emulate_media_type function (#232)

* Added emulate_media_type function

See: https://chromedevtools.github.io/devtools-protocol/tot/Emulation/#method-setEmulatedMedia
(media is unused in function emulate_media_features)

Also See: https://pptr.dev/api/puppeteer.page.emulatemediatype
This is basically the newly implemented function

* rustfmt

---------

Co-authored-by: Matthias Seitz <[email protected]>

src/page.rs

@@ -644,6 +644,21 @@ impl Page {
         Ok(self)
     }
 
+    /// Changes the CSS media type of the page
+    // Based on https://pptr.dev/api/puppeteer.page.emulatemediatype
+    pub async fn emulate_media_type(
+        &self,
+        media_type: impl Into<MediaTypeParams>,
+    ) -> Result<&Self> {
+        self.execute(
+            SetEmulatedMediaParams::builder()
+                .media(media_type.into())
+                .build(),
+        )
+        .await?;
+        Ok(self)
+    }
+
     /// Overrides default host system timezone
     pub async fn emulate_timezone(
         &self,
@@ -1348,3 +1363,23 @@ impl From<CaptureScreenshotParams> for ScreenshotParams {
         }
     }
 }
+
+#[derive(Debug, Clone, Copy, Default)]
+pub enum MediaTypeParams {
+    /// Default CSS media type behavior for page and print
+    #[default]
+    Null,
+    /// Force screen CSS media type for page and print
+    Screen,
+    /// Force print CSS media type for page and print
+    Print,
+}
+impl From<MediaTypeParams> for String {
+    fn from(media_type: MediaTypeParams) -> Self {
+        match media_type {
+            MediaTypeParams::Null => "null".to_string(),
+            MediaTypeParams::Screen => "screen".to_string(),
+            MediaTypeParams::Print => "print".to_string(),
+        }
+    }
+}