Add keymap with scrolling mode for the Ploopy Nano trackball (#13013)

Co-authored-by: Drashna Jaelre <drashna@live.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/keyboards/ploopyco/trackball_nano/keymaps/maddie/keymap.c b/keyboards/ploopyco/trackball_nano/keymaps/maddie/keymap.c
new file mode 100644
index 000000000..6f568ecf5
--- /dev/null
+++ b/keyboards/ploopyco/trackball_nano/keymaps/maddie/keymap.c
@@ -0,0 +1,79 @@
+/* Copyright 2021 Colin Lam (Ploopy Corporation)
+ * Copyright 2020 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+ * Copyright 2019 Sunjun Kim
+ * Copyright 2019 Hiroyuki Okada
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+// safe range starts at `PLOOPY_SAFE_RANGE` instead.
+uint8_t scroll_enabled = 0;
+uint8_t lock_state = 0;
+int16_t delta_x = 0;
+int16_t delta_y = 0;
+
+void process_mouse_user(report_mouse_t *mouse_report, int16_t x, int16_t y) {
+        if (scroll_enabled) {
+                delta_x += x;
+                delta_y += y;
+                
+                if (delta_x > 60) {
+                        mouse_report->h = 1;
+                        delta_x = 0;
+                } else if (delta_x < -60) {
+                        mouse_report->h = -1;
+                        delta_x = 0;
+                }
+
+                if (delta_y > 15) {
+                        mouse_report->v = -1;
+                        delta_y = 0;
+                } else if (delta_y < -15) {
+                        mouse_report->v = 1;
+                        delta_y = 0;
+                }
+        } else {
+                mouse_report->x = x;
+                mouse_report->y = y;
+        }
+}
+
+void keyboard_post_init_user(void) {
+        lock_state = host_keyboard_led_state().num_lock;
+}
+
+bool led_update_user(led_t led_state) {
+        static uint8_t lock_count = 0;
+        static uint16_t scroll_timer = 0;
+
+        if (timer_elapsed(scroll_timer) > 25) {
+                scroll_timer = timer_read();
+                lock_count = 0;
+        }
+    
+        if (led_state.num_lock != lock_state) {
+                lock_count++;
+
+                if (lock_count == 2) {
+                        scroll_enabled = !scroll_enabled;
+                        lock_count = 0;
+                        delta_x = 0;
+                        delta_y = 0;
+                }
+        }
+    
+        lock_state = led_state.num_lock;
+        return true;
+}
diff --git a/keyboards/ploopyco/trackball_nano/keymaps/maddie/readme.md b/keyboards/ploopyco/trackball_nano/keymaps/maddie/readme.md
new file mode 100644
index 000000000..3a597e38d
--- /dev/null
+++ b/keyboards/ploopyco/trackball_nano/keymaps/maddie/readme.md
@@ -0,0 +1 @@
+toggles scroll mode when numlock is double-tapped within 25ms. add a macro or something, unless you have ungodly fast fingers.