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Text attributes
Last updated at 5:07 am UTC on 30 March 2017
Text attributes like bold and italics are stored in several different ways in Squeak.

This is a source of some bugs and inconsistent behavior of some tools.

Class Text have two instance variables: text and runs. One collection of the characters and one collection of text attributes in a RunArray.

Examle of a RunArray:

a RunArray runs: #(14 16 1 321 2 85) values: {#() . 
{a TextFontChange font: 1} . {a TextColor code: Color black} . 
{a TextColor code: (Color r: 0.0 g: 0.5 b: 0.5)} . 
{a TextColor code: Color black} . 
{a TextColor code: (Color r: 0.0 g: 0.5 b: 0.5)}}

"#(14 16 1 321 2 85)" are the total number of characters in the text divided up in parts which will get different emphasis or font etc.

For the first 14 characters use {a TextFontChange font: 1}.
For the next 16 characters use {a TextColor code: Color black} .

Text is displayed with a TextStyle

TextStyle does not seem to keep track of different fonts. It stores fonts in a fontArray but that seems to not be all the fonts used in the text. Rather it seems that a default font is stored in the fontArray and some tools or menus can change what is stored in the fontArray, but it's not totally clear what and why.

A RunArray {a TextFontChange font: 1} will use fontArray index 1 font.

Much of the inconsitency in the tools seem to be because TextStyle is not updated to reflect which fonts are used in a text.

Some emphasis is stored in the fonts so a font can have a derivativeFont with another style.