145 lines
4.3 KiB
C
145 lines
4.3 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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#ifdef CLUTTER_WINDOWING_X11
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#include <clutter/x11/clutter-x11.h>
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#endif
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static ClutterActor *
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create_content_actor (void)
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{
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ClutterActor *content;
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ClutterContent *image;
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GdkPixbuf *pixbuf;
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content = clutter_actor_new ();
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clutter_actor_set_size (content, 720, 720);
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pixbuf = gdk_pixbuf_new_from_file ("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 (content,
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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 (content, CLUTTER_CONTENT_GRAVITY_RESIZE_ASPECT);
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clutter_actor_set_content (content, image);
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g_object_unref (image);
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return content;
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}
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static gboolean
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on_pan (ClutterPanAction *action,
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ClutterActor *scroll,
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gboolean is_interpolated,
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gpointer *user_data)
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{
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gfloat delta_x, delta_y;
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const ClutterEvent *event = NULL;
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if (is_interpolated)
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clutter_pan_action_get_interpolated_delta (action, &delta_x, &delta_y);
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else
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{
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clutter_gesture_action_get_motion_delta (CLUTTER_GESTURE_ACTION (action), 0, &delta_x, &delta_y);
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event = clutter_gesture_action_get_last_event (CLUTTER_GESTURE_ACTION (action), 0);
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}
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g_print ("[%s] panning dx:%.2f dy:%.2f\n",
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event == NULL ? "INTERPOLATED" :
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event->type == CLUTTER_MOTION ? "MOTION" :
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event->type == CLUTTER_TOUCH_UPDATE ? "TOUCH UPDATE" :
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"?",
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delta_x, delta_y);
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return TRUE;
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}
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static ClutterActor *
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create_scroll_actor (ClutterActor *stage)
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{
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ClutterActor *scroll;
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ClutterAction *pan_action;
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/* our scrollable viewport */
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scroll = clutter_actor_new ();
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clutter_actor_set_name (scroll, "scroll");
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clutter_actor_add_constraint (scroll, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0));
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clutter_actor_add_constraint (scroll, clutter_bind_constraint_new (stage, CLUTTER_BIND_SIZE, 0));
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clutter_actor_add_child (scroll, create_content_actor ());
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pan_action = clutter_pan_action_new ();
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clutter_pan_action_set_interpolate (CLUTTER_PAN_ACTION (pan_action), TRUE);
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g_signal_connect (pan_action, "pan", G_CALLBACK (on_pan), NULL);
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clutter_actor_add_action (scroll, pan_action);
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clutter_actor_set_reactive (scroll, TRUE);
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return scroll;
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}
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static gboolean
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on_key_press (ClutterActor *stage,
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ClutterEvent *event,
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gpointer unused)
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{
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ClutterActor *scroll;
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guint key_symbol;
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scroll = clutter_actor_get_first_child (stage);
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key_symbol = clutter_event_get_key_symbol (event);
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if (key_symbol == CLUTTER_KEY_space)
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{
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clutter_actor_save_easing_state (scroll);
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clutter_actor_set_easing_duration (scroll, 1000);
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clutter_actor_set_child_transform (scroll, NULL);
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clutter_actor_restore_easing_state (scroll);
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}
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return CLUTTER_EVENT_STOP;
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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, *scroll, *info;
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if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
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return EXIT_FAILURE;
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/* create a new stage */
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stage = clutter_stage_new ();
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clutter_stage_set_title (CLUTTER_STAGE (stage), "Pan Action");
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clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
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scroll = create_scroll_actor (stage);
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clutter_actor_add_child (stage, scroll);
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info = clutter_text_new_with_text (NULL, "Press <space> to reset the image position.");
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clutter_actor_add_child (stage, info);
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clutter_actor_set_position (info, 12, 12);
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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g_signal_connect (stage, "key-press-event", G_CALLBACK (on_key_press), scroll);
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clutter_actor_show (stage);
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clutter_main ();
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return EXIT_SUCCESS;
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}
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