ArrowKeyMovementMethod.java 文件源码

private boolean executeDown(TextView widget, Spannable buffer, int keyCode , KeyEvent event) {
    boolean handled = false;

    if ( keyCode == KEYCODE_PAGE_UP ){
        handled |= volup(widget, buffer);
    }else if ( keyCode == KEYCODE_PAGE_DOWN){
        handled |= voldown(widget, buffer);
    }else if ( keyCode == KEYCODE_MOVE_HOME){
        handled |= movehome(widget, buffer ,event);
    }else if ( keyCode == KEYCODE_MOVE_END){
        handled |= moveend(widget, buffer , event);
    }else{
        switch (keyCode) {
        case KeyEvent.KEYCODE_DPAD_UP:
            handled |= up(widget, buffer);
            break;

        case KeyEvent.KEYCODE_DPAD_DOWN:
            handled |= down(widget, buffer);
            break;

        case KeyEvent.KEYCODE_DPAD_LEFT:
            handled |= left(widget, buffer);
            break;

        case KeyEvent.KEYCODE_DPAD_RIGHT:
            handled |= right(widget, buffer);
            break;

        case KeyEvent.KEYCODE_DPAD_CENTER:
            if (JotaTextKeyListener.getMetaStateSelecting(buffer) != 0) {
                if (widget.showContextMenu()) {
                    handled = true;
                }
            }
            break;
        case KeyEvent.KEYCODE_VOLUME_UP:
            if ( sUseVolumeKey ){
                handled |= volup(widget, buffer);
            }
            break;
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            if ( sUseVolumeKey ){
                handled |= voldown(widget, buffer);
            }
            break;
        }
    }
    if (handled) {
        MetaKeyKeyListener.adjustMetaAfterKeypress(buffer);
        resetLockedMeta(buffer);
    }

    return handled;
}