[dfplayer] Use register_apply_condition for dfplayer.is_playing (#19701)

esphome/components/dfplayer/__init__.py

@@ -12,9 +12,6 @@ CODEOWNERS = ["@glmnet"]
 
 dfplayer_ns = cg.esphome_ns.namespace("dfplayer")
 DFPlayer = dfplayer_ns.class_("DFPlayer", cg.Component)
-DFPlayerIsPlayingCondition = dfplayer_ns.class_(
-    "DFPlayerIsPlayingCondition", automation.Condition
-)
 
 MULTI_CONF = True
 CONF_FOLDER = "folder"
@@ -199,12 +196,12 @@ automation.register_apply_action(
 )
 
 
-automation.register_parented_condition(
+automation.register_apply_condition(
     "dfplayer.is_playing",
-    DFPlayerIsPlayingCondition,
     cv.Schema(
         {
             cv.GenerateID(): cv.use_id(DFPlayer),
         }
     ),
+    "is_playing()",
 )

esphome/components/dfplayer/dfplayer.h

@@ -77,9 +77,4 @@ class DFPlayer final : public uart::UARTDevice, public Component {
   CallbackManager<void()> on_finished_playback_callback_;
 };
 
-template<typename... Ts> class DFPlayerIsPlayingCondition final : public Condition<Ts...>, public Parented<DFPlayer> {
- public:
-  bool check(const Ts &...x) override { return this->parent_->is_playing(); }
-};
-
 }  // namespace esphome::dfplayer