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Last-Modified: Tue, 21 May 1996 20:08:40 GMT

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//****************************************************************************

// ---- version information ----

//

// ExamplesFrame.java    v 1.00 b2

// Written by:           I. van Rienen / E-mail ivr@bart.nl

// URL:                  http://www/bart.nl/~ivr

// Initial release:           v 1.00b1 01-03-1996

//                            v 1.00b2 07-03-1996 Linux choise bug fixed

//                                                Window size adjusted

// Released in public domain: v 1.00b1 01-03-1996

//

// ---- Description ----

// Java class containing methods for the the examples frame.

//

// This program and the Java source is in the public domain.

// Permission to use, copy, modify, and distribute this software

// and its documentation for NON-COMMERCIAL purposes and

// without fee is hereby granted.

//

//    Copyright 1996

//

//    Iwan van Rienen

//    Joan Maetsuyckerstr. 145

//    2593 ZG  The Hague

//    The Netherlands

//

// I am not responsible for any bugs in this program and

// possible damage to hard- or software when using this program.

//****************************************************************************

import java.awt.*;

import java.util.Vector;

import java.io.StringBufferInputStream;

import java.io.DataInputStream;



class ExamplesFrame extends Frame {

    DigSim applet;

    Choice c;

    List l;

    Vector ExamplesVector;

    String WaitMessage = "Please wait, loading available examples.";



//----------------------------------------------------------------------------

// The constructor of a new examples frame.

//----------------------------------------------------------------------------

    public ExamplesFrame( DigSim app) {

        super("DigSim examples");

        applet = app;

        Button OKButton = new Button ("OK");

        Button CancelButton = new Button ("Cancel");

        OKButton.disable();



        ExamplesVector = new Vector();



        Panel p1 = new Panel();

        p1.setLayout (new FlowLayout());

        c = new Choice();

        c.addItem ("all");

        p1.add (c);

        p1.add (OKButton);

        p1.add (CancelButton);

        Panel p2 = new Panel();

        p2.setLayout (new GridLayout(0, 1));

        l = new List (10, false);

        l. addItem (WaitMessage);

        p2.add (l);



        setLayout(new BorderLayout());

        add ("North", p2);

        add ("South", p1);



        resize(400, 275);

        show();

        resize(400, 275);

        LoadExamples();

        ShowCategorys();

        if (c.countItems() > 0) {

            ShowExamples(c.getItem(0));

        }

        l.select(0);

        OKButton.enable();

        p1.layout();



    }



//----------------------------------------------------------------------------

// Show all available examples in the specified category

//----------------------------------------------------------------------------

    public void ShowExamples (String Category) {

        Example TempExample;

        int ix;



        if (ExamplesVector.size() == 0) return; // No examples available

        l.delItems (0, l.countItems() - 1);

        for (ix = 0; ix < ExamplesVector.size(); ix++) {

            TempExample =  (Example) ExamplesVector.elementAt(ix);

            if (Category.equals (TempExample.getType()) || Category.equals("all")) {

                l.addItem (TempExample.getDescription());

            }

        }

    }



//----------------------------------------------------------------------------

// Show all available categorys

//----------------------------------------------------------------------------

    public void ShowCategorys() {

        Example TempExample;

        boolean exist;

        int ix, cl;



        if (ExamplesVector.size() == 0) return; // No examples available

        for (ix = 0; ix < ExamplesVector.size(); ix++) {

            TempExample =  (Example) ExamplesVector.elementAt(ix);

            exist = false;

            for (cl = 0; cl < c.countItems(); cl++) {

                if (c.getItem (cl).equals (TempExample.getType())) {

                    exist = true;

                }

            }

            if (!exist) {

                c.addItem (TempExample.getType());

            }

        }

    }



//----------------------------------------------------------------------------

// Load a description of all available examples

//----------------------------------------------------------------------------

    public void LoadExamples() {

        String message;

        String ExampleType = null;

        String ExampleDescription = null;

        String ExampleLocation = null;

        Example NewExample;



        while (applet.TextFileRequested != null) {

            // File loading in progress for another process.

