Teact: Introduce setExtraStyles

src/components/ui/Transition.tsx

@@ -1,7 +1,9 @@
 import type { RefObject } from 'react';
 import React, { useEffect, useLayoutEffect, useRef } from '../../lib/teact/teact';
-import { addExtraClass, removeExtraClass, toggleExtraClass } from '../../lib/teact/teact-dom';
+import {
-import { requestMutation, requestForcedReflow } from '../../lib/fasterdom/fasterdom';
+  addExtraClass, removeExtraClass, setExtraStyles, toggleExtraClass,
+} from '../../lib/teact/teact-dom';
+import { requestForcedReflow, requestMutation } from '../../lib/fasterdom/fasterdom';
 
 import { getGlobal } from '../../global';
 
@@ -146,8 +148,10 @@ function Transition({
         addExtraClass(activeChild, CLASSES.active);
 
         if (isSlideOptimized) {
-          activeChild.style.transition = 'none';
+          setExtraStyles(activeChild, {
-          activeChild.style.transform = 'translate3d(0, 0, 0)';
+            transition: 'none',
+            transform: 'translate3d(0, 0, 0)',
+          });
         }
       }
 
@@ -233,8 +237,8 @@ function Transition({
 
         if (shouldRestoreHeight) {
           if (activeElement) {
-            activeElement.style.height = 'auto';
+            setExtraStyles(activeElement, { height: 'auto' });
-            container.style.height = `${clientHeight}px`;
+            setExtraStyles(container, { height: `${clientHeight}px` });
           }
         }
 
@@ -290,9 +294,11 @@ function Transition({
     }
 
     requestMutation(() => {
-      activeElement.style.height = 'auto';
+      setExtraStyles(activeElement, { height: 'auto' });
-      container.style.height = `${clientHeight}px`;
+      setExtraStyles(container, {
-      container.style.flexBasis = `${clientHeight}px`;
+        height: `${clientHeight}px`,
+        flexBasis: `${clientHeight}px`,
+      });
     });
   }, [shouldRestoreHeight, children]);
 
@@ -347,15 +353,19 @@ function performSlideOptimized(
     toggleExtraClass(container, `Transition-${name}Backwards`, isBackwards);
 
     if (fromSlide instanceof HTMLElement) {
-      fromSlide.style.transition = 'none';
-      fromSlide.style.transform = '';
       removeExtraClass(fromSlide, CLASSES.active);
+      setExtraStyles(fromSlide, {
+        transition: 'none',
+        transform: '',
+      });
     }
 
     if (toSlide instanceof HTMLElement) {
-      toSlide.style.transition = 'none';
-      toSlide.style.transform = 'translate3d(0, 0, 0)';
       addExtraClass(toSlide, CLASSES.active);
+      setExtraStyles(toSlide, {
+        transition: 'none',
+        transform: 'translate3d(0, 0, 0)',
+      });
     }
 
     cleanup();
@@ -375,13 +385,17 @@ function performSlideOptimized(
   toggleExtraClass(container, `Transition-${name}Backwards`, isBackwards);
 
   if (fromSlide instanceof HTMLElement) {
-    fromSlide.style.transition = 'none';
+    setExtraStyles(fromSlide, {
-    fromSlide.style.transform = 'translate3d(0, 0, 0)';
+      transition: 'none',
+      transform: 'translate3d(0, 0, 0)',
+    });
   }
 
   if (toSlide instanceof HTMLElement) {
-    toSlide.style.transition = 'none';
+    setExtraStyles(toSlide, {
-    toSlide.style.transform = `translate3d(${isBackwards ? '-' : ''}100%, 0, 0)`;
+      transition: 'none',
+      transform: `translate3d(${isBackwards ? '-' : ''}100%, 0, 0)`,
+    });
   }
 
   requestForcedReflow(() => {
@@ -391,15 +405,19 @@ function performSlideOptimized(
 
     return () => {
       if (fromSlide instanceof HTMLElement) {
-        fromSlide.style.transition = '';
-        fromSlide.style.transform = `translate3d(${isBackwards ? '' : '-'}100%, 0, 0)`;
         removeExtraClass(fromSlide, CLASSES.active);
+        setExtraStyles(fromSlide, {
+          transition: '',
+          transform: `translate3d(${isBackwards ? '' : '-'}100%, 0, 0)`,
+        });
       }
 
