Evan Almloff
d8d11db403
This PR contains just the breaking changes required for the upcoming store implementation. It adds two new primitives: Mutable mapped signals (without a different subscriber list). This lets you scope a writable value and pass it to a child component. It requires two closures to map the immutable and mutable references to the inner signal. With stores, these closures will be derived Boxed readable and writable values (ReadSignal, and WriteSignal). Any readable or writable types can be converted to a read signal or write signal with the boxed method or built in types are automatically converted into the boxed variants when passing into props * map signals mutably * boxed signals * remove mutable borrow type from boxed writable * improve map mut example * restore boxed_mut helper * make boxed readable/writable types copy * Move away from the ReadOnlySignal alias in examples * automatically convert Write * Fix some tests * ReadSignal and WriteSignal * move read only signal alias * make maps copy * store prototype * implement derive macro * Handle generics in the derive macro * Make Selector boxable * derive boxed conversion * Get rid of store type * Remove hardcoded type from derive macro * selector -> store * Refactor store implementation * more vec methods * todo mvc store example * Implement Storable for HashMap * fix write * restore sorting logic in todomvc * derive readable and writable * improve todomvc store example * Result store * Option store * collect dead subscribers * fix clippy and formatting * recognize some common foreign types automatically * fix foreign stores in props * slice and array selectors * clean up store example * remove stores * writable is child owned * fix typo * fix clippy * fix doc tests
260 lines
8.9 KiB
Rust
260 lines
8.9 KiB
Rust
//! The typical TodoMVC app, implemented in Dioxus.
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use dioxus::prelude::*;
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use std::collections::HashMap;
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const STYLE: Asset = asset!("/examples/assets/todomvc.css");
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fn main() {
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dioxus::launch(app);
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}
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#[derive(PartialEq, Eq, Clone, Copy)]
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enum FilterState {
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All,
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Active,
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Completed,
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}
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struct TodoItem {
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checked: bool,
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contents: String,
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}
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fn app() -> Element {
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// We store the todos in a HashMap in a Signal.
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// Each key is the id of the todo, and the value is the todo itself.
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let mut todos = use_signal(HashMap::<u32, TodoItem>::new);
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let filter = use_signal(|| FilterState::All);
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// We use a simple memoized signal to calculate the number of active todos.
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// Whenever the todos change, the active_todo_count will be recalculated.
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let active_todo_count =
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use_memo(move || todos.read().values().filter(|item| !item.checked).count());
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// We use a memoized signal to filter the todos based on the current filter state.
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// Whenever the todos or filter change, the filtered_todos will be recalculated.
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// Note that we're only storing the IDs of the todos, not the todos themselves.
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let filtered_todos = use_memo(move || {
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let mut filtered_todos = todos
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.read()
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.iter()
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.filter(|(_, item)| match filter() {
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FilterState::All => true,
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FilterState::Active => !item.checked,
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FilterState::Completed => item.checked,
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})
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.map(|f| *f.0)
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.collect::<Vec<_>>();
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filtered_todos.sort_unstable();
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filtered_todos
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});
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// Toggle all the todos to the opposite of the current state.
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// If all todos are checked, uncheck them all. If any are unchecked, check them all.
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let toggle_all = move |_| {
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let check = active_todo_count() != 0;
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for (_, item) in todos.write().iter_mut() {
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item.checked = check;
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}
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};
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rsx! {
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document::Link { rel: "stylesheet", href: STYLE }
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section { class: "todoapp",
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TodoHeader { todos }
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section { class: "main",
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if !todos.read().is_empty() {
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input {
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id: "toggle-all",
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class: "toggle-all",
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r#type: "checkbox",
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onchange: toggle_all,
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checked: active_todo_count() == 0
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}
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label { r#for: "toggle-all" }
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}
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// Render the todos using the filtered_todos signal
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// We pass the ID into the TodoEntry component so it can access the todo from the todos signal.
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// Since we store the todos in a signal too, we also need to send down the todo list
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ul { class: "todo-list",
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for id in filtered_todos() {
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TodoEntry { key: "{id}", id, todos }
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}
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}
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// We only show the footer if there are todos.
