1 /* 2 * Copyright (C) 2017 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 package com.android.documentsui.inspector; 17 18 import static androidx.core.util.Preconditions.checkArgument; 19 20 import android.text.Spannable; 21 import android.view.ActionMode; 22 import android.view.Menu; 23 import android.view.MenuItem; 24 import android.widget.TextView; 25 26 /** 27 * Selects all or part of a textview. 28 */ 29 public final class HeaderTextSelector implements ActionMode.Callback { 30 31 private final TextView mText; 32 private final Selector mSelector; 33 HeaderTextSelector(TextView text, Selector selector)34 public HeaderTextSelector(TextView text, Selector selector) { 35 checkArgument(text != null); 36 checkArgument(selector != null); 37 mText = text; 38 mSelector = selector; 39 } 40 41 // An action mode is created when the user selects text. This method is called where 42 // we force it to select only the filename in the header. Meaning the name of the file would 43 // be selected but the extension would not. 44 @Override onCreateActionMode(ActionMode actionMode, Menu menu)45 public boolean onCreateActionMode(ActionMode actionMode, Menu menu) { 46 CharSequence value = mText.getText(); 47 if (value instanceof Spannable) { 48 mSelector.select((Spannable) value, 0, getLengthOfFilename(value)); 49 } 50 return true; 51 } 52 53 @Override onPrepareActionMode(ActionMode actionMode, Menu menu)54 public boolean onPrepareActionMode(ActionMode actionMode, Menu menu) { 55 return true; 56 } 57 58 @Override onActionItemClicked(ActionMode actionMode, MenuItem menuItem)59 public boolean onActionItemClicked(ActionMode actionMode, MenuItem menuItem) { 60 return false; 61 } 62 63 @Override onDestroyActionMode(ActionMode actionMode)64 public void onDestroyActionMode(ActionMode actionMode) {} 65 66 /** 67 * Gets the length of the inspector header for selection. 68 * 69 * Example: 70 * filename.txt returns the end index needed to select "filename". 71 * 72 * @return the index of the last character in the filename 73 */ getLengthOfFilename(CharSequence text)74 private static int getLengthOfFilename(CharSequence text) { 75 String title = text.toString(); 76 if (title != null) { 77 int index = title.indexOf('.'); 78 if (index > 0) { 79 return index; 80 } 81 } 82 83 return text.length(); 84 } 85 86 public interface Selector { select(Spannable text, int start, int stop)87 void select(Spannable text, int start, int stop); 88 } 89 } 90