Added a fix for #219, or so we hope. :) The thing is that we need to implement GetViewRect() and GetScreenRect() to force the popups to always be layouted inside the view; otherwise, we run into problems when the window is e.g. located close to the bottom screen border or similar.

Author: perlun

CefSharp/RenderClientAdapter.cpp

@@ -37,4 +37,22 @@ namespace CefSharp
     {
         _renderBrowserControl->SetCursor((IntPtr)cursor);
     }
+
+    bool RenderClientAdapter::GetViewRect(CefRefPtr<CefBrowser> browser, CefRect& rect)
+    {
+        // The simulated screen and view rectangle are the same. This is necessary for popup menus to be located and sized inside
+        // the view.
+        int width, height;
+        browser->GetSize(PET_VIEW, width, height);
+
+        rect.x = rect.y = 0;
+        rect.width = width;
+        rect.height = height;
+        return true;
+    }
+
+    bool RenderClientAdapter::GetScreenRect(CefRefPtr<CefBrowser> browser, CefRect& rect)
+    {
+        return GetViewRect(browser, rect);
+    }
 }

CefSharp/RenderClientAdapter.h

@@ -30,5 +30,7 @@ namespace CefSharp
         virtual DECL void OnPopupSize(CefRefPtr<CefBrowser> browser,const CefRect& rect) OVERRIDE;
         virtual DECL void OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList& dirtyRects, const void* buffer) OVERRIDE;
         virtual DECL void OnCursorChange(CefRefPtr<CefBrowser> browser, CefCursorHandle cursor) OVERRIDE;
+        virtual DECL bool GetViewRect(CefRefPtr<CefBrowser> browser, CefRect& rect) OVERRIDE;
+        virtual DECL bool GetScreenRect(CefRefPtr<CefBrowser> browser, CefRect& rect) OVERRIDE;
     };
 }