evas-stacking.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define PACKAGE_EXAMPLES_DIR "."
#endif
#include <Ecore.h>
#include <Ecore_Evas.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define WIDTH 320
#define HEIGHT 320
struct test_data
{
Ecore_Evas *ee;
Evas *canvas;
Evas_Object *bg;
Evas_Object *rects[3]; /* red, green, blue */
int layers[3]; /* default, below it, above it */
int cur_rect, cur_layer;
};
static struct test_data d = {0};
static const char *commands = \
"commands are:\n"
"\tc - change the target rectangle to operate on\n"
"\ta - stack target rectangle one level above\n"
"\tb - stack target rectangle one level below\n"
"\tt - stack target rectangle up to the top of its layer\n"
"\tm - stack target rectangle down to the bottom of its layer\n"
"\tp - toggle target rectangle's 'pass events' property\n"
"\tr - toggle target rectangle's 'repeat events' property\n"
"\ts - print current stacking information\n"
"\tl - change background rectangle's layer\n"
"\th - print help\n";
static const char *
_name_get(Evas_Object *o)
{
const char *s = evas_object_name_get(o);
if (!s) s = "(null)";
return s;
}
static void
_on_mouse_down(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o,
void *einfo EINA_UNUSED)
{
printf("Mouse down on rectangle %s!\n", _name_get(o));
}
/* 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);
}
/* use the following commands to interact with this example - 'h' is
* the key for help */
static void
_on_keydown(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o EINA_UNUSED,
void *einfo)
{
Evas_Event_Key_Down *ev = einfo;
const char *name = _name_get(d.rects[d.cur_rect]);
if (strcmp(ev->key, "h") == 0) /* print help */
{
printf("%s\n", commands);
return;
}
if (strcmp(ev->key, "s") == 0) /* get status of the
* rectangles WRT size
* hints */
{
Evas_Object *rect;
printf("Order of stacking, from top to bottom, is: ");
rect = evas_object_top_get(evas);
printf("%s", _name_get(rect));
rect = evas_object_below_get(rect);
while (rect)
{
printf(", %s", _name_get(rect));
rect = evas_object_below_get(rect);
}
printf(".\n");
printf("Current target rectangle is %s\n",
_name_get(d.rects[d.cur_rect]));
printf("Background rectangle's layer is %d\n",
evas_object_layer_get(d.bg));
return;
}
if (strcmp(ev->key, "l") == 0) /* change background rectangle's layer */
{
d.cur_layer = (d.cur_layer + 1) % 3;
evas_object_layer_set(d.bg, d.layers[d.cur_layer]);
printf("Changing background rectangle's layer to %d\n",
d.layers[d.cur_layer]);
return;
}
if (strcmp(ev->key, "c") == 0) /* change rectangle to operate on */
{
d.cur_rect = (d.cur_rect + 1) % 3;
printf("Changing target rectangle to the %s one\n",
_name_get(d.rects[d.cur_rect]));
return;
}
if (strcmp(ev->key, "t") == 0) /* bring target to top */
{
Evas_Object *neighbour;
evas_object_raise(d.rects[d.cur_rect]);
printf("%s rectangle was re-stacked to the top if its layer\n",
name);
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
printf("Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
if (strcmp(ev->key, "m") == 0) /* bring target to bottom */
{
Evas_Object *neighbour;
evas_object_lower(d.rects[d.cur_rect]);
printf("%s rectangle was re-stacked to the bottom if its layer\n",
name);
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
printf("Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
if (strcmp(ev->key, "p") == 0) /* toggle pass events */
{
Eina_Bool pass = evas_object_pass_events_get(d.rects[d.cur_rect]);
evas_object_pass_events_set(d.rects[d.cur_rect], !pass);
printf("%s rectangle is now set to%s pass (ignore) events\n",
name, pass ? " NOT" : "");
return;
}
if (strcmp(ev->key, "r") == 0) /* toggle repeat events */
{
Eina_Bool repeat = evas_object_repeat_events_get(d.rects[d.cur_rect]);
