WPF Borderless Window issues: Aero Snap & Maximizing

Easiest Full Solution

Hello, The following solution fixes all of the issues detailed in your question in the simplest manner possible, and works on Windows 10 using WPF and the latest version of the C# language and .NET framework. This is as of 3/15/2017. Please let me know if it stops working.

Step 1: To address issues 1, 2, and 4, within your <Window ... > </Window> tags in the XAML of your application, paste this in, at the top or bottom:

<WindowChrome.WindowChrome>    <WindowChrome CaptionHeight="35"/><WindowChrome.WindowChrome>

CaptionHeight is the desired height of your window dragging area.

Step 2: To address issue 3, you need to create your title bar and caption as well as the window controls. To do this, you simply need to give the desired title bar elements each a VerticalAlignment of Top, or put them into a grid with it's VerticalAlignment set to Top, which will do it for all of them, but make sure that their heights are not greater than the CaptionHeight property on the WindowChrome element declared in the XAML, from step 1. For all the buttons, you must assign them, or their container, the property WindowChrome.IsHitTestVisibleInChrome="True". Here is an example:

<Grid VerticalAlignment="Top" Background="White" Name="TitleBar" Height="35">    <Label Content="Borderless Window Test" VerticalAlignment="Center" HorizontalAlignment="Left"/>    <StackPanel WindowChrome.IsHitTestVisibleInChrome="True" VerticalAlignment="Center" HorizontalAlignment="Right" Orientation="Horizontal" Name="WindowControls">        <Button Height="35" Width="35" Content="-" Padding="0" Name="MinimizeButton"/>        <Button Height="35" Width="35" Content="+" Padding="0" Name="MaximizeButton"/>        <Button Height="35" Width="35" Content="x" Padding="0" Name="CloseButton"/>    </StackPanel></Grid>

Now, to add proper functionality to the window control buttons, within the MainWindow() constructor of your codebehind, the C# source code of your application, paste the following in, after the call to InitializeComponent();:

CloseButton.Click += (s, e) => Close();MaximizeButton.Click += (s, e) => WindowState = WindowState == WindowState.Normal ? WindowState.Maximized : WindowState.Normal;MinimizeButton.Click += (s, e) => WindowState = WindowState.Minimized;

Step 3: To address issues 5 and 6, you need to hook into WmGetMinMaxInfo. To do this, go to your codebehind, then copy and paste everything from this Pastebin into your Window class. Now, within your MainWindow() constructor, paste:

SourceInitialized += (s, e) =>{    IntPtr handle = (new WindowInteropHelper(this)).Handle;    HwndSource.FromHwnd(handle).AddHook(new HwndSourceHook(WindowProc));};

Via Project > Add References in the file menu, be sure to have references to:

System.ManagementSystem.Windows.InteropSystem.Security.PrincipalSystem.Runtime.InteropServicesMicrosoft.Win32

The best way to check is to click on the Assemblies tab in the top left, then select Framework, then use the search box in the top right corner of the window. Now add all of these usings (namespaces) to the top of your codebehind:

using System.Management;using System.Windows.Interop;using System.Security.Principal;using System.Runtime.InteropServices;using Microsoft.Win32;

That should cover everything. I hope this helps!

I just went through this entire thing myself. It was a real chore, because you have to manually account for so much. It's funny, we take so much for granted these days, with something as simple as how a basic window operates. But a look at this sample code that I am providing is a good indication of just how much really goes into this problem.

I hope this helps, as it took me a little time to get here myself.

