content: /*
   * Copyright (C) 2017 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.widget;
  
  import android.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.animation.ObjectAnimator;
  import android.content.Context;
  import android.graphics.Rect;
  import android.util.AttributeSet;
  import android.view.Gravity;
  import android.view.LayoutInflater;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.animation.AnimationUtils;
  import android.view.animation.Interpolator;
  import android.widget.TextView;
  
  import com.android.launcher3.AbstractFloatingView;
  import com.android.launcher3.DropTarget;
  import com.android.launcher3.Insettable;
  import com.android.launcher3.ItemInfo;
  import com.android.launcher3.Launcher;
  import com.android.launcher3.LauncherAnimUtils;
  import com.android.launcher3.LauncherAppState;
  import com.android.launcher3.R;
  import com.android.launcher3.Utilities;
  import com.android.launcher3.touch.SwipeDetector;
  import com.android.launcher3.anim.PropertyListBuilder;
  import com.android.launcher3.dragndrop.DragController;
  import com.android.launcher3.dragndrop.DragOptions;
  import com.android.launcher3.graphics.GradientView;
  import com.android.launcher3.model.WidgetItem;
  import com.android.launcher3.userevent.nano.LauncherLogProto;
  import com.android.launcher3.util.PackageUserKey;
  import com.android.launcher3.util.SystemUiController;
  import com.android.launcher3.util.Themes;
  import com.android.launcher3.util.TouchController;
  
  import java.util.List;
  
  /**
   * Bottom sheet for the "Widgets" system shortcut in the long-press popup.
   */
  public class WidgetsBottomSheet extends AbstractFloatingView implements Insettable, TouchController,
          SwipeDetector.Listener, View.OnClickListener, View.OnLongClickListener,
          DragController.DragListener {
  
      private int mTranslationYOpen;
      private int mTranslationYClosed;
      private float mTranslationYRange;
  
      private Launcher mLauncher;
      private ItemInfo mOriginalItemInfo;
      private ObjectAnimator mOpenCloseAnimator;
      private Interpolator mFastOutSlowInInterpolator;
      private SwipeDetector.ScrollInterpolator mScrollInterpolator;
      private Rect mInsets;
      private SwipeDetector mSwipeDetector;
      private GradientView mGradientBackground;
  
      public WidgetsBottomSheet(Context context, AttributeSet attrs) {
          this(context, attrs, 0);
      }
  
      public WidgetsBottomSheet(Context context, AttributeSet attrs, int defStyleAttr) {
          super(context, attrs, defStyleAttr);
          setWillNotDraw(false);
          mLauncher = Launcher.getLauncher(context);
          mOpenCloseAnimator = LauncherAnimUtils.ofPropertyValuesHolder(this);
          mFastOutSlowInInterpolator =
                  AnimationUtils.loadInterpolator(context, android.R.interpolator.fast_out_slow_in);
          mScrollInterpolator = new SwipeDetector.ScrollInterpolator();
          mInsets = new Rect();
          mSwipeDetector = new SwipeDetector(context, this, SwipeDetector.VERTICAL);
          mGradientBackground = (GradientView) mLauncher.getLayoutInflater().inflate(
                  R.layout.gradient_bg, mLauncher.getDragLayer(), false);
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);
          mTranslationYOpen = 0;
          mTranslationYClosed = getMeasuredHeight();
          mTranslationYRange = mTranslationYClosed - mTranslationYOpen;
      }
  
      public void populateAndShow(ItemInfo itemInfo) {
          mOriginalItemInfo = itemInfo;
          ((TextView) findViewById(R.id.title)).setText(getContext().getString(
                  R.string.widgets_bottom_sheet_title, mOriginalItemInfo.title));
  
          onWidgetsBound();
  
          mLauncher.getDragLayer().addView(mGradientBackground);
          mGradientBackground.setVisibility(VISIBLE);
          mLauncher.getDragLayer().addView(this);
          measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
          setTranslationY(mTranslationYClosed);
          mIsOpen = false;
          open(true);
      }
  
