public static void AssertContrastRatio(Color foreground, Color background, double minimumContrastRatio)
{
const double tollerance = 0.1;
var ratio = ColorAssist.ContrastRatio(foreground, background);
Assert.True(ratio >= minimumContrastRatio - tollerance, $"Contrast ratio '{ratio}' is less than {minimumContrastRatio} with a tollerance of 0.1");
}
public async Task PrimaryColor_AdjustToTheme(PrimaryColor primary)
{
await using var recorder = new TestRecorder(App);
await App.InitialzeWithMaterialDesign(BaseTheme.Light, primary, colorAdjustment : new ColorAdjustment());
IWindow window = await App.CreateWindow <ColorAdjustWindow>();
await recorder.SaveScreenshot();
Color windowBackground = await window.GetBackgroundColor();
IVisualElement themeToggle = await window.GetElement("/ToggleButton");
IVisualElement largeText = await window.GetElement("/TextBlock[0]");
IVisualElement smallText = await window.GetElement("/TextBlock[1]");
await AssertContrastRatio();
await themeToggle.Click();
await Wait.For(async() => await window.GetBackgroundColor() != windowBackground);
await AssertContrastRatio();
recorder.Success();
async Task AssertContrastRatio()
{
Color largeTextForeground = await largeText.GetForegroundColor();
Color largeTextBackground = await largeText.GetEffectiveBackground();
Color smallTextForeground = await smallText.GetForegroundColor();
Color smallTextBackground = await smallText.GetEffectiveBackground();
var largeContrastRatio = ColorAssist.ContrastRatio(largeTextForeground, largeTextBackground);
Assert.True(largeContrastRatio >= MaterialDesignSpec.MinimumContrastLargeText, $"Large font contrast ratio '{largeContrastRatio}' does not meet material design spec {MaterialDesignSpec.MinimumContrastLargeText}");
var smallContrastRatio = ColorAssist.ContrastRatio(smallTextForeground, smallTextBackground);
Assert.True(smallContrastRatio >= MaterialDesignSpec.MinimumContrastSmallText, $"Small font contrast ratio '{smallContrastRatio}' does not meet material design spec {MaterialDesignSpec.MinimumContrastSmallText}");
}
}