379 lines
11 KiB
C
379 lines
11 KiB
C
/**
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* Simple Evas example illustrating <b>alignment, minimum size, maximum
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* size, padding and weight</b> hints on objects.
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*
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* To exemplify those hints, whe use the Evas box object, one of the
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* managers using size hints to layout its children.
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*
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* You'll need at least one engine built for it (excluding the buffer
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* one) and the png image loader also built. See stdout/stderr for
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* output.
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*
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* @verbatim
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* gcc -o evas-events evas-events.c `pkg-config --libs --cflags ecore-evas`
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* @endverbatim
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#else
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#define __UNUSED__
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#endif
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#include <Ecore.h>
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#include <Ecore_Evas.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define WIDTH 320
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#define HEIGHT 480
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#define PACKAGE_EXAMPLES_DIR "."
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static const char commands[] = \
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"commands are:\n"
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"\tShift + a - change alignment hints on top rectangle\n"
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"\tShift + m - change min. size hint on top rectangle\n"
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"\tShift + n - change max. size hint on top rectangle\n"
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"\tShift + p - change padding hints on top rectangle\n"
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"\tShift + w - change weight hints on top rectangle\n\n"
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"\tControl + a - change alignment hints on bottom rectangle\n"
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"\tControl + m - change min. size hint on bottom rectangle\n"
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"\tControl + n - change max. size hint on bottom rectangle\n"
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"\tControl + p - change padding hints on bottom rectangle\n"
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"\tControl + w - change weight hints on bottom rectangle\n\n"
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"\ts - print current hints information\n"
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"\th - print help\n";
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static const char *border_img_path = PACKAGE_EXAMPLES_DIR "/red.png";
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struct coord_tuple
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{
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Evas_Coord w, h;
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};
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struct weight_tuple
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{
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double x, y;
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};
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struct padding_tuple
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{
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Evas_Coord l, r, t, b;
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};
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struct rect_data
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{
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struct coord_tuple *min_ptr;
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struct coord_tuple min[4];
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struct coord_tuple *max_ptr;
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struct coord_tuple max[4];
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struct weight_tuple *align_ptr;
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struct weight_tuple align[3];
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struct weight_tuple *weight_ptr;
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struct weight_tuple weight[3];
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struct padding_tuple *padding_ptr;
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struct padding_tuple padding[3];
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};
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struct test_data
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{
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Ecore_Evas *ee;
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Evas *canvas;
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struct rect_data t_data, b_data;
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Evas_Object *bg, *box, *t_rect, *b_rect, *border;
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};
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static struct test_data d = {0};
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/* here just to keep our example's window size and background image's
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* size in synchrony */
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static void
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_canvas_resize_cb(Ecore_Evas *ee)
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{
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int w, h;
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ecore_evas_geometry_get(ee, NULL, NULL, &w, &h);
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evas_object_resize(d.bg, w, h);
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evas_object_move(d.box, (w / 4), (h / 4));
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evas_object_resize(d.box, (w / 2), (h / 2));
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evas_object_move(d.border, (w / 4) - 3, (h / 4) - 3);
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evas_object_resize(d.border, (w / 2) + 6, (h / 2) + 6);
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}
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static void
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_print_rect_stats(Evas_Object *rect)
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{
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Evas_Coord w, h, l, r, t, b;
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double x, y;
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evas_object_size_hint_align_get(rect, &x, &y);
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fprintf(stdout, "\talign hints: h(%f), v(%f)\n", x, y);
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evas_object_size_hint_min_get(rect, &w, &h);
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fprintf(stdout, "\tmin. size hints: h(%d), v(%d)\n", w, h);
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evas_object_size_hint_max_get(rect, &w, &h);
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fprintf(stdout, "\tmax. size hints: h(%d), v(%d)\n", w, h);
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evas_object_size_hint_padding_get(rect, &l, &r, &t, &b);
