/
Editor.ts
1745 lines (1523 loc) · 52.2 KB
/
Editor.ts
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import EditorImage from './image/EditorImage';
import ToolController from './tools/ToolController';
import { EditorNotifier, EditorEventType, ImageLoader } from './types';
import { HTMLPointerEventName, HTMLPointerEventFilter, InputEvtType, PointerEvt, keyUpEventFromHTMLEvent, keyPressEventFromHTMLEvent } from './inputEvents';
import Command from './commands/Command';
import UndoRedoHistory from './UndoRedoHistory';
import Viewport from './Viewport';
import EventDispatcher from './EventDispatcher';
import { Point2, Vec2, Vec3, Color4, Mat33, Rect2 } from '@js-draw/math';
import Display, { RenderingMode } from './rendering/Display';
import SVGLoader from './SVGLoader';
import Pointer from './Pointer';
import { EditorLocalization } from './localization';
import getLocalizationTable from './localizations/getLocalizationTable';
import IconProvider from './toolbar/IconProvider';
import CanvasRenderer from './rendering/renderers/CanvasRenderer';
import untilNextAnimationFrame from './util/untilNextAnimationFrame';
import uniteCommands from './commands/uniteCommands';
import SelectionTool from './tools/SelectionTool/SelectionTool';
import AbstractComponent from './components/AbstractComponent';
import Erase from './commands/Erase';
import BackgroundComponent, { BackgroundType } from './components/BackgroundComponent';
import sendPenEvent from './testing/sendPenEvent';
import KeyboardShortcutManager from './shortcuts/KeyboardShortcutManager';
import KeyBinding from './shortcuts/KeyBinding';
import AbstractToolbar from './toolbar/AbstractToolbar';
import EdgeToolbar from './toolbar/EdgeToolbar';
import StrokeKeyboardControl from './tools/InputFilter/StrokeKeyboardControl';
import guessKeyCodeFromKey from './util/guessKeyCodeFromKey';
import RenderablePathSpec from './rendering/RenderablePathSpec';
import makeAboutDialog, { AboutDialogEntry } from './dialogs/makeAboutDialog';
import version from './version';
import { editorImageToSVGSync, editorImageToSVGAsync } from './image/export/editorImageToSVG';
import ReactiveValue, { MutableReactiveValue } from './util/ReactiveValue';
import listenForKeyboardEventsFrom from './util/listenForKeyboardEventsFrom';
import mitLicenseAttribution from './util/mitLicenseAttribution';
import { PenTypeRecord } from './toolbar/widgets/PenToolWidget';
import ClipboardHandler from './util/ClipboardHandler';
/**
* Provides settings to an instance of an editor. See the Editor {@link Editor.constructor}.
*
* ## Example
*
* [[include:doc-pages/inline-examples/settings-example-1.md]]
*/
export interface EditorSettings {
/** Defaults to `RenderingMode.CanvasRenderer` */
renderingMode: RenderingMode,
/** Uses a default English localization if a translation is not given. */
localization: Partial<EditorLocalization>,
/**
* `true` if touchpad/mousewheel scrolling should scroll the editor instead of the document.
* This does not include pinch-zoom events.
* Defaults to true.
*/
wheelEventsEnabled: boolean|'only-if-focused';
/** Minimum zoom fraction (e.g. 0.5 → 50% zoom). Defaults to $2 \cdot 10^{-10}$. */
minZoom: number,
/** Maximum zoom fraction (e.g. 2 → 200% zoom). Defaults to $1 \cdot 10^{12}$. */
maxZoom: number,
/**
* Overrides for keyboard shortcuts. For example,
* ```ts
* {
* 'some.shortcut.id': [ KeyBinding.keyboardShortcutFromString('ctrl+a') ],
* 'another.shortcut.id': [ ]
* }
* ```
* where shortcut IDs map to lists of associated keybindings.
