Fade to empty view when no tasks for Recents Go
This CL adds a view for when there are no tasks and fades into/out of it
appropriately based off changes to the adapter.
Bug: 114136250
Test: Add task, remove task, see empty view shows up properly.
Change-Id: I47d0bbfb19d56f5f0de5bec3c0ac2b5cfb63253f
diff --git a/go/quickstep/res/layout/icon_recents_root_view.xml b/go/quickstep/res/layout/icon_recents_root_view.xml
index 6c50950..ff3dcef9 100644
--- a/go/quickstep/res/layout/icon_recents_root_view.xml
+++ b/go/quickstep/res/layout/icon_recents_root_view.xml
@@ -24,5 +24,15 @@
android:id="@+id/recent_task_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
- android:scrollbars="none"/>
+ android:scrollbars="none"
+ android:visibility="gone"/>
+ <TextView
+ android:id="@+id/recent_task_empty_view"
+ android:layout_width="match_parent"
+ android:layout_height="match_parent"
+ android:gravity="center"
+ android:text="@string/recents_empty_message"
+ android:textColor="@android:color/white"
+ android:textSize="25sp"
+ android:visibility="gone"/>
</com.android.quickstep.views.IconRecentsView>
\ No newline at end of file
diff --git a/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java b/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
index b7740eb..8c7177b 100644
--- a/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
+++ b/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
@@ -17,15 +17,19 @@
import static androidx.recyclerview.widget.LinearLayoutManager.VERTICAL;
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.util.AttributeSet;
import android.util.FloatProperty;
+import android.view.View;
import android.view.ViewDebug;
import android.widget.FrameLayout;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.AdapterDataObserver;
import com.android.launcher3.R;
import com.android.quickstep.TaskAdapter;
@@ -70,6 +74,7 @@
return ALPHA.get(view);
}
};
+ private static final long CROSSFADE_DURATION = 300;
/**
* A ratio representing the view's relative placement within its padded space. For example, 0
@@ -84,7 +89,7 @@
private float mTranslationYFactor;
private RecyclerView mTaskRecyclerView;
-
+ private View mEmptyView;
public IconRecentsView(Context context, AttributeSet attrs) {
super(context, attrs);
@@ -106,6 +111,19 @@
ItemTouchHelper helper = new ItemTouchHelper(
new TaskSwipeCallback(mTaskInputController));
helper.attachToRecyclerView(mTaskRecyclerView);
+
+ mEmptyView = findViewById(R.id.recent_task_empty_view);
+ mTaskAdapter.registerAdapterDataObserver(new AdapterDataObserver() {
+ @Override
+ public void onChanged() {
+ updateContentViewVisibility();
+ }
+
+ @Override
+ public void onItemRangeRemoved(int positionStart, int itemCount) {
+ updateContentViewVisibility();
+ }
+ });
}
}
@@ -133,4 +151,44 @@
private float computeTranslationYForFactor(float translationYFactor) {
return translationYFactor * (getPaddingBottom() - getPaddingTop());
}
+
+ /**
+ * Update the content view so that the appropriate view is shown based off the current list
+ * of tasks.
+ */
+ private void updateContentViewVisibility() {
+ int taskListSize = mTaskLoader.getCurrentTaskList().size();
+ if (mEmptyView.getVisibility() != VISIBLE && taskListSize == 0) {
+ crossfadeViews(mEmptyView, mTaskRecyclerView);
+ // TODO: Go to home.
+ }
+ if (mTaskRecyclerView.getVisibility() != VISIBLE && taskListSize > 0) {
+ crossfadeViews(mTaskRecyclerView, mEmptyView);
+ }
+ }
+
+ /**
+ * Animate views so that one view fades in while the other fades out.
+ *
+ * @param fadeInView view that should fade in
+ * @param fadeOutView view that should fade out
+ */
+ private void crossfadeViews(View fadeInView, View fadeOutView) {
+ fadeInView.setVisibility(VISIBLE);
+ fadeInView.setAlpha(0f);
+ fadeInView.animate()
+ .alpha(1f)
+ .setDuration(CROSSFADE_DURATION)
+ .setListener(null);
+
+ fadeOutView.animate()
+ .alpha(0f)
+ .setDuration(CROSSFADE_DURATION)
+ .setListener(new AnimatorListenerAdapter() {
+ @Override
+ public void onAnimationEnd(Animator animation) {
+ fadeOutView.setVisibility(GONE);
+ }
+ });
+ }
}