Robot.java 文件源码

@SuppressWarnings("deprecation")
private static synchronized void initLegalButtonMask() {
    if (LEGAL_BUTTON_MASK != 0) return;

    int tmpMask = 0;
    if (Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled()){
        if (Toolkit.getDefaultToolkit() instanceof SunToolkit) {
            final int buttonsNumber = ((SunToolkit)(Toolkit.getDefaultToolkit())).getNumberOfButtons();
            for (int i = 0; i < buttonsNumber; i++){
                tmpMask |= InputEvent.getMaskForButton(i+1);
            }
        }
    }
    tmpMask |= InputEvent.BUTTON1_MASK|
        InputEvent.BUTTON2_MASK|
        InputEvent.BUTTON3_MASK|
        InputEvent.BUTTON1_DOWN_MASK|
        InputEvent.BUTTON2_DOWN_MASK|
        InputEvent.BUTTON3_DOWN_MASK;
    LEGAL_BUTTON_MASK = tmpMask;
}