add 3-0-MVC

java/3-0-MVC/triangle/view/SimpleTextView.java

+package view;
+
+import model.IView;
+import model.TriangleModel;
+
+import javax.swing.*;
+import java.awt.event.*;
+import java.text.NumberFormat;
+
+/*
+ * View a triangle as text:  numbers for the base, height, and hypotenuse.
+ * This view leaves a lot to be desired in terms of "polish".
+ * -- inconsistent decimal precision displayed, esp. in hypotenuse
+ * -- tabbing or clicking out of a text field doesn't update
+ * -- can edit the hypotenuse field
+ * 
+ * @author Byron Weber Becker
+ */
+public class SimpleTextView extends JPanel implements IView {
+
+	private TriangleModel model;
+	
+	private JTextField baseTF = new JTextField(10);
+	private JTextField heightTF = new JTextField(10);
+	private JTextField hypoTF = new JTextField(10);
+
+	public SimpleTextView(TriangleModel aModel) {
+		super();
+		this.model = aModel;
+		this.layoutView();
+		this.registerControllers();
+
+		// Add a this view as a listener to the model
+		this.model.addView(this);
+	}
+	
+	/**
+	 * What to do when the model changes.
+	 */
+	public void updateView() {
+		baseTF.setText("" + model.getBase());
+		heightTF.setText("" + model.getHeight());
+		hypoTF.setText("" + model.getHypotenuse());
+	}
+
+	private void layoutView() {
+		this.setLayout(new FormLayout());
+		this.add(new JLabel("Base:"));
+		this.add(this.baseTF);
+		this.add(new JLabel("Height:"));
+		this.add(this.heightTF);
+		this.add(new JLabel("Hypotenuse:"));
+		this.add(this.hypoTF);
+	}
+
+	private void registerControllers() {
+		// Add a controller to interpret user actions in the base text field
+		this.baseTF.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent evt) {
+				double base = Double.parseDouble(baseTF.getText());
+				model.setBase(base);
+			}
+		});
+
+		// Add a controller to interpret user actions in the height text field
+		this.heightTF.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent evt) {
+				double height = Double.parseDouble(heightTF.getText());
+				model.setHeight(height);
+			}
+		});
+	}
+}
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java/3-0-MVC/triangle/view/SliderView.java

+package view;
+
+import model.*;
+
+import javax.swing.*;
+import javax.swing.event.*;
+
+public class SliderView extends JPanel {
+	private TriangleModel model;
+	private JSlider baseSlider = new JSlider(0, (int) TriangleModel.MAX_HYPO);
+	private JSlider heightSlider = new JSlider(0, (int) TriangleModel.MAX_HYPO);
+	private JSlider hypoSlider = new JSlider(0, (int) TriangleModel.MAX_HYPO);
+
+	public SliderView(TriangleModel aModel) {
+		super();
+		this.model = aModel;
+		this.layoutView();
+		this.registerControllers();
+		this.model.addView(new IView() {
+			public void updateView() {
+				baseSlider.setValue((int) model.getBase());
+				heightSlider.setValue((int) model.getHeight());
+				hypoSlider.setValue((int) model.getHypotenuse());
+			}
+		});
+	}
+
+	private void layoutView() {
+		this.setLayout(new FormLayout());
+		this.add(new JLabel("Base:"));
+		this.add(this.baseSlider);
+		this.add(new JLabel("Height:"));
+		this.add(this.heightSlider);
+		this.add(new JLabel("Hypotenuse:"));
+		this.add(this.hypoSlider);
+
+		this.baseSlider.setMajorTickSpacing((int) TriangleModel.MAX_HYPO / 10);
+		this.baseSlider.setPaintTicks(true);
+
+		this.heightSlider
+				.setMajorTickSpacing((int) TriangleModel.MAX_HYPO / 10);
+		this.heightSlider.setPaintTicks(true);
+
+		this.hypoSlider.setMajorTickSpacing((int) TriangleModel.MAX_HYPO / 10);
+		this.hypoSlider.setPaintTicks(true);
+
+		this.hypoSlider.setEnabled(false);
+	}
+
+	private void registerControllers() {
+		this.baseSlider.addChangeListener(new BaseController());
+		this.heightSlider.addChangeListener(new HeightController());
+	}
+
+	private class BaseController implements ChangeListener {
+		public void stateChanged(ChangeEvent e) {
+			double base = baseSlider.getValue();
+			model.setBase(base);
+		}
+	}
+
+	private class HeightController implements ChangeListener {
+		public void stateChanged(ChangeEvent e) {
+			double height = heightSlider.getValue();
+			model.setHeight(height);
+		}
+	}
+}

