Fix weather clock clipped when swiping in Lockscreen

The cause is that layer will be clipped to the bound when alpha < 1.0

Test: atest KeyguardClockSwitchControllerTest, KeyguardStatusViewTest
Bug: 279487893

Change-Id: I38929ee87c1025a2b863b2092e5cab41c6f9419f

packages/SystemUI/src/com/android/keyguard/KeyguardClockSwitchController.java

@@ -178,6 +178,20 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
         }
     }
 
+    /**
+     * Set alpha directly to mView will clip clock, so we set alpha to clock face instead
+     */
+    public void setAlpha(float alpha) {
+        ClockController clock = getClock();
+        if (clock != null) {
+            clock.getLargeClock().getView().setAlpha(alpha);
+            clock.getSmallClock().getView().setAlpha(alpha);
+        }
+        if (mStatusArea != null) {
+            mStatusArea.setAlpha(alpha);
+        }
+    }
+
     /**
      * Attach the controller to the view it relates to.
      */

packages/SystemUI/src/com/android/keyguard/KeyguardStatusView.java

@@ -135,4 +135,29 @@ public class KeyguardStatusView extends GridLayout {
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         Trace.endSection();
     }
+
+
+    /**
+     * Clock content will be clipped when goes beyond bounds,
+     * so we setAlpha for all views except clock
+     */
+    public void setAlpha(float alpha, boolean excludeClock) {
+        if (!excludeClock) {
+            setAlpha(alpha);
+            return;
+        }
+        for (int i = 0; i < getChildCount(); i++) {
+            View child = getChildAt(i);
+            if (child == mStatusViewContainer) {
+                for (int j = 0; j < mStatusViewContainer.getChildCount(); j++) {
+                    View innerChild = mStatusViewContainer.getChildAt(j);
+                    if (innerChild != mClockView) {
+                        innerChild.setAlpha(alpha);
+                    }
+                }
+            } else {
+                child.setAlpha(alpha);
+            }
+        }
+    }
 }

packages/SystemUI/src/com/android/keyguard/KeyguardStatusViewController.java

@@ -180,7 +180,8 @@ public class KeyguardStatusViewController extends ViewController<KeyguardStatusV
      */
     public void setAlpha(float alpha) {
         if (!mKeyguardVisibilityHelper.isVisibilityAnimating()) {
-            mView.setAlpha(alpha);
+            mView.setAlpha(alpha, true);
+            mKeyguardClockSwitchController.setAlpha(alpha);
         }
     }
 

packages/SystemUI/tests/src/com/android/keyguard/KeyguardClockSwitchControllerTest.java

@@ -134,6 +134,7 @@ public class KeyguardClockSwitchControllerTest extends SysuiTestCase {
 
     private KeyguardClockSwitchController mController;
     private View mSliceView;
+    private LinearLayout mStatusArea;
     private FakeExecutor mExecutor;
 
     @Before
@@ -195,8 +196,8 @@ public class KeyguardClockSwitchControllerTest extends SysuiTestCase {
 
         mSliceView = new View(getContext());
         when(mView.findViewById(R.id.keyguard_slice_view)).thenReturn(mSliceView);
-        when(mView.findViewById(R.id.keyguard_status_area)).thenReturn(
-                new LinearLayout(getContext()));
+        mStatusArea = new LinearLayout(getContext());
+        when(mView.findViewById(R.id.keyguard_status_area)).thenReturn(mStatusArea);
     }
 
     @Test
@@ -401,6 +402,15 @@ public class KeyguardClockSwitchControllerTest extends SysuiTestCase {
         assertNull(mController.getClock());
     }
 
+    @Test
+    public void testSetAlpha_setClockAlphaForCLockFace() {
+        mController.onViewAttached();
+        mController.setAlpha(0.5f);
+        verify(mLargeClockView).setAlpha(0.5f);
+        verify(mSmallClockView).setAlpha(0.5f);
+        assertEquals(0.5f, mStatusArea.getAlpha(), 0.0f);
+    }
+
     private void verifyAttachment(VerificationMode times) {
         verify(mClockRegistry, times).registerClockChangeListener(
                 any(ClockRegistry.ClockChangeListener.class));

packages/SystemUI/tests/src/com/android/keyguard/KeyguardStatusViewTest.kt

@@ -24,6 +24,8 @@ class KeyguardStatusViewTest : SysuiTestCase() {
         get() = keyguardStatusView.findViewById(R.id.status_view_media_container)
     private val statusViewContainer: ViewGroup
         get() = keyguardStatusView.findViewById(R.id.status_view_container)
+    private val clockView: ViewGroup
+        get() = keyguardStatusView.findViewById(R.id.keyguard_clock_container)
     private val childrenExcludingMedia
         get() = statusViewContainer.children.filter { it != mediaView }
 
@@ -56,4 +58,12 @@ class KeyguardStatusViewTest : SysuiTestCase() {
             assertThat(it.translationY).isEqualTo(translationY)
         }
     }
+
+    @Test
+    fun setAlphaExcludeClock() {
+        keyguardStatusView.setAlpha(0.5f, /* excludeClock= */true)
+        assertThat(statusViewContainer.alpha).isNotEqualTo(0.5f)
+        assertThat(mediaView.alpha).isEqualTo(0.5f)
+        assertThat(clockView.alpha).isNotEqualTo(0.5f)
+    }
 }