1 files changed, 106 insertions, 0 deletions
diff --git a/quickstep/src/com/android/launcher3/taskbar/StashedHandleView.java b/quickstep/src/com/android/launcher3/taskbar/StashedHandleView.java
new file mode 100644
index 0000000000..6db58397c3
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/taskbar/StashedHandleView.java
@@ -0,0 +1,106 @@
+/*
+ * 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.ObjectAnimator;
+import android.annotation.Nullable;
+import android.content.Context;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.view.View;
+
+import androidx.annotation.ColorInt;
+import androidx.core.content.ContextCompat;
+
+import com.android.launcher3.LauncherAnimUtils;
+import com.android.launcher3.R;
+
+public class StashedHandleView extends View {
+
+    private static final long COLOR_CHANGE_DURATION = 120;
+
+    private final @ColorInt int mStashedHandleLightColor;
+    private final @ColorInt int mStashedHandleDarkColor;
+    private final Rect mSampledRegion = new Rect();
+    private final int[] mTmpArr = new int[2];
+
+    private @Nullable ObjectAnimator mColorChangeAnim;
+
+    public StashedHandleView(Context context) {
+        this(context, null);
+    }
+
+    public StashedHandleView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public StashedHandleView(Context context, AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, 0);
+    }
+
+    public StashedHandleView(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+
+        mStashedHandleLightColor = ContextCompat.getColor(context,
+                R.color.taskbar_stashed_handle_light_color);
+        mStashedHandleDarkColor = ContextCompat.getColor(context,
+                R.color.taskbar_stashed_handle_dark_color);
+    }
+
+    /**
+     * Updates mSampledRegion to be the location of the stashedHandleBounds relative to the screen.
+     * @see #getSampledRegion()
+     */
+    public void updateSampledRegion(Rect stashedHandleBounds) {
+        getLocationOnScreen(mTmpArr);
+        mSampledRegion.set(stashedHandleBounds);
+        mSampledRegion.offset(mTmpArr[0], mTmpArr[1]);
+    }
+
+    public Rect getSampledRegion() {
+        return mSampledRegion;
+    }
+
+    /**
+     * Updates the handle color.
+     * @param isRegionDark Whether the background behind the handle is dark, and thus the handle
+     *                     should be light (and vice versa).
+     * @param animate Whether to animate the change, or apply it immediately.
+     */
+    public void updateHandleColor(boolean isRegionDark, boolean animate) {
+        int newColor = isRegionDark ? mStashedHandleLightColor : mStashedHandleDarkColor;
+        if (mColorChangeAnim != null) {
+            mColorChangeAnim.cancel();
+        }
+        if (animate) {
+            mColorChangeAnim = ObjectAnimator.ofArgb(this,
+                    LauncherAnimUtils.VIEW_BACKGROUND_COLOR, newColor);
+            mColorChangeAnim.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mColorChangeAnim = null;
+                }
+            });
+            mColorChangeAnim.setDuration(COLOR_CHANGE_DURATION);
+            mColorChangeAnim.start();
+        } else {
+            setBackgroundColor(newColor);
+        }
+    }
+}