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How to handle the width of customized items?
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红耀
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红耀 asked on 24 Aug 2018, 09:11 AM

I want to develop a WinForms application which is similar with Outlook. For the email list part, I use the custom item in the ListView to display the email information(From, Subject, Receive Time, Body Content). The ListView control is inside a split container(Dock Fill). So that, user can change the width of ListView. 

The problem is, when the subject or body content is very long, I don't want the item to auto size. I want the item hidden the text when overflow. When user changes the width of ListView via split container, the text can be shown more or less according to the width of ListView. It likes in the outlook, you can change the width of the email list, the body content and the subject can be automatically displayed to fit the width. How to implement this function by using ListView?

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红耀
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answered on 24 Aug 2018, 09:14 AM
01.private class MailListVisualItem : SimpleListViewVisualItem
02.        {
03.            private LightVisualElement element1;
04.            private LightVisualElement element2;
05.            private StackLayoutPanel layout;
06. 
07.            protected override void CreateChildElements()
08.            {
09.                base.CreateChildElements();
10. 
11.                this.layout = new StackLayoutPanel();
12.                this.layout.EqualChildrenWidth = false;
13.                this.layout.Margin = new Padding(20, 0, 0, 0);
14. 
15.                this.element1 = new LightVisualElement();
16.                element1.TextAlignment = ContentAlignment.TopLeft;
17.                element1.Size = new Size(260, 0);
18.                element1.MinSize = new Size(260, 0);
19.                element1.NotifyParentOnMouseInput = true;
20.                element1.ShouldHandleMouseInput = false;
21.                this.layout.Children.Add(this.element1);
22. 
23.                this.element2 = new LightVisualElement();
24.                element2.TextAlignment = ContentAlignment.TopLeft;
25.                element2.Size = new Size(80, 0);
26.                element2.NotifyParentOnMouseInput = true;
27.                element2.ShouldHandleMouseInput = false;
28.                this.layout.Children.Add(this.element2);
29. 
30.                this.Children.Add(this.layout);
31.            }
32. 
33.            protected override void SynchronizeProperties()
34.            {
35.                base.SynchronizeProperties();
36. 
37.                if (this.Data.GetType() != typeof(ListViewDataItemGroup))
38.                {
39.                    this.Text = "";
40.                    var bodyText = this.Data["BodyText"] == null ? "" : this.Data["BodyText"].ToString().Replace(System.Environment.NewLine, " ");
41. 
42.                    this.element1.Text = "<html><span>" +
43.                        "<span style=\"font-size:12\">" + this.Data["From"] + "</span>" +
44.                        "<br><span style=\"color:#13224D;font-family:Segoe UI;font-size:10\">" + this.Data["Subject"] + "</span>" +
45.                        "<br><span style=\"color:#13224D;font-family:Segoe UI;font-size:10\">" + bodyText + "</span></span></html>";
46. 
47.                    this.element2.Text = "<html><span> </span>" +
48.                        "<br><span style =\"color:#13224D;font-family:Segoe UI;font-size:10\">" + this.Data["ReceivedTime"] + "</span></html>";
49. 
50.                    this.TextAlignment = ContentAlignment.TopLeft;
51.                }
52.            }
53. 
54.            protected override Type ThemeEffectiveType
55.            {
56.                get
57.                {
58.                    return typeof(SimpleListViewVisualItem);
59.                }
60.            }
61.        }

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Dimitar
Telerik team
answered on 24 Aug 2018, 11:45 AM
Hello,

