refactor: improve document Picture-in-Picture support checks and update type definitions

- Renamed variable `dpipOK` to `isSupported` for clarity in checking Document Picture-in-Picture support.
- Updated the `open` function to use the new `isSupported` variable.
- Removed redundant checks in the `close` function related to Document Picture-in-Picture support.
- Added `isSupported` and `isActive` properties to the plugin's result interface in TypeScript definitions.
- Cleaned up the code for better readability and maintainability.

packages/artplayer-plugin-document-pip/src/index.js

@@ -8,7 +8,7 @@ export default function artplayerPluginDocumentPip(userOptions = {}) {
   }
 
   return (art) => {
-    const dpipOK = 'documentPictureInPicture' in window
+    const isSupported = 'documentPictureInPicture' in window
       && typeof window.documentPictureInPicture?.requestWindow === 'function'
 
     const { proxy, icons, i18n, template: { $container }, constructor: { utils: { append, tooltip, addClass, removeClass } } } = art
@@ -63,7 +63,7 @@ export default function artplayerPluginDocumentPip(userOptions = {}) {
     }
 
     async function open() {
-      if (!dpipOK && options.fallbackToVideoPiP) {
+      if (!isSupported && options.fallbackToVideoPiP) {
         art.pip = true
         console.warn('[artplayer-plugin-document-pip] Document Picture-in-Picture is not supported, falling back to Video Picture-in-Picture')
         return
@@ -133,11 +133,6 @@ export default function artplayerPluginDocumentPip(userOptions = {}) {
     }
 
     function close() {
-      if (!dpipOK && options.fallbackToVideoPiP) {
-        art.pip = false
-        return
-      }
-
       if (!state.win)
         return
       try {
@@ -181,7 +176,8 @@ export default function artplayerPluginDocumentPip(userOptions = {}) {
 
     return {
       name: 'artplayerPluginDocumentPip',
-      state,
+      get isSupported() { return isSupported },
+      get isActive() { return !!state.win },
       open,
       close,
       toggle,