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POWPF HwndHost keyboard focus
 

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    <p>The chart area in the screenshot is a HwndHost control which hosts a native Win32 window (with it's own registered WNDCLASS) implemented in C++/CLI and drawn with Direct2D. The HwndHost is hosted in a WPF Border control.</p> <p>The problem I have is that I can't set the keyboard focus to the hosted Win32 window. I want the focus to move to the hosted Win32 window when the used clicks on the chart area. I tried calling SetFocus on WM_LBUTTONDOWN, but that screws up the focus in the rest of the application.</p> <p>Currently, even if I click on the Win32 window, the focus remains on the tree-view on the left, and if I press the up/down cursor keys, the tree-view will get them, not the chart window.</p> <p>How do I make the hosted Win32 window receive keyboard input from when the user clicks on the chart area, until it clicks on another control (like the tree-view, or the toolbar)?</p> <p><a href="http://dl.dropbox.com/u/190212/public/wpf_hwndhost.png" rel="nofollow noreferrer">alt text http://dl.dropbox.com/u/190212/public/wpf_hwndhost.png</a></p> <p>EDIT: Here's the C++/CLI code for the window host:</p> <pre><code>template &lt;typename T&gt; inline T intPtrToPtr(IntPtr value) { return reinterpret_cast&lt;T&gt;(static_cast&lt;void*&gt;(value)); } public ref class ChartWindowHost : public HwndHost, IKeyboardInputSink { private: ChartWindow* chartWindow; // this is a C++ class doing the actual work protected: virtual HandleRef BuildWindowCore(HandleRef parent) override { chartWindow = new ChartWindow; const HINSTANCE hInstance = intPtrToPtr&lt;HINSTANCE&gt;(Marshal::GetHINSTANCE(Assembly::GetExecutingAssembly()-&gt;GetModules()[0])); const HWND parentWindow = intPtrToPtr&lt;HWND&gt;(parent.Handle); chartWindow-&gt;Create(hInstance, parentWindow); return HandleRef(this, IntPtr(chartWindow-&gt;GetHandle())); } virtual void DestroyWindowCore(HandleRef /*window*/) override { chartWindow-&gt;Destroy(); delete chartWindow; chartWindow = NULL; } }; </code></pre>
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