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fprintf(stdout, "\tpadding hints: l(%d), r(%d), t(%d), b(%d)\n",
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l, r, t, b);
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evas_object_size_hint_weight_get(rect, &x, &y);
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fprintf(stdout, "\tweight hints: h(%f), v(%f)\n", x, y);
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}
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/* use the following commands to interact with this example - 'h' is
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* the key for help */
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static void
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_on_keydown(void *data __UNUSED__,
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Evas *evas __UNUSED__,
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Evas_Object *o __UNUSED__,
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void *einfo)
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{
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Evas_Event_Key_Down *ev = einfo;
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struct rect_data *r_data = NULL;
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const Evas_Modifier *mods;
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Evas_Object *rect = NULL;
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const char *name = NULL;
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mods = evas_key_modifier_get(evas);
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if (evas_key_modifier_is_set(mods, "Shift"))
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{
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rect = d.t_rect;
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r_data = &d.t_data;
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name = "top";
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}
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else if (evas_key_modifier_is_set(mods, "Control"))
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{
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rect = d.b_rect;
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r_data = &d.b_data;
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name = "bottom";
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}
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else if (strcmp(ev->keyname, "h") == 0) /* print help */
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{
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fprintf(stdout, commands);
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return;
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}
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else if (strcmp(ev->keyname, "s") == 0) /* get aspect status of the
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* rectangles WRT size
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* hints */
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{
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fprintf(stdout, "Top rectangle:\n");
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_print_rect_stats(d.t_rect);
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fprintf(stdout, "\nBottom rectangle:\n");
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_print_rect_stats(d.b_rect);
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return;
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}
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if (!rect) return;
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if (strcmp(ev->keyname, "a") == 0) /* alignment hints */
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{
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(r_data->align_ptr)++;
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if ((unsigned)
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(((void *)(r_data->align_ptr)) - ((void *)(r_data->align))) >=
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sizeof(r_data->align))
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r_data->align_ptr = r_data->align;
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evas_object_size_hint_align_set(
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rect, r_data->align_ptr->x, r_data->align_ptr->y);
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fprintf(stdout, "Changing align hints for %s rect. to (%f, %f)\n",
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name, r_data->align_ptr->x, r_data->align_ptr->y);
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return;
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}
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if (strcmp(ev->keyname, "m") == 0) /* min. size hints */
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{
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(r_data->min_ptr)++;
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if ((unsigned)
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(((void *)(r_data->min_ptr)) - ((void *)(r_data->min))) >=
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sizeof(r_data->min))
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r_data->min_ptr = r_data->min;
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evas_object_size_hint_min_set(
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rect, r_data->min_ptr->w, r_data->min_ptr->h);
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fprintf(stdout, "Changing min. size hints for %s rect. to (%d, %d)\n",
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name, r_data->min_ptr->w, r_data->min_ptr->h);
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return;
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}
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if (strcmp(ev->keyname, "n") == 0) /* max. size hints */
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{
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(r_data->max_ptr)++;
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if ((unsigned)
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(((void *)(r_data->max_ptr)) - ((void *)(r_data->max))) >=
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sizeof(r_data->max))
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r_data->max_ptr = r_data->max;
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evas_object_size_hint_max_set(
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rect, r_data->max_ptr->w, r_data->max_ptr->h);
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fprintf(stdout, "Changing max. size hints for %s rect. to (%d, %d)\n",
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name, r_data->max_ptr->w, r_data->max_ptr->h);
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return;
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}
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if (strcmp(ev->keyname, "p") == 0) /* padding size hints */
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{
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(r_data->padding_ptr)++;
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if ((unsigned)
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(((void *)(r_data->padding_ptr)) - ((void *)(r_data->padding))) >=
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sizeof(r_data->padding))
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r_data->padding_ptr = r_data->padding;
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evas_object_size_hint_padding_set(
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rect, r_data->padding_ptr->l, r_data->padding_ptr->r,
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r_data->padding_ptr->t, r_data->padding_ptr->b);
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fprintf(stdout, "Changing padding size hints for %s rect."
