10c83a1431
Three things the editor made you work around. Text was typed into a dialog and then placed, so you chose a size and a weight for words you could not see against the page they were going on. The click now opens a caret where you clicked, in the font, size and colour the words will have, with the style bar over it; double-clicking a stamp reopens it in place. Lining a CSS line box up with a PDF baseline is measured from the font's own metrics, not guessed. A signature lived in a single slot. There was nowhere to keep initials as well as a name, nowhere to change the one you had, and reaching for the tool again simply stamped the first one — which is the same fault three times: one slot. It is a library now, with redraw, rename and delete, and the choice is made when the tool is picked up, so placing stays one click. An existing single signature is carried into it rather than dropped. The mark you had just drawn could be resized by its handles and not moved by its middle, because only the select tool let marks be hit-tested at all. The SELECTED mark now takes a press whatever tool is armed. A press anywhere else still draws, and an unfilled shape is still grabbed by its outline — the same rule select has always followed. Also: words default to dark ink rather than highlighter yellow, which was unreadable on white and is now impossible to miss, since you watch yourself type it.
557 lines
23 KiB
JavaScript
557 lines
23 KiB
JavaScript
// Pointer behaviour for every tool.
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//
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// The editor is modal: one tool is armed, and what a drag does depends only on
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// which. The alternative — inferring intent from what is under the cursor — is
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// what makes PDF annotators infuriating, because a drag meant to draw a box
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// selects a paragraph instead. Modality is enforced in CSS (see the
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// body[data-mode] rules): with a drawing tool armed, the text and form layers
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// stop taking pointer events entirely, so a drag cannot be stolen.
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//
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// The text-markup tools are the deliberate exception. Highlight, underline and
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// strikeout all work BY selecting text — the text layer stays live, the browser
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// does the selection, and on release we convert the selection's client rects
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// into user space. Rebuilding text selection over pdf.js's span soup would be
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// worse at it.
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//
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// Placing something one-shot — a text stamp, a signature — drops straight back
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// to the select tool with the new mark selected. Staying armed means the next
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// click stamps a second copy, which is almost never what was wanted, and it
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// puts the thing just placed immediately within reach of a nudge or a resize.
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import { ASCENT, boundsOf, normBox, translatePatch, resizeBox, scaleToBox } from "./shape.js";
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const MIN_DRAG = 3; // CSS px before a press counts as a drag
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const DOUBLE_CLICK_MS = 450; // window for a second click on the same mark
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const SIG_WIDTH_PT = 170; // default placed width of a signature
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const DESCENDER = 0.26; // how far below the baseline a glyph can reach, as a fraction of size
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/** Tools that mark up existing text rather than drawing free-hand. */
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export const TEXT_MARKUP = new Set(["highlight", "underline", "strikeout"]);
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/** Tools that place something with a single click. */
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const STAMP_TOOLS = new Set(["text", "signature"]);
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/** Tools that act on a run of the document's OWN text. */
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const RUN_TOOLS = new Set(["edittext"]);
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export class Tools {
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constructor({ strip, model, host }) {
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this.strip = strip;
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this.model = model;
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// host (editor.js): { toast, onChange, selectTool, onSelectionChange,
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// beginText, editText, editRun, chooseSignature,
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// signature }
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this.host = host;
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this.tool = "select";
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this.color = "#ffd400";
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this.width = 2.5;
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this.fill = false; // shapes: outline only, or filled
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this.fillOpacity = 0.25;
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this.selected = null;
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this.drag = null;
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// Opening a second document builds a second Tools over the same container.
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// Without a way to unbind, the first one stays subscribed, keeps pointing
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// at a torn-down strip, and throws on the next click — so every listener
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// goes on one signal and destroy() drops the lot.
