Refactor ShortcutHelper and merge in BookmarkUtils

chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
index ec1ffdabc0c7d2dde778cf21628f575e05dc5f3c..ecb2acdea553ba595f9bc8bddd9d754555f935c8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
@@ -4,24 +4,42 @@
 
 package org.chromium.chrome.browser;
 
+import android.app.ActivityManager;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
 import android.os.Handler;
 import android.os.Looper;
 import android.util.Base64;
+import android.util.DisplayMetrics;
+import android.util.TypedValue;
 
+import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.ApplicationStatus;
+import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.R;
-import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.webapps.WebappLauncherActivity;
-import org.chromium.content_public.browser.WebContents;
+import org.chromium.chrome.browser.widget.RoundedIconGenerator;
 import org.chromium.content_public.common.ScreenOrientationConstants;
 import org.chromium.ui.widget.Toast;
 
 import java.io.ByteArrayOutputStream;
+import java.util.List;
 import java.util.UUID;
 
 /**
@@ -41,18 +59,22 @@ public class ShortcutHelper {
     public static final String EXTRA_THEME_COLOR = "org.chromium.chrome.browser.theme_color";
     public static final String EXTRA_BACKGROUND_COLOR =
             "org.chromium.chrome.browser.background_color";
+    public static final String REUSE_URL_MATCHING_TAB_ELSE_NEW_TAB =
+            "REUSE_URL_MATCHING_TAB_ELSE_NEW_TAB";
 
     // This value is equal to kInvalidOrMissingColor in the C++ content::Manifest struct.
     public static final long MANIFEST_COLOR_INVALID_OR_MISSING = ((long) Integer.MAX_VALUE) + 1;
 
-    /** Observes the data fetching pipeline. */
-    public interface ShortcutHelperObserver {
-        /** Called when the title of the page is available. */
-        void onUserTitleAvailable(String title);
-
-        /** Called when the icon to use in the launcher is available. */
-        void onIconAvailable(Bitmap icon);
-    }
+    private static final String TAG = "cr.Shortcuts";
+    // There is no public string defining this intent so if Home changes the value, we
+    // have to update this string.
+    private static final String INSTALL_SHORTCUT = "com.android.launcher.action.INSTALL_SHORTCUT";
+    private static final int DEFAULT_RGB_VALUE = 145;
+    private static final int INSET_DIMENSION_FOR_TOUCHICON = 1;
+    private static final int TOUCHICON_BORDER_RADII_DP = 4;
+    private static final int GENERATED_ICON_SIZE_DP = 40;
+    private static final int GENERATED_ICON_ROUNDED_CORNERS_DP = 2;
+    private static final int GENERATED_ICON_FONT_SIZE_DP = 16;
 
     /** Broadcasts Intents out Android for adding the shortcut. */
     public static class Delegate {
@@ -75,47 +97,6 @@ public class ShortcutHelper {
 
     private static Delegate sDelegate = new Delegate();
 
-    private final Context mAppContext;
-    private final Tab mTab;
-
-    private ShortcutHelperObserver mObserver;
-    private boolean mIsInitialized;
-    private long mNativeShortcutHelper;
-
-    public ShortcutHelper(Context appContext, Tab tab) {
-        mAppContext = appContext;
-        mTab = tab;
-    }
-
-    /**
-     * Gets all the information required to initialize the UI.  The observer will be notified as
-     * information required for the shortcut become available.
-     * @param observer Observer to notify.
-     */
-    public void initialize(ShortcutHelperObserver observer) {
-        mObserver = observer;
-        mNativeShortcutHelper = nativeInitialize(mTab.getWebContents());
-    }
-
-    /**
-     * Returns whether the object is initialized.
-     */
-    public boolean isInitialized() {
-        return mIsInitialized;
-    }
-
-    /**
-     * Puts the object in a state where it is safe to be destroyed.
-     */
-    public void destroy() {
-        nativeDestroy(mNativeShortcutHelper);
-
-        // Make sure the callback isn't run if the tear down happens before
-        // onInitialized() is called.
-        mObserver = null;
-        mNativeShortcutHelper = 0;
-    }
-
     /**
      * Sets the delegate to use.
      */
@@ -124,35 +105,6 @@ public class ShortcutHelper {
         sDelegate = delegate;
     }
 
