import PikaUI as ui
from PikaStdLib import MemChecker as mem


class MainContainer(ui.Container):
    def onclick_next(self, event):
        print('Page1: onclick_next')
        app.pageManager.enter(Page2())
        mem.now()

    def build(self):
        text = ui.Text(
            text='Hello Page1',
            align=ui.ALIGN.CENTER
        )
        btn = ui.Button(
            text='Next',
            align=ui.ALIGN.CENTER,
            pos=(0, 50),
            height=30,
            width=80,
            onclick=self.onclick_next
        )
        return [text, btn]


class Page1(ui.Page):
    def build(self):
        mainCtn = MainContainer(
            width=300,
            height=200,
            pos=(0, 50)
        )
        title = ui.Text("Title")
        return [mainCtn, title]


class Page2(ui.Page):
    def on_click_back(self, event):
        app.pageManager.back()
        mem.now()

    def build(self):
        return ui.Container(
            width=400,
            height=200,
            pos=(0, 50)
        ).add(
            ui.Text(
                text='Hello Page2',
                align=ui.ALIGN.CENTER
            ),
            ui.Button(
                text='Back',
                align=ui.ALIGN.CENTER,
                pos=(0, 50),
                height=30,
                width=80,
                onclick=self.on_click_back
            )
        )


app = ui.App()
app.pageManager.enter(Page1())
app.timer.cb(0)
mem.now()
app.pageManager.enter(Page2())
app.timer.cb(0)
mem.now()
app.pageManager.back()
app.timer.cb(0)
mem.now()


# for i in range(100):
#     app.pageManager.enter(Page2())
#     app.timer.cb(0)
#     mem.now()
#     app.pageManager.back()
#     app.timer.cb(0)
#     mem.now()