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this._abort = new AbortController();
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const opts = { signal: this._abort.signal };
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const c = strip.container;
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c.addEventListener("pointerdown", (e) => this.onDown(e), opts);
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c.addEventListener("pointermove", (e) => this.onMove(e), opts);
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window.addEventListener("pointerup", (e) => this.onUp(e), opts);
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}
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destroy() {
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this._abort.abort();
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this.drag = null;
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this.selected = null;
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}
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get mode() {
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if (this.tool === "select") return "select";
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if (TEXT_MARKUP.has(this.tool)) return "highlight";
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if (RUN_TOOLS.has(this.tool)) return "pickrun";
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if (STAMP_TOOLS.has(this.tool)) return "stamp";
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return "draw";
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}
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setTool(t) {
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this.tool = t;
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this._setSelected(null);
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document.body.dataset.mode = this.mode;
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this.host.onChange?.();
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}
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/** The one place selection changes, so the host never misses one. */
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_setSelected(id) {
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this.selected = id;
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this.strip.refreshAllOverlays(id);
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this.host.onSelectionChange?.(id);
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}
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select(id) { this._setSelected(id); }
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setColor(c) {
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this.color = c;
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const a = this.model.annot(this.selected);
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if (a && a.kind !== "redact") this.patchSelected({ color: c });
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}
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setFill(on) {
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this.fill = !!on;
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const a = this.model.annot(this.selected);
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if (a && (a.kind === "rect" || a.kind === "ellipse")) this.patchSelected({ fill: this.fill });
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}
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setWidth(w) {
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this.width = w;
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const a = this.model.annot(this.selected);
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if (a && a.kind !== "text" && a.kind !== "redact") this.patchSelected({ width: w });
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}
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/** Change the selected mark, as one undo step. */
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patchSelected(patch) {
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if (!this.selected) return false;
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const ok = this.model.moveAnnot(this.selected, patch);
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this.strip.refreshAllOverlays(this.selected);
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this.host.onSelectionChange?.(this.selected);
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this.host.onChange?.();
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return ok;
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}
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deleteSelected() {
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if (!this.selected) return false;
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const ok = this.model.removeAnnot(this.selected);
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this._setSelected(null);
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this.host.onChange?.();
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return ok;
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}
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/** Drop a copy of the selected mark, offset so it is visibly a second one. */
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duplicateSelected() {
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const a = this.model.annot(this.selected);
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if (!a) return null;
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const off = 12;
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const copy = { ...structuredClone(a), ...translatePatch(a, off, -off) };
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delete copy.id;
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delete copy._w;
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const made = this.model.addAnnot(copy);
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this._setSelected(made.id);
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this.host.onChange?.();
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return made;
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}
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// ---- pointer ------------------------------------------------------
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onDown(e) {
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if (e.button !== 0) return;
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// A resize handle is checked before anything else, and whatever tool is
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// armed. Two reasons it comes first: it sits outside the mark's own
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// bounds, so the page under it may not even be the page the mark is on;
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// and a shape is selected the instant it is drawn, so grabbing a corner
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// has to work right then, without a detour through the select tool to
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// resize the thing you are still looking at.
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//
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// It cannot be confused with drawing. A handle is a 9 px square that
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// exists only while something is selected; nobody aims at one by
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// accident, and Escape drops the selection if the space is wanted back.
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const handle = e.target?.closest?.(".handle")?.dataset?.handle;
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if (handle && this.selected) {
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const a = this.model.annot(this.selected);
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const ov = a && this.strip.overlayFor(a.page);
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if (a && ov?.viewport) {
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const view = this.strip.views.get(a.page);
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const r = view.pv.div.getBoundingClientRect();
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const [hx, hy] = ov.toPdf(e.clientX - r.left, e.clientY - r.top);
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this.drag = {
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kind: "resize", uid: a.page, id: a.id, handle,
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x0: hx, y0: hy, orig: structuredClone(a), from: boundsOf(a),
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cx: e.clientX, cy: e.clientY, moved: false,
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};
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e.preventDefault();
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return;
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}
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}
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// Dragging what is already selected moves it, whatever tool is armed.
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// A tool drops back to select after it stamps, but a shape tool stays
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// armed for the next shape — so the mark you just drew could be resized
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// by its handles and not moved by its middle, which is a strange half of
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// an editor. Only the SELECTED mark does this: a press anywhere else
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// still draws.