*
* @see
* - {@link KeyBinding}
* - {@link KeyboardShortcutManager}
*/
keyboardShortcutOverrides: Record<string, Array<KeyBinding>>,
/**
* Provides a set of icons for the editor.
*
* See, for example, the `@js-draw/material-icons` package.
*/
iconProvider: IconProvider,
/**
* Additional messages to show in the "about" dialog.
*/
notices: AboutDialogEntry[],
/**
* Information about the app/website js-draw is running within
* to show at the beginning of the about dialog.
*/
appInfo: {
name: string,
// (Optional) A brief description of the app
description?: string;
// (Optional) The app version
version?: string,
}|null,
/**
* Configures the default pen tools.
*
* **Example**:
* [[include:doc-pages/inline-examples/editor-settings-polyline-pen.md]]
*/
pens: {
/**
* Additional pen types that can be selected in a toolbar.
*/
additionalPenTypes?: readonly Readonly<PenTypeRecord>[],
/**
* Should return `true` if a pen type should be shown in the toolbar.
*
* @example
* ```ts,runnable
* import {Editor} from 'js-draw';
* const editor = new Editor(document.body, {
* // Only allow selecting the polyline pen from the toolbar.
* pens: { filterPenTypes: p => p.id === 'polyline-pen' },
* });
* editor.addToolbar();
* ```
* Notice that this setting only affects the toolbar GUI.
*/
filterPenTypes?: (penType: PenTypeRecord)=>boolean,
}|null,
}
/**
* The main entrypoint for the full editor.
*
* ## Example
* To create an editor with a toolbar,
* ```ts,runnable
* import { Editor } from 'js-draw';
*
* const editor = new Editor(document.body);
*
* const toolbar = editor.addToolbar();
* toolbar.addSaveButton(() => {
* const saveData = editor.toSVG().outerHTML;
* // Do something with saveData...
* });
* ```
*
* See also
* * [`examples.md`](https://github.com/personalizedrefrigerator/js-draw/blob/main/docs/examples.md).
*/
export class Editor {
// Wrapper around the viewport and toolbar
private container: HTMLElement;
private renderingRegion: HTMLElement;
/** Manages drawing surfaces/{@link AbstractRenderer}s. */
public display: Display;
/**
* Handles undo/redo.
*
* @example
* ```
* const editor = new Editor(document.body);
*
* // Do something undoable.
* // ...
*
* // Undo the last action
* editor.history.undo();
* ```
*/
public history: UndoRedoHistory;
/**
* Data structure for adding/removing/querying objects in the image.
*
* @example
* ```ts,runnable
* import { Editor, Stroke, Path, Color4, pathToRenderable } from 'js-draw';
* const editor = new Editor(document.body);
*
* // Create a path.
* const stroke = new Stroke([
* pathToRenderable(Path.fromString('M0,0 L100,100 L300,30 z'), { fill: Color4.red }),
* ]);
* const addElementCommand = editor.image.addElement(stroke);
*
* // Add the stroke to the editor
* editor.dispatch(addElementCommand);
* ```
*/
public readonly image: EditorImage;
/**
* Allows transforming the view and querying information about
* what is currently visible.
*/
public readonly viewport: Viewport;
/** @internal */
public readonly localization: EditorLocalization;
/** {@link EditorSettings.iconProvider} */
public readonly icons: IconProvider;
/**
* Manages and allows overriding of keyboard shortcuts.
*
* @internal
*/
public readonly shortcuts: KeyboardShortcutManager;
/**
* Controls the list of tools. See
* [the custom tool example](https://github.com/personalizedrefrigerator/js-draw/tree/main/docs/examples/example-custom-tools)
* for more.
*/
public readonly toolController: ToolController;
/**
* Global event dispatcher/subscriber.