      @Override
      protected void onWidgetsBound() {
          List<WidgetItem> widgets = mLauncher.getWidgetsForPackageUser(new PackageUserKey(
                  mOriginalItemInfo.getTargetComponent().getPackageName(), mOriginalItemInfo.user));
  
          ViewGroup widgetRow = (ViewGroup) findViewById(R.id.widgets);
          ViewGroup widgetCells = (ViewGroup) widgetRow.findViewById(R.id.widgets_cell_list);
  
          widgetCells.removeAllViews();
  
          for (int i = 0; i < widgets.size(); i++) {
              WidgetCell widget = addItemCell(widgetCells);
              widget.applyFromCellItem(widgets.get(i), LauncherAppState.getInstance(mLauncher)
                      .getWidgetCache());
              widget.ensurePreview();
              widget.setVisibility(View.VISIBLE);
              if (i < widgets.size() - 1) {
                  addDivider(widgetCells);
              }
          }
  
          if (widgets.size() == 1) {
              // If there is only one widget, we want to center it instead of left-align.
              WidgetsBottomSheet.LayoutParams params = (WidgetsBottomSheet.LayoutParams)
                      widgetRow.getLayoutParams();
              params.gravity = Gravity.CENTER_HORIZONTAL;
          } else {
              // Otherwise, add an empty view to the start as padding (but still scroll edge to edge).
              View leftPaddingView = LayoutInflater.from(getContext()).inflate(
                      R.layout.widget_list_divider, widgetRow, false);
              leftPaddingView.getLayoutParams().width = Utilities.pxFromDp(
                      16, getResources().getDisplayMetrics());
              widgetCells.addView(leftPaddingView, 0);
          }
      }
  
      private void addDivider(ViewGroup parent) {
          LayoutInflater.from(getContext()).inflate(R.layout.widget_list_divider, parent, true);
      }
  
      private WidgetCell addItemCell(ViewGroup parent) {
          WidgetCell widget = (WidgetCell) LayoutInflater.from(getContext()).inflate(
                  R.layout.widget_cell, parent, false);
  
          widget.setOnClickListener(this);
          widget.setOnLongClickListener(this);
          widget.setAnimatePreview(false);
  
          parent.addView(widget);
          return widget;
      }
  
      @Override
      public void onClick(View view) {
          mLauncher.getWidgetsView().handleClick();
      }
  
      @Override
      public boolean onLongClick(View view) {
          mLauncher.getDragController().addDragListener(this);
          return mLauncher.getWidgetsView().handleLongClick(view);
      }
  
      private void open(boolean animate) {
          if (mIsOpen || mOpenCloseAnimator.isRunning()) {
              return;
          }
          mIsOpen = true;
          boolean isSheetDark = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark);
          mLauncher.getSystemUiController().updateUiState(
                  SystemUiController.UI_STATE_WIDGET_BOTTOM_SHEET,
                  isSheetDark ? SystemUiController.FLAG_DARK_NAV : SystemUiController.FLAG_LIGHT_NAV);
          if (animate) {
              mOpenCloseAnimator.setValues(new PropertyListBuilder()
                      .translationY(mTranslationYOpen).build());
              mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
                  @Override
                  public void onAnimationEnd(Animator animation) {
                      mSwipeDetector.finishedScrolling();
                  }
              });
              mOpenCloseAnimator.setInterpolator(mFastOutSlowInInterpolator);
              mOpenCloseAnimator.start();
          } else {
              setTranslationY(mTranslationYOpen);
          }
      }
  
      @Override
      protected void handleClose(boolean animate) {
          if (!mIsOpen || mOpenCloseAnimator.isRunning()) {
              return;
          }
          if (animate) {
              mOpenCloseAnimator.setValues(new PropertyListBuilder()
                      .translationY(mTranslationYClosed).build());
              mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
                  @Override
                  public void onAnimationEnd(Animator animation) {
                      mSwipeDetector.finishedScrolling();
                      onCloseComplete();
                  }
              });
              mOpenCloseAnimator.setInterpolator(mSwipeDetector.isIdleState()
                      ? mFastOutSlowInInterpolator : mScrollInterpolator);
              mOpenCloseAnimator.start();
          } else {
              setTranslationY(mTranslationYClosed);
              onCloseComplete();
          }
      }
  
      private void onCloseComplete() {
          mIsOpen = false;
          mLauncher.getDragLayer().removeView(mGradientBackground);
          mLauncher.getDragLayer().removeView(WidgetsBottomSheet.this);
          mLauncher.getSystemUiController().updateUiState(
                  SystemUiController.UI_STATE_WIDGET_BOTTOM_SHEET, 0);
      }
  
