| Methods Summary |
|---|
| public static void | main(java.lang.String[] args)The main method: create an EventTester frame, and pop it up
EventTester2 et = new EventTester2();
et.setSize(500, 400);
et.show();
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| protected java.lang.String | mousemods(java.awt.event.MouseEvent e)Return a string representation of the modifiers for a MouseEvent.
Note that the methods called here are inherited from InputEvent.
int mods = e.getModifiers();
String s = "";
if (e.isShiftDown()) s += "Shift ";
if (e.isControlDown()) s += "Ctrl ";
if ((mods & InputEvent.BUTTON1_MASK) != 0) s += "Button 1 ";
if ((mods & InputEvent.BUTTON2_MASK) != 0) s += "Button 2 ";
if ((mods & InputEvent.BUTTON3_MASK) != 0) s += "Button 3 ";
return s;
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| public void | paint(java.awt.Graphics g)This method repaints the text in the window
for(int i = 0; i < lines.size(); i++)
g.drawString((String)lines.elementAt(i), 20, i*16 + 50);
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| public void | processComponentEvent(java.awt.event.ComponentEvent e)Display Component events.
switch(e.getID()) {
case ComponentEvent.COMPONENT_MOVED: showLine("COMPONENT_MOVED"); break;
case ComponentEvent.COMPONENT_RESIZED: showLine("COMPONENT_RESIZED");break;
case ComponentEvent.COMPONENT_HIDDEN: showLine("COMPONENT_HIDDEN"); break;
case ComponentEvent.COMPONENT_SHOWN: showLine("COMPONENT_SHOWN"); break;
}
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| public void | processFocusEvent(java.awt.event.FocusEvent e)Display keyboard focus events. Focus can be permanently
gained or lost, or temporarily transferred to or from a component.
if (e.getID() == FocusEvent.FOCUS_GAINED)
showLine("FOCUS_GAINED" + (e.isTemporary()?" (temporary)":""));
else
showLine("FOCUS_LOST" + (e.isTemporary()?" (temporary)":""));
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| public void | processKeyEvent(java.awt.event.KeyEvent e)Display keyboard events.
Note that there are three distinct types of key events, and that
key events are reported by key code and/or Unicode character.
KEY_PRESSED and KEY_RELEASED events are generated for all key strokes.
KEY_TYPED events are only generated when a key stroke produces a
Unicode character; these events do not report a key code.
If isActionKey() returns true, then the key event reports only
a key code, because the key that was pressed or released (such as a
function key) has no corresponding Unicode character.
Key codes can be interpreted by using the many VK_ constants defined
by the KeyEvent class, or they can be converted to strings using
the static getKeyText() method as we do here.
String eventtype, modifiers, code, character;
switch(e.getID()) {
case KeyEvent.KEY_PRESSED: eventtype = "KEY_PRESSED"; break;
case KeyEvent.KEY_RELEASED: eventtype = "KEY_RELEASED"; break;
case KeyEvent.KEY_TYPED: eventtype = "KEY_TYPED"; break;
default: eventtype = "UNKNOWN";
}
// Convert the list of modifier keys to a string
modifiers = KeyEvent.getKeyModifiersText(e.getModifiers());
// Get string and numeric versions of the key code, if any.
if (e.getID() == KeyEvent.KEY_TYPED) code = "";
else code = "Code=" + KeyEvent.getKeyText(e.getKeyCode()) +
" (" + e.getKeyCode() + ")";
// Get string and numeric versions of the Unicode character, if any.
if (e.isActionKey()) character = "";
else character = "Character=" + e.getKeyChar() +
" (Unicode=" + ((int)e.getKeyChar()) + ")";
// Display it all.
showLine(eventtype + ": " + modifiers + " " + code + " " + character);
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| public void | processMouseEvent(java.awt.event.MouseEvent e)Display mouse events that don't involve mouse motion.
The mousemods() method prints modifiers, and is defined below.
The other methods return additional information about the mouse event.
showLine() displays a line of text in the window. It is defined
at the end of this class, along with the paint() method.
String type = null;
switch(e.getID()) {
case MouseEvent.MOUSE_PRESSED: type = "MOUSE_PRESSED"; break;
case MouseEvent.MOUSE_RELEASED: type = "MOUSE_RELEASED"; break;
case MouseEvent.MOUSE_CLICKED: type = "MOUSE_CLICKED"; break;
case MouseEvent.MOUSE_ENTERED: type = "MOUSE_ENTERED"; break;
case MouseEvent.MOUSE_EXITED: type = "MOUSE_EXITED"; break;
}
showLine(mousemods(e) + type + ": [" + e.getX() + "," + e.getY() + "] " +
"num clicks = " + e.getClickCount() +
(e.isPopupTrigger()?"; is popup trigger":""));
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| public void | processMouseMotionEvent(java.awt.event.MouseEvent e)Display mouse moved and dragged mouse event. Note that MouseEvent
is the only event type that has two methods, two EventListener interfaces
and two adapter classes to handle two distinct categories of events.
Also, as seen in init(), mouse motion events must be requested
separately from other mouse event types.
String type = null;
switch(e.getID()) {
case MouseEvent.MOUSE_MOVED: type = "MOUSE_MOVED"; break;
case MouseEvent.MOUSE_DRAGGED: type = "MOUSE_DRAGGED"; break;
}
showLine(mousemods(e) + type + ": [" + e.getX() + "," + e.getY() + "] " +
"num clicks = " + e.getClickCount() +
(e.isPopupTrigger()?"; is popup trigger":""));
|
| public void | processWindowEvent(java.awt.event.WindowEvent e)Display Window events. Note the special handling of WINDOW_CLOSING
switch(e.getID()) {
case WindowEvent.WINDOW_OPENED: showLine("WINDOW_OPENED"); break;
case WindowEvent.WINDOW_CLOSED: showLine("WINDOW_CLOSED"); break;
case WindowEvent.WINDOW_CLOSING: showLine("WINDOW_CLOSING"); break;
case WindowEvent.WINDOW_ICONIFIED: showLine("WINDOW_ICONIFIED"); break;
case WindowEvent.WINDOW_DEICONIFIED: showLine("WINDOW_DEICONIFIED"); break;
case WindowEvent.WINDOW_ACTIVATED: showLine("WINDOW_ACTIVATED"); break;
case WindowEvent.WINDOW_DEACTIVATED: showLine("WINDOW_DEACTIVATED"); break;
}
// If the user requested a window close, quit the program.
// But first display a message, force it to be visible, and make
// sure the user has time to read it.
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
showLine("WINDOW_CLOSING event received.");
showLine("Application will exit in 5 seconds");
update(this.getGraphics());
try {Thread.sleep(5000);} catch (InterruptedException ie) { ; }
System.exit(0);
}
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| protected void | showLine(java.lang.String s)Add a new line to the list of lines, and redisplay
if (lines.size() == 20) lines.removeElementAt(0);
lines.addElement(s);
repaint();
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