ALLEGRO_EVENT_DISPLAY_SWITCH

ALLEGRO_EVENT_DISPLAY_SWITCH_OUT

William Labbett

Member #4,486

March 2004

Hi again,

I've been concentating on one particular bug in my program.
I studied ex_native_dialog quite hard and used some code from it to make a dialog for opening files.
The console output for this code is

Calling pGUIModes[current_mode](GetMenuID(current_mode), IOVariables, GUIData) with current_mode equal to 7
current_mode = 7
GetMenuID(current_mode) = -1
In load image. IO->queue is not NULL.
In load image. About to go into while loop.
Waiting for event.
Got event.
event type was mouse event.
Waiting for event.
Got event.
event type is 46
ASYNC_DIALOG_EVENT1 is 1699628593
Waiting for event.

C:\code_projects\art_program_2_debug>

event type 46 is ALLEGRO_EVENT_DISPLAY_SWITCH_OUT.
After the last 'waiting for event', the program quits and I get the command prompt again. Any ideas what could be causing an ALLEGRO_EVENT_DISPLAY_SWITCH_OUT to be triggered? I don't know Allegro 5 well enough to know how to fix the problem. Need some help please :-* .

#SelectExpand
   1#ifndef FILE_CHOOSER_CPP_INCLUDED
   2#define FILE_CHOOSER_CPP_INCLUDED
   3
   4#include <allegro5/allegro.h>
   5#include <allegro5/allegro_native_dialog.h>
   6#include <allegro5/allegro_font.h> //needed by input_output.hpp
   7
   8
   9#include "graphics_functions.hpp"
  10#include "miscellaneous.hpp"
  11#include <iostream>
  12#include <fstream>
  13#include <vector>
  14#include "font_manager.hpp"
  15#include "GUI_bitmaps.hpp"
  16#include "data_class.hpp"
  17
  18#include <sstream>
  19
  20#include "input_output.hpp"
  21
  22#include <allegro5/allegro_primitives.h>
  23
  24#include "up_and_down.hpp"
  25#include "files_list_box.hpp"
  26#include "modes_and_menu_ids.hpp"
  27
  28
  29#include "file_loader.hpp"
  30
  31
  32
  33/* To communicate from a separate thread, we need a user event. */
  34#define ASYNC_DIALOG_EVENT1   ALLEGRO_GET_EVENT_TYPE('e', 'N', 'F', '1')
  35
  36
  37
  38
  39typedef struct
  40{
  41   ALLEGRO_DISPLAY *display;
  42   ALLEGRO_FILECHOOSER *file_dialog;
  43   ALLEGRO_EVENT_SOURCE event_source;
  44   ALLEGRO_THREAD *thread;
  45} AsyncDialog;
  46
  47
  48/* async_file_dialog_thread_func() : Our thread to show the native file dialog. */
  49static void *async_file_dialog_thread_func(ALLEGRO_THREAD *thread, void *arg)
  50{
  51   AsyncDialog *data = (AsyncDialog *) arg;
  52   ALLEGRO_EVENT event;
  53   (void)thread;
  54
  55   al_show_native_file_dialog(data->display, data->file_dialog);
  56
  57   event.user.type = ASYNC_DIALOG_EVENT1;
  58   al_emit_user_event(&data->event_source, &event, NULL);
  59
  60   return NULL;
  61}
  62
  63
  64/* spawn_async_file_dialog() : opens up a dialog for choosing a file. */
  65static AsyncDialog *spawn_async_file_dialog(ALLEGRO_DISPLAY *display, const char *initial_path)
  66{
  67   AsyncDialog *data = (AsyncDialog *) malloc(sizeof *data);
  68
  69   data->file_dialog = al_create_native_file_dialog(initial_path, "Choose Black and White Image.", NULL, ALLEGRO_FILECHOOSER_PICTURES);
  70   al_init_user_event_source(&data->event_source);
  71   data->display = display;
  72   data->thread = al_create_thread(async_file_dialog_thread_func, data);
  73
  74   al_start_thread(data->thread);
  75
  76   return data;
  77}
  78
  79
  80
  81
  82
  83
  84/* stop_async_dialog() : ends the dialog for choosing a file. */
  85static void stop_async_dialog(AsyncDialog *data)
  86{
  87   if (data) {
  88      al_destroy_thread(data->thread);
  89      al_destroy_user_event_source(&data->event_source);
  90      if (data->file_dialog)
  91         al_destroy_native_file_dialog(data->file_dialog);
  92      free(data);
  93   }
  94}
  95
  96
  97
  98
  99/* load_image() : gui mode for loading an image from harddrive. */
 100int load_image(int mode_id, InputOutput *IO, DataClass& data)
 101{
 102   ALLEGRO_EVENT event;
 103   AsyncDialog *cur_dialog = NULL;
 104   const char *last_path = NULL;
 105
 106   //al_destroy_display(IO->display);
 107   //cout << "In load image." << endl;
 108   //system("PAUSE");
 109   //return -1;
 110
 111   
 112   if(IO->queue == NULL)
 113   {
 114     al_destroy_display(IO->display);
 115       cout << "In load image. IO->queue is NULL." << endl;
 116       system("PAUSE");
 117     return -1;  
 118   }
 119   else
 120   {
 121     cout << "In load image. IO->queue is not NULL." << endl;
 122   }
 123   
 124   al_flush_event_queue(IO->queue);
 125
 126   //al_clear_to_color(al_map_rgb(60, 60, 200));
 127   if(data.static_menu_background == NULL)
 128   {
 129     al_destroy_display(IO->display);
 130       cout << "In load image. data.static_menu_background is NULL." << endl;
 131       system("PAUSE");
 132     return -1;
 133   }
 134   al_draw_bitmap(data.static_menu_background, 0, 0, 0);
 135
 136
 137   al_flip_display();
 138   
 139
 140   cur_dialog = spawn_async_file_dialog(IO->display, last_path);
 141   al_register_event_source(IO->queue, &cur_dialog->event_source);
