Flex & amp; FC 6, am I missing something - the code snippet

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  This is the code:

  /*
  * Copyright (c) 2011-2012 Research In Motion Limited.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  
  #include "input/screen_helpers.h"
  #include "gestures/double_tap.h"
  #include "gestures/pinch.h"
  #include "gestures/set.h"
  #include "gestures/swipe.h"
  #include "gestures/tap.h"
  #include "gestures/two_finger_pan.h"
  
  #define MIN_VIEWPORT_SIZE 128
  #define MAX_VIEWPORT_SIZE 4096
  screen_context_t screen_ctx;
  screen_window_t screen_win;
  static bool shutdown;
  struct gestures_set * set;
  const char* img_path = "app/native/wallpaper.jpg"; /* Relative path to image asset */
  int viewport_pos[2] = { 0, 0 };
  int viewport_size[2] = { 0, 0 };
  int last_touch[2] = { 0, 0 };
  
  /**
   * The callback invoked when a gesture is recognized or updated.
   */
  void
  gesture_callback(gesture_base_t* gesture, mtouch_event_t* event, void* param, int async)
  {
      if (async) {
          fprintf(stderr,"[async] ");
      }
      switch (gesture->type) {
          case GESTURE_TWO_FINGER_PAN: {
              gesture_tfpan_t* tfpan = (gesture_tfpan_t*)gesture;
              fprintf(stderr,"Two finger pan: %d, %d", (tfpan->last_centroid.x - tfpan->centroid.x), (tfpan->last_centroid.y - tfpan->centroid.y));
              if (tfpan->last_centroid.x && tfpan->last_centroid.y) {
                  viewport_pos[0] += (tfpan->last_centroid.x - tfpan->centroid.x) >> 1;
                  viewport_pos[1] += (tfpan->last_centroid.y - tfpan->centroid.y) >> 1;
              }
              break;
          }
          case GESTURE_PINCH: {
              gesture_pinch_t* pinch = (gesture_pinch_t*)gesture;
              fprintf(stderr,"Pinch %d, %d", (pinch->last_distance.x - pinch->distance.x), (pinch->last_distance.y - pinch->distance.y));
  
              int dist_x = pinch->distance.x;
              int dist_y = pinch->distance.y;
              int last_dist_x = pinch->last_distance.x;
              int last_dist_y = pinch->last_distance.y;
  
              int reldist = sqrt((dist_x)*(dist_x) + (dist_y)*(dist_y));
              int last_reldist = sqrt((last_dist_x)*(last_dist_x) + (last_dist_y)*(last_dist_y));
  
              if (reldist && last_reldist) {
                  viewport_size[0] += (last_reldist - reldist) >> 1;
                  viewport_size[1] += (last_reldist - reldist) >> 1;
  
                  /* Size restrictions */
                  if (viewport_size[0] < MIN_VIEWPORT_SIZE) {
                      viewport_size[0] = MIN_VIEWPORT_SIZE;
                  } else if (viewport_size[0] > MAX_VIEWPORT_SIZE) {
                      viewport_size[0] = MAX_VIEWPORT_SIZE;
                  }
                  if (viewport_size[1] < MIN_VIEWPORT_SIZE) {
                      viewport_size[1] = MIN_VIEWPORT_SIZE;
                  } else if (viewport_size[1] > MAX_VIEWPORT_SIZE) {
                      viewport_size[1] = MAX_VIEWPORT_SIZE;
                  }
  
                  /* Zoom into center of image */
                  if (viewport_size[0] > MIN_VIEWPORT_SIZE && viewport_size[1] > MIN_VIEWPORT_SIZE &&
                          viewport_size[0] < MAX_VIEWPORT_SIZE && viewport_size[1] < MAX_VIEWPORT_SIZE) {
                      viewport_pos[0] -= (last_reldist - reldist) >> 2;
                      viewport_pos[1] -= (last_reldist - reldist) >> 2;
                  }
              }
              break;
          }
          case GESTURE_TAP: {
              gesture_tap_t* tap = (gesture_tap_t*)gesture;
              fprintf(stderr,"Tap x:%d y:%d delay 2000",tap->touch_coords.x,tap->touch_coords.y);
              // *** 2 sec delay to reproduce issue ***
              delay(2000);
              break;
          }
          case GESTURE_DOUBLE_TAP: {
              gesture_tap_t* d_tap = (gesture_tap_t*)gesture;
              fprintf(stderr,"Double tap x:%d y:%d", d_tap->touch_coords.x, d_tap->touch_coords.y);
              break;
          }
          default: {
              fprintf(stderr,"Unknown Gesture");
              break;
          }
      }
      fprintf(stderr,"\n");
  }
  
