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webview.ts
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// Copyright 2019-2024 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
/**
* Provides APIs to create webviews, communicate with other webviews and manipulate the current webview.
*
* ## Webview events
*
* Events can be listened to using {@link Webview.listen}:
* ```typescript
* import { getCurrent } from "@tauri-apps/api/webview";
* getCurrent().listen("my-webview-event", ({ event, payload }) => { });
* ```
*
* @module
*/
import { PhysicalPosition, PhysicalSize } from './dpi'
import type { LogicalPosition, LogicalSize } from './dpi'
import type { EventName, EventCallback, UnlistenFn } from './event'
import {
TauriEvent,
// imported for documentation purposes
type EventTarget,
emit,
emitTo,
listen,
once
} from './event'
import { invoke } from './core'
import { Window, getCurrent as getCurrentWindow } from './window'
import { WebviewWindow } from './webviewWindow'
interface DragDropPayload {
paths: string[]
position: PhysicalPosition
}
interface DragOverPayload {
position: PhysicalPosition
}
/** The drag and drop event types. */
type DragDropEvent =
| ({ type: 'dragged' } & DragDropPayload)
| ({ type: 'dragOver' } & DragOverPayload)
| ({ type: 'dropped' } & DragDropPayload)
| { type: 'cancelled' }
/**
* Get an instance of `Webview` for the current webview.
*
* @since 2.0.0
*/
function getCurrent(): Webview {
return new Webview(
getCurrentWindow(),
window.__TAURI_INTERNALS__.metadata.currentWebview.label,
{
// @ts-expect-error `skip` is not defined in the public API but it is handled by the constructor
skip: true
}
)
}
/**
* Gets a list of instances of `Webview` for all available webviews.
*
* @since 2.0.0
*/
function getAll(): Webview[] {
return window.__TAURI_INTERNALS__.metadata.webviews.map(
(w) =>
new Webview(Window.getByLabel(w.windowLabel)!, w.label, {
// @ts-expect-error `skip` is not defined in the public API but it is handled by the constructor
skip: true
})
)
}
/** @ignore */
// events that are emitted right here instead of by the created webview
const localTauriEvents = ['tauri://created', 'tauri://error']
/** @ignore */
export type WebviewLabel = string
/**
* Create new webview or get a handle to an existing one.
*
* Webviews are identified by a *label* a unique identifier that can be used to reference it later.
* It may only contain alphanumeric characters `a-zA-Z` plus the following special characters `-`, `/`, `:` and `_`.
*
* @example
* ```typescript
* import { Window } from "@tauri-apps/api/window"
* import { Webview } from "@tauri-apps/api/webview"
*
* const appWindow = new Window('uniqueLabel');
*
* // loading embedded asset:
* const webview = new Webview(appWindow, 'theUniqueLabel', {
* url: 'path/to/page.html'
* });
* // alternatively, load a remote URL:
* const webview = new Webview(appWindow, 'theUniqueLabel', {
* url: 'https://github.com/tauri-apps/tauri'
* });
*
* webview.once('tauri://created', function () {
* // webview successfully created
* });
* webview.once('tauri://error', function (e) {
* // an error happened creating the webview
* });
*
* // emit an event to the backend
* await webview.emit("some-event", "data");
* // listen to an event from the backend
* const unlisten = await webview.listen("event-name", e => {});
* unlisten();
* ```
*
* @since 2.0.0
*/
class Webview {
/** The webview label. It is a unique identifier for the webview, can be used to reference it later. */
label: WebviewLabel
/** The window hosting this webview. */
window: Window
/** Local event listeners. */
// eslint-disable-next-line @typescript-eslint/no-explicit-any
listeners: Record<string, Array<EventCallback<any>>>
/**
* Creates a new Webview.
* @example
* ```typescript
* import { Window } from '@tauri-apps/api/window'
* import { Webview } from '@tauri-apps/api/webview'
* const appWindow = new Window('my-label')
* const webview = new Webview(appWindow, 'my-label', {
* url: 'https://github.com/tauri-apps/tauri'
* });
* webview.once('tauri://created', function () {
* // webview successfully created
* });
* webview.once('tauri://error', function (e) {
* // an error happened creating the webview
* });
* ```
*
* @param window the window to add this webview to.
* @param label The unique webview label. Must be alphanumeric: `a-zA-Z-/:_`.
* @returns The {@link Webview} instance to communicate with the webview.
