FileDocCategorySizeDatePackage
TV.javaAPI DocExample5633Wed Jan 27 11:34:16 GMT 1999None

TV

public class TV extends JPanel
TV - Main GUI View of one Exam. Has a JToolbar and a JPanel managed by a CardLayout to show one QView at a time.

Fields Summary
TD
theTD
The data model
JFrame
frm
The Frame above us
JToolBar
toolBar
A toolbar for editing icons
CardLayout
myCardLayout
A cardLayout for the many questions
JTextField
numTF
A number choice entry
JSlider
numSlider
A number chooser.
JPanel
questionsPanel
A panel to hold all the qview's, managed by myCardLayout
FileDialog
fc
The obligatory file chooser
ExamInfo
xinfo
The data
Constructors Summary
public TV(JFrame f, TD mod)
Construct the TV object - that is, the main GUI for the program

		super();
		frm = f;
		theTD = mod;
		JButton b; 

		// Build the GUI

		toolBar = new JToolBar();
		toolBar.setFloatable(false);
		toolBar.getAccessibleContext().setAccessibleName("File Toolbar");
		toolBar.addSeparator();
		b = addTool(toolBar, "Cut");
		b = addTool(toolBar, "Copy");
		b = addTool(toolBar, "Paste");
		toolBar.addSeparator();
		toolBar.putClientProperty( "JToolBar.isRollover", Boolean.FALSE );
		
		// The Slider
		numSlider= new JSlider(JSlider.HORIZONTAL, 1, 40, 1);
		numSlider.setPaintTicks(true);
		numSlider.setPaintLabels(false);
		numSlider.setMajorTickSpacing(10);
		numSlider.setMinorTickSpacing( 2);
		numSlider.setExtent(1);
		numSlider.addChangeListener(new ChangeListener() {
			public void stateChanged(ChangeEvent ce) {
				// System.out.println("CHANGE: " + ce);
				setQNumber(((JSlider)(ce.getSource())).getValue());
			}
		});
		numSlider.setToolTipText("Slide to select question by number");
		toolBar.add(numSlider);

		// The Question# textfield
		toolBar.add(numTF = new JTextField("01"));
		numTF.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String num = ((JTextField)e.getSource()).getText();
				int n = Integer.parseInt(num.trim());
				setQNumber(n);
			}
		});
		numTF.setToolTipText("Type number to select question by number");

		// The First Button
		b = addTool(toolBar, "First");
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				setQNumber(1);
			}
		});

		// The Previous Button
		b = addTool(toolBar, "Previous");
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (getQNumber() <= 1)
					return;
				setQNumber(getQNumber() - 1);
			}
		});

		// The Next Button
		b = addTool(toolBar, "Next");
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (getQNumber() >= getNumQuestions())
					return;
				setQNumber(getQNumber() + 1);
			}
		});
  
		// The "Last" Button
		b = addTool(toolBar, "Last");
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				setQNumber(getNumQuestions());
			}
		});
  
		add(BorderLayout.NORTH, toolBar); 

		// Rest is a panel to hold the questions, one at a time.
		questionsPanel = new JPanel();
		questionsPanel.setLayout(myCardLayout = new CardLayout());

		add(BorderLayout.SOUTH, questionsPanel);

		fc = new FileDialog(frm);
		fc.setFilenameFilter(new FilenameFilter() {
			public boolean accept(File f, String fname) {
				System.out.println("accept("+fname+")");
				return fname.endsWith(".xam");
			}
		});
		TV.centre(fc);
Methods Summary
public static javax.swing.JButtonaddTool(javax.swing.JToolBar toolBar, java.lang.String name)
Simple convenience routine for adding a button/icon to a Toolbar

		JButton b; 
		b = new JButton(new ImageIcon("images/" + name + ".gif",name));
		toolBar.add(b);
		b.setToolTipText(name);
		b.setMargin(new Insets(0,0,0,0));
		b.getAccessibleContext().setAccessibleName(name);
		return b;
public static voidcentre(java.awt.Window w)
Centre a Window on the screen

		Dimension us = w.getSize(), 
			them = Toolkit.getDefaultToolkit().getScreenSize();
		int newX = (them.width - us.width) / 2;
		int newY = (them.height- us.height)/ 2;
		w.setLocation(newX, newY);
protected intgetNumQuestions()
Return the number of questions

		return theTD.curX.getNumQuestions();
public java.awt.DimensiongetPreferredSize()
Pure guesswork

		return new Dimension(500, 400);
protected intgetQNumber()
Return the currently selected number

		return numSlider.getValue();
public voidinstallQVs()
Connect the vector of QV's into the main View

		Exam thisExam = theTD.curX;
		Vector qv = thisExam.getqvs();
		for (int i=0; i<qv.size(); i++) {
			// Use question number (1-origin) as string name.
			// System.out.println("Add question " +i +" to " + questionsPanel);
			questionsPanel.add(Integer.toString(i+1),(Component)qv.elementAt(i));
		}
		myCardLayout.first(questionsPanel);
public voidsetNumQuestions(int i)
Set the maximum number of questions

		numSlider.setMaximum(i);
protected voidsetQNumber(int nn)
Change the view to display a given question number (1-origin)

		String userShowNumber = Integer.toString(nn);

		System.out.println("setQNumber(" + userShowNumber + ");");

		// notify the model
		//	TODO -- if necessary!

		// update the view
		numTF.setText(userShowNumber);
		numSlider.setValue(nn);

		// show the right question
		myCardLayout.show(questionsPanel, userShowNumber);
public voidsetTitle(java.lang.String s)

		frm.setTitle(s);
protected voidshowStats(TStat t)

		JOptionPane.showMessageDialog(frm, t.toString());