Here you can find the source of getFrame(Component parent)
| Parameter | Description |
|---|---|
| parent | a component to find the frame of. |
public static Frame getFrame(Component parent)
//package com.java2s; /**/* www.java 2 s .c o m*/ * Distribution License: * JSword is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License, version 2.1 as published by * the Free Software Foundation. This program is distributed in the hope * that it will be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details. * * The License is available on the internet at: * http://www.gnu.org/copyleft/lgpl.html * or by writing to: * Free Software Foundation, Inc. * 59 Temple Place - Suite 330 * Boston, MA 02111-1307, USA * * Copyright: 2005 * The copyright to this program is held by it's authors. * * ID: $Id: GuiUtil.java 2045 2010-12-06 21:19:49Z dmsmith $ */ import java.awt.Component; import java.awt.Frame; import javax.swing.JOptionPane; public class Main { /** * Find the parent Frame. This method can do more than simply walking up the * tree to find a parent frame by looking for default frames from * JOptionPane and by looking for all visible Frames. We can be sure to * return a Frame from this method even if null is passed in. * * @param parent * a component to find the frame of. * @return The parent Frame */ public static Frame getFrame(Component parent) { if (parent == null) { // So we can't get one by walking up the tree so we will have to // get one from somewhere else. // Firstly someone might have called JOptionPane.setRootFrame() // to give us a reasonable default so try there Frame option = JOptionPane.getRootFrame(); // If a default has not been set, JOptionPane.getRootFrame() calls // SwingUtilities.getSharedOwnerFrame() to get a new invisible frame // and we may be able to do better than that. Unfortunately the // getSharedOwnerFrame() method is not public so we have to trick // our way to finding if we got a duff default if (!option.getClass().getName().startsWith("javax.swing.SwingUtilities$")) { // So we think the JOptionPane root frame is our creation return option; } // We might be able to get a better default by looking through all // the frames and picking the biggest visible one. Frame best = null; int bestSize = 0; Frame[] frames = Frame.getFrames(); for (int i = 0; i < frames.length; i++) { Frame frame = frames[i]; if (frame.isVisible()) { // So this frame is a candidate int thisSize = frame.getWidth() * frame.getHeight(); if (best == null || thisSize > bestSize) { best = frame; bestSize = thisSize; } } } // So if we found a frame from searching then use that if (best != null) { return best; } // if all else fails we will have to use the invisible frame // provided by JOptionPane return option; } if (parent instanceof Frame) { return (Frame) parent; } // So we walk up the tree looking for a frame return getFrame(parent.getParent()); } /** * Find the best frame to which to root a dialog, generally the largest * visible frame of the application. * * @return the best frame. */ public static Frame getRootFrame() { return getFrame(null); } }