Creates BubbleBarView & BubbleBarViewController & friends

BubbleBarView shows BubbleViews in a bar similar to transient
taskbar. BubbleBarView can be collapsed (bubbles in a stack) or
expanded (bubbles all visible). When expanded, WMShell will be
notified to show the appropriate expanded bubble view (not part of
this CL).

Also creates BubbleControllers which contains BubbleBarViewController
and will eventually contain other controllers related to stashing
for the bubble bar.

Bug: 253318833
Test: manual, with other CLs, see go/bubble-bar-tests
Flag: WM_BUBBLE_BAR
Change-Id: I990ab3da6614db90ffff8c40281dc7f16b3957f6

quickstep/src/com/android/launcher3/taskbar/bubbles/BubbleBarViewController.java

@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2023 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.taskbar.bubbles;
+
+import static android.view.View.INVISIBLE;
+import static android.view.View.VISIBLE;
+
+import android.graphics.Rect;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.FrameLayout;
+
+import com.android.launcher3.R;
+import com.android.launcher3.anim.AnimatedFloat;
+import com.android.launcher3.taskbar.TaskbarActivityContext;
+import com.android.launcher3.taskbar.TaskbarControllers;
+import com.android.launcher3.util.MultiPropertyFactory;
+import com.android.launcher3.util.MultiValueAlpha;
+
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Controller for {@link BubbleBarView}. Manages the visibility of the bubble bar as well as
+ * responding to changes in bubble state provided by BubbleBarController.
+ */
+public class BubbleBarViewController {
+
+    private static final String TAG = BubbleBarViewController.class.getSimpleName();
+
+    private final TaskbarActivityContext mActivity;
+    private final BubbleBarView mBarView;
+    private final int mIconSize;
+
+    // Initialized in init.
+    private View.OnClickListener mBubbleClickListener;
+    private View.OnClickListener mBubbleBarClickListener;
+
+    // These are exposed to BubbleStashController to animate for stashing/un-stashing
+    private final MultiValueAlpha mBubbleBarAlpha;
+    private final AnimatedFloat mBubbleBarScale = new AnimatedFloat(this::updateScale);
+    private final AnimatedFloat mBubbleBarTranslationY = new AnimatedFloat(
+            this::updateTranslationY);
+
+    // Modified when swipe up is happening on the bubble bar or task bar.
+    private float mBubbleBarSwipeUpTranslationY;
+
+    // Whether the bar is hidden for a sysui state.
+    private boolean mHiddenForSysui;
+    // Whether the bar is hidden because there are no bubbles.
+    private boolean mHiddenForNoBubbles;
+
+    public BubbleBarViewController(TaskbarActivityContext activity, BubbleBarView barView) {
+        mActivity = activity;
+        mBarView = barView;
+        mBubbleBarAlpha = new MultiValueAlpha(mBarView, 1 /* num alpha channels */);
+        mBubbleBarAlpha.setUpdateVisibility(true);
+        mIconSize = activity.getResources().getDimensionPixelSize(R.dimen.bubblebar_icon_size);
+    }
+
+    public void init(TaskbarControllers controllers, BubbleControllers bubbleControllers) {
+        mActivity.addOnDeviceProfileChangeListener(dp ->
+                mBarView.getLayoutParams().height = mActivity.getDeviceProfile().taskbarHeight
+        );
+        mBarView.getLayoutParams().height = mActivity.getDeviceProfile().taskbarHeight;
+        mBubbleBarScale.updateValue(1f);
+        mBubbleClickListener = v -> onBubbleClicked(v);
+        mBubbleBarClickListener = v -> setExpanded(true);
+        mBarView.setOnClickListener(mBubbleBarClickListener);
+        // TODO: when barView layout changes tell taskbarInsetsController the insets have changed.
+    }
+
+    private void onBubbleClicked(View v) {
+        BubbleBarBubble bubble = ((BubbleView) v).getBubble();
+        if (bubble == null) {
+            Log.e(TAG, "bubble click listener, bubble was null");
+        }
+        // TODO: handle the click
+    }
+
+    //
+    // The below animators are exposed to BubbleStashController so it can manage the stashing
+    // animation.
+    //
+
+    public MultiPropertyFactory<View> getBubbleBarAlpha() {
+        return mBubbleBarAlpha;
+    }
+
+    public AnimatedFloat getBubbleBarScale() {
+        return mBubbleBarScale;
+    }
+
+    public AnimatedFloat getBubbleBarTranslationY() {
+        return mBubbleBarTranslationY;
+    }
+
+    /**
+     * Whether the bubble bar is visible or not.
+     */
+    public boolean isBubbleBarVisible() {
+        return mBarView.getVisibility() == VISIBLE;
+    }
+
+    /**
+     * The bounds of the bubble bar.
+     */
+    public Rect getBubbleBarBounds() {
+        return mBarView.getBubbleBarBounds();
+    }
+
+    /**
