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POHandling WM_NCPAINT "breaks" DWM glass rendering on Vista/Aero
 

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  1. POHandling WM_NCPAINT "breaks" DWM glass rendering on Vista/Aero
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    <p>I am trying to make a window that alternates between having an Aero/Glass and a custom rendered frame (by handling <code>WM_NCPAINT</code>) based on a user setting. (Windows Vista).</p> <p><code>DwmComposition</code> is enabled. My app comes up with the glass frame, but as soon as I toggle the setting to trigger the custom <code>WM_NCPAINT</code> codepath then toggle back to use <code>DefWindowProc</code>'s <code>WM_NCPAINT</code> handling, the native frame is now perpetually stuck in the "Vista Basic" style - it's no longer translucent and the caption buttons look different to the normal Aero/Glass ones.</p> <p>I've tried just about every way of poking the window from sending <code>SWP_FRAMECHANGED</code> to changing the window style then changing it back, hiding it, etc, but all to no avail. It seems like as soon as I handle <code>WM_NCPAINT</code> for a glass window rather than deferring to <code>DefWindowProc</code> my window is forever "broken".</p> <p>I found a C#/WPF example on MSDN (code dot msdn dot microsoft dot com slash chrome ) that seemed to indicate that one simply needed to stop handling WM_NCPAINT and the glass would return, but that does not seem to work in my own app.</p> <p>Is there a way to reset this state cleanly? My code is in C++ and lives here:</p> <p><a href="http://bengoodger.dreamhosters.com/software/chrome/dwm/" rel="noreferrer">http://bengoodger.dreamhosters.com/software/chrome/dwm/</a></p> <pre><code>#include &lt;windows.h&gt; #include &lt;dwmapi.h&gt; static const wchar_t* kWindowClass = L"BrokenGlassWindow"; static const wchar_t* kWindowTitle = L"BrokenGlass - Right click client area to toggle frame type."; static const int kGlassBorderSize = 50; static const int kNonGlassBorderSize = 40; static bool g_glass = true; bool IsGlass() { BOOL composition_enabled = FALSE; return DwmIsCompositionEnabled(&amp;composition_enabled) == S_OK &amp;&amp; composition_enabled &amp;&amp; g_glass; } void SetIsGlass(bool is_glass) { g_glass = is_glass; } void ToggleGlass(HWND hwnd) { SetWindowPos(hwnd, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_FRAMECHANGED); RedrawWindow(hwnd, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW); } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM w_param, LPARAM l_param) { PAINTSTRUCT ps; HDC hdc; RECT wr; HBRUSH br; RECT* nccr = NULL; RECT dirty; RECT dirty_box; MARGINS dwmm = {0}; WINDOWPOS* wp = NULL; switch (message) { case WM_CREATE: SetCursor(LoadCursor(NULL, IDC_ARROW)); break; case WM_ERASEBKGND: return 1; case WM_PAINT: hdc = BeginPaint(hwnd, &amp;ps); GetClientRect(hwnd, &amp;wr); br = GetSysColorBrush(IsGlass() ? COLOR_APPWORKSPACE : COLOR_WINDOW); FillRect(hdc, &amp;wr, br); EndPaint(hwnd, &amp;ps); break; case WM_NCPAINT: if (IsGlass()) return DefWindowProc(hwnd, message, w_param, l_param); GetWindowRect(hwnd, &amp;wr); if (!w_param|| w_param == 1) { dirty = wr; dirty.left = dirty.top = 0; } else { GetRgnBox(reinterpret_cast&lt;HRGN&gt;(w_param), &amp;dirty_box); if (!IntersectRect(&amp;dirty, &amp;dirty_box, &amp;wr)) return 0; OffsetRect(&amp;dirty, -wr.left, -wr.top); } hdc = GetWindowDC(hwnd); br = CreateSolidBrush(RGB(255,0,0)); FillRect(hdc, &amp;dirty, br); DeleteObject(br); ReleaseDC(hwnd, hdc); break; case WM_NCACTIVATE: // Force paint our non-client area otherwise Windows will paint its own. RedrawWindow(hwnd, NULL, NULL, RDW_UPDATENOW); break; case WM_NCCALCSIZE: nccr = w_param ? &amp;reinterpret_cast&lt;NCCALCSIZE_PARAMS*&gt;(l_param)-&gt;rgrc[0] : reinterpret_cast&lt;RECT*&gt;(l_param); nccr-&gt;bottom -= IsGlass() ? kGlassBorderSize : kNonGlassBorderSize; nccr-&gt;right -= IsGlass() ? kGlassBorderSize : kNonGlassBorderSize; nccr-&gt;left += IsGlass() ? kGlassBorderSize : kNonGlassBorderSize; nccr-&gt;top += IsGlass() ? kGlassBorderSize : kNonGlassBorderSize; return WVR_REDRAW; case WM_RBUTTONDOWN: SetIsGlass(!g_glass); ToggleGlass(hwnd); break; case 0x31E: // WM_DWMCOMPOSITIONCHANGED: ToggleGlass(hwnd); break; case 0xAE: // WM_NCUAHDRAWCAPTION: case 0xAF: // WM_NCUAHDRAWFRAME: return IsGlass() ? DefWindowProc(hwnd, message, w_param, l_param) : 0; case WM_WINDOWPOSCHANGED: dwmm.cxLeftWidth = kGlassBorderSize; dwmm.cxRightWidth = kGlassBorderSize; dwmm.cyTopHeight = kGlassBorderSize; dwmm.cyBottomHeight = kGlassBorderSize; DwmExtendFrameIntoClientArea(hwnd, &amp;dwmm); break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hwnd, message, w_param, l_param); } return 0; } ATOM RegisterClazz(HINSTANCE instance) { WNDCLASSEX wcex = {0}; wcex.cbSize = sizeof(wcex); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.hInstance = instance; wcex.lpszClassName = kWindowClass; return RegisterClassEx(&amp;wcex); } int WINAPI WinMain(HINSTANCE instance, HINSTANCE, LPSTR, int show_command) { RegisterClazz(instance); HWND hwnd = CreateWindow(kWindowClass, kWindowTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, instance, NULL); ShowWindow(hwnd, show_command); MSG msg; while (GetMessage(&amp;msg, NULL, 0, 0)) { TranslateMessage(&amp;msg); DispatchMessage(&amp;msg); } return static_cast&lt;int&gt;(msg.wParam); } </code></pre>
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