NativeScript/tests/app/text/formatted-string-tests.ts

// >> formatted-string-require
import { FormattedString } from "@nativescript/core/text/formatted-string";
import { Span } from "@nativescript/core/text/span";
// << formatted-string-require

import { Observable } from "@nativescript/core/data/observable";
import { Label } from "@nativescript/core/ui/label";
import * as TKUnit from "../tk-unit";

export function test_FormattedString_RemovesEventListeners_for_spans() {
    // >> formatted-string-set
    const label = new Label();
    const formattedString = new FormattedString();
    const firstSpan = new Span();

    firstSpan.fontSize = 15;
    firstSpan.text = "LoremIpsum";
    formattedString.spans.push(firstSpan);
    label.formattedText = formattedString;
    // << formatted-string-set

    TKUnit.assert(formattedString.spans.getItem(0).hasListeners(Observable.propertyChangeEvent) === true, "Listener for spans collection change event is not attached!");
    const removedSpan = formattedString.spans.pop();
    TKUnit.assert(removedSpan.hasListeners(Observable.propertyChangeEvent) === false, "Listener for spans collection change event is not removed!");
}

export function test_FormattedTextProperty_IsChanged_When_SpanIsAdded() {
    const formattedString = new FormattedString();
    let formattedTextChanged = false;
    formattedString.addEventListener(Observable.propertyChangeEvent, () => {
        formattedTextChanged = true;
    });

    const firstSpan = new Span();
    firstSpan.fontSize = 15;
    firstSpan.text = "LoremIpsum";
    formattedString.spans.push(firstSpan);

    TKUnit.assertTrue(formattedTextChanged, "FormattedText property is not changed.");
}

export function test_FormattedTextProperty_IsChanged_When_SpanIsChanged() {
    const formattedString = new FormattedString();
    const expectedValue = 17;

    const firstSpan = new Span();
    firstSpan.fontSize = 15;
    firstSpan.text = "LoremIpsum";
    formattedString.spans.push(firstSpan);

    let formattedTextChanged = false;
    formattedString.addEventListener(Observable.propertyChangeEvent, () => {
        formattedTextChanged = true;
    });

    firstSpan.fontSize = expectedValue;

    TKUnit.assertTrue(formattedTextChanged, "FormattedText property is not changed.");
    TKUnit.assert(formattedString.spans.getItem(0).fontSize === expectedValue, "FormattedString internal span is not changed as expected");
}

export function test_FormattedTextProperty_DoNotCrash_When_KnownColorIsSetForForegroundColor() {
    const formattedString = new FormattedString();
    const expectedValue1 = "red";
    const expectedValue2 = "blue";

    const firstSpan = new Span();
    firstSpan.color = <any>expectedValue1;
    firstSpan.text = "LoremIpsum1";
    formattedString.spans.push(firstSpan);

    const secondSpan = new Span();
    secondSpan.backgroundColor = <any>expectedValue2;
    secondSpan.text = "LoremIpsum2";
    formattedString.spans.push(secondSpan);

    TKUnit.assertEqual(formattedString.spans.getItem(0).color.name, expectedValue1);
    TKUnit.assertEqual(formattedString.spans.getItem(1).backgroundColor.name, expectedValue2);
}