Add a factory for PreviewPositionHelper

Enables testing as well as serves as a way to convey to clients that it
is stateful and hence a factory may need to be used to get a new object
for distinct invocations.

Bug: 399641570
Flag: EXEMPT BUGFIX
Test: N/A
Change-Id: I8411c4f8ef110128f9d59a24a5b5705bbf9abf7b

1 files changed, 15 insertions, 0 deletions

diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/PreviewPositionHelper.java b/packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/PreviewPositionHelper.java
index ea7321627322..b8cd5bec2cbe 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/PreviewPositionHelper.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/PreviewPositionHelper.java
@@ -208,4 +208,19 @@ public class PreviewPositionHelper {
         }
         mMatrix.postTranslate(translateX, translateY);
     }
+
+    /**
+     * A factory that returns a new instance of the {@link PreviewPositionHelper}.
+     * <p>{@link PreviewPositionHelper} is a stateful helper, and hence when using it in distinct
+     * scenarios, prefer fetching an object using this factory</p>
+     * <p>Additionally, helpful for injecting mocks in tests</p>
+     */
+    public static class PreviewPositionHelperFactory {
+        /**
+         * Returns a new {@link PreviewPositionHelper} for use in a distinct scenario.
+         */
+        public PreviewPositionHelper create() {
+            return new PreviewPositionHelper();
+        }
+    }
 }