--- /dev/null
+/**
+ * Simple Evas example illustrating <b>alignment, minimum size, maximum
+ * size, padding and weight</b> hints on objects.
+ *
+ * To exemplify those hints, whe use the Evas box object, one of the
+ * managers using size hints to layout its children.
+ *
+ * You'll need at least one engine built for it (excluding the buffer
+ * one) and the png image loader also built. See stdout/stderr for
+ * output.
+ *
+ * @verbatim
+ * gcc -o evas-events evas-events.c `pkg-config --libs --cflags ecore-evas edje`
+ * @endverbatim
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <Ecore.h>
+#include <Ecore_Evas.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define WIDTH 320
+#define HEIGHT 480
+
+static const char *border_img_path = PACKAGE_EXAMPLES_DIR "/red.png";
+
+struct coord_tuple
+{
+ Evas_Coord w, h;
+};
+
+struct weight_tuple
+{
+ double x, y;
+};
+
+struct padding_tuple
+{
+ Evas_Coord l, r, t, b;
+};
+
+struct rect_data
+{
+ struct coord_tuple *min_ptr;
+ struct coord_tuple min[3];
+
+ struct coord_tuple *max_ptr;
+ struct coord_tuple max[3];
+
+ struct weight_tuple *align_ptr;
+ struct weight_tuple align[3];
+
+ struct weight_tuple *weight_ptr;
+ struct weight_tuple weight[3];
+
+ struct padding_tuple *padding_ptr;
+ struct padding_tuple padding[3];
+};
+
+struct test_data
+{
+ Ecore_Evas *ee;
+ Evas *canvas;
+ struct rect_data t_data, b_data;
+ Evas_Object *bg, *box, *t_rect, *b_rect, *border;
+};
+
+static struct test_data d = {0};
+
+/* here just 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);
+}
+
+static void
+_print_rect_stats(Evas_Object *rect)
+{
+ Evas_Coord w, h, l, r, t, b;
+ double x, y;
+
+ evas_object_size_hint_align_get(rect, &x, &y);
+ fprintf(stdout, "\talign hints: h(%f), v(%f)\n", x, y);
+
+ evas_object_size_hint_min_get(rect, &w, &h);
+ fprintf(stdout, "\tmin. size hints: h(%d), v(%d)\n", w, h);
+
+ evas_object_size_hint_max_get(rect, &w, &h);
+ fprintf(stdout, "\tmax. size hints: h(%d), v(%d)\n", w, h);
+
+ evas_object_size_hint_padding_get(rect, &l, &r, &t, &b);
+ fprintf(stdout, "\tpadding hints: l(%d), r(%d), t(%d), b(%d)\n",
+ l, r, t, b);
+
+ evas_object_size_hint_weight_get(rect, &x, &y);
+ fprintf(stdout, "\tweight hints: h(%f), v(%f)\n", x, y);
+}
+
+/* use the following commands to interact with this example - 'h' is
+ * the key for help */
+static void
+_on_keydown(void *data __UNUSED__,
+ Evas *evas __UNUSED__,
+ Evas_Object *o __UNUSED__,
+ void *einfo)
+{
+ Evas_Event_Key_Down *ev = einfo;
+ struct rect_data *r_data = NULL;
+ const Evas_Modifier *mods;
+ Evas_Object *rect = NULL;
+ const char *name = NULL;
+
+ mods = evas_key_modifier_get(evas);
+ if (evas_key_modifier_is_set(mods, "Shift"))
+ {
+ rect = d.t_rect;
+ r_data = &d.t_data;
+ name = "top";
+ }
+ else if (evas_key_modifier_is_set(mods, "Control"))
+ {
+ rect = d.b_rect;
+ r_data = &d.b_data;
+ name = "bottom";
+ }
