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[Fabric] Implement maxFontSizeMultiplier in Text Input #14639

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[Fabric] Implement maxFontSizeMultiplier in Text Input #14639

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5ec4be1
[Fabric] Implement maxFontSizeMultiplier in Text Input
anupriya13 May 6, 2025
2e026c2
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anupriya13 May 6, 2025
90e972c
Merge branch 'main' into user/anuverma/textinputmaxfontsize
anupriya13 May 14, 2025
4ab9dc1
Update files as per latest integration
anupriya13 May 14, 2025
50310f0
Merge branch 'main' into user/anuverma/textinputmaxfontsize
jonthysell May 15, 2025
612d56c
Merge branch 'main' into user/anuverma/textinputmaxfontsize
anupriya13 May 22, 2025
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7 changes: 7 additions & 0 deletions change/react-native-windows-595c068c-640d-4645-a3e4-d6d23bf99c79.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
{
"type": "prerelease",
"comment": "[Fabric] Implement maxFontSizeMultiplier in Text Input",
"packageName": "react-native-windows",
"email": "54227869+anupriya13@users.noreply.github.com",
"dependentChangeType": "patch"
}
13 changes: 11 additions & 2 deletions vnext/Microsoft.ReactNative/Fabric/Composition/TextInput/WindowsTextInputComponentView.cpp
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Expand Up @@ -1051,7 +1051,10 @@ void WindowsTextInputComponentView::updateProps(
oldTextInputProps.textAttributes.fontWeight != newTextInputProps.textAttributes.fontWeight ||
!facebook::react::floatEquality(
oldTextInputProps.textAttributes.letterSpacing, newTextInputProps.textAttributes.letterSpacing) ||
oldTextInputProps.textAttributes.fontFamily != newTextInputProps.textAttributes.fontFamily) {
oldTextInputProps.textAttributes.fontFamily != newTextInputProps.textAttributes.fontFamily ||
!facebook::react::floatEquality(
oldTextInputProps.textAttributes.maxFontSizeMultiplier,
newTextInputProps.textAttributes.maxFontSizeMultiplier)) {
m_propBitsMask |= TXTBIT_CHARFORMATCHANGE;
m_propBits |= TXTBIT_CHARFORMATCHANGE;
}
Expand Down Expand Up @@ -1351,9 +1354,15 @@ void WindowsTextInputComponentView::UpdateCharFormat() noexcept {

// set font size -- 15 to convert twips to pt
const auto &props = windowsTextInputProps();
float fontSize = m_fontSizeMultiplier *
float fontSize =
(std::isnan(props.textAttributes.fontSize) ? facebook::react::TextAttributes::defaultTextAttributes().fontSize
: props.textAttributes.fontSize);

// Apply maxFontSizeMultiplier if specified
auto maxFontSizeMultiplier = windowsTextInputProps().textAttributes.maxFontSizeMultiplier;
fontSize *=
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This presumably changes the size that the text actually renders with. Is this accounted for in the layout? -- Basically I think TextLayoutManager needs to also account for this property to correctly calculate the layout of this text.

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Oh i see. Thats part of the other PR.
Dont we need to get the font size from the layout? How do we get get the actual font size that the layout determined was appropriate?

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With Text we reuse the same TextLayout object that was modified by TextLayoutManager. For TextInput, I think we'd have to extract the size that was calculated from the TextLayout (or otherwise get it from the TextLayoutManager), so that we can set it on the CHARFORMAT?

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I referred to Android / IOS implementations. Let me get back on this tomorrow.

(maxFontSizeMultiplier >= 1.0f) ? std::min(maxFontSizeMultiplier, m_fontSizeMultiplier) : m_fontSizeMultiplier;

// TODO get fontSize from props.textAttributes, or defaultTextAttributes, or fragment?
cfNew.dwMask |= CFM_SIZE;
cfNew.yHeight = static_cast<LONG>(fontSize * 15);
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