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if !todos.read().is_empty() {
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ListFooter { active_todo_count, todos, filter }
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}
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}
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}
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// A simple info footer
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footer { class: "info",
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p { "Double-click to edit a todo" }
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p {
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"Created by "
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a { href: "http://github.com/jkelleyrtp/", "jkelleyrtp" }
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}
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p {
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"Part of "
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a { href: "http://todomvc.com", "TodoMVC" }
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}
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}
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}
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}
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#[component]
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fn TodoHeader(mut todos: WriteSignal<HashMap<u32, TodoItem>>) -> Element {
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let mut draft = use_signal(|| "".to_string());
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let mut todo_id = use_signal(|| 0);
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let onkeydown = move |evt: KeyboardEvent| {
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if evt.key() == Key::Enter && !draft.read().is_empty() {
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let id = todo_id();
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let todo = TodoItem {
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checked: false,
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contents: draft.to_string(),
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};
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todos.write().insert(id, todo);
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todo_id += 1;
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draft.set("".to_string());
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}
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};
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rsx! {
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header { class: "header",
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h1 { "todos" }
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input {
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class: "new-todo",
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placeholder: "What needs to be done?",
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value: "{draft}",
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autofocus: "true",
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oninput: move |evt| draft.set(evt.value()),
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onkeydown
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}
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}
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}
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}
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/// A single todo entry
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/// This takes the ID of the todo and the todos signal as props
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/// We can use these together to memoize the todo contents and checked state
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#[component]
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fn TodoEntry(mut todos: WriteSignal<HashMap<u32, TodoItem>>, id: u32) -> Element {
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let mut is_editing = use_signal(|| false);
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// To avoid re-rendering this component when the todo list changes, we isolate our reads to memos
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// This way, the component will only re-render when the contents of the todo change, or when the editing state changes.
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// This does involve taking a local clone of the todo contents, but it allows us to prevent this component from re-rendering
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let checked = use_memo(move || todos.read().get(&id).unwrap().checked);
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let contents = use_memo(move || todos.read().get(&id).unwrap().contents.clone());
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rsx! {
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li {
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// Dioxus lets you use if statements in rsx to conditionally render attributes
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// These will get merged into a single class attribute
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class: if checked() { "completed" },
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class: if is_editing() { "editing" },
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// Some basic controls for the todo
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div { class: "view",
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input {
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class: "toggle",
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r#type: "checkbox",
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id: "cbg-{id}",
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checked: "{checked}",
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oninput: move |evt| todos.write().get_mut(&id).unwrap().checked = evt.checked()
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}
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label {
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r#for: "cbg-{id}",
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ondoubleclick: move |_| is_editing.set(true),
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onclick: |evt| evt.prevent_default(),
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"{contents}"
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}
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button {
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class: "destroy",
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onclick: move |evt| {
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evt.prevent_default();
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todos.write().remove(&id);
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},
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}
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}
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// Only render the actual input if we're editing
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if is_editing() {
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input {
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class: "edit",
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value: "{contents}",
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oninput: move |evt| todos.write().get_mut(&id).unwrap().contents = evt.value(),
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autofocus: "true",
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onfocusout: move |_| is_editing.set(false),
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onkeydown: move |evt| {
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match evt.key() {
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Key::Enter | Key::Escape | Key::Tab => is_editing.set(false),
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_ => {}
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}
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}
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}
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}
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}
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}
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}
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#[component]
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fn ListFooter(
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mut todos: WriteSignal<HashMap<u32, TodoItem>>,
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active_todo_count: ReadSignal<usize>,
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mut filter: WriteSignal<FilterState>,
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) -> Element {
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// We use a memoized signal to calculate whether we should show the "Clear completed" button.
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// This will recompute whenever the todos change, and if the value is true, the button will be shown.
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let show_clear_completed = use_memo(move || todos.read().values().any(|todo| todo.checked));
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rsx! {
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footer { class: "footer",
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span { class: "todo-count",
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strong { "{active_todo_count} " }
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span {
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match active_todo_count() {
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1 => "item",
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_ => "items",
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}
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" left"
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}
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}
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ul { class: "filters",
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for (state , state_text , url) in [
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(FilterState::All, "All", "#/"),
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(FilterState::Active, "Active", "#/active"),
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(FilterState::Completed, "Completed", "#/completed"),
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] {
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li {
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a {
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href: url,
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class: if filter() == state { "selected" },
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onclick: move |evt| {
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evt.prevent_default();
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filter.set(state)
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},
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{state_text}
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}
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}
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}
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}
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if show_clear_completed() {
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button {
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class: "clear-completed",
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onclick: move |_| todos.write().retain(|_, todo| !todo.checked),
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"Clear completed"
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}
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}
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}
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}
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}
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