Work with Color Themes

What you should know beforehand:

Examples (?):

Changing user interface colors depending on the selected theme can be automated by means of the ColorThemeManager component. For example, we want to change the background and foreground colors of some UI control:

public class UiThemeViewModel : AAutomation
{
    public IProperty<SolidColorBrush> BackgroundColor { get; set; }
    public IProperty<SolidColorBrush> TextColor { get; set; }
 
    public UiThemeViewModel(Lifetime lifetime, IColorThemeManager colorThemeManager)
    {
        BackgroundColor = new Property<SolidColorBrush>(lifetime, "UiThemeViewModel.BackgroundColor") {Value = new SolidColorBrush()};
        TextColor = new Property<SolidColorBrush>(lifetime, "UiThemeViewModel.TextColor") {Value = new SolidColorBrush()};
 
        var bgColor = colorThemeManager.CreateLiveColor(lifetime, ThemeColor.ToolWindowBackground);
        bgColor.ForEachValue(lifetime, (lt, color) => { BackgroundColor.Value.Color = color.WpfColor; });
 
        var txtColor = colorThemeManager.CreateLiveColor(lifetime, ThemeColor.ToolWindowForeground);
        txtColor.ForEachValue(lifetime, (lt, color) => { TextColor.Value.Color = color.WpfColor; });
    }
}

Notes

The CreateLiveColor method of ColorThemeManager returns IProperty that is bound to the value of a particular ThemeColor.
The ForEachValue method of IProperty allows assigning the updated color each time it is changed. The main difference in comparison with the Advise method is that ForEachValue passes a per-value lifetime (lt). It is terminated each time a new value is assigned to the property and allows defining a pair of actions (after-value-comes - before-value-goes) for each new value.

Last modified: 20 April 2023