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SDL_androidmouse.c (6828B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 
     22 #include "../../SDL_internal.h"
     23 
     24 #if SDL_VIDEO_DRIVER_ANDROID
     25 
     26 #include "SDL_androidmouse.h"
     27 
     28 #include "SDL_events.h"
     29 #include "../../events/SDL_mouse_c.h"
     30 
     31 #include "../../core/android/SDL_android.h"
     32 
     33 /* See Android's MotionEvent class for constants */
     34 #define ACTION_DOWN 0
     35 #define ACTION_UP 1
     36 #define ACTION_MOVE 2
     37 #define ACTION_HOVER_MOVE 7
     38 #define ACTION_SCROLL 8
     39 #define BUTTON_PRIMARY 1
     40 #define BUTTON_SECONDARY 2
     41 #define BUTTON_TERTIARY 4
     42 #define BUTTON_BACK 8
     43 #define BUTTON_FORWARD 16
     44 
     45 typedef struct
     46 {
     47     int custom_cursor;
     48     int system_cursor;
     49 
     50 } SDL_AndroidCursorData;
     51 
     52 /* Last known Android mouse button state (includes all buttons) */
     53 static int last_state;
     54 
     55 /* Blank cursor */
     56 static SDL_Cursor *empty_cursor;
     57 
     58 static SDL_Cursor *
     59 Android_WrapCursor(int custom_cursor, int system_cursor)
     60 {
     61     SDL_Cursor *cursor;
     62 
     63     cursor = SDL_calloc(1, sizeof(*cursor));
     64     if (cursor) {
     65         SDL_AndroidCursorData *data = (SDL_AndroidCursorData *)SDL_calloc(1, sizeof(*data));
     66         if (data) {
     67             data->custom_cursor = custom_cursor;
     68             data->system_cursor = system_cursor;
     69             cursor->driverdata = data;
     70         } else {
     71             SDL_free(cursor);
     72             cursor = NULL;
     73             SDL_OutOfMemory();
     74         }
     75     } else {
     76         SDL_OutOfMemory();
     77     }
     78 
     79     return cursor;
     80 }
     81 
     82 static SDL_Cursor *
     83 Android_CreateDefaultCursor()
     84 {
     85     return Android_WrapCursor(0, SDL_SYSTEM_CURSOR_ARROW);
     86 }
     87 
     88 static SDL_Cursor *
     89 Android_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
     90 {
     91     int custom_cursor;
     92     SDL_Surface *converted;
     93 
     94     converted = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ARGB8888, 0);
     95     if (!converted) {
     96         return NULL;
     97     }
     98     custom_cursor = Android_JNI_CreateCustomCursor(converted, hot_x, hot_y);
     99     SDL_FreeSurface(converted);
    100     if (!custom_cursor) {
    101         SDL_Unsupported();
    102         return NULL;
    103     }
    104     return Android_WrapCursor(custom_cursor, 0);
    105 }
    106 
    107 static SDL_Cursor *
    108 Android_CreateSystemCursor(SDL_SystemCursor id)
    109 {
    110     return Android_WrapCursor(0, id);
    111 }
    112 
    113 static void
    114 Android_FreeCursor(SDL_Cursor * cursor)
    115 {
    116     SDL_free(cursor->driverdata);
    117     SDL_free(cursor);
    118 }
    119 
    120 static SDL_Cursor *
    121 Android_CreateEmptyCursor()
    122 {
    123     if (!empty_cursor) {
    124         SDL_Surface *empty_surface = SDL_CreateRGBSurfaceWithFormat(0, 1, 1, 32, SDL_PIXELFORMAT_ARGB8888);
    125         if (empty_surface) {
    126             SDL_memset(empty_surface->pixels, 0, empty_surface->h * empty_surface->pitch);
    127             empty_cursor = Android_CreateCursor(empty_surface, 0, 0);
    128             SDL_FreeSurface(empty_surface);
    129         }
    130     }
    131     return empty_cursor;
    132 }
    133 
    134 static void
    135 Android_DestroyEmptyCursor()
    136 {
    137     if (empty_cursor) {
    138         Android_FreeCursor(empty_cursor);
    139         empty_cursor = NULL;
    140     }
    141 }
    142 
    143 static int
    144 Android_ShowCursor(SDL_Cursor *cursor)
    145 {
    146     if (!cursor) {
