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fix(mobile): split CJK keyboard positioning by device size

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Phones use translateY(-keyboardOffset) — CSS bottom is relative to layout
viewport and keyboardOffset reliably lifts it above the keyboard (iOS
doesn't auto-scroll the visual viewport for the CJK textarea on phones).

iPad uses direct bottom positioning from keyboard height — translateY
broke because iOS auto-scrolls the visual viewport when the CJK textarea
receives focus, making keyboardOffset approach 0.
This commit is contained in:
Teigen
2026-06-17 23:40:04 +08:00
parent c55af9ec39
commit cd7d8c7329
1 changed files with 19 additions and 8 deletions
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src/web/public/mobile-handlers.js
+19 -8
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@@ -326,15 +326,26 @@ const KeyboardHandler = {
}
}
// CJK textarea: position on ALL touch devices (it's always position:fixed).
// Uses keyboard HEIGHT directly — independent of visualViewport.offsetTop
// which iOS adjusts when the CJK textarea receives focus/dictation.
// CJK textarea positioning (always position:fixed on touch devices).
if (cjkInput?.classList.contains('cjk-input-visible') && keyboardHeight > 0) {
// On phones, sit above toolbar+accessory (84px). On tablets in normal
// flow, the toolbar/accessory are in-flow so use a smaller offset.
const bottomOffset = isSmallMedium ? 84 : 44;
cjkInput.style.bottom = `${keyboardHeight + bottomOffset}px`;
cjkInput.style.transform = '';
if (isSmallMedium) {
// Phones: use translateY like toolbar/accessory bar. The CSS bottom
// (84px) is relative to the layout viewport; translateY lifts it
// above the keyboard. This works on phones where iOS doesn't
// auto-scroll the visual viewport for the CJK textarea.
const layoutHeight = window.innerHeight;
const visualBottom = window.visualViewport.offsetTop + window.visualViewport.height;
const keyboardOffset = Math.max(0, layoutHeight - visualBottom);
cjkInput.style.transform = keyboardOffset > 0 ? `translateY(${-keyboardOffset}px)` : '';
cjkInput.style.bottom = '';
} else {
// iPad: use direct bottom positioning from keyboard height.
// translateY breaks on iPad because iOS auto-scrolls the visual
// viewport when the CJK textarea receives focus, making
// keyboardOffset unreliable (approaches 0).
cjkInput.style.bottom = `${keyboardHeight + 44}px`;
cjkInput.style.transform = '';
}
}
} else {
this.resetLayout();