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-rw-r--r--docs/feature_pointing_device.md36
1 files changed, 34 insertions, 2 deletions
diff --git a/docs/feature_pointing_device.md b/docs/feature_pointing_device.md
index bd7fb36589..098a787ed8 100644
--- a/docs/feature_pointing_device.md
+++ b/docs/feature_pointing_device.md
@@ -220,9 +220,11 @@ Additionally, by default, `pointing_device_send()` will only send a report when
Also, you use the `has_mouse_report_changed(new, old)` function to check to see if the report has changed.
-## Example
+## Examples
-In the following example, a custom key is used to click the mouse and scroll 127 units vertically and horizontally, then undo all of that when released - because that's a totally useful function. Listen, this is an example:
+### Custom Mouse Keycode
+
+In this example, a custom key is used to click the mouse and scroll 127 units vertically and horizontally, then undo all of that when released - because that's a totally useful function.
```c
case MS_SPECIAL:
@@ -242,3 +244,33 @@ case MS_SPECIAL:
```
Recall that the mouse report is set to zero (except the buttons) whenever it is sent, so the scrolling would only occur once in each case.
+
+### Drag Scroll or Mouse Scroll
+
+A very common implementation is to use the mouse movement to scroll instead of moving the cursor on the system. This uses the `pointing_device_task_user` callback to intercept and modify the mouse report before it's sent to the host system.
+
+```c
+enum custom_keycodes {
+ DRAG_SCROLL = SAFE_RANGE,
+};
+
+bool set_scrolling = false;
+
+report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
+ if (set_scrolling) {
+ mouse_report.h = mouse_report.x;
+ mouse_report.v = mouse_report.y;
+ mouse_report.x = mouse_report.y = 0
+ }
+ return mouse_report;
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+ if (keycode == DRAG_SCROLL && record->event.pressed) {
+ set_scrolling = !set_scrolling;
+ }
+ return true;
+}
+```
+
+This allows you to toggle between scrolling and cursor movement by pressing the DRAG_SCROLL key.