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perf(l2): no redraws while nothing changes

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Found by counting flushes on idle screens in the sim:
- The compose field's cursor blinked (a redraw every 400 ms) as soon as
  a conversation opened, the keyboard hidden: lv_keyboard_set_textarea()
  focuses the field, and LVGL only stops a blink when the cursor moves.
  fieldFocus() sets the state and nudges the blink; also used for the
  WiFi and channel fields, which left theirs running.
- lv_obj_align_to() restyles on every call, so the status bar's icons
  redrew every second; placeLeftOf() moves them only when they move.
- Text colours set every second (nav bar, GPS status, Diag errors) go
  through setTextColor(), which skips an unchanged colour.
- A LV_LABEL_LONG_DOT label writes its "..." into its own text, so
  setText() never matched and rewrote it every refresh (the nav bar's
  hint); labelShows() reads past the dots.
- The map area, the area-outline, trail and vector-label layers were
  invalidated on every map refresh (every 3 s, a full-map redraw); now
  only when the view or what they draw changed.

Idle map: 17 -> 1 flush in 5 s; list and settings screens: 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-09-30 23:22:31 +02:00
co-authored by Claude Opus 5.5
parent 74efb6addd
commit 1ff58d4a81
10 changed files with 102 additions and 43 deletions
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examples/companion_radio/ui-lvgl/GpsScreen.h
+5 -5
View File
@@ -325,13 +325,13 @@ void UITask::refreshGps() {
bool fix = false;
if (!g) {
setText(s_status, "Not available");
lv_obj_set_style_text_color(s_status, lv_color_hex(theme::TEXT_MUTED), 0);
setTextColor(s_status, theme::TEXT_MUTED);
} else if (off) {
setText(s_status, "GPS is off");
lv_obj_set_style_text_color(s_status, lv_color_hex(theme::TEXT_MUTED), 0);
setTextColor(s_status, theme::TEXT_MUTED);
} else if (!data) {
setText(s_status, "No data");
lv_obj_set_style_text_color(s_status, lv_color_hex(theme::FAIL), 0);
setTextColor(s_status, theme::FAIL);
#if defined(SEEED_WIO_TRACKER_L2)
snprintf(used, sizeof(used), "Nothing from the receiver (%lu B)", (unsigned long)gps.rxChars());
#else
@@ -343,10 +343,10 @@ void UITask::refreshGps() {
fix = g->hasFix();
if (fix) {
setText(s_status, g->fix_mode == 2 ? "2D fix" : "3D fix");
lv_obj_set_style_text_color(s_status, lv_color_hex(theme::OK), 0);
setTextColor(s_status, theme::OK);
} else {
setText(s_status, "Searching");
lv_obj_set_style_text_color(s_status, lv_color_hex(theme::ACCENT), 0);
setTextColor(s_status, theme::ACCENT);
}
snprintf(used, sizeof(used), "%d of %d used", fix ? (used_n ? used_n : g->sats_used) : 0, s_n);
snprintf(inview, sizeof(inview), "%d heard", tracked);