[Docs] Add drag scrolling example to Pointing device docs page (#15715)

Co-authored-by: Dasky <32983009+daskygit@users.noreply.github.com>
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Drashna Jaelre 2022-01-06 00:30:22 -08:00 committed by GitHub
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@ -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.