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if (this.selected && this.tool !== "select" &&
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e.target?.closest?.(".mark")?.dataset?.id === this.selected) {
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const a = this.model.annot(this.selected);
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const spot = this.strip.pageAt(e.clientX, e.clientY);
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const ovm = a && this.strip.overlayFor(a.page);
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if (a && spot && spot.uid === a.page && ovm?.viewport) {
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const [mx, my] = ovm.toPdf(spot.vx, spot.vy);
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this.drag = { kind: "move", uid: a.page, id: a.id, x0: mx, y0: my,
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orig: structuredClone(a), cx: e.clientX, cy: e.clientY, moved: false };
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e.preventDefault();
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return;
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}
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}
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const hit = this.strip.pageAt(e.clientX, e.clientY);
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if (!hit) return;
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const ov = this.strip.overlayFor(hit.uid);
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if (!ov || !ov.viewport) return;
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if (TEXT_MARKUP.has(this.tool)) return; // let the browser select text
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// Editing the document's own text: the click has to land on a run of it,
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// which is exactly what a text-layer span is. Anywhere else is a miss, and
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// saying so beats silently doing nothing.
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if (this.tool === "edittext") {
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e.preventDefault();
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const span = e.target?.closest?.(".textLayer span");
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if (!span || !span.textContent.trim()) {
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this.host.toast?.("Click on a line of the document's text to replace it.", true);
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return;
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}
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const run = this.describeRun(span, hit.uid);
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if (run) this.host.editRun?.(run);
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return;
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}
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const [x, y] = ov.toPdf(hit.vx, hit.vy);
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if (this.tool === "select") {
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const id = e.target?.closest?.(".mark")?.dataset?.id || null;
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// Double-click is detected here rather than from a `dblclick` listener.
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// Selecting a mark calls preventDefault() on the pointerdown, and that
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// suppresses the compatibility mouse events the browser would otherwise
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// synthesise a dblclick from — so the native event never arrives.
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const now = Date.now();
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const double = !!id && this._lastClick?.id === id && now - this._lastClick.t < DOUBLE_CLICK_MS;
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this._lastClick = id ? { id, t: now } : null;
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this._setSelected(id);
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if (!id) return;
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e.preventDefault();
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if (double) {
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const a = this.model.annot(id);
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// A stamp is edited where it sits; a replaced run keeps its dialog,
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// which is where it explains what it is replacing.
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if (a?.kind === "text") { this.host.beginText?.({ id }); return; }
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if (a?.kind === "textedit") { this.host.editText?.(id, null); return; }
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}
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this.drag = { kind: "move", uid: hit.uid, id, x0: x, y0: y,
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orig: structuredClone(this.model.annot(id)), cx: e.clientX, cy: e.clientY, moved: false };
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return;
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}
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if (this.tool === "text") {
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// A caret on the page, not a dialog about the page.
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this.host.beginText?.({ uid: hit.uid, x, y });
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e.preventDefault();
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return;
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}
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if (this.tool === "signature") {
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this._placeSignature(hit.uid, x, y);
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e.preventDefault();
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return;
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}
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// Drawing tools: start a drag with a live preview.
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this.drag = { kind: this.tool, uid: hit.uid, x0: x, y0: y, x, y,
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pts: this.tool === "pen" ? [[x, y]] : null,
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cx: e.clientX, cy: e.clientY, moved: false };
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e.preventDefault();
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}
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onMove(e) {
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const d = this.drag;
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if (!d) return;
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const ov = this.strip.overlayFor(d.uid);
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if (!ov || !ov.viewport) return;
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const view = this.strip.views.get(d.uid);
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if (!view) { this.drag = null; return; }
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const rect = view.pv.div.getBoundingClientRect();
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// A drag that wanders off the page stays on it. Marks outside the page
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// box are invisible in any PDF reader, so letting one be drawn there
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// would only produce something that disappears on save.
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const cx = Math.min(Math.max(e.clientX, rect.left), rect.right);
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const cy = Math.min(Math.max(e.clientY, rect.top), rect.bottom);
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const [x, y] = ov.toPdf(cx - rect.left, cy - rect.top);
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d.x = x; d.y = y;
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if (!d.moved && Math.hypot(e.clientX - (d.cx ?? e.clientX), e.clientY - (d.cy ?? e.clientY)) > MIN_DRAG) d.moved = true;
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if (d.kind === "move") {
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const a = this.model.annot(d.id);
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if (!a) return;
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// Live and un-journalled; the whole gesture is committed once on release
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// so undo steps back over the drag, not over each mouse move.
