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feat(windows): let a parent resolve its children's percentage sizes by triniwiz · Pull Request #11468 · NativeScript/NativeScript · GitHub
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feat(windows): let a parent resolve its children's percentage sizes #11468

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feat(windows): let a parent resolve its children's percentage sizes #11468

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7d0adce
feat(windows): let a parent resolve its children's percentage sizes
triniwiz Sep 28, 2026
68ab1fa
Merge branch 'feat/windows' into fix/windows-parent-percent-sizing
triniwiz Sep 30, 2026
6b21744
Merge branch 'feat/windows' into fix/windows-parent-percent-sizing
triniwiz Oct 5, 2026
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6 changes: 6 additions & 0 deletions packages/core/ui/core/view/index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -991,6 +991,12 @@ export abstract class View extends ViewCommon {
*/
hasGestureObservers?(): boolean;

/**
* Windows only. A parent that lays out its children itself can take over a child's percentage
* width or height (`fraction` 0-1, `null` once it is no longer a percentage) by returning `true`.
*/
_setChildPercentSize?(child: View, horizontal: boolean, fraction: number | null): boolean;

/**
* Android only to set the touch listener
*/
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21 changes: 21 additions & 0 deletions packages/core/ui/core/view/index.windows.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1476,6 +1476,15 @@ export class View extends ViewCommon {
} catch (_e) { }
}

/**
* A parent that lays out its children itself can take over a child's percentage width or height
* (`fraction` 0-1, `null` once it is no longer a percentage) by returning `true`: the child then
* leaves its XAML size unset and skips its own percent sizing.
*/
_setChildPercentSize(child: View, horizontal: boolean, fraction: number | null): boolean {
return false;
}

private _applyPercentSizing(): void {
const nativeView = this.nativeViewProtected as any;
if (!nativeView) {
Expand Down Expand Up @@ -1521,6 +1530,11 @@ export class View extends ViewCommon {

if (value && typeof value === 'object' && (value as any).unit === '%') {
const pct = (value as any).value;
if (this.parent instanceof View && this.parent._setChildPercentSize(this, true, pct)) {
this._percentWidth = null;
this.nativeViewProtected.Width = NaN;
return;
}
this._percentWidth = pct;
this._ensureSizeWatch(); // re-apply percent when the parent resizes
this.nativeViewProtected.Width = NaN;
Expand All @@ -1543,6 +1557,7 @@ export class View extends ViewCommon {
}

this._percentWidth = null;
if (this.parent instanceof View) this.parent._setChildPercentSize(this, true, null);
// Clear any previously set flex-basis so the C++ widget falls back to DesiredSize.
try {
(NativeScript as any).Widgets.FlexboxLayout.SetFlexBasisPercent(
Expand All @@ -1560,6 +1575,11 @@ export class View extends ViewCommon {

if (value && typeof value === 'object' && (value as any).unit === '%') {
const pct = (value as any).value;
if (this.parent instanceof View && this.parent._setChildPercentSize(this, false, pct)) {
this._percentHeight = null;
this.nativeViewProtected.Height = NaN;
return;
}
this._percentHeight = pct;
this._ensureSizeWatch(); // re-apply percent when the parent resizes
this.nativeViewProtected.Height = NaN;
Expand All @@ -1577,6 +1597,7 @@ export class View extends ViewCommon {
}

this._percentHeight = null;
if (this.parent instanceof View) this.parent._setChildPercentSize(this, false, null);
this.nativeViewProtected.Height = toXamlLength(value);
}

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