From 9303e9c3ab5af9f399420670e8afe349aa4d0b5d Mon Sep 17 00:00:00 2001
From: mertsincan <sincan.mert@gmail.com>
Date: Tue, 16 Apr 2024 11:15:21 +0100
Subject: [PATCH] Theming API: Added `theme:load` and
 `theme:[data-primevue-style-id]:load` emits to ThemeService

---
 components/lib/base/style/BaseStyle.js |  4 +++-
 components/lib/themes/config/index.js  | 15 +++++++++++++++
 components/lib/usestyle/UseStyle.js    | 21 ++++++++++++++++++---
 3 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/components/lib/base/style/BaseStyle.js b/components/lib/base/style/BaseStyle.js
index bbe464b06..9cf0b907e 100644
--- a/components/lib/base/style/BaseStyle.js
+++ b/components/lib/base/style/BaseStyle.js
@@ -40,7 +40,9 @@ export default {
         return css ? useStyle(ObjectUtils.minifyCSS(css), { name: this.name, ...options }) : {};
     },
     loadTheme(theme, options = {}) {
-        return theme ? useStyle(ObjectUtils.minifyCSS(theme), { name: this.name, ...options }) : {};
+        const callbacks = { onMounted: (name) => Theme.onStyleMounted(name), onUpdated: (name) => Theme.onStyleUpdated(name), onLoad: (event, options) => Theme.onStyleLoaded(event, options) };
+
+        return theme ? useStyle(ObjectUtils.minifyCSS(theme), { name: this.name, ...options, ...callbacks }) : {};
     },
     getCommonThemeCSS(params) {
         return Theme.getCommonCSS(this.name, params);
diff --git a/components/lib/themes/config/index.js b/components/lib/themes/config/index.js
index cdc57919f..d888e3ca9 100644
--- a/components/lib/themes/config/index.js
+++ b/components/lib/themes/config/index.js
@@ -16,6 +16,7 @@ export default {
     _theme: undefined,
     _layerNames: new Set(),
     _loadedStyleNames: new Set(),
+    _loadingStyles: new Set(),
     _tokens: {},
     update(newValues = {}) {
         const { theme } = newValues;
@@ -121,5 +122,19 @@ export default {
     },
     getStyleSheet(name, params, props = {}) {
         return ThemeUtils.getStyleSheet({ name, theme: this.theme, params, props, defaults: this.defaults, set: { layerNames: this.setLayerNames.bind(this) } });
+    },
+    onStyleMounted(name) {
+        this._loadingStyles.add(name);
+    },
+    onStyleUpdated(name) {
+        this._loadingStyles.add(name);
+    },
+    onStyleLoaded(event, { name }) {
+        if (this._loadingStyles.size) {
+            this._loadingStyles.delete(name);
+
+            ThemeService.emit(`theme:${name}:load`, event); // Exp: ThemeService.emit('theme:panel-style:load', event)
+            !this._loadingStyles.size && ThemeService.emit('theme:load');
+        }
     }
 };
diff --git a/components/lib/usestyle/UseStyle.js b/components/lib/usestyle/UseStyle.js
index 625a0ae7d..6907be85c 100644
--- a/components/lib/usestyle/UseStyle.js
+++ b/components/lib/usestyle/UseStyle.js
@@ -19,7 +19,20 @@ export function useStyle(css, options = {}) {
     const styleRef = ref(null);
 
     const defaultDocument = DomHandler.isClient() ? window.document : undefined;
-    const { document = defaultDocument, immediate = true, manual = false, name = `style_${++_id}`, id = undefined, media = undefined, nonce = undefined, first = false, onLoad = undefined, props = {} } = options;
+    const {
+        document = defaultDocument,
+        immediate = true,
+        manual = false,
+        name = `style_${++_id}`,
+        id = undefined,
+        media = undefined,
+        nonce = undefined,
+        first = false,
+        onMounted: onStyleMounted = undefined,
+        onUpdated: onStyleUpdated = undefined,
+        onLoad: onStyleLoaded = undefined,
+        props = {}
+    } = options;
 
     let stop = () => {};
 
@@ -42,9 +55,10 @@ export function useStyle(css, options = {}) {
                 nonce: _nonce
             });
             first ? document.head.prepend(styleRef.value) : document.head.appendChild(styleRef.value);
-            DomHandler.setAttribute(styleRef.value, 'data-primevue-style-id', name);
+            DomHandler.setAttribute(styleRef.value, 'data-primevue-style-id', _name);
             DomHandler.setAttributes(styleRef.value, _styleProps);
-            styleRef.value.onload = onLoad;
+            styleRef.value.onload = (event) => onStyleLoaded?.(event, { name: _name });
+            onStyleMounted?.(_name);
         }
 
         if (isLoaded.value) return;
@@ -53,6 +67,7 @@ export function useStyle(css, options = {}) {
             cssRef,
             (value) => {
                 styleRef.value.textContent = value;
+                onStyleUpdated?.(_name);
             },
             { immediate: true }
         );