Use official FastScroll fix and refactor PasswordFragment (#753)

2 files changed, 6 insertions, 352 deletions

diff --git a/app/src/main/java/androidx/recyclerview/widget/FixOnItemTouchDispatchRecyclerView.java b/app/src/main/java/androidx/recyclerview/widget/FixOnItemTouchDispatchRecyclerView.java
deleted file mode 100644
index 58590a66..00000000
--- a/app/src/main/java/androidx/recyclerview/widget/FixOnItemTouchDispatchRecyclerView.java
+++ /dev/null
@@ -1,341 +0,0 @@
-/*
- * Copyright 2020 Google LLC
- *
- * 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
- *
- *     https://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.annotation.SuppressLint;
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Rect;
-import android.util.AttributeSet;
-import android.view.MotionEvent;
-import android.view.View;
-
-import androidx.annotation.AttrRes;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
-
-import me.zhanghai.android.fastscroll.FastScroller;
-import me.zhanghai.android.fastscroll.PopupTextProvider;
-import me.zhanghai.android.fastscroll.Predicate;
-import me.zhanghai.android.fastscroll.ViewHelperProvider;
-
-public class FixOnItemTouchDispatchRecyclerView extends RecyclerView implements ViewHelperProvider {
-
-    @NonNull
-    private final ViewHelper mViewHelper = new ViewHelper(this);
-
-    @Nullable
-    private OnItemTouchListener mPhantomOnItemTouchListener = null;
-    private OnItemTouchListener mInterceptingOnItemTouchListener = null;
-
-    public FixOnItemTouchDispatchRecyclerView(@NonNull Context context) {
-        super(context);
-    }
-
-    public FixOnItemTouchDispatchRecyclerView(@NonNull Context context,
-                                              @Nullable AttributeSet attrs) {
-        super(context, attrs);
-    }
-
-    public FixOnItemTouchDispatchRecyclerView(@NonNull Context context,
-                                              @Nullable AttributeSet attrs,
-                                              @AttrRes int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-    }
-
-    @NonNull
-    @Override
-    public FastScroller.ViewHelper getViewHelper() {
-        return mViewHelper;
-    }
-
-    @Override
-    public boolean onInterceptTouchEvent(MotionEvent e) {
-        mInterceptingOnItemTouchListener = null;
-        if (findInterceptingOnItemTouchListener(e)) {
-            cancelScroll();
-            return true;
-        }
-        return super.onInterceptTouchEvent(e);
-    }
-
-    @SuppressLint("ClickableViewAccessibility")
-    @Override
-    public boolean onTouchEvent(MotionEvent e) {
-        if (dispatchOnItemTouchListeners(e)) {
-            cancelScroll();
-            return true;
-        }
-        return super.onTouchEvent(e);
-    }
-
-    @Override
-    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
-        if (mPhantomOnItemTouchListener != null) {
-            mPhantomOnItemTouchListener.onRequestDisallowInterceptTouchEvent(disallowIntercept);
-        }
-        super.requestDisallowInterceptTouchEvent(disallowIntercept);
-    }
-
-    private void cancelScroll() {
-        MotionEvent syntheticCancel = MotionEvent.obtain(
-                0, 0, MotionEvent.ACTION_CANCEL, 0f, 0f, 0);
-        super.onInterceptTouchEvent(syntheticCancel);
-        syntheticCancel.recycle();
-    }
-
-    private boolean dispatchOnItemTouchListeners(@NonNull MotionEvent e) {
-        if (mInterceptingOnItemTouchListener == null) {
-            if (e.getAction() == MotionEvent.ACTION_DOWN) {
-                return false;
-            }
-            return findInterceptingOnItemTouchListener(e);
-        } else {
-            mInterceptingOnItemTouchListener.onTouchEvent(this, e);
-            final int action = e.getAction();
-            if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
-                mInterceptingOnItemTouchListener = null;
-            }
-            return true;
-        }
-    }
-
-    private boolean findInterceptingOnItemTouchListener(@NonNull MotionEvent e) {
-        int action = e.getAction();
-        if (mPhantomOnItemTouchListener != null
-                && mPhantomOnItemTouchListener.onInterceptTouchEvent(this, e)
-                && action != MotionEvent.ACTION_CANCEL) {
-            mInterceptingOnItemTouchListener = mPhantomOnItemTouchListener;
-            return true;
-        }
-        return false;
-    }
-
-    private static class RecyclerViewHelper implements FastScroller.ViewHelper {
-
-        @NonNull
-        private final RecyclerView mView;
-
