Combining Aero Glass effects and SWT

问题

As a pet project, I've been playing with the concept of integrating Aero Glass effects into my SWT application. Łukasz Milewski has an excellent blog post explaining how this can be accomplished, which pretty much boils down to this:

final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FormLayout());
final MARGINS margins = new MARGINS();
margins.cyTopHeight = -1;

final Composite c = new Composite(shell, SWT.NORMAL);
c.setBackground(new Color(shell.getDisplay(), new RGB(0, 0, 0)));
final FormData fd = new FormData();
fd.top = new FormAttachment(0, 0);
fd.left = new FormAttachment(0, 0);
fd.right = new FormAttachment(100, 0);
fd.bottom = new FormAttachment(100, 0);
c.setLayoutData(fd);

OS.DwmExtendFrameIntoClientArea(shell.handle, margins);

shell.open();
while (!shell.isDisposed()) {
    if (!display.readAndDispatch()) {
        display.sleep();
    }
}

This works beautifully, until you want to add a control. This results in black remaining transparent:

A follow-up post demonstrates how to do this, too, but requires modifying the SWT library. (At least, I believe so, because private SWT functions are overridden with @Override.)

How can I avoid controls becoming transparent? Even better: how can I benefit from transparency (e.g. placing images on it like so), but use it in a sensible way?

回答1:

The overridden methods are "package private". In order to override them without compile time errors, you have to put your classes into the same package as the super class, i.e. org.eclipse.swt or org.eclipse.swt.widgets package. The blog you cite post actually mentions this implementation detail at the end, so I don't know, it this really answers your question.

回答2:

Put your control beyond glass area or try to use force Background color for the control.

回答3:

You are concerned by the solution that overrides internal methods, but you are using an internal SWT class in the first place. This seems like a very hacky fragile way (at least in the current SWT implementation) to add some eye candy to your app... I hope you are not doing this in production code.

来源：https://stackoverflow.com/questions/3627683/combining-aero-glass-effects-and-swt