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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.documentsui.picker;
     18 
     19 import static com.android.documentsui.base.State.ACTION_CREATE;
     20 import static com.android.documentsui.base.State.ACTION_GET_CONTENT;
     21 import static com.android.documentsui.base.State.ACTION_OPEN;
     22 import static com.android.documentsui.base.State.ACTION_OPEN_TREE;
     23 import static com.android.documentsui.base.State.ACTION_PICK_COPY_DESTINATION;
     24 
     25 import android.provider.DocumentsContract.Document;
     26 
     27 import com.android.documentsui.ActivityConfig;
     28 import com.android.documentsui.base.MimeTypes;
     29 import com.android.documentsui.base.State;
     30 
     31 /**
     32  * Provides support for Platform specific specializations of DirectoryFragment.
     33  */
     34 final class Config extends ActivityConfig {
     35 
     36     @Override
     37     public boolean canSelectType(String docMimeType, int docFlags, State state) {
     38         if (!isDocumentEnabled(docMimeType, docFlags, state)) {
     39             return false;
     40         }
     41 
     42         if (MimeTypes.isDirectoryType(docMimeType)) {
     43             return false;
     44         }
     45 
     46         if (state.action == ACTION_OPEN_TREE || state.action == ACTION_PICK_COPY_DESTINATION) {
     47             // In this case nothing *ever* is selectable...the expected user behavior is
     48             // they navigate *into* a folder, then click a confirmation button indicating
     49             // that the current directory is the directory they are picking.
     50             return false;
     51         }
     52 
     53         return true;
     54     }
     55 
     56     @Override
     57     public boolean isDocumentEnabled(String mimeType, int docFlags, State state) {
     58         // Directories are always enabled.
     59         if (MimeTypes.isDirectoryType(mimeType)) {
     60             return true;
     61         }
     62 
     63         switch (state.action) {
     64             case ACTION_CREATE:
     65                 // Read-only files are disabled when creating.
     66                 if ((docFlags & Document.FLAG_SUPPORTS_WRITE) == 0) {
     67                     return false;
     68                 }
     69             case ACTION_OPEN:
     70             case ACTION_GET_CONTENT:
     71                 final boolean isVirtual = (docFlags & Document.FLAG_VIRTUAL_DOCUMENT) != 0;
     72                 if (isVirtual && state.openableOnly) {
     73                     return false;
     74                 }
     75         }
     76 
     77         return MimeTypes.mimeMatches(state.acceptMimes, mimeType);
     78     }
     79 }
     80