*
* @example
*
* ```ts,runnable
* import { Editor, EditorEventType, SerializableCommand } from 'js-draw';
*
* // Create a minimal editor
* const editor = new Editor(document.body);
* editor.addToolbar();
*
* // Create a place to show text output
* const log = document.createElement('textarea');
* document.body.appendChild(log);
* log.style.width = '100%';
* log.style.height = '200px';
*
* // Listen for CommandDone events (there's also a CommandUndone)
* editor.notifier.on(EditorEventType.CommandDone, event => {
* // Type narrowing for TypeScript -- event will always be of kind CommandDone,
* // but TypeScript doesn't know this.
* if (event.kind !== EditorEventType.CommandDone) return;
*
* log.value = `Command done ${event.command.description(editor, editor.localization)}\n`;
*
* if (event.command instanceof SerializableCommand) {
* log.value += `serializes to: ${JSON.stringify(event.command.serialize())}`;
* }
* });
*
* // Dispatch an initial command to trigger the event listener for the first time
* editor.dispatch(editor.image.setAutoresizeEnabled(true));
* ```
*/
public readonly notifier: EditorNotifier;
private loadingWarning: HTMLElement;
private accessibilityAnnounceArea: HTMLElement;
private accessibilityControlArea: HTMLTextAreaElement;
private eventListenerTargets: HTMLElement[] = [];
private readOnly: MutableReactiveValue<boolean>;
private readonly settings: Readonly<EditorSettings>;
/**
* @example
* ```ts,runnable
* import { Editor } from 'js-draw';
*
* const container = document.body;
*
* // Create an editor
* const editor = new Editor(container, {
* // 2e-10 and 1e12 are the default values for minimum/maximum zoom.
* minZoom: 2e-10,
* maxZoom: 1e12,
* });
*
* // Add the default toolbar
* const toolbar = editor.addToolbar();
*
* const createCustomIcon = () => {
* // Create/return an icon here.
* };
*
* // Add a custom button
* toolbar.addActionButton({
* label: 'Custom Button'
* icon: createCustomIcon(),
* }, () => {
* // Do something here
* });
* ```
*/
public constructor(
parent: HTMLElement,
settings: Partial<EditorSettings> = {},
) {
this.localization = {
...getLocalizationTable(),
...settings.localization,
};
// Fill default settings.
this.settings = {
wheelEventsEnabled: settings.wheelEventsEnabled ?? true,
renderingMode: settings.renderingMode ?? RenderingMode.CanvasRenderer,
localization: this.localization,
minZoom: settings.minZoom ?? 2e-10,
maxZoom: settings.maxZoom ?? 1e12,
keyboardShortcutOverrides: settings.keyboardShortcutOverrides ?? {},
iconProvider: settings.iconProvider ?? new IconProvider(),
notices: [],
appInfo: settings.appInfo ? { ...settings.appInfo } : null,
pens: {
additionalPenTypes: settings.pens?.additionalPenTypes ?? [],
filterPenTypes: settings.pens?.filterPenTypes ?? (()=>true)
},
};
// Validate settings
if (this.settings.minZoom > this.settings.maxZoom) {
throw new Error('Minimum zoom must be lesser than maximum zoom!');
}
this.readOnly = MutableReactiveValue.fromInitialValue(false);
this.icons = this.settings.iconProvider;
this.shortcuts = new KeyboardShortcutManager(this.settings.keyboardShortcutOverrides);
this.container = document.createElement('div');
this.renderingRegion = document.createElement('div');
this.container.appendChild(this.renderingRegion);
this.container.classList.add('imageEditorContainer', 'js-draw');
this.loadingWarning = document.createElement('div');
this.loadingWarning.classList.add('loadingMessage');
this.loadingWarning.ariaLive = 'polite';
this.container.appendChild(this.loadingWarning);
this.accessibilityControlArea = document.createElement('textarea');
this.accessibilityControlArea.setAttribute('placeholder', this.localization.accessibilityInputInstructions);
this.accessibilityControlArea.style.opacity = '0';
