package ij.gui;
import ij.IJ;
import java.awt.*;
import java.awt.event.*;

/** A modal dialog box with a one line message and
    "Don't Save", "Cancel" and "Save" buttons. */
public class SaveChangesDialog extends Dialog implements ActionListener, KeyListener {
    private Button dontSave, cancel, save;
    private boolean cancelPressed, savePressed;

    public SaveChangesDialog(Frame parent, String fileName) {
        super(parent, "Save?", true);
        setLayout(new BorderLayout());
        Panel panel = new Panel();
        panel.setLayout(new FlowLayout(FlowLayout.LEFT, 10, 10));
        Component message;
        if (fileName.startsWith("Save "))
            message = new Label(fileName);
        else {
            if (fileName.length()>22)
                message = new MultiLineLabel("Save changes to\n" + "\"" + fileName + "\"?");
            else
                message = new Label("Save changes to \"" + fileName + "\"?");
        }
        message.setFont(new Font("Dialog", Font.BOLD, 12));
        panel.add(message);
        add("Center", panel);
        
        panel = new Panel();
        panel.setLayout(new FlowLayout(FlowLayout.CENTER, 8, 8));
        save = new Button("  Save  ");
        save.addActionListener(this);
        save.addKeyListener(this);
        cancel = new Button("  Cancel  ");
        cancel.addActionListener(this);
        cancel.addKeyListener(this);
        dontSave = new Button("Don't Save");
        dontSave.addActionListener(this);
        dontSave.addKeyListener(this);
        if (ij.IJ.isMacintosh()) {
            panel.add(dontSave);
            panel.add(cancel);
            panel.add(save);
        } else {
            panel.add(save);
            panel.add(dontSave);
            panel.add(cancel);
        }
        add("South", panel);
        if (ij.IJ.isMacintosh())
            setResizable(false);
        pack();
        GUI.center(this);
        show();
    }
    
    public void actionPerformed(ActionEvent e) {
        if (e.getSource()==cancel)
            cancelPressed = true;
        else if (e.getSource()==save)
            savePressed = true;
        closeDialog();
    }
    
    /** Returns true if the user dismissed dialog by pressing "Cancel". */
    public boolean cancelPressed() {
        if (cancelPressed)
            ij.Macro.abort();
        return cancelPressed;
    }
    
    /** Returns true if the user dismissed dialog by pressing "Save". */
    public boolean savePressed() {
        return savePressed;
    }
    
    void closeDialog() {
        //setVisible(false);
        dispose();
    }

    public void keyPressed(KeyEvent e) { 
        int keyCode = e.getKeyCode(); 
        IJ.setKeyDown(keyCode); 
        if (keyCode==KeyEvent.VK_ENTER) 
            closeDialog(); 
        else if (keyCode==KeyEvent.VK_ESCAPE) { 
            cancelPressed = true; 
            closeDialog(); 
            IJ.resetEscape();
        } 
    } 

    public void keyReleased(KeyEvent e) {}
    public void keyTyped(KeyEvent e) {}

}