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 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.lwawt.macosx;

import java.awt.AWTKeyStroke;
import java.awt.Point;
import java.awt.Toolkit;

import sun.awt.AWTAccessor;
import sun.awt.EmbeddedFrame;
import sun.lwawt.LWWindowPeer;

@SuppressWarnings("serial") // JDK implementation class
public class CEmbeddedFrame extends EmbeddedFrame {

    private CPlatformResponder responder;
    private static final Object classLock = new Object();
    private static volatile CEmbeddedFrame globalFocusedWindow;
    private CEmbeddedFrame browserWindowFocusedApplet;
    private boolean parentWindowActive = true;

    public CEmbeddedFrame() {
        show();
    }

    public void addNotify() {
        if (!isDisplayable()) {
            LWCToolkit toolkit = (LWCToolkit)Toolkit.getDefaultToolkit();
            LWWindowPeer peer = toolkit.createEmbeddedFrame(this);
            setPeer(peer);
            responder = new CPlatformResponder(peer, true);
        }
        super.addNotify();
    }

    public void registerAccelerator(AWTKeyStroke stroke) {}

    public void unregisterAccelerator(AWTKeyStroke stroke) {}

    protected long getLayerPtr() {
        return AWTAccessor.getComponentAccessor().<LWWindowPeer>getPeer(this)
                          .getLayerPtr();
    }

    // -----------------------------------------------------------------------
    //                          SYNTHETIC EVENT DELIVERY
    // -----------------------------------------------------------------------

    public void handleMouseEvent(int eventType, int modifierFlags, double pluginX,
                                 double pluginY, int buttonNumber, int clickCount) {
        int x = (int)pluginX;
        int y = (int)pluginY;
        Point locationOnScreen = getLocationOnScreen();
        int absX = locationOnScreen.x + x;
        int absY = locationOnScreen.y + y;

        if (eventType == CocoaConstants.NPCocoaEventMouseEntered) {
            CCursorManager.nativeSetAllowsCursorSetInBackground(true);
        } else if (eventType == CocoaConstants.NPCocoaEventMouseExited) {
            CCursorManager.nativeSetAllowsCursorSetInBackground(false);
        }

        responder.handleMouseEvent(eventType, modifierFlags, buttonNumber,
                                   clickCount, x, y, absX, absY);
    }

    public void handleScrollEvent(double pluginX, double pluginY, int modifierFlags,
                                  double deltaX, double deltaY, double deltaZ) {
        int x = (int)pluginX;
        int y = (int)pluginY;
        Point locationOnScreen = getLocationOnScreen();
        int absX = locationOnScreen.x + x;
        int absY = locationOnScreen.y + y;

        responder.handleScrollEvent(x, y, absX, absY, modifierFlags, deltaX,
                                    deltaY, NSEvent.SCROLL_PHASE_UNSUPPORTED);
    }

    public void handleKeyEvent(int eventType, int modifierFlags, String characters,
                               String charsIgnoringMods, boolean isRepeat, short keyCode,
                               boolean needsKeyTyped) {
        responder.handleKeyEvent(eventType, modifierFlags, characters, charsIgnoringMods,
                keyCode, needsKeyTyped, isRepeat);
    }

    public void handleInputEvent(String text) {
        responder.handleInputEvent(text);
    }

    // handleFocusEvent is called when the applet becames focused/unfocused.
    // This method can be called from different threads.
    public void handleFocusEvent(boolean focused) {
        synchronized (classLock) {
            // In some cases an applet may not receive the focus lost event
            // from the parent window (see 8012330)
            globalFocusedWindow = (focused) ? this
                    : ((globalFocusedWindow == this) ? null : globalFocusedWindow);
        }
        if (globalFocusedWindow == this) {
            // see bug 8010925
            // we can't put this to handleWindowFocusEvent because
            // it won't be invoced if focuse is moved to a html element
            // on the same page.
            CClipboard clipboard = (CClipboard) Toolkit.getDefaultToolkit().getSystemClipboard();
            clipboard.checkPasteboardAndNotify();
        }
        if (parentWindowActive) {
            responder.handleWindowFocusEvent(focused, null);
        }
    }

    
When the parent window is activated this method is called for all EmbeddedFrames in it.
For the CEmbeddedFrame which had focus before the deactivation this method triggers
focus events in the following order:
 1. WINDOW_ACTIVATED for this EmbeddedFrame
 2. WINDOW_GAINED_FOCUS for this EmbeddedFrame
 3. FOCUS_GAINED for the most recent focus owner in this EmbeddedFrame
The caller must not requestFocus on the EmbeddedFrame together with calling this method.
Params:
parentWindowActive – true if the window is activated, false otherwise/**
     * When the parent window is activated this method is called for all EmbeddedFrames in it.
     *
     * For the CEmbeddedFrame which had focus before the deactivation this method triggers
     * focus events in the following order:
     *  1. WINDOW_ACTIVATED for this EmbeddedFrame
     *  2. WINDOW_GAINED_FOCUS for this EmbeddedFrame
     *  3. FOCUS_GAINED for the most recent focus owner in this EmbeddedFrame
     *
     * The caller must not requestFocus on the EmbeddedFrame together with calling this method.
     *
     * @param parentWindowActive true if the window is activated, false otherwise
     */
    // handleWindowFocusEvent is called for all applets, when the browser
    // becomes active/inactive. This event should be filtered out for
    // non-focused applet. This method can be called from different threads.
    public void handleWindowFocusEvent(boolean parentWindowActive) {
        this.parentWindowActive = parentWindowActive;
        // If several applets are running in different browser's windows, it is necessary to
        // detect the switching between the parent windows and update globalFocusedWindow accordingly.
        synchronized (classLock) {
            if (!parentWindowActive) {
                this.browserWindowFocusedApplet = globalFocusedWindow;
            }
            if (parentWindowActive && globalFocusedWindow != this && isParentWindowChanged()) {
                // It looks like we have switched to another browser window, let's restore focus to
                // the previously focused applet in this window. If no applets were focused in the
                // window, we will set focus to the first applet in the window.
                globalFocusedWindow = (this.browserWindowFocusedApplet != null) ? this.browserWindowFocusedApplet
                        : this;
            }
        }
        if (globalFocusedWindow == this) {
            responder.handleWindowFocusEvent(parentWindowActive, null);
        }
    }

    public boolean isParentWindowActive() {
        return parentWindowActive;
    }

    private boolean isParentWindowChanged() {
        // If globalFocusedWindow is located at inactive parent window or null, we have swithed to
        // another window.
        return globalFocusedWindow != null ? !globalFocusedWindow.isParentWindowActive() : true;
    }

    @Override
    public void synthesizeWindowActivation(boolean doActivate) {
        if (isParentWindowActive() != doActivate) {
            handleWindowFocusEvent(doActivate);
        }
    }

    public static void updateGlobalFocusedWindow(CEmbeddedFrame newGlobalFocusedWindow) {
        synchronized (classLock) {
            if(newGlobalFocusedWindow.isParentWindowActive()) {
                globalFocusedWindow = newGlobalFocusedWindow;
            }
        }
    }
}