[File Manager]Disable "Copy" command if selection contains dimmed GData files

chrome/browser/resources/file_manager/js/file_manager.js

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index 256ad2de5cfeab1bbb05e04dc6d7c0a017dc716c..1163e927b85186faa4db0e26694600822cb2184c 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -2215,6 +2215,7 @@ FileManager.prototype = {
       directoryCount: 0,
       bytes: 0,
       showBytes: false,
+      allGDataFilesPresent: this.isOnGData(),
       iconType: null,
       indexes: this.currentList_.selectionModel.selectedIndexes
     };
@@ -2232,6 +2233,7 @@ FileManager.prototype = {
     var fileCount = 0;
     var byteCount = 0;
     var pendingFiles = [];
+    var pendingGDataFiles = [];
     var thumbnailCount = 0;
     var thumbnailLoaded = -1;
     var forcedShowTimeout = null;
@@ -2305,8 +2307,21 @@ FileManager.prototype = {
           selection.bytes += entry.cachedSize_;
           selection.showBytes |= this.getFileType(entry).type != 'hosted';
         }
+
+        // Only keep checking if allGDataFilesPresent is not already false.
+        if (selection.allGDataFilesPresent) {
+          if (!('gdata_' in entry)) {
+            pendingGDataFiles.push(entry);
+          } else {
+            selection.allGDataFilesPresent =
+                FileManager.isAvaliableOffline_(entry.gdata_);
+          }
+        }
       } else {
         selection.directoryCount += 1;
+        // We cannot afford checking every file under this directory so
+        // we conservatively assume that some files are not present.
+        selection.allGDataFilesPresent = false;
       }
     }
 
@@ -2316,6 +2331,15 @@ FileManager.prototype = {
     forcedShowTimeout = setTimeout(showThumbnails, 100);
     onThumbnailLoaded();
 
+    if (this.fileTransferController_) {
+      this.fileTransferController_.selectionAvailable = false;
+    }
+
+    function maybeFireSummarized() {
+      if (pendingFiles.length == 0 && pendingGDataFiles.length == 0)
+        self.dispatchEvent(new cr.Event('selection-summarized'));
+    }
+
     function cacheNextFile(fileEntry) {
       if (fileEntry) {
         // We're careful to modify the 'selection', rather than 'self.selection'
@@ -2328,7 +2352,21 @@ FileManager.prototype = {
       if (pendingFiles.length) {
         cacheEntryDateAndSize(pendingFiles.pop(), cacheNextFile);
       } else {
-        self.dispatchEvent(new cr.Event('selection-summarized'));
+        maybeFireSummarized();
+      }
+    }
+
+    function cacheNextGDataFile(fileEntry) {
+      // If selection.allGDataFilesPresent is already false we stop checking.
+      if (selection.allGDataFilesPresent && fileEntry) {
+         selection.allGDataFilesPresent =
+             FileManager.isAvaliableOffline_(fileEntry.gdata_);
+      }
+      if (selection.allGDataFilesPresent && pendingGDataFiles.length) {
+        cacheGDataProps(pendingGDataFiles.pop(), cacheNextGDataFile);
+      } else {
+        pendingGDataFiles = [];
+        maybeFireSummarized();
       }
     }
 
@@ -2347,6 +2385,8 @@ FileManager.prototype = {
     }
 
     cacheNextFile();
+    if (selection.allGDataFilesPresent)
+      cacheNextGDataFile();
   };
 
   /**
@@ -2695,6 +2735,16 @@ FileManager.prototype = {
     return this.isOnGData() && this.isOffline();
   };
 
+  /**
+   * Check if all the files in the current selection are available. The only
+   * case when files might be not available is when the selection contains
+   * uncached GData files and the browser is offline.
+   * @return {boolean} True if all files in the current selection are available.
+   */
+  FileManager.prototype.isSelectionAvailable = function() {
+    return !this.isOnGDataOffline() || this.selection.allGDataFilesPresent;
+  };
+
   FileManager.prototype.isOnReadonlyDirectory = function() {
     return this.directoryModel_.readonly;
   };
@@ -3233,6 +3283,12 @@ FileManager.prototype = {
       if (!selection.showBytes) text = text.substring(0, text.lastIndexOf(','));
     }
     this.previewSummary_.textContent = text;
+
+    this.updateOkButton_();
+    if (this.fileTransferController_) {
+      this.fileTransferController_.selectionAvailable =
+          this.isSelectionAvailable();
+    }
   };
 
   /**
@@ -3378,11 +3434,13 @@ FileManager.prototype = {
       selectable = this.selection.directoryCount == 1 &&
           this.selection.fileCount == 0;
     } else if (this.dialogType_ == FileManager.DialogType.SELECT_OPEN_FILE) {
-      selectable = (this.selection.directoryCount == 0 &&
+      selectable = (this.isSelectionAvailable() &&
+                    this.selection.directoryCount == 0 &&
                     this.selection.fileCount == 1);
     } else if (this.dialogType_ ==
                FileManager.DialogType.SELECT_OPEN_MULTI_FILE) {
-      selectable = (this.selection.directoryCount == 0 &&
+      selectable = (this.isSelectionAvailable() &&
+                    this.selection.directoryCount == 0 &&
                     this.selection.fileCount >= 1);
     } else if (this.dialogType_ == FileManager.DialogType.SELECT_SAVEAS_FILE) {
       if (this.isOnReadonlyDirectory()) {