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text,widget/material: Update doc for Shaper & Theme

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Note that you should use different Themes, with different Shapers, for
different top-level windows, and explain why.

Signed-off-by: Larry Clapp <larry@theclapp.org>
This commit is contained in:
Larry Clapp
2024-08-13 11:22:58 -04:00
committed by Elias Naur
parent 6efcb65c4b
commit 95f63c66b6
2 changed files with 12 additions and 1 deletions
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text/shaper.go
+9 -1
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@@ -199,7 +199,15 @@ func (f Flags) String() string {
type GlyphID uint64
// Shaper converts strings of text into glyphs that can be displayed.
// Shaper converts strings of text into glyphs that can be displayed. The same
// Shaper should not be used in different goroutines.
//
// The Shaper controls text layout and has a cache, implemented as a map, and
// so laying out text in two different goroutines can easily result in
// concurrent access to said map, resulting in a panic.
//
// Practically speaking, this means you should use different Shapers for
// different top-level windows.
type Shaper struct {
config struct {
disableSystemFonts bool