displayengine.java

一个用 java写的wap浏览器 对于浏览器感兴趣起的可以看看咯

          i = drawImage(g,i,false,"0");
        //  g.setColor(Color.darkGray);
        //  g.drawString(clsScreen.elementAt(i).toString(),x,y);
        //  g.setColor(Color.black);
        }
        else if (clsScreen.elementAt(i).toString().equals(END_TAG_IMG))
        {
          //dont need to do anything here at this stage
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_TABLE))
        {
          try {
            i = drawTable(g,i);
          }
          catch(Exception e) {
            System.out.println("Error in table " + e);
          }
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_SELECT))
        {
          i = drawSelect(g,i);
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_A))
        {
          try {
            System.out.println("found A tag");
            i = drawA(g,i);
          }
          catch(Exception e) {
            System.out.println("Error in A " + e);
          }
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_ANCHOR))
        {
          try {
            System.out.println("found anchor");
            i = drawAnchor(g,i);
          }
          catch(Exception e) {
            System.out.println("Error in anchor " + e);
          }
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_DO))
        {
          i = drawDo(g,i);
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_CARD))
        {
          i = handleCard(g,i); //handles the begin card tag
          c_intDoFound=0; //sets the number of do found in this card to 0
        }
        else if(clsScreen.elementAt(i).toString().equals(END_TAG_CARD))
        {
          if (bolTimer)
          {
            c_timerDelay=c_timerDelay * 100; //since sleep takes in milliseconds
            Thread clsth = Thread.currentThread();
            clsth.sleep(c_timerDelay);
            bolEvents = true;
          }
        }
        else if(clsScreen.elementAt(i).toString().equals(START_TAG_INPUT))
        {
          i = drawInput(g,i);
        }
        else if(clsScreen.elementAt(i).toString().equals("<b>"))
        {
    //      try {
    //        setFont(new Font("SansSerif",Font.BOLD,12));
    //      }
    //      catch(Exception e) {
    //        System.out.println("Error in anchor " + e);
    //      }
        }
        else if(clsScreen.elementAt(i).toString().equals("<u>"))
        {
        }
        else if(clsScreen.elementAt(i).toString().equals("</u>"))
        {
        }
        else if(clsScreen.elementAt(i).toString().equals("<small>"))
        {
        }
        else if(clsScreen.elementAt(i).toString().equals("</small>"))
        {
        }
        else if (clsScreen.elementAt(i).toString().equals("</b>"))
        {
    //      setFont(new Font("SansSerif",Font.PLAIN,12));
        }
        else if (clsScreen.elementAt(i).toString().equals(START_TAG_TIMER))
        {
          i = handleTimer(i);
        }
        else
        { //normal text here, word wrapping is done here too
          clsWords = split(" ",clsScreen.elementAt(i).toString());
          drawNormalText(g,clsWords,intIndent);
        }
      }
    //System.out.println("End of draweverything");
    }
    catch (Exception e)
    {
      System.out.println("draweverything threw a " + e.getClass() + " with message: " + e.getMessage());
    }
  //  this.setSize(new Dimension(160,y)); //should change the panel size dynamically.. should change
                      //the size of the scrollpane too automatically
  bolRepaintNeeded = false;
  bolRunOnce = true;
  }

  /**
  Sets the name and major version number of the operative system
  */
  public void SetOs(String strOs,int intMajor)
  {
    c_strOs = strOs;
    c_intMajor = intMajor;
  }

  /**
  Gets the name of the operative system
  */
  public String GetOSName()
  {
    return c_strOs;
  }
  /**
  Gets the major version number of the operative system
  */
  public int GetOsVersion()
  {
    return c_intMajor;
  }
}


