WPF Custom TextTrimming

Question

I need to do a special text trimming. Lets say that my string is: abcd

The default trimming would give me this: ab...

But I need it to be. a..d

Any idea how to implement it?

currnently I'm using

<TextBlock Text="abcdLongWord" TextTrimming="CharacterEllipsis"/>

What is the criteria for the text to be trimmed? You want only the first or last character? — CodeZombie, Apr 09 '13 at 11:20
ZombieHunter - I would like that the number of characters that are displayed would be configurable, but for simplifying we can start with only one character — Erez, Apr 09 '13 at 11:23
What is the purpose of the XML in your question? The string you want to trim is just a simple string, right? As in "_show only first and last letter if the string is longer than X_", am I correct? — Kjartan, Apr 09 '13 at 11:41
Arvo - it seems like you are the winner, plaese make an asnwer and I will accept it. — Erez, Apr 09 '13 at 12:31

score 1 · Answer 1 · answered Apr 09 '13 at 12:42

I have had this concern in the past and wrote my own converter to handle the process of Kearning.

Converter Class

internal class KearningConverter : IValueConverter {

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
        string result = value.ToString();

        try {
            int length = int.Parse(parameter.ToString());

            if (result.Length > length) {
                result = result.Substring(0, length) + "...";
            }
        } catch {
            result += "...";
        }
        return result;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
        throw new NotImplementedException();
    }
}

Xaml Markup

xmlns:conv="clr-namespace:project.converters;assembly=project"

<Window.Resources>
<conv:KearningConverter x:Key="kearnConverter"/>
</Window.Resources>

<TextBlock Text="{Binding Path=AttributeName, Converter={StaticResource kearnConverter}, ConverterParameter=3}"/>

This way you can have multiple implementations of the kearning based on different requirements depening on the layout of your UI.

And now the funny part is to calculate ConverterParameter value dynamically. And what if TextBlock size is changed? We should trim in this case too, isn\`t it? — icebat, Apr 09 '13 at 13:04

Łukasz Motyczka · Answer 2 · 2013-04-09T11:30:12.270

-3

Not tested this but depending on what you actually need:

string test = "abcdefghij";
  int nCharNum = test.Length();
  test.Remove(2, nCharNum - 1); // this will get you "aj"
  //or
  test.Remove(2, 3); // this will result in "adefg..."
  //or
  test.Remove(2, nCharNum - 1);
  test.Insert(2, "..") // this will get you "a..j"

Hope this helps. (Indexes may need some correction)

edited Apr 09 '13 at 11:30

answered Apr 09 '13 at 11:25

Łukasz Motyczka

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Thanks, but what you suggested is not textTrimming it is string manipulation, I need the text to trimm depends on the ui element width and not by hardcoded decision. – Erez Apr 09 '13 at 11:30
Do you want to replace inside characters when some textox is smaller then some value? Is that right? – Łukasz Motyczka Apr 09 '13 at 11:42
@Erez: Where is that specified in your original question? You can't expect a "correct" answer with an imprecise question, and an answer certainly should not be voted down if it does in fact answer the written question. – Kjartan Apr 09 '13 at 12:43
I think the question is very precise. – Matthias Sep 22 '16 at 22:47

WPF Custom TextTrimming

2 Answers2