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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
Download Patch File Download Diff File Expand all files Collapse all files
examples/companion_radio/ui-lvgl/ChannelScreen.h
+5 -5
View File
@@ -262,10 +262,10 @@ void UITask::channelEditHex(bool hex) {
void UITask::channelEditField(lv_obj_t* ta) {
using namespace chanview;
if (!s_kb) return;
lv_obj_remove_state(s_name, LV_STATE_FOCUSED);
lv_obj_remove_state(s_secret, LV_STATE_FOCUSED);
lv_obj_add_state(ta, LV_STATE_FOCUSED); // draws the cursor
fieldFocus(s_name, false);
fieldFocus(s_secret, false);
lv_keyboard_set_textarea(s_kb, ta);
fieldFocus(ta, true);
if (lv_obj_has_flag(s_kb, LV_OBJ_FLAG_HIDDEN)) {
lv_obj_remove_flag(s_kb, LV_OBJ_FLAG_HIDDEN);
if (_body) lv_obj_set_height(_body, lv_obj_get_height(_body) - lv_obj_get_height(s_kb));
@@ -278,8 +278,8 @@ void UITask::channelEditKbHide() {
using namespace chanview;
if (!s_kb || lv_obj_has_flag(s_kb, LV_OBJ_FLAG_HIDDEN)) return;
lv_obj_add_flag(s_kb, LV_OBJ_FLAG_HIDDEN);
lv_obj_remove_state(s_name, LV_STATE_FOCUSED);
lv_obj_remove_state(s_secret, LV_STATE_FOCUSED);
fieldFocus(s_name, false);
fieldFocus(s_secret, false);
if (_body) lv_obj_set_height(_body, lv_obj_get_height(_body) + lv_obj_get_height(s_kb));
}