content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.internal.widget;
  
  import android.annotation.UnsupportedAppUsage;
  import android.text.InputFilter;
  import android.text.Spanned;
  import android.widget.TextView;
  
  /**
   * Helper class to disable input on a TextView. The input is disabled by swapping in an InputFilter
   * that discards all changes. Use with care if you have customized InputFilter on the target
   * TextView.
   */
  public class TextViewInputDisabler {
      private TextView mTextView;
      private InputFilter[] mDefaultFilters;
      private InputFilter[] mNoInputFilters = new InputFilter[] {
              new InputFilter () {
                  @Override
                  public CharSequence filter(CharSequence source, int start, int end, Spanned dest,
                          int dstart, int dend) {
                      return "";
                  }
              }
      };
  
      @UnsupportedAppUsage
      public TextViewInputDisabler(TextView textView) {
          mTextView = textView;
          mDefaultFilters = mTextView.getFilters();
      }
  
      @UnsupportedAppUsage
      public void setInputEnabled(boolean enabled) {
          mTextView.setFilters(enabled ? mDefaultFilters : mNoInputFilters);
      }
  }
  