    147         cursor = Android_CreateEmptyCursor();
    148     }
    149     if (cursor) {
    150         SDL_AndroidCursorData *data = (SDL_AndroidCursorData *)cursor->driverdata;
    151         if (data->custom_cursor) {
    152             if (!Android_JNI_SetCustomCursor(data->custom_cursor)) {
    153                 return SDL_Unsupported();
    154             }
    155         } else {
    156             if (!Android_JNI_SetSystemCursor(data->system_cursor)) {
    157                 return SDL_Unsupported();
    158             }
    159         }
    160         return 0;
    161     } else {
    162         /* SDL error set inside Android_CreateEmptyCursor() */
    163         return -1;
    164     }
    165 }
    166 
    167 static int
    168 Android_SetRelativeMouseMode(SDL_bool enabled)
    169 {
    170     if (!Android_JNI_SupportsRelativeMouse()) {
    171         return SDL_Unsupported();
    172     }
    173 
    174     if (!Android_JNI_SetRelativeMouseEnabled(enabled)) {
    175         return SDL_Unsupported();
    176     }
    177 
    178     return 0;
    179 }
    180 
    181 void
    182 Android_InitMouse(void)
    183 {
    184     SDL_Mouse *mouse = SDL_GetMouse();
    185 
    186     mouse->CreateCursor = Android_CreateCursor;
    187     mouse->CreateSystemCursor = Android_CreateSystemCursor;
    188     mouse->ShowCursor = Android_ShowCursor;
    189     mouse->FreeCursor = Android_FreeCursor;
    190     mouse->SetRelativeMouseMode = Android_SetRelativeMouseMode;
    191 
    192     SDL_SetDefaultCursor(Android_CreateDefaultCursor());
    193 
    194     last_state = 0;
    195 }
    196 
    197 void
    198 Android_QuitMouse(void)
    199 {
    200     Android_DestroyEmptyCursor();
    201 }
    202 
    203 /* Translate Android mouse button state to SDL mouse button */
    204 static Uint8
    205 TranslateButton(int state)
    206 {
    207     if (state & BUTTON_PRIMARY) {
    208         return SDL_BUTTON_LEFT;
    209     } else if (state & BUTTON_SECONDARY) {
    210         return SDL_BUTTON_RIGHT;
    211     } else if (state & BUTTON_TERTIARY) {
    212         return SDL_BUTTON_MIDDLE;
    213     } else if (state & BUTTON_FORWARD) {
    214         return SDL_BUTTON_X1;
    215     } else if (state & BUTTON_BACK) {
    216         return SDL_BUTTON_X2;
    217     } else {
    218         return 0;
    219     }
    220 }
    221 
    222 void
    223 Android_OnMouse(SDL_Window *window, int state, int action, float x, float y, SDL_bool relative)
    224 {
    225     int changes;
    226     Uint8 button;
    227 
    228     if (!window) {
    229         return;
    230     }
    231 
    232     switch(action) {
    233         case ACTION_DOWN:
    234             changes = state & ~last_state;
    235             button = TranslateButton(changes);
    236             last_state = state;
    237             SDL_SendMouseMotion(window, 0, relative, (int)x, (int)y);
    238             SDL_SendMouseButton(window, 0, SDL_PRESSED, button);
    239             break;
    240 
    241         case ACTION_UP:
    242             changes = last_state & ~state;
    243             button = TranslateButton(changes);
    244             last_state = state;
    245             SDL_SendMouseMotion(window, 0, relative, (int)x, (int)y);
    246             SDL_SendMouseButton(window, 0, SDL_RELEASED, button);
    247             break;
    248 
    249         case ACTION_MOVE:
    250         case ACTION_HOVER_MOVE:
    251             SDL_SendMouseMotion(window, 0, relative, (int)x, (int)y);
    252             break;
    253 
    254         case ACTION_SCROLL:
    255             SDL_SendMouseWheel(window, 0, x, y, SDL_MOUSEWHEEL_NORMAL);
    256             break;
    257 
    258         default:
    259             break;
    260     }
    261 }
    262 
    263 #endif /* SDL_VIDEO_DRIVER_ANDROID */
    264 
    265 /* vi: set ts=4 sw=4 expandtab: */
    266