349 lines
13 KiB
Rust
349 lines
13 KiB
Rust
//! One open PDF: its pages, tiles, text and picks (PDF-01).
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use std::{
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collections::{BTreeSet, HashMap, HashSet, VecDeque},
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io,
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sync::{Arc, Mutex},
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};
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use ely_pdf_engine::{Bookmark, Char, Doc, Worker};
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use gpui::{
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Context, EventEmitter, FocusHandle, InteractiveElement as _, IntoElement, ParentElement as _,
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Render, RenderImage, ScrollHandle, Styled as _, Window, div,
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};
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use crate::engine::{Loaded, MEASURE, Mupdf};
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use crate::layout::{Mode, Zoom};
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use crate::pages::{TileKey, rect_on};
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use crate::select::Selection;
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/// A failure to show; the window toasts it.
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pub struct Failed(pub String);
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/// The document changed what it shows.
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pub struct Reported;
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pub struct PdfView {
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worker: Arc<Mutex<Mupdf>>,
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pub doc: Doc,
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/// Page sizes in points; unmeasured ones copy the first.
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pub sizes: Vec<(f32, f32)>,
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pub mode: Mode,
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pub zoom: Zoom,
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pub rotate: i32,
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/// The page at the top, or the one shown.
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pub current: usize,
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pub scroll: ScrollHandle,
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pub tiles: HashMap<TileKey, Arc<RenderImage>>,
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/// Images no longer drawn, freed at the next render.
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pub retired: ely_gpui_component::primitives::Retired,
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/// Tile pixels painted; the first paint is logged (PERF-05).
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pub painted: f64,
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/// Tiles the worker could not draw; not asked again.
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pub failed: HashSet<TileKey>,
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/// Old tiles shown under their page until covered.
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pub backdrop: Vec<crate::backdrop::Old>,
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pub text: HashMap<usize, Arc<Vec<Char>>>,
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pub asking_text: HashSet<usize>,
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pub marks: Vec<Bookmark>,
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pub selection: Option<Selection>,
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/// Found words by page, each with its quads.
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pub found: Vec<(usize, Vec<[f32; 8]>)>,
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/// The found word chosen.
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pub chosen: Option<usize>,
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/// Where to scroll once laid out, (x, y) content pixels.
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pub go_to: Option<(f32, f32)>,
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/// A tile is on its way from the worker.
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pub painting: bool,
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/// The view's size and place, as last painted.
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pub room: gpui::Bounds<gpui::Pixels>,
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pub focus: FocusHandle,
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/// Counts edits; replies from before one are dropped.
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pub version: u64,
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/// Edits landed so far.
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pub edited: u64,
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/// Edits waiting their turn, and whether one runs.
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pub queue: VecDeque<crate::edits::Queued>,
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pub editing: bool,
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/// History marks: now, and at the last load or save.
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pub mark: String,
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pub saved: String,
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/// Page pictures for the side panel, by page and darkness.
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pub thumbs: HashMap<(usize, bool), Arc<RenderImage>>,
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pub thumbs_failed: HashSet<usize>,
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/// A picture is on its way from the worker.
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pub thumbing: bool,
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/// Pages picked in the side panel, and the anchor.
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pub picked: BTreeSet<usize>,
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pub anchor: Option<usize>,
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pub tool: crate::content::Tool,
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/// What pages hold, read while editing.
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pub layers: crate::content::Layers,
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pub reading_layer: bool,
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pub aim: Option<crate::content::Aim>,
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pub drag: Option<crate::content::Drag>,
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/// The gesture's page, its window origin and scale.
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pub grip: Option<(usize, gpui::Point<gpui::Pixels>, f32)>,
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/// The aim when a gesture began; the panel keeps it.
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pub held: Option<crate::content::Aim>,
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/// Annotations and fields by page, for every tool.
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pub notes: crate::annotate::Notes,
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pub reading_notes: bool,
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/// Links by page, read with the notes.
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pub links: HashMap<usize, Vec<ely_pdf_engine::Link>>,
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/// Every field name in the form, read for new fields.
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pub form_names: Option<Vec<String>>,
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pub reading_names: bool,
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/// The bookmark picked in the side panel, depth first.
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pub mark_pick: Option<usize>,
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/// Attachments, read when listed, and the one picked.
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pub files: Option<Vec<ely_pdf_engine::Attachment>>,
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pub reading_files: bool,
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pub file_pick: Option<String>,
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/// Regions marked to remove; never in the document.
