forked from enlightenment/efl
239 lines
5.5 KiB
C
239 lines
5.5 KiB
C
/**
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@file
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@brief Ecore Library Public API Calls
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These routines are used for Ecore Library interaction
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*/
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/**
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@mainpage Ecore
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@image latex ecore_big.eps width=5cm
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@image html ecore.png
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@version 1.0.0
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@author Carsten Haitzler <raster@rasterman.com>
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@date 2000-2003
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@section intro What is Ecore?
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Ecore is a clean and tiny event loop library with many modules to do lots of
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convenient things for a programmer, to save time and effort.
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It's small and lean, designed to work on embedded systems all the way to
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large and powerful multi-cpu workstations. It serialises all system signals,
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events etc. into a single event queue, that is easily processed without
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needing to worry about concurrency. A properly written, event-driven program
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using this kind of programming doesn't need threads, nor has to worry about
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concurrency. It turns a program into a state machine, and makes it very
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robust and easy to follow.
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Ecore gives you other handy primitives, such as timers to tick over for you
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and call specified functions at particular times so the programmer can use
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this to do things, like animate, or time out on connections or tasks that take
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too long etc.
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Idle handlers are provided too, as well as calls on entering an idle state
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(often a very good time to update the state of the program). All events that
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enter the system are passed to specific callback functions that the program
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sets up to handle those events. Handling them is simple and other Ecore
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modules produce more events on the queue, coming from other sources such as
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file descriptors etc.
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Ecore also lets you have functions called when file descriptors become active
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for reading or writing, allowing for streamlined, non-blocking IO.
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Here is an exmaple of a simple program and its basic event loop flow:
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@image html prog_flow.png
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@section work How does Ecore work?
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Ecore is very easy to learn and use. All the function calls are designed to
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be easy to remember, explicit in describing what they do, and heavily
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name-spaced. Ecore programs can start and be very simple.
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For example:
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@code
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#include <Ecore.h>
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int main(int argc, const char **argv)
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{
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ecore_init();
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ecore_app_args_set(argc, argv);
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ecore_main_loop_begin();
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ecore_shutdown();
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return 0;
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}
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@endcode
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This program is very simple and does't check for errors, but it does start up
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and begin a main loop waiting for events or timers to tick off. This program
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doesn't set up any, but now we can expand on this simple program a little
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more by adding some event handlers and timers.
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@code
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#include <Ecore.h>
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Ecore_Timer *timer1 = NULL;
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Ecore_Event_Handler *handler1 = NULL;
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double start_time = 0.0;
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int timer_func(void *data)
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{
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printf("Tick timer. Sec: %3.2f\n", ecore_time_get() - start_time);
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return 1;
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}
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int exit_func(int ev_type, void *ev, void *data)
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{
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Ecore_Event_Signal_Exit *e;
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e = (Ecore_Event_Signal_Exit *)ev;
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if (e->interrupt) printf("Exit: interrupt\n");
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else if (e->quit) printf("Exit: quit\n");
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else if (e->terminate) printf("Exit: terminate\n");
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ecore_main_loop_quit();
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return 1;
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}
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int main(int argc, const char **argv)
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{
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ecore_init();
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ecore_app_args_set(argc, argv);
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start_time = ecore_time_get();
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handler1 = ecore_event_handler_add(ECORE_EVENT_SIGNAL_EXIT, exit_func, NULL);
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timer1 = ecore_timer_add(0.5, timer_func, NULL);
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ecore_main_loop_begin();
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ecore_shutdown();
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return 0;
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}
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@endcode
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In the previous example, we initialize our application and get the time at which
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our program has started so we can calculate an offset. We set up a timer to
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tick off in 0.5 seconds, and since it returns 1, will keep ticking off every
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0.5 seconds until it returns 0, or is deleted by hand. An event handler is set
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up to call a function - exit_func(), whenever an event of type
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ECORE_EVENT_SIGNAL_EXIT is received (CTRL-C on the command line will cause
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such an event to happen). If this event occurs it tells you what kind of
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exit signal was received, and asks the main loop to quit when it is finished
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by calling ecore_main_loop_quit().
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The handles returned by ecore_timer_add() and ecore_event_handler_add() are
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only stored here as an example. If you don't need to address the timer or
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event handler again you don't need to store the result, so just call the
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function, and don't assign the result to any variable.
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This program looks slightly more complex than needed to do these simple
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things, but in principle, programs don't get any more complex. You add more
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event handlers, for more events, will have more timers and such, BUT it all
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follows the same principles as shown in this example.
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@section compiling How to compile using Ecore?
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This section has to be documented. Below is just a quick line to handle all
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Ecore modules at once.
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@verbatim
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gcc *.c \
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-I/usr/local/include -I/usr/X11R6/include \
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-L/usr/local/lib -L/usr/X11R6/lib \
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-lecore -lecore_evas -lecore_x -lecore_fb -lecore_job \
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`evas-config --cflags --libs`
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@endverbatim
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@section install How is it installed?
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Suggested configure options for evas for a Linux desktop X display:
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@verbatim
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./configure \
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--enable-ecore-x \
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--enable-ecore-fb \
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--enable-ecore-evas \
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--enable-ecore-evas-gl \
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--enable-ecore-job \
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--enable-ecore-con \
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--enable-ecore-ipc \
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--enable-ecore-txt
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make CFLAGS="-O9 -mpentiumpro -march=pentiumpro -mcpu=pentiumpro"
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@endverbatim
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@section tutorial Ecore Tutorial
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You will find a more comprehensive @ref tut here, going through many examples
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with tips and hints as to how best do some things.
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@todo (1.0) Document API
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*/
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/** @page tut Ecore Tutorial
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Here is a tutotial for using Ecore...
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*/
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