-    @CalledByNative
-    private void onUserTitleAvailable(String title) {
-        mObserver.onUserTitleAvailable(title);
-    }
-
-    @CalledByNative
-    private void onIconAvailable(Bitmap icon) {
-        mObserver.onIconAvailable(icon);
-        mIsInitialized = true;
-    }
-
-    /**
-     * Adds a shortcut for the current Tab.
-     * @param userRequestedTitle Updated title for the shortcut.
-     */
-    public void addShortcut(String userRequestedTitle) {
-        nativeAddShortcut(mNativeShortcutHelper, userRequestedTitle);
-    }
-
-    /**
-     * Creates an icon that is acceptable to show on the launcher.
-     */
-    @CalledByNative
-    private static Bitmap finalizeLauncherIcon(
-            String url, Bitmap icon, int red, int green, int blue) {
-        return BookmarkUtils.createLauncherIcon(
-                ApplicationStatus.getApplicationContext(), icon, url, red, green, blue);
-    }
-
     /**
      * Called when we have to fire an Intent to add a shortcut to the homescreen.
      * If the webpage indicated that it was capable of functioning as a webapp, it is added as a
@@ -189,7 +141,7 @@ public class ShortcutHelper {
             shortcutIntent.putExtra(EXTRA_BACKGROUND_COLOR, backgroundColor);
         } else {
             // Add the shortcut as a launcher icon to open in the browser Activity.
-            shortcutIntent = BookmarkUtils.createShortcutIntent(url);
+            shortcutIntent = createShortcutIntent(url);
         }
 
         // Always attach a source (one of add to homescreen menu item, app banner, or unknown) to
@@ -197,7 +149,7 @@ public class ShortcutHelper {
         shortcutIntent.putExtra(EXTRA_SOURCE, source);
         shortcutIntent.setPackage(context.getPackageName());
         sDelegate.sendBroadcast(
-                context, BookmarkUtils.createAddToHomeIntent(shortcutIntent, userTitle, icon, url));
+                context, createAddToHomeIntent(url, userTitle, icon, shortcutIntent));
 
         // Alert the user about adding the shortcut.
         final String shortUrl = UrlUtilities.getDomainAndRegistry(url, true);
@@ -215,6 +167,163 @@ public class ShortcutHelper {
     }
 
