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test-scrolling: Animate intermediate positions

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Animating intermediate positions in the viewport panning is a neat
effect.
This commit is contained in:
Emmanuele Bassi 2010-05-27 12:32:45 +01:00
parent b77c0c91d7
commit aab411bde4
1 changed files with 28 additions and 4 deletions
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32
tests/interactive/test-scrolling.c
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@ -1,9 +1,10 @@
#include <stdlib.h>
#include <math.h>
#include <gmodule.h>
#include <clutter/clutter.h>
#define RECT_WIDTH 300
#define RECT_HEIGHT 200
#define RECT_WIDTH 400
#define RECT_HEIGHT 300
#define N_RECTS 7
static const gchar *rect_color[N_RECTS] = {
@ -28,7 +29,10 @@ on_drag_end (ClutterDragAction *action,
ClutterModifierType modifiers)
{
gfloat viewport_x = clutter_actor_get_x (viewport);
gfloat offset_x;
gint child_visible;
/* check if we're at the viewport edges */
if (viewport_x > 0)
{
clutter_actor_animate (viewport, CLUTTER_EASE_OUT_QUAD, 250,
@ -44,6 +48,22 @@ on_drag_end (ClutterDragAction *action,
NULL);
return;
}
/* animate the viewport to fully show the child once we pass
* a certain threshold with the dragging action
*/
offset_x = fabsf (viewport_x) / RECT_WIDTH + 0.5f;
if (offset_x > (RECT_WIDTH * 0.33))
child_visible = (int) offset_x + 1;
else
child_visible = (int) offset_x;
/* sanity check on the children number */
child_visible = CLAMP (child_visible, 0, N_RECTS);
clutter_actor_animate (viewport, CLUTTER_EASE_OUT_QUAD, 250,
"x", (-1.0f * RECT_WIDTH * child_visible),
NULL);
}
G_MODULE_EXPORT int
@ -66,11 +86,11 @@ test_scrolling_main (int argc, char *argv[])
* the stage and set it to clip its contents to the allocated size
*/
scroll = clutter_group_new ();
clutter_container_add_actor (CLUTTER_CONTAINER (stage), scroll);
clutter_actor_set_size (scroll, RECT_WIDTH, RECT_HEIGHT);
clutter_actor_add_constraint (scroll, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (scroll, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_actor_set_clip_to_allocation (scroll, TRUE);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), scroll);
/* viewport: the actual container for the children; we scroll it using
* the Drag action constrained to the horizontal axis, and every time
@ -80,11 +100,15 @@ test_scrolling_main (int argc, char *argv[])
viewport = clutter_box_new (clutter_box_layout_new ());
clutter_container_add_actor (CLUTTER_CONTAINER (scroll), viewport);
/* add dragging capabilities to the viewport; the heavy lifting is
* all done by the DragAction itself, plus the ::drag-end signal
* handler in our code
*/
action = clutter_drag_action_new ();
clutter_actor_add_action (viewport, action);
clutter_drag_action_set_drag_axis (CLUTTER_DRAG_ACTION (action),
CLUTTER_DRAG_X_AXIS);
g_signal_connect (action, "drag-end", G_CALLBACK (on_drag_end), NULL);
clutter_actor_add_action (viewport, action);
clutter_actor_set_reactive (viewport, TRUE);
/* children of the viewport */