WIN11 Snap 是什么？自定义 WINDOW 如何使用 Snap 功能？快

WIN11 Snap 是什么？自定义 WINDOW 怎样使用 Snap 功能？

控件名：Snap

作者：WPFDevelopersOrg – 驚鏵

原文链接[1]：https://github.com/WPFDevelopersOrg/WPFDevelopers

码云链接[2]：https://gitee.com/WPFDevelopersOrg/WPFDevelopers

框架支持.NET4 至 .NET8；Visual Studio 2022;

Issue：Window 控件在 Win11 下不支持 Snap 功能[3]

Snap 是什么？

Snap Layouts 是 Windows 11 的一项新功能，然而体系版本号必须 ≥ 21H2 。

Snap Layouts

Snap Layouts 提供 6 种不同的布局；双窗口排列 2 种三窗口排列 3 种四窗口排列 1 种提供了多种预设的窗口布局，可以将窗口快速调整到屏幕的左侧、右侧、上方、下方，甚至是四分其中一个屏幕区域；可以通过将窗口拖动到屏幕边缘来启动 Snap，或使用快捷键（Win + 左/右箭头、Win + 上/下箭头）来实现；在应用程序或窗口中按下「Win + Z」快捷键，或是将鼠标光标悬停在窗口最大化按钮上以显示 Snap Layout 菜单。分屏允许通过将屏幕的一半或四分其中一个，让多任务处理变得更加流畅，对于大屏幕或多显示器的用户尤其有用；怎样在 WPF 中自定义 Window 支持 SnapLayout 功能1. 修改 Window.cs重写 OnSourceInitialized,实现 Win32 消息钩子 HwndSourceHook;WM_NCHITTEST：用于检测鼠标在 Window 的哪个区域;WM_NCLBUTTONDOWN：鼠标左键按下，是否在深入了解栏按钮;处理 Snap Layout 消息 HandleSnapLayoutMessage;获取当前最大化还是还原按钮;通过 lParam 获取鼠标屏幕坐标，是否在最大化或者还原按钮上;接着返回 HTMAXBUTTON 通知体系鼠标现在在最大化按钮上;

using Microsoft.Windows.Shell;
using System;
using System.Windows;
using System.Windows.Automation.Peers;
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using WPFDevelopers.Controls;
using WPFDevelopers.Core.Helpers;
using WPFDevelopers.Helpers;

namespaceWPFDevelopers.Net40

[TemplatePart(Name = TitleBarIcon, Type = typeof(Button))]
[TemplatePart(Name = HighTitleMaximizeButton, Type = typeof(Button))]
[TemplatePart(Name = HighTitleRestoreButton, Type = typeof(Button))]
[TemplatePart(Name = TitleBarMaximizeButton, Type = typeof(Button))]
[TemplatePart(Name = TitleBarRestoreButton, Type = typeof(Button))]
publicclassWindow : System.Windows.Window

privateconststring TitleBarIcon = “PART_TitleBarIcon”;
privateconststring HighTitleMaximizeButton = “PART_MaximizeButton”;
privateconststring HighTitleRestoreButton = “PART_RestoreButton”;
privateconststring TitleBarMaximizeButton = “PART_TitleBarMaximizeButton”;
privateconststring TitleBarRestoreButton = “PART_TitleBarRestoreButton”;
private WindowStyle _windowStyle;
private Button _titleBarIcon;
private Button _highTitleMaximizeButton;
private Button _highTitleRestoreButton;
private Button _titleBarMaximizeButton;
private Button _titleBarRestoreButton;
private IntPtr hWnd;

publicstaticreadonly DependencyProperty TitleHeightProperty =
DependencyProperty.Register(“TitleHeight”, typeof(double), typeof(Window), new PropertyMetadata(50d));

publicstaticreadonly DependencyProperty NoChromeProperty =
DependencyProperty.Register(“NoChrome”, typeof(bool), typeof(Window), new PropertyMetadata(false));

publicstaticreadonly DependencyProperty TitleBarProperty =
DependencyProperty.Register(“TitleBar”, typeof(object), typeof(Window), new PropertyMetadata());

publicstaticreadonly DependencyProperty TitleBackgroundProperty =
DependencyProperty.Register(“TitleBackground”, typeof(Brush), typeof(Window), new PropertyMetadata());

publicstaticreadonly DependencyProperty TitleBarModeProperty =
DependencyProperty.Register(“TitleBarMode”, typeof(TitleBarMode), typeof(Window), new PropertyMetadata(TitleBarMode.Normal));

static Window()

DefaultStyleKeyProperty.OverrideMetadata(typeof(Window), new FrameworkPropertyMetadata(typeof(Window)));
}

public Window()

