- support flutter 2.0, upgrade dart to 2.10.0
- support flutter 1.12.
- remove deprecated child and window, use buttonBuilder and windowBuilder instead.
- remove unused code
- Support custom window show not only when button click. You can call PopupWindowButton.of(context).showPopupWindow() in button builder.
- deprecated child and window, next version will remove them and use buttonBuilder and windowBuilder instead.
- Add show and dismiss callback
- Support custom animation
- improve animation of window
- modify readme
- Initial experimentation