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fix: horizontal scrolling back to start on load #457

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fix: horizontal scrolling back to start on load #457

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29 changes: 16 additions & 13 deletions src/MaterialTabBar/TabBar.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -100,19 +100,22 @@ const MaterialTabBar = <T extends TabName = TabName>({
if (!event.nativeEvent?.layout) return
const { width, x } = event.nativeEvent.layout

itemLayoutGathering.current.set(name, {
width,
x,
})

// pick out the layouts for the tabs we know about (in case they changed dynamically)
const layout = Array.from(itemLayoutGathering.current.entries())
.filter(([tabName]) => tabNames.includes(tabName))
.map(([, layout]) => layout)
.sort((a, b) => a.x - b.x)

if (layout.length === tabNames.length) {
setItemsLayout(layout)
// Only update if we don't already have a layout for this tab
if (!itemLayoutGathering.current.has(name)) {
itemLayoutGathering.current.set(name, {
width,
x,
})

// pick out the layouts for the tabs we know about (in case they changed dynamically)
const layout = Array.from(itemLayoutGathering.current.entries())
.filter(([tabName]) => tabNames.includes(tabName))
.map(([, layout]) => layout)
.sort((a, b) => a.x - b.x)

if (layout.length === tabNames.length) {
setItemsLayout(layout)
}
}
}
},
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