platform/platform-impl/src/com/intellij/openapi/editor/impl/PersistentRangeMarker.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 PersistentRangeMarker extends RangeMarkerImpl {
  26   private int myStartLine;
  27   private int myStartColumn;
  28   private int myEndLine;
  29   private int myEndColumn;
  30
  31   public PersistentRangeMarker(DocumentEx document, int startOffset, int endOffset) {
  32     super(document, startOffset, endOffset);
  33     storeLinesAndCols();
  34   }
  35
  36   private void storeLinesAndCols() {
  37     // document might have been changed already
  38     if (getStartOffset() < myDocument.getTextLength()) {
  39       myStartLine = myDocument.getLineNumber(getStartOffset());
  40       myStartColumn = getStartOffset() - myDocument.getLineStartOffset(myStartLine);
  41       if (myStartColumn < 0) {
  42         invalidate();
  43       }
  44     }
  45     if (getEndOffset() < myDocument.getTextLength()) {
  46       myEndLine = myDocument.getLineNumber(getEndOffset());
  47       myEndColumn = getEndOffset() - myDocument.getLineStartOffset(myEndLine);
  48       if (myEndColumn < 0) {
  49         invalidate();
  50       }
  51     }
  52   }
  53
  54   @Override
  55   protected void changedUpdateImpl(DocumentEvent e) {
  56     DocumentEventImpl event = (DocumentEventImpl)e;
  57     if (event.isWholeTextReplaced()){
  58       myStartLine = event.translateLineViaDiffStrict(myStartLine);
  59       if (myStartLine < 0 || myStartLine >= getDocument().getLineCount()){
  60         invalidate();
  61       }
  62       else{
  63         myStart = getDocument().getLineStartOffset(myStartLine) + myStartColumn;
  64       }
  65
  66       myEndLine = event.translateLineViaDiffStrict(myEndLine);
  67       if (myEndLine < 0 || myEndLine >= getDocument().getLineCount()){
  68         invalidate();
  69       }
  70       else{
  71         myEnd = getDocument().getLineStartOffset(myEndLine) + myEndColumn;
  72       }
  73     }
  74     else {
  75       super.changedUpdateImpl(e);
  76       if (isValid()){
  77         storeLinesAndCols();
  78       }
  79     }
  80     if (myEnd < myStart || myEnd > getDocument().getTextLength()) {
  81       invalidate();
  82     }
  83   }
  84 }