Subsonic: Add button to delete songs

Fixes #883

src/collection/collectionbackend.cpp

@@ -1801,6 +1801,12 @@ void CollectionBackend::ResetStatistics(const int id) {
 
 }
 
+void CollectionBackend::DeleteAllAsync() {
+
+  QMetaObject::invokeMethod(this, "DeleteAll", Qt::QueuedConnection);
+
+}
+
 void CollectionBackend::DeleteAll() {
 
   {

src/collection/collectionbackend.h

@@ -197,7 +197,7 @@ class CollectionBackend : public CollectionBackendInterface {
   void IncrementSkipCountAsync(const int id, const float progress);
   void ResetStatisticsAsync(const int id);
 
-  void DeleteAll();
+  void DeleteAllAsync();
 
   Song GetSongBySongId(const QString &song_id);
   SongList GetSongsBySongId(const QStringList &song_ids);
@@ -234,6 +234,7 @@ class CollectionBackend : public CollectionBackendInterface {
   void IncrementPlayCount(const int id);
   void IncrementSkipCount(const int id, const float progress);
   void ResetStatistics(const int id);
+  void DeleteAll();
   void SongPathChanged(const Song &song, const QFileInfo &new_file, const std::optional<int> new_collection_directory_id);
 
   SongList GetSongsBy(const QString &artist, const QString &album, const QString &title);

src/settings/subsonicsettingspage.cpp

@@ -50,6 +50,7 @@ SubsonicSettingsPage::SubsonicSettingsPage(SettingsDialog *dialog, QWidget *pare
   setWindowIcon(IconLoader::Load("subsonic"));
 
   QObject::connect(ui_->button_test, &QPushButton::clicked, this, &SubsonicSettingsPage::TestClicked);
+  QObject::connect(ui_->button_deletesongs, &QPushButton::clicked, service_, &SubsonicService::DeleteSongs);
 
   QObject::connect(this, &SubsonicSettingsPage::Test, service_, &SubsonicService::SendPingWithCredentials);
 

src/settings/subsonicsettingspage.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>460</width>
-    <height>644</height>
+    <height>749</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -144,13 +144,6 @@
      </layout>
     </widget>
    </item>
-   <item>
-    <widget class="QPushButton" name="button_test">
-     <property name="text">
-      <string>Test</string>
-     </property>
-    </widget>
-   </item>
    <item>
     <widget class="QGroupBox" name="groupbox_preferences">
      <property name="title">
@@ -188,6 +181,42 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <widget class="QGroupBox" name="groupbox_tools">
+     <property name="title">
+      <string/>
+     </property>
+     <layout class="QGridLayout" name="gridLayout">
+      <item row="0" column="2">
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="0" column="0">
+       <widget class="QPushButton" name="button_test">
+        <property name="text">
+         <string>Test</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QPushButton" name="button_deletesongs">
+        <property name="text">
+         <string>Delete songs</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
    <item>
     <spacer name="spacer_middle">
      <property name="orientation">
@@ -244,7 +273,6 @@
   <tabstop>server_url</tabstop>
   <tabstop>username</tabstop>
   <tabstop>password</tabstop>
-  <tabstop>button_test</tabstop>
   <tabstop>checkbox_verify_certificate</tabstop>
   <tabstop>checkbox_download_album_covers</tabstop>
  </tabstops>

src/subsonic/subsonicservice.cpp

@@ -446,6 +446,12 @@ void SubsonicService::GetSongs() {
 
 }
 
+void SubsonicService::DeleteSongs() {
+
+  collection_backend_->DeleteAllAsync();
+
+}
+
 void SubsonicService::SongsResultsReceived(const SongMap &songs, const QString &error) {
 
   emit SongsResults(songs, error);

src/subsonic/subsonicservice.h

@@ -92,6 +92,7 @@ class SubsonicService : public InternetService {
   void SendPing();
   void SendPingWithCredentials(QUrl url, const QString &username, const QString &password, const SubsonicSettingsPage::AuthMethod auth_method, const bool redirect = false);
   void GetSongs() override;
+  void DeleteSongs();
   void ResetSongsRequest() override;
 
  private slots: