Disabling OverviewActionsView buttons while scrolling or clear all shown.

Bug: 153469850, 153387526
Video: https://drive.google.com/a/google.com/file/d/1mOc8yubux92iKtXRtSOKTcnjWWzvDgC7/view?usp=sharing

Change-Id: Id507d3a050e67057fc34a30771c9566ddfcf94ca

quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java

@@ -123,6 +123,7 @@ import com.android.quickstep.TaskThumbnailCache;
 import com.android.quickstep.TaskUtils;
 import com.android.quickstep.ViewUtils;
 import com.android.quickstep.util.AppWindowAnimationHelper;
+import com.android.quickstep.util.LayoutUtils;
 import com.android.quickstep.util.RecentsOrientedState;
 import com.android.quickstep.util.WindowSizeStrategy;
 import com.android.systemui.plugins.ResourceProvider;
@@ -597,9 +598,18 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
         }
     }
 
+    @Override
+    protected void onPageBeginTransition() {
+        super.onPageBeginTransition();
+        LayoutUtils.setViewEnabled(mActionsView, false);
+    }
+
     @Override
     protected void onPageEndTransition() {
         super.onPageEndTransition();
+        if (getScrollX() == getScrollForPage(getPageNearestToCenterOfScreen())) {
+            LayoutUtils.setViewEnabled(mActionsView, true);
+        }
         if (getNextPage() > 0) {
             setSwipeDownShouldLaunchApp(true);
         }
@@ -958,6 +968,7 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
         setCurrentPage(0);
         mDwbToastShown = false;
         mActivity.getSystemUiController().updateUiState(UI_STATE_OVERVIEW, 0);
+        LayoutUtils.setViewEnabled(mActionsView, true);
     }
 
     public @Nullable TaskView getRunningTaskView() {

quickstep/res/values/styles.xml

@@ -79,8 +79,8 @@
 
     <style name="OverviewActionButton"
         parent="@android:style/Widget.DeviceDefault.Button.Borderless">
-        <item name="android:textColor">?attr/workspaceTextColor</item>
-        <item name="android:drawableTint">?attr/workspaceTextColor</item>
+        <item name="android:textColor">@color/overview_button</item>
+        <item name="android:drawableTint">@color/overview_button</item>
         <item name="android:tint">?attr/workspaceTextColor</item>
         <item name="android:drawablePadding">4dp</item>
         <item name="android:textAllCaps">false</item>

quickstep/src/com/android/quickstep/util/LayoutUtils.java

@@ -21,6 +21,8 @@ import static com.android.quickstep.util.WindowSizeStrategy.LAUNCHER_ACTIVITY_SI
 
 import android.content.Context;
 import android.graphics.Rect;
+import android.view.View;
+import android.view.ViewGroup;
 
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.R;
@@ -66,4 +68,21 @@ public class LayoutUtils {
             return srcHeight / targetHeight;
         }
     }
+
+    /**
+     * Recursively sets view and all children enabled/disabled.
+     * @param viewGroup Top most parent view to change.
+     * @param enabled True = enable, False = disable.
+     */
+    public static void setViewEnabled(ViewGroup viewGroup, boolean enabled) {
+        viewGroup.setEnabled(enabled);
+        for (int i = 0; i < viewGroup.getChildCount(); i++) {
+            View child = viewGroup.getChildAt(i);
+            if (child instanceof ViewGroup) {
+                setViewEnabled((ViewGroup) child, enabled);
+            } else {
+                child.setEnabled(enabled);
+            }
+        }
+    }
 }

res/color/overview_button.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:alpha="1"
+        android:color="?attr/workspaceTextColor"
+        android:state_enabled="true" />
+    <item
+        android:alpha="?android:disabledAlpha"
+        android:color="?attr/workspaceTextColor"
+        android:state_enabled="false" />
+</selector>