class Painted: RectBlock {
    function paint(self: Painted, mount: Mount, geometry: Bounds): DisplayList {
        return RectBlock.paint(self,mount,geometry)
    }
}
class Actions {
    count: Object
    function click(self: Actions, event: Event): Unit { self.count.increment() }
}
count = ui.state(0)
actions = Actions(count)
first = Button("顶部按钮")
middle = Button("中间按钮")
last = Button("底部按钮")
firstConnection = first.on("click",actions.click)
middleConnection = middle.on("click",actions.click)
lastConnection = last.on("click",actions.click)
body = Column(12,12,first,Painted(520,180,8,"#DCE8FF"),middle,RectBlock(520,180,8,"#E3EFE5"),last)
scroller = ScrollBlock(320,180,body)
root = Column(24,16,TextBlock("同一 Block，两处 Mount 独立滚动"),ui.textOf(count,"value"),scroller)
page = Page()
page.title = "滚动示例"
page.render(root)
other = Window()
other.setTitle("Scroll Secondary")
second = Page()
second.title = "独立滚动位置"
second.open(other)
second.render(root)
ui.window().setTitle("Scroll Primary")