1 files changed, 203 insertions, 0 deletions
diff --git a/quickstep/src/com/android/launcher3/taskbar/StashedHandleViewController.java b/quickstep/src/com/android/launcher3/taskbar/StashedHandleViewController.java
new file mode 100644
index 0000000000..22ca63f963
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/taskbar/StashedHandleViewController.java
@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2021 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;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ValueAnimator;
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.graphics.Outline;
+import android.graphics.Rect;
+import android.view.View;
+import android.view.ViewOutlineProvider;
+
+import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.anim.RevealOutlineAnimation;
+import com.android.launcher3.anim.RoundedRectRevealOutlineProvider;
+import com.android.launcher3.util.Executors;
+import com.android.launcher3.util.MultiValueAlpha;
+import com.android.quickstep.AnimatedFloat;
+import com.android.systemui.shared.navigationbar.RegionSamplingHelper;
+
+/**
+ * Handles properties/data collection, then passes the results to our stashed handle View to render.
+ */
+public class StashedHandleViewController {
+
+    public static final int ALPHA_INDEX_STASHED = 0;
+    public static final int ALPHA_INDEX_HOME_DISABLED = 1;
+    private static final int NUM_ALPHA_CHANNELS = 2;
+
+    /**
+     * The SharedPreferences key for whether the stashed handle region is dark.
+     */
+    private static final String SHARED_PREFS_STASHED_HANDLE_REGION_DARK_KEY =
+            "stashed_handle_region_is_dark";
+
+    private final TaskbarActivityContext mActivity;
+    private final SharedPreferences mPrefs;
+    private final StashedHandleView mStashedHandleView;
+    private final int mStashedHandleWidth;
+    private final int mStashedHandleHeight;
+    private final RegionSamplingHelper mRegionSamplingHelper;
+    private final MultiValueAlpha mTaskbarStashedHandleAlpha;
+    private final AnimatedFloat mTaskbarStashedHandleHintScale = new AnimatedFloat(
+            this::updateStashedHandleHintScale);
+
+    // Initialized in init.
+    private TaskbarControllers mControllers;
+
+    // The bounds we want to clip to in the settled state when showing the stashed handle.
+    private final Rect mStashedHandleBounds = new Rect();
+    private float mStashedHandleRadius;
+
+    // When the reveal animation is cancelled, we can assume it's about to create a new animation,
+    // which should start off at the same point the cancelled one left off.
+    private float mStartProgressForNextRevealAnim;
+    private boolean mWasLastRevealAnimReversed;
+
+    public StashedHandleViewController(TaskbarActivityContext activity,
+            StashedHandleView stashedHandleView) {
+        mActivity = activity;
+        mPrefs = Utilities.getPrefs(mActivity);
+        mStashedHandleView = stashedHandleView;
+        mTaskbarStashedHandleAlpha = new MultiValueAlpha(mStashedHandleView, NUM_ALPHA_CHANNELS);
+        mTaskbarStashedHandleAlpha.setUpdateVisibility(true);
+        mStashedHandleView.updateHandleColor(
+                mPrefs.getBoolean(SHARED_PREFS_STASHED_HANDLE_REGION_DARK_KEY, false),
+                false /* animate */);
+        final Resources resources = mActivity.getResources();
+        mStashedHandleWidth = resources.getDimensionPixelSize(R.dimen.taskbar_stashed_handle_width);
+        mStashedHandleHeight = resources.getDimensionPixelSize(
+                R.dimen.taskbar_stashed_handle_height);
+        mRegionSamplingHelper = new RegionSamplingHelper(mStashedHandleView,
+                new RegionSamplingHelper.SamplingCallback() {
+                    @Override
+                    public void onRegionDarknessChanged(boolean isRegionDark) {
+                        mStashedHandleView.updateHandleColor(isRegionDark, true /* animate */);
+                        mPrefs.edit().putBoolean(SHARED_PREFS_STASHED_HANDLE_REGION_DARK_KEY,
+                                isRegionDark).apply();
+                    }
+
+                    @Override
+                    public Rect getSampledRegion(View sampledView) {
+                        return mStashedHandleView.getSampledRegion();
+                    }
+                }, Executors.UI_HELPER_EXECUTOR);
