ArrowKeyMovementMethod.java 文件源码

private boolean left(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) {
            return Selection.extendToLeftEdge(buffer, layout);
        } else {
            return Selection.extendLeft(buffer, layout);
        }
    } else {
        if (alt) {
            return Selection.moveToLeftEdge(buffer, layout);
        } else {
            return Selection.moveLeft(buffer, layout);
        }
    }
}