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fix(core): detach SegmentedBar/TabView items from a previous parent before adopting them by edusperoni · Pull Request #11353 · NativeScript/NativeScript · GitHub

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fix(core): detach SegmentedBar/TabView items from a previous parent before adopting them #11353

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Merged
NathanWalker merged 2 commits into from
Aug 17, 2026
Conversation 1 Commits 2 Checks 6 Files changed
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fix(core): detach SegmentedBar/TabView items from a previous parent before adopting them #11353

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999b456
fix(segmented-bar): detach items from a previous parent before adopti…
edusperoni Aug 17, 2026
682aeba
fix(tab-view): detach items from a previous parent before adopting them
edusperoni Aug 17, 2026
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33 changes: 33 additions & 0 deletions apps/automated/src/ui/segmented-bar/segmented-bar-tests.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -274,6 +274,39 @@ export function test_SettingNumberAsTitleFromXML_DoesNotThrow() {
});
}

export function test_SettingTheSameItemsToAnotherSegmentedBar_DoesNotThrow() {
const items = _createItems(3);
const firstBar = _createSegmentedBar();

buildUIAndRunTest(firstBar, function (views: Array<View>) {
firstBar.items = items;

const secondBar = _createSegmentedBar();
secondBar.items = items;

items.forEach((item, i) => TKUnit.assertEqual(item.parent, secondBar, `Item ${i} should be parented to the SegmentedBar it was last assigned to.`));
});
}

export function test_SettingTheItemsOfATornDownSegmentedBarToANewOne_DoesNotThrow() {
const items = _createItems(3);
const firstBar = _createSegmentedBar();

buildUIAndRunTest(firstBar, function (views: Array<View>) {
firstBar.items = items;
});

// The test above leaves the page without content, so firstBar is torn down while its items still point at it.
const secondBar = _createSegmentedBar();

buildUIAndRunTest(secondBar, function (views: Array<View>) {
secondBar.items = items;

items.forEach((item, i) => TKUnit.assertEqual(item.parent, secondBar, `Item ${i} should be parented to the SegmentedBar it was last assigned to.`));
TKUnit.assertEqual(segmentedBarTestsNative.getNativeItemsCount(secondBar), items.length, 'Native items should be created for the SegmentedBar the items were re-assigned to.');
});
}

/*export function testBackgroundColorUpdatedAfterItemSelected() {
let segmentedBar = new segmentedBarModule.SegmentedBar();
let item1 = new segmentedBarModule.SegmentedBarItem();
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30 changes: 30 additions & 0 deletions apps/automated/src/ui/tab-view/tab-view-tests.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,36 @@ export class TabViewTest extends UITest<tabViewModule.TabView> {
}, 'Binding TabView to a TabViewItem with null view should throw.');
};

public test_SettingTheSameItemsToAnotherTabView_DoesNotThrow = function () {
var tabView = this.testView;
var items = this._createItems(2);
tabView.items = items;
this.waitUntilTestElementIsLoaded();

var secondTabView = new tabViewModule.TabView();
secondTabView.items = items;

items.forEach((item, i) => TKUnit.assertEqual(item.parent, secondTabView, `Item ${i} should be parented to the TabView it was last assigned to.`));
};

public test_SettingTheItemsOfATornDownTabViewToANewOne_DoesNotThrow = function () {
var tabView = this.testView;
var items = this._createItems(2);
tabView.items = items;
this.waitUntilTestElementIsLoaded();

// Detaching the TabView tears it down, but its items still point at it.
this.testPage.content = null;

var secondTabView = new tabViewModule.TabView();
secondTabView.items = items;
this.testPage.content = secondTabView;
TKUnit.waitUntilReady(() => secondTabView.isLoaded, 1);

items.forEach((item, i) => TKUnit.assertEqual(item.parent, secondTabView, `Item ${i} should be parented to the TabView it was last assigned to.`));
TKUnit.assertEqual(tabViewTestsNative.getNativeTabCount(secondTabView), items.length, 'Native tabs should be created for the TabView the items were re-assigned to.');
};

public testWhenSelectingATabNativelySelectedIndexIsUpdatedProperly = function () {
var tabView = this.testView;
tabView.items = this._createItems(2);
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8 changes: 7 additions & 1 deletion packages/core/ui/segmented-bar/segmented-bar-common.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -84,7 +84,13 @@ export abstract class SegmentedBarBase extends View implements SegmentedBarDefin

if (newItems) {
for (let i = 0, count = newItems.length; i < count; i++) {
this._addView(newItems[i]);
const item = newItems[i];
// A view can only have one parent, and _addView throws if it already has one.
if (item.parent && item.parent !== this) {
item.parent._removeView(item);
}

this._addView(item);
}
}
}
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5 changes: 5 additions & 0 deletions packages/core/ui/tab-view/tab-view-common.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -207,6 +207,11 @@ export class TabViewBase extends View implements TabViewDefinition, AddChildFrom
throw new Error(`TabViewItem must have a view.`);
}

// A view can only have one parent, and _addView throws if it already has one.
if (item.parent && item.parent !== this) {
item.parent._removeView(item);
}

this._addView(item);
});
}
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