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Object.assign(a, translatePatch(d.orig, x - d.x0, y - d.y0));
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d.moved = true;
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this.strip.refreshOverlay(d.uid, d.id);
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return;
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}
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if (d.kind === "resize") {
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const a = this.model.annot(d.id);
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if (!a) return;
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// Always mapped from the ORIGINAL geometry, never from the last frame,
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// so a drag back to where it started restores the mark exactly.
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if (d.handle === "p1" || d.handle === "p2") {
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Object.assign(a, d.handle === "p1" ? { x1: x, y1: y } : { x2: x, y2: y });
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} else {
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const uniform = d.orig.kind === "text" || d.orig.kind === "signature";
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const to = resizeBox(d.from, d.handle, x - d.x0, y - d.y0, { uniform });
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Object.assign(a, scaleToBox(d.orig, d.from, to));
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}
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d.moved = true;
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this.strip.refreshOverlay(d.uid, d.id);
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return;
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}
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if (d.kind === "pen") { d.pts.push([x, y]); }
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this.strip.setPreview(d.uid, this._previewAnnot(d));
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}
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onUp(e) {
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// A handle or move drag is finished here whatever tool is armed. Without
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// this the
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// text-markup tools would return on the line below and strand a resize
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// half-done: applied to the live mark, never journalled, and with
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// this.drag still set so the next press behaves oddly.
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const inFlight = this.drag;
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const live = inFlight && (inFlight.kind === "resize" || inFlight.kind === "move");
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if (!live && TEXT_MARKUP.has(this.tool)) {
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this._commitTextMarkup();
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return;
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}
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const d = inFlight;
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this.drag = null;
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if (!d) return;
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this.strip.setPreview(null, null);
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if (d.kind === "move" || d.kind === "resize") {
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const a = this.model.annot(d.id);
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if (!a || !d.moved) { this.strip.refreshOverlay(d.uid, this.selected); return; }
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this._commitLiveEdit(a, d.orig);
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this._setSelected(d.id);
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this.host.onChange?.();
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return;
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}
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const a = this._previewAnnot(d, true);
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if (a) {
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const made = this.model.addAnnot(a);
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this._setSelected(made.id);
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} else {
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this.strip.refreshAllOverlays(this.selected);
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}
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this.host.onChange?.();
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}
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// A live drag mutates the mark in place so the screen keeps up. To land it
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// on the undo stack as ONE step, put the original back and re-apply the
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// result through the model.
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_commitLiveEdit(a, orig) {
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const after = structuredClone(a);
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Object.assign(a, orig);
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const patch = {};
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for (const k of Object.keys(after)) {
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if (k !== "id" && k !== "page" && k !== "kind") patch[k] = after[k];
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}
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this.model.moveAnnot(a.id, patch);
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}
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// The mark a drag currently describes. `final` rejects degenerate ones so a
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// stray click does not leave an invisible zero-size rectangle behind.
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_previewAnnot(d, final = false) {
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const common = { page: d.uid, color: this.color, width: this.width };
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switch (d.kind) {
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case "pen": {
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if (final && d.pts.length < 2) return null;
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return { kind: "pen", ...common, pts: d.pts.slice() };
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}
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case "arrow": case "line": {
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if (final && !d.moved) return null;
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return { kind: d.kind, ...common, x1: d.x0, y1: d.y0, x2: d.x, y2: d.y };
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}
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case "rect": case "ellipse": case "redact": {
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const b = normBox(d.x0, d.y0, d.x, d.y);
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if (final && (b.w < 2 || b.h < 2)) return null;
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if (d.kind === "redact") return { kind: "redact", page: d.uid, ...b };
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return { kind: d.kind, ...common, ...b, fill: !!this.fill, opacity: this.fillOpacity ?? 0.25 };
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}
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default: return null;
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}
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}
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/**
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* Everything needed to replace one run of the document's text, in the
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* coordinates the rest of the editor speaks.
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*
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* The text layer is the source: pdf.js has already placed a span over every
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* run, and its `--font-height` carries the run's size in unscaled PDF points
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* — so the size survives zooming, which reading it off the rendered box
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* would not.
