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TapAction is a GestureAction-subclass that handles clicks and tap gestures. It is meant to provide a replacement for ClickAction using GestureAction: • it handles events trasparently without capturing them, so that it can coexists with other GestureActions; • the ::tap signal is not emitted if the drag threshold is exceeded; • building upon GestureAction the amount of code is greatly reduced. TapAction provides: • tap signal, notifying users when a tap has been performed. The image-content example program has been updated replacing its ClickAction usage with TapAction. https://bugzilla.gnome.org/show_bug.cgi?id=683948
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
#include <stdlib.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <clutter/clutter.h>
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static const struct {
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ClutterContentGravity gravity;
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const char *name;
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} gravities[] = {
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{ CLUTTER_CONTENT_GRAVITY_TOP_LEFT, "Top Left" },
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{ CLUTTER_CONTENT_GRAVITY_TOP, "Top" },
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{ CLUTTER_CONTENT_GRAVITY_TOP_RIGHT, "Top Right" },
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{ CLUTTER_CONTENT_GRAVITY_LEFT, "Left" },
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{ CLUTTER_CONTENT_GRAVITY_CENTER, "Center" },
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{ CLUTTER_CONTENT_GRAVITY_RIGHT, "Right" },
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{ CLUTTER_CONTENT_GRAVITY_BOTTOM_LEFT, "Bottom Left" },
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{ CLUTTER_CONTENT_GRAVITY_BOTTOM, "Bottom" },
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{ CLUTTER_CONTENT_GRAVITY_BOTTOM_RIGHT, "Bottom Right" },
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{ CLUTTER_CONTENT_GRAVITY_RESIZE_FILL, "Resize Fill" },
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{ CLUTTER_CONTENT_GRAVITY_RESIZE_ASPECT, "Resize Aspect" },
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};
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static int n_gravities = G_N_ELEMENTS (gravities);
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static int cur_gravity = 0;
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static void
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on_tap (ClutterTapAction *action,
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ClutterActor *actor,
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ClutterText *label)
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{
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gchar *str;
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clutter_actor_save_easing_state (actor);
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clutter_actor_set_content_gravity (actor, gravities[cur_gravity].gravity);
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clutter_actor_restore_easing_state (actor);
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str = g_strconcat ("Content gravity: ", gravities[cur_gravity].name, NULL);
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clutter_text_set_text (label, str);
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g_free (str);
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cur_gravity += 1;
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if (cur_gravity >= n_gravities)
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cur_gravity = 0;
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}
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int
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main (int argc, char *argv[])
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{
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ClutterActor *stage, *box, *text;
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ClutterContent *image;
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ClutterAction *action;
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GdkPixbuf *pixbuf;
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gchar *str;
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if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
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return EXIT_FAILURE;
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stage = clutter_stage_new ();
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clutter_actor_set_name (stage, "Stage");
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clutter_stage_set_title (CLUTTER_STAGE (stage), "Content Box");
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clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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clutter_actor_show (stage);
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box = clutter_actor_new ();
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clutter_actor_set_name (box, "Image");
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clutter_actor_set_margin_top (box, 12);
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clutter_actor_set_margin_right (box, 12);
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clutter_actor_set_margin_bottom (box, 12);
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clutter_actor_set_margin_left (box, 12);
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clutter_actor_add_constraint (box, clutter_bind_constraint_new (stage, CLUTTER_BIND_SIZE, 0.0));
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clutter_actor_add_child (stage, box);
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pixbuf = gdk_pixbuf_new_from_file (TESTS_DATADIR G_DIR_SEPARATOR_S "redhand.png", NULL);
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image = clutter_image_new ();
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clutter_image_set_data (CLUTTER_IMAGE (image),
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gdk_pixbuf_get_pixels (pixbuf),
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gdk_pixbuf_get_has_alpha (pixbuf)
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? COGL_PIXEL_FORMAT_RGBA_8888
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: COGL_PIXEL_FORMAT_RGB_888,
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gdk_pixbuf_get_width (pixbuf),
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gdk_pixbuf_get_height (pixbuf),
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gdk_pixbuf_get_rowstride (pixbuf),
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NULL);
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g_object_unref (pixbuf);
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clutter_actor_set_content_scaling_filters (box,
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CLUTTER_SCALING_FILTER_TRILINEAR,
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CLUTTER_SCALING_FILTER_LINEAR);
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clutter_actor_set_content_gravity (box, gravities[n_gravities - 1].gravity);
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clutter_actor_set_content (box, image);
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g_object_unref (image);
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str = g_strconcat ("Content gravity: ",
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gravities[n_gravities - 1].name,
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NULL);
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text = clutter_text_new ();
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clutter_text_set_text (CLUTTER_TEXT (text), str);
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clutter_actor_add_constraint (text, clutter_align_constraint_new (stage, CLUTTER_ALIGN_BOTH, 0.5));
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clutter_actor_add_child (stage, text);
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g_free (str);
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action = clutter_tap_action_new ();
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g_signal_connect (action, "tap", G_CALLBACK (on_tap), text);
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clutter_actor_set_reactive (box, TRUE);
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clutter_actor_add_action (box, action);
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clutter_main ();
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return EXIT_SUCCESS;
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}
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