SDL_PenButtonEvent.3type - Man Page

Defined in SDL3/SDL_events.h

#include "SDL3/SDL.h"

typedef struct SDL_PenButtonEvent
{
    SDL_EventType type; /**< SDL_EVENT_PEN_BUTTON_DOWN or SDL_EVENT_PEN_BUTTON_UP */
    Uint32 reserved;
    Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
    SDL_WindowID windowID; /**< The window with mouse focus, if any */
    SDL_PenID which;        /**< The pen instance id */
    SDL_PenInputFlags pen_state;   /**< Complete pen input state at time of event */
    float x;                /**< X coordinate, relative to window */
    float y;                /**< Y coordinate, relative to window */
    Uint8 button;       /**< The pen button index (first button is 1). */
    bool down;      /**< true if the button is pressed */
} SDL_PenButtonEvent;

This is for buttons on the pen itself that the user might click. The pen itself pressing down to draw triggers a

SDL_EVENT_PEN_DOWN
event instead.

This struct is available since SDL 3.2.0.