Feat/css transition (#75)

* feat: add CSSTransition component

* fix: CSSTransition transitionend

* feat: collapse item style

* fix: CSSTransition display

thaw/src/collapse/collapse.css

@@ -27,3 +27,29 @@
 .thaw-collapse-item__content {
     padding-top: 16px;
 }
+
+.thaw-collapse-item-enter-from,
+.thaw-collapse-item-enter-to {
+    opacity: 1;
+}
+
+.thaw-collapse-item-leave-to,
+.thaw-collapse-item-enter-from {
+    opacity: 0;
+    padding-top: 0;
+    max-height: 0;
+}
+
+.thaw-collapse-item-leave-active {
+    overflow: hidden;
+    transition: max-height 0.15s cubic-bezier(0.4, 0, 0.2, 1) 0s,
+        opacity 0.15s cubic-bezier(0, 0, 0.2, 1) 0s,
+        padding-top 0.15s cubic-bezier(0.4, 0, 0.2, 1) 0s;
+}
+
+.thaw-collapse-item-enter-active {
+    overflow: hidden;
+    transition: max-height 0.15s cubic-bezier(0.4, 0, 0.2, 1),
+        opacity 0.15s cubic-bezier(0.4, 0, 1, 1),
+        padding-top 0.15s cubic-bezier(0.4, 0, 0.2, 1);
+}

thaw/src/collapse/collapse_item.rs

@@ -1,5 +1,6 @@
 use super::use_collapse;
 use crate::{
+    components::CSSTransition,
     utils::{class_list::class_list, StoredMaybeSignal},
     Icon,
 };
@@ -15,6 +16,8 @@ pub fn CollapseItem(
 ) -> impl IntoView {
     let collapse = use_collapse();
     let key: StoredMaybeSignal<_> = key.into();
+    let content_ref = create_node_ref::<html::Div>();
+
     let is_show_content = create_memo(move |_| {
         collapse.value.with(|keys| {
             if key.with(|key| keys.contains(key)) {
@@ -48,12 +51,15 @@ pub fn CollapseItem(
                 <Icon icon=Icon::from(AiIcon::AiRightOutlined) class="thaw-collapse-item-arrow"/>
                 {move || title.get()}
             </div>
+            <CSSTransition node_ref=content_ref show=is_show_content name="thaw-collapse-item" let:display>
                 <div
                     class="thaw-collapse-item__content"
-                style=move || (!is_show_content.get()).then_some("display: none;")
+                    ref=content_ref
+                    style=move || display.get()
                 >
                     {children()}
                 </div>
+            </CSSTransition>
         </div>
     }
 }

thaw/src/components/css_transition/mod.rs

@@ -0,0 +1,95 @@
+use leptos::{html::ElementDescriptor, *};
+use std::ops::Deref;
+
+#[component]
+pub fn CSSTransition<T, CF, IV>(
+    node_ref: NodeRef<T>,
+    #[prop(into)] show: MaybeSignal<bool>,
+    #[prop(into)] name: MaybeSignal<String>,
+    children: CF,
+) -> impl IntoView
+where
+    T: ElementDescriptor + Clone + 'static,
+    CF: FnOnce(ReadSignal<Option<&'static str>>) -> IV + 'static,
+    IV: IntoView,
+{
+    let display = create_rw_signal((!show.get_untracked()).then_some("display: none;"));
+    let remove_class_name = store_value(None::<RemoveClassName>);
+
+    node_ref.on_load(move |node_el| {
+        let el = node_el.clone().into_any();
+        let el = el.deref();
+        let class_list = el.class_list();
+        let remove_class = Callback::new(move |_| {
+            remove_class_name.update_value(|class| {
+                if let Some(class) = class.take() {
+                    match class {
+                        RemoveClassName::Enter(active, to) => {
+                            let _ = class_list.remove_2(&active, &to);
+                        }
+                        RemoveClassName::Leave(active, to) => {
+                            let _ = class_list.remove_2(&active, &to);
+                            display.set(Some("display: none;"));
+                        }
+                    }
+                }
+            });
+        });
+
+        let _ = node_el
+            .on(ev::transitionend, move |_| {
+                remove_class.call(());
+            })
+            .on(ev::animationend, move |_| {
+                remove_class.call(());
+            });
+    });
+
+    create_render_effect(move |prev: Option<bool>| {
+        let show = show.get();
+        if let Some(node_el) = node_ref.get_untracked() {
+            if let Some(prev) = prev {
+                let name = name.get_untracked();
+
+                let el = node_el.into_any();
+                let el = el.deref();
+                let class_list = el.class_list();
+
+                if show && !prev {
+                    let enter_from = format!("{name}-enter-from");
+                    let enter_active = format!("{name}-enter-active");
+                    let enter_to = format!("{name}-enter-to");
+
+                    let _ = class_list.add_2(&enter_from, &enter_active);
+                    display.set(None);
+                    request_animation_frame(move || {
+                        let _ = class_list.remove_1(&enter_from);
+                        let _ = class_list.add_1(&enter_to);
+                        remove_class_name
+                            .set_value(Some(RemoveClassName::Enter(enter_active, enter_to)));
+                    });
+                } else if !show && prev {
+                    let leave_from = format!("{name}-leave-from");
+                    let leave_active = format!("{name}-leave-active");
+                    let leave_to = format!("{name}-leave-to");
+
+                    let _ = class_list.add_2(&leave_from, &leave_active);
+                    request_animation_frame(move || {
+                        let _ = class_list.remove_1(&leave_from);
+                        let _ = class_list.add_1(&leave_to);
+                        remove_class_name
+                            .set_value(Some(RemoveClassName::Leave(leave_active, leave_to)));
+                    });
+                }
+            }
+        }
+        show
+    });
+
+    children(display.read_only())
+}
+
+enum RemoveClassName {
+    Enter(String, String),
+    Leave(String, String),
+}

thaw/src/components/mod.rs

@@ -1,10 +1,12 @@
 mod binder;
+mod css_transition;
 mod if_comp;
 mod option_comp;
 mod teleport;
 mod wave;
 
 pub(crate) use binder::*;
+pub(crate) use css_transition::CSSTransition;
 pub(crate) use if_comp::*;
 use leptos::*;
 pub(crate) use option_comp::*;