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|
use scene::{SceneTracks, Track};
use time::MediaTime;
use super::compatibility::get_track_type_for_element_type;
use super::insert_index::{
get_default_insert_index_for_track, get_highest_insert_index_for_track,
resolve_preferred_new_track_placement,
};
use super::main_track::enforce_main_track_start;
use super::overlap::can_place_time_spans_on_track;
use super::{
InsertDirection, NewTrackPosition, PlacementResult, PlacementStrategy, PlacementSubject,
PlacementTimeSpan, VerticalDragDirection, ordered_tracks,
};
use crate::types::TrackType;
pub struct ResolveTrackPlacementParams {
pub tracks: SceneTracks,
pub subject: PlacementSubject,
pub time_spans: Vec<PlacementTimeSpan>,
pub strategy: PlacementStrategy,
}
fn build_existing_track_result(
track: &Track,
track_index: usize,
tracks: &SceneTracks,
time_spans: &[PlacementTimeSpan],
) -> PlacementResult {
let first_span = time_spans.first();
let requested_start_time = first_span
.map(|span| span.start_time)
.unwrap_or(MediaTime::ZERO);
let adjusted_start_time = enforce_main_track_start(
tracks,
track.id(),
requested_start_time,
first_span.and_then(|span| span.exclude_element_id.as_deref()),
);
PlacementResult::ExistingTrack {
track_id: track.id().to_string(),
track_index,
track_type: TrackType::of_track(track),
adjusted_start_time: (adjusted_start_time != requested_start_time)
.then_some(adjusted_start_time),
}
}
fn build_new_track_result(
track_type: TrackType,
insert_index: usize,
insert_position: Option<InsertDirection>,
) -> PlacementResult {
PlacementResult::NewTrack {
track_type,
insert_index,
insert_position,
}
}
fn find_first_available_track_index(
tracks: &[&Track],
track_type: TrackType,
time_spans: &[PlacementTimeSpan],
) -> Option<usize> {
tracks.iter().position(|track| {
TrackType::of_track(track) == track_type
&& can_place_time_spans_on_track(track.elements(), time_spans)
})
}
fn resolve_always_new_track(
tracks: &SceneTracks,
track_type: TrackType,
position: NewTrackPosition,
) -> PlacementResult {
let insert_index = match position {
NewTrackPosition::Highest => get_highest_insert_index_for_track(tracks, track_type),
NewTrackPosition::Default => get_default_insert_index_for_track(tracks, track_type),
};
build_new_track_result(track_type, insert_index, None)
}
fn get_insert_direction(
hover_direction: InsertDirection,
vertical_drag_direction: Option<VerticalDragDirection>,
) -> InsertDirection {
match vertical_drag_direction {
Some(VerticalDragDirection::Up) => InsertDirection::Above,
Some(VerticalDragDirection::Down) => InsertDirection::Below,
None => hover_direction,
}
}
pub fn resolve_track_placement(params: &ResolveTrackPlacementParams) -> Option<PlacementResult> {
let tracks = ¶ms.tracks;
let ordered = ordered_tracks(tracks);
let track_type = match params.subject {
PlacementSubject::TrackType(track_type) => track_type,
PlacementSubject::ElementType(element_type) => {
get_track_type_for_element_type(element_type)
}
};
let time_spans = ¶ms.time_spans;
match ¶ms.strategy {
PlacementStrategy::Explicit { track_id } => {
let track_index = ordered.iter().position(|track| track.id() == track_id)?;
let track = ordered[track_index];
if TrackType::of_track(track) != track_type {
return None;
}
Some(build_existing_track_result(
track,
track_index,
tracks,
time_spans,
))
}
PlacementStrategy::FirstAvailable => {
if let Some(existing_index) =
find_first_available_track_index(&ordered, track_type, time_spans)
{
return Some(build_existing_track_result(
ordered[existing_index],
existing_index,
tracks,
time_spans,
));
}
Some(resolve_always_new_track(
tracks,
track_type,
NewTrackPosition::Highest,
))
}
PlacementStrategy::PreferIndex {
track_index,
hover_direction,
vertical_drag_direction,
create_new_track_only,
} => {
let preferred_track = ordered.get(*track_index);
let is_preferred_compatible = preferred_track
.is_some_and(|track| TrackType::of_track(track) == track_type);
let can_use_existing = !create_new_track_only
&& is_preferred_compatible
&& preferred_track.is_some_and(|track| {
can_place_time_spans_on_track(track.elements(), time_spans)
});
if can_use_existing {
return Some(build_existing_track_result(
preferred_track?,
*track_index,
tracks,
time_spans,
));
}
let direction = get_insert_direction(
*hover_direction,
if is_preferred_compatible {
None
} else {
*vertical_drag_direction
},
);
let placement = resolve_preferred_new_track_placement(
tracks,
track_type,
*track_index,
direction,
);
Some(build_new_track_result(
track_type,
placement.insert_index,
placement.insert_position,
))
}
PlacementStrategy::AboveSource { source_track_index } => {
let above_track = source_track_index
.checked_sub(1)
.and_then(|above_index| ordered.get(above_index));
if let Some(above_track) = above_track
&& TrackType::of_track(above_track) == track_type
&& can_place_time_spans_on_track(above_track.elements(), time_spans)
{
return Some(build_existing_track_result(
above_track,
source_track_index - 1,
tracks,
time_spans,
));
}
if let Some(first_available_index) =
find_first_available_track_index(&ordered, track_type, time_spans)
{
return Some(build_existing_track_result(
ordered[first_available_index],
first_available_index,
tracks,
time_spans,
));
}
Some(build_new_track_result(
track_type,
get_highest_insert_index_for_track(tracks, track_type),
None,
))
}
PlacementStrategy::AlwaysNew { position } => Some(resolve_always_new_track(
tracks,
track_type,
*position,
)),
}
}
|