MainWindow.Xaml

<Window x:Class="WpfApp1.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:WpfApp1"    Background="Transparent"    WindowStartupLocation="CenterScreen"    ResizeMode="CanResizeWithGrip"    AllowsTransparency="True"    WindowStyle="None"    mc:Ignorable="d"    Title="Test Window Behavior" Height="768" Width="1024" StateChanged="Window_StateChanged" PreviewMouseLeftButtonDown="Window_PreviewMouseLeftButtonDown"><Grid>    <DockPanel Grid.Column="1" Grid.Row="1">        <DockPanel x:Name="titleBar" Background="White" DockPanel.Dock="Top">            <Rectangle Width="32" Height="32" DockPanel.Dock="Left" Fill="Red" Margin="2"/>            <StackPanel Orientation="Horizontal" DockPanel.Dock="Right" Margin="2">                <!-- Minimize Button -->                <Border Width="24" Height="24" Margin="2" HorizontalAlignment="Right" MouseLeftButtonUp="OnMinimizeWindow" Grid.Column="2">                    <Border.Style>                        <Style TargetType="Border">                            <Setter Property="Background" Value="Transparent" />                            <Style.Triggers>                                <Trigger Property="IsMouseOver" Value="True">                                    <Setter Property="Background" Value="#FFD0D0D0" />                                </Trigger>                            </Style.Triggers>                        </Style>                    </Border.Style>                    <TextBlock FontSize="14" HorizontalAlignment="Center" VerticalAlignment="Center" Text="0" FontFamily="Webdings" />                </Border>                <!-- Maximize Button -->                <Border Width="24" Height="24" Margin="2" HorizontalAlignment="Right" MouseLeftButtonUp="OnMaximizeWindow" Grid.Column="3">                    <Border.Style>                        <Style TargetType="Border">                            <Setter Property="Background" Value="Transparent" />                            <Style.Triggers>                                <Trigger Property="IsMouseOver" Value="True">                                    <Setter Property="Background" Value="#FFD0D0D0" />                                </Trigger>                            </Style.Triggers>                        </Style>                    </Border.Style>                    <TextBlock x:Name="IsMaximized" FontSize="14" HorizontalAlignment="Center" VerticalAlignment="Center" FontFamily="Webdings">                        <TextBlock.Style>                            <Style TargetType="TextBlock">                                <Setter Property="Text" Value="1" />                                <Style.Triggers>                                    <DataTrigger Binding="{Binding Path=InternalWindowState, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}" Value="Maximized">                                        <Setter Property="Text" Value="2" />                                    </DataTrigger>                                </Style.Triggers>                            </Style>                        </TextBlock.Style>                    </TextBlock>                </Border>                <!-- Close Button -->                <Border Width="24" Height="24" Margin="2" HorizontalAlignment="Right" MouseLeftButtonUp="OnCloseWindow" Grid.Column="4">                    <Border.Style>                        <Style TargetType="Border">                            <Setter Property="Background" Value="Transparent" />                            <Style.Triggers>                                <Trigger Property="IsMouseOver" Value="True">                                    <Setter Property="Background" Value="Red" />                                </Trigger>                            </Style.Triggers>                        </Style>                    </Border.Style>                    <TextBlock FontSize="14" HorizontalAlignment="Center" VerticalAlignment="Center" Text="r" FontFamily="Webdings" />                </Border>            </StackPanel>            <Label MouseLeftButtonDown="OnDragMoveWindow" MouseDoubleClick="OnMaximizeWindow" Margin="8 0 0 0" FontSize="12" VerticalContentAlignment="Center" Content="{Binding Path=Title, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}, FallbackValue='Main Window'}" />        </DockPanel>        <Grid Background="White" DockPanel.Dock="Bottom" Height="32">            <Label VerticalContentAlignment="Center" Content="Statusbar Text Goes Here ..." />        </Grid>        <Grid>            <Grid.ColumnDefinitions>                <ColumnDefinition Width="100" />                <ColumnDefinition Width="*" />                <ColumnDefinition Width="100" />            </Grid.ColumnDefinitions>            <Grid.RowDefinitions>                <RowDefinition Height="100" />                <RowDefinition Height="*" />                <RowDefinition Height="100" />            </Grid.RowDefinitions>            <!