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：

1. CaptionHeight——主要用于拖动有效区；
2. 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；
3. 自定义窗体Title

第二步：优化边界处理

1. 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
2. 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】

1. 初步操作类似第一步，其中将GlassFrameThickness设置为0
2. 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"
3. 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。
4. 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;
           }
       }