Add hint for oneshot & warning when it will be updated continuously

11 files changed, 37 insertions, 8 deletions

diff --git a/core/core_constants.cpp b/core/core_constants.cpp
index 25da49fa5c..cdb4f2c800 100644
--- a/core/core_constants.cpp
+++ b/core/core_constants.cpp
@@ -678,6 +678,7 @@ void register_global_constants() {
 	BIND_CORE_ENUM_CONSTANT(PROPERTY_HINT_HIDE_QUATERNION_EDIT);
 	BIND_CORE_ENUM_CONSTANT(PROPERTY_HINT_PASSWORD);
 	BIND_CORE_ENUM_CONSTANT(PROPERTY_HINT_TOOL_BUTTON);
+	BIND_CORE_ENUM_CONSTANT(PROPERTY_HINT_ONESHOT);
 	BIND_CORE_ENUM_CONSTANT(PROPERTY_HINT_MAX);
 
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_NONE);
diff --git a/core/object/object.h b/core/object/object.h
index 110d2790c5..678e0d0d49 100644
--- a/core/object/object.h
+++ b/core/object/object.h
@@ -88,6 +88,7 @@ enum PropertyHint {
 	PROPERTY_HINT_LAYERS_AVOIDANCE,
 	PROPERTY_HINT_DICTIONARY_TYPE,
 	PROPERTY_HINT_TOOL_BUTTON,
+	PROPERTY_HINT_ONESHOT, ///< the property will be changed by self after setting, such as AudioStreamPlayer.playing, Particles.emitting.
 	PROPERTY_HINT_MAX,
 };
 
diff --git a/doc/classes/@GlobalScope.xml b/doc/classes/@GlobalScope.xml
index 55d00b6cf9..90036959ad 100644
--- a/doc/classes/@GlobalScope.xml
+++ b/doc/classes/@GlobalScope.xml
@@ -2941,7 +2941,10 @@
 			[/codeblock]
 			[b]Note:[/b] A [Callable] cannot be properly serialized and stored in a file, so it is recommended to use [constant PROPERTY_USAGE_EDITOR] instead of [constant PROPERTY_USAGE_DEFAULT].
 		</constant>
-		<constant name="PROPERTY_HINT_MAX" value="40" enum="PropertyHint">
+		<constant name="PROPERTY_HINT_ONESHOT" value="40" enum="PropertyHint">
+			Hints that a property will be changed on its own after setting, such as [member AudioStreamPlayer.playing] or [member GPUParticles3D.emitting].
+		</constant>
+		<constant name="PROPERTY_HINT_MAX" value="41" enum="PropertyHint">
 			Represents the size of the [enum PropertyHint] enum.
 		</constant>
 		<constant name="PROPERTY_USAGE_NONE" value="0" enum="PropertyUsageFlags" is_bitfield="true">
diff --git a/scene/2d/audio_stream_player_2d.cpp b/scene/2d/audio_stream_player_2d.cpp
index 7c60e47e64..8aaa230075 100644
--- a/scene/2d/audio_stream_player_2d.cpp
+++ b/scene/2d/audio_stream_player_2d.cpp
@@ -410,7 +410,7 @@ void AudioStreamPlayer2D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "stream", PROPERTY_HINT_RESOURCE_TYPE, "AudioStream"), "set_stream", "get_stream");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volume_db", PROPERTY_HINT_RANGE, "-80,24,suffix:dB"), "set_volume_db", "get_volume_db");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "pitch_scale", PROPERTY_HINT_RANGE, "0.01,4,0.01,or_greater"), "set_pitch_scale", "get_pitch_scale");
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playing", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR), "set_playing", "is_playing");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playing", PROPERTY_HINT_ONESHOT, "", PROPERTY_USAGE_EDITOR), "set_playing", "is_playing");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "autoplay"), "set_autoplay", "is_autoplay_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "stream_paused", PROPERTY_HINT_NONE, ""), "set_stream_paused", "get_stream_paused");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "max_distance", PROPERTY_HINT_RANGE, "1,4096,1,or_greater,exp,suffix:px"), "set_max_distance", "get_max_distance");
diff --git a/scene/2d/cpu_particles_2d.cpp b/scene/2d/cpu_particles_2d.cpp
index 754afb0527..5c1524b211 100644
--- a/scene/2d/cpu_particles_2d.cpp
+++ b/scene/2d/cpu_particles_2d.cpp
@@ -506,6 +506,10 @@ bool CPUParticles2D::get_split_scale() {
 }
 
 void CPUParticles2D::_validate_property(PropertyInfo &p_property) const {
+	if (p_property.name == "emitting") {
+		p_property.hint = one_shot ? PROPERTY_HINT_ONESHOT : PROPERTY_HINT_NONE;
+	}
+
 	if (p_property.name == "emission_sphere_radius" && (emission_shape != EMISSION_SHAPE_SPHERE && emission_shape != EMISSION_SHAPE_SPHERE_SURFACE)) {
 		p_property.usage = PROPERTY_USAGE_NONE;
 	}
@@ -1285,7 +1289,7 @@ void CPUParticles2D::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("restart"), &CPUParticles2D::restart);
 
