Text measurement improvements

[kekekeks]

We need something to be able to implement methods like public override void MeasureString(string str, Font font, double maxWidth, out int charFit, out double charFitWidth) (HtmlRenderer requires this).

For example, Graphics.MeasureCharacterRanges returns info about each character's position.

[grokys]

Is there an equivalent API in WPF that we can copy?

[tshcherban]

There is no equivalent, but WPF contains FormattedText class. Usage example: http://stackoverflow.com/a/840642

[kekekeks]

@tshcherban https://github.com/Perspex/Perspex/blob/master/src/Perspex.SceneGraph/Media/FormattedText.cs

[h0730303779]

How did you solve it later? I am now rendering some strings and also need to know the width of each rendered string.

[kekekeks]

See TextFormatter and friends.

In HtmlRenderer MeasureString is now implemented like this: https://github.com/AvaloniaUI/Avalonia.HtmlRenderer/blob/f4e8c20a53a4cb4cc09b4f2ad8460e75d9f1fb36/Avalonia.HtmlRenderer/Adapters/GraphicsAdapter.cs#L115-L124