[Android] Prompt with infobar on filename conflict

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

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/DownloadOverwriteInfoBar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/DownloadOverwriteInfoBar.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/DownloadOverwriteInfoBar.java
new file mode 100644
index 0000000000000000000000000000000000000000..86910d830fbd3ca49b2e71254b707fa5a7b7b60d
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/DownloadOverwriteInfoBar.java
@@ -0,0 +1,136 @@
+// 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.infobar;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+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 org.chromium.chrome.R;
+
+import java.util.List;
+
+/**
+ * An infobar to ask whether to overwrite an existing file with a new download.
+ */
+public class DownloadOverwriteInfoBar extends InfoBar {
+    private static final String TAG = "DownloadOverwriteInfoBar";
+
+    /**
+     * Java-side callback that can be used when this infobar was created by Java component.
+     */
+    public interface Callback {

[Ted C, 2015/02/20 01:48:08]

FWIW, I think you should always more verbosely qualify internal Callbacks
because it becomes very hard to understand them outside the class (i.e.
DownloadOverwriteCallback).

With that said, I "hope" there is a way we can do this without the callback and
from native.

[Changwan Ryu, 2015/02/23 06:50:37]

Done.

+        /**
+         * Called when close button is clicked.
+         */
+        void onCloseButtonClicked(DownloadOverwriteInfoBar infoBar);
+        /**
+         * Called when a button is clicked.
+         * @param action Action type defined in {@link InfoBar}.
+         */
+        void onAction(DownloadOverwriteInfoBar infoBar, int action);
+    }
+
+    private final Callback mCallback;
+    private final String mFileName;
+    private final String mDirName;
+    private final String mDirFullPath;
+
+    /**
+     * Constructs DownloadOverwriteInfoBar.
+     * @param nativeInfoBarPtr Pointer value of the native infobar. 0 if there is no native
+     * counterpart.
+     * @param callback Java-side callback. Null if it was created from native side.
+     * @param fileName The file name. ex) example.jpg
+     * @param dirName The dir name. ex) Downloads
+     * @param dirFullPath The full dir path. ex) sdcards/Downloads
+     */
+    public DownloadOverwriteInfoBar(long nativeInfoBarPtr, Callback callback, String fileName,
+            String dirName, String dirFullPath) {
+        super(null, R.drawable.infobar_downloading, null, null);
+        mCallback = callback;
+        mFileName = fileName;
+        mDirName = dirName;
+        mDirFullPath = dirFullPath;
+        setNativeInfoBar(nativeInfoBarPtr);
+    }
+
+    @Override
+    public void onCloseButtonClicked() {
+        if (mNativeInfoBarPtr != 0) nativeOnCloseButtonClicked(mNativeInfoBarPtr);
+        if (mCallback != null) mCallback.onCloseButtonClicked(this);
+    }
+
+    @Override
+    public void onButtonClicked(boolean isPrimaryButton) {
+        int action = isPrimaryButton ? InfoBar.ACTION_TYPE_OVERWRITE
+                                     : InfoBar.ACTION_TYPE_CREATE_NEW_FILE;

[Ted C, 2015/02/20 01:48:08]

this is C++ style indenting and it should be 8 from the start of the previous
line.

[Changwan Ryu, 2015/02/23 06:50:37]

Done.

+        if (mNativeInfoBarPtr != 0) nativeOnButtonClicked(mNativeInfoBarPtr, action, "");
+        if (mCallback != null) mCallback.onAction(this, action);
+    }
+
+    private CharSequence getMessageText(Context context) {
+        String template = context.getString(R.string.download_overwrite_infobar_text);
+        Intent intent = getIntentForDirectoryLaunch(mDirFullPath);
+        return formatInfoBarMessage(context, template, mFileName, mDirName, intent);
+    }
+
+    private static Intent getIntentForDirectoryLaunch(String dirFullPath) {

[qinmin, 2015/02/20 01:00:40]

javadoc here and below

[Changwan Ryu, 2015/02/23 06:50:37]

Done.

+        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
+        Uri uri = Uri.parse(dirFullPath);
+        if (uri == null) {
+            return null;
+        }
+        intent.setDataAndType(uri, "*/*");
+        return intent;
+    }
+
+    @Override
+    public void createContent(InfoBarLayout layout) {
+        Context context = layout.getContext();
+        layout.setMessage(getMessageText(context));
+        layout.setButtons(
+                context.getString(R.string.download_overwrite_infobar_replace_file_button),
+                context.getString(R.string.download_overwrite_infobar_create_new_file_button));
+    }
+
+    private static CharSequence formatInfoBarMessage(final Context context, String template,
+            String fileName, String dirName, final Intent dirNameIntent) {
+        SpannableString formattedFileName = new SpannableString(fileName);
+        formattedFileName.setSpan(new StyleSpan(Typeface.BOLD), 0, fileName.length(),
+                Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+
+        SpannableString formattedDirName = new SpannableString(dirName);
+        if (canResolveIntent(context, dirNameIntent)) {
+            formattedDirName.setSpan(new ClickableSpan() {
+                @Override
+                public void onClick(View view) {
+                    context.startActivity(dirNameIntent);
+                }
+            }, 0, dirName.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+
+        return TextUtils.expandTemplate(template, formattedFileName, formattedDirName);
+    }
+
+    private static boolean canResolveIntent(Context context, Intent intent) {
+        if (context == null || intent == null) {
+            return false;
+        }
+        final PackageManager packageManager = context.getPackageManager();
+        List<ResolveInfo> resolveInfoList =
+                packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
+        return resolveInfoList.size() > 0;
+    }
+}