java/3-0-MVC/triangle/view/SpinnerView.java

+package view;
+
+import java.text.NumberFormat;
+
+import model.*;
+
+import javax.swing.*;
+import javax.swing.event.*;
+
+public class SpinnerView extends JPanel {
+	private TriangleModel model;
+
+	// The spinner requires a number model that specifies the starting
+	// value, the minimum, maximum, and step size.
+	private JSpinner base = new JSpinner(new SpinnerNumberModel(1, 1,
+			TriangleModel.MAX_SIDE, 1));
+	private JSpinner height = new JSpinner(new SpinnerNumberModel(1, 1,
+			TriangleModel.MAX_SIDE, 1));
+	private JLabel hypo = new JLabel();
+	private static final NumberFormat formatter = NumberFormat
+			.getNumberInstance();
+
+	public SpinnerView(TriangleModel aModel) {
+		super();
+		this.model = aModel;
+		this.layoutView();
+		this.registerControllers();
+
+		this.model.addView(new IView() {
+			public void updateView() {
+				base.setValue(new Double(model.getBase()));
+				height.setValue(new Double(model.getHeight()));
+				hypo.setText(formatter.format(model.getHypotenuse()));
+			}
+		});
+
+	}
+
+	private void layoutView() {
+		this.setLayout(new FormLayout());
+		this.add(new JLabel("Base:"));
+		this.add(this.base);
+		this.add(new JLabel("Height:"));
+		this.add(this.height);
+		this.add(new JLabel("Hypotenuse:"));
+		this.add(this.hypo);
+
+	}
+
+	private void registerControllers() {
+		// Instantiate an anonymous ChangeListener class.
+		// Then add it to both spinners. Having one class
+		// that handles both spinners is one style; I prefer
+		// having separate listeners, one for each widget.
+		ChangeListener sc = new ChangeListener() {
+			public void stateChanged(ChangeEvent e) {
+				JSpinner src = (JSpinner) e.getSource();
+				double val = ((Double) src.getValue()).doubleValue();
+				if (src == SpinnerView.this.base) {
+					SpinnerView.this.model.setBase(val);
+				} else if (src == SpinnerView.this.height) {
+					SpinnerView.this.model.setHeight(val);
+				} else {
+					assert false;
+				}
+			}
+		};
+
+		this.base.addChangeListener(sc);
+		this.height.addChangeListener(sc);
+	}
+}
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java/3-0-MVC/triangle/view/TextView.java

+package view;
+
+import model.IView;
+import model.TriangleModel;
+
+import javax.swing.*;
+import java.awt.event.*;
+import java.text.NumberFormat;
+
+/*
+ * View a triangle as text:  numbers for the base, height, and hypotenuse.
+ * 
+ * @author Byron Weber Becker
+ */
+public class TextView extends JPanel {
+
+	private TriangleModel model;
+
+	private JTextField baseTF = new JTextField(10);
+	private JTextField heightTF = new JTextField(10);
+	private JTextField hypoTF = new JTextField(10);
+
+	// To format numbers consistently in the text fields.
+	private static final NumberFormat formatter = NumberFormat
+			.getNumberInstance();
+
+	public TextView(TriangleModel aModel) {
+		super();
+		this.model = aModel;
+		this.layoutView();
+		this.registerControllers();
+
+		// There's no need to do this for such a simple view, but for a complex
+		// view you might have several ViewUpdate objects registered with
+		// the model.
+		this.model.addView(new IView() {
+			public void updateView() {
+				baseTF.setText(formatter.format(model.getBase()));
+				heightTF.setText(formatter.format(model.getHeight()));
+			}
+		});
+
+		this.model.addView(new IView() {
+			public void updateView() {
+				hypoTF.setText(formatter.format(model.getHypotenuse()));
+			}
+		});
+	}
+
+	private void layoutView() {
+		this.setLayout(new FormLayout());
+		this.add(new JLabel("Base:"));
+		this.add(this.baseTF);
+		this.add(new JLabel("Height:"));
+		this.add(this.heightTF);
+		this.add(new JLabel("Hypotenuse:"));
+		this.add(this.hypoTF);
+
+		// Don't allow the user to edit the hypotenuse
+		this.hypoTF.setEditable(false); // can still select and copy
+		//this.hypoTF.setEnabled(false); // greyed out, can't select
+	}
+
+	private void registerControllers() {
+		this.baseTF.addActionListener(new BaseController());
+		this.baseTF.addFocusListener(new BaseFocusController());
+
+		CombinedHeightController hc = new CombinedHeightController();
+		this.heightTF.addActionListener(hc);
+		this.heightTF.addFocusListener(hc);
+	}
+
+	private class BaseController implements ActionListener {
+		public void actionPerformed(ActionEvent evt) {
+			double base = Double.parseDouble(baseTF.getText());
+			model.setBase(base);
+		}
+	}
+
+	private class BaseFocusController implements FocusListener {
+		public void focusGained(FocusEvent evt) {
+			//baseTF.selectAll();
+		}
+
+		public void focusLost(FocusEvent evt) {
+			// Note duplicated code.
+			double value = Double.parseDouble(baseTF.getText());
+			model.setBase(value);
+		}
+	}
+
+	private class CombinedHeightController implements ActionListener,
+			FocusListener {
+		private void setHeight() {
+			double height = Double.parseDouble(heightTF.getText());
+			model.setHeight(height);
+		}
+
+		public void actionPerformed(ActionEvent evt) {
+			this.setHeight();
+		}
+
+		public void focusGained(FocusEvent evt) {
+			//heightTF.selectAll();
+		}
+
+		public void focusLost(FocusEvent evt) {
+			this.setHeight();
+			baseTF.requestFocus(); // skip over hypotenuse
+		}
+	}
+}
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