Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkContentView.java

+// Copyright 2015 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.enhancedbookmarks;
+
+import android.animation.ObjectAnimator;
+import android.content.Context;
+import android.support.v7.widget.RecyclerView;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewTreeObserver.OnScrollChangedListener;
+import android.widget.RelativeLayout;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.chrome.browser.widget.FadingShadow;
+import org.chromium.chrome.browser.widget.FadingShadowView;
+import org.chromium.components.bookmarks.BookmarkId;
+import org.chromium.ui.interpolators.BakedBezierInterpolator;
+
+import java.util.List;
+
+/**
+ * A ViewGroup that holds an {@link EnhancedBookmarkActionBar}, a {@link FadingShadowView}, a
+ * {@link EnhancedBookmarkRecyclerView} and a {@link EnhancedBookmarkLoadingView}. On large
+ * tablet, it can be replaced by a {@link EnhancedBookmarkSearchView} with the same size, located at
+ * the right of the window.
+ */
+public class EnhancedBookmarkContentView extends RelativeLayout implements
+        EnhancedBookmarkUIObserver {
+    private static final int SHADOW_ANIMATION_DURATION_MS = 500;
+    private EnhancedBookmarkDelegate mDelegate;
+    private EnhancedBookmarkRecyclerView mItemsContainer;
+    private EnhancedBookmarkActionBar mActionBar;
+    private FadingShadowView mShadow;
+    private EnhancedBookmarkLoadingView mLoadingView;
+    private ObjectAnimator mShadowInAnim;
+
+    private OnScrollChangedListener mScrollListener = new OnScrollChangedListener() {
+        @Override
+        public void onScrollChanged() {
+            if (mShadow == null || mDelegate == null || mDelegate.isSelectionEnabled()
+                    || mDelegate.isListModeEnabled()) return;
+            int firstPosition = mItemsContainer.getLayoutManager()
+                    .findFirstCompletelyVisibleItemPosition();
+            if (firstPosition == 0 || firstPosition == RecyclerView.NO_POSITION) {
+                if (mShadowInAnim.isStarted()) mShadowInAnim.cancel();
+                mShadow.setStrength(0);
+            } else {
+                if (!mShadowInAnim.isStarted() && mShadow.getStrength() < 1.0f) {
+                    mShadowInAnim.start();
+                }
+            }
+        }
+    };
+
+    /**
+     * Creates an instance of {@link EnhancedBookmarkContentView}. This constructor should be used
+     * by the framework when inflating from XML.
+     */
+    public EnhancedBookmarkContentView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        mItemsContainer = (EnhancedBookmarkRecyclerView) findViewById(
+                R.id.eb_items_container);
+        mItemsContainer.setEmptyView(findViewById(R.id.eb_empty_view));
+        mItemsContainer.getViewTreeObserver().addOnScrollChangedListener(mScrollListener);
+        mActionBar = (EnhancedBookmarkActionBar) findViewById(R.id.eb_action_bar);
+        mLoadingView = (EnhancedBookmarkLoadingView) findViewById(R.id.eb_initial_loading_view);
+        mShadow = (FadingShadowView) findViewById(R.id.shadow);
+        mShadow.init(getResources().getColor(R.color.enhanced_bookmark_app_bar_shadow_color),
+                FadingShadow.POSITION_TOP);
+        mShadowInAnim = ObjectAnimator.ofFloat(mShadow, "Strength", 1.0f)
+                .setDuration(SHADOW_ANIMATION_DURATION_MS);
+        mShadowInAnim.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);
+    }
+
+    /**
+     * Handles the event when user clicks back button and the UI is in selection mode.
+     * @return True if there are selected bookmarks, and the back button is processed by this
+     *         method. False otherwise.
+     */
+    public boolean onBackPressed() {
+        if (mDelegate != null && mDelegate.isSelectionEnabled()) {
+            mDelegate.clearSelection();
+            return true;
+        }
+        return false;
+    }
+
+    void showLoadingUi() {
+        mActionBar.showLoadingUi();
+        mLoadingView.showLoadingUI();
+    }
+
+    // EnhancedBookmarkDelegate implementations.
+
+    @Override
+    public void onEnhancedBookmarkDelegateInitialized(EnhancedBookmarkDelegate delegate) {
+        mDelegate = delegate;
+        mDelegate.addUIObserver(this);
+        mItemsContainer.onEnhancedBookmarkDelegateInitialized(mDelegate);
+        mActionBar.onEnhancedBookmarkDelegateInitialized(mDelegate);
+    }
+
+    @Override
+    public void onAllBookmarksStateSet() {
+        mLoadingView.hideLoadingUI();
+    }
+
+    @Override
+    public void onFolderStateSet(BookmarkId folder) {
+        mLoadingView.hideLoadingUI();
+    }
+
+    @Override
+    public void onFilterStateSet(String filter) {
+        mLoadingView.hideLoadingUI();
+    }
+
+    @Override
+    public void onSelectionStateChange(List<BookmarkId> selectedBookmarks) {
+        if (!selectedBookmarks.isEmpty()) mShadow.setStrength(1.0f);
+        else mScrollListener.onScrollChanged();
+    }
+
+    @Override
+    public void onDestroy() {
+        mDelegate.removeUIObserver(this);
+    }
+
+    @Override
+    public void onListModeChange(boolean isListModeEnabled) {
+        if (EnhancedBookmarkRecyclerView.isLargeTablet(getContext())) {
+            if (isListModeEnabled) mShadow.setVisibility(View.GONE);
+            else mShadow.setVisibility(View.VISIBLE);
+        }
+        mShadow.setStrength(mDelegate.isListModeEnabled() ? 1.0f : 0.0f);
+    }
+}