Wpf scale window content

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VS2017, .Net 4.61

I'm writing an app that contains two WebBrowser controls. Each WebBRowser control is pointed to the same site, but on different servers (a pair of pi-hole DNS servers).

I want to scale the content of the entire window to fit the window size. I've tried sing a Viewbox and a RenderTransform, but the WebBrowser control ignores the scaling and still appears to report the size of the control to the web site (which is mobile enabled, BTW).

What I have tried:

0) Putting the WebBrowser into a ViewBox container with Stretch="Fill"

1) Setting the RenderTransform for the WebBrowser control

2) Setting the RenderTransform for the parent Grid control

Posted 30-Sep-18 5:01am

#realJSOP

Updated 30-Sep-18 13:22pm

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Gerry Schmitz · Answer 1 · 2018-09-30T06:54:00

It "scales" what it can:

<Window x:Class="WpfApp3.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:WpfApp3"
        mc:Ignorable="d"
        Title="MainWindow"
        WindowStartupLocation="CenterScreen"
        Height="450"
        Width="800">
   <Grid>
      <Grid.ColumnDefinitions>
         <ColumnDefinition Width="*" />
         <ColumnDefinition Width="*" />
      </Grid.ColumnDefinitions>

      <WebBrowser Source="http://msdn.com" />
      <WebBrowser Grid.Column="1"
                  Source="http://msdn.com" />
   </Grid>
</Window>

Graeme_Grant · Answer 2 · 2018-09-30T13:23:00

Solution 2

Hi John, this may help: c# - WPF Web Browser Control and DPI Scaling - Stack Overflow[^]

Posted 30-Sep-18 13:23pm

Graeme_Grant

Comments

#realJSOP 30-Sep-18 20:33pm

I already found that. :(

The solution discussed there is only viable for win8 and higher.

I also looked at using a winforms app and winforms interop, but the winforms web browser control is not possible because addeventlistener isn’t supported.

I think I’m just gonna have to deal with the inability to scale a web browser control.

Graeme_Grant 1-Oct-18 2:26am

Yes, I found similar ... The WPF web browser is actually the same one used with WinForms. Have you looked at CefSharp - Fast web browser for WinForms and WPF Apps[^]?

#realJSOP 1-Oct-18 5:10am

I don't think they are the same. The WPF version works fine, but the WinForms version complains about the javascript function "addEventListener". I know about the CEF thing, but haven't tried it yet.

Graeme_Grant 1-Oct-18 5:22am

for Winforms you use a shim, for WPF you don't ... this could be why... I also read it somewhere from one of the MS devs... can't remember where ...

Richard Deeming 3-Oct-18 13:46pm

Graeme is correct - the WPF control is a thin wrapper around the ActiveX control, which is why it doesn't respect the WPF transforms.
Source code[^]

It's also going to be stuck in IE7 mode by default, unless you change the registry on every computer where your application runs[^].

#realJSOP 3-Oct-18 14:20pm

I already did the registry hack thing, but that didn't resolve the javascript error i'm getting, but the wpf version is fine in that regard.

I'm trying to get the CEF library to work, but all I'm getting so far is an empty black window.

Graeme_Grant 3-Oct-18 14:23pm

I have not used the CEF lib, so I can't help without learning it...

Side note: Microsoft is aware the control needs updating but the version of the framework required won't be suitable: Bringing a modern WebView to your .NET WinForms and WPF Apps - Microsoft Edge Dev BlogMicrosoft Edge Dev Blog[^]

#realJSOP 3-Oct-18 15:17pm

Looks like it doesn't work on Win7 (probably because it's Edge instead of IE). :/

Richard Deeming 3-Oct-18 14:29pm

That's odd - everything I've seen suggests it's rather difficult to suppress script errors in the WPF version, since they removed the SuppressScriptErrors property from the WinForms version.

Did you perhaps only do the registry hack for the WPF version, and not the WinForms version? Or maybe it was a 32-bit / 64-bit issue?

#realJSOP 3-Oct-18 14:42pm

I never saw any indications that the reg hack needed to be done for each platform.

Richard Deeming 3-Oct-18 14:47pm

It depends on whether you add the key to HKCU or HKLM:

https://blogs.msdn.microsoft.com/patricka/2015/01/12/controlling-webbrowser-control-compatibility/[^]
If you add to the current user HKCU hive, you don’t need to worry about “bitness” of your OS or application. However, if you add the key to the local machine hive, you need to ... add the key to the correct registry location on a Windows 64-bit machine. On a 64-bit OS, 32-bit applications run in the WOW64 subsystem. For 32-bit apps, WOW64 redirects registry calls to a separate location for certain keys. The FEATURE_BROWSER_EMULATION key is redirected. Therefore, on a 64-bit OS, a 32-bit application's value needs to be placed in HKLM\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION.

#realJSOP 3-Oct-18 15:07pm

who the f*ck is in charge in redmond? Beavis, or Butthead?

Richard Deeming 3-Oct-18 15:12pm

Or possibly Afroman[^]. :)