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using System;
using System.Threading.Tasks;
using ElectronNET.API.Entities;
namespace ElectronNET.API.Interfaces
{
/// <summary>
/// Read and respond to changes in Chromium's native color theme.
/// </summary>
public interface INativeTheme
{
/// <summary>
/// Setting this property to <see cref="ThemeSourceMode.System"/> will remove the override and everything will be reset to the OS default. By default 'ThemeSource' is <see cref="ThemeSourceMode.System"/>.
/// <para/>
/// Settings this property to <see cref="ThemeSourceMode.Dark"/> will have the following effects:
/// <list type="bullet">
/// <item>
/// <description><see cref="ShouldUseDarkColorsAsync"/> will be <see langword="true"/> when accessed</description>
/// </item>
/// <item>
/// <description>Any UI Electron renders on Linux and Windows including context menus, devtools, etc. will use the dark UI.</description>
/// </item>
/// <item>
/// <description>Any UI the OS renders on macOS including menus, window frames, etc. will use the dark UI.</description>
/// </item>
/// <item>
/// <description>The 'prefers-color-scheme' CSS query will match 'dark' mode.</description>
/// </item>
/// <item>
/// <description>The 'updated' event will be emitted</description>
/// </item>
/// </list>
/// <para/>
/// Settings this property to <see cref="ThemeSourceMode.Light"/> will have the following effects:
/// <list type="bullet">
/// <item>
/// <description><see cref="ShouldUseDarkColorsAsync"/> will be <see langword="false"/> when accessed</description>
/// </item>
/// <item>
/// <description>Any UI Electron renders on Linux and Windows including context menus, devtools, etc. will use the light UI.</description>
/// </item>
/// <item>
/// <description>Any UI the OS renders on macOS including menus, window frames, etc. will use the light UI.</description>
/// </item>
/// <item>
/// <description>The 'prefers-color-scheme' CSS query will match 'light' mode.</description>
/// </item>
/// <item>
/// <description>The 'updated' event will be emitted</description>
/// </item>
/// </list>
/// The usage of this property should align with a classic "dark mode" state machine in your application where the user has three options.
/// <para/>
/// <list type="bullet">
/// <item>
/// <description>Follow OS: SetThemeSource(ThemeSourceMode.System);</description>
/// </item>
/// <item>
/// <description>Dark Mode: SetThemeSource(ThemeSourceMode.Dark);</description>
/// </item>
/// <item>
/// <description>Light Mode: SetThemeSource(ThemeSourceMode.Light);</description>
/// </item>
/// </list>
/// Your application should then always use <see cref="ShouldUseDarkColorsAsync"/> to determine what CSS to apply.
/// </summary>
/// <param name="themeSourceMode">The new ThemeSource.</param>
void SetThemeSource(ThemeSourceMode themeSourceMode);
/// <summary>
/// A <see cref="ThemeSourceMode"/> property that can be <see cref="ThemeSourceMode.System"/>, <see cref="ThemeSourceMode.Light"/> or <see cref="ThemeSourceMode.Dark"/>. It is used to override (<seealso cref="SetThemeSource"/>) and
/// supercede the value that Chromium has chosen to use internally.
/// </summary>
Task<ThemeSourceMode> GetThemeSourceAsync();
/// <summary>
/// A <see cref="bool"/> for if the OS / Chromium currently has a dark mode enabled or is
/// being instructed to show a dark-style UI. If you want to modify this value you
/// should use <see cref="SetThemeSource"/>.
/// </summary>
Task<bool> ShouldUseDarkColorsAsync();
/// <summary>
/// A <see cref="bool"/> for if the OS / Chromium currently has high-contrast mode enabled or is
/// being instructed to show a high-contrast UI.
/// </summary>
Task<bool> ShouldUseHighContrastColorsAsync();
/// <summary>
/// A <see cref="bool"/> for if the OS / Chromium currently has an inverted color scheme or is
/// being instructed to use an inverted color scheme.
/// </summary>
Task<bool> ShouldUseInvertedColorSchemeAsync();
/// <summary>
/// Emitted when something in the underlying NativeTheme has changed. This normally means that either the value of <see cref="ShouldUseDarkColorsAsync"/>,
/// <see cref="ShouldUseHighContrastColorsAsync"/> or <see cref="ShouldUseInvertedColorSchemeAsync"/> has changed. You will have to check them to determine which one has changed.
/// </summary>
event Action Updated;
}
}