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eg-list.go
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eg-list.go
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package main
import (
"fmt"
"github.com/gabstv/go-app/v9/pkg/app"
)
type food struct {
id int
label string
}
type foodList struct {
app.Compo
foods []food
}
func newFoodList() *foodList {
return &foodList{}
}
func (l *foodList) OnMount(ctx app.Context) {
l.initFood(ctx)
}
func (l *foodList) initFood(ctx app.Context) {
l.foods = []food{
{
id: 1,
label: "French fries",
},
{
id: 2,
label: "Pasta",
},
{
id: 3,
label: "Rice",
},
{
id: 4,
label: "Steak",
},
{
id: 5,
label: "Fish",
},
}
}
func (l *foodList) Render() app.UI {
return app.Div().Body(
app.H1().Text("Dealing with List"),
app.P().
Class("center-content").
Body(
app.Range(l.foods).Slice(func(i int) app.UI {
f := l.foods[i]
return app.Div().
Class("button").
Text("Remove "+f.label).
// The eat() function is removing the clicked element.
//
// When updating the list of children, event handlers are
// updated if they have a different pointer address. In that
// case, the eat function() address will always be the same.
//
// Here, a scope is given to the event handler to
// prevent reusing the former event handler that is
// associated with a deleted element.
OnClick(l.eat(f), f.id)
}),
),
app.P().
Class("center-content").
Body(
app.Span().
Class("button").
Text("Reset").
OnClick(l.reset),
),
)
}
func (l *foodList) eat(f food) app.EventHandler {
return func(ctx app.Context, e app.Event) {
for i, fi := range l.foods {
if fi.id == f.id {
// Removing food item:
copy(l.foods[i:], l.foods[i+1:])
l.foods = l.foods[:len(l.foods)-1]
return
}
}
}
}
func (l *foodList) reset(ctx app.Context, e app.Event) {
l.initFood(ctx)
}
// This will be replaced later by Go 1.16 embed once it will be more widely s
// upported.
var egListCode = fmt.Sprintf("```go\n%s\n```", `
package main
import (
"fmt"
"github.com/gabstv/go-app/v9/pkg/app"
)
type food struct {
id int
label string
}
type foodList struct {
app.Compo
foods []food
}
func newFoodList() *foodList {
return &foodList{}
}
func (l *foodList) OnMount(ctx app.Context) {
l.initFood(ctx)
}
func (l *foodList) initFood(ctx app.Context) {
l.foods = []food{
{
id: 1,
label: "French fries",
},
{
id: 2,
label: "Pasta",
},
{
id: 3,
label: "Rice",
},
{
id: 4,
label: "Steak",
},
{
id: 5,
label: "Fish",
},
}
}
func (l *foodList) Render() app.UI {
return app.Div().Body(
app.H1().Text("Dealing with List"),
app.P().
Class("center-content").
Body(
app.Range(l.foods).Slice(func(i int) app.UI {
f := l.foods[i]
return app.Div().
Class("button").
Text("Remove "+f.label).
// The eat() function is removing the clicked element.
//
// When updating the list of children, event handlers are
// updated if they have a different pointer address. In that
// case, the eat function() address will always be the same.
//
// Here, a scope is given to the event handler to
// prevent reusing the former event handler that is
// associated with a deleted element.
OnClick(l.eat(f), f.id)
}),
),
app.P().
Class("center-content").
Body(
app.Span().
Class("button").
Text("Reset").
OnClick(l.reset),
),
)
}
func (l *foodList) eat(f food) app.EventHandler {
return func(ctx app.Context, e app.Event) {
for i, fi := range l.foods {
if fi.id == f.id {
// Removing food item:
copy(l.foods[i:], l.foods[i+1:])
l.foods = l.foods[:len(l.foods)-1]
return
}
}
}
}
func (l *foodList) reset(ctx app.Context, e app.Event) {
l.initFood(ctx)
}
`)