How to create a WPF Window without a border that can be resized via a grip only?

Question

If you set ResizeMode="CanResizeWithGrip" on a WPF Window then a resize grip is shown in the lower right corner, as below:

If you set WindowStyle="None" as well the title bar disappears but the grey bevelled edge remains until you set ResizeMode="NoResize". Unfortunately, with this combination of properties set, the resize grip also disappears.

I have overridden the Window's ControlTemplate via a custom Style. I want to specify the border of the window myself, and I don't need users to be able to resize the window from all four sides, but I do need a resize grip.

Can someone detail a simple way to meet all of these criteria?

1. Do not have a border on the Window apart from the one I specify myself in a ControlTemplate.
2. Do have a working resize grip in the lower right corner.
3. Do not have a title bar.

Answer 1

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:

Answer 2

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):

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:

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!