      @Override
      protected boolean isOfType(@FloatingViewType int type) {
          return (type & TYPE_WIDGETS_BOTTOM_SHEET) != 0;
      }
  
      @Override
      public int getLogContainerType() {
          return LauncherLogProto.ContainerType.WIDGETS; // TODO: be more specific
      }
  
      /**
       * Returns a {@link WidgetsBottomSheet} which is already open or null
       */
      public static WidgetsBottomSheet getOpen(Launcher launcher) {
          return getOpenView(launcher, TYPE_WIDGETS_BOTTOM_SHEET);
      }
  
      @Override
      public void setInsets(Rect insets) {
          // Extend behind left, right, and bottom insets.
          int leftInset = insets.left - mInsets.left;
          int rightInset = insets.right - mInsets.right;
          int bottomInset = insets.bottom - mInsets.bottom;
          mInsets.set(insets);
  
          if (!Utilities.ATLEAST_OREO && !mLauncher.getDeviceProfile().isVerticalBarLayout()) {
              View navBarBg = findViewById(R.id.nav_bar_bg);
              ViewGroup.LayoutParams navBarBgLp = navBarBg.getLayoutParams();
              navBarBgLp.height = bottomInset;
              navBarBg.setLayoutParams(navBarBgLp);
              bottomInset = 0;
          }
  
          setPadding(getPaddingLeft() + leftInset, getPaddingTop(),
                  getPaddingRight() + rightInset, getPaddingBottom() + bottomInset);
      }
  
      /* SwipeDetector.Listener */
  
      @Override
      public void onDragStart(boolean start) {
      }
  
      @Override
      public boolean onDrag(float displacement, float velocity) {
          setTranslationY(Utilities.boundToRange(displacement, mTranslationYOpen,
                  mTranslationYClosed));
          return true;
      }
  
      @Override
      public void setTranslationY(float translationY) {
          super.setTranslationY(translationY);
          if (mGradientBackground == null) return;
          float p = (mTranslationYClosed - translationY) / mTranslationYRange;
          boolean showScrim = p <= 0;
          mGradientBackground.setProgress(p, showScrim);
      }
  
      @Override
      public void onDragEnd(float velocity, boolean fling) {
          if ((fling && velocity > 0) || getTranslationY() > (mTranslationYRange) / 2) {
              mScrollInterpolator.setVelocityAtZero(velocity);
              mOpenCloseAnimator.setDuration(SwipeDetector.calculateDuration(velocity,
                      (mTranslationYClosed - getTranslationY()) / mTranslationYRange));
              close(true);
          } else {
              mIsOpen = false;
              mOpenCloseAnimator.setDuration(SwipeDetector.calculateDuration(velocity,
                      (getTranslationY() - mTranslationYOpen) / mTranslationYRange));
              open(true);
          }
      }
  
      @Override
      public boolean onControllerTouchEvent(MotionEvent ev) {
          return mSwipeDetector.onTouchEvent(ev);
      }
  
      @Override
      public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
          int directionsToDetectScroll = mSwipeDetector.isIdleState() ?
                  SwipeDetector.DIRECTION_NEGATIVE : 0;
          mSwipeDetector.setDetectableScrollConditions(
                  directionsToDetectScroll, false);
          mSwipeDetector.onTouchEvent(ev);
          return mSwipeDetector.isDraggingOrSettling();
      }
  
      /* DragListener */
  
      @Override
      public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
          // A widget or custom shortcut was dragged.
          close(true);
      }
  
      @Override
      public void onDragEnd() {
      }
  }
  