139 lines
4.2 KiB
Rust
139 lines
4.2 KiB
Rust
use {
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r3vi::{
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view::{
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Observer, ObserverBroadcast, ObserverExt, OuterViewPort, View, ViewPort,
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singleton::*,
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sequence::*,
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},
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projection::projection_helper::*
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},
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crate::{
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editors::list::{ListCursor, ListCursorMode},
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edit_tree::{EditTree}
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},
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std::sync::Arc,
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std::sync::RwLock,
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};
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pub enum ListSegment {
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InsertCursor,
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Item {
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editor: EditTree,
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cur_dist: isize,
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}
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}
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pub struct ListSegmentSequence {
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data: Arc<dyn SequenceView<Item = EditTree>>,
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cursor: Arc<dyn SingletonView<Item = ListCursor>>,
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cur_cursor: ListCursor,
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port: ViewPort<dyn SequenceView<Item = ListSegment>>,
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cast: Arc<RwLock<ObserverBroadcast<dyn SequenceView<Item = ListSegment>>>>,
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proj_helper: ProjectionHelper<usize, Self>,
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}
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impl View for ListSegmentSequence {
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type Msg = usize;
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}
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impl SequenceView for ListSegmentSequence {
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type Item = ListSegment;
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fn len(&self) -> Option<usize> {
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match self.cur_cursor.mode {
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ListCursorMode::Insert => {
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Some(self.data.len()? + if self.cur_cursor.idx.is_some() { 1 } else { 0 })
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}
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_ => self.data.len(),
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}
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}
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fn get(&self, idx: &usize) -> Option<Self::Item> {
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let c = self.cursor.get();
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Some(if let Some(cur) = c.idx {
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match c.mode {
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ListCursorMode::Select => {
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ListSegment::Item {
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editor: self.data.get(idx)?,
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cur_dist: cur - *idx as isize
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}
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}
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ListCursorMode::Insert => {
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if *idx < cur as usize {
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ListSegment::Item {
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editor: self.data.get(idx)?,
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cur_dist: cur - *idx as isize
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}
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} else if *idx == cur as usize {
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ListSegment::InsertCursor
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} else {
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ListSegment::Item {
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editor: self.data.get(&(*idx - 1))?,
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cur_dist: cur - *idx as isize
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}
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}
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}
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}
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} else {
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ListSegment::Item {
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editor: self.data.get(&idx)?,
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cur_dist: *idx as isize + 1
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}
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})
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}
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}
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impl ListSegmentSequence {
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pub fn new(
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cursor_port: OuterViewPort<dyn SingletonView<Item = ListCursor>>,
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data_port: OuterViewPort<dyn SequenceView<Item = EditTree>>,
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) -> Arc<RwLock<Self>> {
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let out_port = ViewPort::new();
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let mut proj_helper = ProjectionHelper::new(out_port.update_hooks.clone());
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let proj = Arc::new(RwLock::new(ListSegmentSequence {
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cur_cursor: cursor_port.get_view().get(),
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port: out_port.clone(),
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cursor: proj_helper.new_singleton_arg(0, cursor_port, |s: &mut Self, _msg| {
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let _old_cursor = s.cur_cursor;
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s.cur_cursor = s.cursor.get();
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// todo: optimize
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s.cast.notify_each(0..=s.data.len().unwrap_or(0) + 1);
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}),
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data: proj_helper.new_sequence_arg(1, data_port, |s: &mut Self, idx| {
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if let Some(cur_idx) = s.cur_cursor.idx {
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match s.cur_cursor.mode {
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ListCursorMode::Insert => {
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if *idx < cur_idx as usize {
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s.cast.notify(idx);
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} else {
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s.cast.notify(&(*idx + 1));
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}
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}
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_ => {
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s.cast.notify(idx);
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}
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}
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} else {
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s.cast.notify(idx);
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}
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}),
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cast: out_port.inner().get_broadcast(),
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proj_helper,
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}));
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proj.write().unwrap().proj_helper.set_proj(&proj);
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out_port.inner().set_view(Some(proj.clone()));
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proj
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}
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pub fn get_view(&self) -> OuterViewPort<dyn SequenceView<Item = ListSegment>> {
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self.port.outer()
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}
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}
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