The following illustrates using MouseWheelListener on AWT Frame. MouseWheelEvent is generated when a mouse wheel is moved.
When the mouse wheel is pushed to the opposite side then the label is moved upwards so is y-amt where y is the current y co-ordinate. Here, x co-ordinate is kept constant. Note that MouseWheelListener is added to the Frame and not to the Label but the effect is on Label.
FrameMouseWheelListener(): This invokes code illustrating the MouseWheelEvent on AWT Frame.
Next: Using WindowListener for AWT Frame
import java.awt.*;
import java.awt.event.*;
class FrameMouseWheelListener extends Frame implements MouseWheelListener
{
Label l;
public FrameMouseWheelListener()
{
createAndShowGUI();
}
private void createAndShowGUI()
{
setTitle("MouseWheelEvent for Frame Demo");
setLayout(new FlowLayout());
l=new Label("I go up and down");
add(l);
// Add MouseWheelListener to this frame
addMouseWheelListener(this);
setSize(400,400);
setVisible(true);
}
public void mouseWheelMoved(MouseWheelEvent me)
{
// Get current co-ordinates
int x=l.getX();
int y=l.getY();
// Get the amount to scroll
int amt=me.getScrollAmount();
// -1 = upward; 1 = downward
if(me.getWheelRotation()==-1)
l.setLocation(x,y-amt);
else
l.setLocation(x,y+amt);
}
public static void main(String args[])
{
new FrameMouseWheelListener();
}
}When the mouse wheel is pushed to the opposite side then the label is moved upwards so is y-amt where y is the current y co-ordinate. Here, x co-ordinate is kept constant. Note that MouseWheelListener is added to the Frame and not to the Label but the effect is on Label.
FrameMouseWheelListener(): This invokes code illustrating the MouseWheelEvent on AWT Frame.
