Java/SWT JFace Eclipse/Event
Содержание
- 1 Demonstrates ControlListeners
- 2 Demonstrates FocusListener
- 3 Demonstrates LineBackgroundListeners
- 4 Demonstrates mouse events
- 5 Demonstrates various listeners
- 6 Key Listener Example
- 7 ModifyEvent: Temperature Converter JFace
- 8 Mouse Event Listener
- 9 SelectionListener and DisposeListener
- 10 Utility class for event handling
Demonstrates ControlListeners
<source lang="java">
//Send questions, comments, bug reports, etc. to the authors: //Rob Warner (rwarner@interspatial.ru) //Robert Harris (rbrt_harris@yahoo.ru) import org.eclipse.swt.SWT; import org.eclipse.swt.events.*; import org.eclipse.swt.graphics.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; /**
* This class demonstrates ControlListeners */
public class ControlListenerExample {
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
Image image = new Image(display, "jexp.gif");
createContents(shell, image);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
if (image != null) image.dispose();
display.dispose();
}
/**
* Creates the main window"s contents
*
* @param shell the main window
* @param image the image
*/
private void createContents(Shell shell, Image image) {
shell.setLayout(new GridLayout());
// Create a label to hold the image
Label label = new Label(shell, SWT.NONE);
label.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
label.setImage(image);
shell.setData(label);
// Add the listener
shell.addControlListener(new ControlAdapter() {
public void controlResized(ControlEvent event) {
// Get the event source (the shell)
Shell shell = (Shell) event.getSource();
// Get the source"s data (the label)
Label label = (Label) shell.getData();
// Determine how big the shell should be to fit the image
Rectangle rect = shell.getClientArea();
ImageData data = label.getImage().getImageData();
// If the shell is too small, hide the image
if (rect.width < data.width || rect.height < data.height) {
shell.setText("Too small.");
label.setText("I"m melting!");
} else {
// He fits!
shell.setText("Happy Guy Fits!");
label.setImage(label.getImage());
}
}
});
}
/**
* Application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new ControlListenerExample().run();
}
}
</source>
Demonstrates FocusListener
<source lang="java">
//Send questions, comments, bug reports, etc. to the authors: //Rob Warner (rwarner@interspatial.ru) //Robert Harris (rbrt_harris@yahoo.ru) import org.eclipse.swt.SWT; import org.eclipse.swt.events.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; /**
* This class demonstrates FocusListener */
public class FocusListenerExample {
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
// Create the shell
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
shell.setText("One Potato, Two Potato");
// Create the focus listener
FocusListener listener = new FocusListener() {
public void focusGained(FocusEvent event) {
Button button = (Button) event.getSource();
button.setText("I"m It!");
}
public void focusLost(FocusEvent event) {
Button button = (Button) event.getSource();
button.setText("Pick Me!");
}
};
// Create the buttons and add the listener to each one
for (int i = 0; i < 6; i++) {
Button button = new Button(shell, SWT.PUSH);
button.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
button.setText("Pick Me!");
button.addFocusListener(listener);
}
// Display the window
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
</source>
Demonstrates LineBackgroundListeners
<source lang="java">
//Send questions, comments, bug reports, etc. to the authors: //Rob Warner (rwarner@interspatial.ru) //Robert Harris (rbrt_harris@yahoo.ru)
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.*; import org.eclipse.swt.graphics.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; /**
* This class demonstrates LineBackgroundListeners */
public class LineBackgroundListenerTest {
// The color to use for backgrounds
Color red;
/**
* Runs the application
*/
public void run() {
Display display = new Display();
red = display.getSystemColor(SWT.COLOR_RED);
Shell shell = new Shell(display);
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Creates the main window"s contents
*
* @param shell the main window
*/
private void createContents(Shell shell) {
shell.setLayout(new FillLayout());
StyledText styledText = new StyledText(shell, SWT.BORDER);
// Add the line background listener
styledText.addLineBackgroundListener(new LineBackgroundListener() {
