Reduce noise in asset processing example (#10262)

# Objective

- Reduce noise to allow users to see previous asset changes and other
logs like from asset reloading
- The example file is named differently than the example

## Solution

- Only print the asset content if there are asset events
- Rename the example file to `asset_processing`

Cargo.toml

@@ -1102,7 +1102,7 @@ wasm = true
 
 [[example]]
 name = "asset_processing"
-path = "examples/asset/processing/processing.rs"
+path = "examples/asset/processing/asset_processing.rs"
 doc-scrape-examples = true
 required-features = ["file_watcher", "asset_processor"]
 

examples/README.md

@@ -180,7 +180,7 @@ Example | Description
 Example | Description
 --- | ---
 [Asset Loading](../examples/asset/asset_loading.rs) | Demonstrates various methods to load assets
-[Asset Processing](../examples/asset/processing/processing.rs) | Demonstrates how to process and load custom assets
+[Asset Processing](../examples/asset/processing/asset_processing.rs) | Demonstrates how to process and load custom assets
 [Custom Asset](../examples/asset/custom_asset.rs) | Implements a custom asset loader
 [Custom Asset IO](../examples/asset/custom_asset_reader.rs) | Implements a custom AssetReader
 [Hot Reloading of Assets](../examples/asset/hot_asset_reloading.rs) | Demonstrates automatic reloading of assets when modified on disk

examples/asset/processing/asset_processing.rs

@@ -217,7 +217,12 @@ fn setup(mut commands: Commands, assets: Res<AssetServer>) {
     });
 }
 
-fn print_text(handles: Res<TextAssets>, texts: Res<Assets<Text>>) {
+fn print_text(
+    handles: Res<TextAssets>,
+    texts: Res<Assets<Text>>,
+    mut asset_events: EventReader<AssetEvent<Text>>,
+) {
+    if !asset_events.is_empty() {
         // This prints the current values of the assets
         // Hot-reloading is supported, so try modifying the source assets (and their meta files)!
         println!("Current Values:");
@@ -228,4 +233,6 @@ fn print_text(handles: Res<TextAssets>, texts: Res<Assets<Text>>) {
         println!("  e: {:?}", texts.get(&handles.e));
         println!("(You can modify source assets and their .meta files to hot-reload changes!)");
         println!();
+        asset_events.clear();
+    }
 }