-- Top 3 -->            <Border Background="Gray" Grid.Row="0" Grid.Column="0" />            <Border Background="Gray" Grid.Row="0" Grid.Column="1" BorderBrush="Black" BorderThickness="0 0 0 1" />            <Border Background="Gray" Grid.Row="0" Grid.Column="2" />            <!-- Middle 2 -->            <Border Background="Gray" Grid.Row="1" Grid.Column="0" BorderBrush="Black" BorderThickness="0 0 1 0" />            <Border Background="Gray" Grid.Row="1" Grid.Column="2" BorderBrush="Black" BorderThickness="1 0 0 0" />            <!-- Bottom 3 -->            <Border Background="Gray" Grid.Row="2" Grid.Column="0" />            <Border Background="Gray" Grid.Row="2" Grid.Column="1" BorderBrush="Black" BorderThickness="0 1 0 0" />            <Border Background="Gray" Grid.Row="2" Grid.Column="2" />        </Grid>    </DockPanel>    <Grid>        <Grid.Resources>            <Style TargetType="Thumb">                <Style.Setters>                    <Setter Property="Template">                        <Setter.Value>                            <ControlTemplate>                                <Border Background="Transparent" />                            </ControlTemplate>                        </Setter.Value>                    </Setter>                </Style.Setters>            </Style>        </Grid.Resources>        <Grid.ColumnDefinitions>            <ColumnDefinition Width="25" />            <ColumnDefinition Width="*" />            <ColumnDefinition Width="25" />        </Grid.ColumnDefinitions>        <Grid.RowDefinitions>            <RowDefinition Height="25" />            <RowDefinition Height="*" />            <RowDefinition Height="25" />        </Grid.RowDefinitions>        <!-- Top/Left -->        <DockPanel LastChildFill="False" Grid.Row="0" Grid.Column="0">            <Thumb DockPanel.Dock="Left" Width="4" Cursor="SizeNWSE" Tag="0" DragDelta="Thumb_DragDelta" />            <Thumb DockPanel.Dock="Top" Height="4" Cursor="SizeNWSE" Tag="0" DragDelta="Thumb_DragDelta" />        </DockPanel>        <!-- Top/Right -->        <DockPanel LastChildFill="False" Grid.Row="0" Grid.Column="2">            <Thumb DockPanel.Dock="Right" Width="4" Cursor="SizeNESW" Tag="0" DragDelta="Thumb_DragDelta" />            <Thumb DockPanel.Dock="Top" Height="4" Cursor="SizeNESW" Tag="0" DragDelta="Thumb_DragDelta" />        </DockPanel>        <!-- Bottom/Left -->        <DockPanel LastChildFill="False" Grid.Row="2" Grid.Column="0">            <Thumb DockPanel.Dock="Left" Width="4" Cursor="SizeNESW" Tag="1" DragDelta="Thumb_DragDelta" />            <Thumb DockPanel.Dock="Bottom" Height="4" Cursor="SizeNESW" Tag="1" DragDelta="Thumb_DragDelta" />        </DockPanel>        <!-- Bottom/Right -->        <DockPanel LastChildFill="False" Grid.Row="2" Grid.Column="2">            <Thumb DockPanel.Dock="Right" Width="4" Cursor="SizeNWSE" Tag="1" DragDelta="Thumb_DragDelta" />            <Thumb DockPanel.Dock="Bottom" Height="4" Cursor="SizeNWSE" Tag="1" DragDelta="Thumb_DragDelta" />        </DockPanel>        <!-- Left -->        <Thumb Grid.Row="1" Grid.Column="0" Width="4" Cursor="SizeWE" Tag="0" HorizontalAlignment="Left" DragDelta="Thumb_DragDelta" />        <!-- Top -->        <Thumb Grid.Row="0" Grid.Column="1" Height="4" Cursor="SizeNS" Tag="0" VerticalAlignment="Top" DragDelta="Thumb_DragDelta" />        <!-- Right -->        <Thumb Grid.Row="1" Grid.Column="2" Width="4" Cursor="SizeWE" Tag="1" HorizontalAlignment="Right" DragDelta="Thumb_DragDelta" />        <!-- Bottom -->        <Thumb Grid.Row="2" Grid.Column="1" Height="4" Cursor="SizeNS" Tag="1" VerticalAlignment="Bottom" DragDelta="Thumb_DragDelta" />    </Grid></Grid>

