Here you can find the source of ensureVisibilityAtParent(final JInternalFrame frame)
public static void ensureVisibilityAtParent(final JInternalFrame frame)
//package com.java2s; /* // ww w . j a v a 2 s. c o m * Copyright 2014 Igor Maznitsa (http://www.igormaznitsa.com). * * 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. */ import java.awt.*; import javax.swing.JComponent; import javax.swing.JInternalFrame; import javax.swing.SwingUtilities; public class Main { public static void ensureVisibilityAtParent(final JInternalFrame frame) { final JComponent parent = (JComponent) frame.getParent(); final Rectangle parentRect = SwingUtilities.calculateInnerArea(parent, null); final Rectangle frameRect = frame.getBounds(); final int x = Math.min(frameRect.x, Math.max(0, parentRect.width - frameRect.width)); final int y = Math.min(frameRect.y, Math.max(0, parentRect.height - frameRect.height)); frame.setLocation(x, y); } }