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting"), "set_emitting", "is_emitting");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting", PROPERTY_HINT_ONESHOT), "set_emitting", "is_emitting");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "amount", PROPERTY_HINT_RANGE, "1,1000000,1,exp"), "set_amount", "get_amount");
 	ADD_GROUP("Time", "");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "lifetime", PROPERTY_HINT_RANGE, "0.01,600.0,0.01,or_greater,exp,suffix:s"), "set_lifetime", "get_lifetime");
diff --git a/scene/2d/gpu_particles_2d.cpp b/scene/2d/gpu_particles_2d.cpp
index cfdcbee86a..c71df49b61 100644
--- a/scene/2d/gpu_particles_2d.cpp
+++ b/scene/2d/gpu_particles_2d.cpp
@@ -384,6 +384,9 @@ Ref<Texture2D> GPUParticles2D::get_texture() const {
 }
 
 void GPUParticles2D::_validate_property(PropertyInfo &p_property) const {
+	if (p_property.name == "emitting") {
+		p_property.hint = one_shot ? PROPERTY_HINT_ONESHOT : PROPERTY_HINT_NONE;
+	}
 }
 
 void GPUParticles2D::emit_particle(const Transform2D &p_transform2d, const Vector2 &p_velocity2d, const Color &p_color, const Color &p_custom, uint32_t p_emit_flags) {
@@ -816,7 +819,7 @@ void GPUParticles2D::_bind_methods() {
 
 	ADD_SIGNAL(MethodInfo("finished"));
 
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting"), "set_emitting", "is_emitting");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting", PROPERTY_HINT_ONESHOT), "set_emitting", "is_emitting");
 	ADD_PROPERTY_DEFAULT("emitting", true); // Workaround for doctool in headless mode, as dummy rasterizer always returns false.
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "amount", PROPERTY_HINT_RANGE, "1,1000000,1,exp"), "set_amount", "get_amount");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "amount_ratio", PROPERTY_HINT_RANGE, "0,1,0.0001"), "set_amount_ratio", "get_amount_ratio");
diff --git a/scene/3d/audio_stream_player_3d.cpp b/scene/3d/audio_stream_player_3d.cpp
index 98bee2115c..eb75650399 100644
--- a/scene/3d/audio_stream_player_3d.cpp
+++ b/scene/3d/audio_stream_player_3d.cpp
@@ -834,7 +834,7 @@ void AudioStreamPlayer3D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "unit_size", PROPERTY_HINT_RANGE, "0.1,100,0.01,or_greater"), "set_unit_size", "get_unit_size");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "max_db", PROPERTY_HINT_RANGE, "-24,6,suffix:dB"), "set_max_db", "get_max_db");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "pitch_scale", PROPERTY_HINT_RANGE, "0.01,4,0.01,or_greater"), "set_pitch_scale", "get_pitch_scale");
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playing", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR), "set_playing", "is_playing");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playing", PROPERTY_HINT_ONESHOT, "", PROPERTY_USAGE_EDITOR), "set_playing", "is_playing");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "autoplay"), "set_autoplay", "is_autoplay_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "stream_paused", PROPERTY_HINT_NONE, ""), "set_stream_paused", "get_stream_paused");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "max_distance", PROPERTY_HINT_RANGE, "0,4096,0.01,or_greater,suffix:m"), "set_max_distance", "get_max_distance");
diff --git a/scene/3d/cpu_particles_3d.cpp b/scene/3d/cpu_particles_3d.cpp
index acbc443a93..b8ad046db8 100644
--- a/scene/3d/cpu_particles_3d.cpp
+++ b/scene/3d/cpu_particles_3d.cpp
@@ -543,6 +543,10 @@ AABB CPUParticles3D::capture_aabb() const {
 }
 
 void CPUParticles3D::_validate_property(PropertyInfo &p_property) const {
+	if (p_property.name == "emitting") {
+		p_property.hint = one_shot ? PROPERTY_HINT_ONESHOT : PROPERTY_HINT_NONE;
+	}
+
 	if (p_property.name == "emission_sphere_radius" && (emission_shape != EMISSION_SHAPE_SPHERE && emission_shape != EMISSION_SHAPE_SPHERE_SURFACE)) {
 		p_property.usage = PROPERTY_USAGE_NONE;
 	}
@@ -1480,7 +1484,7 @@ void CPUParticles3D::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("restart"), &CPUParticles3D::restart);
 