+ else if (strcmp(ev->keyname, "h") == 0) /* print help */
+ {
+ fprintf(stdout,
+ "commands are:\n"
+ "\tShift + a - change alignment hints on top rectangle\n"
+ "\tShift + m - change min. size hint on top rectangle\n"
+ "\tShift + n - change max. size hint on top rectangle\n"
+ "\tShift + p - change padding hints on top rectangle\n"
+ "\tShift + w - change weight hints on top rectangle\n\n"
+ "\tControl + a - change alignment hints on bottom rectangle\n"
+ "\tControl + m - change min. size hint on bottom rectangle\n"
+ "\tControl + n - change max. size hint on bottom rectangle\n"
+ "\tControl + p - change padding hints on bottom rectangle\n"
+ "\tControl + w - change weight hints on bottom rectangle\n\n"
+ "\ts - print current hints information\n"
+ "\th - print help\n");
+ return;
+ }
+ else if (strcmp(ev->keyname, "s") == 0) /* get aspect status of the
+ * rectangles WRT size
+ * hints */
+ {
+ fprintf(stdout, "Top rectangle:\n");
+ _print_rect_stats(d.t_rect);
+
+ fprintf(stdout, "\nBottom rectangle:\n");
+ _print_rect_stats(d.b_rect);
+
+ return;
+ }
+
+ if (!rect) return;
+
+ if (strcmp(ev->keyname, "a") == 0) /* alignment hints */
+ {
+ (r_data->align_ptr)++;
+
+ if ((unsigned)
+ (((void *)(r_data->align_ptr)) - ((void *)(r_data->align))) >=
+ sizeof(r_data->align))
+ r_data->align_ptr = r_data->align;
+
+ evas_object_size_hint_align_set(
+ rect, r_data->align_ptr->x, r_data->align_ptr->y);
+
+ fprintf(stdout, "Changing align hints for %s rect. to (%f, %f)\n",
+ name, r_data->align_ptr->x, r_data->align_ptr->y);
+ return;
+ }
+
+ if (strcmp(ev->keyname, "m") == 0) /* min. size hints */
+ {
+ (r_data->min_ptr)++;
+
+ if ((unsigned)
+ (((void *)(r_data->min_ptr)) - ((void *)(r_data->min))) >=
+ sizeof(r_data->min))
+ r_data->min_ptr = r_data->min;
+
+ evas_object_size_hint_min_set(
+ rect, r_data->min_ptr->w, r_data->min_ptr->h);
+
+ fprintf(stdout, "Changing min. size hints for %s rect. to (%d, %d)\n",
+ name, r_data->min_ptr->w, r_data->min_ptr->h);
+ return;
+ }
+
+ if (strcmp(ev->keyname, "n") == 0) /* max. size hints */
+ {
+ (r_data->max_ptr)++;
+
+ if ((unsigned)
+ (((void *)(r_data->max_ptr)) - ((void *)(r_data->max))) >=
+ sizeof(r_data->max))
+ r_data->max_ptr = r_data->max;
+
+ evas_object_size_hint_max_set(
+ rect, r_data->max_ptr->w, r_data->max_ptr->h);
+
+ fprintf(stdout, "Changing max. size hints for %s rect. to (%d, %d)\n",
+ name, r_data->max_ptr->w, r_data->max_ptr->h);
+ return;
+ }
+
+ if (strcmp(ev->keyname, "p") == 0) /* padding size hints */
+ {
+ (r_data->padding_ptr)++;
+
+ if ((unsigned)
+ (((void *)(r_data->padding_ptr)) - ((void *)(r_data->padding))) >=
+ sizeof(r_data->padding))
+ r_data->padding_ptr = r_data->padding;
+
+ evas_object_size_hint_padding_set(
+ rect, r_data->padding_ptr->l, r_data->padding_ptr->r,
+ r_data->padding_ptr->t, r_data->padding_ptr->b);
+
+ fprintf(stdout, "Changing padding size hints for %s rect."
