/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.intellij.openapi.editor.actions;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.actionSystem.IdeActions;
import com.intellij.openapi.editor.Caret;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.SelectionModel;
import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
import com.intellij.openapi.editor.actionSystem.EditorActionManager;
import com.intellij.openapi.editor.actionSystem.EditorWriteActionHandler;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
/**
* Works like a usual backspace except the situation when the caret is located after white space - all white space symbols
* (white spaces, tabulations, line feeds) are removed then.
*
* @author Denis Zhdanov
* @since 6/27/12 4:10 PM
*/
public class HungryBackspaceAction extends TextComponentEditorAction {
public HungryBackspaceAction() {
super(new Handler());
}
private static class Handler extends EditorWriteActionHandler {
public Handler() {
super(true);
}
@Override
public void executeWriteAction(@NotNull Editor editor, Caret caret, DataContext dataContext) {
final Document document = editor.getDocument();
final int caretOffset = editor.getCaretModel().getOffset();
if (caretOffset < 1) {
return;
}
final SelectionModel selectionModel = editor.getSelectionModel();
final CharSequence text = document.getCharsSequence();
final char c = text.charAt(caretOffset - 1);
if (!selectionModel.hasSelection() && StringUtil.isWhiteSpace(c)) {
int startOffset = CharArrayUtil.shiftBackward(text, caretOffset - 2, "\t \n") + 1;
document.deleteString(startOffset, caretOffset);
}
else {
final EditorActionHandler handler = EditorActionManager.getInstance().getActionHandler(IdeActions.ACTION_EDITOR_BACKSPACE);
handler.execute(editor, caret, dataContext);
}
}
}
}