Add support for render mode SHRINK for AccessibilityRenderExtension

Author: geoff-powell

paparazzi/src/main/java/app/cash/paparazzi/accessibility/AccessibilityRenderExtension.kt

@@ -40,16 +40,17 @@ public class AccessibilityRenderExtension : RenderExtension {
       orientation = LinearLayout.HORIZONTAL
       weightSum = 2f
       layoutParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
+      isMeasureWithLargestChildEnabled = true // Allows for snapshot with SHRINK render mode
 
       val overlay = AccessibilityOverlayView(context).apply {
         addView(contentView, FrameLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT))
       }
 
       val contentLayoutParams = contentView.layoutParams ?: generateLayoutParams(null)
-      addView(overlay, LinearLayout.LayoutParams(contentLayoutParams.width, contentLayoutParams.height, 1f))
+      addView(overlay, LinearLayout.LayoutParams(0, contentLayoutParams.height, 1f))
 
       val overlayDetailsView = AccessibilityOverlayDetailsView(context)
-      addView(overlayDetailsView, LinearLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT, 1f))
+      addView(overlayDetailsView, LinearLayout.LayoutParams(0, MATCH_PARENT, 1f))
 
       OneShotPreDrawListener.add(this) {
         val elements = buildList {

paparazzi/src/test/java/app/cash/paparazzi/accessibility/AccessibilityRenderExtensionShrinkTest.kt

@@ -0,0 +1,60 @@
+package app.cash.paparazzi.accessibility
+
+import android.widget.TextView
+import app.cash.paparazzi.DeviceConfig
+import app.cash.paparazzi.Paparazzi
+import app.cash.paparazzi.Snapshot
+import app.cash.paparazzi.SnapshotHandler
+import app.cash.paparazzi.internal.ImageUtils
+import com.android.ide.common.rendering.api.SessionParams
+import org.junit.Rule
+import org.junit.Test
+import java.awt.image.BufferedImage
+import java.io.File
+import javax.imageio.ImageIO
+
+class AccessibilityRenderExtensionShrinkTest {
+  private val snapshotHandler = TestSnapshotVerifier()
+
+  @get:Rule
+  val paparazzi = Paparazzi(
+    deviceConfig = DeviceConfig.NEXUS_5,
+    snapshotHandler = snapshotHandler,
+    renderExtensions = setOf(AccessibilityRenderExtension()),
+    renderingMode = SessionParams.RenderingMode.SHRINK
+  )
+
+  @Test
+  fun `verify baseline`() {
+    val view = TextView(paparazzi.context).apply {
+      id = 1
+      text = "Text View Sample"
+      setPadding(50, 50, 50, 50)
+    }
+    paparazzi.snapshot(view, name = "accessibility-shrink")
+  }
+
+  private class TestSnapshotVerifier : SnapshotHandler {
+    override fun newFrameHandler(
+      snapshot: Snapshot,
+      frameCount: Int,
+      fps: Int
+    ): SnapshotHandler.FrameHandler {
+      return object : SnapshotHandler.FrameHandler {
+        override fun handle(image: BufferedImage) {
+          val expected = File("src/test/resources/${snapshot.name}.png")
+          ImageUtils.assertImageSimilar(
+            relativePath = expected.path,
+            image = image,
+            goldenImage = ImageIO.read(expected),
+            maxPercentDifferent = 0.1
+          )
+        }
+
+        override fun close() = Unit
+      }
+    }
+
+    override fun close() = Unit
+  }
+}