WPFDevelopers.Resources.ThemeChanged += Resources_ThemeChanged;
CommandBindings.Add(new CommandBinding(SystemCommands.CloseWindowCommand, CloseWindow));
CommandBindings.Add(new CommandBinding(SystemCommands.MaximizeWindowCommand, MaximizeWindow,
CanResizeWindow));
CommandBindings.Add(new CommandBinding(SystemCommands.MinimizeWindowCommand, MinimizeWindow,
CanMinimizeWindow));
CommandBindings.Add(new CommandBinding(SystemCommands.RestoreWindowCommand, RestoreWindow,
CanResizeWindow));
}

private void Resources_ThemeChanged(ThemeType currentTheme)

var isDark = currentTheme == ThemeType.Dark ? true : false;
var source = (HwndSource)PresentationSource.FromVisual(this);
Win32.EnableDarkModeForWindow(source, isDark);
}

public override void OnApplyTemplate()

base.OnApplyTemplate();
_windowStyle = WindowStyle;
_titleBarIcon = GetTemplateChild(TitleBarIcon) as Button;
if (_titleBarIcon != )

_titleBarIcon.MouseDoubleClick -= Icon_MouseDoubleClick;
_titleBarIcon.MouseDoubleClick += Icon_MouseDoubleClick;
}
_highTitleMaximizeButton = GetTemplateChild(HighTitleMaximizeButton) as Button;
_highTitleRestoreButton = GetTemplateChild(HighTitleRestoreButton) as Button;
_titleBarMaximizeButton = GetTemplateChild(TitleBarMaximizeButton) as Button;
_titleBarRestoreButton = GetTemplateChild(TitleBarRestoreButton) as Button;
}

private void Icon_MouseDoubleClick(object sender, MouseButtonEventArgs e)

if (e.ChangedButton == MouseButton.Left)
Close();
}

publicdouble TitleHeight

get => (double)GetValue(TitleHeightProperty);
set => SetValue(TitleHeightProperty, value);
}

publicbool NoChrome

get => (bool)GetValue(NoChromeProperty);
set => SetValue(NoChromeProperty, value);
}

publicobject TitleBar

get => (object)GetValue(TitleBarProperty);
set => SetValue(TitleBarProperty, value);
}

public Brush TitleBackground

get => (Brush)GetValue(TitleBackgroundProperty);
set => SetValue(TitleBackgroundProperty, value);
}

public TitleBarMode TitleBarMode

get => (TitleBarMode)GetValue(TitleBarModeProperty);
set => SetValue(TitleBarModeProperty, value);
}

protected override void OnSourceInitialized(EventArgs e)

base.OnSourceInitialized(e);
hWnd = new WindowInteropHelper(this).Handle;
HwndSource.FromHwnd(hWnd).AddHook(WindowProc);
if (TitleBarMode == TitleBarMode.Normal)
TitleHeight = SystemParameters2.Current.WindowNonClientFrameThickness.Top;
}

protected override void OnContentRendered(EventArgs e)

base.OnContentRendered(e);
if (SizeToContent == SizeToContent.WidthAndHeight)
InvalidateMeasure();
}

region Window Commands

private void CanResizeWindow(object sender, CanExecuteRoutedEventArgs e)

e.CanExecute = ResizeMode == ResizeMode.CanResize || ResizeMode == ResizeMode.CanResizeWithGrip;
}

private void CanMinimizeWindow(object sender, CanExecuteRoutedEventArgs e)

e.CanExecute = ResizeMode != ResizeMode.NoResize;
}

private void CloseWindow(object sender, ExecutedRoutedEventArgs e)

SystemCommands.CloseWindow(this);
}

private void MaximizeWindow(object sender, ExecutedRoutedEventArgs e)

if (WindowState == WindowState.Normal)

WindowStyle = WindowStyle.SingleBorderWindow;
WindowState = WindowState.Maximized;
WindowStyle = WindowStyle.;
}
}

private void MinimizeWindow(object sender, ExecutedRoutedEventArgs e)

Win32.SendMessage(hWnd, WindowsMessageCodes.WM_SYSCOMMAND, new IntPtr(WindowsMessageCodes.SC_MINIMIZE), IntPtr.Zero);
}

private void RestoreWindow(object sender, ExecutedRoutedEventArgs e)

SystemCommands.RestoreWindow(this);
}

private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)

switch (msg)

case WindowsMessageCodes.WM_SYSCOMMAND:
if (wParam.ToInt32() == WindowsMessageCodes.SC_MINIMIZE)

_windowStyle = WindowStyle;
if (WindowStyle != WindowStyle.SingleBorderWindow)
WindowStyle = WindowStyle.SingleBorderWindow;
WindowState = WindowState.Minimized;
handled = true;
}
elseif (wParam.ToInt32() == WindowsMessageCodes.SC_RESTORE)

