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flow.go
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flow.go
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package ui
import (
"fmt"
"github.com/google/uuid"
"github.com/maxence-charriere/go-app/v10/pkg/app"
)
// IFlow is the interface that describes a container that displays its items as
// a flow.
type IFlow interface {
app.UI
// Sets the ID.
ID(v string) IFlow
// Sets the class. Multiple classes can be defined by successive calls.
Class(v string) IFlow
// Sets the width in px for the content items.
// Default is 300px.
ItemWidth(px int) IFlow
// Sets the space between content elements in px.
Spacing(px int) IFlow
// Makes the items occupy all the available space when the content has only
// one row.
StretchItems() IFlow
// Sets the content.
Content(elems ...app.UI) IFlow
}
// Flow creates a container that displays its items as a flow.
func Flow() IFlow {
return &flow{
IitemWidth: 300,
id: "goapp-flow-" + uuid.NewString(),
itemsPerRow: 1,
}
}
type flow struct {
app.Compo
Iid string
Iclass string
IitemWidth int
Ispacing int
IstretchItems bool
Icontent []app.UI
id string
itemsPerRow int
itemWidth float64
}
func (f *flow) ID(v string) IFlow {
f.Iid = v
return f
}
func (f *flow) Class(v string) IFlow {
f.Iclass = app.AppendClass(f.Iclass, v)
return f
}
func (f *flow) ItemWidth(px int) IFlow {
if px > 0 {
f.IitemWidth = px
}
return f
}
func (f *flow) Spacing(px int) IFlow {
if px > 0 {
f.Ispacing = px
}
return f
}
func (f *flow) StretchItems() IFlow {
f.IstretchItems = true
return f
}
func (f *flow) Content(elems ...app.UI) IFlow {
f.Icontent = app.FilterUIElems(elems...)
return f
}
func (f *flow) OnPreRender(ctx app.Context) {
f.refresh(ctx)
}
func (f *flow) OnMount(ctx app.Context) {
f.refresh(ctx)
}
func (f *flow) OnResize(ctx app.Context) {
f.refresh(ctx)
}
func (f *flow) OnUpdate(ctx app.Context) {
f.refresh(ctx)
}
func (f *flow) Render() app.UI {
return app.Div().
DataSet("goapp-ui", "flow").
ID(f.Iid).
Class(f.Iclass).
Body(
app.Div().
ID(f.id).
Style("display", "flex").
Style("flex-wrap", "wrap").
Style("width", "100%").
Style("max-width", "100%").
Body(
app.Range(f.Icontent).Slice(func(i int) app.UI {
marginTop := "0"
if i >= f.itemsPerRow {
marginTop = pxToString(f.Ispacing)
}
marginLeft := "0"
if i%f.itemsPerRow != 0 {
marginLeft = pxToString(f.Ispacing)
}
width := fmt.Sprintf("%.6fpx", f.itemWidth)
return app.Div().
Style("position", "relative").
Style("flex-shrink", "0").
Style("flex-basis", width).
Style("max-width", width).
Style("margin-top", marginTop).
Style("margin-left", marginLeft).
Body(f.Icontent[i])
}),
),
)
}
func (f *flow) refresh(ctx app.Context) {
w, _ := f.layoutSize()
w += f.Ispacing
itemWidth := f.IitemWidth + f.Ispacing
itemsPerRow := w / itemWidth
if f.IstretchItems && len(f.Icontent) < itemsPerRow {
itemsPerRow = len(f.Icontent)
}
if itemsPerRow == 0 {
itemsPerRow = 1
}
itemWidthFloat := float64(w-f.Ispacing*itemsPerRow) / float64(itemsPerRow)
if itemsPerRow != f.itemsPerRow || itemWidthFloat != f.itemWidth {
f.itemsPerRow = itemsPerRow
f.itemWidth = itemWidthFloat
// ctx.Defer(func(app.Context) {
// f.ResizeContent()
// })
ctx.ResizeContent()
}
}
func (f *flow) layoutSize() (int, int) {
layout := app.Window().GetElementByID(f.id)
if !layout.Truthy() {
return 320 - 24 - 24, 568
}
return layout.Get("clientWidth").Int(), layout.Get("clientHeight").Int()
}