This would not work when using StackLayouPanel. In this case, you need to manually measure and arrange the items. You need to set the ClipDrawing and ClipText properties as well. Here is the code:
public class MailListVisualItem : SimpleListViewVisualItem
{
    private LightVisualElement element1;
    private LightVisualElement element2;
   
 
    protected override void CreateChildElements()
    {
        base.CreateChildElements();
 
        this.element1 = new LightVisualElement();
        element1.ClipText = true;
        element1.TextAlignment = ContentAlignment.TopLeft;
        element1.ClipDrawing = true;
        element1.NotifyParentOnMouseInput = true;
        element1.ShouldHandleMouseInput = false;
        this.Children.Add(this.element1);
 
        this.element2 = new LightVisualElement();
        element2.TextAlignment = ContentAlignment.TopLeft;
   
        element2.NotifyParentOnMouseInput = true;
        element2.ShouldHandleMouseInput = false;
        this.Children.Add(this.element2);
    }
 
    protected override void SynchronizeProperties()
    {
        base.SynchronizeProperties();
 
        if (this.Data.GetType() != typeof(ListViewDataItemGroup))
        {
            this.Text = "";
            var bodyText = this.Data["BodyText"] == null ? "" : this.Data["BodyText"].ToString().Replace(System.Environment.NewLine, " ");
 
            this.element1.Text = "<html><span>" +
                "<span style=\"font-size:12\">" + this.Data["From"] + "</span>" +
                "<br><span style=\"color:#13224D;font-family:Segoe UI;font-size:10\">" + this.Data["Subject"] + "</span>" +
                "<br><span style=\"color:#13224D;font-family:Segoe UI;font-size:10\">" + bodyText + "</span></span></html>";
 
            this.element2.Text = "<html><span> </span>" +
                "<br><span style =\"color:#13224D;font-family:Segoe UI;font-size:10\">" + this.Data["ReceivedTime"] + "</span></html>";
 
            this.TextAlignment = ContentAlignment.TopLeft;
        }
    }
 
    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(SimpleListViewVisualItem);
        }
    }
    protected override SizeF MeasureCore(SizeF availableSize)
    {
        var result = base.MeasureCore(availableSize);
        var dateSize = element2.DesiredSize;
        element1.Measure(new SizeF(result.Width - dateSize.Width, result.Height));
 
        return result;
    }
    protected override SizeF ArrangeOverride(SizeF finalSize)
    {
        var result = base.ArrangeOverride(finalSize);
        var dateSize = element2.DesiredSize;
        element1.Arrange(new RectangleF(0, 0, result.Width - dateSize.Width, result.Height));
        element2.Arrange(new RectangleF(result.Width - dateSize.Width, 0, dateSize.Width, result.Height));
 
        return result;
    }
}

I hope this will be useful. Let me know if you have additional questions.

Regards,
Dimitar
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红耀
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answered on 25 Aug 2018, 03:40 PM

It works perfect as I want. Thank you so much.

By the way, If I want the text end with (...) when overflow, how can I set? 

I tried to set the property AutoEllipsis to true for the LightVisualElement, but it seems not working.

I also want to draw border for each custom item in the ListView, how can I do? 

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红耀
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answered on 27 Aug 2018, 02:34 AM
this.element1 = new LightVisualElement();
element1.DrawBorder = true;
element1.BorderTopWidth = 0;
element1.BorderLeftWidth = 0;
element1.BorderRightWidth = 0;
element1.BorderBottomWidth = 1;
element1.BorderBottomColor = Color.FromArgb(239, 239, 239);

 

I just want to draw bottom border for the item, I set border properties like this. But it still has all borders.


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红耀
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answered on 28 Aug 2018, 01:57 AM
this.element1 = new LightVisualElement();
element1.DrawBorder = true;
element1.BorderTopWidth = 0;
element1.BorderLeftWidth = 0;
element1.BorderRightWidth = 0;
element1.BorderBottomWidth = 1;
element1.BorderBottomColor = Color.FromArgb(239, 239, 239);

 

I just want to draw bottom border for the item, I set border properties like this. But it still has all borders.


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Dimitar
Telerik team
answered on 28 Aug 2018, 08:30 AM
Hello,

The AutoEllipsis would not work when HTML-like formatting is used. if you need this to work consider adding a separate LightVisualElement for the description. 

To show only the bottom border you need to set the BorderBoxStyle property as well:
element1.BorderBoxStyle = Telerik.WinControls.BorderBoxStyle.FourBorders;

Let me know if I can assist you further.
 
Regards,
Dimitar
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红耀
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answered on 28 Aug 2018, 10:10 AM
Many thanks.
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红耀
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Dimitar
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