       if (toSlide instanceof HTMLElement) {
-        toSlide.style.transition = '';
-        toSlide.style.transform = 'translate3d(0, 0, 0)';
         addExtraClass(toSlide, CLASSES.active);
+        setExtraStyles(toSlide, {
+          transition: '',
+          transform: 'translate3d(0, 0, 0)',
+        });
       }
     };
   });
@@ -413,13 +431,15 @@ function performSlideOptimized(
       }
 
       if (fromSlide instanceof HTMLElement) {
-        fromSlide.style.transition = 'none';
+        setExtraStyles(fromSlide, {
-        fromSlide.style.transform = '';
+          transition: 'none',
+          transform: '',
+        });
       }
 
       if (shouldRestoreHeight && clientHeight && toSlide instanceof HTMLElement) {
-        toSlide.style.height = 'auto';
+        setExtraStyles(toSlide, { height: 'auto' });
-        container.style.height = `${clientHeight}px`;
+        setExtraStyles(container, { height: `${clientHeight}px` });
       }
 
       onStop?.();

src/lib/teact/teact-dom.ts

@@ -46,6 +46,7 @@ const INDEX_KEY_PREFIX = '__indexKey#';
 
 const headsByElement = new WeakMap<Element, VirtualDomHead>();
 const extraClasses = new WeakMap<Element, Set<string>>();
+const extraStyles = new WeakMap<Element, Record<string, string>>();
 
 // eslint-disable-next-line @typescript-eslint/naming-convention
 let DEBUG_virtualTreeSize = 1;
@@ -669,7 +670,7 @@ function setAttribute(element: HTMLElement, key: string, value: any) {
       }
     }
   } else if (key === 'style') {
-    element.style.cssText = value;
+    updateStyle(element, value);
   } else if (key === 'dangerouslySetInnerHTML') {
     // eslint-disable-next-line no-underscore-dangle
     element.innerHTML = value.__html;
@@ -688,7 +689,7 @@ function removeAttribute(element: HTMLElement, key: string, value: any) {
   } else if (key === 'value') {
     (element as HTMLInputElement).value = '';
   } else if (key === 'style') {
-    element.style.cssText = '';
+    updateStyle(element, '');
   } else if (key === 'dangerouslySetInnerHTML') {
     element.innerHTML = '';
   } else if (key.startsWith('on')) {
@@ -713,6 +714,15 @@ function updateClassName(element: HTMLElement, value: string) {
   element.className = extraArray.join(' ');
 }
 
+function updateStyle(element: HTMLElement, value: string) {
+  element.style.cssText = value;
+
+  const extraObject = extraStyles.get(element);
+  if (extraObject) {
+    applyExtraStyles(element);
+  }
+}
+
 export function addExtraClass(element: Element, className: string, forceSingle = false) {
   if (!forceSingle) {
     const classNames = className.split(' ');
@@ -780,6 +790,28 @@ export function toggleExtraClass(element: Element, className: string, force?: bo
   }
 }
 
+export function setExtraStyles(element: HTMLElement, styles: Partial<CSSStyleDeclaration> & AnyLiteral) {
+  extraStyles.set(element, styles);
+  applyExtraStyles(element);
+}
+
+function applyExtraStyles(element: HTMLElement) {
+  const standardStyles = Object.entries(extraStyles.get(element)!).reduce<Record<string, string>>(
+    (acc, [prop, value]) => {
+      if (prop.startsWith('--')) {
+        element.style.setProperty(prop, value);
+      } else {
+        acc[prop] = value;
+      }
+
+      return acc;
+    },
+    {},
+  );
+
+  Object.assign(element.style, standardStyles);
+}
+
 // eslint-disable-next-line @typescript-eslint/naming-convention
 function DEBUG_addToVirtualTreeSize($current: VirtualElementParent | VirtualDomHead) {
   DEBUG_virtualTreeSize += $current.children.length;

src/lib/teact/teact.ts

@@ -745,7 +745,12 @@ function useEffectBase(
   };
 
   function setupSignals() {
-    const cleanups = dependencies?.filter(isSignal).map((signal) => signal.subscribe(() => {
+    const cleanups = dependencies?.filter(isSignal).map((signal, i) => signal.subscribe(() => {
+      if (debugKey) {
+        // eslint-disable-next-line no-console
+        console.log(`[Teact] Effect "${debugKey}" caused by signal #${i} new value:`, signal());
+      }
+
       byCursor[cursor].schedule();
     }));