evas_object_repeat_events_set(d.rects[d.cur_rect], !repeat);
printf("%s rectangle is now set to%s repeat events\n",
name, repeat ? " NOT" : "");
return;
}
if (strcmp(ev->key, "a") == 0) /* stack target above */
{
Evas_Object *neighbour = evas_object_above_get(d.rects[d.cur_rect]);
if (!neighbour || (evas_object_layer_get(d.rects[d.cur_rect]) !=
evas_object_layer_get(neighbour)))
return;
evas_object_stack_above(d.rects[d.cur_rect], neighbour);
printf("%s rectangle was re-stacked one level above\n", name);
neighbour = evas_object_above_get(d.rects[d.cur_rect]);
printf("Above of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
printf("Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
if (strcmp(ev->key, "b") == 0) /* stack target below */
{
Evas_Object *neighbour = evas_object_below_get(d.rects[d.cur_rect]);
if (!neighbour || (evas_object_layer_get(d.rects[d.cur_rect]) !=
evas_object_layer_get(neighbour)))
return;
evas_object_stack_below(d.rects[d.cur_rect], neighbour);
printf("%s rectangle was re-stacked one level below\n", name);
neighbour = evas_object_above_get(d.rects[d.cur_rect]);
printf("Above of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
printf("Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
}
static void
_on_destroy(Ecore_Evas *ee EINA_UNUSED)
{
ecore_main_loop_quit();
}
int
main(void)
{
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, 0, 0, WIDTH, HEIGHT, NULL);
if (!d.ee)
goto error;
ecore_evas_callback_destroy_set(d.ee, _on_destroy);
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);
d.bg = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.bg, "background"); /* white bg */
evas_object_color_set(d.bg, 255, 255, 255, 255);
evas_object_move(d.bg, 0, 0);
evas_object_resize(d.bg, WIDTH, HEIGHT);
d.layers[0] = evas_object_layer_get(d.bg);
d.layers[1] = d.layers[0] - 1;
d.layers[2] = d.layers[0] + 1;
d.cur_layer = 1;
evas_object_layer_set(d.bg, d.layers[d.cur_layer]); /* let's start with it
* below the default
* layer */
evas_object_show(d.bg);
evas_object_focus_set(d.bg, EINA_TRUE);
evas_object_event_callback_add(
d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
d.rects[2] = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.rects[2], "blue");
evas_object_color_set(d.rects[2], 0, 0, 255, 255);
evas_object_resize(d.rects[2], WIDTH / 2.2, WIDTH / 2.2);
evas_object_move(d.rects[2], WIDTH / 6, WIDTH / 4.5);
evas_object_show(d.rects[2]);
evas_object_event_callback_add(
d.rects[2], EVAS_CALLBACK_MOUSE_DOWN, _on_mouse_down, NULL);
d.rects[1] = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.rects[1], "green");
evas_object_color_set(d.rects[1], 0, 255, 0, 255);
evas_object_resize(d.rects[1], WIDTH / 2.2, WIDTH / 2.2);
evas_object_move(d.rects[1], WIDTH / 2.5, WIDTH / 7);
evas_object_show(d.rects[1]);
evas_object_event_callback_add(
d.rects[1], EVAS_CALLBACK_MOUSE_DOWN, _on_mouse_down, NULL);
d.rects[0] = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.rects[0], "red");
evas_object_color_set(d.rects[0], 255, 0, 0, 255);
evas_object_resize(d.rects[0], WIDTH / 2.2, WIDTH / 2.2);
evas_object_move(d.rects[0], WIDTH / 3, WIDTH / 2.5);
evas_object_show(d.rects[0]);
evas_object_event_callback_add(
d.rects[0], EVAS_CALLBACK_MOUSE_DOWN, _on_mouse_down, NULL);
printf("%s\n", commands);
ecore_main_loop_begin();
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");
return -1;
}
Ecore_Evas.h
Evas wrapper functions.
EVAS_CALLBACK_KEY_DOWN
@ EVAS_CALLBACK_KEY_DOWN
Key Press Event.
Definition Evas_Common.h:430
EVAS_CALLBACK_MOUSE_DOWN
@ EVAS_CALLBACK_MOUSE_DOWN
Mouse Button Down Event.
Definition Evas_Common.h:422
ecore_evas_init
EAPI int ecore_evas_init(void)
Inits the Ecore_Evas system.