  /**
   * Initialize the gestures sets
   */
  static void
  init_gestures()
  {
      gesture_tap_t* tap;
      gesture_double_tap_t* double_tap;
      set = gestures_set_alloc();
      if (NULL != set) {
          tap = tap_gesture_alloc(NULL, gesture_callback, set);
          double_tap = double_tap_gesture_alloc(NULL, gesture_callback, set);
          tfpan_gesture_alloc(NULL, gesture_callback, set);
          pinch_gesture_alloc(NULL, gesture_callback, set);
      } else {
          fprintf(stderr, "Failed to allocate gestures set\n");
      }
  }
  
  static void
  gestures_cleanup()
  {
      if (NULL != set) {
          gestures_set_free(set);
          set = NULL;
      }
  }
  
  static void
  handle_screen_event(bps_event_t *event)
  {
      int screen_val, rc;
  
      screen_event_t screen_event = screen_event_get_event(event);
      mtouch_event_t mtouch_event;
      rc = screen_get_event_property_iv(screen_event, SCREEN_PROPERTY_TYPE, &screen_val);
      if(screen_val == SCREEN_EVENT_MTOUCH_TOUCH || screen_val == SCREEN_EVENT_MTOUCH_MOVE || screen_val == SCREEN_EVENT_MTOUCH_RELEASE) {
          rc = screen_get_mtouch_event(screen_event, &mtouch_event, 0);
          if (rc) {
              fprintf(stderr, "Error: failed to get mtouch event\n");
          }
          rc = gestures_set_process_event(set, &mtouch_event, NULL);
  
          /* No gesture detected, treat as pan. */
          if (!rc) {
              if (mtouch_event.contact_id == 0) {
                  if(last_touch[0] && last_touch[1]) {
                      fprintf(stderr,"Pan %d %d\n",(last_touch[0] - mtouch_event.x),(last_touch[1] - mtouch_event.y));
                      viewport_pos[0] += (last_touch[0] - mtouch_event.x) >> 1;
                      viewport_pos[1] += (last_touch[1] - mtouch_event.y) >> 1;
                  }
                  last_touch[0] = mtouch_event.x;
                  last_touch[1] = mtouch_event.y;
              }
          }
          if (screen_val == SCREEN_EVENT_MTOUCH_RELEASE) {
              last_touch[0] = 0;
              last_touch[1] = 0;
          }
      }
  }
  
  static void
  handle_navigator_event(bps_event_t *event) {
      switch (bps_event_get_code(event)) {
      case NAVIGATOR_EXIT:
          shutdown = true;
          break;
      }
  }
  
  static void
  handle_events()
  {
      int rc, domain;
      bool has_events = true;
  
      while(has_events) {
          bps_event_t *event = NULL;
          rc = bps_get_event(&event, 50);
          assert(rc == BPS_SUCCESS);
          if (event) {
              domain = bps_event_get_domain(event);
              if (domain == navigator_get_domain()) {
                  handle_navigator_event(event);
              } else if (domain == screen_get_domain()) {
                  handle_screen_event(event);
                  /* Re-draw the screen after a screen event */
                  screen_set_window_property_iv(screen_win, SCREEN_PROPERTY_SOURCE_POSITION , viewport_pos);
                  screen_set_window_property_iv(screen_win, SCREEN_PROPERTY_SOURCE_SIZE , viewport_size);
                  screen_flush_context(screen_ctx,0);
              }
          } else {
              has_events = false;
          }
  
