直播商城系统源码，快速滑动条/快速滑块/快速滚动条标准实现

直播商城系统源码，快速滑动条/快速滑块/快速滚动条标准实现

/*
 * Copyright 2018 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 androidx.recyclerview.widget;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.StateListDrawable;
import android.view.MotionEvent;
import androidx.annotation.IntDef;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import androidx.core.view.ViewCompat;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
 * Class responsible to animate and provide a fast scroller.
 */
@VisibleForTesting
class FastScroller extends RecyclerView.ItemDecoration implements RecyclerView.OnItemTouchListener {
    @IntDef({STATE_HIDDEN, STATE_VISIBLE, STATE_DRAGGING})
    @Retention(RetentionPolicy.SOURCE)
    private @interface State { }
    // Scroll thumb not showing
    private static final int STATE_HIDDEN = 0;
    // Scroll thumb visible and moving along with the scrollbar
    private static final int STATE_VISIBLE = 1;
    // Scroll thumb being dragged by user
    private static final int STATE_DRAGGING = 2;
    @IntDef({DRAG_X, DRAG_Y, DRAG_NONE})
    @Retention(RetentionPolicy.SOURCE)
    private @interface DragState{ }
    private static final int DRAG_NONE = 0;
    private static final int DRAG_X = 1;
    private static final int DRAG_Y = 2;
    @IntDef({ANIMATION_STATE_OUT, ANIMATION_STATE_FADING_IN, ANIMATION_STATE_IN,
        ANIMATION_STATE_FADING_OUT})
    @Retention(RetentionPolicy.SOURCE)
    private @interface AnimationState { }
    private static final int ANIMATION_STATE_OUT = 0;
    private static final int ANIMATION_STATE_FADING_IN = 1;
    private static final int ANIMATION_STATE_IN = 2;
    private static final int ANIMATION_STATE_FADING_OUT = 3;
    private static final int SHOW_DURATION_MS = 500;
    private static final int HIDE_DELAY_AFTER_VISIBLE_MS = 1500;
    private static final int HIDE_DELAY_AFTER_DRAGGING_MS = 1200;
    private static final int HIDE_DURATION_MS = 500;
    private static final int SCROLLBAR_FULL_OPAQUE = 255;
    private static final int[] PRESSED_STATE_SET = new int[]{android.R.attr.state_pressed};
    private static final int[] EMPTY_STATE_SET = new int[]{};
    private final int mScrollbarMinimumRange;
    private final int mMargin;
    // Final values for the vertical scroll bar
    @SuppressWarnings("WeakerAccess") /* synthetic access */
    final StateListDrawable mVerticalThumbDrawable;
    @SuppressWarnings("WeakerAccess") /* synthetic access */
    final Drawable mVerticalTrackDrawable;
    private final int mVerticalThumbWidth;
    private final int mVerticalTrackWidth;
    // Final values for the horizontal scroll bar
    private final StateListDrawable mHorizontalThumbDrawable;
    private final Drawable mHorizontalTrackDrawable;
    private final int mHorizontalThumbHeight;
    private final int mHorizontalTrackHeight;
    // Dynamic values for the vertical scroll bar
    @VisibleForTesting int mVerticalThumbHeight;
    @VisibleForTesting int mVerticalThumbCenterY;
    @VisibleForTesting float mVerticalDragY;
    // Dynamic values for the horizontal scroll bar
    @VisibleForTesting int mHorizontalThumbWidth;
    @VisibleForTesting int mHorizontalThumbCenterX;
    @VisibleForTesting float mHorizontalDragX;
    private int mRecyclerViewWidth = 0;
    private int mRecyclerViewHeight = 0;
    private RecyclerView mRecyclerView;
    /**
     * Whether the document is long/wide enough to require scrolling. If not, we don't show the
     * relevant scroller.
     */
    private boolean mNeedVerticalScrollbar = false;
    private boolean mNeedHorizontalScrollbar = false;
    @State private int mState = STATE_HIDDEN;
    @DragState private int mDragState = DRAG_NONE;
    private final int[] mVerticalRange = new int[2];
    private final int[] mHorizontalRange = new int[2];
    @SuppressWarnings("WeakerAccess") /* synthetic access */
    final ValueAnimator mShowHideAnimator = ValueAnimator.ofFloat(0, 1);
    @SuppressWarnings("WeakerAccess") /* synthetic access */
    @AnimationState int mAnimationState = ANIMATION_STATE_OUT;
    private final Runnable mHideRunnable = new Runnable() {
        @Override
        public void run() {
            hide(HIDE_DURATION_MS);
        }

​

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