[Keyboard] Bugfixes and Readme additions for PloopyCo devices (#13043)

3 files changed, 51 insertions, 0 deletions

diff --git a/keyboards/ploopyco/trackball_mini/readme.md b/keyboards/ploopyco/trackball_mini/readme.md
index 1858efb6e2..3c21a57cfd 100644
--- a/keyboards/ploopyco/trackball_mini/readme.md
+++ b/keyboards/ploopyco/trackball_mini/readme.md
@@ -64,6 +64,17 @@ The `PLOOPY_DPI_OPTIONS` array sets the values that you want to be able to cycle
 
 The `DPI_CONFIG` macro will cycle through the values in the array, each time you hit it.  It stores this value in persistent memory, so it will load it the next time the device powers up.
 
+## Drag Scroll
+
+Drag Sroll is a custom keycode for the Ploopy devices that allow you to hold or tap a button and have the mouse movement translate into scrolling instead. 
+
+Nothing needs to be enabled to use this functionality.  Just add the `DRAG_SCROLL` to your keymap. 
+
+### Drag Scroll Configuration
+
+* `#define PLOOPY_DRAGSCROLL_MOMENTARY` - Makes the key into a momentary key, rather than a toggle.
+* `#define PLOOPY_DRAGSCROLL_DPI CPI375` - When the fixed DPI option is enabled, this sets the DPI to be used for Drag Scroll.
+* `#define PLOOPY_DRAGSCROLL_INVERT` - This reverses the direction that the scroll is performed. 
 ## Fuse settings
 
 When flashing the bootloader, use the following fuse settings:
diff --git a/keyboards/ploopyco/trackball_mini/trackball_mini.c b/keyboards/ploopyco/trackball_mini/trackball_mini.c
index 996c00b22a..b50850b549 100644
--- a/keyboards/ploopyco/trackball_mini/trackball_mini.c
+++ b/keyboards/ploopyco/trackball_mini/trackball_mini.c
@@ -40,6 +40,13 @@
 #define PLOOPY_DPI_OPTIONS { CPI375, CPI750, CPI1375 }
 #define PLOOPY_DPI_DEFAULT 2
 
+#ifndef PLOOPY_DRAGSCROLL_DPI
+#    define PLOOPY_DRAGSCROLL_DPI CPI375 // Fixed-DPI Drag Scroll
+#endif
+#ifndef PLOOPY_DRAGSCROLL_MULTIPLIER
+#    define PLOOPY_DRAGSCROLL_MULTIPLIER 0.75 // Variable-DPI Drag Scroll
+#endif
+
 // Transformation constants for delta-X and delta-Y
 const static float ADNS_X_TRANSFORM = -1.0;
 const static float ADNS_Y_TRANSFORM = 1.0;
@@ -61,6 +68,7 @@ uint16_t lastScroll = 0;  // Previous confirmed wheel event
 uint16_t lastMidClick = 0;  // Stops scrollwheel from being read if it was pressed
 uint8_t OptLowPin = OPT_ENC1;
 bool debug_encoder = false;
+bool     is_drag_scroll    = false;
 
 __attribute__((weak)) void process_wheel_user(report_mouse_t* mouse_report, int16_t h, int16_t v) {
     mouse_report->h = h;
@@ -142,6 +150,16 @@ bool process_record_kb(uint16_t keycode, keyrecord_t* record) {
         adns_set_cpi(dpi_array[keyboard_config.dpi_config]);
     }
 
+    if (keycode == DRAG_SCROLL) {
+#ifndef PLOOPY_DRAGSCROLL_MOMENTARY
+        if (record->event.pressed)
+#endif
+        {
+            is_drag_scroll ^= 1;
+        }
+        adns_set_cpi(is_drag_scroll ? PLOOPY_DRAGSCROLL_DPI : dpi_array[keyboard_config.dpi_config]);
+    }
+
 /* If Mousekeys is disabled, then use handle the mouse button
  * keycodes.  This makes things simpler, and allows usage of
  * the keycodes in a consistent manner.  But only do this if
@@ -214,6 +232,19 @@ void pointing_device_task(void) {
     report_mouse_t mouse_report = pointing_device_get_report();
     process_wheel(&mouse_report);
     process_mouse(&mouse_report);
+
+    if (is_drag_scroll) {
+        mouse_report.h = mouse_report.x;
+#ifdef PLOOPY_DRAGSCROLL_INVERT
+        // Invert vertical scroll direction
+        mouse_report.v = -mouse_report.y;
+#else
+        mouse_report.v = mouse_report.y;
+#endif
+        mouse_report.x = 0;
+        mouse_report.y = 0;
+    }
+
     pointing_device_set_report(mouse_report);
     pointing_device_send();
 }
diff --git a/keyboards/ploopyco/trackball_mini/trackball_mini.h b/keyboards/ploopyco/trackball_mini/trackball_mini.h
index b9754cbc72..a12d12a0c8 100644
--- a/keyboards/ploopyco/trackball_mini/trackball_mini.h
+++ b/keyboards/ploopyco/trackball_mini/trackball_mini.h
@@ -49,6 +49,15 @@ typedef union {
 extern keyboard_config_t keyboard_config;
 
 enum ploopy_keycodes {
+#ifdef VIA_ENABLE
+    DPI_CONFIG = USER00,
+#else
     DPI_CONFIG = SAFE_RANGE,
+#endif
+    DRAG_SCROLL,
+#ifdef VIA_ENABLE
+    PLOOPY_SAFE_RANGE = SAFE_RANGE,
+#else
     PLOOPY_SAFE_RANGE,
+#endif
 };