*/
constructor(window: Window, label: WebviewLabel, options: WebviewOptions) {
this.window = window
this.label = label
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
this.listeners = Object.create(null)
// @ts-expect-error `skip` is not a public API so it is not defined in WebviewOptions
if (!options?.skip) {
invoke('plugin:webview|create_webview', {
windowLabel: window.label,
label,
options
})
.then(async () => this.emit('tauri://created'))
.catch(async (e: string) => this.emit('tauri://error', e))
}
}
/**
* Gets the Webview for the webview associated with the given label.
* @example
* ```typescript
* import { Webview } from '@tauri-apps/api/webview';
* const mainWebview = Webview.getByLabel('main');
* ```
*
* @param label The webview label.
* @returns The Webview instance to communicate with the webview or null if the webview doesn't exist.
*/
static getByLabel(label: string): Webview | null {
return getAll().find((w) => w.label === label) ?? null
}
/**
* Get an instance of `Webview` for the current webview.
*/
static getCurrent(): Webview {
return getCurrent()
}
/**
* Gets a list of instances of `Webview` for all available webviews.
*/
static getAll(): Webview[] {
return getAll()
}
/**
* Listen to an emitted event on this webview.
*
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* const unlisten = await getCurrent().listen<string>('state-changed', (event) => {
* console.log(`Got error: ${payload}`);
* });
*
* // you need to call unlisten if your handler goes out of scope e.g. the component is unmounted
* unlisten();
* ```
*
* @param event Event name. Must include only alphanumeric characters, `-`, `/`, `:` and `_`.
* @param handler Event handler.
* @returns A promise resolving to a function to unlisten to the event.
* Note that removing the listener is required if your listener goes out of scope e.g. the component is unmounted.
*/
async listen<T>(
event: EventName,
handler: EventCallback<T>
): Promise<UnlistenFn> {
if (this._handleTauriEvent(event, handler)) {
return Promise.resolve(() => {
// eslint-disable-next-line security/detect-object-injection
const listeners = this.listeners[event]
listeners.splice(listeners.indexOf(handler), 1)
})
}
return listen(event, handler, {
target: { kind: 'Webview', label: this.label }
})
}
/**
* Listen to an emitted event on this webview only once.
*
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* const unlisten = await getCurrent().once<null>('initialized', (event) => {
* console.log(`Webview initialized!`);
* });
*
* // you need to call unlisten if your handler goes out of scope e.g. the component is unmounted
* unlisten();
* ```
*
* @param event Event name. Must include only alphanumeric characters, `-`, `/`, `:` and `_`.
* @param handler Event handler.
* @returns A promise resolving to a function to unlisten to the event.
* Note that removing the listener is required if your listener goes out of scope e.g. the component is unmounted.
*/
async once<T>(event: string, handler: EventCallback<T>): Promise<UnlistenFn> {
if (this._handleTauriEvent(event, handler)) {
return Promise.resolve(() => {
// eslint-disable-next-line security/detect-object-injection
const listeners = this.listeners[event]
listeners.splice(listeners.indexOf(handler), 1)
})
}
return once(event, handler, {
target: { kind: 'Webview', label: this.label }
})
}
/**
* Emits an event to all {@link EventTarget|targets}.
*
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* await getCurrent().emit('webview-loaded', { loggedIn: true, token: 'authToken' });
* ```
*
* @param event Event name. Must include only alphanumeric characters, `-`, `/`, `:` and `_`.
* @param payload Event payload.
*/
async emit(event: string, payload?: unknown): Promise<void> {
if (localTauriEvents.includes(event)) {
// eslint-disable-next-line
for (const handler of this.listeners[event] || []) {
handler({
event,
id: -1,
payload
})
}
return Promise.resolve()
}
return emit(event, payload)
}
/**
* Emits an event to all {@link EventTarget|targets} matching the given target.
*
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* await getCurrent().emitTo('main', 'webview-loaded', { loggedIn: true, token: 'authToken' });
* ```
*
* @param target Label of the target Window/Webview/WebviewWindow or raw {@link EventTarget} object.
* @param event Event name. Must include only alphanumeric characters, `-`, `/`, `:` and `_`.
* @param payload Event payload.