public void lineGetBackground(LineBackgroundEvent event) {
if (event.lineText.indexOf("SWT") > -1) {
event.lineBackground = red;
}
}
});
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new LineBackgroundListenerTest().run();
}
}
</source>
Demonstrates mouse events
<source lang="java">
//Send questions, comments, bug reports, etc. to the authors: //Rob Warner (rwarner@interspatial.ru) //Robert Harris (rbrt_harris@yahoo.ru) import org.eclipse.swt.SWT; import org.eclipse.swt.events.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; /**
* This class demonstrates mouse events */
public class MouseEventExample implements MouseListener, MouseMoveListener,
MouseTrackListener {
// The label to hold the messages from mouse events
Label myLabel = null;
/**
* MouseEventExample constructor
*
* @param shell the shell
*/
public MouseEventExample(Shell shell) {
myLabel = new Label(shell, SWT.BORDER);
myLabel.setText("I ain"t afraid of any old mouse");
shell.addMouseListener(this);
shell.addMouseMoveListener(this);
shell.addMouseTrackListener(this);
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
// Create the window
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
shell.setSize(450, 200);
shell.setText("Mouse Event Example");
// Create the listener
MouseEventExample myMouseEventExample = new MouseEventExample(shell);
// Display the window
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Called when user double-clicks the mouse
*/
public void mouseDoubleClick(MouseEvent e) {
myLabel.setText("Double Click " + e.button + " at: " + e.x + "," + e.y);
}
/**
* Called when user clicks the mouse
*/
public void mouseDown(MouseEvent e) {
myLabel.setText("Button " + e.button + " Down at: " + e.x + "," + e.y);
}
/**
* Called when user releases the mouse after clicking
*/
public void mouseUp(MouseEvent e) {
myLabel.setText("Button " + e.button + " Up at: " + e.x + "," + e.y);
}
/**
* Called when user moves the mouse
*/
public void mouseMove(MouseEvent e) {
myLabel.setText("Mouse Move at: " + e.x + "," + e.y);
}
/**
* Called when user enters the shell with the mouse
*/
public void mouseEnter(MouseEvent e) {
myLabel.setText("Mouse Enter at: " + e.x + "," + e.y);
}
/**
* Called when user exits the shell with the mouse
*/
public void mouseExit(MouseEvent e) {
myLabel.setText("Mouse Exit at: " + e.x + "," + e.y);
}
/**
* Called when user hovers the mouse
*/
public void mouseHover(MouseEvent e) {
myLabel.setText("Mouse Hover at: " + e.x + "," + e.y);
}
}
</source>
Demonstrates various listeners
<source lang="java">
//Send questions, comments, bug reports, etc. to the authors: //Rob Warner (rwarner@interspatial.ru) //Robert Harris (rbrt_harris@yahoo.ru) 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 HelpListener, VerifyListener,
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.addHelpListener(this);
fahrenheit.addVerifyListener(this);
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");
// Add the listeners
celsius.addHelpListener(this);
celsius.addVerifyListener(this);
celsius.addModifyListener(this);
// 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 user requests help
*/
public void helpRequested(HelpEvent event) {
// Get the help text from the widget and set it into the help label
help.setText((String) event.widget.getData());
}
/**
* Called when the user types into a text box, but before the text box gets
* what the user typed
*/
public void verifyText(VerifyEvent event) {
// Assume we don"t allow it
event.doit = false;
// Get the character typed
char myChar = event.character;
String text = ((Text) event.widget).getText();
// Allow "-" if first character
if (myChar == "-" && text.length() == 0) event.doit = true;
// Allow 0-9
if (Character.isDigit(myChar)) event.doit = true;
// Allow backspace
if (myChar == "\b") event.doit = true;
}
/**
* 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
celsius.removeVerifyListener(this);
celsius.removeModifyListener(this);
fahrenheit.removeVerifyListener(this);
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
celsius.addVerifyListener(this);
celsius.addModifyListener(this);
fahrenheit.addVerifyListener(this);
fahrenheit.addModifyListener(this);
}
/**
* The application entry point
* @param args the command line arguments
*/
public static void main(String[] args) {
new MultipleListenersExample().run();
}
}
</source>
Key Listener Example
