src/events/SDL_touch_c.h
author Alex Szpakowski <slime73@gmail.com>
Sat, 10 Nov 2018 16:15:48 -0400
changeset 12404 eb60e952b13f
parent 11811 5d94cb6b24d3
child 12503 806492103856
permissions -rw-r--r--
Add SDL_TouchDeviceType enum and SDL_GetTouchDeviceType(SDL_TouchID id).

Touch device types include SDL_TOUCH_DEVICE_DIRECT (a touch screen with window-relative coordinates for touches), SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE (a trackpad-style device with absolute device coordinates), and SDL_TOUCH_DEVICE_INDIRECT_RELATIVE (a trackpad-style device with screen cursor-relative coordinates).

Phone screens are an example of a direct device type. Mac trackpads are the indirect-absolute touch device type. The Apple TV remote is an indirect-relative touch device type.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../SDL_internal.h"
    22 #include "../../include/SDL_touch.h"
    23 
    24 #ifndef SDL_touch_c_h_
    25 #define SDL_touch_c_h_
    26 
    27 typedef struct SDL_Touch
    28 {
    29     SDL_TouchID id;
    30     SDL_TouchDeviceType type;
    31     int num_fingers;
    32     int max_fingers;
    33     SDL_Finger** fingers;
    34 } SDL_Touch;
    35 
    36 
    37 /* Initialize the touch subsystem */
    38 extern int SDL_TouchInit(void);
    39 
    40 /* Add a touch, returning the index of the touch, or -1 if there was an error. */
    41 extern int SDL_AddTouch(SDL_TouchID id, SDL_TouchDeviceType type, const char *name);
    42 
    43 /* Get the touch with a given id */
    44 extern SDL_Touch *SDL_GetTouch(SDL_TouchID id);
    45 
    46 /* Send a touch down/up event for a touch */
    47 extern int SDL_SendTouch(SDL_TouchID id, SDL_FingerID fingerid,
    48                          SDL_bool down, float x, float y, float pressure);
    49 
    50 /* Send a touch motion event for a touch */
    51 extern int SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid,
    52                                float x, float y, float pressure);
    53 
    54 /* Remove a touch */
    55 extern void SDL_DelTouch(SDL_TouchID id);
    56 
    57 /* Shutdown the touch subsystem */
    58 extern void SDL_TouchQuit(void);
    59 
    60 #endif /* SDL_touch_c_h_ */
    61 
    62 /* vi: set ts=4 sw=4 expandtab: */