            // wait a while.

            // System.out.println ("waiting on other process...");

            try {

                Thread.currentThread().sleep (250);

            } catch(Exception e) { }

        }

        applet.RequestedTextFileRead = false;

        applet.RequestedTextFileError = false;

        applet.TextFileRequested = "examples/description.txt";

        show();

        do {

            // System.out.println ("waiting on data...");

            try {

                Thread.currentThread().sleep (250);

            } catch(Exception e) { }

        } while (!applet.RequestedTextFileRead && !applet.RequestedTextFileError);



        if (applet.RequestedText == null || applet.RequestedTextFileError) {

            applet.TextFileRequested = null;

            String DlgButtons[] = { "OK" };

            message = "Can't read file examples/description.txt";

            SimpleDialog ExceptionDialog = new SimpleDialog(null, "Loading examples", message, DlgButtons, 1, 0, 0, SimpleDialog.IMAGE_STOP);

            return;

        }

        String PlainText = applet.RequestedText;

        applet.TextFileRequested = null;

        StringBufferInputStream sis = new StringBufferInputStream(PlainText);

        DataInputStream dis = new DataInputStream (sis);

        do {

            try {

                ExampleType = null;

                ExampleDescription = null;

                ExampleLocation = null;



                ExampleType = dis.readLine();

                if (ExampleType != null) {

                    ExampleDescription = dis.readLine();

                }

                if (ExampleType != null && ExampleDescription != null) {

                    ExampleLocation = dis.readLine();

                }

            } catch(Exception e) {

            }

            if (ExampleType != null && ExampleDescription != null && ExampleLocation != null) {

                NewExample = new Example (ExampleType, ExampleDescription, ExampleLocation);

                ExamplesVector.addElement(NewExample);

            }

        } while (ExampleType != null && ExampleDescription != null && ExampleLocation != null);



    }



//----------------------------------------------------------------------------

// Handle the events in this frame.

//----------------------------------------------------------------------------

    public boolean handleEvent(Event ev) {

        if (ev.id == Event.WINDOW_DESTROY) {

            hide();

            applet.MyExamplesFrame = null;

            return true;

        }

        return super.handleEvent(ev);

    }



//----------------------------------------------------------------------------

// Get the filename of the example

//----------------------------------------------------------------------------

    public String getFileName(String example) {

        Example TempExample;

        int ix;



        for (ix = 0; ix < ExamplesVector.size(); ix++) {

            TempExample =  (Example) ExamplesVector.elementAt(ix);

            if (example.equals (TempExample.getDescription())) {

                return TempExample.getLocation();

            }

        }

        return null;

    }



//----------------------------------------------------------------------------

// Handle all actions in this frame

//----------------------------------------------------------------------------

    public boolean action(Event ev, Object arg) {

        String FileName;

        int s;



        // System.out.println ("Action");

        if (ev.target instanceof Button) {

            String label = (String)arg;

            if (label.equals ("Cancel")) {

                hide();

                applet.MyExamplesFrame = null;

                return true;

            } else if (label.equals ("OK")) {

                s = l.getSelectedIndex();

                if (s == -1) return true;

                FileName = getFileName(l.getSelectedItem());

                hide();

                applet.UserWantsOpenExample(FileName);

                applet.MyExamplesFrame = null;

                return true;

            }

        } else if (ev.target instanceof Choice) {

            ShowExamples((String)arg);

            return true;

        } else if (ev.target instanceof List) {

            if (WaitMessage.equals ((String)arg)) return true;

            FileName = getFileName((String)arg);

            hide();

            applet.UserWantsOpenExample(FileName);

            applet.MyExamplesFrame = null;

            return true;

        }

        return false;

    }

}