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svelte/site/content/tutorial/10-transitions/08-deferred-transitions/app-b/App.svelte

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3.3 KiB

<script>
import { quintOut } from 'svelte/easing';
import { crossfade } from 'svelte/transition';
const [send, receive] = crossfade({
duration: d => Math.sqrt(d * 200),
fallback(node, params) {
const style = getComputedStyle(node);
const transform = style.transform === 'none' ? '' : style.transform;
return {
duration: 600,
easing: quintOut,
css: t => `
transform: ${transform} scale(${t});
opacity: ${t}
`
};
}
});
let uid = 1;
let todos = [
{ id: uid++, done: false, description: 'write some docs' },
{ id: uid++, done: false, description: 'start writing blog post' },
{ id: uid++, done: true, description: 'buy some milk' },
{ id: uid++, done: false, description: 'mow the lawn' },
{ id: uid++, done: false, description: 'feed the turtle' },
{ id: uid++, done: false, description: 'fix some bugs' },
];
function add(input) {
const todo = {
id: uid++,
done: false,
description: input.value
};
todos = [todo, ...todos];
input.value = '';
}
function remove(todo) {
todos = todos.filter(t => t !== todo);
}
function mark(todo, done) {
todo.done = done;
remove(todo);
todos = todos.concat(todo);
}
</script>
<div class='board'>
<input
placeholder="what needs to be done?"
on:keydown={e => e.key === 'Enter' && add(e.target)}
>
<div class='left'>
<h2>todo</h2>
{#each todos.filter(t => !t.done) as todo (todo.id)}
<label
in:receive="{{key: todo.id}}"
out:send="{{key: todo.id}}"
>
<input type=checkbox on:change={() => mark(todo, true)}>
{todo.description}
<button on:click="{() => remove(todo)}">remove</button>
</label>
{/each}
</div>
<div class='right'>
<h2>done</h2>
{#each todos.filter(t => t.done) as todo (todo.id)}
<label
class="done"
in:receive="{{key: todo.id}}"
out:send="{{key: todo.id}}"
>
<input type=checkbox checked on:change={() => mark(todo, false)}>
{todo.description}
<button on:click="{() => remove(todo)}">remove</button>
</label>
{/each}
</div>
</div>
<style>
.board {
display: grid;
grid-template-columns: 1fr 1fr;
grid-gap: 1em;
max-width: 36em;
margin: 0 auto;
}
.board > input {
font-size: 1.4em;
grid-column: 1/3;
}
h2 {
font-size: 2em;
font-weight: 200;
user-select: none;
margin: 0 0 0.5em 0;
}
label {
position: relative;
line-height: 1.2;
padding: 0.5em 2.5em 0.5em 2em;
margin: 0 0 0.5em 0;
border-radius: 2px;
user-select: none;
border: 1px solid hsl(240, 8%, 70%);
background-color:hsl(240, 8%, 93%);
color: #333;
}
input[type="checkbox"] {
position: absolute;
left: 0.5em;
top: 0.6em;
margin: 0;
}
.done {
border: 1px solid hsl(240, 8%, 90%);
background-color:hsl(240, 8%, 98%);
}
button {
position: absolute;
top: 0;
right: 0.2em;
width: 2em;
height: 100%;
background: no-repeat 50% 50% url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23676778' d='M12,2C17.53,2 22,6.47 22,12C22,17.53 17.53,22 12,22C6.47,22 2,17.53 2,12C2,6.47 6.47,2 12,2M17,7H14.5L13.5,6H10.5L9.5,7H7V9H17V7M9,18H15A1,1 0 0,0 16,17V10H8V17A1,1 0 0,0 9,18Z'%3E%3C/path%3E%3C/svg%3E");
background-size: 1.4em 1.4em;
border: none;
opacity: 0;
transition: opacity 0.2s;
text-indent: -9999px;
cursor: pointer;
}
label:hover button {
opacity: 1;
}
</style>