关于flutter:Flutter实现左侧边栏导航

Flutter实现左侧边栏导航,点击左侧菜单右侧主动切换,左侧菜单能够实现主动居中,右侧滚动到底部持续滑可主动切换到下一页,上滑切换到上一页,左侧菜单追随切换,查看效果图:

下载地址:https://download.csdn.net/dow...

次要代码片段:
wrapController.addListener(() {

  var maxScrollExtent = wrapController.position.maxScrollExtent;  var pixels = wrapController.position.pixels;  var dis = maxScrollExtent - pixels;  // 滚动到顶部后再往上滚,主动跳到上一页  if (dis <= -100 && currentIndex < 30 - 1) {    setState(() {      currentIndex += 1;      _scrollTo(currentIndex);    });    wrapController.jumpTo(1);  }  // 滚动到底部后再往上滚,主动跳到下一页  if (dis >= maxScrollExtent + 100 && currentIndex > 0) {    setState(() {      currentIndex -= 1;      _scrollTo(currentIndex);    });  }});