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1: /* DefaultFocusTraversalPolicy.java -- 2: Copyright (C) 2002, 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package java.awt; 40: 41: /** 42: * DefaultFocusTraversalPolicy is the default focus traversal policy 43: * used by Containers. 44: * 45: * This policy sharpens ContainerOrderFocusTraversalPolicy's 46: * acceptance criteria, to reject those Components that have 47: * unfocusable peers. Despite this extra strictness, this policy will 48: * always accept a Component that has explicitly been set focusable by 49: * any means. 50: * 51: * This AWT implementation assumes that the peers of the following 52: * Components are not focusable: Canvas, Panel, Label, ScrollPane, 53: * Scrollbar, Window, and any lightweight Component. 54: * 55: * A Component's focusability is independent of the focusability of 56: * its peer. 57: * 58: * @author Thomas Fitzsimmons (fitzsim@redhat.com) 59: * @since 1.4 60: */ 61: public class DefaultFocusTraversalPolicy 62: extends ContainerOrderFocusTraversalPolicy 63: { 64: /** 65: * Construct a default focus traversal policy. 66: */ 67: public DefaultFocusTraversalPolicy () 68: { 69: } 70: 71: /** 72: * Check whether a given Component would be acceptable as a focus 73: * owner. The Component must be displayable, visible and enabled to 74: * be acceptable. If the Component's focus traversability has been 75: * overridden, by overriding Component.isFocusTraversable or 76: * Component.isFocusable, or by calling Component.setFocusable, then 77: * the Component will be accepted if it is focusable. If the 78: * Component uses the default focus traversable behaviour, then 79: * <code>comp</code> will always be rejected if it is a Canvas, 80: * Panel, Label, ScrollPane, Scrollbar, Window or lightweight 81: * Component. 82: * 83: * @param comp the Component to check 84: * 85: * @return true if the Component is an acceptable target for 86: * keyboard input focus, false otherwise 87: */ 88: protected boolean accept (Component comp) 89: { 90: if (comp.visible 91: && comp.isDisplayable () 92: && comp.enabled) 93: { 94: if (comp.isFocusTraversableOverridden != 0 95: && (comp.isFocusTraversable () || comp.isFocusable())) 96: return true; 97: 98: if (!(comp instanceof Canvas 99: || comp instanceof Panel 100: || comp instanceof Label 101: || comp instanceof ScrollPane 102: || comp instanceof Scrollbar 103: || comp instanceof Window 104: || comp.isLightweight ())) 105: return true; 106: } 107: return false; 108: } 109: }
GNU Classpath (0.20) |