Add conditional redrawing

This covers most of the previous functionality, but separating the input
handling and rendering functions. Only cursor drawing and a few corner
cases missing.

1 files changed, 13 insertions, 23 deletions

diff --git a/src/sequencer.c b/src/sequencer.c
index b689bf5..a560bcb 100644
--- a/src/sequencer.c
+++ b/src/sequencer.c
@@ -9,14 +9,14 @@
 
 void set_time(int bpm);
 
-bool redraw_pattern_buttons = false;
-bool redraw_play_pause = false;
-bool redraw_trigs = false;
-bool redraw_channels = false;
-bool redraw_bank_buttons = false;
-bool redraw_params = false;
-bool redraw_bpm = false;
-bool redraw_piano_note = false;
+bool redraw_pattern_buttons = true;
+bool redraw_play_pause = true;
+bool redraw_trigs = true;
+bool redraw_channels = true;
+bool redraw_bank_buttons = true;
+bool redraw_params = true;
+bool redraw_bpm = true;
+bool redraw_piano_note = true;
 
 void
 irq_timer(void) {
@@ -198,39 +198,30 @@ handle_channel_selection(void) {
                 patterns[pattern_selection_loc].ch4.active ^= 1;
             } break;
         }
-        draw_channels();
+        redraw_channels = true;
     }
     if (key_tap(KEY_RIGHT)) {
         trig_selection_loc = 0;
         param_selection_loc = 0;
         input_handler = handle_trigger_selection;
-        draw_channel_cursor(channel_selection_loc, COL_GREY);
-        draw_trig_cursor(trig_selection_loc, COL_CURSOR);
-        TriggerNote *trig = get_current_trig();
-        draw_note(trig->note, COL_NOTE_PRESSED);
-        draw_parameters();
+        redraw_piano_note = true;
+        redraw_params = true;
     } else if (key_tap(KEY_LEFT)) {
         input_handler = handle_pattern_selection;
-        draw_channel_cursor(channel_selection_loc, COL_GREY);
-        draw_pattern_cursor(pattern_selection_loc, COL_CURSOR);
     } else if (key_tap(KEY_UP)) {
-        draw_channel_cursor(channel_selection_loc, COL_BG);
         if (channel_selection_loc == 0) {
             channel_selection_loc = SEQ_N_CHANNELS - 1;
         } else {
             channel_selection_loc = MAX(channel_selection_loc - 1, 0);
         }
-        draw_channel_cursor(channel_selection_loc, COL_CURSOR);
-        draw_triggers();
+        redraw_trigs = true;
     } else if (key_tap(KEY_DOWN)) {
-        draw_channel_cursor(channel_selection_loc, COL_BG);
         if (channel_selection_loc == SEQ_N_CHANNELS - 1) {
             channel_selection_loc = 0;
         } else {
             channel_selection_loc = MIN(channel_selection_loc + 1, SEQ_N_CHANNELS);
         }
-        draw_channel_cursor(channel_selection_loc, COL_CURSOR);
-        draw_triggers();
+        redraw_trigs = true;
     }
 }
 
@@ -384,7 +375,6 @@ handle_pattern_selection(void) {
         }
     } else if (key_tap(KEY_DOWN)) {
         if (pattern_selection_loc < 7) {
-            draw_pattern_cursor(pattern_selection_loc, COL_BG);
             pattern_selection_loc = pattern_selection_loc + 1;
             redraw_channels = true;
             redraw_trigs = true;