src/video/android/SDL_androidtouch.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 15 Feb 2013 08:47:44 -0800
changeset 6885 700f1b25f77f
parent 6651 17ef8a7cab55
child 6950 1ddb72193079
permissions -rw-r--r--
Happy New Year!
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_ANDROID
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#include <android/log.h>
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#include "SDL_events.h"
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#include "../../events/SDL_mouse_c.h"
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#include "../../events/SDL_touch_c.h"
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#include "SDL_androidtouch.h"
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#define ACTION_DOWN 0
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#define ACTION_UP 1
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#define ACTION_MOVE 2
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#define ACTION_CANCEL 3
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#define ACTION_OUTSIDE 4
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// The following two are deprecated but it seems they are still emitted (instead the corresponding ACTION_UP/DOWN) as of Android 3.2
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#define ACTION_POINTER_1_DOWN 5
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#define ACTION_POINTER_1_UP 6
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static SDL_FingerID leftFingerDown = 0;
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static void Android_GetWindowCoordinates(float x, float y,
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                                         int *window_x, int *window_y)
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{
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    int window_w, window_h;
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    SDL_GetWindowSize(Android_Window, &window_w, &window_h);
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    *window_x = (int)(x * window_w);
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    *window_y = (int)(y * window_h);
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}
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void Android_OnTouch(int touch_device_id_in, int pointer_finger_id_in, int action, float x, float y, float p) 
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{
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    SDL_TouchID touchDeviceId = 0;
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    SDL_FingerID fingerId = 0;
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    int window_x, window_y;
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    if (!Android_Window) {
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        return;
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    }
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    touchDeviceId = (SDL_TouchID)touch_device_id_in;
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    if (!SDL_GetTouch(touchDeviceId)) {
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        SDL_Touch touch;
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        memset( &touch, 0, sizeof(touch) );
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        touch.id = touchDeviceId;
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        touch.x_min = 0.0f;
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        touch.x_max = 1.0f;
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        touch.native_xres = touch.x_max - touch.x_min;
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        touch.y_min = 0.0f;
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        touch.y_max = 1.0f;
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        touch.native_yres = touch.y_max - touch.y_min;
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        touch.pressure_min = 0.0f;
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        touch.pressure_max = 1.0f;
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        touch.native_pressureres = touch.pressure_max - touch.pressure_min;
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        if (SDL_AddTouch(&touch, "") < 0) {
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             SDL_Log("error: can't add touch %s, %d", __FILE__, __LINE__);
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        }
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    }
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    fingerId = (SDL_FingerID)pointer_finger_id_in;
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    switch (action) {
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        case ACTION_DOWN:
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        case ACTION_POINTER_1_DOWN:
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            if (!leftFingerDown) {
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                Android_GetWindowCoordinates(x, y, &window_x, &window_y);
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                /* send moved event */
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                SDL_SendMouseMotion(NULL, 0, window_x, window_y);
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                /* send mouse down event */
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                SDL_SendMouseButton(NULL, SDL_PRESSED, SDL_BUTTON_LEFT);
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                leftFingerDown = fingerId;
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            }
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            SDL_SendFingerDown(touchDeviceId, fingerId, SDL_TRUE, x, y, p);
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            break;
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        case ACTION_MOVE:
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            if (!leftFingerDown) {
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                Android_GetWindowCoordinates(x, y, &window_x, &window_y);
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                /* send moved event */
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                SDL_SendMouseMotion(NULL, 0, window_x, window_y);
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            }
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            SDL_SendTouchMotion(touchDeviceId, fingerId, SDL_FALSE, x, y, p);
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            break;
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        case ACTION_UP:
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        case ACTION_POINTER_1_UP:
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            if (fingerId == leftFingerDown) {
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                /* send mouse up */
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                SDL_SendMouseButton(NULL, SDL_RELEASED, SDL_BUTTON_LEFT);
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                leftFingerDown = 0;
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            }
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            SDL_SendFingerDown(touchDeviceId, fingerId, SDL_FALSE, x, y, p);
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            break;
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        default:
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            break;
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    } 
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}
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#endif /* SDL_VIDEO_DRIVER_ANDROID */
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/* vi: set ts=4 sw=4 expandtab: */