ArrowKeyMovementMethod.java 文件源码

private boolean up(TextView widget, Spannable buffer) {
        boolean cap = (MetaKeyKeyListener.getMetaState(buffer,
                        KeyEvent.META_SHIFT_ON) == 1) ||
                      (JotaTextKeyListener.getMetaStateSelecting(buffer) != 0);
        boolean alt = MetaKeyKeyListener.getMetaState(buffer,
                        KeyEvent.META_ALT_ON) == 1;
        Layout layout = widget.getLayout();

        if (cap) {
            if (alt) {
//                Selection.extendSelection(buffer, 0);
                widget.movePage(true,true);
                return true;
            } else {
                return Selection.extendUp(buffer, layout);
            }
        } else {
            if (alt) {
//                Selection.setSelection(buffer, 0);
                widget.movePage(true,false);
                return true;
            } else {
                return Selection.moveUp(buffer, layout);
            }
        }
    }