Fix bug where folder items preview remain in low res state.

- We update the ranks of all folder items after loading, to ensure there are
  no gaps caused by removed folder items. This also ensures that we load
  the high resolution icons for all preview items.
- FolderIconPreviewVerifier#setFolderInfo was not always called
- Init mGridSize with [1, 1] to prevent divide by zero error in case
  setFolderInfo is not called

Bug: 126268196
Change-Id: I856489968665a39303e2922c78cf90f2b3ee6ebb

src/com/android/launcher3/folder/FolderIconPreviewVerifier.java

@@ -16,6 +16,8 @@
 
 package com.android.launcher3.folder;
 
+import android.util.Log;
+
 import com.android.launcher3.FolderInfo;
 import com.android.launcher3.InvariantDeviceProfile;
 
@@ -26,14 +28,20 @@ import static com.android.launcher3.folder.ClippedFolderIconLayoutRule.MAX_NUM_I
  */
 public class FolderIconPreviewVerifier {
 
+    private static final String TAG = "FolderPreviewVerifier";
+
     private final int mMaxGridCountX;
     private final int mMaxGridCountY;
     private final int mMaxItemsPerPage;
-    private final int[] mGridSize = new int[2];
+    private final int[] mGridSize = new int[] { 1, 1 };
 
+    private int mNumItemsInFolder;
     private int mGridCountX;
     private boolean mDisplayingUpperLeftQuadrant = false;
 
+    /**
+     * Note: must call {@link #setFolderInfo(FolderInfo)} manually for verifier to work.
+     */
     public FolderIconPreviewVerifier(InvariantDeviceProfile profile) {
         mMaxGridCountX = profile.numFolderColumns;
         mMaxGridCountY = profile.numFolderRows;
@@ -42,11 +50,14 @@ public class FolderIconPreviewVerifier {
 
     public void setFolderInfo(FolderInfo info) {
         int numItemsInFolder = info.contents.size();
-        FolderPagedView.calculateGridSize(numItemsInFolder, 0, 0, mMaxGridCountX,
-                mMaxGridCountY, mMaxItemsPerPage, mGridSize);
-        mGridCountX = mGridSize[0];
+        if (numItemsInFolder != mNumItemsInFolder) {
+            FolderPagedView.calculateGridSize(numItemsInFolder, 0, 0, mMaxGridCountX,
+                    mMaxGridCountY, mMaxItemsPerPage, mGridSize);
+            mGridCountX = mGridSize[0];
 
-        mDisplayingUpperLeftQuadrant = numItemsInFolder > MAX_NUM_ITEMS_IN_PREVIEW;
+            mDisplayingUpperLeftQuadrant = numItemsInFolder > MAX_NUM_ITEMS_IN_PREVIEW;
+            mNumItemsInFolder = numItemsInFolder;
+        }
     }
 
     /**
@@ -62,6 +73,10 @@ public class FolderIconPreviewVerifier {
      * @return True iff the icon is in the 2x2 upper left quadrant of the Folder.
      */
     public boolean isItemInPreview(int page, int rank) {
+        if (mGridSize[0] == 1) {
+            Log.w(TAG, "setFolderInfo not called before checking if item is in preview.");
+        }
+
         // First page items are laid out such that the first 4 items are always in the upper
         // left quadrant. For all other pages, we need to check the row and col.
         if (page > 0 || mDisplayingUpperLeftQuadrant) {