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package page
import (
"log"
"time"
"gioui.org/example/component/icon"
"gioui.org/layout"
"gioui.org/op/paint"
"gioui.org/widget/material"
"gioui.org/x/component"
)
type Page interface {
Actions() []component.AppBarAction
Overflow() []component.OverflowAction
Layout(gtx layout.Context, th *material.Theme) layout.Dimensions
NavItem() component.NavItem
}
type Router struct {
pages map[interface{}]Page
current interface{}
*component.ModalNavDrawer
NavAnim component.VisibilityAnimation
*component.AppBar
*component.ModalLayer
NonModalDrawer, BottomBar bool
}
func NewRouter() Router {
modal := component.NewModal()
nav := component.NewNav("Navigation Drawer", "This is an example.")
modalNav := component.ModalNavFrom(&nav, modal)
bar := component.NewAppBar(modal)
bar.NavigationIcon = icon.MenuIcon
na := component.VisibilityAnimation{
State: component.Invisible,
Duration: time.Millisecond * 250,
}
return Router{
pages: make(map[interface{}]Page),
ModalLayer: modal,
ModalNavDrawer: modalNav,
AppBar: bar,
NavAnim: na,
}
}
func (r *Router) Register(tag interface{}, p Page) {
r.pages[tag] = p
navItem := p.NavItem()
navItem.Tag = tag
if r.current == interface{}(nil) {
r.current = tag
r.AppBar.Title = navItem.Name
r.AppBar.SetActions(p.Actions(), p.Overflow())
}
r.ModalNavDrawer.AddNavItem(navItem)
}
func (r *Router) SwitchTo(tag interface{}) {
p, ok := r.pages[tag]
if !ok {
return
}
navItem := p.NavItem()
r.current = tag
r.AppBar.Title = navItem.Name
r.AppBar.SetActions(p.Actions(), p.Overflow())
}
func (r *Router) Layout(gtx layout.Context, th *material.Theme) layout.Dimensions {
for _, event := range r.AppBar.Events(gtx) {
switch event := event.(type) {
case component.AppBarNavigationClicked:
if r.NonModalDrawer {
r.NavAnim.ToggleVisibility(gtx.Now)
} else {
r.ModalNavDrawer.Appear(gtx.Now)
r.NavAnim.Disappear(gtx.Now)
}
case component.AppBarContextMenuDismissed:
log.Printf("Context menu dismissed: %v", event)
case component.AppBarOverflowActionClicked:
log.Printf("Overflow action selected: %v", event)
}
}
if r.ModalNavDrawer.NavDestinationChanged() {
r.SwitchTo(r.ModalNavDrawer.CurrentNavDestination())
}
paint.Fill(gtx.Ops, th.Palette.Bg)
content := layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
return layout.Flex{}.Layout(gtx,
layout.Rigid(func(gtx layout.Context) layout.Dimensions {
gtx.Constraints.Max.X /= 3
return r.NavDrawer.Layout(gtx, th, &r.NavAnim)
}),
layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
return r.pages[r.current].Layout(gtx, th)
}),
)
})
bar := layout.Rigid(func(gtx layout.Context) layout.Dimensions {
return r.AppBar.Layout(gtx, th, "Menu", "Actions")
})
flex := layout.Flex{Axis: layout.Vertical}
if r.BottomBar {
flex.Layout(gtx, content, bar)
} else {
flex.Layout(gtx, bar, content)
}
r.ModalLayer.Layout(gtx, th)
return layout.Dimensions{Size: gtx.Constraints.Max}
}