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 * Copyright (c) 2003, 2017, 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.X11;

import java.awt.Component;
import java.awt.Rectangle;
import java.awt.Insets;

import java.awt.event.ComponentEvent;

import sun.util.logging.PlatformLogger;

import sun.awt.AWTAccessor;

This class implements window which serves as content window for decorated frames.
Its purpose to provide correct events dispatching for the complex
constructs such as decorated frames.
It should always be located at (- left inset, - top inset) in the associated
decorated window.  So coordinates in it would be the same as java coordinates.
/**
 * This class implements window which serves as content window for decorated frames.
 * Its purpose to provide correct events dispatching for the complex
 * constructs such as decorated frames.
 *
 * It should always be located at (- left inset, - top inset) in the associated
 * decorated window.  So coordinates in it would be the same as java coordinates.
 */
public final class XContentWindow extends XWindow {
    private static PlatformLogger insLog = PlatformLogger.getLogger("sun.awt.X11.insets.XContentWindow");

    static XContentWindow createContent(XDecoratedPeer parentFrame) {
        final WindowDimensions dims = parentFrame.getDimensions();
        Rectangle rec = dims.getBounds();
        // Fix for  - set the location of the content window to the (-left inset, -top inset)
        Insets ins = dims.getInsets();
        if (ins != null) {
            rec.x = -ins.left;
            rec.y = -ins.top;
        } else {
            rec.x = 0;
            rec.y = 0;
        }
        final XContentWindow cw = new XContentWindow(parentFrame, rec);
        cw.xSetVisible(true);
        return cw;
    }

    private final XDecoratedPeer parentFrame;

    // A list of expose events that come when the parentFrame is iconified
    private final java.util.List<SavedExposeEvent> iconifiedExposeEvents =
            new java.util.ArrayList<SavedExposeEvent>();

    private XContentWindow(XDecoratedPeer parentFrame, Rectangle bounds) {
        super((Component)parentFrame.getTarget(), parentFrame.getShell(), bounds);
        this.parentFrame = parentFrame;
    }

    void preInit(XCreateWindowParams params) {
        super.preInit(params);
        params.putIfNull(BIT_GRAVITY, Integer.valueOf(XConstants.NorthWestGravity));
        Long eventMask = (Long)params.get(EVENT_MASK);
        if (eventMask != null) {
            eventMask = eventMask & ~(XConstants.StructureNotifyMask);
            params.put(EVENT_MASK, eventMask);
        }
    }

    protected String getWMName() {
        return "Content window";
    }
    protected boolean isEventDisabled(XEvent e) {
        switch (e.get_type()) {
          // Override parentFrame to receive MouseEnter/Exit
          case XConstants.EnterNotify:
          case XConstants.LeaveNotify:
              return false;
          // We handle ConfigureNotify specifically in XDecoratedPeer
          case XConstants.ConfigureNotify:
              return true;
          // We don't want SHOWN/HIDDEN on content window since it will duplicate XDecoratedPeer
          case XConstants.MapNotify:
          case XConstants.UnmapNotify:
              return true;
          default:
              return super.isEventDisabled(e) || parentFrame.isEventDisabled(e);
        }
    }

    // Coordinates are that of the shell
    void setContentBounds(WindowDimensions dims) {
        XToolkit.awtLock();
        try {
            // Bounds of content window are of the same size as bounds of Java window and with
            // location as -(insets)
            Rectangle newBounds = dims.getBounds();
            Insets in = dims.getInsets();
            if (in != null) {
                newBounds.setLocation(-in.left, -in.top);
            }
            if (insLog.isLoggable(PlatformLogger.Level.FINE)) {
                insLog.fine("Setting content bounds {0}, old bounds {1}",
                            newBounds, getBounds());
            }
            // Fix for 5023533:
            // Change in the size of the content window means, well, change of the size
            // Change in the location of the content window means change in insets
            boolean needHandleResize = !(newBounds.equals(getBounds()));
            boolean needPaint = width <= 0 || height <= 0;
            reshape(newBounds);
            if (needHandleResize) {
                insLog.fine("Sending RESIZED");
                handleResize(newBounds);
            }
            if (needPaint) {
                postPaintEvent(target, 0, 0, newBounds.width, newBounds.height);
            }
        } finally {
            XToolkit.awtUnlock();
        }
    }

    @Override
    public void handleExposeEvent(XEvent xev) {
        if(parentFrame.isTargetUndecorated() &&
           XWM.getWMID() != XWM.UNITY_COMPIZ_WM &&
                width <= 0 && height <= 0) {
            // WM didn't send initial ConfigureNotify, so set the bounds here
            setContentBounds(parentFrame.getDimensions());
        }
        if (width <= 0 || height <= 0) {
            return;
        }
        super.handleExposeEvent(xev);
    }

    // NOTE: This method may be called by privileged threads.
    //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!
    public void handleResize(Rectangle bounds) {
        AWTAccessor.getComponentAccessor().setSize(target, bounds.width, bounds.height);
        postEvent(new ComponentEvent(target, ComponentEvent.COMPONENT_RESIZED));
    }


    public void postPaintEvent(Component target, int x, int y, int w, int h) {
        // TODO: ?
        // get rid of 'istanceof' by subclassing:
        // XContentWindow -> XFrameContentWindow

        // Expose event(s) that result from deiconification
        // come before a deicinofication notification.
        // We reorder these events by saving all expose events
        // that come when the frame is iconified. Then we
        // actually handle saved expose events on deiconification.

        if (parentFrame instanceof XFramePeer &&
                (((XFramePeer)parentFrame).getState() & java.awt.Frame.ICONIFIED) != 0) {
            // Save expose events if the frame is iconified
            // in order to handle them on deiconification.
            iconifiedExposeEvents.add(new SavedExposeEvent(target, x, y, w, h));
        } else {
            // Normal case: [it is not a frame or] the frame is not iconified.
            super.postPaintEvent(target, x, y, w, h);
        }
    }

    void purgeIconifiedExposeEvents() {
        for (SavedExposeEvent evt : iconifiedExposeEvents) {
            super.postPaintEvent(evt.target, evt.x, evt.y, evt.w, evt.h);
        }
        iconifiedExposeEvents.clear();
    }

    private static class SavedExposeEvent {
        Component target;
        int x, y, w, h;
        SavedExposeEvent(Component target, int x, int y, int w, int h) {
            this.target = target;
            this.x = x;
            this.y = y;
            this.w = w;
            this.h = h;
        }
    }

    public String toString() {
        return getClass().getName() + "[" + getBounds() + "]";
    }
}