-        @NonNull
-        private final Rect mTempRect = new Rect();
-
-        public RecyclerViewHelper(@NonNull RecyclerView view) {
-            mView = view;
-        }
-
-        @Override
-        public void addOnPreDrawListener(@NonNull Runnable onPreDraw) {
-            mView.addItemDecoration(new RecyclerView.ItemDecoration() {
-                @Override
-                public void onDraw(@NonNull Canvas canvas, @NonNull RecyclerView parent,
-                                   @NonNull RecyclerView.State state) {
-                    onPreDraw.run();
-                }
-            });
-        }
-
-        @Override
-        public void addOnScrollChangedListener(@NonNull Runnable onScrollChanged) {
-            mView.addOnScrollListener(new RecyclerView.OnScrollListener() {
-                @Override
-                public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
-                    onScrollChanged.run();
-                }
-            });
-        }
-
-        @Override
-        public void addOnTouchEventListener(@NonNull Predicate<MotionEvent> onTouchEvent) {
-            mView.addOnItemTouchListener(new RecyclerView.SimpleOnItemTouchListener() {
-                @Override
-                public boolean onInterceptTouchEvent(@NonNull RecyclerView recyclerView,
-                                                     @NonNull MotionEvent event) {
-                    return onTouchEvent.test(event);
-                }
-                @Override
-                public void onTouchEvent(@NonNull RecyclerView recyclerView,
-                                         @NonNull MotionEvent event) {
-                    onTouchEvent.test(event);
-                }
-            });
-        }
-
-        @Override
-        public int getScrollRange() {
-            int itemCount = getItemCount();
-            if (itemCount == 0) {
-                return 0;
-            }
-            int itemHeight = getItemHeight();
-            if (itemHeight == 0) {
-                return 0;
-            }
-            return mView.getPaddingTop() + itemCount * itemHeight + mView.getPaddingBottom();
-        }
-
-        @Override
-        public int getScrollOffset() {
-            int firstItemPosition = getFirstItemPosition();
-            if (firstItemPosition == RecyclerView.NO_POSITION) {
-                return 0;
-            }
-            int itemHeight = getItemHeight();
-            int firstItemTop = getFirstItemOffset();
-            return mView.getPaddingTop() + firstItemPosition * itemHeight - firstItemTop;
-        }
-
-        @Override
-        public void scrollTo(int offset) {
-            // Stop any scroll in progress for RecyclerView.
-            mView.stopScroll();
-            offset -= mView.getPaddingTop();
-            int itemHeight = getItemHeight();
-            // firstItemPosition should be non-negative even if paddingTop is greater than item height.
-            int firstItemPosition = Math.max(0, offset / itemHeight);
-            int firstItemTop = firstItemPosition * itemHeight - offset;
-            scrollToPositionWithOffset(firstItemPosition, firstItemTop);
-        }
-
-        @Nullable
-        @Override
-        public String getPopupText() {
-            RecyclerView.Adapter<?> adapter = mView.getAdapter();
-            if (!(adapter instanceof PopupTextProvider)) {
-                return null;
-            }
-            PopupTextProvider popupTextProvider = (PopupTextProvider) adapter;
-            int position = getFirstItemAdapterPosition();
-            if (position == RecyclerView.NO_POSITION) {
-                return null;
-            }
-            return popupTextProvider.getPopupText(position);
-        }
-
-        private int getItemCount() {
-            LinearLayoutManager linearLayoutManager = getVerticalLinearLayoutManager();
-            if (linearLayoutManager == null) {
-                return 0;
-            }
-            int itemCount = linearLayoutManager.getItemCount();
-            if (itemCount == 0) {
-                return 0;
-            }
-            if (linearLayoutManager instanceof GridLayoutManager) {
-                GridLayoutManager gridLayoutManager = (GridLayoutManager) linearLayoutManager;
-                itemCount = (itemCount - 1) / gridLayoutManager.getSpanCount() + 1;
-            }
-            return itemCount;
-        }
-
-        private int getItemHeight() {
-            if (mView.getChildCount() == 0) {
-                return 0;
-            }
