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142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_touch.h
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*
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* Include file for SDL touch event handling.
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*/
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#ifndef SDL_touch_h_
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#define SDL_touch_h_
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "SDL_video.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef Sint64 SDL_TouchID;
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typedef Sint64 SDL_FingerID;
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typedef enum
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{
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SDL_TOUCH_DEVICE_INVALID = -1,
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SDL_TOUCH_DEVICE_DIRECT, /* touch screen with window-relative coordinates */
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SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, /* trackpad with absolute device coordinates */
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SDL_TOUCH_DEVICE_INDIRECT_RELATIVE /* trackpad with screen cursor-relative coordinates */
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} SDL_TouchDeviceType;
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typedef struct SDL_Finger
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{
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SDL_FingerID id;
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float x;
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float y;
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float pressure;
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} SDL_Finger;
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/* Used as the device ID for mouse events simulated with touch input */
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#define SDL_TOUCH_MOUSEID ((Uint32)-1)
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/* Used as the SDL_TouchID for touch events simulated with mouse input */
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#define SDL_MOUSE_TOUCHID ((Sint64)-1)
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/**
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* Get the number of registered touch devices.
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*
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* On some platforms SDL first sees the touch device if it was actually used.
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* Therefore SDL_GetNumTouchDevices() may return 0 although devices are
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* available. After using all devices at least once the number will be
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* correct.
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*
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* This was fixed for Android in SDL 2.0.1.
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*
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* \returns the number of registered touch devices.
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*
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* \since This function is available since SDL 2.0.0.
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*
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* \sa SDL_GetTouchDevice
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*/
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extern DECLSPEC int SDLCALL SDL_GetNumTouchDevices(void);
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/**
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* Get the touch ID with the given index.
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*
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* \param index the touch device index
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* \returns the touch ID with the given index on success or 0 if the index is
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* invalid; call SDL_GetError() for more information.
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*
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* \since This function is available since SDL 2.0.0.
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*
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* \sa SDL_GetNumTouchDevices
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*/
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extern DECLSPEC SDL_TouchID SDLCALL SDL_GetTouchDevice(int index);
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/**
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* Get the type of the given touch device.
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*
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* \since This function is available since SDL 2.0.10.
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*/
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extern DECLSPEC SDL_TouchDeviceType SDLCALL SDL_GetTouchDeviceType(SDL_TouchID touchID);
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/**
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* Get the number of active fingers for a given touch device.
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*
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* \param touchID the ID of a touch device
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* \returns the number of active fingers for a given touch device on success
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* or 0 on failure; call SDL_GetError() for more information.
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*
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* \since This function is available since SDL 2.0.0.
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*
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* \sa SDL_GetTouchFinger
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*/
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extern DECLSPEC int SDLCALL SDL_GetNumTouchFingers(SDL_TouchID touchID);
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/**
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* Get the finger object for specified touch device ID and finger index.
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*
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* The returned resource is owned by SDL and should not be deallocated.
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*
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* \param touchID the ID of the requested touch device
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* \param index the index of the requested finger
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* \returns a pointer to the SDL_Finger object or NULL if no object at the
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* given ID and index could be found.
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*
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* \since This function is available since SDL 2.0.0.
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*
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* \sa SDL_RecordGesture
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*/
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extern DECLSPEC SDL_Finger * SDLCALL SDL_GetTouchFinger(SDL_TouchID touchID, int index);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* SDL_touch_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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