[Home] Move bottom sheet classes to widget/bottomsheet

chrome/android/java/src/org/chromium/chrome/browser/widget/BottomSheetObserver.java

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.chrome.browser.widget;
-
-/**
- * An interface for notifications about the state of the bottom sheet.
- */
-public interface BottomSheetObserver {
-    /**
-     * A notification that the sheet has been opened, meaning the sheet is any height greater
-     * than its peeking state.
-     */
-    void onSheetOpened();
-
-    /**
-     * A notification that the sheet has closed, meaning the sheet has reached its peeking state.
-     */
-    void onSheetClosed();
-
-    /**
-     * A notification that the sheet has begun loading a URL.
-     *
-     * @param url The URL being loaded.
-     */
-    void onLoadUrl(String url);
-
-    /**
-     * An event for when the sheet's offset from the bottom of the screen changes.
-     *
-     * @param heightFraction The fraction of the way to the fully expanded state that the sheet
-     *                       is. This will be 0.0f when the sheet is peeking and 1.0f when the
-     *                       sheet is completely expanded.
-     */
-    void onSheetOffsetChanged(float heightFraction);
-
-    /**
-     * An event for when the sheet is transitioning from the peeking state to the half expanded
-     * state. Once the sheet is outside the peek-half range, this event will no longer be
-     * called. This event is guaranteed to be called at least once with 0.0f in the peeking state
-     * and 1.0f at or past the half state. This means if the sheet is set to the full state from
-     * the peeking state, this event will be called a single time with 1.0f.
-     *
-     * @param transitionFraction The fraction of the way to the half expanded state that the
-     *                           sheet is. This will be 0.0f when the sheet is peeking and 1.0f
-     *                           when the sheet is half expanded.
-     */
-    void onTransitionPeekToHalf(float transitionFraction);
-}