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package com.jetbrains.python.edu;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.LogicalPosition;
import com.intellij.openapi.editor.event.DocumentAdapter;
import com.intellij.openapi.editor.event.DocumentEvent;
import com.intellij.openapi.editor.impl.event.DocumentEventImpl;
import com.jetbrains.python.edu.course.TaskFile;
import com.jetbrains.python.edu.course.TaskWindow;
/**
* author: liana
* data: 7/16/14.
* Listens changes in study files and updates
* coordinates of all the windows in current task file
*/
public class StudyDocumentListener extends DocumentAdapter {
private final TaskFile myTaskFile;
private int oldLine;
private int oldLineStartOffset;
private TaskWindow myTaskWindow;
public StudyDocumentListener(TaskFile taskFile) {
myTaskFile = taskFile;
}
//remembering old end before document change because of problems
// with fragments containing "\n"
@Override
public void beforeDocumentChange(DocumentEvent e) {
int offset = e.getOffset();
int oldEnd = offset + e.getOldLength();
Document document = e.getDocument();
oldLine = document.getLineNumber(oldEnd);
oldLineStartOffset = document.getLineStartOffset(oldLine);
int line = document.getLineNumber(offset);
int offsetInLine = offset - document.getLineStartOffset(line);
LogicalPosition pos = new LogicalPosition(line, offsetInLine);
myTaskWindow = myTaskFile.getTaskWindow(document, pos);
}
@Override
public void documentChanged(DocumentEvent e) {
if (e instanceof DocumentEventImpl) {
DocumentEventImpl event = (DocumentEventImpl)e;
Document document = e.getDocument();
int offset = e.getOffset();
int change = event.getNewLength() - event.getOldLength();
if (myTaskWindow != null) {
int newLength = myTaskWindow.getLength() + change;
myTaskWindow.setLength(newLength <= 0 ? 0 : newLength);
}
int newEnd = offset + event.getNewLength();
int newLine = document.getLineNumber(newEnd);
int lineChange = newLine - oldLine;
myTaskFile.incrementLines(oldLine + 1, lineChange);
int newEndOffsetInLine = offset + e.getNewLength() - document.getLineStartOffset(newLine);
int oldEndOffsetInLine = offset + e.getOldLength() - oldLineStartOffset;
myTaskFile.updateLine(lineChange, oldLine, newEndOffsetInLine, oldEndOffsetInLine);
}
}
}
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