When dragging items on the home screen, visualize where they will drop.

Draw a rectangle around the area where an item will land if it is dropped.
If the area is vacant, the rectangle is green; otherwise, it is red.

Change-Id: I859b52514566fa55f8c7a04493b8088d12baa476

1 files changed, 25 insertions, 3 deletions

diff --git a/src/com/android/launcher2/LauncherAppWidgetInfo.java b/src/com/android/launcher2/LauncherAppWidgetInfo.java
index 3c81bac8e..32c92aabd 100644
--- a/src/com/android/launcher2/LauncherAppWidgetInfo.java
+++ b/src/com/android/launcher2/LauncherAppWidgetInfo.java
@@ -21,23 +21,46 @@ import android.content.ComponentName;
 import android.content.ContentValues;
 
 /**
- * Represents a widget, which just contains an identifier.
+ * Represents a widget (either instantiated or about to be) in the Launcher.
  */
 class LauncherAppWidgetInfo extends ItemInfo {
 
     /**
+     * Indicates that the widget hasn't been instantiated yet.
+     */
+    static final int NO_ID = -1;
+
+    /**
      * Identifier for this widget when talking with
      * {@link android.appwidget.AppWidgetManager} for updates.
      */
-    int appWidgetId;
+    int appWidgetId = NO_ID;
+
     ComponentName providerName;
     
+    // TODO: Are these necessary here?
+    int minWidth = -1;
+    int minHeight = -1;
+
     /**
      * View that holds this widget after it's been created.  This view isn't created
      * until Launcher knows it's needed.
      */
     AppWidgetHostView hostView = null;
 
+    /**
+     * Constructor for use with AppWidgets that haven't been instantiated yet.
+     */
+    LauncherAppWidgetInfo(ComponentName providerName) {
+        itemType = LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET;
+        this.providerName = providerName;
+
+        // Since the widget isn't instantiated yet, we don't know these values. Set them to -1
+        // to indicate that they should be calculated based on the layout and minWidth/minHeight
+        spanX = -1;
+        spanY = -1;
+    }
+
     LauncherAppWidgetInfo(int appWidgetId) {
         itemType = LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET;
         this.appWidgetId = appWidgetId;
@@ -54,7 +77,6 @@ class LauncherAppWidgetInfo extends ItemInfo {
         return "AppWidget(id=" + Integer.toString(appWidgetId) + ")";
     }
 
-
     @Override
     void unbind() {
         super.unbind();