WPF使用WindowChrome自定义标题栏

第一步：基本实现

添加Window的Style定义，并设置WindowChrome.WindowChrome属性；
设置WindowChrome标题栏：

CaptionHeight——主要用于拖动有效区；
GlassFrameThickness——影响标题栏系统按钮显示，0表示不使用系统按钮【后面介绍】，-1表示用的系统默认值，如下示例则表示标题栏高度30；
自定义窗体Title

第二步：优化边界处理

方法1：模板添加最大化触发器，设置最大化时，内部布局Margin设为8
方法2：模板添加最大化触发器，设置最大化时，限制布局最大化的宽高最大值

第三步：完全自定义标题栏【即，不使用系统的操作按钮】

初步操作类似第一步，其中将GlassFrameThickness设置为0
在内容定义部分添加自定义的标题栏，添加操作按钮，并设置按钮属性WindowChrome.IsHitTestVisibleInChrome="True"
如果不设置WindowChrome.IsHitTestVisibleInChrome，则由于我们之前设置CaptionHeight，则这个区域内，按钮将失效。

但是，也不能将整个标题栏布局设置这个属性，那样会完全覆盖系统标题栏的操作，如拖动效果，即CaptionHeight设置的那个区域

<Window x:Class="WindowChrome自定义窗体样式.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WindowChrome自定义窗体样式"
        mc:Ignorable="d"
         Title="MainWindow" Height="450" Width="800"
        FontWeight="ExtraLight" ResizeMode="CanResize" WindowStartupLocation="CenterScreen"
        WindowStyle="None" AllowsTransparency="True" Background="{x:Null}">
    <Window.Resources>
        <Style x:Key="btn_nap" TargetType="{x:Type Button}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border Background="{TemplateBinding Background}">
                            <ContentPresenter VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                              HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"></ContentPresenter>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="FontSize" Value="18"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Background" Value="Transparent"/>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Opacity" Value="0.7"/>
                </Trigger>
                <!--<Trigger Property="IsMouseOver" Value="False">
                    <Setter Property="Background" Value="#EEF0F5"/>
                </Trigger>-->
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <WindowChrome.WindowChrome>
        <WindowChrome CaptionHeight="35" UseAeroCaptionButtons="False" x:Name="windowChrome" CornerRadius="0" GlassFrameThickness="0"/>
    </WindowChrome.WindowChrome>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="35"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid Background="#3C6AB1">
            <TextBlock x:Name="lblTitle" Text="测试" Foreground="White" FontSize="14" Margin="10 0 0 0" VerticalAlignment="Center"/>
            <StackPanel  Orientation="Horizontal" HorizontalAlignment="Right">
                <Button  WindowChrome.IsHitTestVisibleInChrome="True"  Name="button_MiniSize" Content="─" Style="{StaticResource btn_nap}" HorizontalAlignment="Right" Foreground="White" Margin="0 0 5 0" Height="30" Width="30"/>
                <Button WindowChrome.IsHitTestVisibleInChrome="True" Name="button_MaxSize" Content="☐" Style="{StaticResource btn_nap}" HorizontalAlignment="Right" Foreground="White" Margin="0 0 5 0" Height="30" Width="30"/>
                <Button WindowChrome.IsHitTestVisibleInChrome="True" x:Name="btn_Close" Content="✕" Style="{StaticResource btn_nap}" HorizontalAlignment="Right" Foreground="White" Margin="0 0 5 0" Height="30" Width="30"/>
            </StackPanel>
        </Grid>
        <Grid Grid.Row="1" Background="LightBlue">

        </Grid>
    </Grid>
</Window>

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.button_MiniSize.Click += Btn_Min_Click;
            this.button_MaxSize.Click += Btn_Max_Click;
            this.btn_Close.Click += Btn_Close_Click;
            //CommandBindings.Add(new CommandBinding(SystemCommands.CloseWindowCommand, (_, __) => { SystemCommands.CloseWindow(this); }));
            //CommandBindings.Add(new CommandBinding(SystemCommands.MinimizeWindowCommand, (_, __) => { SystemCommands.MinimizeWindow(this); }));
            //CommandBindings.Add(new CommandBinding(SystemCommands.MaximizeWindowCommand, (_, __) => { SystemCommands.MaximizeWindow(this); }));
            //CommandBindings.Add(new CommandBinding(SystemCommands.RestoreWindowCommand, (_, __) => { SystemCommands.RestoreWindow(this); }));
            //CommandBindings.Add(new CommandBinding(SystemCommands.ShowSystemMenuCommand, ShowSystemMenu));
        }
        //private void ShowSystemMenu(object sender, ExecutedRoutedEventArgs e)
        //{
        //    var element = e.OriginalSource as FrameworkElement;
        //    if (element == null)
        //        return;

        //    var position = WindowState == WindowState.Maximized ? new Point(0, element.ActualHeight)
        //        : new Point(Left + BorderThickness.Left, element.ActualHeight + Top + BorderThickness.Top);
        //    position = element.TransformToAncestor(this).Transform(position);
        //    SystemCommands.ShowSystemMenu(this, position);
        //}
        private void Btn_Close_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void Btn_Max_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = WindowState.Maximized == this.WindowState ? WindowState.Normal : WindowState.Maximized;
        }

        private void Btn_Min_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = WindowState.Minimized;
        }
    }