/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (components != null)
{
components.Dispose();
components = null;
}
if (messageInterceptor != null)
{
messageInterceptor.ReleaseHandle();
messageInterceptor = null;
}
}
base.Dispose(disposing);
}
/// <summary>
/// The ChromiumWebBrowserControl does not fire MouseEnter/Move/Leave events, because Chromium handles these.
/// This method provides a demo of hooking the Chrome_RenderWidgetHostHWND handle to receive low level messages.
/// You can likely hook other window messages using this technique, drag/drog etc
/// </summary>
private void SetupMessageInterceptor()
{
if (messageInterceptor != null)
{
messageInterceptor.ReleaseHandle();
messageInterceptor = null;
}
Task.Run(async() =>
{
try
{
while (true)
{
IntPtr chromeWidgetHostHandle;
if (ChromiumRenderWidgetHandleFinder.TryFindHandle(Browser, out chromeWidgetHostHandle))
{
messageInterceptor = new ChromiumWidgetNativeWindow((Control)Browser, chromeWidgetHostHandle);
messageInterceptor.OnWndProc(message =>
{
const int WM_MOUSEACTIVATE = 0x0021;
const int WM_NCLBUTTONDOWN = 0x00A1;
const int WM_DESTROY = 0x0002;
// Render process switch happened, need to find the new handle
if (message.Msg == WM_DESTROY)
{
SetupMessageInterceptor();
return(false);
}
if (message.Msg == WM_MOUSEACTIVATE)
{
// The default processing of WM_MOUSEACTIVATE results in MA_NOACTIVATE,
// and the subsequent mouse click is eaten by Chrome.
// This means any .NET ToolStrip or ContextMenuStrip does not get closed.
// By posting a WM_NCLBUTTONDOWN message to a harmless co-ordinate of the
// top-level window, we rely on the ToolStripManager's message handling
// to close any open dropdowns:
// http://referencesource.microsoft.com/#System.Windows.Forms/winforms/Managed/System/WinForms/ToolStripManager.cs,1249
var topLevelWindowHandle = message.WParam;
PostMessage(topLevelWindowHandle, WM_NCLBUTTONDOWN, IntPtr.Zero, IntPtr.Zero);
}
//Forward mouse button down message to browser control
//else if(message.Msg == WM_LBUTTONDOWN)
//{
// PostMessage(browserHandle, WM_LBUTTONDOWN, message.WParam, message.LParam);
//}
// The ChromiumWebBrowserControl does not fire MouseEnter/Move/Leave events, because Chromium handles these.
// However we can hook into Chromium's messaging window to receive the events.
//
//const int WM_MOUSEMOVE = 0x0200;
//const int WM_MOUSELEAVE = 0x02A3;
//
//switch (message.Msg) {
// case WM_MOUSEMOVE:
// Console.WriteLine("WM_MOUSEMOVE");
// break;
// case WM_MOUSELEAVE:
// Console.WriteLine("WM_MOUSELEAVE");
// break;
//}
return(false);
});
break;
}
else
{
// Chrome hasn't yet set up its message-loop window.
await Task.Delay(10);
}
}
}
catch
{
// Errors are likely to occur if browser is disposed, and no good way to check from another thread
}
});
}