this.accessibilityControlArea.style.width = '0';
this.accessibilityControlArea.style.height = '0';
this.accessibilityControlArea.style.position = 'absolute';
this.accessibilityAnnounceArea = document.createElement('div');
this.accessibilityAnnounceArea.setAttribute('aria-live', 'assertive');
this.accessibilityAnnounceArea.className = 'accessibilityAnnouncement';
this.container.appendChild(this.accessibilityAnnounceArea);
this.renderingRegion.style.touchAction = 'none';
this.renderingRegion.className = 'imageEditorRenderArea';
this.renderingRegion.appendChild(this.accessibilityControlArea);
this.renderingRegion.setAttribute('tabIndex', '0');
this.renderingRegion.setAttribute('alt', '');
this.notifier = new EventDispatcher();
this.viewport = new Viewport((oldTransform, newTransform) => {
this.notifier.dispatch(EditorEventType.ViewportChanged, {
kind: EditorEventType.ViewportChanged,
newTransform,
oldTransform,
});
});
this.display = new Display(this, this.settings.renderingMode, this.renderingRegion);
this.image = new EditorImage();
this.history = new UndoRedoHistory(this, this.announceRedoCallback, this.announceUndoCallback);
this.toolController = new ToolController(this, this.localization);
// TODO: Make this pipeline configurable (e.g. allow users to add global input stabilization)
this.toolController.addInputMapper(StrokeKeyboardControl.fromEditor(this));
parent.appendChild(this.container);
this.viewport.updateScreenSize(
Vec2.of(this.display.width, this.display.height)
);
this.registerListeners();
this.queueRerender();
this.hideLoadingWarning();
// Enforce zoom limits.
this.notifier.on(EditorEventType.ViewportChanged, evt => {
if (evt.kind !== EditorEventType.ViewportChanged) return;
const getZoom = (mat: Mat33) => mat.transformVec3(Vec2.unitX).length();
const zoom = getZoom(evt.newTransform);
if (zoom > this.settings.maxZoom || zoom < this.settings.minZoom) {
const oldZoom = getZoom(evt.oldTransform);
let resetTransform = Mat33.identity;
if (oldZoom <= this.settings.maxZoom && oldZoom >= this.settings.minZoom) {
resetTransform = evt.oldTransform;
} else {
// If 1x zoom isn't acceptable, try a zoom between the minimum and maximum.
resetTransform = Mat33.scaling2D(
(this.settings.minZoom + this.settings.maxZoom) / 2
);
}
this.viewport.resetTransform(resetTransform);
}
else if (!isFinite(zoom)) {
// Recover from possible division-by-zero
console.warn(
`Non-finite zoom (${zoom}) detected. Resetting the viewport. This was likely caused by division by zero.`
);
if (isFinite(getZoom(evt.oldTransform))) {
this.viewport.resetTransform(evt.oldTransform);
} else {
this.viewport.resetTransform();
}
}
});
}
/**
* @returns a shallow copy of the current settings of the editor.
*
* Do not modify.
*/
public getCurrentSettings(): Readonly<EditorSettings> {
return {
...this.settings,
};
}
/**
* @returns a reference to the editor's container.
*
* @example
* ```
* // Set the editor's height to 500px
* editor.getRootElement().style.height = '500px';
* ```
*/
public getRootElement(): HTMLElement {
return this.container;
}
/** @param fractionLoaded - should be a number from 0 to 1, where 1 represents completely loaded. */
public showLoadingWarning(fractionLoaded: number) {
const loadingPercent = Math.round(fractionLoaded * 100);
this.loadingWarning.innerText = this.localization.loading(loadingPercent);
this.loadingWarning.style.display = 'block';
}
public hideLoadingWarning() {
this.loadingWarning.style.display = 'none';
this.announceForAccessibility(this.localization.doneLoading);
}
private previousAccessibilityAnnouncement: string = '';
/**
* Announce `message` for screen readers. If `message` is the same as the previous
* message, it is re-announced.
