firmware/target/hosted/android/button-android.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (c) 2010 Thomas Martitz
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22
  23 #include <jni.h>
  24 #include <stdbool.h>
  25 #include "config.h"
  26 #include "kernel.h"
  27 #include "system.h"
  28
  29 static long last_touch;
  30 static int last_y, last_x;
  31
  32 static enum {
  33     STATE_UNKNOWN,
  34     STATE_UP,
  35     STATE_DOWN,
  36 } last_state = STATE_UNKNOWN;
  37
  38
  39 /*
  40  * this writes in an interrupt-like fashion the last pixel coordinates
  41  * that the user pressed on the screen */
  42 JNIEXPORT void JNICALL
  43 Java_org_rockbox_RockboxFramebuffer_pixelHandler(JNIEnv*env, jobject this,
  44                                                         int x, int y)
  45 {
  46     last_x = x;
  47     last_y = y;
  48     last_touch = current_tick;
  49 }
  50
  51 /*
  52  * this notifies us in an interrupt-like fashion whether the user just
  53  * began or stopped the touch action */
  54 JNIEXPORT void JNICALL
  55 Java_org_rockbox_RockboxFramebuffer_touchHandler(JNIEnv*env, jobject this,
  56                                                         int down)
  57 {
  58     if (down)
  59         last_state = STATE_DOWN;
  60     else
  61         last_state = STATE_UP;
  62 }
  63
  64 void button_init_device(void)
  65 {
  66     last_touch = current_tick;
  67 }
  68
  69 int button_read_device(int *data)
  70 {
  71     /* get grid button/coordinates based on the current touchscreen mode */
  72     int btn = touchscreen_to_pixels(last_x, last_y, data);
  73     if (last_state == STATE_DOWN)
  74     {
  75         return btn;
  76     }
  77     else
  78     {
  79         *data = last_x = last_y = 0;
  80         return 0;
  81     }
  82 }