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const PX_PER_MM = 96 / 25.4;
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export function pagePoint(x, y, rect, page, rotation) {
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const u = (x - rect.left) / rect.width;
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const v = (y - rect.top) / rect.height;
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const points = [[u, v], [v, 1 - u], [1 - u, 1 - v], [1 - v, u]];
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const point = points[rotation / 90];
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return { x: point[0] * page.width, y: point[1] * page.height };
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}
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export function objectTransform(box, page, dx, dy, corner = "") {
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if (!corner) {
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return {
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x: Math.max(-box.x, Math.min(dx, Math.max(-box.x, page.width - box.x - box.width))),
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y: Math.max(-box.y, Math.min(dy, Math.max(-box.y, page.height - box.y - box.height))),
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scale: 1,
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};
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}
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const left = corner.includes("w");
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const top = corner.includes("n");
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const x = left ? -dx : dx;
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const y = top ? -dy : dy;
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const limit = Math.min(
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(left ? box.x + box.width : page.width - box.x) / box.width,
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(top ? box.y + box.height : page.height - box.y) / box.height,
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);
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const scale = Math.max(Math.min(1 / Math.min(box.width, box.height), limit), Math.min(limit,
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1 + (x * box.width + y * box.height) / (box.width ** 2 + box.height ** 2)));
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return { x: left ? box.width * (1 - scale) : 0, y: top ? box.height * (1 - scale) : 0, scale };
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}
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export class CanvasEditor {
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constructor(viewer, options) {
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this.viewer = viewer;
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this.options = options;
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this.enabled = false;
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this.selected = null;
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this.nodes = new WeakMap();
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viewer.addEventListener("pointerdown", (event) => this.start(event));
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viewer.addEventListener("pointermove", (event) => this.move(event));
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viewer.addEventListener("pointerup", (event) => this.end(event));
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viewer.addEventListener("pointercancel", () => this.cancel());
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viewer.addEventListener("lostpointercapture", () => this.cancel());
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viewer.addEventListener("keydown", (event) => this.keyDown(event));
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viewer.addEventListener("dblclick", () => {
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const item = this.selected;
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if (this.enabled && item && !item.image && !this.options.busy()) {
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this.options.onEdit(item);
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}
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});
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viewer.addEventListener("scroll", () => this.cancel());
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window.addEventListener("blur", () => this.cancel());
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window.addEventListener("resize", () => this.cancel());
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}
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setEnabled(enabled) {
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this.enabled = enabled;
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this.viewer.classList.toggle("editing-select", enabled);
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if (!enabled) {
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this.clear();
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}
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}
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mount(index, page, surface) {
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const layer = document.createElement("div");
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layer.className = "edit-layer";
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for (const object of page.objects) {
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const node = document.createElement("div");
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node.className = "edit-object";
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node.tabIndex = 0;
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node.setAttribute("role", "button");
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node.setAttribute("aria-label", object.image ? "图片对象" : "文字对象");
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const item = { ...object, index, page: { width: page.width, height: page.height }, node, surface };
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this.nodes.set(node, item);
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node.addEventListener("focus", () => this.select(item));
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this.place(item);
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if (object.image) {
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for (const corner of ["nw", "ne", "sw", "se"]) {
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const handle = document.createElement("span");
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handle.className = `edit-handle edit-${corner}`;
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handle.dataset.corner = corner;
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node.append(handle);
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}
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}
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layer.append(node);
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if (this.selected?.index === index && this.selected.id === object.id) {
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this.select(item);
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}
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}
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surface.append(layer);
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if (this.selectLast && layer.lastElementChild) {
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this.selectLast = false;
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this.select(this.nodes.get(layer.lastElementChild));
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}
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}
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place(item, change = { x: 0, y: 0, scale: 1 }) {
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Object.assign(item.node.style, {
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left: `${(item.x + change.x) * PX_PER_MM}px`, top: `${(item.y + change.y) * PX_PER_MM}px`,
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width: `${item.width * change.scale * PX_PER_MM}px`, height: `${item.height * change.scale * PX_PER_MM}px`,
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});
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}
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select(item) {
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this.selected?.node.classList.remove("selected");
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this.selected = item;
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item?.node.classList.add("selected");
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this.options.onSelect(item);
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}
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clear() {
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this.cancel();
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this.selectLast = false;
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this.select(null);
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}
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start(event) {
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if (!this.enabled || this.options.busy() || event.button !== 0 || this.drag) {
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return;
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}
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const node = event.target.closest(".edit-object");
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if (!node) {
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this.select(null);
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return;
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}
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event.preventDefault();
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this.select(this.nodes.get(node));
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this.viewer.focus({ preventScroll: true });
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const item = this.selected;
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this.drag = {
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item, pointerID: event.pointerId, corner: event.target.dataset.corner || "",
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rect: item.surface.getBoundingClientRect(), rotation: this.options.rotation(),
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clientX: event.clientX, clientY: event.clientY,
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};
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this.viewer.setPointerCapture(event.pointerId);
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}
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move(event) {
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const drag = this.drag;
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if (!drag || drag.pointerID !== event.pointerId) {
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return;
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}
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event.preventDefault();
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if (!drag.change && Math.hypot(event.clientX - drag.clientX, event.clientY - drag.clientY) < 3) {
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return;
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}
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const from = pagePoint(drag.clientX, drag.clientY, drag.rect, drag.item.page, drag.rotation);
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const to = pagePoint(event.clientX, event.clientY, drag.rect, drag.item.page, drag.rotation);
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drag.change = objectTransform(drag.item, drag.item.page, to.x - from.x, to.y - from.y, drag.corner);
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this.place(drag.item, drag.change);
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}
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end(event) {
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const drag = this.drag;
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if (!drag || drag.pointerID !== event.pointerId) {
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return;
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}
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this.move(event);
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this.cancel();
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if (drag.change && (drag.change.x || drag.change.y || drag.change.scale !== 1)) {
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this.options.onTransform(drag.item, drag.change);
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}
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}
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cancel() {
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const drag = this.drag;
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this.drag = null;
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if (drag) {
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this.place(drag.item);
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if (this.viewer.hasPointerCapture(drag.pointerID)) {
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this.viewer.releasePointerCapture(drag.pointerID);
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}
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}
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}
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keyDown(event) {
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if (!this.enabled || !this.selected || this.options.busy() || event.ctrlKey || event.metaKey || event.altKey || event.isComposing) {
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return;
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}
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const directions = { ArrowLeft: [-1, 0], ArrowRight: [1, 0], ArrowUp: [0, -1], ArrowDown: [0, 1] };
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const edit = (event.key === "Enter" || event.key === "F2") && !this.selected.image;
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if (event.key !== "Escape" && event.key !== "Delete" && !edit && !directions[event.key]) {
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return;
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}
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event.preventDefault();
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event.stopPropagation();
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if (event.key === "Escape") {
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this.drag ? this.cancel() : this.clear();
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} else if (event.key === "Delete") {
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this.options.onDelete(this.selected);
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} else if (edit && !this.drag) {
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this.options.onEdit(this.selected);
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} else if (!this.drag) {
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const [x, y] = directions[event.key];
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const [dx, dy] = [[x, y], [y, -x], [-x, -y], [-y, x]][this.options.rotation() / 90];
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const step = event.shiftKey ? 10 : 1;
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const change = objectTransform(this.selected, this.selected.page,
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dx * step, dy * step);
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if (change.x || change.y) {
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this.options.onTransform(this.selected, change);
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}
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}
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}
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}
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