[Download Home] Displaying offline page bundle per day

chrome/android/java/src/org/chromium/chrome/browser/download/ui/OfflineGroupHeaderView.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.download.ui;
+
+import android.content.Context;
+import android.text.format.Formatter;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import org.chromium.chrome.R;
+
+/** A header that presents users the option to view or hide the suggested offline pages. */
+public class OfflineGroupHeaderView extends FrameLayout {
+    private TextView mPageCountHeader;
+    private TextView mFileSizeView;
+    private ImageView mImageView;
+
+    private DownloadItemGroup mGroup;
+    private DownloadHistoryAdapter mAdapter;
+
+    public OfflineGroupHeaderView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if (mGroup.isSuggestedOfflinePagesSectionExpanded()) {
+                    mAdapter.collapseSuggestedPagesHeader(mGroup);
+                    mImageView.setImageResource(R.drawable.ic_expanded);
+                } else {
+                    mAdapter.expandSuggestedPagesHeader(mGroup);
+                    mImageView.setImageResource(R.drawable.ic_collapsed);
+                }

[Theresa, 2017/02/10 00:55:12]

The expand icon should have a content description for TalkBack to read out e.g.
"Tap to expand" or "Tap to collapse" (may be good to check with UX/accessibility
folks on this). 

[shaktisahu, 2017/02/11 00:39:06]

Done.

+            }
+        });
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        mPageCountHeader = (TextView) findViewById(R.id.page_count_text);
+        mFileSizeView = (TextView) findViewById(R.id.filesize_view);
+        mImageView = (ImageView) findViewById(R.id.expand_icon);
+    }
+
+    /**
+     * Associates this view with the adapter and the corresponding group.
+     * @param group The group associated with this header.
+     * @param adapter The adapter associated with this header.
+     */
+    public void bindGroupAndAdapter(DownloadItemGroup group, DownloadHistoryAdapter adapter) {
+        mGroup = group;
+        mAdapter = adapter;
+        updateTitleText(group.getSuggestedOfflinePageCount());
+        mImageView.setImageResource(mGroup.isSuggestedOfflinePagesSectionExpanded()
+                        ? R.drawable.ic_collapsed
+                        : R.drawable.ic_expanded);
+    }
+
+    private void updateTitleText(int pageCount) {
+        mPageCountHeader.setText(getResources().getString(
+                R.string.download_manager_offline_header_title, pageCount));
+        mFileSizeView.setText(
+                Formatter.formatFileSize(getContext(), mGroup.getSuggestedOfflinePagesFileSize()));
+    }
+}