| Methods Summary |
|---|
| public void | addActionListener(java.awt.event.ActionListener listener)Adds the specified action listener to receive action events
from this button.
actionListener = AWTEventMulticaster.add(actionListener, listener);
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
|
| public boolean | contains(int x, int y)Determine if click was inside round button.
int mx = getSize().width/2;
int my = getSize().height/2;
return (((mx-x)*(mx-x) + (my-y)*(my-y)) <= mx*mx);
|
| public java.lang.String | getLabel()gets the label
return label;
|
| public java.awt.Dimension | getMinimumSize()The minimum size of the button.
return new Dimension(100, 100);
|
| public java.awt.Dimension | getPreferredSize()The preferred size of the button.
Font f = getFont();
if(f != null) {
FontMetrics fm = getFontMetrics(getFont());
int max = Math.max(fm.stringWidth(label) + 40, fm.getHeight() + 40);
return new Dimension(max, max);
} else {
return new Dimension(100, 100);
}
|
| public void | paint(java.awt.Graphics g)paints the RoundButton
int s = Math.min(getSize().width - 1, getSize().height - 1);
// paint the interior of the button
if(pressed) {
g.setColor(getBackground().darker().darker());
} else {
g.setColor(getBackground());
}
g.fillArc(0, 0, s, s, 0, 360);
// draw the perimeter of the button
g.setColor(getBackground().darker().darker().darker());
g.drawArc(0, 0, s, s, 0, 360);
// draw the label centered in the button
Font f = getFont();
if(f != null) {
FontMetrics fm = getFontMetrics(getFont());
g.setColor(getForeground());
g.drawString(label,
s/2 - fm.stringWidth(label)/2,
s/2 + fm.getMaxDescent());
}
|
| public void | processMouseEvent(java.awt.event.MouseEvent e)Paints the button and distribute an action event to all listeners.
Graphics g;
switch(e.getID()) {
case MouseEvent.MOUSE_PRESSED:
// render myself inverted....
pressed = true;
// Repaint might flicker a bit. To avoid this, you can use
// double buffering (see the Gauge example).
repaint();
break;
case MouseEvent.MOUSE_RELEASED:
if(actionListener != null) {
actionListener.actionPerformed(new ActionEvent(
this, ActionEvent.ACTION_PERFORMED, label));
}
// render myself normal again
if(pressed == true) {
pressed = false;
// Repaint might flicker a bit. To avoid this, you can use
// double buffering (see the Gauge example).
repaint();
}
break;
case MouseEvent.MOUSE_ENTERED:
break;
case MouseEvent.MOUSE_EXITED:
if(pressed == true) {
// Cancel! Don't send action event.
pressed = false;
// Repaint might flicker a bit. To avoid this, you can use
// double buffering (see the Gauge example).
repaint();
// Note: for a more complete button implementation,
// you wouldn't want to cancel at this point, but
// rather detect when the mouse re-entered, and
// re-highlight the button. There are a few state
// issues that that you need to handle, which we leave
// this an an excercise for the reader (I always
// wanted to say that!)
}
break;
}
super.processMouseEvent(e);
|
| public void | removeActionListener(java.awt.event.ActionListener listener)Removes the specified action listener so it no longer receives
action events from this button.
actionListener = AWTEventMulticaster.remove(actionListener, listener);
|
| public void | setLabel(java.lang.String label)sets the label
this.label = label;
invalidate();
repaint();
|
