模拟MouseEvent，KeyEvent等

Question

I'm working on an application running on Java in a headless environment. I'm handling all input and output through custom classes; my root JPanel is drawing to a BufferedImage which is then presented to the user. However, I'm having trouble passing MouseEvents to allow the JPanel and its children to handle them.

Currently, the constructor of my main class, a child of JPanel , uses:

this.enableInputMethods(true);
this.enableEvents(~0);

Then, in onMouseDown(MouseEvent e) and friends (which do get executed):

dispatchEvent(e);

I've also tried processEvent(e) and processMouseEvent(e) , but to no avail.

I'm generating the MouseEvent using the JPanel subclass as the source, and MOUSE_PRESSED and its friends as the ID.

Is there anything else I can do either in the constructor or the event handler that will allow the JPanel to process the event as a normal event, passing it off to its children and firing any ActionEvents and focus changes?

Answer 1

I've got a workaround that I'm currently implementing, manually creating the ActionEvents and keeping track of the currently focused component. I'm working on passing MouseEvents down to child components at the moment but here's what I've got.

Component c = findComponentAt(e.getX(), e.getY());
if(c!=null){
    ActionEvent ae = new ActionEvent(c,ActionEvent.ACTION_PERFORMED,"");
    ActionListener[] listeners = c.getListeners(ActionListener.class);
    for(ActionListener l:listeners){
        l.actionPerformed(ae);
    }
    if(c.isFocusable()) setFocusedComponent(c);
}

Admittedly, it's pretty messy, but in absence of a better path to pursue I have to implement it this way.