+    }
+
+    public void init(TaskbarControllers controllers) {
+        mControllers = controllers;
+        mStashedHandleView.getLayoutParams().height = mActivity.getDeviceProfile().taskbarSize;
+
+        mTaskbarStashedHandleAlpha.getProperty(ALPHA_INDEX_STASHED).setValue(0);
+        mTaskbarStashedHandleHintScale.updateValue(1f);
+
+        final int stashedTaskbarHeight = mControllers.taskbarStashController.getStashedHeight();
+        mStashedHandleView.setOutlineProvider(new ViewOutlineProvider() {
+            @Override
+            public void getOutline(View view, Outline outline) {
+                final int stashedCenterX = view.getWidth() / 2;
+                final int stashedCenterY = view.getHeight() - stashedTaskbarHeight / 2;
+                mStashedHandleBounds.set(
+                        stashedCenterX - mStashedHandleWidth / 2,
+                        stashedCenterY - mStashedHandleHeight / 2,
+                        stashedCenterX + mStashedHandleWidth / 2,
+                        stashedCenterY + mStashedHandleHeight / 2);
+                mStashedHandleView.updateSampledRegion(mStashedHandleBounds);
+                mStashedHandleRadius = view.getHeight() / 2f;
+                outline.setRoundRect(mStashedHandleBounds, mStashedHandleRadius);
+            }
+        });
+
+        mStashedHandleView.addOnLayoutChangeListener((view, i, i1, i2, i3, i4, i5, i6, i7) -> {
+            final int stashedCenterX = view.getWidth() / 2;
+            final int stashedCenterY = view.getHeight() - stashedTaskbarHeight / 2;
+
+            view.setPivotX(stashedCenterX);
+            view.setPivotY(stashedCenterY);
+        });
+    }
+
+    public void onDestroy() {
+        mRegionSamplingHelper.stopAndDestroy();
+    }
+
+    public MultiValueAlpha getStashedHandleAlpha() {
+        return mTaskbarStashedHandleAlpha;
+    }
+
+    public AnimatedFloat getStashedHandleHintScale() {
+        return mTaskbarStashedHandleHintScale;
+    }
+
+    /**
+     * Creates and returns a {@link RevealOutlineAnimation} Animator that updates the stashed handle
+     * shape and size. When stashed, the shape is a thin rounded pill. When unstashed, the shape
+     * morphs into the size of where the taskbar icons will be.
+     */
+    public Animator createRevealAnimToIsStashed(boolean isStashed) {
+        final RevealOutlineAnimation handleRevealProvider = new RoundedRectRevealOutlineProvider(
+                mStashedHandleRadius, mStashedHandleRadius,
+                mControllers.taskbarViewController.getIconLayoutBounds(), mStashedHandleBounds);
+
+        boolean isReversed = !isStashed;
+        boolean changingDirection = mWasLastRevealAnimReversed != isReversed;
+        mWasLastRevealAnimReversed = isReversed;
+        if (changingDirection) {
+            mStartProgressForNextRevealAnim = 1f - mStartProgressForNextRevealAnim;
+        }
+
+        ValueAnimator revealAnim = handleRevealProvider.createRevealAnimator(mStashedHandleView,
+                isReversed, mStartProgressForNextRevealAnim);
+        revealAnim.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mStartProgressForNextRevealAnim = ((ValueAnimator) animation).getAnimatedFraction();
+            }
+        });
+        return revealAnim;
+    }
+
+    public void onIsStashed(boolean isStashed) {
+        mRegionSamplingHelper.setWindowVisible(isStashed);
+        if (isStashed) {
+            mStashedHandleView.updateSampledRegion(mStashedHandleBounds);
+            mRegionSamplingHelper.start(mStashedHandleView.getSampledRegion());
+        } else {
+            mRegionSamplingHelper.stop();
+        }
+    }
+
+    protected void updateStashedHandleHintScale() {
+        mStashedHandleView.setScaleX(mTaskbarStashedHandleHintScale.value);
+        mStashedHandleView.setScaleY(mTaskbarStashedHandleHintScale.value);
+    }
+
+    /**
+     * Should be called when the home button is disabled, so we can hide this handle as well.
+     */
+    public void setIsHomeButtonDisabled(boolean homeDisabled) {
+        mTaskbarStashedHandleAlpha.getProperty(ALPHA_INDEX_HOME_DISABLED).setValue(
+                homeDisabled ? 0 : 1);
+    }
+
+    public boolean isStashedHandleVisible() {
+        return mStashedHandleView.getVisibility() == View.VISIBLE;
+    }
+}