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pub redactions: Vec<ely_pdf_engine::Region>,
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pub sketch: Option<crate::annotate::Sketch>,
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/// A pick to mark once its text is read.
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pub marking: Option<crate::select::Selection>,
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/// Where the last text pick was pressed, in the window.
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pub pressed: Option<gpui::Point<gpui::Pixels>>,
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/// What the document allows, `proto::may` bits.
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pub allowed: u32,
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/// The file read, and its checked signature fields.
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pub signatures: Option<(std::path::PathBuf, Vec<crate::sign::Checked>)>,
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pub reading_signatures: bool,
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pub sign_at: Option<crate::sign::SignAt>,
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/// A visible signature waiting for its place.
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pub stamp: Option<crate::visible::Stamp>,
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/// MuPDF's words, when it repaired the file.
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pub repair: Option<String>,
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/// A draw met damage; the tab hears once.
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pub damage_seen: bool,
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}
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/// Why a request was refused, by what it needs.
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pub fn restricted(needed: &str, cx: &gpui::App) -> gpui::SharedString {
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let what = ely_ui::i18n::text(cx, &format!("pdf.may.{needed}"), &[]);
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ely_ui::i18n::text(cx, "pdf.restricted", &[("what", &what)])
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}
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/// Page sizes in points; unmeasured pages copy the first.
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pub fn sizes(pages: usize, first: &[[f32; 4]]) -> Vec<(f32, f32)> {
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let size = |b: &[f32; 4]| (b[2] - b[0], b[3] - b[1]);
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let mut sizes = vec![size(&first[0]); pages];
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for (at, bounds) in first.iter().enumerate() {
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sizes[at] = size(bounds);
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}
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sizes
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}
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impl EventEmitter<Failed> for PdfView {}
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impl EventEmitter<Reported> for PdfView {}
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impl PdfView {
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/// All its images, for a closing tab to free.
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pub fn retire_all(&mut self) -> ely_gpui_component::primitives::Retired {
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let mut images = std::mem::take(&mut self.retired);
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let tiles = self.tiles.drain().map(|(_, image)| image);
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let old = self.backdrop.drain(..).map(|old| old.image);
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for image in tiles.chain(old).chain(self.thumbs.drain().map(|(_, image)| image)) {
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images.push(image);
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}
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images
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}
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pub fn new(worker: Arc<Mutex<Mupdf>>, loaded: Loaded, cx: &mut Context<Self>) -> Self {
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let sizes = sizes(loaded.pages, &loaded.first);
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log::info!("pdf: a view of {} pages", loaded.pages);
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let measured = loaded.first.len();
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let mut view = PdfView {
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worker,
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doc: loaded.doc,
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sizes,
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mode: Mode::Continuous,
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zoom: Zoom::Width,
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rotate: 0,
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current: 0,
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scroll: ScrollHandle::new(),
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tiles: HashMap::new(),
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retired: Default::default(),
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painted: 0.0,
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failed: HashSet::new(),
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backdrop: Vec::new(),
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text: HashMap::new(),
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asking_text: HashSet::new(),
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marks: loaded.marks,
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selection: None,
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found: Vec::new(),
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chosen: None,
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go_to: None,
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painting: false,
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room: gpui::Bounds::default(),
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focus: cx.focus_handle(),
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version: 0,
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edited: 0,
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queue: VecDeque::new(),
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editing: false,
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saved: loaded.mark.clone(),
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mark: loaded.mark,
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thumbs: HashMap::new(),
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thumbs_failed: HashSet::new(),
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thumbing: false,
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picked: BTreeSet::new(),
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anchor: None,
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tool: crate::content::Tool::Read,
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layers: HashMap::new(),
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reading_layer: false,
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aim: None,
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drag: None,
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held: None,
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grip: None,
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notes: HashMap::new(),
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reading_notes: false,
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links: HashMap::new(),
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form_names: None,
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reading_names: false,
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mark_pick: None,
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files: None,
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reading_files: false,
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file_pick: None,
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redactions: Vec::new(),
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sketch: None,
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marking: None,
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pressed: None,
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allowed: loaded.allowed,
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signatures: None,
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reading_signatures: false,
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sign_at: None,
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stamp: None,
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repair: loaded.repaired.clone(),
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damage_seen: false,
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};
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view.measure(measured, cx);
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view
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}
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/// Says `what` failed; the window shows it.
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pub fn fail(&self, what: &str, error: &io::Error, cx: &mut Context<Self>) {
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// Engine text may quote the document: the user sees it.
