platform/platform-impl/src/com/intellij/openapi/editor/impl/PersistentLineMarker.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   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.intellij.openapi.editor.impl;
  17
  18 import com.intellij.openapi.editor.event.DocumentEvent;
  19 import com.intellij.openapi.editor.ex.DocumentEx;
  20 import com.intellij.openapi.editor.impl.event.DocumentEventImpl;
  21
  22 /**
  23  * @author max
  24  */
  25 public class PersistentLineMarker extends RangeMarkerImpl {
  26   private int myLine;
  27   public PersistentLineMarker(DocumentEx document, int offset) {
  28     super(document, offset, offset);
  29     myLine = document.getLineNumber(offset);
  30   }
  31
  32   @Override
  33   protected void changedUpdateImpl(DocumentEvent e) {
  34     DocumentEventImpl event = (DocumentEventImpl)e;
  35     if (event.isWholeTextReplaced()) {
  36       myLine = event.translateLineViaDiff(myLine);
  37       if (myLine < 0 || myLine >= getDocument().getLineCount()) {
  38         invalidate();
  39       }
  40       else {
  41         myStart = MarkupModelImpl.getFirstNonspaceCharOffset(getDocument(), myLine);
  42         myEnd = myStart;
  43       }
  44     }
  45     else {
  46       super.changedUpdateImpl(e);
  47       if (isValid()) {
  48         myLine = getDocument().getLineNumber(myStart);
  49       }
  50     }
  51   }
  52 }