 142
 143   //al_destroy_display(IO->display);
 144   cout << "In load image. About to go into while loop." << endl;
 145   //system("PAUSE");
 146   //return -1;
 147
 148   
 149
 150
 151   while(1)
 152   {
 153    cout << "Waiting for event." << endl;
 154    
 155    if(IO->queue == NULL)
 156    {
 157     al_destroy_display(IO->display);
 158         cout << "IO->queue is NULL." << endl;
 159         system("PAUSE");
 160       return -1;  
 161    }
 162      al_wait_for_event(IO->queue, &event);
 163      
 164      cout << "Got event." << endl;
 165      if(event.type == 30)
 166    {
 167      cout << "event type was timer event.\n";  
 168    }
 169    else if(event.type >= 10 && event.type <= 25)
 170    {
 171      cout << "event type was mouse event.\n";  
 172      
 173    }
 174    else if(event.type == 12)
 175    {
 176      cout << "event type is key up." << endl;  
 177    }
 178    else
 179    {
 180      cout << "event type is " << event.type  << endl;
 181          cout << "ASYNC_DIALOG_EVENT1 is " << ASYNC_DIALOG_EVENT1 << endl; 
 182      
 183    }
 184
 185      if(event.type == ASYNC_DIALOG_EVENT1) /* dialogue was closed */
 186      {
 187         al_unregister_event_source(IO->queue, &cur_dialog->event_source);
 188
 189         /* If a file was chosen, put the path to it in the FilesListBox class of the DataClass data. */
 190
 191         if(al_get_native_file_dialog_count(cur_dialog->file_dialog) == 1)
 192         {
 193            int index = ((FilesListBox *) data.vp)->index_for_next_filename;
 194
 195
 196
 197            ((FilesListBox *) data.vp)->file_paths[index] = al_create_path(al_get_native_file_dialog_path(cur_dialog->file_dialog, 0));
 198
 199            ((FilesListBox *) data.vp)->file_names[index] = al_get_path_filename(((FilesListBox *) data.vp)->file_paths[index]);
 200
 201            /* Load the file. */
 202            if((((FilesListBox *) data.vp)->bitmaps[index] = al_load_bitmap( al_path_cstr(((FilesListBox *) data.vp)->file_paths[index], ALLEGRO_NATIVE_PATH_SEP) )) == NULL)
 203            {
 204                /* Set error_data.mode_number to LOAD_IMAGE_MODE so that after error
 205                has been reported, user can load another file. */
 206                //data.error_data.mode_number = LOAD_IMAGE_MODE;
 207                //data.error_data.mode_number = FILE_LOADING_PROBLEM;
 208                //return ERROR_LOG_MODE;
 209                al_destroy_display(IO->display);
 210                printf("load_image_mode() : Couldn't load file %s.\n", ((FilesListBox *) data.vp)->file_names[index]);
 211                printf("filename was : %s", ((FilesListBox *) data.vp)->file_names[index]);
 212                //printf("current working directory = %s", );
 213                system("PAUSE");
 214                exit(1);
 215            }
 216
 217
 218      
 219            if(((FilesListBox *) data.vp)->index_for_next_filename < ((FilesListBox *) data.vp)->max_files() - 1)
 220            {
 221               ++((FilesListBox *) data.vp)->index_for_next_filename;
 222               ++((FilesListBox *) data.vp)->num_files_in_files_list_box;
 223               break;
 224            }
 225         
 226         }
 227         else
 228         {
 229       cout << "0 or more than 1 file selected.\n";
 230       
 231             if(data.file_loader_calling_mode == MAIN_MENU_MODE)
 232             {
 233         if(cur_dialog != NULL)
 234           {
 235                    stop_async_dialog(cur_dialog);
 236                 }
 237         else
 238           {
 239          al_destroy_display(IO->display);
 240                    cout << "load_image : 0 or more than 1 file selected. cur_dialog is NULL.\n";
 241                    system("PAUSE");
 242                    exit(1); 
 243         }
 244         return MAIN_MENU_MODE;
 245             }
 246         }
 247
 248         stop_async_dialog(cur_dialog);
 249         break;
 250      }
 251
 252   }
 253
 254   if(data.file_loader_calling_mode == MAIN_MENU_MODE)
 255   {
 256      return AFTER_FILE_LOAD_MENU_MODE;
 257   }
 258   else if(data.file_loader_calling_mode == LOAD_FILES_PROMPT_MODE)
 259   {
 260      if(((FilesListBox *) data.vp)->num_files_in_files_list_box < data.num_files_needed)
 261      {
 262         return LOAD_FILES_PROMPT_MODE;
 263      }
 264      else
 265      {
 266         data.select_files = true;
 267         return data.mode_after_selector;
 268      }
 269      //data.select_files = true;
 270      //data.user_info_strings = Menu.GetButtonUserInfoStrings();
 271
 272   }
 273   else
 274   {
 275     
 276     cout << "Returning -1 from load_image." << endl;
 277      return -1;
 278   }
 279}
 280
 281
 282
 283
 284
 285#endif // FILE_CHOOSER_CPP_INCLUDED

Edgar Reynaldo

Major Reynaldo

May 2007

Any time the display loses focus, a SWITCH_OUT event is generated. When it receives focus again, it will receive a SWITCH_IN event.

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