openide/source/com/intellij/openapi/editor/actions/EnterAction.java

/*
 * Created by IntelliJ IDEA.
 * User: max
 * Date: May 13, 2002
 * Time: 9:35:30 PM
 * To change template for new class use
 * Code Style | Class Templates options (Tools | IDE Options).
 */
package com.intellij.openapi.editor.actions;

import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.command.CommandProcessor;
import com.intellij.openapi.editor.*;
import com.intellij.openapi.editor.actionSystem.EditorAction;
import com.intellij.openapi.editor.actionSystem.EditorWriteActionHandler;

public class EnterAction extends EditorAction {
  public EnterAction() {
    super(new Handler());
  }

  private static class Handler extends EditorWriteActionHandler {
    public void executeWriteAction(Editor editor, DataContext dataContext) {
      CommandProcessor.getInstance().setCurrentCommandName("Typing");
      insertNewLineAtCaret(editor);
    }

    public boolean isEnabled(Editor editor, DataContext dataContext) {
      return !editor.isOneLineMode();
    }
  }

  private static void insertNewLineAtCaret(Editor editor) {
    if(!editor.isInsertMode()) {
      if(editor.getCaretModel().getLogicalPosition().line < editor.getDocument().getLineCount()-1) {
        LogicalPosition pos = new LogicalPosition(editor.getCaretModel().getLogicalPosition().line+1, 0);
        editor.getCaretModel().moveToLogicalPosition(pos);
        editor.getSelectionModel().removeSelection();
        editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
      }
      return;
    }
    EditorModificationUtil.deleteSelectedText(editor);
    // Smart indenting here:
    Document document = editor.getDocument();
    CharSequence text = document.getCharsSequence();

    int indentLineNum = editor.getCaretModel().getLogicalPosition().line;
    int lineLength = 0;
    if (document.getLineCount() > 0) {
      for(;indentLineNum >= 0; indentLineNum--) {
        lineLength = document.getLineEndOffset(indentLineNum) - document.getLineStartOffset(indentLineNum);
        if(lineLength > 0)
          break;
      }
    } else {
      indentLineNum = -1;
    }

    int colNumber = editor.getCaretModel().getLogicalPosition().column;
    StringBuffer buf = new StringBuffer();
    if(indentLineNum >= 0) {
      int lineStartOffset = document.getLineStartOffset(indentLineNum);
      for(int i = 0; i < lineLength; i++) {
        char c = text.charAt(lineStartOffset + i);
        if(c != ' ' && c != '\t') {
          break;
        }
        if(i >= colNumber) {
          break;
        }
        buf.append(c);
      }
    }
    int caretOffset = editor.getCaretModel().getOffset();
    String s = "\n"+buf;
    document.insertString(caretOffset, s);
    editor.getCaretModel().moveToOffset(caretOffset + s.length());
    editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
    editor.getSelectionModel().removeSelection();
  }
}
class InStaticInitializer {
public static final String x = "Hello World";

  static {
    System.out.println(x);
  }
    //Field must be placed before initializer or illegal forward reference will happen
}