Definition ecore_evas.c:608
ecore_evas_callback_destroy_set
EAPI void ecore_evas_callback_destroy_set(Ecore_Evas *ee, Ecore_Evas_Event_Cb func)
Sets a callback for Ecore_Evas destroy events.
Definition ecore_evas.c:1199
ecore_evas_show
EAPI void ecore_evas_show(Ecore_Evas *ee)
Shows an Ecore_Evas' window.
Definition ecore_evas.c:1494
ecore_evas_get
EAPI Evas * ecore_evas_get(const Ecore_Evas *ee)
Gets an Ecore_Evas's Evas.
Definition ecore_evas.c:1314
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:1376
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:1053
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:1154
ecore_evas_shutdown
EAPI int ecore_evas_shutdown(void)
Shuts down the Ecore_Evas system.
Definition ecore_evas.c:672
ecore_main_loop_quit
void ecore_main_loop_quit(void)
Quits the main loop once all the events currently on the queue have been processed.
Definition ecore_main.c:1321
ecore_main_loop_begin
void ecore_main_loop_begin(void)
Runs the application main loop.
Definition ecore_main.c:1311
EINA_TRUE
#define EINA_TRUE
boolean value TRUE (numerical value 1)
Definition eina_types.h:539
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_Key_Down
struct _Evas_Event_Key_Down Evas_Event_Key_Down
Event structure for EVAS_CALLBACK_KEY_DOWN event callbacks.
Definition Evas_Legacy.h:154
evas_object_top_get
EVAS_API Efl_Canvas_Object * evas_object_top_get(const Evas_Canvas *obj)
Get the highest (stacked) Evas object on the canvas e.
Definition evas_canvas_eo.legacy.c:63
Evas
Eo Evas
An opaque handle to an Evas canvas.
Definition Evas_Common.h:163
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_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_pass_events_get
EVAS_API Eina_Bool evas_object_pass_events_get(const Efl_Canvas_Object *obj)
Determine whether an object is set to pass (ignore) events.
Definition efl_canvas_object_eo.legacy.c:82
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_raise
EVAS_API void evas_object_raise(Evas_Object *obj)
Raise obj to the top of its layer.
Definition evas_stack.x:38
evas_object_below_get
EVAS_API Evas_Object * evas_object_below_get(const Evas_Object *obj)
Get the Evas object stacked right below obj.
Definition evas_stack.x:352
evas_object_stack_below
EVAS_API void evas_object_stack_below(Evas_Object *obj, Evas_Object *below)
Stack obj immediately below below.
Definition evas_stack.x:231
evas_object_layer_set
EVAS_API void evas_object_layer_set(Evas_Object *obj, short l)
Sets the layer of its canvas that the given object will be part of.
Definition evas_layer.c:212
evas_object_above_get
EVAS_API Evas_Object * evas_object_above_get(const Evas_Object *obj)
Get the Evas object stacked right above obj.
Definition evas_stack.x:323
evas_object_pass_events_set
EVAS_API void evas_object_pass_events_set(Efl_Canvas_Object *obj, Eina_Bool pass)
Set whether an Evas object is to pass (ignore) events.
Definition efl_canvas_object_eo.legacy.c:76
evas_object_layer_get
EVAS_API short evas_object_layer_get(const Evas_Object *obj)
Retrieves the layer of its canvas that the given object is part of.
Definition evas_layer.c:269
evas_object_stack_above
EVAS_API void evas_object_stack_above(Evas_Object *obj, Evas_Object *above)
Stack obj immediately above above.
Definition evas_stack.x:137
evas_object_repeat_events_get
EVAS_API Eina_Bool evas_object_repeat_events_get(const Efl_Canvas_Object *obj)
Determine whether an object is set to repeat events.
Definition efl_canvas_object_eo.legacy.c:33
evas_object_lower
EVAS_API void evas_object_lower(Evas_Object *obj)
Lower obj to the bottom of its layer.
Definition evas_stack.x:87
evas_object_repeat_events_set
EVAS_API void evas_object_repeat_events_set(Efl_Canvas_Object *obj, Eina_Bool repeat)
Set whether an Evas object is to repeat events.
Definition efl_canvas_object_eo.legacy.c:27
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_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
_Evas_Event_Key_Down::key
const char * key
The logical key : (eg shift+1 == exclamation).
Definition Evas_Legacy.h:320