[MatPaginator] Extracting the OF preposition out of getRangeLabel for easier I18n

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

To be able to provide a class that only replaces the string values and not the whole getRangeLabel function. The code:

...
 /** A label for the preposition. */
  prepositionLabel: string = 'of';

  /** A label for the range of items within the current page and the length of the whole list. */
  getRangeLabel = (page: number, pageSize: number, length: number) => {
    if (length == 0 || pageSize == 0) { return `0 ${this.prepositionLabel} ${length}`; }

    length = Math.max(length, 0);

    const startIndex = page * pageSize;

    // If the start index exceeds the list length, do not try and fix the end index to the end.
    const endIndex = startIndex < length ?
        Math.min(startIndex + pageSize, length) :
        startIndex + pageSize;

    return `${startIndex + 1} - ${endIndex} ${this.prepositionLabel} ${length}`;
  }
...

What is the current behavior?

I don’t know how often people replace the way the range label is generated, but I am guessing most just copy/paste the code and only translate the preposition to their language.

What is the use-case or motivation for changing an existing behavior?

If there are changes in the logic behind getRangeLabel, they won’t be reflected if you are providing translations. Most languages work the same way (the preposition is between the endIndex and length) so extracting the preposition would be much more convenient.

[dushkostanoeski]

That is why I’m not saying to completely hide the getRangeLabel property.

If you’re working with a language where only the preposition needs to be translated, you provide only the preposition property, but if the whole label needs to be changed, you can skip the preposition and provide the label because the preposition is only used in the label.

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