Atlas - SDL_androidpen.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 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#ifdef SDL_VIDEO_DRIVER_ANDROID
24
25#include "SDL_androidpen.h"
26#include "../../events/SDL_pen_c.h"
27#include "../../core/android/SDL_android.h"
28
29#define ACTION_DOWN   0
30#define ACTION_UP     1
31#define ACTION_CANCEL 3
32#define ACTION_POINTER_DOWN 5
33#define ACTION_POINTER_UP   6
34#define ACTION_HOVER_ENTER  9
35#define ACTION_HOVER_EXIT   10
36
37void Android_OnPen(SDL_Window *window, int pen_id_in, SDL_PenDeviceType device_type, int button, int action, float x, float y, float p)
38{
39    if (!window) {
40        return;
41    }
42
43    // pointer index starts from zero.
44    pen_id_in++;
45
46    SDL_PenID pen = SDL_FindPenByHandle((void *) (size_t) pen_id_in);
47    if (!pen) {
48        // TODO: Query JNI for pen device info
49        SDL_PenInfo peninfo;
50        SDL_zero(peninfo);
51        peninfo.capabilities = SDL_PEN_CAPABILITY_PRESSURE | SDL_PEN_CAPABILITY_ERASER;
52        peninfo.num_buttons = 2;
53        peninfo.subtype = SDL_PEN_TYPE_PEN;
54        peninfo.device_type = device_type;
55        pen = SDL_AddPenDevice(0, NULL, window, &peninfo, (void *) (size_t) pen_id_in, true);
56        if (!pen) {
57            SDL_Log("error: can't add a pen device %d", pen_id_in);
58            return;
59        }
60    }
61
62    SDL_SendPenMotion(0, pen, window, x, y);
63    SDL_SendPenAxis(0, pen, window, SDL_PEN_AXIS_PRESSURE, p);
64    // TODO: add more axis
65
66    SDL_PenInputFlags current = SDL_GetPenStatus(pen, NULL, 0);
67    int diff = current ^ button;
68    if (diff != 0) {
69        // Android only exposes BUTTON_STYLUS_PRIMARY and BUTTON_STYLUS_SECONDARY
70        if (diff & SDL_PEN_INPUT_BUTTON_1)
71            SDL_SendPenButton(0, pen, window, 1, (button & SDL_PEN_INPUT_BUTTON_1) != 0);
72
73        if (diff & SDL_PEN_INPUT_BUTTON_2)
74            SDL_SendPenButton(0, pen, window, 2, (button & SDL_PEN_INPUT_BUTTON_2) != 0);
75    }
76
77    // button contains DOWN/ERASER_TIP on DOWN/UP regardless of pressed state, use action to distinguish
78    // we don't compare tip flags above because MotionEvent.getButtonState doesn't return stylus tip/eraser state.
79    switch (action) {
80    case ACTION_HOVER_ENTER:
81        SDL_SendPenProximity(0, pen, window, true);
82        break;
83
84    case ACTION_CANCEL:
85    case ACTION_HOVER_EXIT:  // strictly speaking, this can mean both "proximity out" and "left the View" but close enough.
86        SDL_SendPenProximity(0, pen, window, false);
87        break;
88
89    case ACTION_DOWN:
90    case ACTION_POINTER_DOWN:
91        SDL_SendPenTouch(0, pen, window, (button & SDL_PEN_INPUT_ERASER_TIP) != 0, true);
92        break;
93
94    case ACTION_UP:
95    case ACTION_POINTER_UP:
96        SDL_SendPenTouch(0, pen, window, (button & SDL_PEN_INPUT_ERASER_TIP) != 0, false);
97        break;
98
99    default:
100        break;
101    }
102}
103
104#endif // SDL_VIDEO_DRIVER_ANDROID
105
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