Merge pull request #32021 from Calinou/editor-audio-bus-snapping

Implement snapping in the audio bus editor

editor/editor_audio_buses.cpp

@@ -31,6 +31,7 @@
 #include "editor_audio_buses.h"
 
 #include "core/io/resource_saver.h"
+#include "core/os/input.h"
 #include "core/os/keyboard.h"
 #include "editor_node.h"
 #include "filesystem_dock.h"
@@ -321,7 +322,13 @@ void EditorAudioBus::_volume_changed(float p_normalized) {
 
 	updating_bus = true;
 
-	float p_db = this->_normalized_volume_to_scaled_db(p_normalized);
+	const float p_db = this->_normalized_volume_to_scaled_db(p_normalized);
+
+	if (Input::get_singleton()->is_key_pressed(KEY_CONTROL)) {
+		// Snap the value when holding Ctrl for easier editing.
+		// To do so, it needs to be converted back to normalized volume (as the slider uses that unit).
+		slider->set_value(_scaled_db_to_normalized_volume(Math::round(p_db)));
+	}
 
 	UndoRedo *ur = EditorNode::get_undo_redo();
 	ur->create_action(TTR("Change Audio Bus Volume"), UndoRedo::MERGE_ENDS);
@@ -376,15 +383,24 @@ float EditorAudioBus::_scaled_db_to_normalized_volume(float db) {
 }
 
 void EditorAudioBus::_show_value(float slider_value) {
-	String text = vformat("%10.1f dB", _normalized_volume_to_scaled_db(slider_value));
+
+	float db;
+	if (Input::get_singleton()->is_key_pressed(KEY_CONTROL)) {
+		// Display the correct (snapped) value when holding Ctrl
+		db = Math::round(_normalized_volume_to_scaled_db(slider_value));
+	} else {
+		db = _normalized_volume_to_scaled_db(slider_value);
+	}
+
+	String text = vformat("%10.1f dB", db);
 
 	slider->set_tooltip(text);
 	audio_value_preview_label->set_text(text);
 	Vector2 slider_size = slider->get_size();
 	Vector2 slider_position = slider->get_global_position();
 	float left_padding = 5.0f;
 	float vert_padding = 10.0f;
-	Vector2 box_position = Vector2(slider_size.x + left_padding, (slider_size.y - vert_padding) * (1.0f - slider_value) - vert_padding);
+	Vector2 box_position = Vector2(slider_size.x + left_padding, (slider_size.y - vert_padding) * (1.0f - slider->get_value()) - vert_padding);
 	audio_value_preview_box->set_position(slider_position + box_position);
 	audio_value_preview_box->set_size(audio_value_preview_label->get_size());
 	if (slider->has_focus() && !audio_value_preview_box->is_visible()) {