*/
public announceForAccessibility(message: string) {
// Force re-announcing an announcement if announced again.
if (message === this.previousAccessibilityAnnouncement) {
message = message + '. ';
}
this.accessibilityAnnounceArea.innerText = message;
this.previousAccessibilityAnnouncement = message;
}
/**
* Creates a toolbar. If `defaultLayout` is true, default buttons are used.
* @returns a reference to the toolbar.
*/
public addToolbar(defaultLayout: boolean = true): AbstractToolbar {
const toolbar = new EdgeToolbar(this, this.container, this.localization);
if (defaultLayout) {
toolbar.addDefaults();
}
return toolbar;
}
private registerListeners() {
this.handlePointerEventsFrom(this.renderingRegion);
this.handleKeyEventsFrom(this.renderingRegion);
this.handlePointerEventsFrom(this.accessibilityAnnounceArea);
// Prevent selected text from control areas from being dragged.
// See https://github.com/personalizedrefrigerator/joplin-plugin-freehand-drawing/issues/8
const preventSelectionOf = [
this.renderingRegion,
this.accessibilityAnnounceArea,
this.accessibilityControlArea,
this.loadingWarning,
];
for (const element of preventSelectionOf) {
element.addEventListener('drag', event => {
event.preventDefault();
return false;
});
element.addEventListener('dragstart', event => {
event.preventDefault();
return false;
});
}
this.container.addEventListener('wheel', evt => {
this.handleHTMLWheelEvent(evt);
});
const handleResize = () => {
this.viewport.updateScreenSize(
Vec2.of(this.display.width, this.display.height)
);
this.rerender();
this.updateEditorSizeVariables();
};
if ('ResizeObserver' in (window as any)) {
const resizeObserver = new ResizeObserver(handleResize);
resizeObserver.observe(this.renderingRegion);
resizeObserver.observe(this.container);
} else {
addEventListener('resize', handleResize);
}
this.accessibilityControlArea.addEventListener('input', () => {
this.accessibilityControlArea.value = '';
});
const copyHandler = new ClipboardHandler(this);
document.addEventListener('copy', async evt => {
if (!this.isEventSink(document.querySelector(':focus'))) {
return;
}
copyHandler.copy(evt);
});
document.addEventListener('paste', evt => {
this.handlePaste(evt);
});
}
private updateEditorSizeVariables() {
// Add CSS variables so that absolutely-positioned children of the editor can
// still fill the screen.
this.container.style.setProperty(
'--editor-current-width-px', `${this.container.clientWidth}px`
);
this.container.style.setProperty(
'--editor-current-height-px', `${this.container.clientHeight}px`
);
this.container.style.setProperty(
'--editor-current-display-width-px', `${this.renderingRegion.clientWidth}px`
);
this.container.style.setProperty(
'--editor-current-display-height-px', `${this.renderingRegion.clientHeight}px`
);
}
/** @internal */
public handleHTMLWheelEvent(event: WheelEvent) {
let delta = Vec3.of(event.deltaX, event.deltaY, event.deltaZ);
// Process wheel events if the ctrl key is down, even if disabled -- we do want to handle
// pinch-zooming.
