Adds ENABLE_FLOATING_SEARCH_BOX flag for All Apps.

This defines how the All Apps screen should be laid out without
anchoring to the search bar at the top, as follows:
 - Header view aligns to the top instead of below search bar.
 - Same for A-Z list.
 - Scroller is aligned to the header view to receive the above
   adjustments automatically.
 - A-Z list is set above search bar to not peek from below.
 - Search bar is set to align parent bottom and translates up
   with the keyboard.
 - Button to disable work apps is raised above the search bar.

Bug: 213954333
Test: Manually with flag enabled/disabled, Always show keyboard
enabled/disabled, and work profile enabled/disabled.

Change-Id: If90bb39a890029fa7056367fe62bad0677f0b86e

src/com/android/launcher3/allapps/ActivityAllAppsContainerView.java

@@ -21,6 +21,7 @@ import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
+import android.widget.RelativeLayout;
 
 import androidx.core.graphics.ColorUtils;
 import androidx.recyclerview.widget.RecyclerView;
@@ -176,6 +177,28 @@ public class ActivityAllAppsContainerView<T extends BaseDraggingActivity> extend
                 });
     }
 
+    @Override
+    protected View replaceRVContainer(boolean showTabs) {
+        View rvContainer = super.replaceRVContainer(showTabs);
+        if (FeatureFlags.ENABLE_FLOATING_SEARCH_BAR.get()) {
+            alignParentTop(rvContainer);
+            layoutAboveSearchContainer(rvContainer);
+        } else {
+            layoutBelowSearchContainer(rvContainer);
+        }
+        return rvContainer;
+    }
+
+    @Override
+    void setupHeader() {
+        super.setupHeader();
+        if (FeatureFlags.ENABLE_FLOATING_SEARCH_BAR.get()) {
+            alignParentTop(mHeader);
+        } else {
+            layoutBelowSearchContainer(mHeader);
+        }
+    }
+
     @Override
     protected void updateHeaderScroll(int scrolledOffset) {
         super.updateHeaderScroll(scrolledOffset);
@@ -202,6 +225,36 @@ public class ActivityAllAppsContainerView<T extends BaseDraggingActivity> extend
 
     @Override
     protected int getHeaderBottom() {
+        if (FeatureFlags.ENABLE_FLOATING_SEARCH_BAR.get()) {
+            return super.getHeaderBottom();
+        }
         return super.getHeaderBottom() + mSearchContainer.getBottom();
     }
+
+    private void layoutBelowSearchContainer(View v) {
+        if (!(v.getLayoutParams() instanceof RelativeLayout.LayoutParams)) {
+            return;
+        }
+        RelativeLayout.LayoutParams layoutParams = (LayoutParams) v.getLayoutParams();
+        layoutParams.removeRule(RelativeLayout.ALIGN_PARENT_TOP);
+        layoutParams.removeRule(RelativeLayout.ABOVE);
+        layoutParams.addRule(RelativeLayout.BELOW, R.id.search_container_all_apps);
+    }
+
+    private void layoutAboveSearchContainer(View v) {
+        if (!(v.getLayoutParams() instanceof RelativeLayout.LayoutParams)) {
+            return;
+        }
+        RelativeLayout.LayoutParams layoutParams = (LayoutParams) v.getLayoutParams();
+        layoutParams.addRule(RelativeLayout.ABOVE, R.id.search_container_all_apps);
+    }
+
+    private void alignParentTop(View v) {
+        if (!(v.getLayoutParams() instanceof RelativeLayout.LayoutParams)) {
+            return;
+        }
+        RelativeLayout.LayoutParams layoutParams = (LayoutParams) v.getLayoutParams();
+        layoutParams.removeRule(RelativeLayout.BELOW);
+        layoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
+    }
 }