Added withResponsiveImagesIf() on Media Conversions

docs/responsive-images/getting-started-with-responsive-images.md

@@ -85,8 +85,18 @@ $yourModel
    ->toMediaCollection();
 ```
 
-Behind the scenes, the media library will generate multiple size variations of your image. To learn which variations are generated and how to customize head over [here](/laravel-medialibrary/v9/responsive-images/using-your-own-width-calculator).
+You can also use it on the conversions.
+
+```php
+$this->addMediaConversion('thumb')
+	->width(368)
+	->height(232)
+	->withResponsiveImages()
+   // or if you want to add it based on a condition then use
+   ->withResponsiveImagesIf($condition); // accepts "closure or boolean"
+```
 
+Behind the scenes, the media library will generate multiple size variations of your image. To learn which variations are generated and how to customize head over [here](/laravel-medialibrary/v9/responsive-images/using-your-own-width-calculator).
 
 ### Displaying responsive images
 

src/Conversions/Conversion.php

@@ -57,7 +57,7 @@ public function getName(): string
 
     public function getPerformOnCollections(): array
     {
-        if (! count($this->performOnCollections)) {
+        if (!count($this->performOnCollections)) {
             return ['default'];
         }
 
@@ -109,7 +109,7 @@ public function withoutManipulations(): self
 
     public function __call($name, $arguments)
     {
-        if (! method_exists($this->manipulations, $name)) {
+        if (!method_exists($this->manipulations, $name)) {
             throw new BadMethodCallException("Manipulation `{$name}` does not exist");
         }
 
@@ -152,7 +152,7 @@ public function performOnCollections(...$collectionNames): self
     public function shouldBePerformedOn(string $collectionName): bool
     {
         //if no collections were specified, perform conversion on all collections
-        if (! count($this->performOnCollections)) {
+        if (!count($this->performOnCollections)) {
             return true;
         }
 
@@ -191,6 +191,13 @@ public function withResponsiveImages(): self
         return $this;
     }
 
+    public function withResponsiveImagesIf($condition): self
+    {
+        $this->generateResponsiveImages = (bool) (is_callable($condition) ? $condition() : $condition);
+
+        return $this;
+    }
+
     public function shouldGenerateResponsiveImages(): bool
     {
         return $this->generateResponsiveImages;