The `PresentationConnectionList` interface of the Web Presentation API provides a list of presentation connections that are currently available on the system. This includes both local and remote presentations.
Here are some key points about the `PresentationConnectionList` interface:
**Methods:**
* `getConnections()`: Returns an array of `PresentationConnection` objects, representing the currently active presentation connections.
* `addEventListener()`: Allows you to add an event listener to listen for changes to the list of presentation connections.
**Properties:**
* `onconnectchange`: An event handler that will be called when there is a change in the list of presentation connections.
* `onconnectionavailable`: An event handler that will be called when a new presentation connection becomes available.
* `onconnectiongone`: An event handler that will be called when an existing presentation connection goes away.
**Use Cases:**
1. **Getting the current presentation connections**: You can use the `getConnections()` method to retrieve an array of currently active presentation connections.
2. **Listening for changes to the list of presentation connections**: By adding an event listener using `addEventListener()`, you can be notified when new presentation connections become available or existing ones go away.
**Example Code:**
```javascript
// Get the PresentationConnectionList object
const presentationConnectionList = navigator.presentation;
// Add an event listener to listen for changes to the list of presentation connections
presentationConnectionList.addEventListener('connectchange', (event) => {
console.log(`New connection detected!`);
});
// Get the current list of presentation connections
const connections = presentationConnectionList.getConnections();
console.log(connections);
```
Note that this API is still experimental and may be subject to change. Additionally, the availability and behavior of this API may vary across different browsers and platforms.
Do you have any specific questions about using the `PresentationConnectionList` interface or would you like me to elaborate on any of these points?