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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.WixBA
{
using System;
using System.Windows;
using System.Windows.Media;
/// <summary>
/// Dependency Properties associated with the main Window object.
/// </summary>
public class WindowProperties : DependencyObject
{
/// <summary>
/// Dependency Property to hold the result of detecting the relative luminosity (or brightness) of a Windows background.
/// </summary>
public static readonly DependencyProperty IsLightBackgroundProperty = DependencyProperty.Register(
"IsLightBackground", typeof(bool), typeof(WindowProperties), new PropertyMetadata( false ));
private static Lazy<WindowProperties> _instance = new Lazy<WindowProperties>(() =>
{
WindowProperties wp = new WindowProperties();
wp.CheckBackgroundBrightness();
return wp;
});
public static WindowProperties Instance
{
get
{
return _instance.Value;
}
}
public bool IsLightBackground
{
get { return (bool)GetValue(IsLightBackgroundProperty); }
private set { SetValue(IsLightBackgroundProperty, value); }
}
/// <summary>
/// Use the Luminosity parameter of the background color to detect light vs dark theme settings.
/// </summary>
/// <remarks>
/// This approach detects both the common High Contrast themes (White vs Black) and custom themes which may have relatively lighter backgrounds.
/// </remarks>
public void CheckBackgroundBrightness()
{
SolidColorBrush windowbrush = System.Windows.SystemColors.WindowBrush;
System.Drawing.Color dcolor = System.Drawing.Color.FromArgb(windowbrush.Color.A, windowbrush.Color.R, windowbrush.Color.G, windowbrush.Color.B);
var brightness = dcolor.GetBrightness();
// Test for 'Lightness' at an arbitrary point, approaching 1.0 (White).
if (0.7 < brightness)
{
this.IsLightBackground = true;
}
else
{
this.IsLightBackground = false;
}
}
}
}
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