如何创建一个 WPF 窗口没有一个边框，可以调整大小只通过一个抓地力？

如果你在 WPF Window上设置 ResizeMode="CanResizeWithGrip"，那么右下角会显示一个调整大小的握把，如下所示:

如果你也设置了 WindowStyle="None"，那么标题栏会消失，但是灰色的斜边会一直保持，直到你设置了 ResizeMode="NoResize"。不幸的是，随着这些属性的组合设置，调整大小的握把也消失了。

我已经通过自定义 Style覆盖了 Window的 ControlTemplate。我想指定自己的窗口边界，我不需要用户能够调整大小的窗口从所有四个方面，但我确实需要一个调整大小的抓地力。

有人能详细说明一个简单的方法来满足所有这些标准吗？

  1. 不要 在 Window上有一个边框，除了我在 ControlTemplate中指定的边框。
  2. 在右下角有一个调整尺寸的工作夹。
  3. 不要 有标题栏。
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最佳答案

If you set the AllowsTransparency property on the Window (even without setting any transparency values) the border disappears and you can only resize via the grip.

<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="640" Height="480"
WindowStyle="None"
AllowsTransparency="True"
ResizeMode="CanResizeWithGrip">


<!-- Content -->


</Window>

Result looks like:

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Sample here:

<Style TargetType="Window" x:Key="DialogWindow">
<Setter Property="AllowsTransparency" Value="True"/>
<Setter Property="WindowStyle" Value="None"/>
<Setter Property="ResizeMode" Value="CanResizeWithGrip"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Border BorderBrush="Black" BorderThickness="3" CornerRadius="10" Height="{TemplateBinding Height}"
Width="{TemplateBinding Width}" Background="Gray">
<DockPanel>
<Grid DockPanel.Dock="Top">
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition Width="50"/>
</Grid.ColumnDefinitions>
<Label Height="35" Grid.ColumnSpan="2"
x:Name="PART_WindowHeader"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"/>
<Button Width="15" Height="15" Content="x" Grid.Column="1" x:Name="PART_CloseButton"/>
</Grid>
<Border HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
Background="LightBlue" CornerRadius="0,0,10,10"
Grid.ColumnSpan="2"
Grid.RowSpan="2">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="20"></RowDefinition>
</Grid.RowDefinitions>
<ResizeGrip Width="10" Height="10" Grid.Column="1" VerticalAlignment="Bottom" Grid.Row="1"/>
</Grid>
</Border>
</DockPanel>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
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While the accepted answer is very true, just want to point out that AllowTransparency has some downfalls. It does not allow child window controls to show up, ie WebBrowser, and it usually forces software rendering which can have negative performance effects.

There is a better work around though.

When you want to create a window with no border that is resizeable and is able to host a WebBrowser control or a Frame control pointed to a URL you simply couldn't, the contents of said control would show empty.

I found a workaround though; in the Window, if you set the WindowStyle to None, ResizeMode to NoResize (bear with me, you will still be able to resize once done) then make sure you have UNCHECKED AllowsTransparency you will have a static sized window with no border and will show the browser control.

Now, you probably still want to be able to resize right? Well we can to that with a interop call:

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);


[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();


//Attach this to the MouseDown event of your drag control to move the window in place of the title bar
private void WindowDrag(object sender, MouseButtonEventArgs e) // MouseDown
{
ReleaseCapture();
SendMessage(new WindowInteropHelper(this).Handle,
0xA1, (IntPtr)0x2, (IntPtr)0);
}


//Attach this to the PreviewMousLeftButtonDown event of the grip control in the lower right corner of the form to resize the window
private void WindowResize(object sender, MouseButtonEventArgs e) //PreviewMousLeftButtonDown
{
HwndSource hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource;
SendMessage(hwndSource.Handle, 0x112, (IntPtr)61448, IntPtr.Zero);
}

And voila, A WPF window with no border and still movable and resizable without losing compatibility with with controls like WebBrowser

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I was trying to create a borderless window with WindowStyle="None" but when I tested it, seems that appears a white bar in the top, after some research it appears to be a "Resize border", here is an image (I remarked in yellow):

The Challenge

After some research over the internet, and lots of difficult non xaml solutions, all the solutions that I found were code behind in C# and lots of code lines, I found indirectly the solution here: Maximum custom window loses drop shadow effect

<WindowChrome.WindowChrome>
<WindowChrome
CaptionHeight="0"
ResizeBorderThickness="5" />
</WindowChrome.WindowChrome>

Note : You need to use .NET 4.5 framework, or if you are using an older version use WPFShell, just reference the shell and use Shell:WindowChrome.WindowChrome instead.

I used the WindowChrome property of Window, if you use this that white "resize border" disappears, but you need to define some properties to work correctly.

CaptionHeight: This is the height of the caption area (headerbar) that allows for the Aero snap, double clicking behaviour as a normal title bar does. Set this to 0 (zero) to make the buttons work.

ResizeBorderThickness: This is thickness at the edge of the window which is where you can resize the window. I put to 5 because i like that number, and because if you put zero its difficult to resize the window.

After using this short code the result is this:

The Solution

And now, the white border disappeared without using ResizeMode="NoResize" and AllowsTransparency="True", also it shows a shadow in the window.

Later I will explain how to make to work the buttons (I didn't used images for the buttons) easily with simple and short code, Im new and i think that I can post to codeproject, because here I didn't find the place to post the tutorial.

Maybe there is another solution (I know that there are hard and difficult solutions for noobs like me) but this works for my personal projects.

Here is the complete code

<Window x:Class="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:Concursos"
mc:Ignorable="d"
Title="Concuros" Height="350" Width="525"
WindowStyle="None"
WindowState="Normal"
ResizeMode="CanResize"
>
<WindowChrome.WindowChrome>
<WindowChrome
CaptionHeight="0"
ResizeBorderThickness="5" />
</WindowChrome.WindowChrome>


<Grid>


<Rectangle Fill="#D53736" HorizontalAlignment="Stretch" Height="35" VerticalAlignment="Top" PreviewMouseDown="Rectangle_PreviewMouseDown" />
<Button x:Name="Btnclose" Content="r" HorizontalAlignment="Right" VerticalAlignment="Top" Width="35" Height="35" Style="{StaticResource TempBTNclose}"/>
<Button x:Name="Btnmax" Content="2" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,0,35,0" Width="35" Height="35" Style="{StaticResource TempBTNclose}"/>
<Button x:Name="Btnmin" Content="0" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,0,70,0" Width="35" Height="35" Style="{StaticResource TempBTNclose}"/>


</Grid>

Thank you!

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I was having difficulty getting the answer by @fernando-aguirre using WindowChrome to work. It was not working in my case because I was overriding OnSourceInitialized in the MainWindow and not calling the base class method.

protected override void OnSourceInitialized(EventArgs e)
{
ViewModel.Initialize(this);
base.OnSourceInitialized(e); // <== Need to call this!
}

This stumped me for a very long time.


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