-            View itemView = mView.getChildAt(0);
-            mView.getDecoratedBoundsWithMargins(itemView, mTempRect);
-            return mTempRect.height();
-        }
-
-        private int getFirstItemPosition() {
-            int position = getFirstItemAdapterPosition();
-            LinearLayoutManager linearLayoutManager = getVerticalLinearLayoutManager();
-            if (linearLayoutManager == null) {
-                return RecyclerView.NO_POSITION;
-            }
-            if (linearLayoutManager instanceof GridLayoutManager) {
-                GridLayoutManager gridLayoutManager = (GridLayoutManager) linearLayoutManager;
-                position /= gridLayoutManager.getSpanCount();
-            }
-            return position;
-        }
-
-        private int getFirstItemAdapterPosition() {
-            if (mView.getChildCount() == 0) {
-                return RecyclerView.NO_POSITION;
-            }
-            View itemView = mView.getChildAt(0);
-            LinearLayoutManager linearLayoutManager = getVerticalLinearLayoutManager();
-            if (linearLayoutManager == null) {
-                return RecyclerView.NO_POSITION;
-            }
-            return linearLayoutManager.getPosition(itemView);
-        }
-
-        private int getFirstItemOffset() {
-            if (mView.getChildCount() == 0) {
-                return RecyclerView.NO_POSITION;
-            }
-            View itemView = mView.getChildAt(0);
-            mView.getDecoratedBoundsWithMargins(itemView, mTempRect);
-            return mTempRect.top;
-        }
-
-        private void scrollToPositionWithOffset(int position, int offset) {
-            LinearLayoutManager linearLayoutManager = getVerticalLinearLayoutManager();
-            if (linearLayoutManager == null) {
-                return;
-            }
-            if (linearLayoutManager instanceof GridLayoutManager) {
-                GridLayoutManager gridLayoutManager = (GridLayoutManager) linearLayoutManager;
-                position *= gridLayoutManager.getSpanCount();
-            }
-            // LinearLayoutManager actually takes offset from paddingTop instead of top of RecyclerView.
-            offset -= mView.getPaddingTop();
-            linearLayoutManager.scrollToPositionWithOffset(position, offset);
-        }
-
-        @Nullable
-        private LinearLayoutManager getVerticalLinearLayoutManager() {
-            RecyclerView.LayoutManager layoutManager = mView.getLayoutManager();
-            if (!(layoutManager instanceof LinearLayoutManager)) {
-                return null;
-            }
-            LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
-            if (linearLayoutManager.getOrientation() != RecyclerView.VERTICAL) {
-                return null;
-            }
-            return linearLayoutManager;
-        }
-    }
-
-    private class ViewHelper extends RecyclerViewHelper {
-
-        ViewHelper(@NonNull RecyclerView view) {
-            super(view);
-        }
-
-        @Override
-        public void addOnTouchEventListener(@NonNull Predicate<MotionEvent> onTouchEvent) {
-            mPhantomOnItemTouchListener = new RecyclerView.SimpleOnItemTouchListener() {
-                @Override
-                public boolean onInterceptTouchEvent(@NonNull RecyclerView recyclerView,
-                                                     @NonNull MotionEvent event) {
-                    return onTouchEvent.test(event);
-                }
-
-                @Override
-                public void onTouchEvent(@NonNull RecyclerView recyclerView,
-                                         @NonNull MotionEvent event) {
-                    onTouchEvent.test(event);
-                }
-            };
-        }
-    }
-}
diff --git a/app/src/main/java/com/zeapo/pwdstore/PasswordFragment.kt b/app/src/main/java/com/zeapo/pwdstore/PasswordFragment.kt
index 1b9d3f9c..ecf1a887 100644
--- a/app/src/main/java/com/zeapo/pwdstore/PasswordFragment.kt
+++ b/app/src/main/java/com/zeapo/pwdstore/PasswordFragment.kt
@@ -19,9 +19,7 @@ import androidx.appcompat.view.ActionMode
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.observe
-import androidx.recyclerview.widget.FixOnItemTouchDispatchRecyclerView
 import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import com.google.android.material.snackbar.Snackbar
 import com.zeapo.pwdstore.databinding.PasswordRecyclerViewBinding
 import com.zeapo.pwdstore.git.BaseGitActivity
@@ -38,9 +36,7 @@ import me.zhanghai.android.fastscroll.FastScrollerBuilder
 
