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-// teched.java
-// (C) Copyright 1998 by Robert S. Sutor. All rights reserved.
-
-// We first import the classes we need from the standard Java
-// distribution. This will work with Java 1.0 or higher.
-
-import java.awt.*;
-import java.awt.event.*;
-import java.lang.*;
-import java.applet.Applet;
-
-// The following brings in the Netscape LiveConnect classes
-// that we will use.
-
-import netscape.javascript.JSObject;
-
-// These are the classes that we use that are exposed by
-// techexplorer. The first is the basic interface to the
-// plug-in. The others are the event and listener classes.
-
-import ibm.techexplorer.plugin.techexplorerPlugin;
-import ibm.techexplorer.awt.AWTEvent;
-import ibm.techexplorer.awt.event.KeyListener;
-import ibm.techexplorer.awt.event.KeyEvent;
-
-public class teched
- extends java.applet.Applet
- implements KeyListener
-{
- // The JavaScript window object
- JSObject Window = null;
- // The JavaScript document object
- JSObject Document = null;
-
- // The techexplorer plug-in instance
- techexplorerPlugin tePlugin = null;
- // The editable text area for the markup source
- TextArea markupInputArea = null;
- // The 'Clear input' button
- Button clearInputButton = null;
-
- // A utility buffer for holding the markup.
- StringBuffer markupString = new StringBuffer("");
-
- public boolean action(Event evt, Object arg) {
- // We only handle the 'Clear input' action.
-
- boolean result = false;
-
- if ( evt.target == clearInputButton ) {
- // Empty the markup edit area.
- markupInputArea.setText( "" );
-
- // Reinitialize the techexplorer document. This
- // needs to be a non-empty string to actually
- // updated the document, so we give it some
- // non-visible input.
-
- tePlugin.reloadFromTeXString( "\\(\\)" );
-
- result = true;
- }
-
- return result;
- }
-
- public void init() {
- // Initialize the components we are displaying
- // with this Java applet.
-
- clearInputButton = new Button("Clear input");
- markupInputArea = new TextArea( 5, 80 );
-
- this.setLayout( new FlowLayout() );
- this.add( markupInputArea );
- this.add( clearInputButton );
- }
-
- public void keyPressed( ibm.techexplorer.awt.event.KeyEvent e ) {
- // We don't do anything with this event given us by
- // techexplorer. But see 'keyTyped'.
- }
-
- public void keyTyped( ibm.techexplorer.awt.event.KeyEvent e ) {
- // This is a naive (but effective!) way of dealing with
- // keys coming to us from techexplorer. We grab the key
- // that was pressed and put it on the end of our markup.
- // Then we update the techexplorer window.
-
- if ( e.getSource() == tePlugin ) {
- markupInputArea.appendText(
- ( new Character( e.getKeyChar() )).toString() );
-
- // This replaces the document within the techexplorer
- // window with that gotten by parsing the string
- // passed to it.
-
- tePlugin.reloadFromTeXString( markupInputArea.getText() );
- }
- }
-
- public void keyReleased( ibm.techexplorer.awt.event.KeyEvent e ) {
- // This is where we deal with key release events coming to
- // us from the techexplorer window.
-
- switch ( e.getKeyCode() ) {
- case KeyEvent.VK_DELETE:
- // When we see a 'delete' key, we remove the last character
- // in the markup.
-
- if ( e.getSource() == tePlugin ) {
- markupString = new StringBuffer( markupInputArea.getText() );
- int length = markupString.length();
- if ( length > 0 )
- --length;
- markupString.setLength( length );
- markupInputArea.setText( markupString.toString() );
- tePlugin.reloadFromTeXString( markupInputArea.getText() );
- }
- break;
-
- case KeyEvent.VK_ENTER:
- // When we see that the 'enter' key has been pressed, we
- // insert a newline in the markup. This improves readability.
-
- if ( e.getSource() == tePlugin ) {
- markupInputArea.appendText( "\n" );
- tePlugin.reloadFromTeXString( markupInputArea.getText() );
- }
- break;
-
- default:
- break;
- }
- }
-
- public boolean keyUp( Event evt, int key )
- {
- // This key is one from the markup input area.
- // When a key is released, update the techexplorer
- // document with the current markup.
-
- boolean result = false;
-
- if ( evt.target == markupInputArea ) {
- if ( evt.id == Event.KEY_RELEASE ) {
- int length = markupInputArea.getText().length();
- if ( length > 0 )
- tePlugin.reloadFromTeXString(
- markupInputArea.getText() );
- else
- tePlugin.reloadFromTeXString( "\\(\\)" );
- }
-
- result = true;
- }
-
- return result;
- }
-
- public void start() {
- // Initialize the Netscape JavaScript objects.
-
- Window = (JSObject) JSObject.getWindow(this);
- Document = (JSObject) Window.getMember("document");
-
- // Try to get the techexplorer plug-in object.
- tePlugin = (techexplorerPlugin) Document.getMember("teInput");
-
- if ( tePlugin == null )
- // If we didn't get it, print a debug message.
- System.out.println("teched: start(): null teched");
- else
- // Otherwise add the listener for techexplorer keys.
- tePlugin.addKeyListener( (KeyListener) this );
- }
-
- public void stop() {
- if ( tePlugin == null )
- // If we don't have the techexplorer plug-in object,
- // print a debug message.
- System.out.println("teched: stop(): null teched");
- else
- // Otherwise remove the listener for techexplorer keys.
- tePlugin.removeKeyListener( (KeyListener) this );
- }
-}