+     * When the bubble bar is not stashed, it can be collapsed (the icons are in a stack) or
+     * expanded (the icons are in a row). This indicates whether the bubble bar is expanded.
+     */
+    public boolean isExpanded() {
+        return mBarView.isExpanded();
+    }
+
+    /**
+     * Whether the motion event is within the bounds of the bubble bar.
+     */
+    public boolean isEventOverAnyItem(MotionEvent ev) {
+        return mBarView.isEventOverAnyItem(ev);
+    }
+
+    //
+    // Visibility of the bubble bar
+    //
+
+    /**
+     * Returns whether the bubble bar is hidden because there are no bubbles.
+     */
+    public boolean isHiddenForNoBubbles() {
+        return mHiddenForNoBubbles;
+    }
+
+    /**
+     * Sets whether the bubble bar should be hidden because there are no bubbles.
+     */
+    public void setHiddenForBubbles(boolean hidden) {
+        if (mHiddenForNoBubbles != hidden) {
+            mHiddenForNoBubbles = hidden;
+            updateVisibilityForStateChange();
+        }
+    }
+
+    /**
+     * Sets whether the bubble bar should be hidden due to SysUI state (e.g. on lockscreen).
+     */
+    public void setHiddenForSysui(boolean hidden) {
+        if (mHiddenForSysui != hidden) {
+            mHiddenForSysui = hidden;
+            updateVisibilityForStateChange();
+        }
+    }
+
+    // TODO: (b/273592694) animate it
+    private void updateVisibilityForStateChange() {
+        // TODO: check if it's stashed
+        if (!mHiddenForSysui && !mHiddenForNoBubbles) {
+            mBarView.setVisibility(VISIBLE);
+        } else {
+            mBarView.setVisibility(INVISIBLE);
+        }
+    }
+
+    //
+    // Modifying view related properties.
+    //
+
+    /**
+     * Sets the translation of the bubble bar during the swipe up gesture.
+     */
+    public void setTranslationYForSwipe(float transY) {
+        mBubbleBarSwipeUpTranslationY = transY;
+        updateTranslationY();
+    }
+
+    private void updateTranslationY() {
+        mBarView.setTranslationY(mBubbleBarTranslationY.value
+                + mBubbleBarSwipeUpTranslationY);
+    }
+
+    /**
+     * Applies scale properties for the entire bubble bar.
+     */
+    private void updateScale() {
+        float scale = mBubbleBarScale.value;
+        mBarView.setScaleX(scale);
+        mBarView.setScaleY(scale);
+    }
+
+    //
+    // Manipulating the specific bubble views in the bar
+    //
+
+    /**
+     * Removes the provided bubble from the bubble bar.
+     */
+    public void removeBubble(BubbleBarBubble b) {
+        if (b != null) {
+            mBarView.removeView(b.getView());
+        } else {
+            Log.w(TAG, "removeBubble, bubble was null!");
+        }
+    }
+
+    /**
+     * Adds the provided bubble to the bubble bar.
+     */
+    public void addBubble(BubbleBarBubble b) {
+        if (b != null) {
+            mBarView.addView(b.getView(), 0, new FrameLayout.LayoutParams(mIconSize, mIconSize));
+            b.getView().setOnClickListener(mBubbleClickListener);
+        } else {
+            Log.w(TAG, "addBubble, bubble was null!");
+        }
+    }
+
+    /**
+     * Reorders the bubbles based on the provided list.
+     */
+    public void reorderBubbles(List<BubbleBarBubble> newOrder) {
+        List<BubbleView> viewList = newOrder.stream().filter(Objects::nonNull)
+                .map(BubbleBarBubble::getView).toList();
+        mBarView.reorder(viewList);
+    }
+
+    /**
+     * Updates the selected bubble.
+     */
+    public void updateSelectedBubble(BubbleBarBubble newlySelected) {
+        mBarView.setSelectedBubble(newlySelected.getView());
+    }
+
+    /**
+     * Sets whether the bubble bar should be expanded (not unstashed, but have the contents
+     * within it expanded). This method notifies SystemUI that the bubble bar is expanded and
+     * showing a selected bubble. This method should ONLY be called from UI events originating
+     * from Launcher.
+     */
+    public void setExpanded(boolean isExpanded) {
+        if (isExpanded != mBarView.isExpanded()) {
+            mBarView.setExpanded(isExpanded);
+            if (!isExpanded) {
+                // TODO: Tell SysUi to collapse the bubble
+            } else {
+                // TODO: Tell SysUi to show the bubble
+                // TODO: Tell taskbar stash controller to stash without bubbles following
+            }
+        }
+    }
+
+    /**
+     * Sets whether the bubble bar should be expanded. This method is used in response to UI events
+     * from SystemUI.
+     */
+    public void setExpandedFromSysui(boolean isExpanded) {
+        // TODO: Tell bubble bar stash controller to stash or unstash the bubble bar
+    }
+}