*/
async emitTo(
target: string | EventTarget,
event: string,
payload?: unknown
): Promise<void> {
if (localTauriEvents.includes(event)) {
// eslint-disable-next-line
for (const handler of this.listeners[event] || []) {
handler({
event,
id: -1,
payload
})
}
return Promise.resolve()
}
return emitTo(target, event, payload)
}
/** @ignore */
_handleTauriEvent<T>(event: string, handler: EventCallback<T>): boolean {
if (localTauriEvents.includes(event)) {
if (!(event in this.listeners)) {
// eslint-disable-next-line
this.listeners[event] = [handler]
} else {
// eslint-disable-next-line
this.listeners[event].push(handler)
}
return true
}
return false
}
// Getters
/**
* The position of the top-left hand corner of the webview's client area relative to the top-left hand corner of the desktop.
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* const position = await getCurrent().position();
* ```
*
* @returns The webview's position.
*/
async position(): Promise<PhysicalPosition> {
return invoke<{ x: number; y: number }>('plugin:webview|webview_position', {
label: this.label
}).then(({ x, y }) => new PhysicalPosition(x, y))
}
/**
* The physical size of the webview's client area.
* The client area is the content of the webview, excluding the title bar and borders.
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* const size = await getCurrent().size();
* ```
*
* @returns The webview's size.
*/
async size(): Promise<PhysicalSize> {
return invoke<{ width: number; height: number }>(
'plugin:webview|webview_size',
{
label: this.label
}
).then(({ width, height }) => new PhysicalSize(width, height))
}
// Setters
/**
* Closes the webview.
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* await getCurrent().close();
* ```
*
* @returns A promise indicating the success or failure of the operation.
*/
async close(): Promise<void> {
return invoke('plugin:webview|close', {
label: this.label
})
}
/**
* Resizes the webview.
* @example
* ```typescript
* import { getCurrent, LogicalSize } from '@tauri-apps/api/webview';
* await getCurrent().setSize(new LogicalSize(600, 500));
* ```
*
* @param size The logical or physical size.
* @returns A promise indicating the success or failure of the operation.
*/
async setSize(size: LogicalSize | PhysicalSize): Promise<void> {
if (!size || (size.type !== 'Logical' && size.type !== 'Physical')) {
throw new Error(
'the `size` argument must be either a LogicalSize or a PhysicalSize instance'
)
}
const value = {} as Record<string, unknown>
value[`${size.type}`] = {
width: size.width,
height: size.height
}
return invoke('plugin:webview|set_webview_size', {
label: this.label,
value
})
}
/**
* Sets the webview position.
* @example
* ```typescript
* import { getCurrent, LogicalPosition } from '@tauri-apps/api/webview';
* await getCurrent().setPosition(new LogicalPosition(600, 500));
* ```
*
* @param position The new position, in logical or physical pixels.
* @returns A promise indicating the success or failure of the operation.
*/
async setPosition(
position: LogicalPosition | PhysicalPosition
): Promise<void> {
if (
!position ||
(position.type !== 'Logical' && position.type !== 'Physical')
) {
throw new Error(
'the `position` argument must be either a LogicalPosition or a PhysicalPosition instance'
)
}
const value = {} as Record<string, unknown>
value[`${position.type}`] = {
x: position.x,
y: position.y
}
return invoke('plugin:webview|set_webview_position', {
label: this.label,
value
})
}
/**
* Bring the webview to front and focus.
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* await getCurrent().setFocus();
* ```
*
* @returns A promise indicating the success or failure of the operation.
*/
async setFocus(): Promise<void> {
return invoke('plugin:webview|set_webview_focus', {
label: this.label
})
}
/**
* Set webview zoom level.
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* await getCurrent().setZoom(1.5);
* ```
*
* @returns A promise indicating the success or failure of the operation.
*/
async setZoom(scaleFactor: number): Promise<void> {
return invoke('plugin:webview|set_webview_zoom', {
label: this.label,
value: scaleFactor
})
}
/**
* Moves this webview to the given label.
* @example
* ```typescript
* import { getCurrent } from '@tauri-apps/api/webview';
* await getCurrent().reparent('other-window');
* ```
*
* @returns A promise indicating the success or failure of the operation.
*/
async reparent(window: Window | WebviewWindow | string): Promise<void> {
return invoke('plugin:webview|set_webview_focus', {
label: this.label,
window: typeof window === 'string' ? window : window.label
})
}
// Listeners
/**
* Listen to a file drop event.
* The listener is triggered when the user hovers the selected files on the webview,
* drops the files or cancels the operation.