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log::error!("pdf: {what} failed ({:?})", error.kind());
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let text = match error.kind() {
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_ if ely_pdf_engine::is_stale(error) => ely_ui::i18n::text(cx, "pdf.object.changed", &[]),
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io::ErrorKind::PermissionDenied => restricted(&error.to_string(), cx),
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_ => ely_ui::i18n::text(cx, "pdf.failed", &[("what", what), ("error", &error.to_string())]),
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};
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cx.emit(Failed(text.to_string()));
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}
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/// Runs `work` off the window; edits between drop `then`.
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pub fn read<T: Send + 'static>(
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&self,
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work: impl FnOnce(&mut Worker) -> io::Result<T> + Send + 'static,
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then: impl FnOnce(&mut Self, io::Result<T>, &mut Context<Self>) + 'static,
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cx: &mut Context<Self>,
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) {
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let version = self.version;
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self.off(
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work,
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move |view, done, cx| match view.version == version {
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true => then(view, done, cx),
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false => log::info!("pdf: a read from before an edit is dropped"),
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},
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cx,
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);
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}
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/// Runs `work` off the window, then `then` here.
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pub fn off<T: Send + 'static>(
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&self,
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work: impl FnOnce(&mut Worker) -> io::Result<T> + Send + 'static,
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then: impl FnOnce(&mut Self, io::Result<T>, &mut Context<Self>) + 'static,
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cx: &mut Context<Self>,
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) {
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let worker = self.worker.clone();
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cx.spawn(async move |this, cx| {
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let done = cx
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.background_executor()
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.spawn(async move { work(worker.lock().expect("the worker lock").get()?) })
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.await;
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if this.update(cx, |view, cx| then(view, done, cx)).is_err() {
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log::info!("pdf: a reply outlived its view");
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}
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})
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.detach();
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}
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/// Measures the other pages, a batch at a time.
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pub fn measure(&mut self, from: usize, cx: &mut Context<Self>) {
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let (doc, count) = (self.doc, (self.sizes.len() - from).min(MEASURE));
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if count == 0 {
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return;
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}
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self.read(
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move |worker| worker.bounds(doc, from, count),
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move |view, read, cx| match read {
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Ok(boxes) => {
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for (at, b) in boxes.iter().enumerate() {
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view.sizes[from + at] = (b[2] - b[0], b[3] - b[1]);
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}
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cx.emit(Reported);
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cx.notify();
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view.measure(from + count, cx);
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}
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Err(error) => view.fail("page sizes", &error, cx),
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},
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cx,
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);
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}
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/// Scrolls `page` into view, `y` points near the top.
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pub fn show(&mut self, page: usize, y: f32, cx: &mut Context<Self>) {
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self.current = page;
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let laid = self.laid_out();
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if let Some(place) = laid.placed.iter().find(|place| place.page == page) {
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let (_, top, _, _) = rect_on([0.0, y, 0.0, y], self.sizes[page], self.rotate, laid.scale);
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// Across: stay unless the page's left is out of view.
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let (left, wide) = (-f32::from(self.scroll.offset().x), f32::from(self.room.size.width));
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let x = match place.x >= left && place.x < left + wide {
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true => left,
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false => (place.x - crate::layout::GAP).max(0.0),
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};
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self.go_to = Some((x, (place.y + top - crate::layout::GAP * 2.0).max(0.0)));
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}
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cx.notify();
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}
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/// Every page tile goes; images are freed next render.
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pub fn retire_tiles(&mut self) {
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for old in self.backdrop.drain(..) {
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self.retired.push(old.image);
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}
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for (_, image) in self.tiles.drain() {
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self.retired.push(image);
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}
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}
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/// Changes how pages show; the page read stays in view.
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pub fn change(&mut self, change: impl FnOnce(&mut Self, f32), cx: &mut Context<Self>) {
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let scale = self.laid_out().scale;
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change(self, scale);
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self.retire_tiles();
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self.show(self.current, 0.0, cx);
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}
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/// Moves `by` pages; continuous views scroll there.
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pub fn turn(&mut self, by: isize, cx: &mut Context<Self>) {
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let last = self.sizes.len().saturating_sub(1) as isize;
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let page = (self.current as isize + by).clamp(0, last) as usize;
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self.show(page, 0.0, cx);
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}
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}
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impl Render for PdfView {
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fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
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self.retired.release(window);
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let pages = self.page_view(window, cx);
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div().size_full().track_focus(&self.focus).child(pages)
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}
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}
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