I'm converting all the MouseListeners in an old hobby project into
Mouse*Handlers instead. My old MouseListeners were somewhat complex
and followed this form:
public class TooltipListener implements MouseListener {
some private variables declarations here
public void onMouseDown(Widget source, int x, int y) {}
public void onMouseMove(Widget source, int x, int y) {}
public void onMouseUp(Widget source, int x, int y) {}
public void onMouseEnter(Widget source) {}
public void onMouseLeave(Widget source) {}
private methods here
}
with some code in each onMouse* method. I then added these listeners
like this:
myCustomWidget.addMouseListener(new TooltipListener());
With the new Handler system, I have changed my class to look like the
following:
public class ToolTipHandler implements MouseMoveHandler,
MouseOverHandler, MouseDownHandler, MouseUpHandler, MouseOutHandler {
some private variables declarations here
public void onMouseMove(MouseMoveEvent event) {}
public void onMouseOver(MouseOverEvent event) {}
public void onMouseDown(MouseDownEvent event) {}
public void onMouseUp(MouseUpEvent event) {}
public void onMouseOut(MouseOutEvent event) {}
private methods here
}
Note that the ToolTipHandler class relies on shared private variables
between all the mouse methods. Each method has almost identical code
from before - the only difference are they use accessor methods from
the appropriate event object. I am adding this 5 part mouse handler
like this:
TooltipHandler handler = new TooltipHandler();
myCustomWidget.addMouseMoveHandler(handler);
myCustomWidget.addMouseOverHandler(handler);
myCustomWidget.addMouseDownHandler(handler);
myCustomWidget.addMouseUpHandler(handler);
myCustomWidget.addMouseOutHandler(handler);
Everything works great, but the code is a bit clunky and I suspect
there is a better way to do this. Is there? I'm using 1.7.1 right now,
but I'm happy to take suggestions pertaining to 2.0.
Thanks! =)
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