      }
  }
  
  static int decode_setup(uintptr_t data, img_t *img, unsigned flags)
  {
      screen_window_t screen_win = (screen_window_t)data;
      screen_buffer_t screen_buf;
      int size[2];
  
      size[0] = img->w;
      size[1] = img->h;
      screen_set_window_property_iv(screen_win, SCREEN_PROPERTY_BUFFER_SIZE, size);
      screen_create_window_buffers(screen_win, 1);
  
      screen_get_window_property_pv(screen_win, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)&screen_buf);
      screen_get_buffer_property_pv(screen_buf, SCREEN_PROPERTY_POINTER, (void **)&img->access.direct.data);
      screen_get_buffer_property_iv(screen_buf, SCREEN_PROPERTY_STRIDE, (int *)&img->access.direct.stride);
  
      img->flags |= IMG_DIRECT;
      return IMG_ERR_OK;
  }
  
  static void decode_abort(uintptr_t data, img_t *img)
  {
      screen_window_t screen_win = (screen_window_t)data;
      screen_destroy_window_buffers(screen_win);
  }
  
  int
  load_image(screen_window_t screen_win, const char *path)
  {
      img_decode_callouts_t callouts;
      img_lib_t ilib = NULL;
      img_t img;
      int rc;
  
      rc = img_lib_attach(&ilib);
      if (rc != IMG_ERR_OK) {
          return -1;
      }
  
      memset(&img, 0, sizeof(img));
      img.flags |= IMG_FORMAT;
      img.format = IMG_FMT_PKLE_XRGB8888;
  
      memset(&callouts, 0, sizeof(callouts));
      callouts.setup_f = decode_setup;
      callouts.abort_f = decode_abort;
      callouts.data = (uintptr_t)screen_win;
  
      rc = img_load_file(ilib, path, &callouts, &img);
      img_lib_detach(ilib);
  
      return rc == IMG_ERR_OK ? 0 : -1;
  }
  
  int
  main(int argc, char **argv)
  {
      const int usage = SCREEN_USAGE_WRITE;
  
      screen_buffer_t screen_buf = NULL;
      int rect[4] = { 0, 0, 0, 0 };
  
      /* Setup the window */
      screen_create_context(&screen_ctx, 0);
      screen_create_window(&screen_win, screen_ctx);
      screen_set_window_property_iv(screen_win, SCREEN_PROPERTY_USAGE, &usage);
  
      load_image(screen_win, img_path);
  
      screen_get_window_property_pv(screen_win, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)&screen_buf);
      screen_get_window_property_iv(screen_win, SCREEN_PROPERTY_BUFFER_SIZE, rect+2);
      viewport_size[0] = rect[2];
      viewport_size[1] = rect[3];
      screen_set_window_property_iv(screen_win, SCREEN_PROPERTY_SOURCE_SIZE , viewport_size);
  
      screen_post_window(screen_win, screen_buf, 1, rect, 0);
  
      init_gestures();
  
      /* Signal bps library that navigator and screen events will be requested */
      bps_initialize();
      screen_request_events(screen_ctx);
      navigator_request_events(0);
  
      while (!shutdown) {
          /* Handle user input */
          handle_events();
      }
  
      /* Clean up */
      gestures_cleanup();
      screen_stop_events(screen_ctx);
      bps_shutdown();
      screen_destroy_window(screen_win);
      screen_destroy_context(screen_ctx);
      return 0;
  }
  

  Yes, when I run the code above I get the same problem.  It seems that the two finger gestures and pinching are fly events and not 'fault', so that it goes to the tap gesture.  If I rearrange the gesture_allocs to this

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  _pinch = pinch_gesture_alloc (& pinparams, cb, _gest_set);
  _double_tap = double_tap_gesture_alloc (& dtparams, cb, _gest_set);
  _tap = tap_gesture_alloc (& tparams, cb, _gest_set);

  This works.  But the double tap does not work, probably because it takes 2 pressures, and to know that you have only 1 tap must wait or get an idle screen event.  In this case, I guess you could buffer events and use gestures_set_process_event_list with the functions in event_list.h

  https://developer.BlackBerry.com/native/reference/BB10/com.QNX.doc.gestures.lib_ref/topic/about_even...

  In addition, time of the event is the time of the real event, not when you have received the event with bps_get_event.  Any delay should not affect the treatment of the gesture.

• ORA-06530: Reference to the error message composite non initialized? Have I missed something

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  Thank you

  
  Brent S

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  Maybe a quick edit of the video he will make it clear if I'm right.

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  Brent S

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