add delect icon click listener

fix struct

fix dragable gridview bug

修复吸附效果

dragable dradview deleteicon from image to widget

丢弃不等高吸顶布局

DragAbleGridView and 吸顶布局优化

add example

Merge branch 'master' of https://github.com/OpenFlutter/PullToRefresh

remove .iml file

减少DragableGridview的参数

Optimization marquee

fix bug for marquee

add new picture

add image