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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+package embeddedobj.test;
+
+// __________ Imports __________
+
+import java.awt.*;
+import java.lang.*;
+import java.awt.event.*;
+
+// __________ Implementation __________
+
+/**
+ * Class to pass the system window handle to the OpenOffice.org toolkit.
+ * It use special JNI methods to get the system handle of used java window.
+ *
+ * Attention!
+ * Use JNI functions on already visible canvas objects only!
+ * Otherwise they can make some trouble.
+ *
+ */
+
+public class NativeView extends java.awt.Canvas
+{
+
+
+ /**
+ * ctor
+ * Does nothing really.
+ * We can use our JNI mechanism for an already visible
+ * canvas only. So we override the method for showing ( "setVisible()" )
+ * and make our initialization there. But we try to show an empty clean
+ * window till there.
+ */
+ public NativeView()
+ {
+ maHandle = null;
+ maSystem = 0;
+ this.setBackground( Color.white );
+ }
+
+
+
+ /**
+ * Override this method to make necessary initializations here.
+ * ( e.g. get the window handle and necessary system information )
+ *
+ * Why here?
+ * Because the handle seems to be available for already-visible windows
+ * only. So it's the best place to get it. The special helper method
+ * can be called more than once - but call native code one time only
+ * and save the handle and the system type on our members maHandle/maSystem!
+ */
+ public void setVisible( boolean bState )
+ {
+ getHWND();
+ }
+
+
+
+ /**
+ * to guarantee right resize handling inside a swing container
+ * ( e.g. JSplitPane ) we must provide some information about our
+ * preferred/minimum and maximum size.
+ */
+ public Dimension getPreferredSize()
+ {
+ return new Dimension( 800, 600 );
+ }
+
+ public Dimension getMaximumSize()
+ {
+ return new Dimension( 1024, 768 );
+ }
+
+ public Dimension getMinimumSize()
+ {
+ return new Dimension( 300, 300 );
+ }
+
+
+
+ /**
+ * override paint routine to show provide against
+ * repaint errors if no office view is really plugged
+ * into this canvas.
+ * If handle is present - we shouldn't paint anything further.
+ * May the remote window is already plugged. In such case we
+ * shouldn't paint it over.
+ */
+ public void paint( Graphics aGraphic )
+ {
+ if( maHandle == null )
+ {
+ Dimension aSize = getSize();
+ aGraphic.clearRect( 0, 0, aSize.width, aSize.height );
+ }
+ }
+
+
+
+ /**
+ * JNI interface of this class
+ * These two methods are implemented by using JNI mechanismen.
+ * The will be used to get the platform dependent window handle
+ * of a java awt canvas. This handle can be used to create an office
+ * window as direct child of it. So it's possible to plug Office
+ * windows in a java UI container.
+ *
+ * Note:
+ * Native code for Windows registers a special function pointer to handle
+ * window messages... But if it doesn't check for an already-registered
+ * instance of this handler it will do it twice and produce a stack overflow
+ * because such method calls itself in a never-ending loop...
+ * So we try to use the JNI code one time only and save already-obtained
+ * information inside this class.
+ */
+ public native int getNativeWindowSystemType();
+ private native long getNativeWindow(); // private! => use getHWND() with cache mechanism!
+
+ public Integer getHWND()
+ {
+ if( maHandle == null )
+ {
+ maHandle = Integer.valueOf( (int )getNativeWindow() );
+ maSystem = getNativeWindowSystemType();
+ }
+ return maHandle;
+ }
+
+
+
+ /**
+ * for using of the JNI methods it's necessary to load
+ * system library which exports it.
+ */
+ static
+ {
+ System.loadLibrary( "nativeview" );
+ }
+
+
+
+ /**
+ * @member maHandle system window handle
+ * @member maSystem info about currently used platform
+ */
+ public Integer maHandle ;
+ public int maSystem ;
+}
+