OpenlookButtonpublic class OpenlookButton extends Component | OpenlookButton - a class that produces a lightweight button.
Lightweight components can have "transparent" areas, meaning that
you can see the background of the container behind them. |
| Fields Summary |
|---|
| static int | capWidth | | String | label | | protected boolean | pressed | | ActionListener | actionListener |
| Constructors Summary |
|---|
public OpenlookButton()Constructs an OpenlookButton with no label. // Post action events to listeners
this("");
| public OpenlookButton(String label)Constructs an OpenlookButton with the specified label.
this.label = label;
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
|
| 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 java.lang.String | getLabel()gets the label
return label;
| | public java.awt.Dimension | getMinimumSize()The minimum size of the button.
return new Dimension(100, 50);
| | public java.awt.Dimension | getPreferredSize()The preferred size of the button.
Font f = getFont();
if(f != null) {
FontMetrics fm = getFontMetrics(getFont());
return new Dimension(fm.stringWidth(label) + capWidth*2,
fm.getHeight() + 10);
} else {
return new Dimension(100, 50);
}
| | public void | paint(java.awt.Graphics g)paints the button
int width = getSize().width - 1;
int height = getSize().height - 1;
Color interior;
Color highlight1;
Color highlight2;
interior = getBackground();
// ***** determine what colors to use
if(pressed) {
highlight1 = interior.darker();
highlight2 = interior.brighter();
} else {
highlight1 = interior.brighter();
highlight2 = interior.darker();
}
// ***** paint the interior of the button
g.setColor(interior);
// left cap
g.fillArc(0, 0, // start
capWidth, height, // size
90, 180); // angle
// right cap
g.fillArc(width - capWidth, 0, // start
capWidth, height, // size
270, 180); // angle
// inner rectangle
g.fillRect(capWidth/2, 0, width - capWidth, height);
// ***** highlight the perimeter of the button
// draw upper and lower highlight lines
g.setColor(highlight1);
g.drawLine(capWidth/2, 0, width - capWidth/2, 0);
g.setColor(highlight2);
g.drawLine(capWidth/2, height, width - capWidth/2, height);
// upper arc left cap
g.setColor(highlight1);
g.drawArc(0, 0, // start
capWidth, height, // size
90, 180-40 // angle
);
// lower arc left cap
g.setColor(highlight2);
g.drawArc(0, 0, // start
capWidth, height, // size
270-40, 40 // angle
);
// upper arc right cap
g.setColor(highlight1);
g.drawArc(width - capWidth, 0, // start
capWidth, height, // size
90-40, 40 // angle
);
// lower arc right cap
g.setColor(highlight2);
g.drawArc(width - capWidth, 0, // start
capWidth, height, // size
270, 180-40 // angle
);
// ***** draw the label centered in the button
Font f = getFont();
if(f != null) {
FontMetrics fm = getFontMetrics(getFont());
g.setColor(getForeground());
g.drawString(label,
width/2 - fm.stringWidth(label)/2,
height/2 + fm.getHeight()/2 - fm.getMaxDescent()
);
}
| | public void | processMouseEvent(java.awt.event.MouseEvent e)Paints the button and sends 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();
|
|
