| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| 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. |
| * |
| * @author Andreas Schlüns |
| * @created 22.02.2002 08:47 |
| */ |
| |
| 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 overload 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 ); |
| } |
| |
| // ____________________ |
| |
| /** |
| * Overload this method to make necessary initializations here. |
| * ( e.g. get the window handle and necessary system informations ) |
| * |
| * 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 once - but call native code one time only |
| * and safe 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 informations 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 ); |
| } |
| |
| // ____________________ |
| |
| /** |
| * overload 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 register 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 call herself in a never ending loop ... |
| * So we try to use the JNI code one times only and safe already getted |
| * informations inside this class. |
| */ |
| public native int getNativeWindowSystemType(); |
| private native long getNativeWindow(); // private! => use getHWND() with cache mechanism! |
| |
| public Integer getHWND() |
| { |
| if( maHandle == null ) |
| { |
| maHandle = new Integer( (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 ; |
| } |
| |