Add swipe-to-dismiss notifications in popup menu.

- Next secondary icon animates up to replace dismissed main notification
- Add padding around main notification so it always aligns with the
  straight edges of the view (not the rounded corners); looks more
  dismissable
- Notification view collapses as notifications are dismissed
- To mimic system notification behavior, we copy SwipeHelper,
  FlingAnimationUtils, and Interpolators. We also apply elevation
  to notifications and reveal a darker color beneath when dismissing.

Bug: 32410600
Change-Id: I9fbf10e73bb4996f17ef061c856efb013967d972

src/com/android/launcher3/notification/NotificationMainView.java

@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.notification;
+
+import android.animation.Animator;
+import android.animation.AnimatorSet;
+import android.animation.ValueAnimator;
+import android.content.Context;
+import android.support.annotation.Nullable;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAnimUtils;
+import com.android.launcher3.LauncherViewPropertyAnimator;
+import com.android.launcher3.R;
+import com.android.launcher3.graphics.IconPalette;
+
+/**
+ * A {@link LinearLayout} that contains a single notification, e.g. icon + title + text.
+ */
+public class NotificationMainView extends LinearLayout implements SwipeHelper.Callback {
+
+    private NotificationInfo mNotificationInfo;
+    private TextView mTitleView;
+    private TextView mTextView;
+
+    public NotificationMainView(Context context) {
+        this(context, null, 0);
+    }
+
+    public NotificationMainView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public NotificationMainView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        mTitleView = (TextView) findViewById(R.id.title);
+        mTextView = (TextView) findViewById(R.id.text);
+    }
+
+    public void applyNotificationInfo(NotificationInfo mainNotification, View iconView) {
+        applyNotificationInfo(mainNotification, iconView, null);
+    }
+
+    /**
+     * @param iconPalette if not null, indicates that the new info should be animated in,
+     *                    and that part of this animation includes animating the background
+     *                    from iconPalette.secondaryColor to iconPalette.backgroundColor.
+     */
+    public void applyNotificationInfo(NotificationInfo mainNotification, View iconView,
+            @Nullable IconPalette iconPalette) {
+        boolean animate = iconPalette != null;
+        if (animate) {
+            mTitleView.setAlpha(0);
+            mTextView.setAlpha(0);
+            setBackgroundColor(iconPalette.secondaryColor);
+        }
+        mNotificationInfo = mainNotification;
+        mTitleView.setText(mNotificationInfo.title);
+        mTextView.setText(mNotificationInfo.text);
+        iconView.setBackground(mNotificationInfo.iconDrawable);
+        setOnClickListener(mNotificationInfo);
+        setTranslationX(0);
+        if (animate) {
+            AnimatorSet animation = LauncherAnimUtils.createAnimatorSet();
+            Animator textFade = new LauncherViewPropertyAnimator(mTextView).alpha(1);
+            Animator titleFade = new LauncherViewPropertyAnimator(mTitleView).alpha(1);
+            ValueAnimator colorChange = ValueAnimator.ofArgb(iconPalette.secondaryColor,
+                    iconPalette.backgroundColor);
+            colorChange.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+                @Override
+                public void onAnimationUpdate(ValueAnimator valueAnimator) {
+                    setBackgroundColor((Integer) valueAnimator.getAnimatedValue());
+                }
+            });
+            animation.playTogether(textFade, titleFade, colorChange);
+            animation.setDuration(150);
+            animation.start();
+        }
+    }
+
+    public NotificationInfo getNotificationInfo() {
+        return mNotificationInfo;
+    }
+
+
+    // SwipeHelper.Callback's
+
+    @Override
+    public View getChildAtPosition(MotionEvent ev) {
+        return this;
+    }
+
+    @Override
+    public boolean canChildBeDismissed(View v) {
+        return mNotificationInfo.dismissable;
+    }
+
+    @Override
+    public boolean isAntiFalsingNeeded() {
+        return false;
+    }
+
+    @Override
+    public void onBeginDrag(View v) {
+    }
+
+    @Override
+    public void onChildDismissed(View v) {
+        Launcher.getLauncher(getContext()).getPopupDataProvider().cancelNotification(
+                mNotificationInfo.notificationKey);
+    }
+
+    @Override
+    public void onDragCancelled(View v) {
+    }
+
+    @Override
+    public void onChildSnappedBack(View animView, float targetLeft) {
+    }
+
+    @Override
+    public boolean updateSwipeProgress(View animView, boolean dismissable, float swipeProgress) {
+        // Don't fade out.
+        return true;
+    }
+
+    @Override
+    public float getFalsingThresholdFactor() {
+        return 1;
+    }
+}