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" to (%d, %d, %d, %d)\n",
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name, r_data->padding_ptr->l, r_data->padding_ptr->r,
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r_data->padding_ptr->t, r_data->padding_ptr->b);
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return;
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}
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/* experiment with weights here. keep in mind that, for the box
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* object, only if all the children have non zero weights this hint
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* will have an effect */
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if (strcmp(ev->keyname, "w") == 0) /* weight hints */
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{
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(r_data->weight_ptr)++;
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if ((unsigned)
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(((void *)(r_data->weight_ptr)) - ((void *)(r_data->weight))) >=
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sizeof(r_data->weight))
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r_data->weight_ptr = r_data->weight;
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evas_object_size_hint_weight_set(
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rect, r_data->weight_ptr->x, r_data->weight_ptr->y);
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fprintf(stdout, "Changing weight hints for %s rect. to (%f, %f)\n",
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name, r_data->weight_ptr->x, r_data->weight_ptr->y);
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return;
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}
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}
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static void
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_on_destroy(Ecore_Evas *ee __UNUSED__)
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{
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ecore_main_loop_quit();
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}
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int
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main(void)
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{
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if (!ecore_evas_init())
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return EXIT_FAILURE;
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/* init values one is going to cycle through while running this
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* example */
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struct rect_data init_data = \
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{
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.min = {{0, 0}, {30, 30}, {100, 70}, {200, 200}},
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.max = {{0, 0}, {100, 100}, {100, 70}, {300, 300}},
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.align = {{0.0, 0.0}, {0.5, 0.5}, {1.0, 0.5}},
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.weight = {{0.0, 0.0}, {3, 6}, {10, 100}},
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.padding = {{0, 0, 0, 0}, {3, 6, 9, 12}, {10, 20, 0, 30}}
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};
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d.t_data = init_data;
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d.t_data.min_ptr = d.t_data.min + 1;
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d.t_data.max_ptr = d.t_data.max + 1;
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d.t_data.align_ptr = d.t_data.align;
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d.t_data.weight_ptr = d.t_data.weight;
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d.t_data.padding_ptr = d.t_data.padding;
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d.b_data = init_data;
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d.b_data.min_ptr = d.b_data.min + 1;
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d.b_data.max_ptr = d.b_data.max + 1;
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d.b_data.align_ptr = d.b_data.align;
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d.b_data.weight_ptr = d.b_data.weight;
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d.b_data.padding_ptr = d.b_data.padding;
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/* this will give you a window with an Evas canvas under the first
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* engine available */
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d.ee = ecore_evas_new(NULL, 0, 0, WIDTH, HEIGHT, NULL);
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if (!d.ee)
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goto error;
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ecore_evas_callback_destroy_set(d.ee, _on_destroy);
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ecore_evas_callback_resize_set(d.ee, _canvas_resize_cb);
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ecore_evas_show(d.ee);
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/* the canvas pointer, de facto */
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d.canvas = ecore_evas_get(d.ee);
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d.bg = evas_object_rectangle_add(d.canvas);
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evas_object_color_set(d.bg, 255, 255, 255, 255); /* white bg */
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evas_object_move(d.bg, 0, 0); /* at canvas' origin */
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evas_object_resize(d.bg, WIDTH, HEIGHT); /* covers full canvas */
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evas_object_show(d.bg);
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evas_object_focus_set(d.bg, EINA_TRUE);
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evas_object_event_callback_add(
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d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
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/* Evas box with vertical layout */
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d.box = evas_object_box_add(d.canvas);
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evas_object_box_layout_set(
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d.box, evas_object_box_layout_vertical, NULL, NULL);
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evas_object_show(d.box);
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/* this is a border around the box, container of the rectangles we
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* are going to experiment with (changing some size hints). this
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* way you can see how the container relates to the children */
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d.border = evas_object_image_filled_add(d.canvas);
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evas_object_image_file_set(d.border, border_img_path, NULL);
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evas_object_image_border_set(d.border, 3, 3, 3, 3);
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evas_object_image_border_center_fill_set(d.border, EVAS_BORDER_FILL_NONE);
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evas_object_show(d.border);
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d.t_rect = evas_object_rectangle_add(d.canvas);
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evas_object_color_set(d.t_rect, 0, 0, 255, 255);
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evas_object_size_hint_min_set(
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d.t_rect, d.t_data.min_ptr->w, d.t_data.min_ptr->h);
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evas_object_show(d.t_rect);
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evas_object_box_append(d.box, d.t_rect);
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d.b_rect = evas_object_rectangle_add(d.canvas);
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evas_object_color_set(d.b_rect, 0, 255, 0, 255);
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evas_object_size_hint_min_set(
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d.b_rect, d.b_data.min_ptr->w, d.b_data.min_ptr->h);
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evas_object_show(d.b_rect);
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evas_object_box_append(d.box, d.b_rect);
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_canvas_resize_cb(d.ee);
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fprintf(stdout, commands);
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ecore_main_loop_begin();
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ecore_evas_shutdown();
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return 0;
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error:
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fprintf(stderr, "You got to have at least one evas engine built and linked"
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" up to ecore-evas for this example to run properly.\n");
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return -1;
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}
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