 class PasswordFragment : Fragment() {
     private lateinit var recyclerAdapter: PasswordItemRecyclerAdapter
-    private lateinit var recyclerView: FixOnItemTouchDispatchRecyclerView
     private lateinit var listener: OnFragmentInteractionListener
-    private lateinit var swipeRefresher: SwipeRefreshLayout
 
     private var recyclerViewStateToRestore: Parcelable? = null
     private var actionMode: ActionMode? = null
@@ -67,8 +63,7 @@ class PasswordFragment : Fragment() {
     }
 
     private fun initializePasswordList() {
-        swipeRefresher = binding.swipeRefresher
-        swipeRefresher.setOnRefreshListener {
+        binding.swipeRefresher.setOnRefreshListener {
             if (!PasswordRepository.isGitRepo()) {
                 Snackbar.make(binding.root, getString(R.string.clone_git_repo), Snackbar.LENGTH_INDEFINITE)
                         .setAction(R.string.clone_button) {
@@ -77,7 +72,7 @@ class PasswordFragment : Fragment() {
                             startActivityForResult(intent, BaseGitActivity.REQUEST_CLONE)
                         }
                         .show()
-                swipeRefresher.isRefreshing = false
+                binding.swipeRefresher.isRefreshing = false
             } else {
                 val intent = Intent(context, GitOperationActivity::class.java)
                 intent.putExtra(BaseGitActivity.REQUEST_ARG_OP, BaseGitActivity.REQUEST_SYNC)
@@ -92,7 +87,7 @@ class PasswordFragment : Fragment() {
             .onSelectionChanged { selection ->
                 // In order to not interfere with drag selection, we disable the SwipeRefreshLayout
                 // once an item is selected.
-                swipeRefresher.isEnabled = selection.isEmpty
+                binding.swipeRefresher.isEnabled = selection.isEmpty
 
                 if (actionMode == null)
                     actionMode = requireStore().startSupportActionMode(actionModeCallback)
@@ -105,7 +100,7 @@ class PasswordFragment : Fragment() {
                     actionMode!!.finish()
                 }
             }
-        recyclerView = binding.passRecycler
+        val recyclerView = binding.passRecycler
         recyclerView.apply {
             layoutManager = LinearLayoutManager(requireContext())
             itemAnimator = OnOffItemAnimator()
@@ -232,7 +227,7 @@ class PasswordFragment : Fragment() {
                         requireStore().clearSearch()
                         model.navigateTo(
                             item.file,
-                            recyclerViewState = recyclerView.layoutManager!!.onSaveInstanceState()
+                            recyclerViewState = binding.passRecycler.layoutManager!!.onSaveInstanceState()
                         )
                         requireStore().supportActionBar?.setDisplayHomeAsUpEnabled(true)
                     } else {
@@ -250,7 +245,7 @@ class PasswordFragment : Fragment() {
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        swipeRefresher.isRefreshing = false
+        binding.swipeRefresher.isRefreshing = false
     }
 
     /**