Are there plan to import standard line-breaking algorithm?

Feature request
1

The current text line-breaking has many issues in multilingual contexts, such as punctuation marks appearing at the beginning of a line. Does LVGL have plans to address this?

1 Like
2

Hi,

Please send a code snippet to reproduce the issue.

3

Please ignore the characters in the image that are not in the font library.

lv_obj_t * cz_label = lv_label_create(lv_scr_act());
    lv_label_set_text(cz_label,
                      "Antidisestablishmentarianism ANCS（Apple Notification Center Service）通知确实包含应用程序名称。当iOS设备将通知推送到配对的蓝牙设备（如智能手表）时，ANCS会传递一些关键信息，其中包括应用程序的名称（App Identifier），标题（Title），消息内容（Message），以及其他与通知相关的详细信息。这样，配对的设备就能根据这些信息来显示适当的通知内容。");
    lv_obj_set_style_text_font(cz_label, &lv_font_simsun_16_cjk, 0);
    lv_obj_set_width(cz_label, 160);
    lv_obj_align(cz_label, LV_ALIGN_TOP_LEFT, 5, 5);

1724659452755

Here are two issues:

  1. Long words are wrapped directly. Ideally, a hyphen should be added after the correct syllable, which is common in German. (However, this might require introducing libhyphen, which could be too resource-intensive.)
  2. Line breaks are occurring in inappropriate positions. For example, in this image, a Chinese punctuation mark appears at the beginning of a line. This might require an algorithm similar to UAX #14: Unicode Line Breaking Algorithm.
1 Like
4

Hyphening is really too resource hungry for us. However, I’ll keep it in mind when we rework the typesetting interface.

This standard is new to me. I’ll check it out.