TextHelpers.java

/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

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.google.security.zynamics.zylib.gui.textfields;

import javax.swing.text.Element;
import javax.swing.text.JTextComponent;

public class TextHelpers {
  public static int getLineAtCaret(final JTextComponent component) {
    final int caretPosition = component.getCaretPosition();
    final Element root = component.getDocument().getDefaultRootElement();

    return root.getElementIndex(caretPosition) + 1;
  }

  public static int getNumberOfLines(final JTextComponent component) {
    final Element root = component.getDocument().getDefaultRootElement();

    return root.getElementCount();
  }

  public static void insert(final JTextComponent component, final int position, final String string) {
    final String old = component.getText();

    component.setText(old.substring(0, position) + string + old.substring(position));
  }

  public static void insert(final JTextComponent component, final String string) {
    final int start = component.getSelectionStart();

    insert(component, start, string);

    component.setSelectionStart(start + string.length());
    component.setSelectionEnd(start + string.length());
  }
}