[web] Use named route for playlist pages

Switching to named routes in order to reduce future maintenance.

web-src/src/pages/PagePlaylistTracks.vue

@@ -0,0 +1,101 @@
+<template>
+  <div class="fd-page">
+    <content-with-heading>
+      <template #heading-left>
+        <div class="title is-4" v-text="playlist.name" />
+      </template>
+      <template #heading-right>
+        <div class="buttons is-centered">
+          <a
+            class="button is-small is-light is-rounded"
+            @click="show_playlist_details_modal = true"
+          >
+            <mdicon class="icon" name="dots-horizontal" size="16" />
+          </a>
+          <a class="button is-small is-dark is-rounded" @click="play">
+            <mdicon class="icon" name="shuffle" size="16" />
+            <span v-text="$t('page.playlist.shuffle')" />
+          </a>
+        </div>
+      </template>
+      <template #content>
+        <p
+          class="heading has-text-centered-mobile"
+          v-text="$t('page.playlist.track-count', { count: tracks.count })"
+        />
+        <list-tracks :tracks="tracks" :uris="uris" />
+        <modal-dialog-playlist
+          :show="show_playlist_details_modal"
+          :playlist="playlist"
+          :uris="uris"
+          @close="show_playlist_details_modal = false"
+        />
+      </template>
+    </content-with-heading>
+  </div>
+</template>
+
+<script>
+import ContentWithHeading from '@/templates/ContentWithHeading.vue'
+import { GroupByList } from '@/lib/GroupByList'
+import ListTracks from '@/components/ListTracks.vue'
+import ModalDialogPlaylist from '@/components/ModalDialogPlaylist.vue'
+import webapi from '@/webapi'
+
+const dataObject = {
+  load(to) {
+    return Promise.all([
+      webapi.library_playlist(to.params.id),
+      webapi.library_playlist_tracks(to.params.id)
+    ])
+  },
+
+  set(vm, response) {
+    vm.playlist = response[0].data
+    vm.tracks = new GroupByList(response[1].data)
+  }
+}
+
+export default {
+  name: 'PagePlaylist',
+  components: { ContentWithHeading, ListTracks, ModalDialogPlaylist },
+
+  beforeRouteEnter(to, from, next) {
+    dataObject.load(to).then((response) => {
+      next((vm) => dataObject.set(vm, response))
+    })
+  },
+  beforeRouteUpdate(to, from, next) {
+    const vm = this
+    dataObject.load(to).then((response) => {
+      dataObject.set(vm, response)
+      next()
+    })
+  },
+
+  data() {
+    return {
+      playlist: {},
+      tracks: new GroupByList(),
+      show_playlist_details_modal: false
+    }
+  },
+
+  computed: {
+    uris() {
+      if (this.playlist.random) {
+        return this.tracks.map((a) => a.uri).join(',')
+      }
+      return this.playlist.uri
+    }
+  },
+
+  methods: {
+    play() {
+      webapi.player_play_uri(this.uris, true)
+    }
+  }
+}
+</script>
+
+<style></style>