About Text area (lv_ta) style

[BenQoo]

I have some question about lv_ta on website's document

1. text style

   http://www.gl.littlev.hu/object-types/text-area-lv_ta

   Style usage

   • ...
   • Text style is inherited from the parent page.

   Dose the "parent page" mean lv_ta's parent must be a lv_page object?
   But it seems that the text style can be accessed from label member in lv_ta.

2. cursor style

   Style usage

   • ...
   • Cursor width and color comes from the parent's ccolor and line_width style properties.

   I try to create a lv_con as the parent of lv_ta, then change its ccolor and line_width, but it doesn't apply to cursor.

Thank you!

[kisvegabor]

Hi,
maybe I wasn't clear in the documentation. The Text area is a Page too and the Label inherits its style.
For example:

static lv_style_t style;
lv_style_get(LV_STYLE_PRETTY, &style);
style.ccolor = COLOR_RED;          //Red text
style.mcolor = COLOR_GREEN;        //Green color on the top of Text area

lv_obj_t * ta_1 = lv_ta_create(lv_scr_act(), NULL);
lv_obj_set_style(ta_1, &style);

[BenQoo]

Hi,
Thanks for your reply.
I tested the following example, but style.ccolor not work on cursor and text.
The color of cursor and text is still in black.

    static lv_style_t style;
    lv_style_get(LV_STYLE_PRETTY, &style);
    style.ccolor = COLOR_RED;          //Red text & red cursor?
    style.mcolor = COLOR_GREEN;        //Green color on the top of Text area
    style.line_width = 5 * LV_DOWNSCALE;

    lv_obj_t * ta_1 = lv_ta_create(lv_scr_act(), NULL);
    lv_obj_set_style(ta_1, &style);
    lv_obj_refr_style(ta_1);

[BenQoo]

I have tried and found some ways to change the text color.

• To set a additional style object to label
• To change ccolor on the parent object of `lv_ta.

For example:

    static lv_style_t style;
    lv_style_get(LV_STYLE_PRETTY, &style);
    style.ccolor = COLOR_RED;          // Red text
    style.mcolor = COLOR_GREEN;        // Green color on the top of Text area
    style.line_width = 5 * LV_DOWNSCALE;

    lv_obj_t * ta_1 = lv_ta_create(lv_scr_act(), NULL);
    lv_obj_set_style(ta_1, &style);

    /* create style for label */
    static lv_style_t txt_style;
    lv_style_get(LV_STYLE_PRETTY, &txt_style);
    txt_style.ccolor = COLOR_YELLOW;

    lv_obj_t * label = lv_ta_get_label(ta_1);
    lv_obj_set_style(label, &txt_style);

I'm not sure whether the two usages are correct or not.
Because it will become failed if I append the following function calls at the end of code.

lv_obj_refr_style(ta_1);

or

lv_page_set_sb_mode(ta_1, LV_PAGE_SB_MODE_OFF);

[kisvegabor]

Sorry, I forget to say, already there is bugfix related to this. Please, check out lvgl and misc beta.
Your work around is okay too, but "one style" setting will work too in beta.

I'm not sure whether the two usages are correct or not.
Because it will become failed if I append the following function calls at the end of code.
lv_obj_refr_style(ta_1);
or
lv_page_set_sb_mode(ta_1, LV_PAGE_SB_MODE_OFF);

What do you experience? lv_obj_refr_style(ta_1); is not required because lv_obj_set_style() do it as well.

[BenQoo]

What do you experience? lv_obj_refr_style(ta_1); is not required because lv_obj_set_style() do it as well.

I misunderstood that lv_obj_set_style() have to notify object the style is changed, so I added lv_obj_refr_style() after it. Thanks for your explanation, I get it!

After testing on beta branch, text portion is working fine now, the cursor width and color are not changed by ccolor and line_width.

[kisvegabor]

Great! :)

lv_obj_refr_style() is required when your program is running and randomly you modify a style. The object need to be notified. However when you set a new style with lv_obj_set_style() then the object will be refreshed to the new style automatically.

Thank you for reporting the issue. As it is working now I close it!

[BenQoo]

sorry for my unclear.
On the cursor portion, I still can't control its width and color from lv_ta's ccolor and line_width.

[kisvegabor]

Sorry, I misread it.
It was strange a behavior. I pushed a fix into beta. Now it also uses the Text area style like the text do.

[kisvegabor]

Fixed in v5.0.0