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting"), "set_emitting", "is_emitting");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting", PROPERTY_HINT_ONESHOT), "set_emitting", "is_emitting");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "amount", PROPERTY_HINT_RANGE, "1,1000000,1,exp"), "set_amount", "get_amount");
 	ADD_GROUP("Time", "");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "lifetime", PROPERTY_HINT_RANGE, "0.01,600.0,0.01,or_greater,exp,suffix:s"), "set_lifetime", "get_lifetime");
diff --git a/scene/3d/gpu_particles_3d.cpp b/scene/3d/gpu_particles_3d.cpp
index 2cef607d29..be927c2871 100644
--- a/scene/3d/gpu_particles_3d.cpp
+++ b/scene/3d/gpu_particles_3d.cpp
@@ -414,6 +414,10 @@ AABB GPUParticles3D::capture_aabb() const {
 }
 
 void GPUParticles3D::_validate_property(PropertyInfo &p_property) const {
+	if (p_property.name == "emitting") {
+		p_property.hint = one_shot ? PROPERTY_HINT_ONESHOT : PROPERTY_HINT_NONE;
+	}
+
 	if (p_property.name.begins_with("draw_pass_")) {
 		int index = p_property.name.get_slicec('_', 2).to_int() - 1;
 		if (index >= draw_passes.size()) {
@@ -742,7 +746,7 @@ void GPUParticles3D::_bind_methods() {
 
 	ADD_SIGNAL(MethodInfo("finished"));
 
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting"), "set_emitting", "is_emitting");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "emitting", PROPERTY_HINT_ONESHOT), "set_emitting", "is_emitting");
 	ADD_PROPERTY_DEFAULT("emitting", true); // Workaround for doctool in headless mode, as dummy rasterizer always returns false.
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "amount", PROPERTY_HINT_RANGE, "1,1000000,1,exp"), "set_amount", "get_amount");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "amount_ratio", PROPERTY_HINT_RANGE, "0,1,0.0001"), "set_amount_ratio", "get_amount_ratio");
diff --git a/scene/animation/animation_mixer.cpp b/scene/animation/animation_mixer.cpp
index eb8bc8c382..f41affe581 100644
--- a/scene/animation/animation_mixer.cpp
+++ b/scene/animation/animation_mixer.cpp
@@ -716,6 +716,15 @@ bool AnimationMixer::_update_caches() {
 							}
 						}
 
+						if (is_value && callback_mode_discrete == ANIMATION_CALLBACK_MODE_DISCRETE_FORCE_CONTINUOUS) {
+							if (child) {
+								PropertyInfo prop_info;
+								ClassDB::get_property_info(child->get_class_name(), path.get_concatenated_subnames(), &prop_info);
+								if (prop_info.hint == PROPERTY_HINT_ONESHOT) {
+									WARN_PRINT_ED(vformat("%s: '%s', Value Track: '%s' is oneshot property, but will be continuously updated. Consider setting a value other than ANIMATION_CALLBACK_MODE_DISCRETE_FORCE_CONTINUOUS to AnimationMixer.callback_mode_dominant.", mixer_name, String(E), String(path)));
+								}
+							}
+						}
 					} break;
 					case Animation::TYPE_POSITION_3D:
 					case Animation::TYPE_ROTATION_3D:
diff --git a/scene/audio/audio_stream_player.cpp b/scene/audio/audio_stream_player.cpp
index d4b44a8b69..3996ec9b1e 100644
--- a/scene/audio/audio_stream_player.cpp
+++ b/scene/audio/audio_stream_player.cpp
@@ -262,7 +262,7 @@ void AudioStreamPlayer::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "stream", PROPERTY_HINT_RESOURCE_TYPE, "AudioStream"), "set_stream", "get_stream");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volume_db", PROPERTY_HINT_RANGE, "-80,24,suffix:dB"), "set_volume_db", "get_volume_db");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "pitch_scale", PROPERTY_HINT_RANGE, "0.01,4,0.01,or_greater"), "set_pitch_scale", "get_pitch_scale");
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playing", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR), "set_playing", "is_playing");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playing", PROPERTY_HINT_ONESHOT, "", PROPERTY_USAGE_EDITOR), "set_playing", "is_playing");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "autoplay"), "set_autoplay", "is_autoplay_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "stream_paused", PROPERTY_HINT_NONE, ""), "set_stream_paused", "get_stream_paused");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "mix_target", PROPERTY_HINT_ENUM, "Stereo,Surround,Center"), "set_mix_target", "get_mix_target");