【MAUI Blazor踩坑日记】3.Windows标题栏自定义颜色,运行时改变颜色

目录

(提示!!!.Net 8中该方法已失效)

MAUI中Windows默认的标题栏颜色是灰色的,有一点丑。

如果去掉默认的标题栏,自己画一个,可能会出现问题,也比较麻烦。

想要自定义默认标题栏的颜色,官方又没有提供接口。找过了很多资料,也用过很多办法,始终不能完美的解决这个问题,大多数只是类似于配置的修改,不能在运行时修改颜色。

直到看到一位大佬的文章https://www.dongchuanmin.com/net/2955.html ,终于有了眉目。

在Win10和Win11中都可以正常用。

修改默认颜色

找到Platforms/Windows/App.xaml

<maui:MauiWinUIApplication
    x:Class="MauiApp1.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:MauiApp1.WinUI">
    <Application.Resources>
        <ResourceDictionary>
            <SolidColorBrush x:Key="WindowCaptionBackground">#fff</SolidColorBrush>
            <SolidColorBrush x:Key="WindowCaptionBackgroundDisabled">#fff</SolidColorBrush>
            <SolidColorBrush x:Key="WindowCaptionForeground">#000</SolidColorBrush>
            <SolidColorBrush x:Key="WindowCaptionForegroundDisabled">#000</SolidColorBrush>
        </ResourceDictionary>
    </Application.Resources>
</maui:MauiWinUIApplication>

修改运行时颜色

  • 安装NuGet包

    NuGet包中搜索 PInvoke.User32 ,安装它

    image

    特别提示

    项目文件中请务必按照下面这样写,否则打包的时候其他平台也会将PInvoke.User32这个包打进去,实际上是完全无用的,它只适用于Windows。

     ```
     <PackageReference Include="PInvoke.User32" Version="0.7.124" Condition="$(TargetFramework.Contains('-windows')) == true" />
     ```
    
  • 添加修改标题栏颜色的类

    Platforms/Windows文件夹下添加WindowsTitleBar.cs

    using Microsoft.Maui.Platform;
    using PInvoke;
    using WinRT.Interop;
    using static PInvoke.User32;
    
    namespace MauiApp1
    {
    # nullable disable
    	public static class WindowsTitleBar
    	{
    		private static Microsoft.UI.Xaml.Window GetActiveNativeWindow() =>
    		(Microsoft.UI.Xaml.Window)Application.Current.Windows.FirstOrDefault()?.Handler?.PlatformView;
    
    		public static void SetColorForWindows(Color backgroundColor,Color foregroundColor)
    		{
    			var res = Microsoft.UI.Xaml.Application.Current.Resources;
    			res["WindowCaptionBackground"] = backgroundColor.ToWindowsColor();
    			res["WindowCaptionBackgroundDisabled"] = backgroundColor.ToWindowsColor();
    			res["WindowCaptionForeground"] = foregroundColor.ToWindowsColor();
    			res["WindowCaptionForegroundDisabled"] = foregroundColor.ToWindowsColor();
    			TriggertTitleBarRepaint();
    		}
    
    		private static bool TriggertTitleBarRepaint()
    		{
    #if WINDOWS
    			var nativeWindow = GetActiveNativeWindow();
    			if (nativeWindow is null) 
    			{ 
    				return default; 
    			}
    
    			var hWnd = WindowNative.GetWindowHandle(nativeWindow);
    			var activeWindow = User32.GetActiveWindow();
    			if (hWnd == activeWindow)
    			{
    				User32.PostMessage(hWnd, WindowMessage.WM_ACTIVATE, new IntPtr((int)0x00), IntPtr.Zero);
    				User32.PostMessage(hWnd, WindowMessage.WM_ACTIVATE, new IntPtr((int)0x01), IntPtr.Zero);
    			}
    			else
    			{
    				User32.PostMessage(hWnd, WindowMessage.WM_ACTIVATE, new IntPtr((int)0x01), IntPtr.Zero);
    				User32.PostMessage(hWnd, WindowMessage.WM_ACTIVATE, new IntPtr((int)0x00), IntPtr.Zero);
    			}
    
    #endif
    			return true;
    		}
    	}
    }
    
    
  • 调用

    #if WINDOWS
    	var backgroundColor = Colors.White;
    	var foreColor = Colors.Black;
    	WindowsTitleBar.SetColorForWindows(backgroundColor, foreColor);
    #endif
    

效果图

image

posted @ 2023-04-26 17:25  Yu-Core  阅读(299)  评论(0编辑  收藏  举报