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.KeyListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.RowLayout; import org.eclipse.swt.widgets.rubo; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class KeyListenerExample {
Display d;
Shell s;
KeyListenerExample() {
d = new Display();
s = new Shell(d);
s.setSize(250, 200);
s.setText("A KeyListener Example");
s.setLayout(new RowLayout());
final Combo c = new Combo(s, SWT.DROP_DOWN | SWT.BORDER);
c.add("Lions");
c.add("Tigers");
c.add("Bears");
c.add("Oh My!");
c.addKeyListener(new KeyListener() {
String selectedItem = "";
public void keyPressed(KeyEvent e) {
if (c.getText().length() > 0) {
return;
}
String key = Character.toString(e.character);
String[] items = c.getItems();
for (int i = 0; i < items.length; i++) {
if (items[i].toLowerCase().startsWith(key.toLowerCase())) {
c.select(i);
selectedItem = items[i];
return;
}
}
}
public void keyReleased(KeyEvent e) {
if (selectedItem.length() > 0)
c.setText(selectedItem);
selectedItem = "";
}
});
s.open();
while (!s.isDisposed()) {
if (!d.readAndDispatch())
d.sleep();
}
d.dispose();
}
public static void main() {
new KeyListenerExample();
}
}
</source>
ModifyEvent: Temperature Converter JFace
<source lang="java">
/******************************************************************************
* Copyright (c) 1998, 2004 Jackwind Li Guojie * All right reserved. * * Created on Jan 16, 2004 8:05:36 PM by JACK * $Id$ * * visit: http://www.asprise.ru/swt *****************************************************************************/
import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; public class TemperatureConverterJFace extends ApplicationWindow {
Label fahrenheitLabel;
Label celsiusLabel;
Text fahrenheitValue;
Text celsiusValue;
public TemperatureConverterJFace() {
super(null);
addStatusLine();
}
/* (non-Javadoc)
* @see org.eclipse.jface.window.Window#createContents(org.eclipse.swt.widgets.ruposite)
*/
protected Control createContents(Composite parent) {
getShell().setText("JFace Temperature Converter");
Composite converterComposite = new Composite(parent, SWT.NULL);
converterComposite.setLayout(new GridLayout(4, false));
fahrenheitLabel = new Label(converterComposite, SWT.NULL);
fahrenheitLabel.setText("Fahrenheit: ");
fahrenheitValue = new Text(converterComposite, SWT.SINGLE | SWT.BORDER);
celsiusLabel = new Label(converterComposite, SWT.NULL);
celsiusLabel.setText("Celsius: ");
celsiusValue = new Text(converterComposite, SWT.SINGLE | SWT.BORDER);
ModifyListener listener = new ModifyListener() {
public void modifyText(ModifyEvent e) {
valueChanged((Text) e.widget);
}
};
fahrenheitValue.addModifyListener(listener);
celsiusValue.addModifyListener(listener);
return converterComposite;
}
/**
* Performs conversion when one of the text fields changes.
*
* @param text
* the event source
*/
public void valueChanged(Text text) {
if (!text.isFocusControl())
return;
if (text == fahrenheitValue) {
try {
double fValue = Double.parseDouble(text.getText());
double cValue = (fValue - 32) / 1.8;
celsiusValue.setText(Double.toString(cValue));
System.out.println("F -> C: " + cValue);
setStatus("Conversion performed successfully.");
} catch (NumberFormatException e) {
celsiusValue.setText("");
setStatus("Invalid number format: " + text.getText());
}
} else {
try {
double cValue = Double.parseDouble(text.getText());
double fValue = cValue * 1.8 + 32;
fahrenheitValue.setText(Double.toString(fValue));
System.out.println("C -> F: " + fValue);
setStatus("Conversion performed successfully.");
} catch (NumberFormatException e) {
fahrenheitValue.setText("");
setStatus("Invalid number format: " + text.getText());
}
}
}
public static void main(String[] args) {
TemperatureConverterJFace converter = new TemperatureConverterJFace();
converter.setBlockOnOpen(true);
converter.open();
Display.getCurrent().dispose();
}
}
</source>
Mouse Event Listener
<source lang="java">
/******************************************************************************
* Copyright (c) 1998, 2004 Jackwind Li Guojie * All right reserved. * * Created on Oct 27, 2003 10:38:29 PM by JACK * $Id: ListenerTest.java,v 1.1 2003/12/22 12:07:54 jackwind Exp $ * * visit: http://www.asprise.ru/swt *****************************************************************************/
import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class ListenerTest {
public ListenerTest() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Left click your mouse");
shell.setSize(200, 100);
shell.open();
