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June 9, 2022 13:45
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Flavors of declarative UIs
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ui.New(doc.NewDocument("Todo-App"), | |
Children( | |
E(doc.NewSection("todoapp", "todoapp"), | |
Ref(&AppSection), | |
CSS("todoapp"), | |
Children( | |
E(doc.NewHeader("header", "header"), | |
CSS("header"), | |
Children( | |
E(doc.NewH1("todo", "apptitle").SetText("Todo")), | |
E(NewTodoInput("todo", "new-todo"), | |
Ref(&todosinput), | |
CSS("new-todo"), | |
), | |
), | |
), | |
E(doc.NewSection("main", "main"), | |
Ref(&MainSection), | |
CSS("main"), | |
Children( | |
E(doc.NewInput("checkbox", "toggle-all", "toggle-all"), | |
Ref(&ToggleAllInput), | |
CSS("toggle-all"), | |
Listen("click",toggleallhandler,doc.NativeEventBridge), | |
), | |
E(doc.NewLabel("toggle-all-Label", "toggle-all-label").For(ToggleAllInput.AsElement())), | |
E(NewTodosListElement("todo-list", "todo-list", doc.EnableLocalPersistence()), | |
Ref(&TodosList), | |
InitRouter(Hijack("/","all"),doc.RouterConfig), | |
), | |
), | |
), | |
E(doc.NewFooter("footer", "footer"), | |
Ref(&MainFooter), | |
CSS("footer"), | |
Children( | |
E(NewTodoCount("todo-count", "todo-count"), Ref(&TodoCount)), | |
E(NewFilterList("filters", "filters"), Ref(&FilterList)), | |
E(ClearCompleteBtn("clear-complete", "clear-complete"), | |
Ref(&ClearCompleteButton), | |
Listen("click",ClearCompleteHandler,doc.NativeEventBridge), | |
), | |
), | |
), | |
), | |
), | |
E(doc.NewFooter("infofooter", "infofooter"), | |
CSS("info"), | |
Children( | |
E(doc.NewParagraph("editinfo", "editinfo").SetText("Double-click to edit a todo")), | |
E(doc.NewParagraph("createdWith", "createdWith").SetText("Created with: "), | |
Children( | |
E(doc.NewAnchor("particleui", "particleui").SetHREF("http://github.com/atdiar/particleui").SetText("ParticleUI")), | |
), | |
), | |
), | |
), | |
), | |
) |
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ui.New( | |
doc.NewDocument("Todo-App"), | |
Modifier(), | |
E(doc.NewSection("Appsection","todoapp"), | |
Modifier(Ref(&AppSection), CSS("todoapp"),), | |
E(doc.NewHeader("mainheader","header"), | |
Modifier(CSS("header")), | |
E(doc.NewH1("todo", "apptitle").SetText("Todo"), Modifier()), | |
E(NewTodoInput("todo", "new-todo"), Modifier(Ref(&todosinput),CSS("new-todo"))), | |
), | |
E(doc.NewSection("mainsection","main"), | |
Modifier(Ref(&MainSection), CSS("main")), | |
E(doc.NewInput("checkbox", "toggle-all", "toggle-all"), | |
Modifier( | |
Ref(&ToggleAllInput), | |
CSS("toggle-all"), | |
Listen("click",toggleallhandler,doc.NativeEventBridge), | |
), | |
), | |
E(doc.NewLabel("toggle-all-Label", "toggle-all-label").For(ToggleAllInput.AsElement()),Modifier()), | |
E(NewTodosListElement("todo-list", "todo-list", doc.EnableLocalPersistence()), | |
Modifier(Ref(&TodosList), InitRouter(Hijack("/","all"),doc.RouterConfig)), | |
), | |
E(doc.NewFooter("mainfooter","footer"), | |
Modifier(Ref(&MainFooter), CSS("footer"),), | |
E(NewTodoCount("todo-count", "todo-count"),Modifier()), | |
E(Filterlist,Modifier()), | |
E(ClearCompleteBtn("clear-complete", "clear-complete"), | |
Modifier( | |
Ref(&ClearCompleteButton), | |
Listen("click",ClearCompleteHandler,doc.NativeEventBridge), | |
), | |
), | |
), | |
), | |
E(doc.NewFooter("Appfooter","infofooter"), | |
Modifier(CSS("info"),), | |
E(doc.NewParagraph("editinfo","editinfo").SetText("Double-click to edit a todo"), Modifier()), | |
E(doc.NewParagraph("createdWith,createdWith").SetText("Created with: "), | |
Modifier(), | |
E(doc.NewAnchor("particleui", "particleui").SetHREF("http://github.com/atdiar/particleui").SetText("ParticleUI"), NoModifier), | |
), | |
), | |
), | |
), Modifier(),) |
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// 1. Create a new document | |
Document := doc.NewDocument("Todo-App") | |
AppSection := doc.NewSection("todoapp", "todoapp") | |
AppFooter := doc.NewFooter("infofooter", "infofooter") | |
Document.SetChildren(AppSection, AppFooter) | |
// 2. Build AppSection | |
MainHeader := doc.NewHeader("header", "header") | |
