How to disable MAUI.NET app theming from Windows

Question

When I do a MAUI.NET application automatically I got some styling. Partially this is done in styles.xaml, but even if I remove it I still have some styling derived from Windows theme. I have found 3 examples:

if you focus in entry the there appear a horizontal line at the bottom of it
some vertical line appears next to the selected value in picker
selected text got a colour of Windows theme in entry and editor

This is kind fruustraing, but I managed to disable the first option by filling Project/Platforms/Windows/App.xaml file in the manner:

<maui:MauiWinUIApplication
    x:Class="Secretly.WinUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:maui="using:Microsoft.Maui"
    xmlns:local="using:___.WinUI">  // ___ is a project name
    <maui:MauiWinUIApplication.Resources> // added this line
        <Thickness x:Key="TextControlBorderThemeThickness">0</Thickness> // added this line
        <Thickness x:Key="TextControlBorderThemeThicknessFocused">0</Thickness> // added this line
    </maui:MauiWinUIApplication.Resources> // added this line
</maui:MauiWinUIApplication>

Is that possible to just turn off this on Windows or even on all platforms? I hope Microsoft respect the situation when developer wants to make his/her application unique and manage it by his/her own.

If not - then side question is how to set selected text color in entry and editor controls as well as this weird vertical line in picker next to choosen value?

Please let me know in comments what is wrong with this question... Is is not cleat? Surely this is not a question about opinion like the last time someone had a problem to my post... So what is wrong this time? — jaydopartu, Oct 13 '22 at 20:45

score 0 · Answer 1 · answered Oct 19 '22 at 10:04

you could use handlers like this to set selected text color:

Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("MyCustomization", (handler, view) =>
    {
#if WINDOWS
       
       
           handler.PlatformView.SelectionHighlightColor=new Microsoft.UI.Xaml.Media.SolidColorBrush( Windows.UI.Color.FromArgb(255, 255, 0, 0));
       
#endif
    });

For more info, please refer to Customize controls with handlers

How to disable MAUI.NET app theming from Windows

1 Answers1