MainWindow.xaml.cs

using System;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Controls.Primitives;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace WpfApp1{    public partial class MainWindow : Window    {        #region --- Declarations ---        private Rect _location { get; set; }        #endregion        #region --- Constructors ---        public MainWindow()        {            InitializeComponent();        }        #endregion        #region --- Properties ---        private Rect DesktopArea        {            get            {                var c = System.Windows.Forms.Cursor.Position;                var s = System.Windows.Forms.Screen.FromPoint(c);                var a = s.WorkingArea;                return new Rect(a.Left, a.Top, a.Width, a.Height);            }        }        #endregion        #region --- Dependency Properties ---        public static readonly DependencyProperty InternalWindowStateProperty = DependencyProperty.Register("InternalWindowState", typeof(WindowState), typeof(MainWindow), new PropertyMetadata(WindowState.Normal, new PropertyChangedCallback(OnInternalWindowStateChanged)));        public WindowState InternalWindowState        {            get { return (WindowState)GetValue(InternalWindowStateProperty); }            set { SetValue(InternalWindowStateProperty, value); }        }        private static void OnInternalWindowStateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)        {            MainWindow instance = (MainWindow)d;            instance.SetInternalWindowState((WindowState)e.NewValue);        }        #endregion        #region --- Private Methods ---        private void StoreLocation()        {            _location = new Rect(this.Left, this.Top, this.Width, this.Height);        }        private void RestoreLocation()        {            this.Width = _location.Width;            this.Height = _location.Height;            this.Top = _location.Top >= 0 ? _location.Top : 0;            this.Left = _location.Left;        }        private void SetMaximizedState()        {            this.Width = DesktopArea.Width;            this.Height = DesktopArea.Height;            this.Top = DesktopArea.Top;            this.Left = DesktopArea.Left;        }        private void SetInternalWindowState(WindowState state)        {            InternalWindowState = state;            switch (InternalWindowState)            {                case WindowState.Normal:                    this.WindowState = WindowState.Normal;                    RestoreLocation();                    break;                case WindowState.Maximized:                    this.WindowState = WindowState.Normal;                    SetMaximizedState();                    break;                case WindowState.Minimized:                    this.WindowState = WindowState.Minimized;                    break;            }        }        #endregion        #region --- Sizing Routines ---         private void Thumb_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)        {            Thumb thumb = (Thumb)sender;            int tag = Convert.ToInt32(thumb.Tag);            if (thumb.Cursor == Cursors.SizeWE) HandleSizeWE(tag, e);            if (thumb.Cursor == Cursors.SizeNS) HandleSizeNS(tag, e);            if (thumb.Cursor == Cursors.SizeNESW) HandleSizeNESW(tag, e);            if (thumb.Cursor == Cursors.SizeNWSE) HandleSizeNWSE(tag, e);        }        private void HandleSizeNWSE(int tag, DragDeltaEventArgs e)        {            if (tag == 0)            {                this.Top += e.VerticalChange;                this.Height -= e.VerticalChange;                this.Left += e.HorizontalChange;                this.Width -= e.HorizontalChange;            }            else            {                this.Width += e.HorizontalChange;                this.Height += e.VerticalChange;            }        }        private void HandleSizeNESW(int tag, DragDeltaEventArgs e)        {            if (tag == 0)            {                this.Top += e.VerticalChange;                this.Height -= e.VerticalChange;                this.Width += e.HorizontalChange;            }            else            {                this.Left += e.HorizontalChange;                this.Width -= e.HorizontalChange;                this.Height += e.VerticalChange;            }        }        private void HandleSizeNS(int tag, DragDeltaEventArgs e)        {            if (tag == 0)            {                this.Top += e.VerticalChange;                this.Height -= e.VerticalChange;            }            else                this.Height += e.VerticalChange;        }        private void HandleSizeWE(int tag, DragDeltaEventArgs e)        {            if (tag == 0)            {                this.Left += e.HorizontalChange;                this.Width -= e.HorizontalChange;            }            else                this.Width += e.HorizontalChange;        }        #endregion        #region --- Event Handlers ---        private void OnDragMoveWindow(Object sender, MouseButtonEventArgs e)        {            if (this.InternalWindowState == WindowState.Maximized)            {                var c = System.Windows.Forms.Cursor.Position;                this.InternalWindowState = WindowState.Normal;                this.Height = _location.Height;                this.Width = _location.Width;                this.Top = c.Y - (titleBar.ActualHeight / 2);                this.Left = c.X - (_location.Width / 2);            }            this.DragMove();        }        private void OnMaximizeWindow(Object sender, MouseButtonEventArgs e)        {            if (this.InternalWindowState == WindowState.Maximized)                this.InternalWindowState = WindowState.Normal;            else                this.InternalWindowState = WindowState.Maximized;        }        private void OnMinimizeWindow(Object sender, MouseButtonEventArgs e)        {            this.InternalWindowState = WindowState.Minimized;        }        private void OnCloseWindow(Object sender, MouseButtonEventArgs e)        {            Application.Current.Shutdown();        }        private void Window_StateChanged(object sender, EventArgs e)        {            if (this.WindowState == WindowState.Maximized)            {                this.InternalWindowState = WindowState.Maximized;            }        }        private void Window_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)        {            if (this.InternalWindowState != WindowState.Maximized)                StoreLocation();        }        #endregion    }}

For Point number 5, use this:

public WindowName() // Constructor for your window{this.MaxHeight = SystemParameters.WorkArea.Height;this.MaxWidth = SystemParameters.WorkArea.Width;}

This will ensure that the window will not overlap the taskbar when maximized.