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how to Change border color active subitem in listviewdataitem?
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Khanh
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Khanh asked on 21 Sep 2019, 03:17 AM

Hi, I have two questions that need help regarding effects on listview
Question one: I tried changing the border color of active subitem using events: cellformating, VisualItemFormatting but I still haven't found a way to enable it.
Question two: How can I stop highlight current listviewitem? I want after running listview code, there will be no more highlighted items.
I have uploaded photos for you to visualize.
Thank you.

 

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Dimitar
Telerik team
answered on 23 Sep 2019, 10:25 AM

Hello Khanh,

1. You can use the CellFormatting event for this. Here is how to style the current cell: 

private void RadListView1_CellFormatting(object sender, ListViewCellFormattingEventArgs e)
{
    var cell = e.CellElement as DetailListViewDataCellElement;

    if (cell != null && cell.Row.Current && cell.Data.Current)
    {
        e.CellElement.BorderColor = Color.Red;                 
    }
    else
    {
        e.CellElement.ResetValue(LightVisualElement.BorderColorProperty, ValueResetFlags.Local);
    }
}

Since the entire row is styled at once you can use the VisualItemFormatting to set the BackColor:

private void RadListView1_VisualItemFormatting(object sender, ListViewVisualItemEventArgs e)
{
    e.VisualItem.DrawFill = false;
}

I hope this helps. Should you have any other questions, do not hesitate to ask.

Regards,
Dimitar
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Khanh
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answered on 24 Sep 2019, 04:43 PM
Hi, Dimitar.i get this error when run this line:
var cell = e.CellElement as DetailListViewDataCellElement;

System.InvalidCastException: 'Unable to cast object of type' Telerik.WinControls.UI.DetailListViewHeaderCellElement 'to type' Telerik.WinControls.UI.DetailListViewDataCellElement '.'

and in the second question, I want to be that after selecting the item (highlighted in blue) and I run the code, the item will return to the unselected state. so I thought I couldn't use VisualItemFormatting because I couldn't get an instance of ListViewVisualItemEventArgs.
Here my listview uses breeze theme
Can you check it again for me?
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Khanh
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answered on 24 Sep 2019, 05:28 PM

Hi, after checking again i made a mistake, i corrected my code and now your code worked for the first question.
with the second question: I have 1 button and button_click event
I want after clicking the button, the itemselected in listview is no longer highlighted so in the button_click code event I want to add a line at the last of procedule like:
sub button_click (...)
'my code
'.....
e.VisualItem.DrawFill = false '<<<<----- 
end sub
I want the effects to return to the same form when the form started

Thanks.

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Dimitar
Telerik team
answered on 25 Sep 2019, 08:35 AM

Hello Khanh,

You cannot access the visual elements outside of the event handler. You can clear the selection which should have the desired effect: 

private void radButton1_Click(object sender, EventArgs e)
{
    
    radListView1.CurrentItem = null;
    radListView1.CurrentColumn = null;
    radListView1.SelectedItem = null;
}

I hope this helps. Should you have any other questions, do not hesitate to ask.

Regards,
Dimitar
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Khanh
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answered on 26 Sep 2019, 06:56 PM

Hi Dimitar.
I tested it, worked perfectly: D, so I was able to finish my first vsto project with telerik. I am very happy with it.
Thank you as well as the other admin very much.

Have a nice weekend :)

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Dimitar
Telerik team
answered on 27 Sep 2019, 06:51 AM

Hello Khanh,

I am glad to hear that this works as expected and you have achieved your goals. 

Do not hesitate to contact us if you have other questions.

Regards,
Dimitar
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Khanh
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Dimitar
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Khanh
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