if (!event.ctrlKey && !event.metaKey) {
if (!this.settings.wheelEventsEnabled) {
return;
} else if (this.settings.wheelEventsEnabled === 'only-if-focused') {
const focusedChild = this.container.querySelector(':focus');
if (!focusedChild) {
return;
}
}
}
if (event.deltaMode === WheelEvent.DOM_DELTA_LINE) {
delta = delta.times(15);
} else if (event.deltaMode === WheelEvent.DOM_DELTA_PAGE) {
delta = delta.times(100);
}
if (event.ctrlKey || event.metaKey) {
delta = Vec3.of(0, 0, event.deltaY);
}
// Ensure that `pos` is relative to `this.renderingRegion`
const bbox = this.renderingRegion.getBoundingClientRect();
const pos = Vec2.of(event.clientX, event.clientY).minus(Vec2.of(bbox.left, bbox.top));
if (this.toolController.dispatchInputEvent({
kind: InputEvtType.WheelEvt,
delta,
screenPos: pos,
})) {
event.preventDefault();
return true;
}
return false;
}
private pointers: Record<number, Pointer> = {};
private getPointerList() {
const nowTime = performance.now();
const res: Pointer[] = [];
for (const id in this.pointers) {
const maxUnupdatedTime = 2000; // Maximum time without a pointer update (ms)
if (this.pointers[id] && (nowTime - this.pointers[id].timeStamp) < maxUnupdatedTime) {
res.push(this.pointers[id]);
}
}
return res;
}
/**
* A protected method that can override setPointerCapture in environments where it may fail
* (e.g. with synthetic events). @internal
*/
protected setPointerCapture(target: HTMLElement, pointerId: number) {
try {
target.setPointerCapture(pointerId);
} catch (error) {
console.warn('Failed to setPointerCapture', error);
}
}
/** Can be overridden in a testing environment to handle synthetic events. @internal */
protected releasePointerCapture(target: HTMLElement, pointerId: number) {
try {
target.releasePointerCapture(pointerId);
} catch (error) {
console.warn('Failed to releasePointerCapture', error);
}
}
/**
* Dispatches a `PointerEvent` to the editor. The target element for `evt` must have the same top left
* as the content of the editor.
*/
public handleHTMLPointerEvent(eventType: 'pointerdown'|'pointermove'|'pointerup'|'pointercancel', evt: PointerEvent): boolean {
const eventsRelativeTo = this.renderingRegion;
const eventTarget = (evt.target as HTMLElement|null) ?? this.renderingRegion;
if (eventType === 'pointerdown') {
const pointer = Pointer.ofEvent(evt, true, this.viewport, eventsRelativeTo);
this.pointers[pointer.id] = pointer;
this.setPointerCapture(eventTarget, pointer.id);
const event: PointerEvt = {
kind: InputEvtType.PointerDownEvt,
current: pointer,
allPointers: this.getPointerList(),
};
this.toolController.dispatchInputEvent(event);
return true;
}
else if (eventType === 'pointermove') {
const pointer = Pointer.ofEvent(
evt, this.pointers[evt.pointerId]?.down ?? false, this.viewport, eventsRelativeTo
);
if (pointer.down) {
const prevData = this.pointers[pointer.id];
if (prevData) {
const distanceMoved = pointer.screenPos.distanceTo(prevData.screenPos);
// If the pointer moved less than two pixels, don't send a new event.
if (distanceMoved < 2) {
return false;
}
}
this.pointers[pointer.id] = pointer;
if (this.toolController.dispatchInputEvent({
kind: InputEvtType.PointerMoveEvt,
current: pointer,
allPointers: this.getPointerList(),
})) {
evt.preventDefault();
}
}
return true;
}
else if (eventType === 'pointercancel' || eventType === 'pointerup') {
const pointer = Pointer.ofEvent(evt, false, this.viewport, eventsRelativeTo);
if (!this.pointers[pointer.id]) {
return false;
}
this.pointers[pointer.id] = pointer;
this.releasePointerCapture(eventTarget, pointer.id);
if (this.toolController.dispatchInputEvent({
kind: InputEvtType.PointerUpEvt,
current: pointer,
allPointers: this.getPointerList(),
})) {
evt.preventDefault();
}
delete this.pointers[pointer.id];
return true;
}
return eventType;
}
private isEventSink(evtTarget: Element|EventTarget|null) {
let currentElem: Element|null = evtTarget as Element|null;
while (currentElem !== null) {
for (const elem of this.eventListenerTargets) {
if (elem === currentElem) {
return true;
}
}
currentElem = currentElem.parentElement;
}
return false;
}
/** @internal */
protected async handleDrop(evt: DragEvent|ClipboardEvent) {
evt.preventDefault();
this.handlePaste(evt);
}
/** @internal */
protected async handlePaste(evt: DragEvent|ClipboardEvent) {
const target = document.querySelector(':focus') ?? evt.target;
if (!this.isEventSink(target)) {
return;
}
return await new ClipboardHandler(this).paste(evt);
}
/**
* Forward pointer events from `elem` to this editor. Such that right-click/right-click drag
* events are also forwarded, `elem`'s contextmenu is disabled.
