content: /*
   * Copyright (C) 2015-2023 Emanuel Moecklin
   *
   * 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.onegravity.rteditor.spans;
  
  /**
   * Paragraph indentation.
   * <p>
   * Android seems to add the leading margin for an empty paragraph to the previous paragraph
   * (]0, 4][4, 4] --> the leading margin of the second span is added to the ]0, 4] paragraph regardless of the Spanned.flags)
   * --> therefore we ignore the leading margin for the last, empty paragraph unless it's the only one
   */
  public class IndentationSpan extends android.text.style.LeadingMarginSpan.Standard implements RTSpan<Integer>, RTParagraphSpan<Integer> {
  
      private final int mIndentation;
      private final boolean mIgnoreSpan;
  
      public IndentationSpan(int indentation, boolean isEmpty, boolean isFirst, boolean isLast) {
          super(indentation);
          mIndentation = indentation;
          mIgnoreSpan = isEmpty && isLast && !isFirst;
      }
  
      private IndentationSpan(int indentation, boolean ignoreSpan) {
          super(indentation);
          mIndentation = indentation;
          mIgnoreSpan = ignoreSpan;
      }
  
      @Override
      public int getLeadingMargin(boolean first) {
          return mIgnoreSpan ? 0 : mIndentation;
      }
  
      /**
       * While the getLeadingMargin(boolean) is "officially" used when rendering the span
       * this method returns the indentation regardless of whether we want to render it or not.
       * Internally we always use this method.
       */
      @Override
      public Integer getValue() {
          return mIndentation;
      }
  
      @Override
      public IndentationSpan createClone() {
          return new IndentationSpan(mIndentation, mIgnoreSpan);
      }
  
  }
  