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-rw-r--r-- | embeddedobj/test/Container1/NativeView.java | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/embeddedobj/test/Container1/NativeView.java b/embeddedobj/test/Container1/NativeView.java new file mode 100644 index 000000000..d94eeece1 --- /dev/null +++ b/embeddedobj/test/Container1/NativeView.java @@ -0,0 +1,166 @@ +/* + * 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 ; +} + |