WindowState = WindowState.Normal;
WindowStyle = WindowStyle.;
if (WindowStyle. != _windowStyle)
WindowStyle = _windowStyle;
handled = true;
}
break;
case WindowsMessageCodes.WM_NCHITTEST:
case WindowsMessageCodes.WM_NCLBUTTONDOWN:
try

if (!OSVersionHelper.IsSnapLayoutSupported()
||
ResizeMode == ResizeMode.NoResize
||
ResizeMode == ResizeMode.CanMinimize)
break;
else

IntPtr result = IntPtr.Zero;
if (HandleSnapLayoutMessage(msg, lParam, ref result))

handled = true;
return result;
}
}
}
catch (OverflowException)

handled = true;
}
break;
}
return IntPtr.Zero;
}

private bool HandleSnapLayoutMessage(int msg, IntPtr lParam, ref IntPtr result)

Button button = TitleBarMode == TitleBarMode.Normal
? (WindowState != WindowState.Maximized ? _titleBarMaximizeButton : _titleBarRestoreButton)
: (WindowState != WindowState.Maximized ? _highTitleMaximizeButton : _highTitleRestoreButton);

if (button == || button.ActualWidth <= 0 || button.ActualHeight <= 0)
returnfalse;
var contentPresenter = button.Template.FindName(“PART_ContentPresenter”, button) as ContentPresenter;
var x = lParam.ToInt32() & 0xffff;
var y = lParam.ToInt32() >> 16;
var dpiX = OSVersionHelper.DeviceUnitsScalingFactorX;
var rect = new Rect(button.PointToScreen(new Point()), new Size(button.ActualWidth dpiX, button.ActualHeight dpiX));
var point = new Point(x, y);

if (msg == WindowsMessageCodes.WM_NCHITTEST && contentPresenter != )

if (!rect.Contains(point))

if(contentPresenter.Opacity != 0.7)
contentPresenter.Opacity = 0.7;
returnfalse;
}
contentPresenter.Opacity = 1;
result = new IntPtr(OSVersionHelper.HTMAXBUTTON);
}
elseif (msg == WindowsMessageCodes.WM_NCLBUTTONDOWN)

IInvokeProvider invokeProv = new ButtonAutomationPeer(button).GetPattern(PatternInterface.Invoke) as IInvokeProvider;
invokeProv?.Invoke();
}

returntrue;
}

private void ShowSystemMenu(object sender, ExecutedRoutedEventArgs e)

var element = e.OriginalSource as FrameworkElement;
if (element == )
return;

var point = WindowState == WindowState.Maximized
? new Point(0. element.ActualHeight)
: new Point(Left + BorderThickness.Left, element.ActualHeight + Top + BorderThickness.Top);
point = element.TransformToAncestor(this).Transform(point);
SystemCommands.ShowSystemMenu(this, point);
}

endregion
}
}

2. 修改 Window.xaml

<ContentControl
Margin=”5,0.0.0″
VerticalAlignment=”Center”
Content=”TemplateBinding Title}”
FontSize=”DynamicResource x:Static SystemFonts.CaptionFontSizeKey}}”
Foreground=”DynamicResource WD.WindowTextBrush}”
IsTabStop=”False” />
</StackPanel>
<StackPanel
Grid.Column=”1″
HorizontalAlignment=”Right”
VerticalAlignment=”Top”
shell:WindowChrome.IsHitTestVisibleInChrome=”True”
Orientation=”Horizontal”>
<StackPanel x:Name=”PART_TitleBarMinAndMax” Orientation=”Horizontal”>
<Button
x:Name=”PART_TitleBarMinimizeButton”
Padding=”0″
Command=”Binding Source=x:Static shell:SystemCommands.MinimizeWindowCommand}}”
IsTabStop=”False”

ToolTip=”Binding [Minimize], Source=x:Static resx:LanguageManager.Instance}}”>
<Grid HorizontalAlignment=”Center” VerticalAlignment=”Center”>
<Rectangle
Width=”10″
Height=”1″
Margin=”0.7,0.0″
VerticalAlignment=”Bottom”
Fill=”DynamicResource WD.WindowTextBrush}” />
</Grid>
</Button>
<Button
x:Name=”PART_TitleBarMaximizeButton”
Padding=”0″
Command=”Binding Source=x:Static shell:SystemCommands.MaximizeWindowCommand}}”
IsTabStop=”False”

