aplet.java

http://w3eval.calcsharp.net/ W3Eval is Java applet that evaluates mathematical expressions. It uses

         else if ( e.getKeyCode()==KeyEvent.VK_R )
            {
            if ( jRadioButtonMenuItem1.isSelected() )
               drg='D';
            else if ( jRadioButtonMenuItem2.isSelected() )
               drg='R';
            else if ( jRadioButtonMenuItem3.isSelected() )
               drg='G';

            Vector	rez;
            rez=Izracunavanje.rezultat( tokeni );
           	rezultat.append( (String)rez.elementAt( 0 ) );
            }
         }
/*
   	if ( e.getKeyCode()==KeyEvent.VK_ESCAPE )
   		{
   		System.exit( 0 );
   		}
*/
      if ( e.getModifiers()==2 && e.getKeyCode()==KeyEvent.VK_L )
         {
         izrazi.setText( "" );
         }

      if ( e.getModifiers()==2 && e.getKeyCode()==KeyEvent.VK_D )
         {
         Varijabla v=null;

         rezultat.setText( "" );
         for ( int i=varijable.size()-1; i>=0; i-- )
            {
            v=(Varijabla)varijable.elementAt( i );
            rezultat.append( v.varijabla + " = " + v.vrijednost + "\n" );
            }
         }
/*
      else if ( e.getModifiers()==8 && e.getKeyCode()==KeyEvent.VK_O )
         {
         Operator o=null;

         rezultat.setText( "" );
         for ( int i=operatori.size()-1; i>=0; i-- )
            {
            o=(Operator)operatori.elementAt( i );
            rezultat.append( o.operator + " ; " + o.prioritet + "\n" );
            }
         }
      else if ( e.getModifiers()==8 && e.getKeyCode()==KeyEvent.VK_F )
         {
         Funkcija f=null;

         rezultat.setText( "" );
         for ( int i=funkcije.size()-1; i>=0; i-- )
            {
            f=(Funkcija)funkcije.elementAt( i );
            rezultat.append( f.funkcija + " ; " + f.broj_argumenata + "\n" );
            }
         }
*/
   	else if ( e.getKeyCode()==KeyEvent.VK_S && e.getModifiers()==2 )
   		{
         String s=izrazi.getText();
         int p=izrazi.getCaretPosition();
         Raspon r=Izrazi.raspon_trenutnog_izraza( s, p );
         if ( r!=null )
            {
            izrazi.setSelectionStart( r.pocetak );
            izrazi.setSelectionEnd( r.kraj );
            }
   		}
   	else if ( e.getKeyCode()==KeyEvent.VK_TAB )
   		{
     		if ( e.getModifiers()==0 )
   			rezultat.requestFocus();
      	else
       		drvo.requestFocus();
   		e.consume();
   		}
      }

   void rezultat_keyPressed(KeyEvent e)
   	{
		if ( e.getKeyCode()==KeyEvent.VK_TAB )
			{
	  		if ( e.getModifiers()==0 )
				drvo.requestFocus();
	   	else
	    		izrazi.requestFocus();
			e.consume();
			}
		}

   void drvo_mouseClicked( MouseEvent e )
      {
      // popup meni na desni klik
      if ( e.getModifiers() == Event.META_MASK )
         {
         drvo.add( drvo_popup );
         drvo_popup.show( drvo, e.getX(), e.getY() );
         }
      else if ( e.getClickCount()==2 )
         {
         DefaultMutableTreeNode node = (DefaultMutableTreeNode)drvo.getLastSelectedPathComponent();
         if ( node!=null && node.isLeaf() )
            umetanje_tokena( node );
         }
      }

   void drvo_keyPressed( KeyEvent e )
      {
      if ( e.getKeyCode()==KeyEvent.VK_ENTER )
         {
         DefaultMutableTreeNode node = (DefaultMutableTreeNode)drvo.getLastSelectedPathComponent();
         if ( node!=null && node.isLeaf() )
            umetanje_tokena( node );
         }
      }

   void umetanje_tokena( DefaultMutableTreeNode node )
      {
      String s=(String)node.getUserObject();
      izrazi.insert( s, izrazi.getCaretPosition() );
      }

   void izrazi_mouseClicked(MouseEvent e)
      {
      // na desni klik
      if ( e.getModifiers() == Event.META_MASK )
         {
         izrazi.add( izrazi_popup );
         izrazi_popup.show( izrazi, e.getX(), e.getY() );
         }
      }

   void izrazi_about_popup_actionPerformed(ActionEvent e)
      {
      rezultat.setText( "W3Eval DEMO\n" );
      }

   void izrazi_explain_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_ENTER );
      izrazi_keyPressed( k );
      }

   void izrazi_background_popup_actionPerformed(ActionEvent e)
      {
      Color color = JColorChooser.showDialog( this, "Background Color", izrazi.getBackground() );
      if ( color != null )
         izrazi.setBackground( color );
      this.repaint();
      }

