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};
/* Keep the example's window size in sync with the background image's size */
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)
{
printf("An object got focused: %s\n",
evas_object_name_get(event_info));
printf("Let's recheck it: %s\n",
evas_object_name_get(evas_focus_get(e)));
printf("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)
{
printf("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)
{
printf("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)
{
printf("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)
{
printf("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;
printf("We've got key input: %s\n", ev->key);
printf("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)
{
printf("Stopping animation timer\n");
ecore_timer_del(d.resize_timer);
d.resize_timer = NULL;
}
else
{
printf("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");
printf("Switching to %s for key input\n",
d.focus ? "key grabs" : "focus");
if (d.focus)
{
evas_object_focus_set(d.bg, EINA_FALSE);
printf("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)
{
printf("Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "c", 0, 0, EINA_TRUE);
if (!ret)
{
printf("Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "d", 0, 0, EINA_TRUE);
if (!ret)
{
printf("Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "f", 0, 0, EINA_TRUE);
if (!ret)
{
printf("Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "p", 0, 0, EINA_TRUE);
if (!ret)
{
printf("Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "o", mask, 0, EINA_TRUE);
if (!ret)
{
printf("Something went wrong with key grabs.\n");
goto c_end;
}
ret = evas_object_key_grab(d.bg, "h", 0, 0, EINA_TRUE);
if (!ret)
{
printf("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 */
{
printf("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 */
{
printf("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);
printf("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 */
{
printf("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)
{
printf("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, "error: Requires at least one Evas engine built and linked"
" to ecore-evas for this example to run properly.\n");
panic:
ecore_evas_shutdown();
return -1;
}
Ecore_Evas.h
Evas wrapper functions.
EVAS_ALLOC_ERROR_NONE
@ EVAS_ALLOC_ERROR_NONE
No allocation error.
Definition: Evas_Common.h:270
EVAS_CALLBACK_KEY_DOWN
@ EVAS_CALLBACK_KEY_DOWN
Key Press Event.
Definition: Evas_Common.h:430
EVAS_CALLBACK_MOUSE_IN
@ EVAS_CALLBACK_MOUSE_IN
Mouse In Event.
Definition: Evas_Common.h:420
EVAS_CALLBACK_RENDER_FLUSH_PRE
@ EVAS_CALLBACK_RENDER_FLUSH_PRE
Called after render update regions have been calculated, but only if update regions exist.
Definition: Evas_Common.h:445
EVAS_CALLBACK_CANVAS_OBJECT_FOCUS_IN
@ EVAS_CALLBACK_CANVAS_OBJECT_FOCUS_IN
Canvas object got focus.
Definition: Evas_Common.h:450
EVAS_CALLBACK_MOUSE_OUT
@ EVAS_CALLBACK_MOUSE_OUT
Mouse Out Event.
Definition: Evas_Common.h:421
ecore_evas_init
EAPI int ecore_evas_init(void)
Inits the Ecore_Evas system.
Definition: ecore_evas.c:602
ecore_evas_show
EAPI void ecore_evas_show(Ecore_Evas *ee)
Shows an Ecore_Evas' window.
Definition: ecore_evas.c:1480
ecore_evas_get
EAPI Evas * ecore_evas_get(const Ecore_Evas *ee)
Gets an Ecore_Evas's Evas.
Definition: ecore_evas.c:1300
ecore_evas_geometry_get
EAPI void ecore_evas_geometry_get(const Ecore_Evas *ee, int *x, int *y, int *w, int *h)
Gets the geometry of an Ecore_Evas.
Definition: ecore_evas.c:1362
ecore_evas_new
EAPI Ecore_Evas * ecore_evas_new(const char *engine_name, int x, int y, int w, int h, const char *extra_options)
Creates a new Ecore_Evas based on engine name and common parameters.
Definition: ecore_evas.c:1039
ecore_evas_callback_resize_set
EAPI void ecore_evas_callback_resize_set(Ecore_Evas *ee, Ecore_Evas_Event_Cb func)
Sets a callback for Ecore_Evas resize events.
Definition: ecore_evas.c:1140
ecore_evas_shutdown
EAPI int ecore_evas_shutdown(void)
Shuts down the Ecore_Evas system.
Definition: ecore_evas.c:666
ecore_evas_free
EAPI void ecore_evas_free(Ecore_Evas *ee)
Frees an Ecore_Evas.
Definition: ecore_evas.c:1083
ecore_main_loop_begin
void ecore_main_loop_begin(void)
Runs the application main loop.
Definition: ecore_main.c:1311
ecore_timer_del
void * ecore_timer_del(Ecore_Timer *timer)
Deletes the specified timer from the timer list.
