# MOUSE_WHEEL

- **Language:** C
- **Kind:** constant
- **Source:** https://github.com/tmux/tmux/blob/e476c1230b958df0cb12977517d24b3dc931375b/tmux.h#L1580
- **Page:** https://libtmux.org/en/tmux/latest/reference/c-define-tmux-h-mouse_wheel/

```c
#define MOUSE_WHEEL(b) (((b) & MOUSE_MASK_BUTTONS) == MOUSE_WHEEL_UP || \
 ((b) & MOUSE_MASK_BUTTONS) == MOUSE_WHEEL_DOWN)
```

## Referenced by

- [`menu_key_cb`](/en/tmux/latest/reference/c-function-menu_key_cb/) (function)
- [`server_client_check_mouse`](/en/tmux/latest/reference/c-function-server-client-c-server_client_check_mouse/) (function)
- [`tty_keys_mouse`](/en/tmux/latest/reference/c-function-tty-keys-c-tty_keys_mouse/) (function)
- [`window_copy_command`](/en/tmux/latest/reference/c-function-window-copy-c-window_copy_command/) (function)

## Referenced declarations

- [`MOUSE_MASK_BUTTONS`](/en/tmux/latest/reference/c-define-tmux-h-mouse_mask_buttons/) (constant)
- [`MOUSE_WHEEL_DOWN`](/en/tmux/latest/reference/c-define-tmux-h-mouse_wheel_down/) (constant)
- [`MOUSE_WHEEL_UP`](/en/tmux/latest/reference/c-define-tmux-h-mouse_wheel_up/) (constant)