jdk/src/java.desktop/share/classes/sun/awt/SunGraphicsCallback.java
changeset 25859 3317bb8137f4
parent 23010 6dadb192ad81
child 30469 bac0a7ff7e1e
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.desktop/share/classes/sun/awt/SunGraphicsCallback.java	Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.awt;
+
+import java.awt.*;
+
+import sun.util.logging.PlatformLogger;
+
+public abstract class SunGraphicsCallback {
+    public static final int HEAVYWEIGHTS = 0x1;
+    public static final int LIGHTWEIGHTS = 0x2;
+    public static final int TWO_PASSES = 0x4;
+
+    private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.SunGraphicsCallback");
+
+    public abstract void run(Component comp, Graphics cg);
+
+    protected void constrainGraphics(Graphics g, Rectangle bounds) {
+        if (g instanceof ConstrainableGraphics) {
+            ((ConstrainableGraphics)g).constrain(bounds.x, bounds.y, bounds.width, bounds.height);
+        } else {
+            g.translate(bounds.x, bounds.y);
+        }
+        g.clipRect(0, 0, bounds.width, bounds.height);
+    }
+
+    @SuppressWarnings("deprecation")
+    public final void runOneComponent(Component comp, Rectangle bounds,
+                                      Graphics g, Shape clip,
+                                      int weightFlags) {
+        if (comp == null || comp.getPeer() == null || !comp.isVisible()) {
+            return;
+        }
+        boolean lightweight = comp.isLightweight();
+        if ((lightweight && (weightFlags & LIGHTWEIGHTS) == 0) ||
+            (!lightweight && (weightFlags & HEAVYWEIGHTS) == 0)) {
+            return;
+        }
+
+        if (bounds == null) {
+            bounds = comp.getBounds();
+        }
+
+        if (clip == null || clip.intersects(bounds)) {
+            Graphics cg = g.create();
+            try {
+                constrainGraphics(cg, bounds);
+                cg.setFont(comp.getFont());
+                cg.setColor(comp.getForeground());
+                if (cg instanceof Graphics2D) {
+                    ((Graphics2D)cg).setBackground(comp.getBackground());
+                } else if (cg instanceof Graphics2Delegate) {
+                    ((Graphics2Delegate)cg).setBackground(
+                        comp.getBackground());
+                }
+                run(comp, cg);
+            } finally {
+                cg.dispose();
+            }
+        }
+    }
+
+    public final void runComponents(Component[] comps, Graphics g,
+                                    int weightFlags) {
+        int ncomponents = comps.length;
+        Shape clip = g.getClip();
+
+        if (log.isLoggable(PlatformLogger.Level.FINER) && (clip != null)) {
+            Rectangle newrect = clip.getBounds();
+            log.finer("x = " + newrect.x + ", y = " + newrect.y +
+                      ", width = " + newrect.width +
+                      ", height = " + newrect.height);
+        }
+
+        // A seriously sad hack--
+        // Lightweight components always paint behind peered components,
+        // even if they are at the top of the Z order. We emulate this
+        // behavior by making two printing passes: the first for lightweights;
+        // the second for heavyweights.
+        //
+        // ToDo(dpm): Either build a list of heavyweights during the
+        // lightweight pass, or redesign the components array to keep
+        // lightweights and heavyweights separate.
+        if ((weightFlags & TWO_PASSES) != 0) {
+            for (int i = ncomponents - 1; i >= 0; i--) {
+                runOneComponent(comps[i], null, g, clip, LIGHTWEIGHTS);
+            }
+            for (int i = ncomponents - 1; i >= 0; i--) {
+                runOneComponent(comps[i], null, g, clip, HEAVYWEIGHTS);
+            }
+        } else {
+            for (int i = ncomponents - 1; i >= 0; i--) {
+                runOneComponent(comps[i], null, g, clip, weightFlags);
+            }
+        }
+    }
+
+    public static final class PaintHeavyweightComponentsCallback
+        extends SunGraphicsCallback
+    {
+        private static PaintHeavyweightComponentsCallback instance =
+            new PaintHeavyweightComponentsCallback();
+
+        private PaintHeavyweightComponentsCallback() {}
+        public void run(Component comp, Graphics cg) {
+            if (!comp.isLightweight()) {
+                comp.paintAll(cg);
+            } else if (comp instanceof Container) {
+                runComponents(((Container)comp).getComponents(), cg,
+                              LIGHTWEIGHTS | HEAVYWEIGHTS);
+            }
+        }
+        public static PaintHeavyweightComponentsCallback getInstance() {
+            return instance;
+        }
+    }
+    public static final class PrintHeavyweightComponentsCallback
+        extends SunGraphicsCallback
+    {
+        private static PrintHeavyweightComponentsCallback instance =
+            new PrintHeavyweightComponentsCallback();
+
+        private PrintHeavyweightComponentsCallback() {}
+        public void run(Component comp, Graphics cg) {
+            if (!comp.isLightweight()) {
+                comp.printAll(cg);
+            } else if (comp instanceof Container) {
+                runComponents(((Container)comp).getComponents(), cg,
+                              LIGHTWEIGHTS | HEAVYWEIGHTS);
+            }
+        }
+        public static PrintHeavyweightComponentsCallback getInstance() {
+            return instance;
+        }
+    }
+}