Definition: ecore_timer.c:238
ecore_timer_add
Ecore_Timer * ecore_timer_add(double in, Ecore_Task_Cb func, const void *data)
Creates a timer to call the given function in the given period of time.
Definition: ecore_timer.c:189
Ecore_Timer
Eo Ecore_Timer
A handle for timers.
Definition: Ecore_Common.h:3079
EINA_LIST_FOREACH
#define EINA_LIST_FOREACH(list, l, _data)
Definition for the macro to iterate over a list.
Definition: eina_list.h:1415
EINA_TRUE
#define EINA_TRUE
boolean value TRUE (numerical value 1)
Definition: eina_types.h:539
EINA_FALSE
#define EINA_FALSE
boolean value FALSE (numerical value 0)
Definition: eina_types.h:533
Eina_Bool
unsigned char Eina_Bool
Type to mimic a boolean.
Definition: eina_types.h:527
EINA_UNUSED
#define EINA_UNUSED
Used to indicate that a function parameter is purposely unused.
Definition: eina_types.h:339
evas_event_callback_add
EVAS_API void evas_event_callback_add(Evas *eo_e, Evas_Callback_Type type, Evas_Event_Cb func, const void *data)
Add (register) a callback function to a given canvas event.
Definition: evas_callbacks.c:573
evas_event_callback_del_full
EVAS_API void * evas_event_callback_del_full(Evas *eo_e, Evas_Callback_Type type, Evas_Event_Cb func, const void *data)
Delete (unregister) a callback function registered to a given canvas event.
Definition: evas_callbacks.c:678
evas_output_viewport_get
EVAS_API void evas_output_viewport_get(const Evas *eo_e, Evas_Coord *x, Evas_Coord *y, Evas_Coord *w, Evas_Coord *h)
Get the render engine's output viewport coordinates in canvas units.
Definition: evas_main.c:1441
evas_key_modifier_get
EVAS_API const Evas_Modifier * evas_key_modifier_get(const Evas *eo_e)
Returns a handle to the list of modifier keys registered in the canvas e.
Definition: evas_key.c:35
evas_render_updates
EVAS_API Eina_List * evas_render_updates(Evas_Canvas *obj)
Force immediate renderization of the given Evas canvas.
Definition: evas_canvas_eo.legacy.c:297
evas_render_updates_free
EVAS_API void evas_render_updates_free(Eina_List *updates)
Free the rectangles returned by evas_render_updates().
Definition: evas_render.c:4078
evas_obscured_clear
EVAS_API void evas_obscured_clear(Evas_Canvas *obj)
Remove all "obscured regions" from an Evas canvas.
Definition: evas_canvas_eo.legacy.c:351
Evas
Eo Evas
An opaque handle to an Evas canvas.
Definition: Evas_Common.h:163
evas_obscured_rectangle_add
EVAS_API void evas_obscured_rectangle_add(Evas_Canvas *obj, int x, int y, int w, int h)
Add an "obscured region" to an Evas canvas.
Definition: evas_canvas_eo.legacy.c:327
evas_key_modifier_mask_get
EVAS_API Evas_Modifier_Mask evas_key_modifier_mask_get(const Evas *eo_e, const char *keyname)
Creates a bit mask from the keyname modifier key.
Definition: evas_key.c:271
evas_focus_get
EVAS_API Efl_Canvas_Object * evas_focus_get(const Evas_Canvas *obj)
Retrieve the object focused by the default seat.
Definition: evas_canvas_eo.legacy.c:51
evas_damage_rectangle_add
EVAS_API void evas_damage_rectangle_add(Evas_Canvas *obj, int x, int y, int w, int h)
Add a damage rectangle.
Definition: evas_canvas_eo.legacy.c:267
evas_event_freeze
EVAS_API void evas_event_freeze(Evas *eo_e)
Freeze all input events processing.
Definition: evas_events.c:1540
EVAS_LOAD_ERROR_NONE
@ EVAS_LOAD_ERROR_NONE
No error on load.
Definition: Evas_Loader.h:141
Evas_Modifier_Mask
unsigned long long Evas_Modifier_Mask
A bitmask of modifier keys.
Definition: Evas_Legacy.h:132
evas_key_modifier_is_set
EVAS_API Eina_Bool evas_key_modifier_is_set(const Evas_Modifier *m, const char *keyname)
Checks the state of a given modifier of the default seat, at the time of the call.
Definition: evas_key.c:76
evas_alloc_error
EVAS_API Evas_Alloc_Error evas_alloc_error(void)
Get the error status of the most recent memory allocation call.
