Expose FontManager internal properties/methods about questpdf

[MarcinZiabek]

Hello 😁 What requirement exactly are you trying to accomplish? Is there any text-style feature missing?

Generally speaking, I am against exposing the SkiaSharp dependency. It is coupled within the internal, non-public process that may change on a per release basis. I am looking forward to providing alternative solutions. A better understanding of your problem with help.

[hungnd1475]

Hi. There were two things I was trying to achieve:

1. An outline effect to some letters.
2. Drawing a symbol in line with the text.

For the first requirement, I needed something similar to SKPaintStyle.Stroke, but it is not possible with the high level TextStyle, so I had to use the lower level SKPaint instead. In addition, I also loaded some custom fonts with FontManager.RegisterFont() to use for the whole file (including the outlined letters), but because I don't have access to the FontManager's internal SKTypeface dictionary, I had to duplicate them as well.

Regarding the second requirement, I'm not sure if there is an alternative way without using SKPaint to draw the text. I tried using Inlined but seems like it doesn't play well with Canvas, so I ended up using Canvas to draw everything (including the text).

I guess we can add a new API to TextStyle to achieve the first requirement, but not sure if it's possible with the second one. So I thought exposing FontManager's internals can at least make creating SKPaint with custom typefaces a little less painful.

[MarcinZiabek]

An outline effect to some letters.

I think that the stroke effect has a very minor usage. Therefore it is not available out of the box. Using the Canvas element to generate custom content is a proper approach. If more people require this functionality, I can rethink 😀

Drawing a symbol in line with the text.

This is already supported. Please take a look here. Please note that injected elements do not support line-breaking and need to be visible as a whole block. You can inject everything you want.