fix: the position is messed up when switching DatePicker panels (#240)

thaw/src/date_picker/panel/date_panel.rs

@@ -1,8 +1,9 @@
 use super::PanelVariant;
 use crate::{Button, ButtonAppearance, ButtonSize, CalendarItemDate};
 use chrono::{Datelike, Days, Month, Months, NaiveDate};
-use leptos::prelude::*;
+use leptos::{html, prelude::*};
 use std::ops::Deref;
+use thaw_components::FollowerInjection;
 use thaw_utils::{now_date, ArcOneCallback};
 
 #[component]
@@ -12,6 +13,14 @@ pub fn DatePanel(
     close_panel: ArcOneCallback<Option<NaiveDate>>,
     panel_variant: RwSignal<PanelVariant>,
 ) -> impl IntoView {
+    let follower = FollowerInjection::expect_context();
+    let panel_ref = NodeRef::<html::Div>::new();
+    Effect::new(move || {
+        let Some(_) = panel_ref.get() else {
+            return;
+        };
+        follower.refresh_position();
+    });
     let dates = Memo::new(move |_| {
         let show_date = show_date.get();
         let show_date_month = show_date.month();
@@ -87,7 +96,7 @@ pub fn DatePanel(
         }
     };
     view! {
-        <div>
+        <div class="thaw-date-picker-date-panel" node_ref=panel_ref>
             <div class="thaw-date-picker-date-panel__calendar">
                 <div class="thaw-date-picker-date-panel__header">
                     <Button

thaw/src/date_picker/panel/month_panel.rs

@@ -1,13 +1,23 @@
 use super::PanelVariant;
 use crate::{Button, ButtonAppearance, ButtonSize};
 use chrono::{Datelike, Month, Months, NaiveDate};
-use leptos::prelude::*;
+use leptos::{html, prelude::*};
+use thaw_components::FollowerInjection;
 
 #[component]
 pub fn MonthPanel(
     date_panel_show_date: RwSignal<NaiveDate>,
     panel_variant: RwSignal<PanelVariant>,
 ) -> impl IntoView {
+    let follower = FollowerInjection::expect_context();
+    let panel_ref = NodeRef::<html::Div>::new();
+    Effect::new(move || {
+        let Some(_) = panel_ref.get() else {
+            return;
+        };
+        follower.refresh_position();
+    });
+
     let show_date = RwSignal::new(date_panel_show_date.get_untracked());
     let previous_year = move |_| {
         show_date.update(|date| {
@@ -20,7 +30,7 @@ pub fn MonthPanel(
         });
     };
     view! {
-        <div class="thaw-date-picker-month-panel">
+        <div class="thaw-date-picker-month-panel" node_ref=panel_ref>
             <div class="thaw-date-picker-month-panel__header">
                 <Button
                     appearance=ButtonAppearance::Transparent

thaw/src/date_picker/panel/year_panel.rs

@@ -1,7 +1,8 @@
 use super::PanelVariant;
 use crate::{Button, ButtonAppearance, ButtonSize};
 use chrono::{Datelike, NaiveDate};
-use leptos::prelude::*;
+use leptos::{html, prelude::*};
+use thaw_components::FollowerInjection;
 
 const MAX_YEAR: i32 = (i32::MAX >> 13) / 10 - 1;
 const MIN_YEAR: i32 = (i32::MIN >> 13) / 10 + 1;
@@ -11,6 +12,14 @@ pub fn YearPanel(
     date_panel_show_date: RwSignal<NaiveDate>,
     panel_variant: RwSignal<PanelVariant>,
 ) -> impl IntoView {
+    let follower = FollowerInjection::expect_context();
+    let panel_ref = NodeRef::<html::Div>::new();
+    Effect::new(move || {
+        let Some(_) = panel_ref.get() else {
+            return;
+        };
+        follower.refresh_position();
+    });
     let show_min_year = RwSignal::new(date_panel_show_date.get_untracked().year() / 10);
     let previous_year_range = move |_| {
         show_min_year.update(|year| {
@@ -27,7 +36,7 @@ pub fn YearPanel(
         });
     };
     view! {
-        <div>
+        <div class="thaw-date-picker-year-panel" node_ref=panel_ref>
             <div class="thaw-date-picker-year-panel__header">
                 <Button
                     appearance=ButtonAppearance::Transparent

thaw_components/src/binder/mod.rs

@@ -8,6 +8,7 @@ use web_sys::wasm_bindgen::JsCast;
 use crate::Teleport;
 use get_placement_style::{get_follower_placement_offset, FollowerPlacementOffset};
 use leptos::{
+    context::Provider,
     ev,
     html::{self, ElementType},
     leptos_dom::helpers::WindowListenerHandle,
@@ -187,23 +188,40 @@ where
         }
     });
 
-    on_cleanup(move || {
+    Owner::on_cleanup(move || {
         remove_listener();
     });
 
+    let follower_injection = FollowerInjection(Callback::new(move |_| sync_position()));
+
     view! {
         {children()}
         <Teleport immediate=follower_show>
-            <div class="thaw-binder-follower-container">
-                <div
-                    class="thaw-binder-follower-content"
-                    data-thaw-placement=move || placement_str.get()
-                    node_ref=content_ref
-                    style=move || content_style.get()
-                >
-                    {follower_children()}
+            <Provider value=follower_injection>
+                <div class="thaw-binder-follower-container">
+                    <div
+                        class="thaw-binder-follower-content"
+                        data-thaw-placement=move || placement_str.get()
+                        node_ref=content_ref
+                        style=move || content_style.get()
+                    >
+                        {follower_children()}
+                    </div>
                 </div>
-            </div>
+            </Provider>
         </Teleport>
     }
 }
+
+#[derive(Debug, Clone)]
+pub struct FollowerInjection(Callback<()>);
+
+impl FollowerInjection {
+    pub fn expect_context() -> Self {
+        expect_context()
+    }
+
+    pub fn refresh_position(&self) {
+        self.0.run(());
+    }
+}

thaw_components/src/lib.rs

@@ -5,7 +5,7 @@ mod if_comp;
 mod option_comp;
 mod teleport;
 
-pub use binder::{Binder, Follower, FollowerPlacement, FollowerWidth};
+pub use binder::{Binder, Follower, FollowerInjection, FollowerPlacement, FollowerWidth};
 pub use css_transition::CSSTransition;
 pub use focus_trap::FocusTrap;
 pub use if_comp::{ElseIf, If, Then};