/*
 * Copyright 2007 the original author or authors.
 * 
 * Licensed 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  edu.ecust.swing

import  groovy.swing. *
import  javax.swing. *
import  java.awt. *

/**
 * Groovy Calculator for studying SwingBuilder
 * 
 *  @author  Daniel Sun(realbluesun@hotmail.com)
 *
 *  @since  0.1
  */

class  GroovyCalculator {
    def swing  =   new  SwingBuilder()
    JFrame frame
    def toolkit  =  Toolkit.getDefaultToolkit()
    def screenSize  =  toolkit.getScreenSize()
    
    
    def WIDTH  =   320
    def HEIGHT  =   200
     int  X  =  (screenSize.width  -  WIDTH)  /   2
     int  Y  =  (screenSize.height  -  HEIGHT)  /   2
    
     boolean  flag  =   false
    
     private   void  run() {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
        frame  =  swing.frame(title:  ' Demo ' ,
                            size: [WIDTH, HEIGHT],
                            location: [X, Y],
                            defaultCloseOperation: javax.swing.WindowConstants.DISPOSE_ON_CLOSE) {
            

            
            panel(layout:  new  BorderLayout()) {
                textField(id:  " expr " , constraints: BorderLayout.NORTH)
                
                panel(constraints: BorderLayout.CENTER) {
                    tableLayout {
                        tr {
                            td {
                                button(text: " 7 " ) {
                                    action(getAction( " 7 " ))
                                }
                            }
                            td {
                                button(text: " 8 " ) {
                                    action(getAction( " 8 " ))
                                }
                            }
                            td {
                                button(text: " 9 " ) {
                                    action(getAction( " 9 " ))
                                }
                            }
                            td {
                                button(text: " / " ) {
                                    action(getAction( " / " ))
                                }
                            }
                        }
                        tr {
                            td {
                                button(text: " 4 " ) {
                                    action(getAction( " 4 " ))
                                }
                            }
                            td {
                                button(text: " 5 " ) {
                                    action(getAction( " 5 " ))
                                }
                            }
                            td {
                                button(text: " 6 " ) {
                                    action(getAction( " 6 " ))
                                }
                            }
                            td {
                                button(text: " * " ) {
                                    action(getAction( " * " ))
                                }
                            }
                        }
                        tr {
                            td {
                                button(text: " 1 " ) {
                                    action(getAction( " 1 " ))
                                }
                            }
                            td {
                                button(text: " 2 " ) {
                                    action(getAction( " 2 " ))
                                }
                            }
                            td {
                                button(text: " 3 " ) {
                                    action(getAction( " 3 " ))
                                }
                            }
                            td {
                                button(text: " - " ) {
                                    action(getAction( " - " ))
                                }
                            }
                        }
                        tr {
                            td {
                                button(text: " 0 " ) {
                                    action(getAction( " 0 " ))
                                }
                            }
                            td {
                                button(text: " = " ) {
                                    action(name: " = " , closure:  this . & eval)
                                }
                            }
                            td {
                                button(text: " C " ) {
                                    action(name: " C " , closure:  this . & clear)
                                }
                            }
                            td {
                                button(text: " + " ) {
                                    action(getAction( " + " ))
                                }
                            }
                        }
                    }
                }
            }
        }
        
        swing.expr.setEditable( false )
        swing.expr.setHorizontalAlignment(JTextField.RIGHT)
        swing.expr.setBackground(Color.WHITE)
        
        frame.pack()
        frame.setResizable( false )
        frame.setVisible( true )
    }
    
     private   void  append(EventObject evt  =   null ) {
         if  (flag) {
            swing.expr.text  =   ""
            flag  =   false
        }
        
        String name  =  evt.source.text
        swing.expr.text  <<=  name
        swing.expr.text  =  swing.expr.text.replaceAll( " // " ,  " / " )
    }
    
     private   void  clear(EventObject evt  =   null ) {
        swing.expr.text  =   ""
    }
    
     private   void  eval(EventObject evt  =   null ) {
        String expr  =  swing.expr.text
        
        def b =   new  Binding()
        def conf = new  org.codehaus.groovy.control.CompilerConfiguration()
        conf.setSourceEncoding( ' unicode ' )
        def groovyShell  =   new  GroovyShell(b,conf)
        
         try  {
            swing.expr.text  =  groovyShell.evaluate(expr)
        }  catch  (Throwable t) {
            swing.expr.text  =   " invalid expression! "
            flag  =   true
        }
        
    }
    
    def getAction(name) {
         return  swing.action(name:name, closure:  this . & append)
    }
    
     static   void  main(args) {
         new  GroovyCalculator().run()
    }

}