处理 WM_NCPAINT “中断"Vista/Aero 上的 DWM 玻璃渲染 [英] Handling WM_NCPAINT "breaks" DWM glass rendering on Vista/Aero

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本文介绍了处理 WM_NCPAINT “中断"Vista/Aero 上的 DWM 玻璃渲染的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在尝试根据用户设置制作一个在具有 Aero/Glass 和自定义渲染框架(通过处理 WM_NCPAINT)之间交替的窗口.(Windows Vista).

I am trying to make a window that alternates between having an Aero/Glass and a custom rendered frame (by handling WM_NCPAINT) based on a user setting. (Windows Vista).

DwmComposition 已启用.我的应用程序带有玻璃框架,但是一旦我切换设置以触发自定义 WM_NCPAINT 代码路径,然后切换回使用 DefWindowProcWM_NCPAINT 处理,本机框架现在永久停留在Vista Basic"样式 - 它不再是半透明的,并且标题按钮看起来与普通的 Aero/Glass 按钮不同.

DwmComposition is enabled. My app comes up with the glass frame, but as soon as I toggle the setting to trigger the custom WM_NCPAINT codepath then toggle back to use DefWindowProc's WM_NCPAINT 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.

我尝试了从发送 SWP_FRAMECHANGED 到更改窗口样式然后将其改回、隐藏等几乎所有戳窗口的方法,但都无济于事.似乎只要我为玻璃窗口处理 WM_NCPAINT 而不是推迟到 DefWindowProc 我的窗口就永远坏了".

I've tried just about every way of poking the window from sending SWP_FRAMECHANGED 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 WM_NCPAINT for a glass window rather than deferring to DefWindowProc my window is forever "broken".

我在 MSDN 上发现了一个 C#/WPF 示例(代码 dot msdn dot microsoft dot com slash chrome ),它似乎表明一个人只需要停止处理 WM_NCPAINT 并且玻璃会返回,但这似乎在我的自己的应用.

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.

有没有办法干净地重置这个状态?我的代码是用 C++ 编写的,在这里:

Is there a way to reset this state cleanly? My code is in C++ and lives here:

http://bengoodger.dreamhosters.com/software/chrome/dwm/

#include <windows.h>
#include <dwmapi.h>

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(&composition_enabled) == S_OK &&
      composition_enabled && 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, &ps);
      GetClientRect(hwnd, &wr);
      br = GetSysColorBrush(IsGlass() ? COLOR_APPWORKSPACE : COLOR_WINDOW);
      FillRect(hdc, &wr, br);
      EndPaint(hwnd, &ps);
      break;
    case WM_NCPAINT:
      if (IsGlass())
        return DefWindowProc(hwnd, message, w_param, l_param);
      GetWindowRect(hwnd, &wr);
      if (!w_param|| w_param == 1) {
        dirty = wr;
        dirty.left = dirty.top = 0;
      } else {
        GetRgnBox(reinterpret_cast<HRGN>(w_param), &dirty_box);
        if (!IntersectRect(&dirty, &dirty_box, &wr))
          return 0;
        OffsetRect(&dirty, -wr.left, -wr.top);
      }
      hdc = GetWindowDC(hwnd);
      br = CreateSolidBrush(RGB(255,0,0));
      FillRect(hdc, &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 ? &reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0]
                     : reinterpret_cast<RECT*>(l_param);
      nccr->bottom -= IsGlass() ? kGlassBorderSize : kNonGlassBorderSize;
      nccr->right -= IsGlass() ? kGlassBorderSize : kNonGlassBorderSize;
      nccr->left += IsGlass() ? kGlassBorderSize : kNonGlassBorderSize;
      nccr->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, &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(&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(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return static_cast<int>(msg.wParam);
}

推荐答案

当在 Aero/Glass 和自定义渲染框架之间切换时,您可以使用以下内容显式控制非客户区渲染策略:

When toggling between Aero/Glass and your custom rendered frame it you can use the following to explicitly control the non-client area rendering policy:

DWMNCRENDERINGPOLICY policy = DWMNCRP_ENABLED; // DWMNCRP_DISABLED to toggle back
DwmSetWindowAttribute(hwnd, 
                      DWMWA_NCRENDERING_POLICY, 
                      (void*)&policy, 
                      sizeof(DWMNCRENDERINGPOLICY));

这篇关于处理 WM_NCPAINT “中断"Vista/Aero 上的 DWM 玻璃渲染的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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