Attachment 188113 Details for Bug 336033 – RAPSlowListenerExample

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RAPSlowListenerExample

MultipleListenersExample.java (text/x-java), 3.08 KB, created by Timothy Arceri

on 2011-02-02 00:40:51 EST

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Filename:

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Creator: Timothy Arceri

Created: 2011-02-02 00:40:51 EST

Size: 3.08 KB

patch

obsolete

>package org.test;
>//Send questions, comments, bug reports, etc. to the authors:
>
>//Rob Warner (rwarner@interspatial.com)
>//Robert Harris (rbrt_harris@yahoo.com)
>
>import org.eclipse.swt.SWT;
>import org.eclipse.swt.events.*;
>import org.eclipse.swt.layout.*;
>import org.eclipse.swt.widgets.*;
>
>/**
> * This class demonstrates various listeners
> */
>public class MultipleListenersExample implements ModifyListener {
>
>  // Constants used for conversions
>  private static final double FIVE_NINTHS = 5.0 / 9.0;
>  private static final double NINE_FIFTHS = 9.0 / 5.0;
>
>  // Widgets used in the window
>  private Text fahrenheit;
>  private Text celsius;
>  private Label help;
>
>  /**
>   * Runs the application
>   */
>  public void run() {
>    Display display = new Display();
>    Shell shell = new Shell(display);
>    shell.setText("Temperatures");
>    createContents(shell);
>    shell.pack();
>    shell.open();
>    while (!shell.isDisposed()) {
>      if (!display.readAndDispatch()) {
>        display.sleep();
>      }
>    }
>    display.dispose();
>  }
>
>  /**
>   * Create the main window's contents
>   * @param shell the main window
>   */
>  private void createContents(Shell shell) {
>    shell.setLayout(new GridLayout(3, true));
>
>    // Create the label and input box for Fahrenheit
>    new Label(shell, SWT.LEFT).setText("Fahrenheit:");
>    fahrenheit = new Text(shell, SWT.BORDER);
>    GridData data = new GridData(GridData.FILL_HORIZONTAL);
>    data.horizontalSpan = 2;
>    fahrenheit.setLayoutData(data);
>
>    // Set the context-sensitive help
>    fahrenheit.setData("Type a temperature in Fahrenheit");
>
>    // Add the listeners
>    fahrenheit.addModifyListener(this);
>
>    // Create the label and input box for Celsius
>    new Label(shell, SWT.LEFT).setText("Celsius:");
>    celsius = new Text(shell, SWT.BORDER);
>    data = new GridData(GridData.FILL_HORIZONTAL);
>    data.horizontalSpan = 2;
>    celsius.setLayoutData(data);
>
>    // Set the context-sensitive help
>    celsius.setData("Type a temperature in Celsius");
>
>    // Create the area for help
>    help = new Label(shell, SWT.LEFT | SWT.BORDER);
>    data = new GridData(GridData.FILL_HORIZONTAL);
>    data.horizontalSpan = 3;
>    help.setLayoutData(data);
>  }
>
>  /**
>   * Called when the user modifies the text in a text box
>   */
>  public void modifyText(ModifyEvent event) {
>    // Remove all the listeners, so we don't enter any infinite loops
>    fahrenheit.removeModifyListener(this);
>
>    // Get the widget whose text was modified
>    Text text = (Text) event.widget;
>
>    try {
>      // Get the modified text
>      int temp = Integer.parseInt(text.getText());
>
>      // If they modified fahrenheit, convert to Celsius
>      if (text == fahrenheit) {
>        celsius.setText(String.valueOf((int) (FIVE_NINTHS * (temp - 32))));
>      } else {
>        // Convert to fahrenheit
>        fahrenheit.setText(String.valueOf((int) (NINE_FIFTHS * temp + 32)));
>      }
>    } catch (NumberFormatException e) { /* Ignore */ }
>
>    // Add the listeners back
>    fahrenheit.addModifyListener(this);
>  }
>}

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Attachments on bug 336033: 188113