WidgetTray revamp work

- RecyclerView is rendering
- Animation is connected
- Drag and drop is now handled
- UI tweaking: background, margins, more to come.
- Flicker and preview not loading issue:
  fixed height for the horizontal scroll view.
- Shortcuts are added
- Widget Preview loading should support shortPress for drop
- UI tweaks left: overlay of arrow when there are more items to scroll
- icons are added in the section header
- Sorting of widget sections and widget horizontal list
- Adding all the padding constants to dimen.xml file
- RecyclerView should only support one view type

For items to be addressed in follow up patches OR CLs,
TODO is added to the comment.

b/19897708

Change-Id: Ibfc4da1696a23d20bada93db46e126706eb13cdc

src/com/android/launcher3/PendingAddItemInfo.java

@@ -16,93 +16,17 @@
 
 package com.android.launcher3;
 
-import android.appwidget.AppWidgetHostView;
 import android.content.ComponentName;
-import android.content.pm.ActivityInfo;
-import android.os.Bundle;
-import android.os.Parcelable;
 
 /**
- * We pass this object with a drag from the customization tray
+ * Meta data that is used for deferred binding.
+ * e.g., this object is used to pass information on dragable targets when they are dropped onto
+ * the workspace from another container.
  */
-class PendingAddItemInfo extends ItemInfo {
+public class PendingAddItemInfo extends ItemInfo {
+
     /**
      * The component that will be created.
      */
-    ComponentName componentName;
-}
-
-class PendingAddShortcutInfo extends PendingAddItemInfo {
-
-    ActivityInfo shortcutActivityInfo;
-
-    public PendingAddShortcutInfo(ActivityInfo activityInfo) {
-        shortcutActivityInfo = activityInfo;
-    }
-
-    @Override
-    public String toString() {
-        return "Shortcut: " + shortcutActivityInfo.packageName;
-    }
-}
-
-class PendingAddWidgetInfo extends PendingAddItemInfo {
-    int minWidth;
-    int minHeight;
-    int minResizeWidth;
-    int minResizeHeight;
-    int previewImage;
-    int icon;
-    LauncherAppWidgetProviderInfo info;
-    AppWidgetHostView boundWidget;
-    Bundle bindOptions = null;
-
-    public PendingAddWidgetInfo(LauncherAppWidgetProviderInfo i, Parcelable data) {
-        if (i.isCustomWidget) {
-            itemType = LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
-        } else {
-            itemType = LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET;
-        }
-        this.info = i;
-        componentName = i.provider;
-        minWidth = i.minWidth;
-        minHeight = i.minHeight;
-        minResizeWidth = i.minResizeWidth;
-        minResizeHeight = i.minResizeHeight;
-        previewImage = i.previewImage;
-        icon = i.icon;
-
-        spanX = i.spanX;
-        spanY = i.spanY;
-        minSpanX = i.minSpanX;
-        minSpanY = i.minSpanY;
-    }
-
-    public boolean isCustomWidget() {
-        return itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
-    }
-
-    // Copy constructor
-    public PendingAddWidgetInfo(PendingAddWidgetInfo copy) {
-        minWidth = copy.minWidth;
-        minHeight = copy.minHeight;
-        minResizeWidth = copy.minResizeWidth;
-        minResizeHeight = copy.minResizeHeight;
-        previewImage = copy.previewImage;
-        icon = copy.icon;
-        info = copy.info;
-        boundWidget = copy.boundWidget;
-        componentName = copy.componentName;
-        itemType = copy.itemType;
-        spanX = copy.spanX;
-        spanY = copy.spanY;
-        minSpanX = copy.minSpanX;
-        minSpanY = copy.minSpanY;
-        bindOptions = copy.bindOptions == null ? null : (Bundle) copy.bindOptions.clone();
-    }
-
-    @Override
-    public String toString() {
-        return "Widget: " + componentName.toShortString();
-    }
+    public ComponentName componentName;
 }