evas-events.c

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evas-events.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define PACKAGE_EXAMPLES_DIR "."
#endif
#include <Ecore.h>
#include <Ecore_Evas.h>
#include <stdio.h>
#include <errno.h>
#include "evas-common.h"
#define WIDTH (320)
#define HEIGHT (240)
static const char *img_path = PACKAGE_EXAMPLES_DIR EVAS_IMAGE_FOLDER "/enlightenment.png";
static const char *commands = \
"commands are:\n"
"\ta - toggle animation timer\n"
"\tc - cycle between focus and key grabs for key input\n"
"\td - delete canvas callbacks\n"
"\tf - freeze input for 3 seconds\n"
"\tp - toggle precise point collision detection on image\n"
"\tControl + o - add an obscured rectangle\n"
"\th - print help\n";
struct test_data
{
Ecore_Evas *ee;
Evas *canvas;
Evas_Object *img, *bg;
Ecore_Timer *resize_timer, *freeze_timer;
Eina_Bool obscured, focus;
};
static struct test_data d = {0};
/* here to keep our example's window size and background image's
* size in synchrony */
static void
_canvas_resize_cb(Ecore_Evas *ee)
{
int w, h;
ecore_evas_geometry_get(ee, NULL, NULL, &w, &h);
evas_object_resize(d.bg, w, h);
}
/* called when our rectangle gets focus */
static void
_object_focus_in_cb(void *data EINA_UNUSED,
Evas *e,
void *event_info)
{
fprintf(stdout, "An object got focused: %s\n",
evas_object_name_get(event_info));
fprintf(stdout, "Let's recheck it: %s\n",
evas_object_name_get(evas_focus_get(e)));
fprintf(stdout, "And again: %s\n", evas_object_focus_get(event_info) ?
"OK!" : "Oops, something is bad.");
}
/* render flush callback */
static void
_render_flush_cb(void *data EINA_UNUSED,
Evas *e EINA_UNUSED,
void *event_info EINA_UNUSED)
{
fprintf(stdout, "Canvas is about to flush its rendering pipeline!\n");
}
/* put some action in the canvas */
static Eina_Bool
_resize_cb(void *data EINA_UNUSED)
{
int w, h, cw, ch;
evas_object_geometry_get(d.img, NULL, NULL, &w, &h);
ecore_evas_geometry_get(d.ee, NULL, NULL, &cw, &ch);
if (w < cw)
evas_object_resize(d.img, cw, ch);
else
evas_object_resize(d.img, cw / 2, ch / 2);
return EINA_TRUE; /* re-issue the timer */
}
/* let's have our events back */
static Eina_Bool
_thaw_cb(void *data EINA_UNUSED)
{
fprintf(stdout, "Canvas was frozen %d times, now thawing.\n",
evas_event_freeze_get(d.canvas));
evas_event_thaw(d.canvas);
return EINA_FALSE; /* do not re-issue the timer */
}
/* mouse enters the object's area */
static void
_on_mouse_in(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o EINA_UNUSED,
void *einfo EINA_UNUSED)
{
fprintf(stdout, "Enlightenment logo has had the mouse in.\n");
}
static void
_on_mouse_out(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o EINA_UNUSED,
void *einfo EINA_UNUSED)
{
fprintf(stdout, "Enlightenment logo has had the mouse out.\n");
} /* mouse exits the object's area */
/* examine the keys pressed */
static void
_on_keydown(void *data EINA_UNUSED,
Evas *evas,
Evas_Object *o EINA_UNUSED,
void *einfo)
{
const Evas_Modifier *mods;
Evas_Event_Key_Down *ev = einfo;
fprintf(stdout, "We've got key input: %s\n", ev->key);
fprintf(stdout, "It actually came from %s\n", d.focus ?
"focus" : "key grab");
if (strcmp(ev->key, "h") == 0) /* print help */
{
puts(commands);
return;
}
if (strcmp(ev->key, "a") == 0) /* toggle animation timer */
{
if (d.resize_timer != NULL)
{
fprintf(stdout, "Stopping animation timer\n");
ecore_timer_del(d.resize_timer);
d.resize_timer = NULL;
}
else
{
fprintf(stdout, "Re-issuing animation timer\n");
d.resize_timer = ecore_timer_add(2, _resize_cb, NULL);
}
return;
}
if (strcmp(ev->key, "c") == 0) /* cycle between focus and key
* grabs for key input */
{
Eina_Bool ret;
Evas_Modifier_Mask mask =
evas_key_modifier_mask_get(d.canvas, "Control");
fprintf(stdout, "Switching to %s for key input\n", d.focus ?
"key grabs" : "focus");
if (d.focus)
{
evas_object_focus_set(d.bg, EINA_FALSE);
fprintf(stdout, "Focused object is now %s\n",
evas_focus_get(d.canvas) ?
