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use std::collections::BTreeSet;
use re_chunk::{LatestAtQuery, TimeInt};
use re_entity_db::EntityDb;
use re_log_types::ResolvedTimeRange;
use crate::blueprint_timeline;
/// Max number of undo points.
///
/// TODO(emilk): decide based on how much memory the blueprint uses instead.
const MAX_UNDOS: usize = 100;
/// We store the entire edit history of a blueprint in its store.
///
/// When undoing, we move back time, and redoing move it forward.
/// When editing, we first drop all data after the current time.
#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
pub struct BlueprintUndoState {
/// The current blueprint time, used for latest-at.
///
/// Everything _after_ this time is in "redo-space",
/// and will be dropped before new events are appended to the timeline.
///
/// If `None`, use the max time of the blueprint timeline.
current_time: Option<TimeInt>,
/// Interesting times to undo/redo to.
///
/// When the user drags a slider or similar, we get new events
/// recorded on each frame. The user presumably wants to undo the whole
/// slider drag, and not each increment of it.
///
/// So we use a heuristic to estimate when such interactions start/stop,
/// and add them to this set.
inflection_points: BTreeSet<TimeInt>,
}
impl BlueprintUndoState {
/// Default latest-at query
#[inline]
pub fn default_query() -> LatestAtQuery {
LatestAtQuery::latest(blueprint_timeline())
}
/// How far back in time can we undo?
pub fn oldest_undo_point(&self) -> Option<TimeInt> {
self.inflection_points.first().copied()
}
pub fn blueprint_query(&self) -> LatestAtQuery {
if let Some(time) = self.current_time {
LatestAtQuery::new(blueprint_timeline(), time)
} else {
Self::default_query()
}
}
/// If set, everything after this time is in "redo-space" (futurum).
/// If `None`, there is no undo-buffer.
pub fn redo_time(&self) -> Option<TimeInt> {
self.current_time
}
pub fn set_redo_time(&mut self, time: TimeInt) {
self.current_time = Some(time);
}
pub fn undo(&mut self, blueprint_db: &EntityDb) {
let time = self
.current_time
.unwrap_or_else(|| max_blueprint_time(blueprint_db));
if let Some(previous) = self.inflection_points.range(..time).next_back().copied() {
re_log::trace!("Undo");
self.current_time = Some(previous);
} else {
// nothing to undo to
re_log::debug!("Nothing to undo");
}
}
pub fn redo(&mut self) {
if let Some(time) = self.current_time {
re_log::trace!("Redo");
self.current_time = self.inflection_points.range(time.inc()..).next().copied();
} else {
// If we have no time, we're at latest, and have nothing to redo
re_log::debug!("Nothing to redo");
}
}
pub fn redo_all(&mut self) {
self.current_time = None;
}
/// After calling this, there is no way to redo what was once undone.
pub fn clear_redo_buffer(&mut self, blueprint_db: &mut EntityDb) {
re_tracing::profile_function!();
if let Some(last_kept_event_time) = self.current_time.take() {
let first_dropped_event_time =
TimeInt::new_temporal(last_kept_event_time.as_i64().saturating_add(1));
// Drop everything after the current timeline time
let events = blueprint_db.drop_time_range(
&blueprint_timeline(),
ResolvedTimeRange::new(first_dropped_event_time, re_chunk::TimeInt::MAX),
);
re_log::trace!("{} chunks affected when clearing redo buffer", events.len());
}
}
// Call each frame
pub fn update(&mut self, egui_ctx: &egui::Context, blueprint_db: &EntityDb) {
if is_interacting(egui_ctx) {
return;
}
// Nothing is happening - remember this as a time to undo to.
let time = max_blueprint_time(blueprint_db);
let inserted = self.inflection_points.insert(time);
if inserted {
re_log::trace!("Inserted new inflection point at {time:?}");
}
// TODO(emilk): we should _also_ look for long streaks of changes (changes every frame)
// and disregard those, in case we miss something in `is_interacting`.
// Note that this on its own won't enough though - if you drag a slider,
// then you don't want an undo-point each time you pause the mouse - only on mouse-up!
// Don't store too many undo-points:
while let Some(first) = self.inflection_points.first().copied() {
if MAX_UNDOS < self.inflection_points.len() {
self.inflection_points.remove(&first);
} else {
break;
}
}
}
}
fn max_blueprint_time(blueprint_db: &EntityDb) -> TimeInt {
blueprint_db
.time_histogram(&blueprint_timeline())
.and_then(|times| times.max_key())
.map_or(TimeInt::ZERO, TimeInt::new_temporal)
}
fn is_interacting(egui_ctx: &egui::Context) -> bool {
egui_ctx.input(|i| {
let is_scrolling = i.smooth_scroll_delta != egui::Vec2::ZERO;
let is_zooming = i.zoom_delta_2d() != egui::Vec2::splat(1.0);
i.pointer.any_down()
|| i.any_touches()
|| is_scrolling
|| !i.keys_down.is_empty()
|| is_zooming
})
}