fix(mobile): mobile keyboard padding (#15365)

#### PR Dependency Tree


* **PR #15365** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Improved mobile keyboard and toolbar layout handling when the keyboard
overlays or resizes app content.
- Prevented incorrect extra spacing when Android applies keyboard insets
directly.
- Updated toolbar sizing and visibility states for smoother transitions.

- **Style**
- Adjusted mobile bottom spacing to account for keyboard height, safe
areas, and toolbar height.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/widgets/keyboard-toolbar/src/keyboard-toolbar.ts

@@ -41,8 +41,6 @@ export class AffineKeyboardToolbar extends SignalWatcher(
 ) {
   static override styles = keyboardToolbarStyles;
 
-  private readonly _expanded$ = signal(false);
-
   get std() {
     return this.rootComponent.std;
   }
@@ -52,13 +50,17 @@ export class AffineKeyboardToolbar extends SignalWatcher(
   }
 
   private get panelHeight() {
-    return this._expanded$.value
-      ? `${
-          this.keyboard.staticHeight$.value !== 0
-            ? this.keyboard.staticHeight$.value
-            : 330
-        }px`
-      : this.keyboard.appTabSafeArea$.value;
+    if (this.keyboard.visible$.value) {
+      return `${this.keyboard.height$.value}px`;
+    }
+    if (this.panelOpened) {
+      return `${
+        this.keyboard.staticHeight$.value !== 0
+          ? this.keyboard.staticHeight$.value
+          : 330
+      }px`;
+    }
+    return this.keyboard.appTabSafeArea$.value;
   }
 
   /**
@@ -266,20 +268,13 @@ export class AffineKeyboardToolbar extends SignalWatcher(
     super.connectedCallback();
     this.setAttribute(RANGE_SYNC_EXCLUDE_ATTR, 'true');
 
-    // There are two cases that `_expanded$` will be true:
-    // 1. when virtual keyboard is opened, the panel need to be expanded and overlapped by the keyboard,
-    // so that the toolbar will be on the top of the keyboard.
-    // 2. the panel is opened, whether the keyboard is closed or not exists (e.g. a physical keyboard connected)
-    //
-    // There is one case that `_expanded$` will be false:
-    // 1. the panel is closed, and the keyboard is closed, the toolbar will be rendered at the bottom of the viewport
     this._disposables.add(
       effect(() => {
-        if (this.keyboard.visible$.value || this.panelOpened) {
-          this._expanded$.value = true;
-        } else {
-          this._expanded$.value = false;
-        }
+        this.toggleAttribute(
+          'data-keyboard-visible',
+          this.keyboard.visible$.value
+        );
+        this.toggleAttribute('data-panel-open', this.panelOpened);
       })
     );
 

packages/frontend/apps/android/src/app.tsx

@@ -149,6 +149,9 @@ framework.impl(VirtualKeyboardProvider, {
             // even though the `keyboardWillShow` event is still triggered.
             visible: info.keyboardHeight !== 0,
             height: info.keyboardHeight - navBarHeight,
+            // SystemBars applies the IME inset to the WebView parent, so the
+            // keyboard no longer overlaps the web content on Android.
+            overlaysContent: false,
           });
         })().catch(console.error);
       }),

packages/frontend/core/src/blocksuite/view-extensions/mobile/keyboard-toolbar-extension.ts

@@ -45,15 +45,19 @@ export function KeyboardToolbarExtension(
 
     override mounted() {
       this._disposables.add(
-        affineVirtualKeyboardProvider.onChange(({ visible, height }) => {
-          batch(() => {
-            if (visible && this.staticHeight$.peek() !== height) {
-              this.staticHeight$.value = height;
-            }
-            this.visible$.value = visible;
-            this.height$.value = height;
-          });
-        })
+        affineVirtualKeyboardProvider.onChange(
+          ({ visible, height, overlaysContent }) => {
+            const layoutHeight = overlaysContent === false ? 0 : height;
+
+            batch(() => {
+              if (visible && this.staticHeight$.peek() !== height) {
+                this.staticHeight$.value = height;
+              }
+              this.visible$.value = visible;
+              this.height$.value = layoutHeight;
+            });
+          }
+        )
       );
     }
 

packages/frontend/core/src/mobile/modules/virtual-keyboard/providers/virtual-keyboard.ts

@@ -3,6 +3,7 @@ import { createIdentifier } from '@toeverything/infra';
 interface VirtualKeyboardInfo {
   visible: boolean;
   height: number;
+  overlaysContent?: boolean;
 }
 
 type VirtualKeyboardAction = {

packages/frontend/core/src/mobile/modules/virtual-keyboard/services/virtual-keyboard.ts

@@ -20,8 +20,10 @@ export class VirtualKeyboardService extends Service {
   private _observe() {
     this.disposables.push(
       this.virtualKeyboardProvider.onChange(info => {
+        const layoutHeight = info.overlaysContent === false ? 0 : info.height;
+
         this.visible$.next(info.visible);
-        this.height$.next(info.height);
+        this.height$.next(layoutHeight);
 
         setElementVars(document.body, {
           [globalVars.appKeyboardHeight]: `${this.height$.value}px`,

packages/frontend/core/src/mobile/styles/mobile.css.ts

@@ -22,6 +22,12 @@ globalStyle('body:has(>#app-tabs):not(:has(affine-keyboard-toolbar))', {
   paddingBottom: globalVars.appTabSafeArea,
 });
 globalStyle('body:has(affine-keyboard-toolbar)', {
+  paddingBottom: `calc(${globalVars.appTabSafeArea} + 46px)`,
+});
+globalStyle('body:has(affine-keyboard-toolbar[data-keyboard-visible])', {
+  paddingBottom: `calc(${globalVars.appKeyboardHeight} + 46px)`,
+});
+globalStyle('body:has(affine-keyboard-toolbar[data-panel-open])', {
   paddingBottom: `calc(${globalVars.appKeyboardStaticHeight} + 46px)`,
 });
 globalStyle('body:has(>#app-tabs) edgeless-toolbar-widget', {