Definition: main.c:17
evas_object_show
EVAS_API void evas_object_show(Evas_Object *eo_obj)
Makes the given Evas object visible.
Definition: evas_object_main.c:1814
evas_object_name_get
EVAS_API const char * evas_object_name_get(const Evas_Object *eo_obj)
Retrieves the name of the given Evas object.
Definition: evas_name.c:26
evas_object_name_set
EVAS_API void evas_object_name_set(Evas_Object *eo_obj, const char *name)
Sets the name of the given Evas object to the given name.
Definition: evas_name.c:5
evas_object_geometry_get
EVAS_API void evas_object_geometry_get(const Evas_Object *eo_obj, Evas_Coord *x, Evas_Coord *y, Evas_Coord *w, Evas_Coord *h)
Retrieves the position and (rectangular) size of the given Evas object.
Definition: evas_object_main.c:1335
evas_object_color_set
EVAS_API void evas_object_color_set(Evas_Object *obj, int r, int g, int b, int a)
Sets the general/main color of the given Evas object to the given one.
Definition: evas_object_main.c:2024
evas_object_event_callback_add
EVAS_API void evas_object_event_callback_add(Evas_Object *eo_obj, Evas_Callback_Type type, Evas_Object_Event_Cb func, const void *data)
Add (register) a callback function to a given Evas object event.
Definition: evas_callbacks.c:478
evas_object_move
EVAS_API void evas_object_move(Evas_Object *obj, Evas_Coord x, Evas_Coord y)
Move the given Evas object to the given location inside its canvas' viewport.
Definition: evas_object_main.c:1171
evas_object_precise_is_inside_get
EVAS_API Eina_Bool evas_object_precise_is_inside_get(const Efl_Canvas_Object *obj)
Determine whether an object is set to use precise point collision detection.
Definition: efl_canvas_object_eo.legacy.c:57
evas_object_precise_is_inside_set
EVAS_API void evas_object_precise_is_inside_set(Efl_Canvas_Object *obj, Eina_Bool precise)
Set whether to use precise (usually expensive) point collision detection for a given Evas object.
Definition: efl_canvas_object_eo.legacy.c:51
evas_object_focus_get
EVAS_API Eina_Bool evas_object_focus_get(const Efl_Canvas_Object *obj)
Indicates that this object is the keyboard event receiver on its canvas.
Definition: efl_canvas_object_eo.legacy.c:45
Evas_Object
Efl_Canvas_Object Evas_Object
An Evas Object handle.
Definition: Evas_Common.h:185
evas_object_focus_set
EVAS_API void evas_object_focus_set(Efl_Canvas_Object *obj, Eina_Bool focus)
Indicates that this object is the keyboard event receiver on its canvas.
Definition: efl_canvas_object_eo.legacy.c:39
evas_object_resize
EVAS_API void evas_object_resize(Evas_Object *obj, Evas_Coord w, Evas_Coord h)
Changes the size of the given Evas object.
Definition: evas_object_main.c:1236
evas_object_image_load_error_get
EVAS_API Evas_Load_Error evas_object_image_load_error_get(const Evas_Object *obj)
Retrieves a number representing any error that occurred during the last loading of the given image ob...
Definition: evas_image_legacy.c:400
evas_object_image_file_set
EVAS_API void evas_object_image_file_set(Evas_Object *obj, const char *file, const char *key)
Set the source file from where an image object must fetch the real image data (it may be an Eet file,...
Definition: evas_image_legacy.c:194
evas_object_image_filled_add
EVAS_API Evas_Object * evas_object_image_filled_add(Evas *eo_e)
Creates a new image object that automatically scales its bound image to the object's area,...
Definition: evas_image_legacy.c:35
evas_object_rectangle_add
EVAS_API Evas_Object * evas_object_rectangle_add(Evas *e)
Adds a rectangle to the given evas.
Definition: evas_object_rectangle.c:78
_Eina_List
Type for a generic double linked list.
Definition: eina_list.h:318
_Eina_Rectangle
Definition: eina_rectangle.h:109
_Eina_Rectangle::h
int h
height of rectangle
Definition: eina_rectangle.h:113
_Eina_Rectangle::x
int x
top-left x coordinate of rectangle
Definition: eina_rectangle.h:110
_Eina_Rectangle::y
int y
top-left y coordinate of rectangle
Definition: eina_rectangle.h:111
_Eina_Rectangle::w
int w
width of rectangle
Definition: eina_rectangle.h:112
_Evas_Event_Key_Down
Key press event.
Definition: Evas_Legacy.h:314
_Evas_Event_Key_Down::key
const char * key
The logical key : (eg shift+1 == exclamation)
Definition: Evas_Legacy.h:320