[Media UI] Extend YouTube video events to all media views.

These events should be available for all YouTube videos, regardless of
where they are rendered:

- `add-to-playlist`
- `remove-from-playlist`
- `download`

platypush/backend/http/webapp/src/components/panels/Media/Item.vue

@@ -17,6 +17,10 @@
                           v-if="item.type !== 'torrent'" />
             <DropdownItem icon-class="fa fa-download" text="Download" @click="$emit('download')"
                           v-if="(item.type === 'torrent' || item.type === 'youtube') && item.item_type !== 'channel' && item.item_type !== 'playlist'" />
+            <DropdownItem icon-class="fa fa-list" text="Add to playlist" @click="$emit('add-to-playlist')"
+                          v-if="item.type === 'youtube'" />
+            <DropdownItem icon-class="fa fa-trash" text="Remove from playlist" @click="$emit('remove-from-playlist')"
+                          v-if="item.type === 'youtube' && playlist?.length" />
             <DropdownItem icon-class="fa fa-window-maximize" text="View in browser" @click="$emit('view')"
                           v-if="item.type === 'file'" />
             <DropdownItem icon-class="fa fa-info-circle" text="Info" @click="$emit('select')" />
@@ -48,7 +52,15 @@ import Utils from "@/Utils";
 export default {
   components: {Dropdown, DropdownItem, MediaImage},
   mixins: [Utils],
-  emits: ['play', 'select', 'view', 'download'],
+  emits: [
+    'add-to-playlist',
+    'download',
+    'play',
+    'remove-from-playlist',
+    'select',
+    'view',
+  ],
+
   props: {
     item: {
       type: Object,
@@ -64,6 +76,10 @@ export default {
       type: Boolean,
       default: false,
     },
+
+    playlist: {
+      type: String,
+    },
   },
 
   data() {

platypush/backend/http/webapp/src/components/panels/Media/Providers/YouTube.vue

@@ -26,6 +26,8 @@
 
         <Subscriptions :filter="filter"
                        :selected-channel="selectedChannel_"
+                       @add-to-playlist="$emit('add-to-playlist', $event)"
+                       @download="$emit('download', $event)"
                        @play="$emit('play', $event)"
                        @select="onChannelSelected"
                        v-else-if="selectedView === 'subscriptions'"
@@ -196,6 +198,7 @@ export default {
   .body {
     height: calc(100% - $media-nav-height - 2px);
     margin-top: 2px;
+    overflow-y: auto;
   }
 }
 </style>

platypush/backend/http/webapp/src/components/panels/Media/Providers/YouTube/Channel.vue

@@ -43,8 +43,10 @@
 
       <Results :results="channel.items"
                :filter="filter"
+               :result-index-step="null"
                :selected-result="selectedResult"
                ref="results"
+               @add-to-playlist="$emit('add-to-playlist', $event)"
                @download="$emit('download', $event)"
                @play="$emit('play', $event)"
                @scroll-end="loadNextPage"
@@ -60,8 +62,13 @@ import Results from "@/components/panels/Media/Results";
 import Utils from "@/Utils";
 
 export default {
-  emits: ['download', 'play'],
   mixins: [Utils],
+  emits: [
+    'add-to-playlist',
+    'download',
+    'play',
+  ],
+
   components: {
     Loading,
     Results,
@@ -102,26 +109,47 @@ export default {
     async loadChannel() {
       this.loading = true
       try {
-        this.channel = await this.request('youtube.get_channel', {id: this.id})
+        await this.updateChannel(true)
         this.subscribed = await this.request('youtube.is_subscribed', {channel_id: this.id})
       } finally {
         this.loading = false
       }
     },
 
+    async updateChannel(init) {
+      const channel = await this.request(
+        'youtube.get_channel',
+        {id: this.id, next_page_token: this.channel?.next_page_token}
+      )
+
+      const itemsByUrl = this.itemsByUrl || {}
+      let items = channel.items
+        .filter(item => !itemsByUrl[item.url])
+        .map(item => {
+          return {
+            type: 'youtube',
+            ...item,
+          }
+        })
+
+      if (!init) {
+        items = this.channel.items.concat(items)
+      }
+
+      this.channel = channel
+      this.channel.items = items
+    },
+
     async loadNextPage() {
-      if (!this.channel?.next_page_token || this.loadingNextPage)
+      if (!this.channel?.next_page_token || this.loadingNextPage) {
         return
+      }
+
+      this.loadingNextPage = true
 
       try {
-        const nextPage = await this.request(
-          'youtube.get_channel',
-          {id: this.id, next_page_token: this.channel.next_page_token}
-        )
-
-        this.channel.items.push(...nextPage.items.filter(item => !this.itemsByUrl[item.url]))
-        this.channel.next_page_token = nextPage.next_page_token
-        this.$refs.results.maxResultIndex += this.$refs.results.resultIndexStep
+        await this.timeout(500)
+        await this.updateChannel()
       } finally {
         this.loadingNextPage = false
       }
@@ -132,18 +160,6 @@ export default {
       await this.request(`youtube.${action}`, {channel_id: this.id})
       this.subscribed = !this.subscribed
     },
-
-    onScroll(e) {
-      const el = e.target
-      if (!el)
-        return
-
-      const bottom = (el.scrollHeight - el.scrollTop) <= el.clientHeight + 100
-      if (!bottom)
-        return
-
-      this.loadNextPage()
-    },
   },
 
   mounted() {

platypush/backend/http/webapp/src/components/panels/Media/Providers/YouTube/Subscriptions.vue

@@ -20,7 +20,13 @@
     </div>
 
     <div class="subscription-body" v-else>
-      <Channel :id="selectedChannel.id" :filter="filter" @play="$emit('play', $event)" />
+      <Channel
+        :id="selectedChannel.id"
+        :filter="filter"
+        @add-to-playlist="$emit('add-to-playlist', $event)"
+        @download="$emit('download', $event)"
+        @play="$emit('play', $event)"
+      />
     </div>
   </div>
 </template>
@@ -32,8 +38,14 @@ import Loading from "@/components/Loading";
 import Utils from "@/Utils";
 
 export default {
-  emits: ['play', 'select'],
   mixins: [Utils],
+  emits: [
+    'add-to-playlist',
+    'download',
+    'play',
+    'select',
+  ],
+
   components: {
     Channel,
     Loading,

platypush/backend/http/webapp/src/components/panels/Media/Results.vue

@@ -90,14 +90,18 @@ export default {
 
   computed: {
     visibleResults() {
-      return this.results
+      let results = this.results
         .filter((item) => {
-          if (!this.filter)
+          if (!this.filter?.length)
             return true
 
           return item.title.toLowerCase().includes(this.filter.toLowerCase())
         })
-        .slice(0, this.maxResultIndex)
+
+      if (this.maxResultIndex != null)
+        results = results.slice(0, this.maxResultIndex)
+
+      return results
     },
   },
 
@@ -112,7 +116,9 @@ export default {
         return
 
       this.$emit('scroll-end')
-      this.maxResultIndex += this.resultIndexStep
+
+      if (this.resultIndexStep != null)
+        this.maxResultIndex += this.resultIndexStep
     },
   },