MainSection := doc.NewSection("main", "main") | |
MainFooter := doc.NewFooter("footer", "footer") | |
AppSection.SetChildren(MainHeader, MainSection, MainFooter) | |
// 3. Build MainHeader | |
MainHeading := doc.NewH1("todo", "apptitle").SetText("Todo") | |
todosinput := NewTodoInput("todo", "new-todo") | |
MainHeader.SetChildren(MainHeading, todosinput) | |
// 4. Build MainSection | |
ToggleAllInput := doc.NewInput("checkbox", "toggle-all", "toggle-all") | |
ToggleAllInput.AsElement().AddEventListener("click", ui.NewEventHandler(func(evt ui.Event) bool { | |
togglestate, ok := ToggleAllInput.AsElement().GetData("checked") | |
if !ok { | |
ToggleAllInput.AsElement().Set("event", "toggled", ui.Bool(true)) | |
return false | |
} | |
ts := togglestate.(ui.Bool) | |
ToggleAllInput.AsElement().Set("event", "toggled", !ts) | |
return false | |
}), doc.NativeEventBridge) | |
ToggleLabel := doc.NewLabel("toggle-all-Label", "toggle-all-label").For(ToggleAllInput.AsElement()) | |
TodosList := NewTodosListElement("todo-list", "todo-list", doc.EnableLocalPersistence()) | |
todolistview, ok := TodosList.AsViewElement() | |
if !ok { | |
panic("Expected TodosList to be constructed as a ViewElement") | |
} | |
MainSection.SetChildren(ToggleAllInput, ToggleLabel, TodosList) | |
// 5. Build MainFooter | |
TodoCount := NewTodoCount("todo-count", "todo-count") | |
FilterList := NewFilterList("filters", "filters") | |
// links | |
router := ui.NewRouter("/", todolistview,doc.RouterConfig) | |
router.Hijack("/", "/all") | |
linkall := router.NewLink(todolistview, "all") | |
linkactive := router.NewLink(todolistview, "active") | |
linkcompleted := router.NewLink(todolistview, "completed") | |
allFilter := NewFilter("All", "all-filter", linkall) | |
activeFilter := NewFilter("Active", "active-filter", linkactive) | |
completedFilter := NewFilter("Completed", "completed-filter", linkcompleted) | |
FilterList.SetFilterList(allFilter, activeFilter, completedFilter) | |
ClearCompleteButton := ClearCompleteBtn("clear-complete", "clear-complete") | |
ClearCompleteButton.AsElement().AddEventListener("click", ui.NewEventHandler(func(evt ui.Event) bool { | |
ClearCompleteButton.AsElement().Set("event", "clear", ui.Bool(true)) | |
return false | |
}), doc.NativeEventBridge) | |
MainFooter.SetChildren(TodoCount, FilterList, ClearCompleteButton) | |
// 6.Build AppFooter | |
editinfo := doc.NewParagraph("editinfo", "editinfo").SetText("Double-click to edit a todo") | |
createdWith := doc.NewParagraph("createdWith", "createdWith").SetText("Created with: ").SetChildren(doc.NewAnchor("particleui", "particleui").SetHREF("http://github.com/atdiar/particleui").SetText("ParticleUI")) | |
AppFooter.SetChildren(editinfo, createdWith) | |
//css | |
doc.AddClass(AppSection.AsElement(), "todoapp") | |
doc.AddClass(AppFooter.AsElement(), "info") | |
doc.AddClass(MainHeader.AsElement(), "header") | |
doc.AddClass(MainSection.AsElement(), "main") | |
doc.AddClass(MainFooter.AsElement(), "footer") | |
doc.AddClass(todosinput.AsElement(), "new-todo") | |
doc.AddClass(ToggleAllInput.AsElement(), "toggle-all") |
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The top example is simply function composition.
E
is defined as:func(e *Element, modifiers ...func(*Element)*Element) *Element
SoChildren
is just a mere Element modifier function like CSS and Listen and whatnot. -
The middle example does not directly use function composition. Children elements are passed as argument (variadically).
The signature ofE
has becomefunc(*Element, modifiers []func(e *Element)*Element, children ...*Element) *Element
-
the bottom example is just to show how it would look if the app was designed imperatively only.
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Note: these are fully expanded tree.
In a typical application, intermediate subtrees/ components can be defined.
This should mitigate the expansion of the tree to the right due to indentation. (a few people have been critical of this on reddit)
The second example requires a slice of *Element modifying functions (Modifiers) as second argument. Hence, we use
Modifier()
to denote the absence of modifiers instead ofnil
.