inside, which button was clicked, like the "Search" button.

'----- this needs to be then handled by the user who is using the class with a tToolBar.OnClick something...

'End Sub

Private Class TextBoxSearchTemplate

Implements ITemplate

Public Sub InstantiateIn(ByVal container As Control) Implements ITemplate.InstantiateIn

Dim txtbox1 As New TextBox()

txtbox1.ID = "TextBox"

txtbox1.Text = ""

txtbox1.Font.Size = 10

txtbox1.Font.Bold = False

AddHandler txtbox1.DataBinding, AddressOf txtbox1_DataBinding

container.Controls.Add(txtbox1)

End Sub

Private Sub txtbox1_DataBinding(ByVal sender As Object, ByVal e As EventArgs)

Dim target As TextBox = DirectCast(sender, TextBox)

Dim button As RadToolBarButton = DirectCast(target.BindingContainer, RadToolBarButton)

'Dim buttonText As String = DirectCast(DataBinder.Eval(button, "Text"), String)

'target.Text = buttonText

target.Text = ""

target.ToolTip = "What do you wish to search for?"

End Sub

End Class

Finally, here is the server-side code:

Public Class projects

Inherits System.Web.UI.Page

Private formToolBar As tToolBar

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

formToolBar = New tToolBar(RadToolBar1)

formToolBar.Enable()

If Not Page.IsPostBack Then

'formToolBar.Skin = "Windows7"

Else

End If

End Sub

Protected Sub RadToolBar1_ButtonClick(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadToolBarEventArgs) Handles RadToolBar1.ButtonClick

' the following just tests whether or not I can access the text from the search textbox.

formToolBar.Skin = formToolBar.SearchText

txtSearchFieldContents.Text = "Skin: " & formToolBar.Skin

' what I need is a way in the CLASS to dispatch (fire) events per button,

' so that I can have individual handlers in this VB.NET code.

' That way, I don't have to do fancy footwork in the VB.NET, but do all

' the dirty work in the CLASS, and just let the user

' here deal with the inner button.

End Sub

End Class

I am sure that in the CLASS, I handle the ToolBar OnClick event, and then determine WHICH RadButton was clicked, and raise an event, which has a CLASS HANDLER for that event. I would have that handler written in such a way as the user of the class can then create the handler that "HANDLES" tToolBarExample.OnClick event. This is my question: how do I do this inside my class? I seem to be close, but I am stuck trying to figure out the final bit.

Thank you

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Class Wrapper Event Handling

3 Answers, 1 is accepted