少有人走的路

样式

App.axaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="_08_Styles.App">

  <Application.Styles>
    <FluentTheme />
  </Application.Styles>

  <Application.Resources>
    <ResourceDictionary>
      <SolidColorBrush x:Key="PrimaryBrush" Color="#6200EE"/>
      <SolidColorBrush x:Key="SecondaryBrush" Color="#03DAC6"/>
      <SolidColorBrush x:Key="DangerBrush" Color="#CF6679"/>
      <SolidColorBrush x:Key="SuccessBrush" Color="#4CAF50"/>
    </ResourceDictionary>
  </Application.Resources>

</Application>

MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="_08_Styles.MainWindow"
        Title="Styles - 样式和主题演示"
        Width="550"
        Height="550">

  <ScrollViewer>
    <StackPanel Margin="20" Spacing="25">

      <TextBlock Text="样式（Styles）和主题（Theme）演示" FontSize="20" FontWeight="Bold"/>

      <Border Background="#F5F5F5" Padding="15" CornerRadius="8">
        <StackPanel Spacing="15">
          <TextBlock Text="1. 全局样式资源（App.Resources）" FontSize="16" FontWeight="Bold"/>

          <Button Content="使用 PrimaryBrush"
                  Background="{DynamicResource PrimaryBrush}"
                  Foreground="White"
                  Padding="20,10"/>

          <Button Content="使用 SuccessBrush"
                  Background="{DynamicResource SuccessBrush}"
                  Foreground="White"
                  Padding="20,10"/>
        </StackPanel>
      </Border>

      <Border Background="#F5F5F5" Padding="15" CornerRadius="8">
        <StackPanel Spacing="15">
          <TextBlock Text="2. 控件样式类（Button Classes）" FontSize="16" FontWeight="Bold"/>

          <WrapPanel >
            <Button Content="Primary" Classes="Primary" Padding="15,8"/>
            <Button Content="Success" Classes="Success" Padding="15,8"/>
            <Button Content="Danger" Classes="Danger" Padding="15,8"/>
            <Button Content="Light" Classes="Light" Padding="15,8"/>
          </WrapPanel>

          <TextBlock Text="按钮支持多种样式类组合，如 Primary Success Danger Light"
                     FontSize="12" Foreground="Gray"/>
        </StackPanel>
      </Border>

      <Border Background="#F5F5F5" Padding="15" CornerRadius="8">
        <StackPanel Spacing="15">
          <TextBlock Text="3. 自定义按钮样式" FontSize="16" FontWeight="Bold"/>

          <Button x:Name="CustomButton"
                  Content="自定义样式按钮"
                  Padding="25,12"/>

          <StackPanel Orientation="Horizontal" Spacing="10">
            <Button x:Name="SetPrimaryBtn" Content="设为主色" Click="OnSetPrimary"/>
            <Button x:Name="SetSuccessBtn" Content="设为成功" Click="OnSetSuccess"/>
            <Button x:Name="SetDangerBtn" Content="设为危险" Click="OnSetDanger"/>
            <Button x:Name="ResetBtn" Content="重置" Click="OnReset"/>
          </StackPanel>
        </StackPanel>
      </Border>

      <Border Background="#F5F5F5" Padding="15" CornerRadius="8">
        <StackPanel Spacing="15">
          <TextBlock Text="4. 内置主题切换" FontSize="16" FontWeight="Bold"/>

          <TextBlock Text="当前使用 FluentTheme，可在 App.axaml 中切换为 SimpleTheme"
                     TextWrapping="Wrap"/>

          <StackPanel Orientation="Horizontal" Spacing="10">
            <TextBlock Text="主题示例：" VerticalAlignment="Center"/>
            <Border Background="#6200EE" Padding="10,5" CornerRadius="4">
              <TextBlock Text="Fluent" Foreground="White" FontSize="12"/>
            </Border>
          </StackPanel>
        </StackPanel>
      </Border>

      <Border Background="#E3F2FD" Padding="15" CornerRadius="8">
        <StackPanel Spacing="10">
          <TextBlock Text="学习要点" FontSize="16" FontWeight="Bold" Foreground="#1565C0"/>
          <TextBlock Text="- ResourceDictionary：定义全局可复用的资源（画刷、颜色等）"
                     TextWrapping="Wrap"/>
          <TextBlock Text="- 控件样式类（Classes）：为控件添加预定义的样式组合"
                     TextWrapping="Wrap"/>
          <TextBlock Text="- DynamicResource：引用动态资源，运行时可更改"
                     TextWrapping="Wrap"/>
          <TextBlock Text="- 主题：Avalonia 内置 FluentTheme 和 SimpleTheme 两种主题"
                     TextWrapping="Wrap"/>
        </StackPanel>
      </Border>

    </StackPanel>
  </ScrollViewer>
</Window>

MainWindow.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;

namespace _08_Styles;

public partial class MainWindow : Window
{
    private readonly SolidColorBrush _primaryBrush = new(Color.Parse("#6200EE"));
    private readonly SolidColorBrush _successBrush = new(Color.Parse("#4CAF50"));
    private readonly SolidColorBrush _dangerBrush = new(Color.Parse("#CF6679"));
    private readonly SolidColorBrush _defaultBrush;

    public MainWindow()
    {
        InitializeComponent();
        _defaultBrush = (SolidColorBrush)CustomButton.Background!;
    }

    private void OnSetPrimary(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        CustomButton.Background = _primaryBrush;
        CustomButton.Foreground = Brushes.White;
    }

    private void OnSetSuccess(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        CustomButton.Background = _successBrush;
        CustomButton.Foreground = Brushes.White;
    }

    private void OnSetDanger(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        CustomButton.Background = _dangerBrush;
        CustomButton.Foreground = Brushes.White;
    }

    private void OnReset(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        CustomButton.Background = _defaultBrush;
        CustomButton.Foreground = Brushes.Black;
    }
}

效果：