*
* @example
* ```typescript
* import { getCurrent } from "@tauri-apps/api/webview";
* const unlisten = await getCurrent().onDragDropEvent((event) => {
* if (event.payload.type === 'hover') {
* console.log('User hovering', event.payload.paths);
* } else if (event.payload.type === 'drop') {
* console.log('User dropped', event.payload.paths);
* } else {
* console.log('File drop cancelled');
* }
* });
*
* // you need to call unlisten if your handler goes out of scope e.g. the component is unmounted
* unlisten();
* ```
*
* @returns A promise resolving to a function to unlisten to the event.
* Note that removing the listener is required if your listener goes out of scope e.g. the component is unmounted.
*/
async onDragDropEvent(
handler: EventCallback<DragDropEvent>
): Promise<UnlistenFn> {
const unlistenDrag = await this.listen<DragDropPayload>(
TauriEvent.DRAG,
(event) => {
handler({
...event,
payload: {
type: 'dragged',
paths: event.payload.paths,
position: mapPhysicalPosition(event.payload.position)
}
})
}
)
const unlistenDrop = await this.listen<DragDropPayload>(
TauriEvent.DROP,
(event) => {
handler({
...event,
payload: {
type: 'dropped',
paths: event.payload.paths,
position: mapPhysicalPosition(event.payload.position)
}
})
}
)
const unlistenDragOver = await this.listen<DragDropPayload>(
TauriEvent.DROP_CANCELLED,
(event) => {
handler({
...event,
payload: {
type: 'dragOver',
position: mapPhysicalPosition(event.payload.position)
}
})
}
)
const unlistenCancel = await this.listen<null>(
TauriEvent.DROP_CANCELLED,
(event) => {
handler({ ...event, payload: { type: 'cancelled' } })
}
)
return () => {
unlistenDrag()
unlistenDrop()
unlistenDragOver()
unlistenCancel()
}
}
}
function mapPhysicalPosition(m: PhysicalPosition): PhysicalPosition {
return new PhysicalPosition(m.x, m.y)
}
/**
* Configuration for the webview to create.
*
* @since 2.0.0
*/
interface WebviewOptions {
/**
* Remote URL or local file path to open.
*
* - URL such as `https://github.com/tauri-apps` is opened directly on a Tauri webview.
* - data: URL such as `data:text/html,<html>...` is only supported with the `webview-data-url` Cargo feature for the `tauri` dependency.
* - local file path or route such as `/path/to/page.html` or `/users` is appended to the application URL (the devServer URL on development, or `tauri://localhost/` and `https://tauri.localhost/` on production).
*/
url?: string
/** The initial vertical position. */
x: number
/** The initial horizontal position. */
y: number
/** The initial width. */
width: number
/** The initial height. */
height: number
/**
* Whether the webview is transparent or not.
* Note that on `macOS` this requires the `macos-private-api` feature flag, enabled under `tauri.conf.json > app > macOSPrivateApi`.
* WARNING: Using private APIs on `macOS` prevents your application from being accepted to the `App Store`.
*/
transparent?: boolean
/**
* Whether the drag and drop is enabled or not on the webview. By default it is enabled.
*
* Disabling it is required to use HTML5 drag and drop on the frontend on Windows.
*/
dragDropEnabled?: boolean
/**
* Whether clicking an inactive webview also clicks through to the webview on macOS.
*/
acceptFirstMouse?: boolean
/**
* The user agent for the webview.
*/
userAgent?: string
/**
* Whether or not the webview should be launched in incognito mode.
*
* #### Platform-specific
*
* - **Android:** Unsupported.
*/
incognito?: boolean
/**
* The proxy URL for the WebView for all network requests.
*
* Must be either a `http://` or a `socks5://` URL.
*
* #### Platform-specific
*
* - **macOS**: Requires the `macos-proxy` feature flag and only compiles for macOS 14+.
* */
proxyUrl?: string
/**
* Whether page zooming by hotkeys is enabled
*
* ## Platform-specific:
*
* - **Windows**: Controls WebView2's [`IsZoomControlEnabled`](https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/winrt/microsoft_web_webview2_core/corewebview2settings?view=webview2-winrt-1.0.2420.47#iszoomcontrolenabled) setting.
* - **MacOS / Linux**: Injects a polyfill that zooms in and out with `ctrl/command` + `-/=`,
* 20% in each step, ranging from 20% to 1000%. Requires `webview:allow-set-webview-zoom` permission
*
* - **Android / iOS**: Unsupported.
*/
zoomHotkeysEnabled?: boolean
}
export { Webview, getCurrent, getAll }
export type { DragDropEvent, DragDropPayload, WebviewOptions }