+ " to (%d, %d, %d, %d)\n",
+ name, r_data->padding_ptr->l, r_data->padding_ptr->r,
+ r_data->padding_ptr->t, r_data->padding_ptr->b);
+ return;
+ }
+
+ /* experiment with weights here. keep in mind that, for the box
+ * object, only if all the children have non zero weights this hint
+ * will have an effect */
+ if (strcmp(ev->keyname, "w") == 0) /* weight hints */
+ {
+ (r_data->weight_ptr)++;
+
+ if ((unsigned)
+ (((void *)(r_data->weight_ptr)) - ((void *)(r_data->weight))) >=
+ sizeof(r_data->weight))
+ r_data->weight_ptr = r_data->weight;
+
+ evas_object_size_hint_weight_set(
+ rect, r_data->weight_ptr->x, r_data->weight_ptr->y);
+
+ fprintf(stdout, "Changing weight hints for %s rect. to (%f, %f)\n",
+ name, r_data->weight_ptr->x, r_data->weight_ptr->y);
+ return;
+ }
+}
+
+static void
+_on_destroy(Ecore_Evas *ee __UNUSED__)
+{
+ ecore_main_loop_quit();
+}
+
+int
+main(void)
+{
+ if (!ecore_evas_init())
+ return EXIT_FAILURE;
+
+ /* init values one is going to cycle through while running this
+ * example */
+ struct rect_data init_data = \
+ {.min = {{30, 30}, {100, 70}, {200, 200}},
+ .max = {{100, 100}, {100, 70}, {300, 300}},
+ .align = {{0.0, 0.0}, {0.5, 0.5}, {1.0, 0.5}},
+ .weight = {{0.0, 0.0}, {3, 6}, {10, 100}},
+ .padding = {{0, 0, 0, 0}, {3, 6, 9, 12}, {10, 20, 0, 30}}};
+
+ d.t_data = init_data;
+
+ d.t_data.min_ptr = d.t_data.min;
+ d.t_data.max_ptr = d.t_data.max;
+ d.t_data.align_ptr = d.t_data.align;
+ d.t_data.weight_ptr = d.t_data.weight;
+ d.t_data.padding_ptr = d.t_data.padding;
+
+ d.b_data = init_data;
+
+ d.b_data.min_ptr = d.b_data.min;
+ d.b_data.max_ptr = d.b_data.max;
+ d.b_data.align_ptr = d.b_data.align;
+ d.b_data.weight_ptr = d.b_data.weight;
+ d.b_data.padding_ptr = d.b_data.padding;
+
+ /* 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_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);
+ evas_object_event_callback_add(
+ d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
+
+ /* Evas box with horizontal layout */
+ d.box = evas_object_box_add(d.canvas);
+ evas_object_box_layout_set(
+ d.box, evas_object_box_layout_vertical, NULL, NULL);
+ evas_object_move(d.box, (WIDTH / 4), (HEIGHT / 4));
+ evas_object_resize(d.box, (WIDTH / 2), (HEIGHT / 2));
+ evas_object_show(d.box);
+
+ /* this is a border around the box, container of the rectangles we
+ * are going to experiment with (changing some size hints). this
+ * way you can see how the container relates to the children */
+ d.border = evas_object_image_filled_add(d.canvas);
+ evas_object_image_file_set(d.border, border_img_path, NULL);
+ evas_object_image_border_set(d.border, 3, 3, 3, 3);
+ evas_object_image_border_center_fill_set(d.border, EVAS_BORDER_FILL_NONE);
+ evas_object_move(d.border, (WIDTH / 4) - 3, (HEIGHT / 4) - 3);
+ evas_object_resize(d.border, (WIDTH / 2) + 6, (HEIGHT / 2) + 6);
+ evas_object_show(d.border);
+
+ d.t_rect = evas_object_rectangle_add(d.canvas);
+ evas_object_color_set(d.t_rect, 0, 0, 255, 255);
+
+ evas_object_size_hint_min_set(d.t_rect, 100, 100);
+ evas_object_show(d.t_rect);
+ evas_object_box_append(d.box, d.t_rect);
+
+ d.b_rect = evas_object_rectangle_add(d.canvas);
+ evas_object_color_set(d.b_rect, 0, 255, 0, 255);
+
+ evas_object_size_hint_min_set(d.b_rect, 100, 100);
+ evas_object_show(d.b_rect);
+ evas_object_box_append(d.box, d.b_rect);
+
+ ecore_main_loop_begin();
+
+ 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");
+ return -1;
+}
+
* @note Use @c NULL pointers on the hint components you're not
* interested in: they'll be ignored by the function.
