Develop Reference

On Windows 10 (1803), all applications lost touch or stylus if a WPF transparent window covers on them

If I create a new WPF application with a simple empty window like the code shown below, I find that all applications which are covered by the WPF app lost touch or stylus reaction. This can only be reproduced when Windows 10 is upgraded to 1803 (10.0.17134.0).
<Window x:Class="TheWPFCoveringWindow.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowStyle="None" WindowState="Maximized"
AllowsTransparency="True" Background="Transparent"
Topmost="True">
<Button Content="Test" Width="200" Height="100" />
</Window>
I wrote another WPF application to find out what happened. So I add a StylusDown event to the Window like the code shown below:
// This code is in another WPF application.
private void OnStylusDown(object sender, StylusDownEventArgs e)
{
// Set a breakpoint here.
}
But the breakpoint never reached until I closed the transparent WPF window which is on top.
I pushed the very simple code to GitHub: dotnet-campus/TouchIssueOnWindows10.0.17134. Cloning it might help a little.
Why does this happen and how to solve it? Any reply is appreciated.

Updated
Microsoft has fixed this issue in .NET Framework August 2018 Preview of Quality Rollup.
August 30, 2018—KB4346783 (OS Build 17134.254)
Addresses an issue where touch and mouse events were handled differently in Windows Presentation Foundation (WPF) applications that have a transparent overlay window.
Original
After a whole week's debugging, I finally find out the solution.
Just add a ResizeMode="NoResize" property for the Window as the code shown below:
<Window x:Class="TheWPFCoveringWindow.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowStyle="None" WindowState="Maximized"
AllowsTransparency="True" ResizeMode="NoResize"
Background="Transparent" Topmost="True">
<Button Content="Test" Width="200" Height="100" />
</Window>
#lindexi has posted this issue and this solution into his post. If you want more information about this issue, read win10 17025 touch bug - lindexi for more details. (This post is written in multiple languages, so you'll miss nothing even if you ignore the unknown characters.)
Actually, I still can't figure out why this property helps.
Could anyone explain the reason for this issue?

UWP Window content doe not resize with window

I started to develop my first UWP App (just for fun). While debugging I noticed that the content would not adapt correctly when resizing the window. I started over with an empty app to see, if it was a general problem: it is.
TL;DR:
Why does this happen when resizing the window larger (beyond 1246x936 px)? Notice the issue on the very right.
That's the XAML code:
<Page
x:Class="App2.MainPage"
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:local="using:App2"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
mc:Ignorable="d">
<Grid Background="White">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="3*" />
</Grid.ColumnDefinitions>
<Grid Grid.Column="0" Background="Blue" />
<Grid Grid.Column="1" Background="Red" />
</Grid>
</Page>

Little late but for posterity as this issue still comes up:
This behavior is most likely related to UWP and your video drivers. I have had this issue and it also extended into official Microsoft Windows Store UWP apps (Weather, Calc, etc) verifying it was not something I caused.
If you're lucky and have video driver updates, install them and it will likely fix the issue (it did for me on two different computers, one with an AMD card the other with Intel graphics). If your video drivers are out of support there may not be a path forward (although the app would work on workstations whose drivers did render it correctly).
There are a few tips on this thread that -may- work for workarounds for yourself (but aren't ideal if you're distributing your program and actually need it to render consistently).
https://superuser.com/questions/1376099/windows-10-uwp-not-rendering-fully
Run Performance Options (SystemPropertiesPerformance.exe) and uncheck "Show window contents while dragging". Then reboot.
Resize the window, then close and reopen the application, and it might then be of the right size.

What is the equivalent way to use Bitmap,Graphics,PictureBox & BitmapCopy() in WPF?

I'll try to explain my problem clearly.
I have a working code in WinForms that has a Board (PictureBox) that shows an image thats generated from a list of users controls (win-forms) by the function UserControl.BitmapCopy() for each user control.
This process begins with a blank image (Graphic type), and for each user control I draw it in a specific location with the function BitmapCopy() of the user control.
The result is an image that looks like a real form (with buttons,labels,etc.), but it’s just an image.
Then I show this image in a picture Box.
Now I need to implement this code in WPF, but I can’t generate an image of each user control with BitmapCopy().
I found this code that does it, so now I can generate a bitmap for each user control, but I don’t know what is the best way to create the Big Board that eventually shows a bitmap that has all the user controls images inside it, in different locations.
I would appreciate any help.