interface WMLStringTags
{
  // WML start tags as Strings.
  public static final String START_TAG_A          = (String) "<a>";
  public static final String START_TAG_TD         = (String) "<td>";
  public static final String START_TAG_TR         = (String) "<tr>";
  public static final String START_TAG_TABLE      = (String) "<table>";
  public static final String START_TAG_P          = (String) "<p>";
  public static final String START_TAG_POSTFIELD  = (String) "<postfield>";
  public static final String START_TAG_ANCHOR     = (String) "<anchor>";
  public static final String START_TAG_ACCESS     = (String) "<access>";
  public static final String START_TAG_BR         = (String) "<br>";
  public static final String START_TAG_CARD       = (String) "<card>";
  public static final String START_TAG_DO         = (String) "<do>";
  public static final String START_TAG_FIELDSET   = (String) "<fieldset>";
  public static final String START_TAG_GO         = (String) "<go>";
  public static final String START_TAG_HEAD       = (String) "<head>";
  public static final String START_TAG_IMG        = (String) "<img>";
  public static final String START_TAG_INPUT      = (String) "<input>";
  public static final String START_TAG_NOOP       = (String) "<noop>";
  public static final String START_TAG_PREV       = (String) "<prev>";
  public static final String START_TAG_ONEVENT    = (String) "<onevent>";
  public static final String START_TAG_OPTGROUP   = (String) "<optgroup>";
  public static final String START_TAG_OPTION     = (String) "<option>";
  public static final String START_TAG_REFRESH    = (String) "<refresh>";
  public static final String START_TAG_SELECT     = (String) "<select>";
  public static final String START_TAG_NULL       = (String) "<null>";
  public static final String START_TAG_TEMPLATE   = (String) "<template>";
  public static final String START_TAG_TIMER      = (String) "<timer>";
  public static final String START_TAG_SETVAR     = (String) "<setvar>";
  public static final String START_TAG_WML        = (String) "<wml>";

  // WML end tags as Strings.
  public static final String END_TAG_A            = (String) "</a>";
  public static final String END_TAG_TD           = (String) "</td>";
  public static final String END_TAG_TR           = (String) "</tr>";
  public static final String END_TAG_TABLE        = (String) "</table>";
  public static final String END_TAG_P            = (String) "</p>";
  public static final String END_TAG_POSTFIELD    = (String) "</postfield>";
  public static final String END_TAG_ANCHOR       = (String) "</anchor>";
  public static final String END_TAG_ACCESS       = (String) "</access>";
  public static final String END_TAG_BR           = (String) "</br>";
  public static final String END_TAG_CARD         = (String) "</card>";
  public static final String END_TAG_DO           = (String) "</do>";
  public static final String END_TAG_FIELDSET     = (String) "</fieldset>";
  public static final String END_TAG_GO           = (String) "</go>";
  public static final String END_TAG_HEAD         = (String) "</head>";
  public static final String END_TAG_IMG          = (String) "</img>";
  public static final String END_TAG_INPUT        = (String) "</input>";
  public static final String END_TAG_NOOP         = (String) "</noop>";
  public static final String END_TAG_PREV         = (String) "</prev>";
  public static final String END_TAG_ONEVENT      = (String) "</onevent>";
  public static final String END_TAG_OPTGROUP     = (String) "</optgroup>";
  public static final String END_TAG_OPTION       = (String) "</option>";
  public static final String END_TAG_REFRESH      = (String) "</refresh>";
  public static final String END_TAG_SELECT       = (String) "</select>";
  public static final String END_TAG_NULL         = (String) "</null>";
  public static final String END_TAG_TEMPLATE     = (String) "</template>";
  public static final String END_TAG_TIMER        = (String) "</timer>";
  public static final String END_TAG_SETVAR       = (String) "</setvar>";
  public static final String END_TAG_WML          = (String) "</wml>";
}

/**
A public class that listens for events caused by clicking on a link
*/
class LinkListener implements MouseListener,ActionListener
{
  String strClickedLink;
  DisplayEngineCore clsDengCore;

  /**
  Sets up the variables used later on in the class
  @param link
  @param dengCore needed to be able to set the event that was
      triggered

  */


  public LinkListener(String link,DisplayEngineCore dengCore)
  {
    super();
    strClickedLink = link;
    clsDengCore = dengCore;
  }
   /**
   Convert a string to an int
   @return The integer representation of the string
   */
   private static int StringToInt(String s)
   {
      int v = 0;
      for (int i=0; i<s.length(); i++)
         v = 10*v + s.charAt(i) - '0';
      return v;
   }
  public void mouseClicked(MouseEvent e)
  {
    System.out.println("eventid: " + strClickedLink);
    clsDengCore.bolEvents = true;       //this tells the displayenginre core that
    clsDengCore.SetEventID(StringToInt(strClickedLink)); //an event occured
  }
  public void mouseEntered(MouseEvent e)
  {
  }
  public void mouseExited(MouseEvent e)
  {
  }
  public void mousePressed(MouseEvent e)
  {
  }
  public void mouseReleased(MouseEvent e)
  {
  }

  public void actionPerformed(ActionEvent e)
  {
    clsDengCore.bolEvents = true; //this tells the displayenginre core that
    clsDengCore.SetEventID(StringToInt(strClickedLink));                //an event occured
  }
}

