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platform_packages_apps_Launcher3
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Code Issues Projects Releases Wiki Activity

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
This commit is contained in:
Kevin 2019-03-13 12:13:14 -07:00
parent fbef999385
commit 3cb12c8d20
2 changed files with 70 additions and 2 deletions
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12
go/quickstep/res/layout/icon_recents_root_view.xml
View File

@ -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>

60
go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
View File

@ -17,15 +17,19 @@ package com.android.quickstep.views;
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 @@ public final class IconRecentsView extends FrameLayout {
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 @@ public final class IconRecentsView extends FrameLayout {
private float mTranslationYFactor;
private RecyclerView mTaskRecyclerView;
private View mEmptyView;
public IconRecentsView(Context context, AttributeSet attrs) {
super(context, attrs);
@ -106,6 +111,19 @@ public final class IconRecentsView extends FrameLayout {
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 @@ public final class IconRecentsView extends FrameLayout {
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);
}
});
}
}