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*/
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describeRun(span, uid) {
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const ov = this.strip.overlayFor(uid);
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const view = this.strip.views.get(uid);
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if (!ov?.viewport || !view) return null;
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const pr = view.pv.div.getBoundingClientRect();
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const r = span.getBoundingClientRect();
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if (r.width < 1 || r.height < 1) return null;
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const [ax, ay] = ov.toPdf(r.left - pr.left, r.bottom - pr.top);
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const [bx, by] = ov.toPdf(r.right - pr.left, r.top - pr.top);
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const box = normBox(ax, ay, bx, by);
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const declared = parseFloat(getComputedStyle(span).getPropertyValue("--font-height"));
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const size = Number.isFinite(declared) && declared > 0 ? declared : box.h * 0.8;
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// PDF text sits on a baseline; the span's top is the top of the em box,
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// so the baseline hangs one ascent below it.
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const baseline = box.y + box.h - size * ASCENT;
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// The span does NOT enclose the glyphs. pdf.js sizes it to the em box, so
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// every descender — the tail of a y, a comma — falls below it, and a cover
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// cut to the span leaves a row of little hooks showing under the
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// replacement. Reach below the baseline far enough to take them, and a
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// hair above and to the sides for accents and side bearings.
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const bottom = Math.min(box.y, baseline - size * DESCENDER);
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const top = box.y + box.h + size * 0.06;
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return {
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uid,
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text: span.textContent,
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box: { x: box.x - 0.6, y: bottom, w: box.w + 1.2, h: top - bottom },
|
|
size,
|
|
baseline,
|
|
clientRect: { left: r.left, top: r.top, width: r.width, height: r.height },
|
|
};
|
|
}
|
|
|
|
/** Commit a replaced run as a mark, selected and ready to nudge. */
|
|
replaceRun(run, props) {
|
|
const a = this.model.addAnnot({
|
|
kind: "textedit", page: run.uid,
|
|
x: run.box.x, y: run.box.y, w: run.box.w, h: run.box.h,
|
|
baseline: run.baseline,
|
|
text: props.text, size: props.size ?? run.size,
|
|
color: props.color || "#000000",
|
|
cover: props.cover || "#ffffff",
|
|
bold: !!props.bold, italic: !!props.italic,
|
|
});
|
|
this._afterStamp(a);
|
|
return a;
|
|
}
|
|
|
|
// ---- text markup --------------------------------------------------
|
|
// Take the live selection's client rects, drop them onto whichever page each
|
|
// one sits on, and convert to user space. A selection spanning a page break
|
|
// therefore produces one mark per page, which is also what the PDF format
|
|
// wants. Highlight, underline and strikeout differ only in `kind`.
|
|
_commitTextMarkup() {
|
|
const kind = this.tool;
|
|
const sel = window.getSelection();
|
|
if (!sel || sel.isCollapsed || sel.rangeCount === 0) return;
|
|
const byPage = new Map();
|
|
for (let i = 0; i < sel.rangeCount; i++) {
|
|
for (const cr of sel.getRangeAt(i).getClientRects()) {
|
|
if (cr.width < 0.5 || cr.height < 0.5) continue;
|
|
const hit = this.strip.pageAt(cr.left + cr.width / 2, cr.top + cr.height / 2);
|
|
if (!hit) continue;
|
|
const ov = this.strip.overlayFor(hit.uid);
|
|
if (!ov || !ov.viewport) continue;
|
|
const r = this.strip.views.get(hit.uid).pv.div.getBoundingClientRect();
|
|
const [ax, ay] = ov.toPdf(cr.left - r.left, cr.top - r.top);
|
|
const [bx, by] = ov.toPdf(cr.right - r.left, cr.bottom - r.top);
|
|
const box = normBox(ax, ay, bx, by);
|
|
if (box.w < 0.5 || box.h < 0.5) continue;
|
|
if (!byPage.has(hit.uid)) byPage.set(hit.uid, []);
|
|
byPage.get(hit.uid).push(box);
|
|
}
|
|
}
|
|
if (!byPage.size) return;
|
|
let last = null;
|
|
for (const [uid, rects] of byPage) {
|
|
last = this.model.addAnnot({
|
|
kind, page: uid, color: this.color,
|
|
opacity: kind === "highlight" ? 0.38 : 1,
|
|
width: kind === "highlight" ? undefined : Math.max(0.8, this.width * 0.55),
|
|
rects: mergeRows(rects),
|
|
});
|
|
}
|
|
sel.removeAllRanges();
|
|
this._setSelected(last ? last.id : null);
|
|
this.host.onChange?.();
|
|
}
|
|
|
|
// ---- stamps -------------------------------------------------------
|
|
/** Place a new text mark, or rewrite an existing one, as one undo step. */
|
|
/**
|
|
* The colour to write WORDS in.
