196 lines
6.8 KiB
Rust
196 lines
6.8 KiB
Rust
//! Selection state (objects and, for direct selection, individual anchors; ruler guides).
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use std::collections::{BTreeMap, BTreeSet};
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use serde::{Deserialize, Serialize};
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use crate::{Document, NodeId};
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/// (subpath index, anchor index) inside a path.
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pub type AnchorRef = (usize, usize);
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#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
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pub struct Selection {
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/// Selected objects in selection order.
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pub objects: Vec<NodeId>,
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/// Direct-selected anchors per path. A path in `objects` with no entry here is fully selected.
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#[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
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pub anchors: BTreeMap<NodeId, BTreeSet<AnchorRef>>,
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/// Key object for Align.
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#[serde(default, skip_serializing_if = "Option::is_none")]
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pub key: Option<NodeId>,
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/// The object, group or layer targeted through its target circle in the Layers panel, which
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/// appearance, transparency and opacity-mask commands then act on (a targeted layer has its
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/// art selected). Any other selection change clears it.
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#[serde(default, skip_serializing_if = "Option::is_none")]
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pub target: Option<NodeId>,
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/// Slices selected with the Slice Selection tool: user slice ids and the ids of objects whose
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/// object slice is selected (see [`crate::slices`]). Any change to the object selection
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/// clears them.
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#[serde(default, skip_serializing_if = "Vec::is_empty")]
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pub slices: Vec<NodeId>,
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/// Ruler guides selected with a selection tool, as indexes into [`Document::guides`]. They are
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/// selected on their own: any change to the object selection clears them.
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#[serde(default, skip_serializing_if = "Vec::is_empty")]
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pub guides: Vec<usize>,
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}
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impl Selection {
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pub fn is_empty(&self) -> bool {
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self.objects.is_empty()
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}
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/// Is anything selected that Delete and the arrow keys act on: objects or ruler guides?
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pub fn has_objects_or_guides(&self) -> bool {
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!self.objects.is_empty() || !self.guides.is_empty()
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}
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pub fn len(&self) -> usize {
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self.objects.len()
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}
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pub fn contains(&self, id: NodeId) -> bool {
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self.objects.contains(&id)
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}
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pub fn clear(&mut self) {
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self.objects.clear();
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self.anchors.clear();
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self.key = None;
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self.target = None;
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self.slices.clear();
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self.guides.clear();
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}
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pub fn set(&mut self, ids: impl IntoIterator<Item = NodeId>) {
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self.clear();
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for id in ids {
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self.add(id);
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}
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}
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pub fn add(&mut self, id: NodeId) {
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self.target = None;
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self.slices.clear();
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self.guides.clear();
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if !self.objects.contains(&id) {
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self.objects.push(id);
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}
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}
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pub fn remove(&mut self, id: NodeId) {
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self.target = None;
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self.slices.clear();
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self.guides.clear();
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self.objects.retain(|x| *x != id);
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self.anchors.remove(&id);
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if self.key == Some(id) {
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self.key = None;
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}
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}
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/// Select slices `ids` (see [`Selection::slices`]) and nothing else.
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pub fn set_slices(&mut self, ids: impl IntoIterator<Item = NodeId>) {
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self.clear();
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for id in ids {
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if !self.slices.contains(&id) {
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self.slices.push(id);
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}
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}
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}
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/// Select ruler guides `indexes` (see [`Selection::guides`]) and nothing else.
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pub fn set_guides(&mut self, indexes: impl IntoIterator<Item = usize>) {
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self.clear();
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for i in indexes {
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if !self.guides.contains(&i) {
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self.guides.push(i);
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}
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}
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}
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pub fn toggle(&mut self, id: NodeId) {
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if self.contains(id) { self.remove(id) } else { self.add(id) }
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}
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/// Are some (not all) anchors of `id` direct-selected?
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pub fn partial(&self, id: NodeId) -> Option<&BTreeSet<AnchorRef>> {
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self.anchors.get(&id)
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}
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/// Drop ids that no longer exist or are no longer editable.
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pub fn prune(&mut self, doc: &Document) {
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self.objects.retain(|id| doc.node(*id).is_some());
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self.anchors.retain(|id, _| doc.node(*id).is_some());
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if self.key.is_some_and(|k| doc.node(k).is_none()) {
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self.key = None;
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}
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if self.target.is_some_and(|t| doc.node(t).is_none()) {
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self.target = None;
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}
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self.slices.retain(|id| doc.is_slice(*id));
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self.guides.retain(|i| *i < doc.guides.len());
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}
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/// Target `id` (see [`Selection::target`]): a layer gets its visible, unlocked art selected
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/// (the art of its sublayers too), anything else is selected itself.
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pub fn set_target(&mut self, doc: &Document, id: NodeId) {
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match doc.node(id) {
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Some(n) if n.is_layer() => self.set(n.layer_art(true)),
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_ => self.set([id]),
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}
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self.target = Some(id);
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}
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/// What appearance and transparency edits act on: the targeted object, group or layer, else
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/// the selected objects.
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pub fn subjects(&self) -> &[NodeId] {
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match &self.target {
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Some(t) => std::slice::from_ref(t),
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None => &self.objects,
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}
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}
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/// Top-level ordering: selected ids sorted by paint order (bottom first).
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pub fn in_paint_order(&self, doc: &Document) -> Vec<NodeId> {
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doc.paint_order(self.objects.iter().copied())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn basic_ops() {
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let mut s = Selection::default();
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s.add(NodeId(1));
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s.add(NodeId(1));
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s.toggle(NodeId(2));
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assert_eq!(s.objects, vec![NodeId(1), NodeId(2)]);
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s.toggle(NodeId(1));
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assert_eq!(s.objects, vec![NodeId(2)]);
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s.clear();
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assert!(s.is_empty());
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}
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#[test]
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fn guides_are_selected_on_their_own() {
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let mut s = Selection::default();
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s.add(NodeId(1));
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s.set_guides([2, 0, 2]);
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assert_eq!((s.objects.clone(), s.guides.clone()), (vec![], vec![2, 0]));
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assert!(s.has_objects_or_guides() && s.is_empty());
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s.add(NodeId(1));
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assert!(s.guides.is_empty());
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// Pruning drops guides the document no longer has.
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let mut d = Document::new(100.0, 100.0);
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d.guides.push(crate::Guide::new(true, 10.0));
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s.set_guides([0, 1]);
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s.prune(&d);
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assert_eq!(s.guides, vec![0]);
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}
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#[test]
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fn selection_changes_clear_the_target() {
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let mut s = Selection::default();
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s.set([NodeId(2), NodeId(3)]);
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s.target = Some(NodeId(1));
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assert_eq!(s.subjects(), &[NodeId(1)]);
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s.add(NodeId(4));
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assert_eq!(s.target, None);
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assert_eq!(s.subjects(), &[NodeId(2), NodeId(3), NodeId(4)]);
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s.target = Some(NodeId(1));
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s.remove(NodeId(2));
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assert_eq!(s.target, None);
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s.target = Some(NodeId(1));
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s.set([NodeId(3)]);
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assert_eq!(s.target, None);
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}
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}
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