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timeline: Rework snapping signaling so it is easier to use

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API: GESTimeline::snap-started signal
API: GESTimeline::snap-ended signal

(This code has not been released so we can still change the API)
This commit is contained in:
Thibault Saunier 2012-04-25 14:55:46 -04:00
parent 606a788314
commit 28d73a4441
1 changed files with 85 additions and 21 deletions
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106
ges/ges-timeline.c
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@ -87,6 +87,11 @@ struct _MoveContext
* properties so we don't end up always needing new move context */
gboolean ignore_needs_ctx;
gboolean needs_move_ctx;
/* Last snapping properties */
GESTrackObject *last_snaped1;
GESTrackObject *last_snaped2;
GstClockTime last_snap_ts;
};
struct _GESTimelinePrivate
@ -151,7 +156,8 @@ enum
LAYER_ADDED,
LAYER_REMOVED,
DISCOVERY_ERROR,
OBJECT_SNAPPING,
SNAPING_STARTED,
SNAPING_ENDED,
LAST_SIGNAL
};
@ -358,13 +364,30 @@ ges_timeline_class_init (GESTimelineClass * klass)
* @obj2: the second #GESTrackObject that was snapping.
* @position: the position where the two objects finally snapping.
*
* Will be emitted after two track objects snapped together.
* Will be emitted when the 2 #GESTrackObject first snapped
*
* Since: 0.10.XX
*/
ges_timeline_signals[OBJECT_SNAPPING] =
g_signal_new ("track-objects-snapping", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, ges_marshal_VOID__OBJECT,
ges_timeline_signals[SNAPING_STARTED] =
g_signal_new ("snapping-started", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 3, GES_TYPE_TRACK_OBJECT, GES_TYPE_TRACK_OBJECT,
G_TYPE_UINT64);
/**
* GESTimeline::snapping-end:
* @timeline: the #GESTimeline
* @obj1: the first #GESTrackObject that was snapping.
* @obj2: the second #GESTrackObject that was snapping.
* @position: the position where the two objects finally snapping.
*
* Will be emitted when the 2 #GESTrackObject ended to snap
*
* Since: 0.10.XX
*/
ges_timeline_signals[SNAPING_ENDED] =
g_signal_new ("snapping-ended", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 3, GES_TYPE_TRACK_OBJECT, GES_TYPE_TRACK_OBJECT,
G_TYPE_UINT64);
}
@ -585,6 +608,9 @@ init_movecontext (MoveContext * mv_ctx)
mv_ctx->max_trim_pos = G_MAXUINT64;
mv_ctx->min_move_layer = G_MAXUINT;
mv_ctx->max_layer_prio = 0;
mv_ctx->last_snaped1 = NULL;
mv_ctx->last_snaped2 = NULL;
mv_ctx->last_snap_ts = GST_CLOCK_TIME_NONE;
}
static inline void
@ -653,20 +679,45 @@ ges_timeline_emit_snappig (GESTimeline * timeline, GESTrackObject * obj1,
guint64 * timecode)
{
GESTrackObject *obj2;
MoveContext *mv_ctx = &timeline->priv->movecontext;
if (timecode == NULL) {
if (mv_ctx->last_snaped1 != NULL && mv_ctx->last_snaped2 != NULL) {
g_signal_emit (timeline, ges_timeline_signals[SNAPING_ENDED], 0,
mv_ctx->last_snaped1, mv_ctx->last_snaped2, mv_ctx->last_snap_ts);
/* We then need to recalculate the moving context */
timeline->priv->movecontext.needs_move_ctx = TRUE;
}
return;
}
obj2 = g_hash_table_lookup (timeline->priv->by_object, timecode);
g_signal_emit (timeline, ges_timeline_signals[OBJECT_SNAPPING], 0,
obj1, obj2, *timecode);
if (mv_ctx->last_snap_ts != *timecode) {
g_signal_emit (timeline, ges_timeline_signals[SNAPING_ENDED], 0,
mv_ctx->last_snaped1, mv_ctx->last_snaped2, mv_ctx->last_snap_ts);
/* We then need to recalculate the moving context */
timeline->priv->movecontext.needs_move_ctx = TRUE;
/* We want the snap start signal to be emited anyway */
mv_ctx->last_snap_ts = GST_CLOCK_TIME_NONE;
}
if (GST_CLOCK_TIME_IS_VALID (mv_ctx->last_snap_ts) == FALSE) {
mv_ctx->last_snaped1 = obj1;
mv_ctx->last_snaped2 = obj2;
mv_ctx->last_snap_ts = *timecode;
g_signal_emit (timeline, ges_timeline_signals[SNAPING_STARTED], 0,
obj1, obj2, *timecode);
}
}
/* If passing @trackobj will emit the snapping signal, otherwize it won't */
static guint64 *
ges_timeline_snap_position (GESTimeline * timeline, GESTrackObject * trackobj,
guint64 * current, guint64 timecode)
guint64 * current, guint64 timecode, gboolean emit)