   void izrazi_foreground_popup_actionPerformed(ActionEvent e)
      {
      Color color = JColorChooser.showDialog( this, "Foreground Color", izrazi.getForeground() );
      if ( color != null )
         izrazi.setForeground( color );
      this.repaint();
      }

   void rezultat_background_popup_actionPerformed(ActionEvent e)
      {
      Color color = JColorChooser.showDialog( this, "Background Color", rezultat.getBackground() );
      if ( color != null )
         rezultat.setBackground( color );
      this.repaint();
      }

   void rezultat_foreground_popup_actionPerformed(ActionEvent e)
      {
      Color color = JColorChooser.showDialog( this, "Foreground Color", rezultat.getForeground() );
      if ( color != null )
         rezultat.setForeground( color );
      this.repaint();
      }

   void rezultat_mouseClicked(MouseEvent e)
      {
      // na desni klik
      if ( e.getModifiers() == Event.META_MASK )
         {
         rezultat.add( rezultat_popup );
         rezultat_popup.show( rezultat, e.getX(), e.getY() );
         }
      }

   void izrazi_normalize_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_N );
      izrazi_keyPressed( k );
      }

   void izrazi_parse_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_P );
      izrazi_keyPressed( k );
      }

   void izrazi_evaluate_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_E );
      izrazi_keyPressed( k );
      }

   void izrazi_reduce_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_R );
      izrazi_keyPressed( k );
      }

   void drvo_expand_popup_actionPerformed(ActionEvent e)
      {
      int red=0;
      while ( red < drvo.getRowCount() )
         {
         drvo.expandRow( red );
         red++;
         }
      }

   void drvo_collapse_popup_actionPerformed(ActionEvent e)
      {
      int red = drvo.getRowCount() - 1;
      while ( red >= 0)
         {
         drvo.collapseRow( red );
         red--;
         }
      }

   /*
   void izrazi_help_popup_actionPerformed( ActionEvent e )
      {
      URL adresa=null;
      String s = "http://geodet.geof.hr/~mstepan/nik/help.html";
      AppletContext kontekst = getAppletContext();
      try
         {
         adresa = new URL( s );
         kontekst.showDocument( adresa );
         }
      catch ( MalformedURLException m )
         {
         rezultat.setText( "Malformed URL Exception" );
         }
      }
   */

   void izrazi_select_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_S );
      izrazi_keyPressed( k );
      }

   void izrazi_variables_popup_actionPerformed(ActionEvent e)
      {
      KeyEvent k = new KeyEvent( izrazi, 0, 0, 2, KeyEvent.VK_D );
      izrazi_keyPressed( k );
      }

   void drvo_expand_selection_popup_actionPerformed(ActionEvent e)
      {
      int red=0;
      while ( red < drvo.getRowCount() )
         {
         if ( drvo.isRowSelected( red ) )
            drvo.expandRow( red );
         red++;
         }
      }

   void drvo_collapse_selection_popup_actionPerformed(ActionEvent e)
      {
      int red = drvo.getRowCount() - 1;
      while ( red >= 0)
         {
         if ( drvo.isRowSelected( red ) )
            drvo.collapseRow( red );
         red--;
         }
      }

   void izrazi_clear_popup_actionPerformed(ActionEvent e)
      {
      izrazi.setText( "" );
      }

   void osvjezavanje()
      {
      SwingUtilities.updateComponentTreeUI( this );
      SwingUtilities.updateComponentTreeUI( drvo_popup );
      SwingUtilities.updateComponentTreeUI( izrazi_popup );
      SwingUtilities.updateComponentTreeUI( rezultat_popup );
      jScrollPane3.setBorder(null);
      jScrollPane2.setBorder(null);
      jScrollPane1.setBorder(null);
      jSplitPane1.setBorder(null);
      jSplitPane2.setBorder(null);
      }

   void jMenuItem1_actionPerformed(ActionEvent e)
      {
      try
         {
         UIManager.setLookAndFeel( "javax.swing.plaf.metal.MetalLookAndFeel" );
         }
      catch ( Exception e1 )
         {
         }
      osvjezavanje();
      }

   void jMenuItem2_actionPerformed(ActionEvent e)
      {
      try
         {
         UIManager.setLookAndFeel( "com.sun.java.swing.plaf.windows.WindowsLookAndFeel" );
         }
      catch ( Exception e2 )
         {
         }
      osvjezavanje();
      }

   void jMenuItem3_actionPerformed(ActionEvent e)
      {
      try
         {
         UIManager.setLookAndFeel( "com.sun.java.swing.plaf.motif.MotifLookAndFeel" );
         }
      catch ( Exception e2 )
         {
         }
      osvjezavanje();
      }

   } // kraj klase Aplet