  /**
  Public class that displays the "enter a url" dialog
  */

class UrlDialog extends Dialog implements ActionListener
{
  DisplayEngineCore clsDengCore;
  Frame frame;
  EventManagement em;
  TextField clsText;


  public UrlDialog(Frame frame,DisplayEngineCore dengCore,String dialogTitle,EventManagement in_clsEm)
  {
    super(frame,dialogTitle);
    setLayout(null);
    clsDengCore = dengCore;
    em = in_clsEm;
    //clsText = new TextField("Enter url here",15);
    clsText = new TextField(clsDengCore.c_clsBrowserCore.getAbsoluteURL(),15);
    Button btnGo      = new Button("Go");
    btnGo.setBounds(10,30,20,20);
    btnGo.addActionListener(this);
    this.addWindowListener (new CloseDialog (this));
    clsText.setSize(new Dimension(150,25));
    clsText.setBounds(40,25,70,30);
    this.add(btnGo);
    this.add(clsText);
 //   this.setSize(120,60);
    this.show();
    pack();
    validate();
    this.repaint();
  }

  public void actionPerformed(ActionEvent e)
  {
    String strUrl;
    try
    {
    strUrl = clsText.getText();
    strUrl = strUrl.toLowerCase();

    // Check if the URL entered is a relative URL or a fragment ID.
  if (strUrl.length() == 0  || strUrl.charAt(0) == '#' || strUrl.charAt(0) == '/')
    {
      // Write a message to the user somewhere to tell them that the URL is invalid.
    clsText.setText(clsDengCore.c_clsBrowserCore.getAbsoluteURL());
      return;
    }

    if (strUrl.indexOf("http://") == -1)
      strUrl = "http://" + strUrl;

    clsDengCore.SetEventID(em.registerGo(strUrl,false,"GET",""));
      }
    catch (Exception ex)
    {
      System.out.println(ex);
    }
    dispose();
    clsDengCore.bolEvents = true;
  }
}

/**
 Class to display the gateway dialog
*/
class GateWayDialog extends Dialog implements ActionListener
{
  DisplayEngineCore clsDengCore;
  Frame frame;
  EventManagement em;
  /**The user writes the gateway into this field*/
  TextField clsText;

  public GateWayDialog(Frame frame,DisplayEngineCore dengCore,String dialogTitle,EventManagement in_clsEm)
  {
    super(frame,dialogTitle);
    setLayout(null);
    clsDengCore = dengCore;
    em = in_clsEm;
    clsText = new TextField("Enter gateway here");
    Button btnGo      = new Button("Save");
    btnGo.setBounds(10,25,30,20);
    btnGo.addActionListener(this);
    this.addWindowListener (new CloseDialog (this));
    clsText.setSize(new Dimension(150,25));
    clsText.setBounds(40,25,80,30);
    this.add(btnGo);
    this.add(clsText);
    //this.setSize(120,60);
    this.show();
    pack();
    validate();
  }

  public void actionPerformed(ActionEvent e)
  {
    String strGateway;

    try
    {
    strGateway = clsText.getText();
    strGateway = strGateway.toLowerCase();
    clsDengCore.setGateway(strGateway);
      }
    catch (Exception ex)
    {
      System.out.println(ex);
    }
    dispose();
  }
}

/**
Class VariableListener listens for any changes in the variables
*/
class VariableListener implements TextListener
{
  String strName;
  BrowserCore clsBrowserCore;
  /**Contains the text that was in the input box*/
  TextField clsTextValue;

  public VariableListener(String name,BrowserCore bCore,TextField txt)
  {
    super();
    strName = name;
    clsBrowserCore = bCore;
    clsTextValue = txt;
  }

  public void textValueChanged(TextEvent e)
  {
    String value;

    value = clsTextValue.getText();
    clsBrowserCore.setVariable(strName ,value);
    System.out.println("NAME: "+strName+" VALUE: " + value);
  }
}