问题
When I create a windowless Silverlight app and run it on Firefox, wrong mouse positions are reported. There is a vertical offset between the actual mouse position and what the application responds to.
I also tagged this question with Flash because my research shows that this problem also occurs with Flash (see links below).
To reproduce:
Step 1: Create a new Silverlight application.
Step 2: Inside the grid of MainApp.xaml add the following:
<HyperlinkButton NavigateUri="http://google.com" VerticalAlignment="Center" HorizontalAlignment="Center">GOOGLE</HyperlinkButton>
Step 3: In SilverApplicationXTestPage.aspx (in the web project) add the following parameter to the Silverlight object:
<param name="windowless" value="true" />
Now run the silverlight application. When you hover the link it doesn't get underlined. Now slowly move the mouse up until at a certain offset above the link it will get highlighted.
This problem doesn't happen if you do one of the following:
- Switch Firefox into full screen mode (it seems that the top bar is the cause for the offset, so when it's not visible there is no offset).
- Do not use Silverlight in a windowless mode.
- Use any other browser.
I'm using Silverlight 4 on Firefox 8.0 on Windows 7.
This seems like an old problem that affects not just Silverlight, but also Flash.
In my research I came across the following suggested workarounds, non of which worked for me:
- Do not use overflow in css.
- Use css to set html margin of 1px.
- Do not use iframe (but the reproduction steps above do not use an iframe anyway).
As I mentioned none of the above workarounds seem to work.
Here are some references to mentions of this problem or similar:
http://forums.silverlight.net/t/161640.aspx/1/10
https://bugzilla.mozilla.org/show_bug.cgi?id=362193
http://forums.silverlight.net/t/94583.aspx/2/10#
https://bugzilla.mozilla.org/show_bug.cgi?id=536429
Does anyone know how to overcome this? Any workaround? I'm desperate!
回答1:
I found this: http://support.mozilla.org/en-US/questions/795168.
"Enabling the plugin-container.exe in about:config (dom.ipc.plugins.enabled) fixes the mouse issue but then Silverlight plugin pop-ups (webcam/microphone permission for example) freeze the browser."
I didn't see the problem with the popup (a copy permissions) after changing the config.
Making it full-screen also helped before I made this config change.
This requires the user to change their browser setting, which is not ideal.
This is similar to this question: Silverlight- bad mouse position when embedded in html page when Firefox has zoom
来源：https://stackoverflow.com/questions/8236746/windowless-silverlight-and-flash-app-on-firefox-wrong-mouse-positions-report