Composing: changing track size and position

1 files changed, 19 insertions, 2 deletions

diff --git a/source/saw/main.c b/source/saw/main.c
index 0720960..fdcda68 100644
--- a/source/saw/main.c
+++ b/source/saw/main.c
@@ -290,8 +290,25 @@ static void saw_ui_compose(i64 x0, i64 y0, i64 width, i64 height) {
         saw_compose.rolls[i] = -1;
         roll->enabled        = 0;
       } else {
-        if (saw_lbutton_click)
-          saw_current_roll = saw_compose.rolls[i];
+        if (saw_lbutton_click) {
+          if (saw_current_roll == saw_compose.rolls[i]) {
+            i64 cell = ((saw_mouse_x - saw_compose.offset_x) *
+                        grid_rate) /
+                       grid_scale;
+            i64 c0 = (roll->frame * grid_rate) / SAW_SAMPLE_RATE;
+            i64 c1 = c0 + (roll->size * grid_rate) / roll->rate;
+            saw_compose.grid_input = 1;
+            saw_compose.grid_roll  = saw_current_roll;
+            if (cell - c0 > c1 - cell) {
+              saw_compose.grid_cell = c0;
+              roll->size = ((cell - c0 + 1) * roll->rate) / grid_rate;
+            } else {
+              saw_compose.grid_cell = c1 - 1;
+              roll->size = ((c1 - cell + 1) * roll->rate) / grid_rate;
+            }
+          } else
+            saw_current_roll = saw_compose.rolls[i];
+        }
         hover_any = 1;
       }
     }