*
- * @see evas_object_size_hint_min_set()
+ * @see evas_object_size_hint_min_set() for an example
*/
EAPI void evas_object_size_hint_min_get (const Evas_Object *obj, Evas_Coord *w, Evas_Coord *h) EINA_ARG_NONNULL(1);
* Values @c 0 will be treated as unset hint components, when queried
* by managers.
*
+ * Example:
+ * @dontinclude evas-hints.c
+ * @skip evas_object_size_hint_min_set
+ * @until return
+ *
+ * In this example the minimum size hints change de behavior of an
+ * Evas box when layouting its children. See the full @ref
+ * Example_Evas_Size_Hints "example".
+ *
* @see evas_object_size_hint_min_get()
*/
EAPI void evas_object_size_hint_min_set (Evas_Object *obj, Evas_Coord w, Evas_Coord h) EINA_ARG_NONNULL(1);
* Values @c -1 will be treated as unset hint components, when queried
* by managers.
*
+ * Example:
+ * @dontinclude evas-hints.c
+ * @skip evas_object_size_hint_max_set
+ * @until return
+ *
+ * In this example the maximum size hints change de behavior of an
+ * Evas box when layouting its children. See the full @ref
+ * Example_Evas_Size_Hints "example".
+ *
* @see evas_object_size_hint_max_get()
*/
EAPI void evas_object_size_hint_max_set (Evas_Object *obj, Evas_Coord w, Evas_Coord h) EINA_ARG_NONNULL(1);
* This is not a size enforcement in any way, it's just a hint that
* should be used whenever appropriate.
*
+ * Example:
+ * @dontinclude evas-hints.c
+ * @skip evas_object_size_hint_align_set
+ * @until return
+ *
+ * In this example the alignment hints change de behavior of an Evas
+ * box when layouting its children. See the full @ref
+ * Example_Evas_Size_Hints "example".
+ *
* @see evas_object_size_hint_align_get()
*/
EAPI void evas_object_size_hint_align_set (Evas_Object *obj, double x, double y) EINA_ARG_NONNULL(1);
* @note Use @c NULL pointers on the hint components you're not
* interested in: they'll be ignored by the function.
*
- * @see evas_object_size_hint_weight_set()
+ * @see evas_object_size_hint_weight_set() for an example
*/
EAPI void evas_object_size_hint_weight_get (const Evas_Object *obj, double *x, double *y) EINA_ARG_NONNULL(1);
* This is not a size enforcement in any way, it's just a hint that should
* be used whenever appropriate.
*
+ * Example:
+ * @dontinclude evas-hints.c
+ * @skip evas_object_size_hint_weight_set
+ * @until return
+ *
+ * In this example the weight hints change de behavior of an Evas box
+ * when layouting its children. See the full @ref
+ * Example_Evas_Size_Hints "example".
+ *
* @see evas_object_size_hint_weight_get() for more information
*/
EAPI void evas_object_size_hint_weight_set (Evas_Object *obj, double x, double y) EINA_ARG_NONNULL(1);
* @note Use @c NULL pointers on the hint components you're not
* interested in: they'll be ignored by the function.
*
+ * Example:
+ * @dontinclude evas-hints.c
+ * @skip evas_object_size_hint_padding_set
+ * @until return
+ *
+ * In this example the padding hints change de behavior of an Evas box
+ * when layouting its children. See the full @ref
+ * Example_Evas_Size_Hints "example".
+ *
* @see evas_object_size_hint_padding_set()
*/
EAPI void evas_object_size_hint_padding_get (const Evas_Object *obj, Evas_Coord *l, Evas_Coord *r, Evas_Coord *t, Evas_Coord *b) EINA_ARG_NONNULL(1);
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