{
GESTimelinePrivate *priv = timeline->priv;
GSequenceIter *iter, *prev_iter, *nxt_iter;
@ -724,8 +775,11 @@ ges_timeline_snap_position (GESTimeline * timeline, GESTrackObject * trackobj,
/* We emit the snapping signal only if we snapped with a different value
* than the current one */
if (trackobj && ret)
if (emit) {
ges_timeline_emit_snappig (timeline, trackobj, ret);
GST_DEBUG_OBJECT (timeline, "Snaping at %" GST_TIME_FORMAT,
GST_TIME_ARGS (*ret));
}
return ret;
}
@ -895,7 +949,8 @@ ges_timeline_trim_object_simple (GESTimeline * timeline, GESTrackObject * obj,
if (snapping) {
cur = g_hash_table_lookup (timeline->priv->by_start, obj);
snapped = ges_timeline_snap_position (timeline, obj, cur, position);
snapped = ges_timeline_snap_position (timeline, obj, cur, position,
TRUE);
if (snapped)
position = *snapped;
}
@ -919,7 +974,7 @@ ges_timeline_trim_object_simple (GESTimeline * timeline, GESTrackObject * obj,
case GES_EDGE_END:
{
cur = g_hash_table_lookup (timeline->priv->by_end, obj);
snapped = ges_timeline_snap_position (timeline, obj, cur, position);
snapped = ges_timeline_snap_position (timeline, obj, cur, position, TRUE);
if (snapped)
position = *snapped;
@ -962,7 +1017,7 @@ timeline_ripple_object (GESTimeline * timeline, GESTrackObject * obj,
GST_DEBUG ("Simply rippling");
cur = g_hash_table_lookup (timeline->priv->by_end, obj);
snapped = ges_timeline_snap_position (timeline, obj, cur, position);
snapped = ges_timeline_snap_position (timeline, obj, cur, position, TRUE);
if (snapped)
position = *snapped;
@ -994,7 +1049,7 @@ timeline_ripple_object (GESTimeline * timeline, GESTrackObject * obj,
GST_DEBUG ("Rippling end");
cur = g_hash_table_lookup (timeline->priv->by_end, obj);
snapped = ges_timeline_snap_position (timeline, obj, cur, position);
snapped = ges_timeline_snap_position (timeline, obj, cur, position, TRUE);
if (snapped)
position = *snapped;
@ -1109,7 +1164,7 @@ timeline_roll_object (GESTimeline * timeline, GESTrackObject * obj,
goto error;
cur = g_hash_table_lookup (timeline->priv->by_start, obj);
snapped = ges_timeline_snap_position (timeline, obj, cur, position);
snapped = ges_timeline_snap_position (timeline, obj, cur, position, TRUE);
if (snapped)
position = *snapped;
@ -1147,7 +1202,7 @@ timeline_roll_object (GESTimeline * timeline, GESTrackObject * obj,
end = obj->start + obj->duration;
cur = g_hash_table_lookup (timeline->priv->by_end, obj);
snapped = ges_timeline_snap_position (timeline, obj, cur, position);
snapped = ges_timeline_snap_position (timeline, obj, cur, position, TRUE);
if (snapped)
position = *snapped;
@ -1214,28 +1269,37 @@ ges_timeline_move_object_simple (GESTimeline * timeline,
{
guint64 *snap_end, *snap_st, *cur, off1, off2, end;
GST_DEBUG_OBJECT (timeline, "Moving to %" GST_TIME_FORMAT,
GST_TIME_ARGS (position));
end = position + object->duration;
cur = g_hash_table_lookup (timeline->priv->by_end, object);
snap_end = ges_timeline_snap_position (timeline, object, cur, end);
snap_end = ges_timeline_snap_position (timeline, object, cur, end, FALSE);
if (snap_end)
off1 = end > *snap_end ? end - *snap_end : *snap_end - end;
else
off1 = G_MAXUINT64;
cur = g_hash_table_lookup (timeline->priv->by_start, object);
snap_st = ges_timeline_snap_position (timeline, object, cur, position);
snap_st = ges_timeline_snap_position (timeline, object, cur, position, FALSE);
if (snap_st)
off2 = position > *snap_st ? position - *snap_st : *snap_st - position;
else
off2 = G_MAXUINT64;
/* In the case we could snap on both sides, we snap on the end */
if (snap_end && off1 <= off2) {
position = position + *snap_end - end;
ges_timeline_emit_snappig (timeline, object, snap_end);
GST_DEBUG_OBJECT (timeline, "Real snap at %" GST_TIME_FORMAT,
GST_TIME_ARGS (position));
} else if (snap_st) {
position = position + *snap_st - position;
ges_timeline_emit_snappig (timeline, object, snap_st);
}
GST_DEBUG_OBJECT (timeline, "Real snap at %" GST_TIME_FORMAT,
GST_TIME_ARGS (position));
} else
ges_timeline_emit_snappig (timeline, object, NULL);
ges_track_object_set_start (object, position);