Atlas - SDL_androidtouch.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
43static 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
53static SDL_bool separate_mouse_and_touch = SDL_FALSE;
54
55static void SDLCALL
56SeparateEventsHintWatcher(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
64void 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
81void 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
88void 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: */
152
[FILE END]
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