|
|
*
|
|
* The palette's default is highlighter yellow, which is right for a
|
|
* highlight and unreadable as text on a white page. A signature already
|
|
* made this swap; text was left behind, and you now watch yourself type
|
|
* in it, so it is impossible to miss.
|
|
*/
|
|
get ink() { return this.color === "#ffd400" ? "#1a1f2b" : this.color; }
|
|
|
|
placeText({ uid, x, y }, props) {
|
|
if (!String(props.text || "").trim()) return null;
|
|
const a = this.model.addAnnot({
|
|
kind: "text", page: uid, color: this.ink, x, y,
|
|
size: props.size, text: props.text, bold: !!props.bold, italic: !!props.italic,
|
|
});
|
|
this._afterStamp(a);
|
|
return a;
|
|
}
|
|
|
|
updateText(id, props) {
|
|
const a = this.model.annot(id);
|
|
if (!a) return null;
|
|
if (!String(props.text || "").trim()) { this.deleteSelected(); return null; }
|
|
this.model.moveAnnot(id, {
|
|
text: props.text, size: props.size, bold: !!props.bold, italic: !!props.italic,
|
|
});
|
|
delete a._w; // width changed; let the renderer re-measure
|
|
this._setSelected(id);
|
|
this.host.onChange?.();
|
|
return a;
|
|
}
|
|
|
|
async _placeSignature(uid, x, y) {
|
|
// Which signature is decided when the tool is armed, not on every click,
|
|
// so placing three initials in three boxes is three clicks. This is only
|
|
// the fallback for a tool armed with nothing chosen yet.
|
|
let sig = this.host.signature();
|
|
if (!sig) {
|
|
sig = await this.host.chooseSignature?.();
|
|
if (!sig) return;
|
|
}
|
|
const w = SIG_WIDTH_PT;
|
|
const h = w * (sig.aspect || 0.34);
|
|
const a = this.model.addAnnot({
|
|
kind: "signature", page: uid, color: this.ink,
|
|
width: 1.6, x, y: y - h, w, h, strokes: sig.strokes,
|
|
});
|
|
this._afterStamp(a);
|
|
}
|
|
|
|
// Drop back to select with the new mark live, so it can be nudged, resized
|
|
// or deleted straight away and a second click does not stamp a duplicate.
|
|
_afterStamp(a) {
|
|
this.host.selectTool?.("select");
|
|
this._setSelected(a.id);
|
|
this.host.onChange?.();
|
|
}
|
|
|
|
/** Bounds of the current selection, for the status line. */
|
|
selectedBounds() {
|
|
const a = this.model.annot(this.selected);
|
|
return a ? boundsOf(a) : null;
|
|
}
|
|
}
|
|
|
|
// Client rects for a text selection come one per text run, so a single
|
|
// highlighted line arrives as a dozen slivers. Merging the ones that share a
|
|
// baseline turns them back into one band per line — fewer objects in the saved
|
|
// file, and no seams where two slivers overlap at 38% opacity.
|
|
function mergeRows(rects) {
|
|
const rows = [];
|
|
for (const r of rects.slice().sort((a, b) => b.y - a.y || a.x - b.x)) {
|
|
const row = rows.find((q) => Math.abs((q.y + q.h / 2) - (r.y + r.h / 2)) < Math.min(q.h, r.h) * 0.5);
|
|
if (!row) { rows.push({ ...r }); continue; }
|
|
const x0 = Math.min(row.x, r.x), x1 = Math.max(row.x + row.w, r.x + r.w);
|
|
const y0 = Math.min(row.y, r.y), y1 = Math.max(row.y + row.h, r.y + r.h);
|
|
row.x = x0; row.w = x1 - x0; row.y = y0; row.h = y1 - y0;
|
|
}
|
|
return rows;
|
|
}
|