*
* `filter` is called once per pointer event, before doing any other processing. If `filter` returns `true` the event is
* forwarded to the editor.
*
* **Note**: `otherEventsFilter` is like `filter`, but is called for other pointer-related
* events that could also be forwarded to the editor. To forward just pointer events,
* for example, `otherEventsFilter` could be given as `()=>false`.
*
* @example
* ```ts
* const overlay = document.createElement('div');
* editor.createHTMLOverlay(overlay);
*
* // Send all pointer events that don't have the control key pressed
* // to the editor.
* editor.handlePointerEventsFrom(overlay, (event) => {
* if (event.ctrlKey) {
* return false;
* }
* return true;
* });
* ```
*/
public handlePointerEventsFrom(
elem: HTMLElement,
filter?: HTMLPointerEventFilter,
otherEventsFilter?: (eventName: string, event: Event)=>boolean,
) {
// May be required to prevent text selection on iOS/Safari:
// See https://stackoverflow.com/a/70992717/17055750
const touchstartListener = (evt: Event) => {
if (otherEventsFilter && !otherEventsFilter('touchstart', evt)) {
return;
}
evt.preventDefault();
};
const contextmenuListener = (evt: Event) => {
if (otherEventsFilter && !otherEventsFilter('contextmenu', evt)) {
return;
}
// Don't show a context menu
evt.preventDefault();
};
const listeners: Record<string, (event: Event)=>void> = {
'touchstart': touchstartListener,
'contextmenu': contextmenuListener,
};
const eventNames: HTMLPointerEventName[] = ['pointerdown', 'pointermove', 'pointerup', 'pointercancel'];
for (const eventName of eventNames) {
listeners[eventName] = (evt: Event) => {
// This listener will only be called in the context of PointerEvents.
const event = evt as PointerEvent;
if (filter && !filter(eventName, event)) {
return undefined;
}
return this.handleHTMLPointerEvent(eventName, event);
};
}
// Add all listeners.
for (const eventName in listeners) {
elem.addEventListener(eventName, listeners[eventName]);
}
return {
/** Remove all event listeners registered by this function. */
remove: () => {
for (const eventName in listeners) {
elem.removeEventListener(eventName, listeners[eventName]);
}
},
};
}
/**
* Like {@link handlePointerEventsFrom} except ignores short input gestures like clicks.
*
* `filter` is called once per event, before doing any other processing. If `filter` returns `true` the event is
* forwarded to the editor.
*
* `otherEventsFilter` is passed unmodified to `handlePointerEventsFrom`.
*/
public handlePointerEventsExceptClicksFrom(
elem: HTMLElement,
filter?: HTMLPointerEventFilter,
otherEventsFilter?: (eventName: string, event: Event)=>boolean,
) {
type GestureRecord = {
// Buffer events: Send events to the editor only if the pointer has moved enough to
// suggest that the user is attempting to draw, rather than click to close the color picker.
eventBuffer: [ HTMLPointerEventName, PointerEvent ][];
hasMovedSignificantly: boolean;
startPoint: Point2;
};
// Maps pointer IDs to gesture start points
const gestureData: Record<number, GestureRecord> = Object.create(null);
return this.handlePointerEventsFrom(elem, (eventName, event) => {
if (filter && !filter(eventName, event)) {
return false;
}
// Position of the current event.
// jsdom doesn't seem to support pageX/pageY -- use clientX/clientY if unavailable
const currentPos = Vec2.of(
event.pageX ?? event.clientX, event.pageY ?? event.clientY
);
const pointerId = event.pointerId ?? 0;
// Whether to send the current event to the editor
let sendToEditor = true;
if (eventName === 'pointerdown') {
// Buffer the event, but don't send it to the editor yet.
