CompositeCommand.java 文件源码

private void initRegisteredCommandsListener() {
    this.registeredCommands.addListener((ListChangeListener<Command>) c -> {
        while (c.next()) {
            if (registeredCommands.isEmpty()) {
                executable.unbind();
                running.unbind();
                progress.unbind();
            } else {
                BooleanBinding executableBinding = constantOf(true);
                BooleanBinding runningBinding = constantOf(false);

                for (Command registeredCommand : registeredCommands) {
                    ReadOnlyBooleanProperty currentExecutable = registeredCommand.executableProperty();
                    ReadOnlyBooleanProperty currentRunning = registeredCommand.runningProperty();
                    executableBinding = executableBinding.and(currentExecutable);
                    runningBinding = runningBinding.or(currentRunning);
                }
                executable.bind(executableBinding);
                running.bind(runningBinding);

                initProgressBinding();
            }
        }
    });
}