Set system gesture exclusions for the WebView

The maximum allowed height (200dp) is excluded from system gestures at the center of the screen to allow opening the side drawer with a swipe gesture

app/src/main/java/org/jellyfin/mobile/WebappActivity.kt

@@ -5,6 +5,8 @@ import android.app.Service
 import android.content.ComponentName
 import android.content.Intent
 import android.content.ServiceConnection
+import android.graphics.Rect
+import android.os.Build
 import android.os.Bundle
 import android.os.IBinder
 import android.view.OrientationEventListener
@@ -13,6 +15,7 @@ import android.widget.FrameLayout
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import androidx.core.view.ViewCompat
+import androidx.core.view.doOnNextLayout
 import androidx.core.view.updatePadding
 import okhttp3.OkHttpClient
 import org.jellyfin.mobile.bridge.Commands.triggerInputManagerAction
@@ -63,6 +66,13 @@ class WebappActivity : AppCompatActivity(), WebViewController {
             v.updatePadding(top = insets.systemWindowInsets.top)
             insets
         }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            webView.doOnNextLayout { webView ->
+                val verticalCenter = webView.measuredHeight / 2
+                val offset = dip(100)
+                webView.systemGestureExclusionRects = listOf(Rect(0, verticalCenter - offset, dip(96), verticalCenter + offset))
+            }
+        }
 
         // Setup WebView
         webView.initialize()

app/src/main/java/org/jellyfin/mobile/utils/UIExtensions.kt

@@ -46,6 +46,8 @@ fun Activity.disableFullscreen(keepStableLayout: Boolean = false) {
     }
 }
 
+inline fun Context.dip(px: Int) = (px * resources.displayMetrics.density).toInt()
+
 inline fun Context.toast(@StringRes text: Int, duration: Int = Toast.LENGTH_SHORT) =
     Toast.makeText(this, text, duration).show()