// We don't want to send single-click events, but we do want to send full strokes.
gestureData[pointerId] = {
eventBuffer: [ [eventName, event] ],
startPoint: currentPos,
hasMovedSignificantly: false,
};
// Capture the pointer so we receive future events even if the overlay is hidden.
this.setPointerCapture(elem, event.pointerId);
// Don't send to the editor.
sendToEditor = false;
}
else if (eventName === 'pointermove' && gestureData[pointerId]) {
const gestureStartPos = gestureData[pointerId].startPoint;
const eventBuffer = gestureData[pointerId].eventBuffer;
// Skip if the pointer hasn't moved enough to not be a "click".
const strokeStartThreshold = 10;
const isWithinClickThreshold = gestureStartPos && currentPos.distanceTo(gestureStartPos) < strokeStartThreshold;
if (isWithinClickThreshold && !gestureData[pointerId].hasMovedSignificantly) {
eventBuffer.push([ eventName, event ]);
sendToEditor = false;
} else {
// Send all buffered events to the editor -- start the stroke.
for (const [ eventName, event ] of eventBuffer) {
this.handleHTMLPointerEvent(eventName, event);
}
gestureData[pointerId].eventBuffer = [];
gestureData[pointerId].hasMovedSignificantly = true;
sendToEditor = true;
}
}
// Pointers that aren't down -- send to the editor.
else if (eventName === 'pointermove') {
sendToEditor = true;
}
// Otherwise, if we received a pointerup/pointercancel without flushing all pointerevents from the
// buffer, the gesture wasn't recognised as a stroke. Thus, the editor isn't expecting a pointerup/
// pointercancel event.
else if (
(eventName === 'pointerup' || eventName === 'pointercancel')
&& gestureData[pointerId] && gestureData[pointerId].eventBuffer.length > 0
) {
this.releasePointerCapture(elem, event.pointerId);
// Don't send to the editor.
sendToEditor = false;
delete gestureData[pointerId];
}
// Forward all other events to the editor.
return sendToEditor;
}, otherEventsFilter);
}
/** @internal */
public handleHTMLKeyDownEvent(htmlEvent: KeyboardEvent) {
console.assert(
htmlEvent.type === 'keydown',
`handling a keydown event with type ${htmlEvent.type}`
);
const event = keyPressEventFromHTMLEvent(htmlEvent);
if (this.toolController.dispatchInputEvent(event)) {
htmlEvent.preventDefault();
return true;
} else if (event.key === 't' || event.key === 'T') {
htmlEvent.preventDefault();
this.display.rerenderAsText();
return true;
} else if (event.key === 'Escape') {
this.renderingRegion.blur();
return true;
}
return false;
}
/** @internal */
public handleHTMLKeyUpEvent(htmlEvent: KeyboardEvent) {
console.assert(
htmlEvent.type === 'keyup',
`Handling a keyup event with type ${htmlEvent.type}`,
);
const event = keyUpEventFromHTMLEvent(htmlEvent);
if (this.toolController.dispatchInputEvent(event)) {
htmlEvent.preventDefault();
return true;
}
return false;
}
/**
* Adds event listners for keypresses (and drop events) on `elem` and forwards those
* events to the editor.
*
* If the given `filter` returns `false` for an event, the event is ignored and not
* passed to the editor.
*/
public handleKeyEventsFrom(
elem: HTMLElement,
filter: (event: KeyboardEvent)=>boolean = ()=>true
) {
listenForKeyboardEventsFrom(elem, {
filter,
handleKeyDown: (htmlEvent) => {
this.handleHTMLKeyDownEvent(htmlEvent);
},
handleKeyUp: (htmlEvent) => {
this.handleHTMLKeyUpEvent(htmlEvent);
},
getHandlesKeyEventsFrom: (element) => {
return this.eventListenerTargets.includes(element as HTMLElement);
},
});