[Fixed] Reverse scrolling setting is reversed

If useTouchpadNaturalScrolling is false, "Reverse scrolling" should be on.

[The API value]
useTouchpadNaturalScrolling: false

[The expected UX behavior]
Reverse scrolling: on
fingers upward, scroll up, content moves down

The description of "useTouchpadNaturalScrolling":
Returns true if moving two fingers upwards on the touchpad should scroll down, which is known as natural scrolling.

The description of "Reverse scrolling":
Content moves up when you scroll down.

Bug: 280047007
Test: manual and passed atest TrackpadReverseScrollingPreferenceControllerTest
Change-Id: Ia5e30fa14b599ddcffae99005114f10412ccad3c

src/com/android/settings/inputmethod/TrackpadReverseScrollingPreferenceController.java

@@ -30,12 +30,12 @@ public class TrackpadReverseScrollingPreferenceController extends TogglePreferen
 
     @Override
     public boolean isChecked() {
-        return InputSettings.useTouchpadNaturalScrolling(mContext);
+        return !InputSettings.useTouchpadNaturalScrolling(mContext);
     }
 
     @Override
     public boolean setChecked(boolean isChecked) {
-        InputSettings.setTouchpadNaturalScrolling(mContext, isChecked);
+        InputSettings.setTouchpadNaturalScrolling(mContext, !isChecked);
         return true;
     }
 

tests/robotests/src/com/android/settings/inputmethod/TrackpadReverseScrollingPreferenceControllerTest.java

@@ -61,22 +61,9 @@ public class TrackpadReverseScrollingPreferenceControllerTest {
     }
 
     @Test
-    public void setChecked_true_shouldReturn1() {
+    public void setChecked_true_shouldReturn0() {
         mController.setChecked(true);
 
-        int result = Settings.System.getIntForUser(
-                mContext.getContentResolver(),
-                SETTING_KEY,
-                0,
-                UserHandle.USER_CURRENT);
-
-        assertThat(result).isEqualTo(1);
-    }
-
-    @Test
-    public void setChecked_false_shouldReturn0() {
-        mController.setChecked(false);
-
         int result = Settings.System.getIntForUser(
                 mContext.getContentResolver(),
                 SETTING_KEY,
@@ -87,7 +74,20 @@ public class TrackpadReverseScrollingPreferenceControllerTest {
     }
 
     @Test
-    public void isChecked_providerPutInt1_returnTrue() {
+    public void setChecked_false_shouldReturn1() {
+        mController.setChecked(false);
+
+        int result = Settings.System.getIntForUser(
+                mContext.getContentResolver(),
+                SETTING_KEY,
+                0,
+                UserHandle.USER_CURRENT);
+
+        assertThat(result).isEqualTo(1);
+    }
+
+    @Test
+    public void isChecked_providerPutInt1_returnFalse() {
         Settings.System.putIntForUser(
                 mContext.getContentResolver(),
                 SETTING_KEY,
@@ -96,11 +96,11 @@ public class TrackpadReverseScrollingPreferenceControllerTest {
 
         boolean result = mController.isChecked();
 
-        assertThat(result).isTrue();
+        assertThat(result).isFalse();
     }
 
     @Test
-    public void isChecked_providerPutInt0_returnFalse() {
+    public void isChecked_providerPutInt0_returnTrue() {
         Settings.System.putIntForUser(
                 mContext.getContentResolver(),
                 SETTING_KEY,
@@ -109,6 +109,6 @@ public class TrackpadReverseScrollingPreferenceControllerTest {
 
         boolean result = mController.isChecked();
 
-        assertThat(result).isFalse();
+        assertThat(result).isTrue();
     }
 }