ArrowKeyMovementMethod.java 文件源码

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

    boolean ctrl = (event.getMetaState() & mShortcutCtrlKey)!=0;

    if ( ctrl ){
        if (cap) {
            Selection.extendSelection(buffer, 0);
            return true;
        } else {
            Selection.setSelection(buffer, 0);
            return true;
        }
    }else{
        if (cap) {
            return Selection.extendToLeftEdge(buffer, layout);
        } else {
            return Selection.moveToLeftEdge(buffer, layout);
        }
    }
}