implementation for new duplicate download UI

chrome/android/java/src/org/chromium/chrome/browser/infobar/DuplicateDownloadInfoBar.java

+// Copyright 2016 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.infobar;
+
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Typeface;
+import android.net.Uri;
+import android.text.Spannable;
+import android.text.SpannableString;
+import android.text.TextUtils;
+import android.text.style.ClickableSpan;
+import android.text.style.StyleSpan;
+import android.view.View;
+import android.webkit.MimeTypeMap;
+
+import org.chromium.base.ContextUtils;
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.download.DownloadUtils;
+
+import java.io.File;
+
+/**
+ * An infobar to ask whether to proceed downloading a file that already exists locally.
+ */
+public class DuplicateDownloadInfoBar extends ConfirmInfoBar {
+    private static final String TAG = "DuplicateDownloadInfoBar";
+    private final String mFilePath;
+    private final boolean mIsOfflinePage;
+    private final String mPageUrl;
+    private final boolean mIsIncognito;
+
+    @CalledByNative
+    private static InfoBar createInfoBar(
+            String filePath, boolean isOfflinePage, String pageUrl, boolean isIncognito) {
+        return new DuplicateDownloadInfoBar(
+                ContextUtils.getApplicationContext(), filePath, isOfflinePage, pageUrl,
+                isIncognito);
+    }
+
+    /**
+     * Constructs DuplicateDownloadInfoBar.
+     * @param context Application context.
+     * @param filePath The file path.
+     * @param isOfflinePage Whether the download is for offline page.
+     * @param pageUrl Url of the page, ignored if this is a regular download.
+     * @param isIncognito Whether download is Incognito.
+     */
+    private DuplicateDownloadInfoBar(
+            Context context, String filePath, boolean isOfflinePage, String pageUrl,
+            boolean isIncognito) {
+        super(R.drawable.infobar_downloading, null, null, null,
+                context.getString(R.string.duplicate_download_infobar_download_button),
+                context.getString(R.string.cancel));
+        mFilePath = filePath;
+        mIsOfflinePage = isOfflinePage;
+        mPageUrl = pageUrl;
+        mIsIncognito = isIncognito;
+    }
+
+    /**
+     * Gets the infobar text for regular downloads.
+     * @param context Context to be used.
+     * @param template Template of the text to be displayed.
+     */
+    private CharSequence getDownloadMessageText(final Context context, final String template) {
+        final File file = new File(mFilePath);
+        final Uri fileUri = Uri.fromFile(file);
+        final String mimeType = getMimeTypeFromUri(fileUri);
+        final String filename = file.getName();
+        return getMessageText(template, filename, new ClickableSpan() {
+            @Override
+            public void onClick(View view) {
+                DownloadUtils.openFile(file, mimeType, mIsIncognito);
+            }
+        });
+    }
+
+    /**
+     * Gets the infobar text for offline page downloads.
+     * @param context Context to be used.
+     * @param template Template of the text to be displayed.
+     */
+    private CharSequence getOfflinePageMessageText(final Context context, final String template) {
+        return getMessageText(template, mFilePath, new ClickableSpan() {
+            @Override
+            public void onClick(View view) {
+                // TODO(qinmin): open the offline page on local storage instead of opening the url.
+                // However, there could be multiple stored offline pages for the same url, need to
+                // figure out which one to use.
+                Intent intent = new Intent(Intent.ACTION_VIEW);
+                intent.setData(Uri.parse(mPageUrl));
+                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                intent.setPackage(context.getPackageName());
+                context.startActivity(intent);
+            }
+        });
+    }
+
+    /**
+     * Helper method to get the text to be displayed on the infobar.
+     * @param template Message template.
+     * @param fileName Name of the file.
+     * @param clickableSpan Action to perform when clicking on the file name.
+     * @return message to be displayed on the infobar.
+     */
+    private CharSequence getMessageText(final String template, final String fileName,
+            final ClickableSpan clickableSpan) {
+        final SpannableString formattedFilePath = new SpannableString(fileName);
+        formattedFilePath.setSpan(new StyleSpan(Typeface.BOLD), 0, fileName.length(),
+                Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        formattedFilePath.setSpan(clickableSpan, 0, fileName.length(),
+                Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        return TextUtils.expandTemplate(template, formattedFilePath);
+    }
+
+    /**
+     * Retrieve the mime type based on the given file URI.
+     * @param fileUri URI of the file
+     * @return Possible mime type of the file.
+     */
+    private static String getMimeTypeFromUri(Uri fileUri) {
+        String extension = MimeTypeMap.getSingleton().getFileExtensionFromUrl(fileUri.toString());
+        return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
+    }
+
+    @Override
+    public void createContent(InfoBarLayout layout) {
+        super.createContent(layout);
+        Context context = layout.getContext();
+        if (mIsOfflinePage) {
+            layout.setMessage(getOfflinePageMessageText(
+                    context, context.getString(R.string.duplicate_download_infobar_text)));
+        } else {
+            layout.setMessage(getDownloadMessageText(
+                    context, context.getString(R.string.duplicate_download_infobar_text)));
+        }
+    }
+}