src/video/android/SDL_androidtouch.c

   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
  23 #if SDL_VIDEO_DRIVER_ANDROID
  24
  25 #include <android/log.h>
  26
  27 #include "SDL_hints.h"
  28 #include "SDL_events.h"
  29 #include "SDL_log.h"
  30 #include "SDL_androidtouch.h"
  31 #include "../../events/SDL_mouse_c.h"
  32 #include "../../events/SDL_touch_c.h"
  33 #include "../../core/android/SDL_android.h"
  34
  35 #define ACTION_DOWN 0
  36 #define ACTION_UP 1
  37 #define ACTION_MOVE 2
  38 #define ACTION_CANCEL 3
  39 #define ACTION_OUTSIDE 4
  40 #define ACTION_POINTER_DOWN 5
  41 #define ACTION_POINTER_UP 6
  42
  43 static void Android_GetWindowCoordinates(float x, float y,
  44                                          int *window_x, int *window_y)
  45 {
  46     int window_w, window_h;
  47
  48     SDL_GetWindowSize(Android_Window, &window_w, &window_h);
  49     *window_x = (int)(x * window_w);
  50     *window_y = (int)(y * window_h);
  51 }
  52
  53 static SDL_bool separate_mouse_and_touch = SDL_FALSE;
  54
  55 static void SDLCALL
  56 SeparateEventsHintWatcher(void *userdata, const char *name,
  57                           const char *oldValue, const char *newValue)
  58 {
  59     separate_mouse_and_touch = (newValue && (SDL_strcmp(newValue, "1") == 0));
  60
  61     Android_JNI_SetSeparateMouseAndTouch(separate_mouse_and_touch);
  62 }
  63
  64 void Android_InitTouch(void)
  65 {
  66     int i;
  67     int* ids;
  68     const int number = Android_JNI_GetTouchDeviceIds(&ids);
  69
  70     SDL_AddHintCallback(SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH,
  71                         SeparateEventsHintWatcher, NULL);
  72
  73     if (0 < number) {
  74         for (i = 0; i < number; ++i) {
  75             SDL_AddTouch((SDL_TouchID) ids[i], ""); /* no error handling */
  76         }
  77         SDL_free(ids);
  78     }
  79 }
  80
  81 void Android_QuitTouch(void)
  82 {
  83     SDL_DelHintCallback(SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH,
  84                         SeparateEventsHintWatcher, NULL);
  85     separate_mouse_and_touch = SDL_FALSE;
  86 }
  87
  88 void Android_OnTouch(int touch_device_id_in, int pointer_finger_id_in, int action, float x, float y, float p)
  89 {
  90     SDL_TouchID touchDeviceId = 0;
  91     SDL_FingerID fingerId = 0;
  92     int window_x, window_y;
  93     static SDL_FingerID pointerFingerID = 0;
  94
  95     if (!Android_Window) {
  96         return;
  97     }
  98
  99     touchDeviceId = (SDL_TouchID)touch_device_id_in;
 100     if (SDL_AddTouch(touchDeviceId, "") < 0) {
 101         SDL_Log("error: can't add touch %s, %d", __FILE__, __LINE__);
 102     }
 103
 104     fingerId = (SDL_FingerID)pointer_finger_id_in;
 105     switch (action) {
 106         case ACTION_DOWN:
 107             /* Primary pointer down */
 108             if (!separate_mouse_and_touch) {
 109                 Android_GetWindowCoordinates(x, y, &window_x, &window_y);
 110                 /* send moved event */
 111                 SDL_SendMouseMotion(Android_Window, SDL_TOUCH_MOUSEID, 0, window_x, window_y);
 112                 /* send mouse down event */
 113                 SDL_SendMouseButton(Android_Window, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT);
 114             }
 115             pointerFingerID = fingerId;
 116         case ACTION_POINTER_DOWN:
 117             /* Non primary pointer down */
 118             SDL_SendTouch(touchDeviceId, fingerId, SDL_TRUE, x, y, p);
 119             break;
 120
 121         case ACTION_MOVE:
 122             if (!pointerFingerID) {
 123                 if (!separate_mouse_and_touch) {
 124                     Android_GetWindowCoordinates(x, y, &window_x, &window_y);
 125                     /* send moved event */
 126                     SDL_SendMouseMotion(Android_Window, SDL_TOUCH_MOUSEID, 0, window_x, window_y);
 127                 }
 128             }
 129             SDL_SendTouchMotion(touchDeviceId, fingerId, x, y, p);
 130             break;
 131
 132         case ACTION_UP:
 133             /* Primary pointer up */
 134             if (!separate_mouse_and_touch) {
 135                 /* send mouse up */
 136                 SDL_SendMouseButton(Android_Window, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT);
 137             }
 138             pointerFingerID = (SDL_FingerID) 0;
 139         case ACTION_POINTER_UP:
 140             /* Non primary pointer up */
 141             SDL_SendTouch(touchDeviceId, fingerId, SDL_FALSE, x, y, p);
 142             break;
 143
 144         default:
 145             break;
 146     }
 147 }
 148
 149 #endif /* SDL_VIDEO_DRIVER_ANDROID */
 150
 151 /* vi: set ts=4 sw=4 expandtab: */