This is the equivalent in WPF:
<Window x:Class="MiscSamples.VisualBrush"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="VisualBrush" Height="300" Width="300" x:Name="Window">
<StackPanel>
<TextBlock Text="Hi, Im a Window!"/>
<TextBox Text="This is a TextBox"/>
<Slider Width="200"/>
</StackPanel>
<Window.ToolTip>
<ToolTip DataContext="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}">
<Grid Height="400" Width="400">
<Grid.Background>
<VisualBrush Visual="{Binding}"/>
</Grid.Background>
</Grid>
</ToolTip>
</Window.ToolTip>
</Window>
The Window's ToolTip consists of a grid painted with VisualBrush whose Visual is the Window itself. It looks like this:
As you can see, Exactly 0 lines of C# code are required to achieve the same in WPF.

How to change maximize button color/texture

Is there any way to change the Minimize button, Maximize button, WPF window frame/border ect. using styles in the xaml?

These buttons are part of the Window Chrome, and therefore are supposed to be left for the user to decide on how they look (Windows has options for changing the color of the chrome). So if you want to take control of the Chrome, it is not as simple as a window style.
You can use the WindowStyle property to get rid of them, or make the window a Dialog-type window, but for more control, you'll need to get into creating custom chrome for your window.
If you want to go down this path, it is definitely possible, but you'll need to look at information about creating a custom chrome for your window. Here are a couple resources, but do your research and see which of these, or what other resources best meet your needs:
Code Project Library
Stack Overflow Answer w/ Links
MSDN Blog

You can remove the default Windows chrome with WindowStyle="None" and ResizeMode="NoResize" and then create whatever borders/buttons you like. E.g.
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowStyle="None"
ResizeMode="NoResize"
BorderBrush="Blue"
BorderThickness="5">
<StackPanel Orientation="Horizontal"
VerticalAlignment="Top"
HorizontalAlignment="Right"
Height="20" >
<Button Content="Minimize" />
<Button Content="Restore" />
<Button Content="Close" />
</StackPanel>
</Window>

Using ICSharpCode.AvalonEdit on .Net 3.5?

I'm trying to use the ICSharpCode.AvalonEdit.TextEditor control from the SharpDevelop 4.0 project in a WPF app that I'm building, but I can't seem to get it to work.
I checked out a copy of the source code from svn://svnmirror.sharpdevelop.net/sharpdevelop/trunk/SharpDevelop/src/Libraries/AvalonEdit at revision 4304. Then, I built the project using Visual Studio 2008 SP1, which succeeded without errors.
I then created a blank new WPF project, added the build DLL to the toolbox and dropped the TextEditor control onto the default empty window, like so:
<Window x:Class="AvalonEditTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:avalonedit="http://icsharpcode.net/sharpdevelop/avalonedit"
Title="Window1" Height="300" Width="300" >
<Grid x:Name="LayoutRoot">
<avalonedit:TextEditor Name="textEditor" />
</Grid>
</Window>
However, when I run the project, the form comes up completely blank. No caret, the mouse cursor stays the default pointer, and the window does not respond to keypresses.
Am I missing something, or is AvalonEdit just a little broken?
[EDIT: I'm starting to think it might be related to my specific setup. I'm running the 64-bit Windows 7 RC. Might that have something to do with it? I've tried building it for x86 only, made no difference.]

Are you sure your namespace declaration is correct?
You can try something like this:
<Window x:Class="Editor.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300"
xmlns:e="clr-namespace:ICSharpCode.AvalonEdit;assembly=ICSharpCode.AvalonEdit">
<Grid>
<e:TextEditor x:Name="Editor" WordWrap="True" Height="200">
</e:TextEditor>
</Grid>
</Window>
I was able to get it to work without any issues.

The AvalonEdit TextEditor is just a view for a TextDocument model.
The problem was that a new AvalonEdit instance didn't start connected to any model instance, so there wasn't anything to edit.
The reason the code from statictype worked was that he didn't use <avalonedit:TextEditor/>, but <avalonedit:TextEditor></avalonedit:TextEditor>. This will assign an empty string to the Text property, which caused the editor to implicitly create a new document.
But this isn't relevant with recent AvalonEdit versions anymore, the editor will now always create a new TextDocument.

This works for me with the latest build
<DockPanel LastChildFill="True">
<avalonedit:TextEditor
HorizontalAlignment="Stretch"
Name="textEditor1"
VerticalAlignment="Stretch" />
</DockPanel>