JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1996, 2018, 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
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package sun.awt.windows;

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.SystemColor;
import java.awt.peer.PanelPeer;

import sun.awt.SunGraphicsCallback;

class WPanelPeer extends WCanvasPeer implements PanelPeer {

    // ComponentPeer overrides

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        SunGraphicsCallback.PaintHeavyweightComponentsCallback.getInstance().
            runComponents(((Container)target).getComponents(), g,
                          SunGraphicsCallback.LIGHTWEIGHTS |
                          SunGraphicsCallback.HEAVYWEIGHTS);
    }
    @Override
    public void print(Graphics g) {
        super.print(g);
        SunGraphicsCallback.PrintHeavyweightComponentsCallback.getInstance().
            runComponents(((Container)target).getComponents(), g,
                          SunGraphicsCallback.LIGHTWEIGHTS |
                          SunGraphicsCallback.HEAVYWEIGHTS);
    }

    // ContainerPeer (via PanelPeer) implementation

    @Override
    public Insets getInsets() {
        return insets_;
    }

    // Toolkit & peer internals

    Insets insets_;

    static {
        initIDs();
    }

    /**
     * Initialize JNI field IDs
     */
    private static native void initIDs();

    WPanelPeer(Component target) {
        super(target);
    }

    @Override
    void initialize() {
        super.initialize();
        insets_ = new Insets(0,0,0,0);

        Color c = ((Component)target).getBackground();
        if (c == null) {

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