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| -rw-r--r-- | docs/feature_pointing_device.md | 36 |
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. |