/// <summary>
/// Asynchronously wait for the Chromium widget window to be created for the given ChromiumWebBrowser,
/// and when created hook into its Windows message loop.
/// </summary>
/// <param name="browser">The browser to intercept Windows messages for.</param>
/// <param name="forwardAction">This action will be called whenever a Windows message is received.</param>
internal static void SetupLoop(ChromiumWebBrowser browser, Action <Message> forwardAction)
{
Task.Factory.StartNew(() =>
{
try
{
bool foundWidget = false;
while (!foundWidget)
{
browser.Invoke((Action)(() =>
{
IntPtr chromeWidgetHostHandle;
if (ChromeWidgetHandleFinder.TryFindHandle(browser, out chromeWidgetHostHandle))
{
foundWidget = true;
new ChromeWidgetMessageInterceptor(browser, chromeWidgetHostHandle, forwardAction);
}
else
{
// Chrome hasn't yet set up its message-loop window.
Thread.Sleep(10);
}
}));
}
}
catch
{
// Errors are likely to occur if browser is disposed, and no good way to check from another thread
}
});
}
/// <summary>
/// Chrome's message-loop Window isn't created synchronously, so this may not find it.
/// If so, you need to wait and try again later.
/// </summary>
public static bool TryFindHandle(ChromiumWebBrowser browser, out IntPtr chromeWidgetHostHandle)
{
var browserHandle = browser.Handle;
var windowHandleInfo = new ChromeWidgetHandleFinder(browserHandle);
const string chromeWidgetHostClassName = "Chrome_RenderWidgetHostHWND";
chromeWidgetHostHandle = windowHandleInfo.FindDescendantByClassName(chromeWidgetHostClassName);
return(chromeWidgetHostHandle != IntPtr.Zero);
}
