ASM
Top achievements
Rank 1
Iron
Iron
Rank 1
Iron
Iron
Hello,
I'm struggling to get some events to work on a RadListViewElement, which is a child of a custom RadElement, which in turn is inside another custom RadControl. I guess a few lines of code will help to describe this:
Imports Telerik.WinControls
Imports Telerik.WinControls.UI
Public Class xElement
Inherits RadElement
Private listElement As RadListViewElement
Public Sub New()
'Me.NotifyParentOnMouseInput = True
'Me.ShouldHandleMouseInput = True
'Me.Capture = True
'Me.CaptureOnMouseDown = True
End Sub
Protected Overrides Sub OnLoaded()
MyBase.OnLoaded()
AddHandler listElement.ItemMouseUp, Sub(s, e)
If e.OriginalEventArgs.Button = MouseButtons.Left Then
listElement.SelectedItem = e.Item
End If
End Sub
End Sub
Protected Overrides Sub CreateChildElements()
MyBase.CreateChildElements()
listElement = New RadListViewElement
With listElement
'.ShouldHandleMouseInput = True
'.NotifyParentOnMouseInput = True
'.Capture = True
'.CaptureOnMouseDown = True
.ViewType = ListViewType.ListView
.DataSource = New List(Of String)(New String() {"a", "b", "c"})
End With
Me.Children.Add(listElement)
End Sub
End ClassImports Telerik.WinControls
<ToolboxItem(True)>
Public Class xControl
Inherits RadControl
Private element As xElement
Public Sub New()
element = New xElement()
RootElement.Children.Add(element)
End Sub
End ClassSome remarks on this piece of code:
- The items in listview react to events like mouseEnter/Leave.
- These items can't be selected by using the mouse, the click event does nothing on them, the action needs to be managed manually, which here is done in the OnLoaded() sub.
- The click event works on other elements inside listView, so, for instance, the scrollbar of the item container can be clicked, the list of items can be scrolled.
So, some events work out-of-the-box and some do not, and a certain event works here but not there, so I'm somewhat confused on what's going on. Anyway, it doesn't seem like the way it's supposed to be, and I'm sure the proper solution is a lot less cumbersome than manually capturing each event and then replicating the original behavior.
I guess I'm just missing something about how TPF works, maybe there's some element not initialized correctly, perhaps I need to enable some property. Any suggestions on this?
Thank you
1 Answer, 1 is accepted
0
Hello, Armand,
The provided code snippet is greatly appreciated. I used it in my sample project to test the behavior on my end. I confirm that that when using the custom implementation, the items in RadListViewElement don't get selected after clicking.
Usually, the RadListView control handles the MouseUp message and invokes the RadListViewElement.ProcessMouseUp method which internally processes the selection. Since there is no RadListView control in this implementation, the RadListViewElement.ProcessMouseUp method is not triggered.
The possible solution that I can suggest is to use a RadHostItem and host the entire RadListView control:
The attached gif file illustrates the achieved result.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
The provided code snippet is greatly appreciated. I used it in my sample project to test the behavior on my end. I confirm that that when using the custom implementation, the items in RadListViewElement don't get selected after clicking.
Usually, the RadListView control handles the MouseUp message and invokes the RadListViewElement.ProcessMouseUp method which internally processes the selection. Since there is no RadListView control in this implementation, the RadListViewElement.ProcessMouseUp method is not triggered.
The possible solution that I can suggest is to use a RadHostItem and host the entire RadListView control:
<ToolboxItem(True)>
Public Class xControl
Inherits RadControl
Private element As xElement
Public Sub New()
element = New xElement()
RootElement.Children.Add(element)
End Sub
End Class
Public Class xElement
Inherits RadElement
Private listView As RadListView
Public Sub New()
End Sub
Protected Overrides Sub CreateChildElements()
MyBase.CreateChildElements()
listView = New RadListView
Dim host As New RadHostItem(listView)
With listView
.ViewType = ListViewType.ListView
.DataSource = New List(Of String)(New String() {"a", "b", "c"})
End With
Me.Children.Add(host)
End Sub
End ClassI hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik
Тhe web is about to get a bit better!
The Progress Hack-For-Good Challenge has started. Learn how to enter and make the web a worthier place: https://progress-worthyweb.devpost.com.