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/***************************************************************************
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Title: GraphBrowser/GraphBrowserFrame.java
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ID: $Id$
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Author: Stefan Berghofer, TU Muenchen
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Copyright 1997 TU Muenchen
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This class is the frame for the stand-alone application. It contains
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methods for handling menubar events.
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***************************************************************************/
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package GraphBrowser;
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import java.awt.*;
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import java.io.*;
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import awtUtilities.*;
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public class GraphBrowserFrame extends Frame {
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GraphBrowser gb;
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MenuItem i1,i2;
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String graphDir,psDir;
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public void checkMenuItems() {
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if (gb.isEmpty()) {
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i1.disable();
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i2.disable();
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} else {
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i1.enable();
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i2.enable();
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}
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}
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public boolean action(Event evt, Object arg) {
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if (evt.target instanceof MenuItem) {
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String label=(String)arg;
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if (label.equals("Quit"))
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System.exit(0);
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else if (label.equals("Export to PostScript")) {
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PS(true,label);
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return true;
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} else if (label.equals("Export to EPS")) {
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PS(false,label);
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return true;
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} else if (label.equals("Open ...")) {
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FileDialog fd=new FileDialog(this,"Open graph file",FileDialog.LOAD);
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if (graphDir!=null)
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fd.setDirectory(graphDir);
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fd.show();
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if (fd.getFile()==null) return true;
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graphDir=fd.getDirectory();
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String fname=graphDir+fd.getFile();
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GraphBrowser gb2=new GraphBrowser(fname);
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try {
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InputStream is=new FileInputStream(fname);
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gb2.initBrowser(is);
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is.close();
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} catch (IOException exn) {
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String button[]={"OK"};
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MessageDialog md=new MessageDialog(this,"Error","Can't open file "+fname+".",button);
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md.resize(350,200);
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md.show();
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return true;
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}
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remove(gb);
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add("Center",gb2);
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gb=gb2;
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checkMenuItems();
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validate();
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return true;
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}
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}
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return false;
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}
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public void PS(boolean printable,String label) {
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FileDialog fd=new FileDialog(this,label,FileDialog.SAVE);
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if (psDir!=null)
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fd.setDirectory(psDir);
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fd.show();
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if (fd.getFile()==null) return;
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psDir=fd.getDirectory();
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String fname=psDir+fd.getFile();
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if ((new File(fname)).exists()) {
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String buttons[]={"Overwrite","Cancel"};
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MessageDialog md=new MessageDialog(this,"Warning",
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"Warning: File "+fname+" already exists. Overwrite?",
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buttons);
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md.resize(350,200);
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md.show();
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if (md.getText().equals("Cancel")) return;
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}
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try {
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gb.PS(fname,printable);
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} catch (IOException exn) {
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String button[]={"OK"};
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MessageDialog md=new MessageDialog(this,"Error",
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"Unable to write file "+fname+".",button);
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md.resize(350,200);
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md.show();
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}
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}
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public GraphBrowserFrame(GraphBrowser br) {
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super("GraphBrowser");
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gb=br;
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MenuBar mb=new MenuBar();
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Menu m1=new Menu("File");
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m1.add(new MenuItem("Open ..."));
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m1.add(i1=new MenuItem("Export to PostScript"));
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m1.add(i2=new MenuItem("Export to EPS"));
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m1.add(new MenuItem("Quit"));
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checkMenuItems();
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mb.add(m1);
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setMenuBar(mb);
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add("Center",br);
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}
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}
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