ToolTip=”Binding [Maximize], Source=x:Static resx:LanguageManager.Instance}}”>
<Grid HorizontalAlignment=”Center” VerticalAlignment=”Center”>
<Path
Width=”10″
Height=”10″
HorizontalAlignment=”Center”
VerticalAlignment=”Center”
Data=”DynamicResource WD.WindowMaximizeGeometry}”
Fill=”DynamicResource WD.WindowTextBrush}”
Stretch=”Uniform”
UseLayoutRounding=”False” />
</Grid>
</Button>
<Button
x:Name=”PART_TitleBarRestoreButton”
Padding=”0″
Command=”Binding Source=x:Static shell:SystemCommands.RestoreWindowCommand}}”
IsTabStop=”False”

ToolTip=”Binding [Restore], Source=x:Static resx:LanguageManager.Instance}}”
Visibility=”Collapsed”>
<Grid HorizontalAlignment=”Center” VerticalAlignment=”Center”>
<Path
Width=”10″
Height=”10″
HorizontalAlignment=”Center”
VerticalAlignment=”Center”
Data=”DynamicResource WD.WindowRestoreGeometry}”
Fill=”DynamicResource WD.WindowTextBrush}”
Stretch=”Uniform”
UseLayoutRounding=”False” />
</Grid>
</Button>
</StackPanel>

<Button
Name=”PART_TitleBarCloseButton”
Command=”Binding Source=x:Static shell:SystemCommands.CloseWindowCommand}}”
IsTabStop=”False”

ToolTip=”Binding [Close], Source=x:Static resx:LanguageManager.Instance}}”>
<Path
Width=”10″
Height=”10″
HorizontalAlignment=”Center”
VerticalAlignment=”Center”
Data=”DynamicResource WD.WindowCloseGeometry}”
Fill=”DynamicResource WD.WindowTextBrush}”
Stretch=”Uniform” />
</Button>
</StackPanel>
</Grid>
</control:SmallPanel>
<control:SmallPanel
x:Name=”PART_HighTitleBar”
Grid.Row=”0″
Background=”TemplateBinding TitleBackground}”
Visibility=”Collapsed”>
<Grid
x:Name=”PART_GridChrome”
Height=”TemplateBinding TitleHeight}”
Margin=”10.0.0.0″>
<Grid.ColumnDefinitions>
<ColumnDefinition Width=”Auto” />
<ColumnDefinition Width=”” />
<ColumnDefinition Width=”Auto” MinWidth=”30″ />
</Grid.ColumnDefinitions>
<Image
Width=”23″
Height=”23″
VerticalAlignment=”Center”
RenderOptions.BitmapScalingMode=”HighQuality”
Source=”TemplateBinding Icon}”
Visibility=”TemplateBinding Icon,
Converter=StaticResource ObjectToVisibilityConverter}}” />
<TextBlock
x:Name=”PART_Title”
Grid.Column=”1″
Margin=”6,0″
VerticalAlignment=”Center”
FontSize=”DynamicResource WD.TitleFontSize}”
Foreground=”DynamicResource WD.WindowTextBrush}”
Text=”TemplateBinding Title}” />
<StackPanel
Grid.Column=”2″
Margin=”0.6″
shell:WindowChrome.IsHitTestVisibleInChrome=”True”
Orientation=”Horizontal”>
<StackPanel x:Name=”PART_MinAndMax” Orientation=”Horizontal”>
<Button
Name=”PART_MinimizeButton”
Padding=”0″
Command=”Binding Source=x:Static shell:SystemCommands.MinimizeWindowCommand}}”
IsTabStop=”False”

ToolTip=”Binding [Minimize], Source=x:Static resx:LanguageManager.Instance}}”>
<Grid HorizontalAlignment=”Center” VerticalAlignment=”Center”>
<Rectangle
x:Name=”MinimizeGlyph”
Width=”10″
Height=”1″
Margin=”0.7,0.0″
VerticalAlignment=”Bottom”
Fill=”DynamicResource WD.WindowTextBrush}” />
</Grid>
</Button>
<Button
x:Name=”PART_MaximizeButton”
Padding=”0″
Command=”Binding Source=x:Static shell:SystemCommands.MaximizeWindowCommand}}”
IsTabStop=”False”

ToolTip=”Binding [Maximize], Source=x:Static resx:LanguageManager.Instance}}”>
<Grid HorizontalAlignment=”Center” VerticalAlignment=”Center”>
<Path
Width=”10″
Height=”10″
HorizontalAlignment=”Center”
VerticalAlignment=”Center”
Data=”DynamicResource WD.WindowMaximizeGeometry}”
Fill=”DynamicResource WD.WindowTextBrush}”
Stretch=”Uniform”
UseLayoutRounding=”False” />
</Grid>
</Button>
<Button
x:Name=”PART_RestoreButton”
Padding=”0″
Command=”Binding Source=x:Static shell:SystemCommands.RestoreWindowCommand}}”
IsTabStop=”False”

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