     /**
+     * Creates an intent that will add a shortcut to the home screen.
+     * @param shortcutIntent Intent to fire when the shortcut is activated.
+     * @param url URL of the shortcut.
+     * @param title Title of the shortcut.
+     * @param icon Image that represents the shortcut.
+     * @return Intent for the shortcut.
+     */
+    public static Intent createAddToHomeIntent(String url, String title,
+            Bitmap icon, Intent shortcutIntent) {
+        Intent i = new Intent(INSTALL_SHORTCUT);
+        i.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
+        i.putExtra(Intent.EXTRA_SHORTCUT_NAME, title);
+        i.putExtra(Intent.EXTRA_SHORTCUT_ICON, icon);
+        return i;
+    }
+
+    /**
+     * Creates an intent that will add a shortcut to the home screen.
+     * @param url Url of the shortcut.
+     * @param title Title of the shortcut.
+     * @param icon Image that represents the shortcut.
+     * @return Intent for the shortcut.
+     */
+    public static Intent createAddToHomeIntent(String url, String title, Bitmap icon) {
+        Intent shortcutIntent = createShortcutIntent(url);
+        return createAddToHomeIntent(url, title, icon, shortcutIntent);
+    }
+
+    /**
+     * Shortcut intent for icon on homescreen.
+     * @param url Url of the shortcut.
+     * @return Intent for onclick action of the shortcut.
+     */
+    public static Intent createShortcutIntent(String url) {
+        Intent shortcutIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+        shortcutIntent.putExtra(REUSE_URL_MATCHING_TAB_ELSE_NEW_TAB, true);
+        return shortcutIntent;
+    }
+
+    /**
+     * Utility method to check if a shortcut can be added to the homescreen.
+     * @param context Context used to get the package manager.
+     * @return if a shortcut can be added to the homescreen under the current profile.
+     */
+    public static boolean isAddToHomeIntentSupported(Context context) {
+        PackageManager pm = context.getPackageManager();
+        Intent i = new Intent(INSTALL_SHORTCUT);
+        List<ResolveInfo> receivers = pm.queryBroadcastReceivers(
+                i, PackageManager.GET_INTENT_FILTERS);
+        return !receivers.isEmpty();
+    }
+
+    /**
+     * Creates an icon to be associated with this shortcut. If available, the touch icon
+     * will be used, else we draw our own.
+     * @param context Context used to create the intent.
+     * @param icon Image representing the shortcut.
+     * @param url URL of the shortcut.
+     * @param rValue Red component of the dominant icon color.
+     * @param gValue Green component of the dominant icon color.
+     * @param bValue Blue component of the dominant icon color.
+     * @return Bitmap Either the touch-icon or the newly created favicon.
+     */
+    public static Bitmap createLauncherIcon(Context context, Bitmap icon, String url, int rValue,
+            int gValue, int bValue) {
+        Bitmap bitmap = null;
+        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        final int iconSize = am.getLauncherLargeIconSize();
+        final int iconDensity = am.getLauncherLargeIconDensity();
+        try {
+            bitmap = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888);
+            Canvas canvas = new Canvas(bitmap);
+            if (icon == null) {
+                icon = getBitmapFromResourceId(context, R.drawable.globe_favicon, iconDensity);
+                rValue = gValue = bValue = DEFAULT_RGB_VALUE;
+            }
+            final int smallestSide = iconSize;
+            if (icon.getWidth() >= smallestSide / 2 && icon.getHeight() >= smallestSide / 2) {
+                drawTouchIconToCanvas(context, icon, canvas);
+            } else {
+                drawWidgetBackgroundToCanvas(context, canvas, iconDensity, url,
+                        Color.rgb(rValue, gValue, bValue));
+            }
+            canvas.setBitmap(null);
+        } catch (OutOfMemoryError e) {
+            Log.w(TAG, "OutOfMemoryError while trying to draw bitmap on canvas.");
+        }
+        return bitmap;
+    }
+
+    private static Bitmap getBitmapFromResourceId(Context context, int id, int density) {
+        Drawable drawable = ApiCompatibilityUtils.getDrawableForDensity(
+                context.getResources(), id, density);
+
+        if (drawable instanceof BitmapDrawable) {
+            BitmapDrawable bd = (BitmapDrawable) drawable;
+            return bd.getBitmap();
+        }
+        assert false : "The drawable was not a bitmap drawable as expected";
+        return null;
+    }
+
+    /**
+     * Use touch-icon or higher-resolution favicon and round the corners.
+     * @param context    Context used to get resources.
+     * @param touchIcon  Touch icon bitmap.
+     * @param canvas     Canvas that holds the touch icon.
+     */
+    private static void drawTouchIconToCanvas(Context context, Bitmap touchIcon, Canvas canvas) {
+        Rect iconBounds = new Rect(0, 0, canvas.getWidth(), canvas.getHeight());
+        Rect src = new Rect(0, 0, touchIcon.getWidth(), touchIcon.getHeight());
+        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
+        paint.setFilterBitmap(true);
+        canvas.drawBitmap(touchIcon, src, iconBounds, paint);
+        // Convert dp to px.
+        int borderRadii = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
+                TOUCHICON_BORDER_RADII_DP, context.getResources().getDisplayMetrics());
+        Path path = new Path();
+        path.setFillType(Path.FillType.INVERSE_WINDING);
+        RectF rect = new RectF(iconBounds);
+        rect.inset(INSET_DIMENSION_FOR_TOUCHICON, INSET_DIMENSION_FOR_TOUCHICON);
+        path.addRoundRect(rect, borderRadii, borderRadii, Path.Direction.CW);
+        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
+        canvas.drawPath(path, paint);
+    }
+
+    /**
+     * Draw document icon to canvas.
+     * @param context     Context used to get bitmap resources.
+     * @param canvas      Canvas that holds the document icon.
+     * @param iconDensity Density information to get bitmap resources.
+     * @param url         URL of the shortcut.
+     * @param color       Color for the document icon's folding and the bottom strip.
+     */
+    private static void drawWidgetBackgroundToCanvas(
+            Context context, Canvas canvas, int iconDensity, String url, int color) {
+        Rect iconBounds = new Rect(0, 0, canvas.getWidth(), canvas.getHeight());
+        Bitmap bookmarkWidgetBg =
+                getBitmapFromResourceId(context, R.mipmap.bookmark_widget_bg, iconDensity);
+
+        Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG);
+        canvas.drawBitmap(bookmarkWidgetBg, null, iconBounds, paint);
+
+        float density = (float) iconDensity / DisplayMetrics.DENSITY_MEDIUM;
+        int iconSize = (int) (GENERATED_ICON_SIZE_DP * density);
+        int iconRoundedEdge = (int) (GENERATED_ICON_ROUNDED_CORNERS_DP * density);
+        int iconFontSize = (int) (GENERATED_ICON_FONT_SIZE_DP * density);
+
+        RoundedIconGenerator generator = new RoundedIconGenerator(
+                iconSize, iconSize, iconRoundedEdge, color, iconFontSize);
+        Bitmap icon = generator.generateIconForUrl(url);
+        if (icon == null) return; // Bookmark URL does not have a domain.
+        canvas.drawBitmap(icon, iconBounds.exactCenterX() - icon.getWidth() / 2.0f,
+                iconBounds.exactCenterY() - icon.getHeight() / 2.0f, null);
+    }
+
+    /**
      * @return String that can be used to verify that a WebappActivity is being started by Chrome.
      */
     public static String getEncodedMac(Context context, String url) {
@@ -224,8 +333,4 @@ public class ShortcutHelper {
         byte[] mac = WebappAuthenticator.getMacForUrl(context, url);
         return Base64.encodeToString(mac, Base64.DEFAULT);
     }
-
-    private native long nativeInitialize(WebContents webContents);
-    private native void nativeAddShortcut(long nativeShortcutHelper, String userRequestedTitle);
-    private native void nativeDestroy(long nativeShortcutHelper);
 }