1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.awt; 27 28 import java.awt.*; 29 30 import sun.util.logging.PlatformLogger; 31 32 public abstract class SunGraphicsCallback { 33 public static final int HEAVYWEIGHTS = 0x1; 34 public static final int LIGHTWEIGHTS = 0x2; 35 public static final int TWO_PASSES = 0x4; 36 37 private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.SunGraphicsCallback"); 38 run(Component comp, Graphics cg)39 public abstract void run(Component comp, Graphics cg); 40 constrainGraphics(Graphics g, Rectangle bounds)41 protected void constrainGraphics(Graphics g, Rectangle bounds) { 42 if (g instanceof ConstrainableGraphics) { 43 ((ConstrainableGraphics)g).constrain(bounds.x, bounds.y, bounds.width, bounds.height); 44 } else { 45 g.translate(bounds.x, bounds.y); 46 } 47 g.clipRect(0, 0, bounds.width, bounds.height); 48 } 49 runOneComponent(Component comp, Rectangle bounds, Graphics g, Shape clip, int weightFlags)50 public final void runOneComponent(Component comp, Rectangle bounds, 51 Graphics g, Shape clip, 52 int weightFlags) { 53 if (comp == null || !comp.isDisplayable() || !comp.isVisible()) { 54 return; 55 } 56 boolean lightweight = comp.isLightweight(); 57 if ((lightweight && (weightFlags & LIGHTWEIGHTS) == 0) || 58 (!lightweight && (weightFlags & HEAVYWEIGHTS) == 0)) { 59 return; 60 } 61 62 if (bounds == null) { 63 bounds = comp.getBounds(); 64 } 65 66 if (clip == null || clip.intersects(bounds)) { 67 Graphics cg = g.create(); 68 try { 69 constrainGraphics(cg, bounds); 70 cg.setFont(comp.getFont()); 71 cg.setColor(comp.getForeground()); 72 if (cg instanceof Graphics2D) { 73 ((Graphics2D)cg).setBackground(comp.getBackground()); 74 } 75 run(comp, cg); 76 } finally { 77 cg.dispose(); 78 } 79 } 80 } 81 runComponents(Component[] comps, Graphics g, int weightFlags)82 public final void runComponents(Component[] comps, Graphics g, 83 int weightFlags) { 84 int ncomponents = comps.length; 85 Shape clip = g.getClip(); 86 87 if (log.isLoggable(PlatformLogger.Level.FINER) && (clip != null)) { 88 Rectangle newrect = clip.getBounds(); 89 log.finer("x = " + newrect.x + ", y = " + newrect.y + 90 ", width = " + newrect.width + 91 ", height = " + newrect.height); 92 } 93 94 // A seriously sad hack-- 95 // Lightweight components always paint behind peered components, 96 // even if they are at the top of the Z order. We emulate this 97 // behavior by making two printing passes: the first for lightweights; 98 // the second for heavyweights. 99 // 100 // ToDo(dpm): Either build a list of heavyweights during the 101 // lightweight pass, or redesign the components array to keep 102 // lightweights and heavyweights separate. 103 if ((weightFlags & TWO_PASSES) != 0) { 104 for (int i = ncomponents - 1; i >= 0; i--) { 105 runOneComponent(comps[i], null, g, clip, LIGHTWEIGHTS); 106 } 107 for (int i = ncomponents - 1; i >= 0; i--) { 108 runOneComponent(comps[i], null, g, clip, HEAVYWEIGHTS); 109 } 110 } else { 111 for (int i = ncomponents - 1; i >= 0; i--) { 112 runOneComponent(comps[i], null, g, clip, weightFlags); 113 } 114 } 115 } 116 117 public static final class PaintHeavyweightComponentsCallback 118 extends SunGraphicsCallback 119 { 120 private static PaintHeavyweightComponentsCallback instance = 121 new PaintHeavyweightComponentsCallback(); 122 PaintHeavyweightComponentsCallback()123 private PaintHeavyweightComponentsCallback() {} run(Component comp, Graphics cg)124 public void run(Component comp, Graphics cg) { 125 if (!comp.isLightweight()) { 126 comp.paintAll(cg); 127 } else if (comp instanceof Container) { 128 runComponents(((Container)comp).getComponents(), cg, 129 LIGHTWEIGHTS | HEAVYWEIGHTS); 130 } 131 } getInstance()132 public static PaintHeavyweightComponentsCallback getInstance() { 133 return instance; 134 } 135 } 136 public static final class PrintHeavyweightComponentsCallback 137 extends SunGraphicsCallback 138 { 139 private static PrintHeavyweightComponentsCallback instance = 140 new PrintHeavyweightComponentsCallback(); 141 PrintHeavyweightComponentsCallback()142 private PrintHeavyweightComponentsCallback() {} run(Component comp, Graphics cg)143 public void run(Component comp, Graphics cg) { 144 if (!comp.isLightweight()) { 145 comp.printAll(cg); 146 } else if (comp instanceof Container) { 147 runComponents(((Container)comp).getComponents(), cg, 148 LIGHTWEIGHTS | HEAVYWEIGHTS); 149 } 150 } getInstance()151 public static PrintHeavyweightComponentsCallback getInstance() { 152 return instance; 153 } 154 } 155 } 156