"still valid! Something went wrong." : "none.");
ret = evas_object_key_grab(d.bg, "a", 0, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "c", 0, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "d", 0, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "f", 0, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "p", 0, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "o", mask, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "h", 0, 0, EINA_TRUE);
if (!ret)
{
fprintf(stdout, "Something went wrong with key grabs.\n");
goto c_end;
}
}
else /* got here by key grabs */
{
evas_object_key_ungrab(d.bg, "a", 0, 0);
evas_object_key_ungrab(d.bg, "c", 0, 0);
evas_object_key_ungrab(d.bg, "d", 0, 0);
evas_object_key_ungrab(d.bg, "f", 0, 0);
evas_object_key_ungrab(d.bg, "p", 0, 0);
evas_object_key_ungrab(d.bg, "o", mask, 0);
evas_object_key_ungrab(d.bg, "h", 0, 0);
evas_object_focus_set(d.bg, EINA_TRUE);
}
c_end:
d.focus = !d.focus;
return;
}
if (strcmp(ev->key, "d") == 0) /* delete canvas' callbacks */
{
fprintf(stdout, "Deleting canvas event callbacks\n");
evas_event_callback_del_full(evas, EVAS_CALLBACK_RENDER_FLUSH_PRE,
_render_flush_cb, NULL);
evas_event_callback_del_full(
evas, EVAS_CALLBACK_CANVAS_OBJECT_FOCUS_IN,
_object_focus_in_cb, NULL);
return;
}
if (strcmp(ev->key, "f") == 0) /* freeze input for 3 seconds */
{
fprintf(stdout, "Freezing input for 3 seconds\n");
evas_event_freeze(evas);
d.freeze_timer = ecore_timer_add(3, _thaw_cb, NULL);
return;
}
if (strcmp(ev->key, "p") == 0) /* toggle precise point
* collision detection */
{
Eina_Bool precise = evas_object_precise_is_inside_get(d.img);
fprintf(stdout, "Toggling precise point collision detection %s on"
" Enlightenment logo\n", precise ? "off" : "on");
evas_object_precise_is_inside_set(d.img, !precise);
return;
}
mods = evas_key_modifier_get(evas);
if (evas_key_modifier_is_set(mods, "Control") &&
(strcmp(ev->key, "o") == 0)) /* add an obscured
* rectangle to the middle
* of the canvas */
{
fprintf(stdout, "Toggling obscured rectangle on canvas\n");
if (!d.obscured)
{
int w, h;
evas_output_viewport_get(evas, NULL, NULL, &w, &h);
evas_obscured_rectangle_add(evas, w / 4, h / 4, w / 2, h / 2);
}
else
{
int w, h;
Eina_Rectangle *rect;
Eina_List *updates, *l;
evas_output_viewport_get(evas, NULL, NULL, &w, &h);
evas_obscured_clear(evas);
/* we have to flag a damage region here because
* evas_obscured_clear() doesn't change the canvas'
* state. we'd have to wait for an animation step, for
* example, to get the result, without it */
evas_damage_rectangle_add(evas, 0, 0, w, h);
updates = evas_render_updates(evas);
EINA_LIST_FOREACH(updates, l, rect)
{
fprintf(stdout, "Rectangle (%d, %d, %d, %d) on canvas got a"
" rendering update.\n", rect->x, rect->y,
rect->w,
rect->h);
}
evas_render_updates_free(updates);
}
d.obscured = !d.obscured;
} /* end of obscured region command */
}
int
main(void)
{
int err;
if (!ecore_evas_init())
return EXIT_FAILURE;
/* this will give you a window with an Evas canvas under the first
* engine available */
d.ee = ecore_evas_new(NULL, 10, 10, WIDTH, HEIGHT, NULL);
if (!d.ee)
goto error;
ecore_evas_callback_resize_set(d.ee, _canvas_resize_cb);
ecore_evas_show(d.ee);
/* the canvas pointer, de facto */
d.canvas = ecore_evas_get(d.ee);
evas_event_callback_add(d.canvas, EVAS_CALLBACK_RENDER_FLUSH_PRE,
_render_flush_cb, NULL);
if (evas_alloc_error() != EVAS_ALLOC_ERROR_NONE)
{
fprintf(stderr, "ERROR: Callback registering failed! Aborting.\n");
goto panic;
}
evas_event_callback_add(d.canvas, EVAS_CALLBACK_CANVAS_OBJECT_FOCUS_IN,
_object_focus_in_cb, NULL);
if (evas_alloc_error() != EVAS_ALLOC_ERROR_NONE)
{
fprintf(stderr, "ERROR: Callback registering failed! Aborting.\n");
goto panic;
} /* two canvas event callbacks */
d.bg = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.bg, "our dear rectangle");
evas_object_color_set(d.bg, 255, 255, 255, 255); /* white bg */
evas_object_move(d.bg, 0, 0); /* at canvas' origin */
evas_object_resize(d.bg, WIDTH, HEIGHT); /* covers full canvas */
evas_object_show(d.bg);
evas_object_focus_set(d.bg, EINA_TRUE); /* so we get input events */
d.focus = EINA_TRUE;
evas_object_event_callback_add(
d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
if (evas_alloc_error() != EVAS_ALLOC_ERROR_NONE)
{
fprintf(stderr, "ERROR: Callback registering failed! Aborting.\n");
goto panic;
}
d.img = evas_object_image_filled_add(d.canvas);
evas_object_image_file_set(d.img, img_path, NULL);
err = evas_object_image_load_error_get(d.img);
if (err != EVAS_LOAD_ERROR_NONE)
{
fprintf(stderr, "ERROR: Image loading failed! Aborting.\n");
goto panic;
}
else
{
evas_object_move(d.img, 0, 0);
evas_object_resize(d.img, WIDTH, HEIGHT);
evas_object_show(d.img);
evas_object_event_callback_add(
d.img, EVAS_CALLBACK_MOUSE_IN, _on_mouse_in, NULL);
evas_object_event_callback_add(
d.img, EVAS_CALLBACK_MOUSE_OUT, _on_mouse_out, NULL);
}
d.resize_timer = ecore_timer_add(2, _resize_cb, NULL);
puts(commands);
ecore_main_loop_begin();
ecore_evas_free(d.ee);
ecore_evas_shutdown();
return 0;
error:
fprintf(stderr, "you got to have at least one evas engine built and linked"
" up to ecore-evas for this example to run properly.\n");
panic:
ecore_evas_shutdown();
return -1;
}