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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 ;
}
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