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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the BSD license.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*************************************************************************/
// __________ Imports __________
import java.awt.*;
// __________ 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. Special helper method
* can be called more than ones - but call native code one times only
* and safe the handle and the system type on our members maHandle/maSystem!
*/
@Override
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.
*/
@Override
public Dimension getPreferredSize()
{
return new Dimension(500,300);
}
@Override
public Dimension getMaximumSize()
{
return new Dimension(1024,768);
}
@Override
public Dimension getMinimumSize()
{
return new Dimension(100,100);
}
/**
* 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.
*/
@Override
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 ;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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