shell.addListener(SWT.MouseDown, new SimpleListener("Shell mouse down listener"));
display.addFilter(SWT.MouseDown, new SimpleListener("Display mouse down Listener"));
display.addFilter(SWT.MouseUp, new SimpleListener("Display mouse up Listener"));
while(! shell.isDisposed()) {
if(! display.readAndDispatch()) {// If no more entries in event queue
display.sleep();
}
}
display.dispose();
}
class SimpleListener implements Listener{
String name;
public SimpleListener(String name) {
this.name = name;
}
public void handleEvent(Event e) {
System.out.println("Event: [" + EventUtil.getEventName(e.type) + "] from " + name + ". \tCurrent Time (in ms): " + System.currentTimeMillis());
}
}
public static void main(String[] args) {
new ListenerTest();
}
}
</source>
SelectionListener and DisposeListener
<source lang="java">
//Send questions, comments, bug reports, etc. to the authors: //Rob Warner (rwarner@interspatial.ru) //Robert Harris (rbrt_harris@yahoo.ru) import org.eclipse.swt.SWT; import org.eclipse.swt.events.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; /**
* This class demonstrates SelectionListener and DisposeListener */
public class DisposeListenerExample {
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
Display display = new Display();
// Create the main window
Shell mainShell = new Shell(display);
mainShell.setLayout(new FillLayout());
mainShell.setText("Big Brother");
final Label mainMessage = new Label(mainShell, SWT.LEFT);
mainMessage.setText("Don"t even think about it");
// Create the child shell and the dispose listener
final Shell childShell = new Shell(mainShell);
childShell.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent event) {
// When the child shell is disposed, change the message on the main shell
mainMessage.setText("Gotcha");
}
});
childShell.setLayout(new FillLayout());
childShell.setText("little brother");
// Put a message on the child shell
new Label(childShell, SWT.LEFT)
.setText("If you dispose me, my big brother"s gonna get you!");
// Add a button and a listener to the child shell
Button button = new Button(childShell, SWT.PUSH);
button.setText("Close Me!");
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
// When the button is pressed, close the child shell
childShell.close();
}
});
// Open the shells
mainShell.open();
childShell.open();
while (!mainShell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
</source>
Utility class for event handling
<source lang="java">
/******************************************************************************
* Copyright (c) 1998, 2004 Jackwind Li Guojie * All right reserved. * * Created on Oct 28, 2003 12:29:41 AM by JACK * $Id: EventUtil.java,v 1.1 2003/12/22 12:07:54 jackwind Exp $ * * visit: http://www.asprise.ru/swt *****************************************************************************/
import org.eclipse.swt.SWT; /**
* Utility class for event handling. */
public class EventUtil {
public static String getEventName(int eventType) {
switch(eventType) {
case SWT.None:
return "null";
case SWT.KeyDown:
return "key down";
case SWT.KeyUp:
return "key up";
case SWT.MouseDown:
return "mouse down";
case SWT.MouseUp:
return "mouse up";
case SWT.MouseMove:
return "mouse move";
case SWT.MouseEnter:
return "mouse enter";
case SWT.MouseExit:
return "mouse exit";
case SWT.MouseDoubleClick:
return "mouse double click";
case SWT.Paint:
return "paint";
case SWT.Move:
return "move";
case SWT.Resize:
return "resize";
case SWT.Dispose:
return "dispose";
case SWT.Selection:
return "selection";
case SWT.DefaultSelection:
return "default selection";
case SWT.FocusIn:
return "focus in";
case SWT.FocusOut:
return "focus out";
case SWT.Expand:
return "expand";
case SWT.Collapse:
return "collapse";
case SWT.Iconify:
return "iconify";
case SWT.Deiconify:
return "deiconify";
case SWT.Close:
return "close";
case SWT.Show:
return "show";
case SWT.Hide:
return "hide";
case SWT.Modify:
return "modify";
case SWT.Verify:
return "verify";
case SWT.Activate:
return "activate";
case SWT.Deactivate:
return "deactivate";
case SWT.Help:
return "help";
case SWT.DragDetect:
return "drag detect";
case SWT.Arm:
return "arm";
case SWT.Traverse:
return "traverse";
case SWT.MouseHover:
return "mouse hover";
case SWT.HardKeyDown:
return "hard key down";
case SWT.HardKeyUp:
return "hard key up";
case SWT.MenuDetect:
return "menu detect";
}
return "unkown ???";
}
public static void main(String[] args) {
}
}
</source>
